diff --git a/tests/GrMeshTest.cpp b/tests/GrMeshTest.cpp
index 0f4dcb6..d174675 100644
--- a/tests/GrMeshTest.cpp
+++ b/tests/GrMeshTest.cpp
@@ -327,20 +327,20 @@
 
         GrGLSLVertexBuilder* v = args.fVertBuilder;
         if (!mp.fInstanceLocation) {
-            v->codeAppendf("float2 vertex = %s;", mp.fVertex->fName);
+            v->codeAppendf("highfloat2 vertex = %s;", mp.fVertex->fName);
         } else {
             if (mp.fVertex) {
-                v->codeAppendf("float2 offset = %s;", mp.fVertex->fName);
+                v->codeAppendf("highfloat2 offset = %s;", mp.fVertex->fName);
             } else {
-                v->codeAppend ("float2 offset = float2(sk_VertexID / 2, sk_VertexID % 2);");
+                v->codeAppend ("highfloat2 offset = highfloat2(sk_VertexID / 2, sk_VertexID % 2);");
             }
-            v->codeAppendf("float2 vertex = %s + offset * %i;",
+            v->codeAppendf("highfloat2 vertex = %s + offset * %i;",
                            mp.fInstanceLocation->fName, kBoxSize);
         }
-        gpArgs->fPositionVar.set(kVec2f_GrSLType, "vertex");
+        gpArgs->fPositionVar.set(kHighFloat2_GrSLType, "vertex");
 
         GrGLSLPPFragmentBuilder* f = args.fFragBuilder;
-        f->codeAppendf("%s = float4(1);", args.fOutputCoverage);
+        f->codeAppendf("%s = half4(1);", args.fOutputCoverage);
     }
 };
 
diff --git a/tests/GrPipelineDynamicStateTest.cpp b/tests/GrPipelineDynamicStateTest.cpp
index 76d90dd..1f3dccd 100644
--- a/tests/GrPipelineDynamicStateTest.cpp
+++ b/tests/GrPipelineDynamicStateTest.cpp
@@ -91,11 +91,11 @@
         varyingHandler->addPassThroughAttribute(&mp.fColor, args.fOutputColor);
 
         GrGLSLVertexBuilder* v = args.fVertBuilder;
-        v->codeAppendf("float2 vertex = %s;", mp.fVertex.fName);
-        gpArgs->fPositionVar.set(kVec2f_GrSLType, "vertex");
+        v->codeAppendf("highfloat2 vertex = %s;", mp.fVertex.fName);
+        gpArgs->fPositionVar.set(kHighFloat2_GrSLType, "vertex");
 
         GrGLSLPPFragmentBuilder* f = args.fFragBuilder;
-        f->codeAppendf("%s = float4(1);", args.fOutputCoverage);
+        f->codeAppendf("%s = half4(1);", args.fOutputCoverage);
     }
 };
 
diff --git a/tests/ImageStorageTest.cpp b/tests/ImageStorageTest.cpp
index 6d5cab0..8a6023f 100644
--- a/tests/ImageStorageTest.cpp
+++ b/tests/ImageStorageTest.cpp
@@ -58,13 +58,13 @@
                     const TestFP& tfp = args.fFp.cast<TestFP>();
                     GrGLSLFPFragmentBuilder* fb = args.fFragBuilder;
                     SkString imageLoadStr;
-                    fb->codeAppend("highp float2 coord = sk_FragCoord.xy;");
+                    fb->codeAppend("highfloat2 coord = sk_FragCoord.xy;");
                     fb->appendImageStorageLoad(&imageLoadStr, args.fImageStorages[0],
                                                "int2(coord)");
                     if (GrPixelConfigIsSint(tfp.fImageStorageAccess.peekTexture()->config())) {
                         // Map the signed bytes so that when then get read back as unorm values they
                         // will have their original bit pattern.
-                        fb->codeAppendf("highp int4 ivals = %s;", imageLoadStr.c_str());
+                        fb->codeAppendf("int4 ivals = %s;", imageLoadStr.c_str());
                         // NV gives a linker error for this:
                         // fb->codeAppend("ivals +=
                         //                "mix(int4(0), int4(256), lessThan(ivals, int4(0)));");
@@ -72,7 +72,7 @@
                         fb->codeAppend("if (ivals.g < 0) { ivals.g += 256; }");
                         fb->codeAppend("if (ivals.b < 0) { ivals.b += 256; }");
                         fb->codeAppend("if (ivals.a < 0) { ivals.a += 256; }");
-                        fb->codeAppendf("%s = float4(ivals)/255;", args.fOutputColor);
+                        fb->codeAppendf("%s = half4(ivals)/255;", args.fOutputColor);
                     } else {
                         fb->codeAppendf("%s = %s;", args.fOutputColor, imageLoadStr.c_str());
                     }
diff --git a/tests/PrimitiveProcessorTest.cpp b/tests/PrimitiveProcessorTest.cpp
index 1e764e1..47dff33 100644
--- a/tests/PrimitiveProcessorTest.cpp
+++ b/tests/PrimitiveProcessorTest.cpp
@@ -72,8 +72,8 @@
                         args.fVaryingHandler->emitAttributes(gp);
                         this->writeOutputPosition(args.fVertBuilder, gpArgs, gp.getAttrib(0).fName);
                         GrGLSLPPFragmentBuilder* fragBuilder = args.fFragBuilder;
-                        fragBuilder->codeAppendf("%s = float4(1);", args.fOutputColor);
-                        fragBuilder->codeAppendf("%s = float4(1);", args.fOutputCoverage);
+                        fragBuilder->codeAppendf("%s = half4(1);", args.fOutputColor);
+                        fragBuilder->codeAppendf("%s = half4(1);", args.fOutputCoverage);
                     }
                     void setData(const GrGLSLProgramDataManager& pdman,
                                  const GrPrimitiveProcessor& primProc,
diff --git a/tests/SkSLErrorTest.cpp b/tests/SkSLErrorTest.cpp
index b94cc82..4943e10 100644
--- a/tests/SkSLErrorTest.cpp
+++ b/tests/SkSLErrorTest.cpp
@@ -37,39 +37,39 @@
 
 DEF_TEST(SkSLUndefinedSymbol, r) {
     test_failure(r,
-                 "void main() { x = float2(1); }",
+                 "void main() { x = highfloat2(1); }",
                  "error: 1: unknown identifier 'x'\n1 error\n");
 }
 
 DEF_TEST(SkSLUndefinedFunction, r) {
     test_failure(r,
-                 "void main() { int x = foo(1); }", 
+                 "void main() { int x = foo(1); }",
                  "error: 1: unknown identifier 'foo'\n1 error\n");
 }
 
 DEF_TEST(SkSLGenericArgumentMismatch, r) {
     test_failure(r,
-                 "void main() { float x = sin(1, 2); }", 
+                 "void main() { highfloat x = sin(1, 2); }",
                  "error: 1: call to 'sin' expected 1 argument, but found 2\n1 error\n");
     test_failure(r,
-                 "void main() { float x = sin(true); }", 
+                 "void main() { highfloat x = sin(true); }",
                  "error: 1: no match for sin(bool)\n1 error\n");
     test_success(r,
-                 "void main() { float x = sin(1); }");
+                 "void main() { highfloat x = sin(1); }");
 }
 
 DEF_TEST(SkSLArgumentCountMismatch, r) {
     test_failure(r,
-                 "float foo(float x) { return x * x; }"
-                 "void main() { float x = foo(1, 2); }", 
+                 "highfloat foo(highfloat x) { return x * x; }"
+                 "void main() { highfloat x = foo(1, 2); }",
                  "error: 1: call to 'foo' expected 1 argument, but found 2\n1 error\n");
 }
 
 DEF_TEST(SkSLArgumentMismatch, r) {
-    test_failure(r, 
-                 "float foo(float x) { return x * x; }"
-                 "void main() { float x = foo(true); }", 
-                 "error: 1: expected 'float', but found 'bool'\n1 error\n");
+    test_failure(r,
+                 "highfloat foo(highfloat x) { return x * x; }"
+                 "void main() { highfloat x = foo(true); }",
+                 "error: 1: expected 'highfloat', but found 'bool'\n1 error\n");
 }
 
 DEF_TEST(SkSLIfTypeMismatch, r) {
@@ -80,32 +80,32 @@
 
 DEF_TEST(SkSLDoTypeMismatch, r) {
     test_failure(r,
-                 "void main() { do { } while (float2(1)); }",
-                 "error: 1: expected 'bool', but found 'float2'\n1 error\n");
+                 "void main() { do { } while (highfloat2(1)); }",
+                 "error: 1: expected 'bool', but found 'highfloat2'\n1 error\n");
 }
 
 DEF_TEST(SkSLWhileTypeMismatch, r) {
     test_failure(r,
-                 "void main() { while (float3(1)) { } }",
-                 "error: 1: expected 'bool', but found 'float3'\n1 error\n");
+                 "void main() { while (highfloat3(1)) { } }",
+                 "error: 1: expected 'bool', but found 'highfloat3'\n1 error\n");
 }
 
 DEF_TEST(SkSLForTypeMismatch, r) {
     test_failure(r,
-                 "void main() { for (int x = 0; x; x++) { } }", 
+                 "void main() { for (int x = 0; x; x++) { } }",
                  "error: 1: expected 'bool', but found 'int'\n1 error\n");
 }
 
