skslc now uses standard Skia caps

BUG=skia:

GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=4660

Change-Id: Idaedae3f81426b97f5052bb872cdf0610e47a84f
Reviewed-on: https://skia-review.googlesource.com/4660
Reviewed-by: Ben Wagner <benjaminwagner@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Ethan Nicholas <ethannicholas@google.com>
diff --git a/bench/GLBench.cpp b/bench/GLBench.cpp
index b697550..df9ee9b 100644
--- a/bench/GLBench.cpp
+++ b/bench/GLBench.cpp
@@ -71,7 +71,7 @@
                                                                     ? SkSL::Program::kVertex_Kind
                                                                     : SkSL::Program::kFragment_Kind,
                                               std::string(sksl),
-                                              GrGLSkSLCapsForContext(*context),
+                                              *context->caps()->glslCaps(),
                                               &glsl);
     if (!result) {
         SkDebugf("SkSL compilation failed:\n%s\n%s\n", sksl, 
diff --git a/fuzz/fuzz.cpp b/fuzz/fuzz.cpp
index d6534f1..9fc199e 100644
--- a/fuzz/fuzz.cpp
+++ b/fuzz/fuzz.cpp
@@ -397,7 +397,7 @@
     SkSL::Compiler compiler;
     std::string output;
     bool result = compiler.toGLSL(SkSL::Program::kFragment_Kind,
-        (const char*)bytes->data(), SkSL::GLCaps(), &output);
+        (const char*)bytes->data(), *SkSL::GLSLCapsFactory::Default(), &output);
 
     if (!result) {
         SkDebugf("[terminated] Couldn't compile input.\n");
diff --git a/gyp/sksl.gyp b/gyp/sksl.gyp
index c2fbbdd..5ec2979 100644
--- a/gyp/sksl.gyp
+++ b/gyp/sksl.gyp
@@ -12,7 +12,10 @@
       'include_dirs': [
          '../include/config',
          '../include/core',
+         '../include/gpu',
          '../include/private',
+         '../include/utils',
+         '../src/gpu',
          '../src/sksl',
       ],
       'defines': [
diff --git a/gyp/skslc.gyp b/gyp/skslc.gyp
index c465aa4..6f9ed60 100644
--- a/gyp/skslc.gyp
+++ b/gyp/skslc.gyp
@@ -13,13 +13,19 @@
       'include_dirs': [
          '../include/config',
          '../include/core',
+         '../include/gpu',
          '../include/private',
+         '../include/utils',
+         '../src/gpu',
          '../src/sksl',
       ],
       'sources': [
         '<!@(python read_gni.py ../gn/sksl.gni skia_sksl_sources)',
         '../src/sksl/SkSLMain.cpp',
       ],
+      'dependencies': [
+        'skia_lib.gyp:skia_lib',
+      ],
       'configurations': {
         'Debug': {
           'defines': [
diff --git a/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp b/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
index 8a5b700..1e42259 100644
--- a/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
+++ b/src/gpu/gl/builders/GrGLShaderStringBuilder.cpp
@@ -21,79 +21,6 @@
 
 static void print_shader_source(const char** strings, int* lengths, int count);
 
-SkSL::GLCaps GrGLSkSLCapsForContext(const GrGLContext& context) {
-    GrGLStandard standard = context.standard();
-    const GrGLCaps* caps = context.caps();
-    const GrGLSLCaps* glslCaps = caps->glslCaps();
-    SkSL::GLCaps result;
-    switch (standard) {
-        case kGL_GrGLStandard:
-            result.fStandard = SkSL::GLCaps::kGL_Standard;
-            break;
-        case kGLES_GrGLStandard:
-            result.fStandard = SkSL::GLCaps::kGLES_Standard;
-            break;
-        default:
-            SkASSERT(false);
-            result.fStandard = SkSL::GLCaps::kGL_Standard;
-    }
-
-    switch (glslCaps->generation()) {
-        case k110_GrGLSLGeneration:
-            if (kGLES_GrGLStandard == standard) {
-                // ES2's shader language is based on GLSL 1.20 but is version 1.00 of the ES 
-                // language
-                result.fVersion = 100;
-            } else {
-                SkASSERT(kGL_GrGLStandard == standard);
-                result.fVersion = 110;
-            }
-            break;
-        case k130_GrGLSLGeneration:
-            SkASSERT(kGL_GrGLStandard == standard);
-            result.fVersion = 130;
-            break;
-        case k140_GrGLSLGeneration:
-            SkASSERT(kGL_GrGLStandard == standard);
-            result.fVersion = 140;
-            break;
-        case k150_GrGLSLGeneration:
-            SkASSERT(kGL_GrGLStandard == standard);
-            result.fVersion = 150;
-            break;
-        case k330_GrGLSLGeneration:
-            if (kGLES_GrGLStandard == standard) {
-                result.fVersion = 300;
-            } else {
-                SkASSERT(kGL_GrGLStandard == standard);
-                result.fVersion = 330;
-            }
-            break;
-        case k400_GrGLSLGeneration:
-            SkASSERT(kGL_GrGLStandard == standard);
-            result.fVersion = 400;
-            break;
-        case k310es_GrGLSLGeneration:
-            SkASSERT(kGLES_GrGLStandard == standard);
-            result.fVersion = 310;
-            break;
-        case k320es_GrGLSLGeneration:
-            SkASSERT(kGLES_GrGLStandard == standard);
-            result.fVersion = 320;
-            break;
-    }
-    result.fIsCoreProfile = caps->isCoreProfile();
-    result.fUsesPrecisionModifiers = glslCaps->usesPrecisionModifiers();
-    result.fMustDeclareFragmentShaderOutput = glslCaps->mustDeclareFragmentShaderOutput();
-    result.fShaderDerivativeSupport = glslCaps->shaderDerivativeSupport();
-    if (result.fShaderDerivativeSupport && glslCaps->shaderDerivativeExtensionString()) {
-        result.fShaderDerivativeExtensionString = glslCaps->shaderDerivativeExtensionString();
-    }
-    result.fCanUseMinAndAbsTogether = glslCaps->canUseMinAndAbsTogether();
-