 DEF_TEST(SkSLConstructorTypeMismatch, r) {
     test_failure(r,
-                 "void main() { float2 x = float2(1.0, false); }", 
-                 "error: 1: expected 'float', but found 'bool'\n1 error\n");
+                 "void main() { highfloat2 x = highfloat2(1.0, false); }",
+                 "error: 1: expected 'highfloat', but found 'bool'\n1 error\n");
     test_failure(r,
-                 "void main() { float2 x = float2(bool2(false)); }",
-                 "error: 1: 'bool2' is not a valid parameter to 'float2' constructor\n1 error\n");
+                 "void main() { highfloat2 x = highfloat2(bool2(false)); }",
+                 "error: 1: 'bool2' is not a valid parameter to 'highfloat2' constructor\n1 error\n");
     test_failure(r,
-                 "void main() { bool2 x = bool2(float2(1)); }",
-                 "error: 1: 'float2' is not a valid parameter to 'bool2' constructor\n1 error\n");
+                 "void main() { bool2 x = bool2(highfloat2(1)); }",
+                 "error: 1: 'highfloat2' is not a valid parameter to 'bool2' constructor\n1 error\n");
     test_failure(r,
                  "void main() { bool x = bool(1.0); }",
                  "error: 1: cannot construct 'bool'\n1 error\n");
@@ -113,69 +113,69 @@
                  "struct foo { int x; }; void main() { foo x = foo(5); }",
                  "error: 1: cannot construct 'foo'\n1 error\n");
     test_failure(r,
-                 "struct foo { int x; } foo; void main() { float x = float(foo); }",
-                 "error: 1: invalid argument to 'float' constructor (expected a number or bool, but found 'foo')\n1 error\n");
+                 "struct foo { int x; } foo; void main() { highfloat x = highfloat(foo); }",
+                 "error: 1: invalid argument to 'highfloat' constructor (expected a number or bool, but found 'foo')\n1 error\n");
     test_failure(r,
-                 "struct foo { int x; } foo; void main() { float2 x = float2(foo); }",
-                 "error: 1: 'foo' is not a valid parameter to 'float2' constructor\n1 error\n");
+                 "struct foo { int x; } foo; void main() { highfloat2 x = highfloat2(foo); }",
+                 "error: 1: 'foo' is not a valid parameter to 'highfloat2' constructor\n1 error\n");
     test_failure(r,
-                 "void main() { float2x2 x = float2x2(true); }",
-                 "error: 1: expected 'float', but found 'bool'\n1 error\n");
+                 "void main() { highfloat2x2 x = highfloat2x2(true); }",
+                 "error: 1: expected 'highfloat', but found 'bool'\n1 error\n");
 }
 
 DEF_TEST(SkSLConstructorArgumentCount, r) {
     test_failure(r,
-                 "void main() { float3 x = float3(1.0, 2.0); }",
-                 "error: 1: invalid arguments to 'float3' constructor (expected 3 scalars, but "
+                 "void main() { highfloat3 x = highfloat3(1.0, 2.0); }",
+                 "error: 1: invalid arguments to 'highfloat3' constructor (expected 3 scalars, but "
                  "found 2)\n1 error\n");
     test_failure(r,
-                 "void main() { float3 x = float3(1.0, 2.0, 3.0, 4.0); }",
-                 "error: 1: invalid arguments to 'float3' constructor (expected 3 scalars, but found "
+                 "void main() { highfloat3 x = highfloat3(1.0, 2.0, 3.0, 4.0); }",
+                 "error: 1: invalid arguments to 'highfloat3' constructor (expected 3 scalars, but found "
                  "4)\n1 error\n");
 }
 
 DEF_TEST(SkSLSwizzleScalar, r) {
     test_failure(r,
-                 "void main() { float x = 1; float y = x.y; }",
-                 "error: 1: cannot swizzle value of type 'float'\n1 error\n");
+                 "void main() { highfloat x = 1; highfloat y = x.y; }",
+                 "error: 1: cannot swizzle value of type 'highfloat'\n1 error\n");
 }
 
 DEF_TEST(SkSLSwizzleMatrix, r) {
     test_failure(r,
-                 "void main() { float2x2 x = float2x2(1); float y = x.y; }",
-                 "error: 1: cannot swizzle value of type 'float2x2'\n1 error\n");
+                 "void main() { highfloat2x2 x = highfloat2x2(1); highfloat y = x.y; }",
+                 "error: 1: cannot swizzle value of type 'highfloat2x2'\n1 error\n");
 }
 
 DEF_TEST(SkSLSwizzleOutOfBounds, r) {
     test_failure(r,
-                 "void main() { float3 test = float2(1).xyz; }",
+                 "void main() { highfloat3 test = highfloat2(1).xyz; }",
                  "error: 1: invalid swizzle component 'z'\n1 error\n");
 }
 
 DEF_TEST(SkSLSwizzleTooManyComponents, r) {
     test_failure(r,
-                 "void main() { float4 test = float2(1).xxxxx; }",
+                 "void main() { highfloat4 test = highfloat2(1).xxxxx; }",
                  "error: 1: too many components in swizzle mask 'xxxxx'\n1 error\n");
 }
 
 DEF_TEST(SkSLSwizzleDuplicateOutput, r) {
     test_failure(r,
-                 "void main() { float4 test = float4(1); test.xyyz = float4(1); }",
+                 "void main() { highfloat4 test = highfloat4(1); test.xyyz = highfloat4(1); }",
                  "error: 1: cannot write to the same swizzle field more than once\n1 error\n");
 }
 
 DEF_TEST(SkSLAssignmentTypeMismatch, r) {
     test_failure(r,
                  "void main() { int x = 1.0; }",
-                 "error: 1: expected 'int', but found 'float'\n1 error\n");
+                 "error: 1: expected 'int', but found 'highfloat'\n1 error\n");
     test_failure(r,
                  "void main() { int x; x = 1.0; }",
-                 "error: 1: type mismatch: '=' cannot operate on 'int', 'float'\n1 error\n");
+                 "error: 1: type mismatch: '=' cannot operate on 'int', 'highfloat'\n1 error\n");
     test_success(r,
-                 "void main() { float3 x = float3(0); x *= 1.0; }");
+                 "void main() { highfloat3 x = highfloat3(0); x *= 1.0; }");
     test_failure(r,
                  "void main() { int3 x = int3(0); x *= 1.0; }",
-                 "error: 1: type mismatch: '*=' cannot operate on 'int3', 'float'\n1 error\n");
+                 "error: 1: type mismatch: '*=' cannot operate on 'int3', 'highfloat'\n1 error\n");
 }
 
 DEF_TEST(SkSLReturnFromVoid, r) {
@@ -192,13 +192,13 @@
 
 DEF_TEST(SkSLReturnTypeMismatch, r) {
     test_failure(r,
-                 "int foo() { return 1.0; } void main() { }", 
-                 "error: 1: expected 'int', but found 'float'\n1 error\n");
+                 "int foo() { return 1.0; } void main() { }",
+                 "error: 1: expected 'int', but found 'highfloat'\n1 error\n");
 }
 
 DEF_TEST(SkSLDuplicateFunction, r) {
     test_failure(r,
-                 "void main() { } void main() { }", 
+                 "void main() { } void main() { }",
                  "error: 1: duplicate definition of void main()\n1 error\n");
     test_success(r,
                  "void main(); void main() { }");
@@ -206,29 +206,29 @@
 
 DEF_TEST(SkSLUsingInvalidValue, r) {
     test_failure(r,
-                 "void main() { int x = int; }", 
+                 "void main() { int x = int; }",
                  "error: 1: expected '(' to begin constructor invocation\n1 error\n");
     test_failure(r,
-                 "int test() { return 1; } void main() { int x = test; }", 
+                 "int test() { return 1; } void main() { int x = test; }",
                  "error: 1: expected '(' to begin function call\n1 error\n");
 }
 DEF_TEST(SkSLDifferentReturnType, r) {
     test_failure(r,
-                 "int main() { return 1; } void main() { }", 
+                 "int main() { return 1; } void main() { }",
                  "error: 1: functions 'void main()' and 'int main()' differ only in return type\n1 "
                  "error\n");
 }
 
 DEF_TEST(SkSLDifferentModifiers, r) {
     test_failure(r,
-                 "void test(int x); void test(out int x) { }", 
+                 "void test(int x); void test(out int x) { }",
                  "error: 1: modifiers on parameter 1 differ between declaration and definition\n1 "
                  "error\n");
 }
 
 DEF_TEST(SkSLDuplicateSymbol, r) {
     test_failure(r,
-                 "int main; void main() { }", 
+                 "int main; void main() { }",
                  "error: 1: symbol 'main' was already defined\n1 error\n");
 
     test_failure(r,
@@ -240,32 +240,32 @@
 
 DEF_TEST(SkSLBinaryTypeMismatch, r) {
     test_failure(r,
-                 "void main() { float x = 3 * true; }",
+                 "void main() { highfloat x = 3 * true; }",
                  "error: 1: type mismatch: '*' cannot operate on 'int', 'bool'\n1 error\n");
     test_failure(r,
                  "void main() { bool x = 1 || 2.0; }",
-                 "error: 1: type mismatch: '||' cannot operate on 'int', 'float'\n1 error\n");
+                 "error: 1: type mismatch: '||' cannot operate on 'int', 'highfloat'\n1 error\n");
 }
 
 DEF_TEST(SkSLCallNonFunction, r) {
     test_failure(r,
-                 "void main() { float x = 3; x(); }",
+                 "void main() { highfloat x = 3; x(); }",
                  "error: 1: 'x' is not a function\n1 error\n");
 }
 
 DEF_TEST(SkSLInvalidUnary, r) {
     test_failure(r,
-                 "void main() { float4x4 x = float4x4(1); ++x; }",
-                 "error: 1: '++' cannot operate on 'float4x4'\n1 error\n");
+                 "void main() { highfloat4x4 x = highfloat4x4(1); ++x; }",
+                 "error: 1: '++' cannot operate on 'highfloat4x4'\n1 error\n");
     test_failure(r,
-                 "void main() { float3 x = float3(1); --x; }",
-                 "error: 1: '--' cannot operate on 'float3'\n1 error\n");
+                 "void main() { highfloat3 x = highfloat3(1); --x; }",
+                 "error: 1: '--' cannot operate on 'highfloat3'\n1 error\n");
     test_failure(r,
-                 "void main() { float4x4 x = float4x4(1); x++; }",
-                 "error: 1: '++' cannot operate on 'float4x4'\n1 error\n");
+                 "void main() { highfloat4x4 x = highfloat4x4(1); x++; }",
+                 "error: 1: '++' cannot operate on 'highfloat4x4'\n1 error\n");
     test_failure(r,
-                 "void main() { float3 x = float3(1); x--; }",
-                 "error: 1: '--' cannot operate on 'float3'\n1 error\n");
+                 "void main() { highfloat3 x = highfloat3(1); x--; }",
+                 "error: 1: '--' cannot operate on 'highfloat3'\n1 error\n");
     test_failure(r,
                  "void main() { int x = !12; }",
                  "error: 1: '!' cannot operate on 'int'\n1 error\n");
@@ -276,7 +276,7 @@
                  "struct foo { } bar; void main() { foo x = -bar; }",
                  "error: 1: '-' cannot operate on 'foo'\n1 error\n");
     test_success(r,
-                 "void main() { float2 x = float2(1, 1); x = +x; x = -x; }");
+                 "void main() { highfloat2 x = highfloat2(1, 1); x = +x; x = -x; }");
 }
 
 DEF_TEST(SkSLInvalidAssignment, r) {
@@ -296,17 +296,17 @@
                  "void main() { int x = 2[0]; }",
                  "error: 1: expected array, but found 'int'\n1 error\n");
     test_failure(r,
-                 "void main() { float2 x = float2(0); int y = x[0][0]; }",
-                 "error: 1: expected array, but found 'float'\n1 error\n");
+                 "void main() { highfloat2 x = highfloat2(0); int y = x[0][0]; }",
+                 "error: 1: expected array, but found 'highfloat'\n1 error\n");
 }
 
 DEF_TEST(SkSLTernaryMismatch, r) {
     test_failure(r,
                  "void main() { int x = 5 > 2 ? true : 1.0; }",
-                 "error: 1: ternary operator result mismatch: 'bool', 'float'\n1 error\n");
+                 "error: 1: ternary operator result mismatch: 'bool', 'highfloat'\n1 error\n");
     test_failure(r,
-                 "void main() { int x = 5 > 2 ? float3(1) : 1.0; }",
-                 "error: 1: ternary operator result mismatch: 'float3', 'float'\n1 error\n");
+                 "void main() { int x = 5 > 2 ? highfloat3(1) : 1.0; }",
+                 "error: 1: ternary operator result mismatch: 'highfloat3', 'highfloat'\n1 error\n");
 }
 
 DEF_TEST(SkSLInterfaceBlockStorageModifiers, r) {
@@ -333,7 +333,7 @@
                  "error: 1: 'x' has not been assigned\n1 error\n");
     test_failure(r,
                  "void main() { int x; switch (3) { case 0: x = 0; case 1: x = 1; }"
-                               "sk_FragColor = float4(x); }",
+                               "sk_FragColor = highfloat4(x); }",
                  "error: 1: 'x' has not been assigned\n1 error\n");
 }
 
@@ -403,32 +403,32 @@
                  "int x = 1 / 0;",
                  "error: 1: division by zero\n1 error\n");
     test_failure(r,
-                 "float x = 1 / 0;",
+                 "highfloat x = 1 / 0;",
                  "error: 1: division by zero\n1 error\n");
     test_failure(r,
-                 "float x = 1.0 / 0.0;",
+                 "highfloat x = 1.0 / 0.0;",
                  "error: 1: division by zero\n1 error\n");
     test_failure(r,
-                 "float x = -67.0 / (3.0 - 3);",
+                 "highfloat x = -67.0 / (3.0 - 3);",
                  "error: 1: division by zero\n1 error\n");
 }
 
 DEF_TEST(SkSLUnsupportedGLSLIdentifiers, r) {
     test_failure(r,
-                 "void main() { float x = gl_FragCoord.x; };",
+                 "void main() { highfloat x = gl_FragCoord.x; };",
                  "error: 1: unknown identifier 'gl_FragCoord'\n1 error\n");
     test_failure(r,
-                 "void main() { float r = gl_FragColor.r; };",
+                 "void main() { highfloat r = gl_FragColor.r; };",
                  "error: 1: unknown identifier 'gl_FragColor'\n1 error\n");
 }
 
 DEF_TEST(SkSLWrongSwitchTypes, r) {
     test_failure(r,
-                 "void main() { switch (float2(1)) { case 1: break; } }",
-                 "error: 1: expected 'int', but found 'float2'\n1 error\n");
+                 "void main() { switch (highfloat2(1)) { case 1: break; } }",
+                 "error: 1: expected 'int', but found 'highfloat2'\n1 error\n");
     test_failure(r,
-                 "void main() { switch (1) { case float2(1): break; } }",
-                 "error: 1: expected 'int', but found 'float2'\n1 error\n");
+                 "void main() { switch (1) { case highfloat2(1): break; } }",
+                 "error: 1: expected 'int', but found 'highfloat2'\n1 error\n");
 }
 
 DEF_TEST(SkSLNonConstantCase, r) {
@@ -445,18 +445,18 @@
 
 DEF_TEST(SkSLFieldAfterRuntimeArray, r) {
     test_failure(r,
-                 "buffer broken { float x[]; float y; };",
+                 "buffer broken { highfloat x[]; highfloat y; };",
                  "error: 1: only the last entry in an interface block may be a runtime-sized "
                  "array\n1 error\n");
 }
 
 DEF_TEST(SkSLStaticIf, r) {
     test_success(r,
-                 "void main() { float x = 5; float y = 10;"
-                 "@if (x < y) { sk_FragColor = float4(1); } }");
+                 "void main() { highfloat x = 5; highfloat y = 10;"
+                 "@if (x < y) { sk_FragColor = highfloat4(1); } }");
     test_failure(r,
-                 "void main() { float x = sqrt(25); float y = 10;"
-                 "@if (x < y) { sk_FragColor = float4(1); } }",
+                 "void main() { highfloat x = sqrt(25); highfloat y = 10;"
+                 "@if (x < y) { sk_FragColor = highfloat4(1); } }",
                  "error: 1: static if has non-static test\n1 error\n");
 }
 
@@ -465,16 +465,16 @@
                  "void main() {"
                  "int x = 1;"
                  "@switch (x) {"
-                 "case 1: sk_FragColor = float4(1); break;"
-                 "default: sk_FragColor = float4(0);"
+                 "case 1: sk_FragColor = highfloat4(1); break;"
+                 "default: sk_FragColor = highfloat4(0);"
                  "}"
                  "}");
     test_failure(r,
                  "void main() {"
                  "int x = int(sqrt(1));"
                  "@switch (x) {"
-                 "case 1: sk_FragColor = float4(1); break;"
-                 "default: sk_FragColor = float4(0);"
+                 "case 1: sk_FragColor = highfloat4(1); break;"
+                 "default: sk_FragColor = highfloat4(0);"
                  "}"
                  "}",
                  "error: 1: static switch has non-static test\n1 error\n");
@@ -482,8 +482,8 @@
                  "void main() {"
                  "int x = 1;"
                  "@switch (x) {"
-                 "case 1: sk_FragColor = float4(1); if (sqrt(0) < sqrt(1)) break;"
-                 "default: sk_FragColor = float4(0);"
+                 "case 1: sk_FragColor = highfloat4(1); if (sqrt(0) < sqrt(1)) break;"
+                 "default: sk_FragColor = highfloat4(0);"
                  "}"
                  "}",
                  "error: 1: static switch contains non-static conditional break\n1 error\n");
diff --git a/tests/SkSLFPTest.cpp b/tests/SkSLFPTest.cpp
index c3f9468..266169f 100644
--- a/tests/SkSLFPTest.cpp
+++ b/tests/SkSLFPTest.cpp
@@ -62,7 +62,7 @@
 DEF_TEST(SkSLFPHelloWorld, r) {
     test(r,
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = half4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {
@@ -132,7 +132,7 @@
              "        GrGLSLFPFragmentBuilder* fragBuilder = args.fFragBuilder;\n"
              "        const GrTest& _outer = args.fFp.cast<GrTest>();\n"
              "        (void) _outer;\n"
-             "        fragBuilder->codeAppendf(\"%s = float4(1.0);\\n\", args.fOutputColor);\n"
+             "        fragBuilder->codeAppendf(\"%s = half4(1.0);\\n\", args.fOutputColor);\n"
              "    }\n"
              "private:\n"
              "    void onSetData(const GrGLSLProgramDataManager& pdman, "
@@ -163,9 +163,9 @@
 
 DEF_TEST(SkSLFPInput, r) {
     test(r,
-         "in float2 point;"
+         "in half2 point;"
          "void main() {"
-         "sk_OutColor = float4(point, point);"
+         "sk_OutColor = half4(point, point);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {
@@ -176,7 +176,7 @@
              ", fPoint(point)"
          },
          {
-             "fragBuilder->codeAppendf(\"%s = float4(float2(%f, %f), float2(%f, %f));\\n\", "
+             "fragBuilder->codeAppendf(\"%s = half4(half2(%f, %f), half2(%f, %f));\\n\", "
                                       "args.fOutputColor, _outer.point().fX, _outer.point().fY, "
                                       "_outer.point().fX, _outer.point().fY);",
              "if (fPoint != that.fPoint) return false;"
@@ -185,7 +185,7 @@
 
 DEF_TEST(SkSLFPUniform, r) {
     test(r,
-         "uniform float4 color;"
+         "uniform half4 color;"
          "void main() {"
          "sk_OutColor = color;"
          "}",
@@ -194,14 +194,14 @@
              "static std::unique_ptr<GrFragmentProcessor> Make()"
          },
          {
-            "fColorVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kVec4f_GrSLType, "
+            "fColorVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kHalf4_GrSLType, "
                                                          "kDefault_GrSLPrecision, \"color\");",
          });
 }
 
 DEF_TEST(SkSLFPInUniform, r) {
     test(r,
-         "in uniform float4 color;"
+         "in uniform half4 color;"
          "void main() {"
          "sk_OutColor = color;"
          "}",
@@ -210,7 +210,7 @@
              "static std::unique_ptr<GrFragmentProcessor> Make(SkRect color) {",
          },
          {
-            "fColorVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kVec4f_GrSLType, "
+            "fColorVar = args.fUniformHandler->addUniform(kFragment_GrShaderFlag, kHalf4_GrSLType, "
                                                          "kDefault_GrSLPrecision, \"color\");",
             "const SkRect colorValue = _outer.color();",
             "pdman.set4fv(fColorVar, 1, (float*) &colorValue);"
@@ -221,7 +221,7 @@
     test(r,
          "@header { header section }"
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = half4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {
@@ -231,7 +231,7 @@
     test(r,
          "@class { class section }"
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = half4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {
@@ -243,16 +243,16 @@
     test(r,
          "@cpp { cpp section }"
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = half4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {},
          {"cpp section"});
     test(r,
          "@constructorParams { int x, float y, std::vector<float> z }"
-         "in float w;"
+         "in highfloat w;"
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = highfloat4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {
@@ -265,7 +265,7 @@
     test(r,
          "@constructor { constructor section }"
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = half4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {
@@ -275,7 +275,7 @@
     test(r,
          "@initializers { initializers section }"
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = half4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {
@@ -283,22 +283,22 @@
          },
          {});
     test(r,
-         "float x = 10;"
-         "@emitCode { fragBuilder->codeAppendf(\"float y = %d\\n\", x * 2); }"
+         "half x = 10;"
+         "@emitCode { fragBuilder->codeAppendf(\"half y = %d\\n\", x * 2); }"
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = half4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {},
          {
             "x = 10.0;\n"
-            " fragBuilder->codeAppendf(\"float y = %d\\n\", x * 2);"
+            " fragBuilder->codeAppendf(\"half y = %d\\n\", x * 2);"
          });
     test(r,
          "@fields { fields section }"
          "@clone { }"
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = half4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {
@@ -309,7 +309,7 @@
     test(r,
          "@make { make section }"
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = half4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {
@@ -318,11 +318,11 @@
          },
          {});
     test(r,
-         "uniform float calculated;"
-         "in float provided;"
+         "uniform half calculated;"
+         "in half provided;"
          "@setData(varName) { varName.set1f(calculated, provided * 2); }"
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = half4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {},
@@ -336,7 +336,7 @@
     test(r,
          "@test(testDataName) { testDataName section }"
          "void main() {"
-         "sk_OutColor = float4(1);"
+         "sk_OutColor = half4(1);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {},
@@ -353,7 +353,7 @@
          "in uniform sampler2D image;"
          "in uniform colorSpaceXform colorXform;"
          "void main() {"
-         "sk_OutColor = sk_InColor * texture(image, float2(0, 0), colorXform);"
+         "sk_OutColor = sk_InColor * texture(image, highfloat2(0, 0), colorXform);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {
@@ -363,12 +363,12 @@
              "sk_sp<GrColorSpaceXform> fColorXform;"
          },
          {
-             "fragBuilder->codeAppendf(\"float4 _tmpVar1;%s = %s * %stexture(%s, "
-             "float2(0.0, 0.0)).%s%s;\\n\", args.fOutputColor, args.fInputColor ? args.fInputColor : "
-             "\"float4(1)\", fColorSpaceHelper.isValid() ? \"(_tmpVar1 = \" : \"\", "
+             "fragBuilder->codeAppendf(\"half4 _tmpVar1;%s = %s * %stexture(%s, "
+             "highfloat2(0.0, 0.0)).%s%s;\\n\", args.fOutputColor, args.fInputColor ? args.fInputColor : "
+             "\"half4(1)\", fColorSpaceHelper.isValid() ? \"(_tmpVar1 = \" : \"\", "
              "fragBuilder->getProgramBuilder()->samplerVariable(args.fTexSamplers[0]).c_str(), "
              "fragBuilder->getProgramBuilder()->samplerSwizzle(args.fTexSamplers[0]).c_str(), "
-             "fColorSpaceHelper.isValid() ? SkStringPrintf(\", float4(clamp((%s * float4(_tmpVar1.rgb, "
+             "fColorSpaceHelper.isValid() ? SkStringPrintf(\", half4(clamp((%s * half4(_tmpVar1.rgb, "
              "1.0)).rgb, 0.0, _tmpVar1.a), _tmpVar1.a))\", args.fUniformHandler->getUniformCStr("
              "fColorSpaceHelper.gamutXformUniform())).c_str() : \"\");"
          });
@@ -377,14 +377,14 @@
 DEF_TEST(SkSLFPTransformedCoords, r) {
     test(r,
          "void main() {"
-         "sk_OutColor = float4(sk_TransformedCoords2D[0], sk_TransformedCoords2D[0]);"
+         "sk_OutColor = half4(sk_TransformedCoords2D[0], sk_TransformedCoords2D[0]);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          {},
          {
             "SkString sk_TransformedCoords2D_0 = "
                                          "fragBuilder->ensureCoords2D(args.fTransformedCoords[0]);",
-            "fragBuilder->codeAppendf(\"%s = float4(%s, %s);\\n\", args.fOutputColor, "
+            "fragBuilder->codeAppendf(\"%s = half4(%s, %s);\\n\", args.fOutputColor, "
                               "sk_TransformedCoords2D_0.c_str(), sk_TransformedCoords2D_0.c_str());"
          });
 
@@ -392,7 +392,7 @@
 
 DEF_TEST(SkSLFPLayoutWhen, r) {
     test(r,
-         "layout(when=someExpression(someOtherExpression())) uniform float sometimes;"
+         "layout(when=someExpression(someOtherExpression())) uniform half sometimes;"
          "void main() {"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
diff --git a/tests/SkSLGLSLTest.cpp b/tests/SkSLGLSLTest.cpp
index a7f6740..bfcedac 100644
--- a/tests/SkSLGLSLTest.cpp
+++ b/tests/SkSLGLSLTest.cpp
@@ -51,7 +51,7 @@
 
 DEF_TEST(SkSLHelloWorld, r) {
     test(r,
-         "void main() { sk_FragColor = float4(0.75); }",
+         "void main() { sk_FragColor = highfloat4(0.75); }",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
          "out vec4 sk_FragColor;\n"
@@ -63,7 +63,7 @@
 DEF_TEST(SkSLControl, r) {
     test(r,
          "void main() {"
-         "if (sqrt(2) > 5) { sk_FragColor = float4(0.75); } else { discard; }"
+         "if (sqrt(2) > 5) { sk_FragColor = highfloat4(0.75); } else { discard; }"
          "int i = 0;"
          "while (i < 10) { sk_FragColor *= 0.5; i++; }"
          "do { sk_FragColor += 0.01; } while (sk_FragColor.x < 0.75);"
@@ -98,9 +98,9 @@
 
 DEF_TEST(SkSLFunctions, r) {
     test(r,
-         "float foo(float v[2]) { return v[0] * v[1]; }"
-         "void bar(inout float x) { float y[2], z; y[0] = x; y[1] = x * 2; z = foo(y); x = z; }"
-         "void main() { float x = 10; bar(x); sk_FragColor = float4(x); }",
+         "highfloat foo(highfloat v[2]) { return v[0] * v[1]; }"
+         "void bar(inout highfloat x) { highfloat y[2], z; y[0] = x; y[1] = x * 2; z = foo(y); x = z; }"
+         "void main() { highfloat x = 10; bar(x); sk_FragColor = highfloat4(x); }",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
          "out vec4 sk_FragColor;\n"
@@ -124,7 +124,7 @@
 DEF_TEST(SkSLOperators, r) {
     test(r,
          "void main() {"
-         "float x = 1, y = 2;"
+         "highfloat x = 1, y = 2;"
          "int z = 3;"
          "x = x - x + y * z * x * (y - z);"
          "y = x / y / z;"
@@ -142,8 +142,8 @@
          "z >>= 2;"
          "z <<= 4;"
          "z %= 5;"
-         "x = (float2(sqrt(1)) , 6);"
-         "z = (float2(sqrt(1)) , 6);"
+         "x = (highfloat2(sqrt(1)) , 6);"
+         "z = (highfloat2(sqrt(1)) , 6);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -175,12 +175,12 @@
 DEF_TEST(SkSLMatrices, r) {
     test(r,
          "void main() {"
-         "float2x4 x = float2x4(1);"
-         "float3x2 y = float3x2(1, 0, 0, 1, float2(2, 2));"
-         "float3x4 z = x * y;"
-         "float3 v1 = float3x3(1) * float3(2);"
-         "float3 v2 = float3(2) * float3x3(1);"
-         "sk_FragColor = float4(z[0].x, v1 + v2);"
+         "highfloat2x4 x = highfloat2x4(1);"
+         "highfloat3x2 y = highfloat3x2(1, 0, 0, 1, highfloat2(2, 2));"
+         "highfloat3x4 z = x * y;"
+         "highfloat3 v1 = highfloat3x3(1) * highfloat3(2);"
+         "highfloat3 v2 = highfloat3(2) * highfloat3x3(1);"
+         "sk_FragColor = highfloat4(z[0].x, v1 + v2);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -196,13 +196,13 @@
 DEF_TEST(SkSLInterfaceBlock, r) {
     test(r,
          "uniform testBlock {"
-         "float x;"
-         "float y[2];"
-         "layout(binding=12) float3x2 z;"
+         "half x;"
+         "half y[2];"
+         "layout(binding=12) half3x2 z;"
          "bool w;"
          "};"
          "void main() {"
-         "    sk_FragColor = float4(x, y[0], y[1], 0);"
+         "    sk_FragColor = half4(x, y[0], y[1], 0);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -218,10 +218,10 @@
          "}\n");
     test(r,
          "uniform testBlock {"
-         "float x;"
+         "highfloat x;"
          "} test;"
          "void main() {"
-         "    sk_FragColor = float4(test.x);"
+         "    sk_FragColor = half4(test.x);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -234,10 +234,10 @@
          "}\n");
     test(r,
          "uniform testBlock {"
-         "float x;"
+         "highfloat x;"
          "} test[2];"
          "void main() {"
-         "    sk_FragColor = float4(test[1].x);"
+         "    sk_FragColor = half4(test[1].x);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -258,8 +258,8 @@
          "} a1, a2;"
          "A a3;"
          "struct B {"
-         "float x;"
-         "float y[2];"
+         "highfloat x;"
+         "highfloat y[2];"
          "layout(binding=1) A z;"
          "};"
          "B b1, b2, b3;"
@@ -284,7 +284,7 @@
 
 DEF_TEST(SkSLVersion, r) {
     test(r,
-         "in float test; void main() { sk_FragColor = float4(0.75); }",
+         "in highfloat test; void main() { sk_FragColor = highfloat4(0.75); }",
          *SkSL::ShaderCapsFactory::Version450Core(),
          "#version 450 core\n"
          "out vec4 sk_FragColor;\n"
@@ -293,7 +293,7 @@
          "    sk_FragColor = vec4(0.75);\n"
          "}\n");
     test(r,
-         "in float test; void main() { sk_FragColor = float4(0.75); }",
+         "in highfloat test; void main() { sk_FragColor = highfloat4(0.75); }",
          *SkSL::ShaderCapsFactory::Version110(),
          "#version 110\n"
          "varying float test;\n"
@@ -304,8 +304,8 @@
 
 DEF_TEST(SkSLUsesPrecisionModifiers, r) {
     test(r,
-         "void main() { float x = 0.75; highp float y = 1; x++; y++;"
-         "sk_FragColor.rg = float2(x, y); }",
+         "void main() { half x = 0.75; highfloat y = 1; x++; y++;"
+         "sk_FragColor.rg = half2(x, y); }",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
          "out vec4 sk_FragColor;\n"
@@ -317,15 +317,15 @@
          "    sk_FragColor.xy = vec2(x, y);\n"
          "}\n");
     test(r,
-         "void main() { float x = 0.75; half y = 1; x++; y++;"
-         "sk_FragColor.rg = float2(x, y); }",
+         "void main() { half x = 0.75; highfloat y = 1; x++; y++;"
+         "sk_FragColor.rg = half2(x, y); }",
          *SkSL::ShaderCapsFactory::UsesPrecisionModifiers(),
          "#version 400\n"
-         "precision highp float;\n"
+         "precision mediump float;\n"
          "out mediump vec4 sk_FragColor;\n"
          "void main() {\n"
-         "    float x = 0.75;\n"
-         "    mediump float y = 1.0;\n"
+         "    mediump float x = 0.75;\n"
+         "    highp float y = 1.0;\n"
          "    x++;\n"
          "    y++;\n"
          "    sk_FragColor.xy = vec2(x, y);\n"
@@ -335,7 +335,7 @@
 DEF_TEST(SkSLMinAbs, r) {
     test(r,
          "void main() {"
-         "float x = -5;"
+         "highfloat x = -5;"
          "sk_FragColor.r = min(abs(x), 6);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
@@ -347,7 +347,7 @@
 
     test(r,
          "void main() {"
-         "float x = -5.0;"
+         "highfloat x = -5.0;"
          "sk_FragColor.r = min(abs(x), 6.0);"
          "}",
          *SkSL::ShaderCapsFactory::CannotUseMinAndAbsTogether(),
@@ -364,7 +364,7 @@
 DEF_TEST(SkSLFractNegative, r) {
     static constexpr char input[] =
         "void main() {"
-        "float x = -42.0;"
+        "highfloat x = -42.0;"
         "sk_FragColor.r = fract(x);"
         "}";
     static constexpr char output_default[] =
@@ -386,7 +386,7 @@
 
 DEF_TEST(SkSLNegatedAtan, r) {
     test(r,
-         "void main() { float2 x = float2(sqrt(2)); sk_FragColor.r = atan(x.x, -x.y); }",
+         "void main() { highfloat2 x = highfloat2(sqrt(2)); sk_FragColor.r = atan(x.x, -x.y); }",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
          "out vec4 sk_FragColor;\n"
@@ -395,7 +395,7 @@
          "    sk_FragColor.x = atan(x.x, -x.y);\n"
          "}\n");
     test(r,
-         "void main() { float2 x = float2(sqrt(2)); sk_FragColor.r = atan(x.x, -x.y); }",
+         "void main() { highfloat2 x = highfloat2(sqrt(2)); sk_FragColor.r = atan(x.x, -x.y); }",
          *SkSL::ShaderCapsFactory::MustForceNegatedAtanParamToFloat(),
          "#version 400\n"
          "out vec4 sk_FragColor;\n"
@@ -466,13 +466,13 @@
 
 DEF_TEST(SkSLVectorConstructors, r) {
     test(r,
-         "float2 v1 = float2(1);"
-         "float2 v2 = float2(1, 2);"
-         "float2 v3 = float2(float2(1));"
-         "float3 v4 = float3(float2(1), 1.0);"
+         "highfloat2 v1 = highfloat2(1);"
+         "highfloat2 v2 = highfloat2(1, 2);"
+         "highfloat2 v3 = highfloat2(highfloat2(1));"
+         "highfloat3 v4 = highfloat3(highfloat2(1), 1.0);"
          "int2 v5 = int2(1);"
-         "int2 v6 = int2(float2(1, 2));"
-         "float2 v7 = float2(int2(1, 2));",
+         "int2 v6 = int2(highfloat2(1, 2));"
+         "highfloat2 v7 = highfloat2(int2(1, 2));",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
          "out vec4 sk_FragColor;\n"
@@ -487,9 +487,9 @@
 
 DEF_TEST(SkSLArrayConstructors, r) {
     test(r,
-         "float test1[] = float[](1, 2, 3, 4);"
-         "float2 test2[] = float2[](float2(1, 2), float2(3, 4));"
-         "float4x4 test3[] = float4x4[]();",
+         "highfloat test1[] = highfloat[](1, 2, 3, 4);"
+         "highfloat2 test2[] = highfloat2[](highfloat2(1, 2), highfloat2(3, 4));"
+         "highfloat4x4 test3[] = highfloat4x4[]();",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
          "out vec4 sk_FragColor;\n"
@@ -511,7 +511,7 @@
          "void main() { sk_FragColor.r = 1; }",
          *SkSL::ShaderCapsFactory::ShaderDerivativeExtensionString(),
          "#version 400\n"
-         "precision highp float;\n"
+         "precision mediump float;\n"
          "out mediump vec4 sk_FragColor;\n"
          "void main() {\n"
          "    sk_FragColor.x = 1.0;\n"
@@ -521,7 +521,7 @@
          *SkSL::ShaderCapsFactory::ShaderDerivativeExtensionString(),
          "#version 400\n"
          "#extension GL_OES_standard_derivatives : require\n"
-         "precision highp float;\n"
+         "precision mediump float;\n"
          "out mediump vec4 sk_FragColor;\n"
          "void main() {\n"
          "    sk_FragColor.x = dFdx(1.0);\n"
@@ -717,55 +717,55 @@
 DEF_TEST(SkSLVecFolding, r) {
     test(r,
          "void main() {"
-         "sk_FragColor.r = float4(0.5, 1, 1, 1).x;"
-         "sk_FragColor = float4(float2(1), float2(2, 3)) + float4(5, 6, 7, 8);"
-         "sk_FragColor = float4(8, float3(10)) - float4(1);"
-         "sk_FragColor = float4(2) * float4(1, 2, 3, 4);"
-         "sk_FragColor = float4(12) / float4(1, 2, 3, 4);"
-         "sk_FragColor.r = (float4(12) / float4(1, 2, 3, 4)).y;"
-         "sk_FragColor.x = float4(1) == float4(1) ? 1.0 : -1.0;"
-         "sk_FragColor.x = float4(1) == float4(2) ? 2.0 : -2.0;"
-         "sk_FragColor.x = float2(1) == float2(1, 1) ? 3.0 : -3.0;"
-         "sk_FragColor.x = float2(1, 1) == float2(1, 1) ? 4.0 : -4.0;"
-         "sk_FragColor.x = float2(1) == float2(1, 0) ? 5.0 : -5.0;"
-         "sk_FragColor.x = float4(1) == float4(float2(1), float2(1)) ? 6.0 : -6.0;"
-         "sk_FragColor.x = float4(float3(1), 1) == float4(float2(1), float2(1)) ? 7.0 : -7.0;"
-         "sk_FragColor.x = float4(float3(1), 1) == float4(float2(1), 1, 0) ? 8.0 : -8.0;"
-         "sk_FragColor.x = float2(1) != float2(1, 0) ? 9.0 : -9.0;"
-         "sk_FragColor.x = float4(1) != float4(float2(1), float2(1)) ? 10.0 : -10.0;"
-         "sk_FragColor = float4(sqrt(1)) * float4(1);"
-         "sk_FragColor = float4(1) * float4(sqrt(2));"
-         "sk_FragColor = float4(0) * float4(sqrt(3));"
-         "sk_FragColor = float4(sqrt(4)) * float4(0);"
-         "sk_FragColor = float4(0) / float4(sqrt(5));"
-         "sk_FragColor = float4(0) + float4(sqrt(6));"
-         "sk_FragColor = float4(sqrt(7)) + float4(0);"
-         "sk_FragColor = float4(sqrt(8)) - float4(0);"
-         "sk_FragColor = float4(0) + sqrt(9);"
-         "sk_FragColor = float4(0) * sqrt(10);"
-         "sk_FragColor = float4(0) / sqrt(11);"
-         "sk_FragColor = float4(1) * sqrt(12);"
-         "sk_FragColor = 0 + float4(sqrt(13));"
-         "sk_FragColor = 0 * float4(sqrt(14));"
-         "sk_FragColor = 0 / float4(sqrt(15));"
-         "sk_FragColor = 1 * float4(sqrt(16));"
-         "sk_FragColor = float4(sqrt(17)) + 0;"
-         "sk_FragColor = float4(sqrt(18)) * 0;"
-         "sk_FragColor = float4(sqrt(19)) * 1;"
-         "sk_FragColor = float4(sqrt(19.5)) - 0;"
-         "sk_FragColor = sqrt(20) * float4(1);"
-         "sk_FragColor = sqrt(21) + float4(0);"
-         "sk_FragColor = sqrt(22) - float4(0);"
-         "sk_FragColor = sqrt(23) / float4(1);"
-         "sk_FragColor = float4(sqrt(24)) / 1;"
-         "sk_FragColor += float4(1);"
-         "sk_FragColor += float4(0);"
-         "sk_FragColor -= float4(1);"
-         "sk_FragColor -= float4(0);"
-         "sk_FragColor *= float4(1);"
-         "sk_FragColor *= float4(2);"
-         "sk_FragColor /= float4(1);"
-         "sk_FragColor /= float4(2);"
+         "sk_FragColor.r = highfloat4(0.5, 1, 1, 1).x;"
+         "sk_FragColor = highfloat4(highfloat2(1), highfloat2(2, 3)) + highfloat4(5, 6, 7, 8);"
+         "sk_FragColor = highfloat4(8, highfloat3(10)) - highfloat4(1);"
+         "sk_FragColor = highfloat4(2) * highfloat4(1, 2, 3, 4);"
+         "sk_FragColor = highfloat4(12) / highfloat4(1, 2, 3, 4);"
+         "sk_FragColor.r = (highfloat4(12) / highfloat4(1, 2, 3, 4)).y;"
+         "sk_FragColor.x = highfloat4(1) == highfloat4(1) ? 1.0 : -1.0;"
+         "sk_FragColor.x = highfloat4(1) == highfloat4(2) ? 2.0 : -2.0;"
+         "sk_FragColor.x = highfloat2(1) == highfloat2(1, 1) ? 3.0 : -3.0;"
+         "sk_FragColor.x = highfloat2(1, 1) == highfloat2(1, 1) ? 4.0 : -4.0;"
+         "sk_FragColor.x = highfloat2(1) == highfloat2(1, 0) ? 5.0 : -5.0;"
+         "sk_FragColor.x = highfloat4(1) == highfloat4(highfloat2(1), highfloat2(1)) ? 6.0 : -6.0;"
+         "sk_FragColor.x = highfloat4(highfloat3(1), 1) == highfloat4(highfloat2(1), highfloat2(1)) ? 7.0 : -7.0;"
+         "sk_FragColor.x = highfloat4(highfloat3(1), 1) == highfloat4(highfloat2(1), 1, 0) ? 8.0 : -8.0;"
+         "sk_FragColor.x = highfloat2(1) != highfloat2(1, 0) ? 9.0 : -9.0;"
+         "sk_FragColor.x = highfloat4(1) != highfloat4(highfloat2(1), highfloat2(1)) ? 10.0 : -10.0;"
+         "sk_FragColor = highfloat4(sqrt(1)) * highfloat4(1);"
+         "sk_FragColor = highfloat4(1) * highfloat4(sqrt(2));"
+         "sk_FragColor = highfloat4(0) * highfloat4(sqrt(3));"
+         "sk_FragColor = highfloat4(sqrt(4)) * highfloat4(0);"
+         "sk_FragColor = highfloat4(0) / highfloat4(sqrt(5));"
+         "sk_FragColor = highfloat4(0) + highfloat4(sqrt(6));"
+         "sk_FragColor = highfloat4(sqrt(7)) + highfloat4(0);"
+         "sk_FragColor = highfloat4(sqrt(8)) - highfloat4(0);"
+         "sk_FragColor = highfloat4(0) + sqrt(9);"
+         "sk_FragColor = highfloat4(0) * sqrt(10);"
+         "sk_FragColor = highfloat4(0) / sqrt(11);"
+         "sk_FragColor = highfloat4(1) * sqrt(12);"
+         "sk_FragColor = 0 + highfloat4(sqrt(13));"
+         "sk_FragColor = 0 * highfloat4(sqrt(14));"
+         "sk_FragColor = 0 / highfloat4(sqrt(15));"
+         "sk_FragColor = 1 * highfloat4(sqrt(16));"
+         "sk_FragColor = highfloat4(sqrt(17)) + 0;"
+         "sk_FragColor = highfloat4(sqrt(18)) * 0;"
+         "sk_FragColor = highfloat4(sqrt(19)) * 1;"
+         "sk_FragColor = highfloat4(sqrt(19.5)) - 0;"
+         "sk_FragColor = sqrt(20) * highfloat4(1);"
+         "sk_FragColor = sqrt(21) + highfloat4(0);"
+         "sk_FragColor = sqrt(22) - highfloat4(0);"
+         "sk_FragColor = sqrt(23) / highfloat4(1);"
+         "sk_FragColor = highfloat4(sqrt(24)) / 1;"
+         "sk_FragColor += highfloat4(1);"
+         "sk_FragColor += highfloat4(0);"
+         "sk_FragColor -= highfloat4(1);"
+         "sk_FragColor -= highfloat4(0);"
+         "sk_FragColor *= highfloat4(1);"
+         "sk_FragColor *= highfloat4(2);"
+         "sk_FragColor /= highfloat4(1);"
+         "sk_FragColor /= highfloat4(2);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -822,24 +822,24 @@
 DEF_TEST(SkSLMatFolding, r) {
     test(r,
          "void main() {"
-         "sk_FragColor.x = float2x2(float2(1.0, 0.0), float2(0.0, 1.0)) == "
-                          "float2x2(float2(1.0, 0.0), float2(0.0, 1.0)) ? 1 : -1;"
-         "sk_FragColor.x = float2x2(float2(1.0, 0.0), float2(1.0, 1.0)) == "
-                          "float2x2(float2(1.0, 0.0), float2(0.0, 1.0)) ? 2 : -2;"
-         "sk_FragColor.x = float2x2(1) == float2x2(1) ? 3 : -3;"
-         "sk_FragColor.x = float2x2(1) == float2x2(0) ? 4 : -4;"
-         "sk_FragColor.x = float2x2(1) == float2x2(float2(1.0, 0.0), float2(0.0, 1.0)) ? 5 : -5;"
-         "sk_FragColor.x = float2x2(2) == float2x2(float2(1.0, 0.0), float2(0.0, 1.0)) ? 6 : -6;"
-         "sk_FragColor.x = float3x2(2) == float3x2(float2(2.0, 0.0), float2(0.0, 2.0), float2(0.0))"
+         "sk_FragColor.x = highfloat2x2(highfloat2(1.0, 0.0), highfloat2(0.0, 1.0)) == "
+                          "highfloat2x2(highfloat2(1.0, 0.0), highfloat2(0.0, 1.0)) ? 1 : -1;"
+         "sk_FragColor.x = highfloat2x2(highfloat2(1.0, 0.0), highfloat2(1.0, 1.0)) == "
+                          "highfloat2x2(highfloat2(1.0, 0.0), highfloat2(0.0, 1.0)) ? 2 : -2;"
+         "sk_FragColor.x = highfloat2x2(1) == highfloat2x2(1) ? 3 : -3;"
+         "sk_FragColor.x = highfloat2x2(1) == highfloat2x2(0) ? 4 : -4;"
+         "sk_FragColor.x = highfloat2x2(1) == highfloat2x2(highfloat2(1.0, 0.0), highfloat2(0.0, 1.0)) ? 5 : -5;"
+         "sk_FragColor.x = highfloat2x2(2) == highfloat2x2(highfloat2(1.0, 0.0), highfloat2(0.0, 1.0)) ? 6 : -6;"
+         "sk_FragColor.x = highfloat3x2(2) == highfloat3x2(highfloat2(2.0, 0.0), highfloat2(0.0, 2.0), highfloat2(0.0))"
                            "? 7 : -7;"
-         "sk_FragColor.x = float2x2(1) != float2x2(1) ? 8 : -8;"
-         "sk_FragColor.x = float2x2(1) != float2x2(0) ? 9 : -9;"
-         "sk_FragColor.x = float3x3(float3(1.0, 0.0, 0.0), float3(0.0, 1.0, 0.0), "
-                          "float3(0.0, 0.0, 0.0)) == float3x3(float2x2(1.0)) ? 10 : -10;"
-         "sk_FragColor.x = float2x2(float3x3(1.0)) == float2x2(1.0) ? 11 : -11;"
-         "sk_FragColor.x = float2x2(float4(1.0, 0.0, 0.0, 1.0)) == float2x2(1.0) ? 12 : -12;"
-         "sk_FragColor.x = float2x2(1.0, 0.0, float2(0.0, 1.0)) == float2x2(1.0) ? 13 : -13;"
-         "sk_FragColor.x = float2x2(float2(1.0, 0.0), 0.0, 1.0) == float2x2(1.0) ? 14 : -14;"
+         "sk_FragColor.x = highfloat2x2(1) != highfloat2x2(1) ? 8 : -8;"
+         "sk_FragColor.x = highfloat2x2(1) != highfloat2x2(0) ? 9 : -9;"
+         "sk_FragColor.x = highfloat3x3(highfloat3(1.0, 0.0, 0.0), highfloat3(0.0, 1.0, 0.0), "
+                          "highfloat3(0.0, 0.0, 0.0)) == highfloat3x3(highfloat2x2(1.0)) ? 10 : -10;"
+         "sk_FragColor.x = highfloat2x2(highfloat3x3(1.0)) == highfloat2x2(1.0) ? 11 : -11;"
+         "sk_FragColor.x = highfloat2x2(highfloat4(1.0, 0.0, 0.0, 1.0)) == highfloat2x2(1.0) ? 12 : -12;"
+         "sk_FragColor.x = highfloat2x2(1.0, 0.0, highfloat2(0.0, 1.0)) == highfloat2x2(1.0) ? 13 : -13;"
+         "sk_FragColor.x = highfloat2x2(highfloat2(1.0, 0.0), 0.0, 1.0) == highfloat2x2(1.0) ? 14 : -14;"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -891,7 +891,7 @@
          "if (sk_Caps.fbFetchSupport) y = 1;"
          "if (sk_Caps.dropsTileOnZeroDivide && sk_Caps.texelFetchSupport) z = 1;"
          "if (sk_Caps.dropsTileOnZeroDivide && sk_Caps.canUseAnyFunctionInShader) w = 1;"
-         "sk_FragColor = float4(x, y, z, w);"
+         "sk_FragColor = half4(x, y, z, w);"
          "}",
          *SkSL::ShaderCapsFactory::VariousCaps(),
          "#version 400\n"
@@ -906,11 +906,11 @@
          "uniform sampler1D one;"
          "uniform sampler2D two;"
          "void main() {"
-         "float4 a = texture(one, 0);"
-         "float4 b = texture(two, float2(0));"
-         "float4 c = texture(one, float2(0));"
-         "float4 d = texture(two, float3(0));"
-         "sk_FragColor = float4(a.x, b.x, c.x, d.x);"
+         "highfloat4 a = texture(one, 0);"
+         "highfloat4 b = texture(two, highfloat2(0));"
+         "highfloat4 c = texture(one, highfloat2(0));"
+         "highfloat4 d = texture(two, highfloat3(0));"
+         "sk_FragColor = half4(a.x, b.x, c.x, d.x);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -928,11 +928,11 @@
          "uniform sampler1D one;"
          "uniform sampler2D two;"
          "void main() {"
-         "float4 a = texture(one, 0);"
-         "float4 b = texture(two, float2(0));"
-         "float4 c = texture(one, float2(0));"
-         "float4 d = texture(two, float3(0));"
-         "sk_FragColor = float4(a.x, b.x, c.x, d.x);"
+         "highfloat4 a = texture(one, 0);"
+         "highfloat4 b = texture(two, highfloat2(0));"
+         "highfloat4 c = texture(one, highfloat2(0));"
+         "highfloat4 d = texture(two, highfloat3(0));"
+         "sk_FragColor = half4(a.x, b.x, c.x, d.x);"
          "}",
          *SkSL::ShaderCapsFactory::Version110(),
          "#version 110\n"
@@ -1047,7 +1047,7 @@
          "}\n",
          SkSL::Program::kVertex_Kind);
     test(r,
-         "void main() { sk_FragColor = float4(sk_ClipDistance[0]); }",
+         "void main() { sk_FragColor = half4(sk_ClipDistance[0]); }",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
          "out vec4 sk_FragColor;\n"
@@ -1058,9 +1058,9 @@
 
 DEF_TEST(SkSLArrayTypes, r) {
     test(r,
-         "void main() { float2 x[2] = float2[2](float2(1), float2(2));"
-         "float2[2] y = float2[2](float2(3), float2(4));"
-         "sk_FragColor = float4(x[0], y[1]); }",
+         "void main() { highfloat2 x[2] = highfloat2[2](highfloat2(1), highfloat2(2));"
+         "highfloat2[2] y = highfloat2[2](highfloat2(3), highfloat2(4));"
+         "sk_FragColor = highfloat4(x[0], y[1]); }",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
          "out vec4 sk_FragColor;\n"
@@ -1076,9 +1076,9 @@
          "layout(invocations = 2) in;"
          "layout(line_strip, max_vertices = 2) out;"
          "void main() {"
-         "gl_Position = sk_in[0].gl_Position + float4(-0.5, 0, 0, sk_InvocationID);"
+         "gl_Position = sk_in[0].gl_Position + highfloat4(-0.5, 0, 0, sk_InvocationID);"
          "EmitVertex();"
-         "gl_Position = sk_in[0].gl_Position + float4(0.5, 0, 0, sk_InvocationID);"
+         "gl_Position = sk_in[0].gl_Position + highfloat4(0.5, 0, 0, sk_InvocationID);"
          "EmitVertex();"
          "EndPrimitive();"
          "}",
@@ -1101,7 +1101,7 @@
     // basic "does a switch even work" test
     test(r,
          "void main() {"
-         "    float x;"
+         "    highfloat x;"
          "    switch (int(sqrt(1))) {"
          "        case 0:"
          "            x = 0.0;"
@@ -1112,7 +1112,7 @@
          "        default:"
          "            x = 2.0;"
          "    }"
-         "    sk_FragColor = float4(x);"
+         "    sk_FragColor = highfloat4(x);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1134,7 +1134,7 @@
     // dead code inside of switch
     test(r,
          "void main() {"
-         "    float x;"
+         "    highfloat x;"
          "    switch (int(sqrt(2))) {"
          "        case 0:"
          "            x = 0.0;"
@@ -1143,7 +1143,7 @@
          "        default:"
          "            x = 2.0;"
          "    }"
-         "    sk_FragColor = float4(x);"
+         "    sk_FragColor = half4(x);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1162,14 +1162,14 @@
     // non-static test w/ fallthrough
     test(r,
          "void main() {"
-         "    float x = 0.0;"
+         "    highfloat x = 0.0;"
          "    switch (int(sqrt(3))) {"
          "        case 0:"
          "            x = 0.0;"
          "        case 1:"
          "            x = 1.0;"
          "    }"
-         "    sk_FragColor = float4(x);"
+         "    sk_FragColor = half4(x);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1187,14 +1187,14 @@
     // static test w/ fallthrough
     test(r,
          "void main() {"
-         "    float x = 0.0;"
+         "    highfloat x = 0.0;"
          "    switch (0) {"
          "        case 0:"
          "            x = 0.0;"
          "        case 1:"
          "            x = 1.0;"
          "    }"
-         "    sk_FragColor = float4(x);"
+         "    sk_FragColor = half4(x);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1205,14 +1205,14 @@
     // static test w/ fallthrough, different entry point
     test(r,
          "void main() {"
-         "    float x = 0.0;"
+         "    highfloat x = 0.0;"
          "    switch (1) {"
          "        case 0:"
          "            x = 0.0;"
          "        case 1:"
          "            x = 1.0;"
          "    }"
-         "    sk_FragColor = float4(x);"
+         "    sk_FragColor = half4(x);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1223,7 +1223,7 @@
     // static test w/ break
     test(r,
          "void main() {"
-         "    float x = 0.0;"
+         "    highfloat x = 0.0;"
          "    switch (0) {"
          "        case 0:"
          "            x = 0.0;"
@@ -1231,7 +1231,7 @@
          "        case 1:"
          "            x = 1.0;"
          "    }"
-         "    sk_FragColor = float4(x);"
+         "    sk_FragColor = half4(x);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1242,7 +1242,7 @@
     // static test w/ static conditional break
     test(r,
          "void main() {"
-         "    float x = 0.0;"
+         "    highfloat x = 0.0;"
          "    switch (0) {"
          "        case 0:"
          "            x = 0.0;"
@@ -1250,7 +1250,7 @@
          "        case 1:"
          "            x = 1.0;"
          "    }"
-         "    sk_FragColor = float4(x);"
+         "    sk_FragColor = half4(x);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1261,7 +1261,7 @@
     // static test w/ non-static conditional break
     test(r,
          "void main() {"
-         "    float x = 0.0;"
+         "    highfloat x = 0.0;"
          "    switch (0) {"
          "        case 0:"
          "            x = 0.0;"
@@ -1269,7 +1269,7 @@
          "        case 1:"
          "            x = 1.0;"
          "    }"
-         "    sk_FragColor = float4(x);"
+         "    sk_FragColor = half4(x);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1291,7 +1291,7 @@
     test(r,
          "uniform sampler2D test;"
          "void main() {"
-         "    sk_FragColor = texture(test, float2(0.5));"
+         "    sk_FragColor = texture(test, highfloat2(0.5));"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1303,7 +1303,7 @@
     test(r,
          "uniform sampler2DRect test;"
          "void main() {"
-         "    sk_FragColor = texture(test, float2(0.5));"
+         "    sk_FragColor = texture(test, highfloat2(0.5));"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1315,7 +1315,7 @@
     test(r,
          "uniform sampler2DRect test;"
          "void main() {"
-         "    sk_FragColor = texture(test, float3(0.5));"
+         "    sk_FragColor = texture(test, highfloat3(0.5));"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1329,12 +1329,12 @@
 DEF_TEST(SkSLUnusedVars, r) {
     test(r,
          "void main() {"
-         "float a = 1, b = 2, c = 3;"
-         "float d = c;"
-         "float e = d;"
+         "highfloat a = 1, b = 2, c = 3;"
+         "highfloat d = c;"
+         "highfloat e = d;"
          "b++;"
          "d++;"
-         "sk_FragColor = float4(b, b, d, d);"
+         "sk_FragColor = highfloat4(b, b, d, d);"
          "}",
         *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1351,11 +1351,11 @@
 DEF_TEST(SkSLMultipleAssignments, r) {
     test(r,
          "void main() {"
-         "float x;"
-         "float y;"
+         "highfloat x;"
+         "highfloat y;"
          "int z;"
          "x = y = z = 1;"
-         "sk_FragColor = float4(z);"
+         "sk_FragColor = highfloat4(z);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1367,13 +1367,13 @@
 
 DEF_TEST(SkSLComplexDelete, r) {
     test(r,
-         "uniform float4x4 colorXform;"
+         "uniform highfloat4x4 colorXform;"
          "uniform sampler2D sampler;"
          "void main() {"
-         "float4 tmpColor;"
-         "sk_FragColor = float4(1.0) * (tmpColor = texture(sampler, float2(1)) , "
-         "colorXform != float4x4(1.0) ? float4(clamp((float4x4(colorXform) * "
-                                                     "float4(tmpColor.xyz, 1.0)).xyz, "
+         "highfloat4 tmpColor;"
+         "sk_FragColor = highfloat4(1.0) * (tmpColor = texture(sampler, highfloat2(1)) , "
+         "colorXform != highfloat4x4(1.0) ? highfloat4(clamp((highfloat4x4(colorXform) * "
+                                                     "highfloat4(tmpColor.xyz, 1.0)).xyz, "
                                                      "0.0, tmpColor.w), tmpColor.w) : tmpColor);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
@@ -1392,8 +1392,8 @@
 DEF_TEST(SkSLDependentInitializers, r) {
     test(r,
          "void main() {"
-         "float x = 0.5, y = x * 2;"
-         "sk_FragColor = float4(y);"
+         "highfloat x = 0.5, y = x * 2;"
+         "sk_FragColor = highfloat4(y);"
          "}",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
@@ -1427,11 +1427,11 @@
          "layout(invocations = 2) in;"
          "layout(line_strip, max_vertices = 2) out;"
          "void test() {"
-         "gl_Position = sk_in[0].gl_Position + float4(0.5, 0, 0, sk_InvocationID);"
+         "gl_Position = sk_in[0].gl_Position + highfloat4(0.5, 0, 0, sk_InvocationID);"
          "EmitVertex();"
          "}"
          "void main() {"
-         "gl_Position = sk_in[0].gl_Position + float4(-0.5, 0, 0, sk_InvocationID);"
+         "gl_Position = sk_in[0].gl_Position + highfloat4(-0.5, 0, 0, sk_InvocationID);"
          "EmitVertex();"
          "}",
          *SkSL::ShaderCapsFactory::MustImplementGSInvocationsWithLoop(),
@@ -1458,13 +1458,13 @@
 
 DEF_TEST(SkSLTypePrecision, r) {
     test(r,
-         "float f = 1;"
+         "highfloat f = 1;"
          "half h = 2;"
          "double d = 3;"
-         "float2 f2 = float2(1, 2);"
+         "highfloat2 f2 = highfloat2(1, 2);"
          "half3 h3 = half3(1, 2, 3);"
          "double4 d4 = double4(1, 2, 3, 4);"
-         "float2x2 f22 = float2x2(1, 2, 3, 4);"
+         "highfloat2x2 f22 = highfloat2x2(1, 2, 3, 4);"
          "half2x4 h24 = half2x4(1, 2, 3, 4, 5, 6, 7, 8);"
          "double4x2 d42 = double4x2(1, 2, 3, 4, 5, 6, 7, 8);",
          *SkSL::ShaderCapsFactory::Default(),
@@ -1480,21 +1480,21 @@
          "mat2x4 h24 = mat2x4(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0);\n"
          "dmat4x2 d42 = dmat4x2(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0);\n");
     test(r,
-         "float f = 1;"
+         "highfloat f = 1;"
          "half h = 2;"
-         "float2 f2 = float2(1, 2);"
+         "highfloat2 f2 = highfloat2(1, 2);"
          "half3 h3 = half3(1, 2, 3);"
-         "float2x2 f22 = float2x2(1, 2, 3, 4);"
+         "highfloat2x2 f22 = highfloat2x2(1, 2, 3, 4);"
          "half2x4 h24 = half2x4(1, 2, 3, 4, 5, 6, 7, 8);",
          *SkSL::ShaderCapsFactory::UsesPrecisionModifiers(),
          "#version 400\n"
-         "precision highp float;\n"
+         "precision mediump float;\n"
          "out mediump vec4 sk_FragColor;\n"
-         "float f = 1.0;\n"
+         "highp float f = 1.0;\n"
          "mediump float h = 2.0;\n"
-         "vec2 f2 = vec2(1.0, 2.0);\n"
+         "highp vec2 f2 = vec2(1.0, 2.0);\n"
          "mediump vec3 h3 = vec3(1.0, 2.0, 3.0);\n"
-         "mat2 f22 = mat2(1.0, 2.0, 3.0, 4.0);\n"
+         "highp mat2 f22 = mat2(1.0, 2.0, 3.0, 4.0);\n"
          "mediump mat2x4 h24 = mat2x4(1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0);\n");
 }
 
@@ -1505,50 +1505,37 @@
          "ushort us = ushort(sqrt(1));"
          "uint ui = uint(sqrt(1));"
          "half h = sqrt(1);"
-         "float f = sqrt(1);"
-         "double d = sqrt(1);"
+         "highfloat f = sqrt(1);"
          "short s2s = s;"
          "short i2s = i;"
          "short us2s = short(us);"
          "short ui2s = short(ui);"
          "short h2s = short(h);"
          "short f2s = short(f);"
-         "short d2fs = short(d);"
          "int s2i = s;"
          "int i2i = i;"
          "int us2i = int(us);"
          "int ui2i = int(ui);"
          "int h2i = int(h);"
          "int f2i = int(f);"
-         "int d2fi = int(d);"
          "ushort s2us = ushort(s);"
          "ushort i2us = ushort(i);"
          "ushort us2us = us;"
          "ushort ui2us = ui;"
          "ushort h2us = ushort(h);"
          "ushort f2us = ushort(f);"
-         "ushort d2fus = ushort(d);"
          "uint s2ui = uint(s);"
          "uint i2ui = uint(i);"
          "uint us2ui = us;"
          "uint ui2ui = ui;"
          "uint h2ui = uint(h);"
          "uint f2ui = uint(f);"
-         "uint d2fui = uint(d);"
-         "float s2f = s;"
-         "float i2f = i;"
-         "float us2f = us;"
-         "float ui2f = ui;"
-         "float h2f = h;"
-         "float f2f = f;"
-         "float d2f = d;"
-         "double s2d = s;"
-         "double i2d = i;"
-         "double us2d = us;"
-         "double ui2d = ui;"
-         "double h2d = h;"
-         "double f2d = f;"
-         "double d2d = d;",
+         "highfloat s2f = s;"
+         "highfloat i2f = i;"
+         "highfloat us2f = us;"
+         "highfloat ui2f = ui;"
+         "highfloat h2f = h;"
+         "highfloat f2f = f;",
          *SkSL::ShaderCapsFactory::Default(),
          "#version 400\n"
          "out vec4 sk_FragColor;\n"
@@ -1558,49 +1545,67 @@
          "uint ui = uint(sqrt(1.0));\n"
          "float h = sqrt(1.0);\n"
          "float f = sqrt(1.0);\n"
-         "double d = sqrt(1.0);\n"
          "int s2s = s;\n"
          "int i2s = i;\n"
          "int us2s = int(us);\n"
          "int ui2s = int(ui);\n"
          "int h2s = int(h);\n"
          "int f2s = int(f);\n"
-         "int d2fs = int(d);\n"
          "int s2i = s;\n"
          "int i2i = i;\n"
          "int us2i = int(us);\n"
          "int ui2i = int(ui);\n"
          "int h2i = int(h);\n"
          "int f2i = int(f);\n"
-         "int d2fi = int(d);\n"
          "uint s2us = uint(s);\n"
          "uint i2us = uint(i);\n"
          "uint us2us = us;\n"
          "uint ui2us = ui;\n"
          "uint h2us = uint(h);\n"
          "uint f2us = uint(f);\n"
-         "uint d2fus = uint(d);\n"
          "uint s2ui = uint(s);\n"
          "uint i2ui = uint(i);\n"
          "uint us2ui = us;\n"
          "uint ui2ui = ui;\n"
          "uint h2ui = uint(h);\n"
          "uint f2ui = uint(f);\n"
-         "uint d2fui = uint(d);\n"
          "float s2f = float(s);\n"
          "float i2f = float(i);\n"
          "float us2f = float(us);\n"
          "float ui2f = float(ui);\n"
          "float h2f = h;\n"
-         "float f2f = f;\n"
-         "float d2f = d;\n"
-         "double s2d = double(s);\n"
-         "double i2d = double(i);\n"
-         "double us2d = double(us);\n"
-         "double ui2d = double(ui);\n"
-         "double h2d = h;\n"
-         "double f2d = f;\n"
-         "double d2d = d;\n");
+         "float f2f = f;\n");
+}
+
+DEF_TEST(SkSLForceHighPrecision, r) {
+    test(r,
+         "void main() { half x = sqrt(1); half4 y = half4(x); sk_FragColor = y; }",
+         *SkSL::ShaderCapsFactory::UsesPrecisionModifiers(),
+         "#version 400\n"
+         "precision mediump float;\n"
+         "out mediump vec4 sk_FragColor;\n"
+         "void main() {\n"
+         "    mediump float x = sqrt(1.0);\n"
+         "    mediump vec4 y = vec4(x);\n"
+         "    sk_FragColor = y;\n"
+         "}\n");
+    SkSL::Program::Settings settings;
+    settings.fForceHighPrecision = true;
+    sk_sp<GrShaderCaps> caps = SkSL::ShaderCapsFactory::UsesPrecisionModifiers();
+    settings.fCaps = caps.get();
+    SkSL::Program::Inputs inputs;
+    test(r,
+         "void main() { half x = sqrt(1); half4 y = half4(x); sk_FragColor = y; }",
+         settings,
+         "#version 400\n"
+         "precision mediump float;\n"
+         "out mediump vec4 sk_FragColor;\n"
+         "void main() {\n"
+         "    highp float x = sqrt(1.0);\n"
+         "    highp vec4 y = vec4(x);\n"
+         "    sk_FragColor = y;\n"
+         "}\n",
+         &inputs);
 }
 
 #endif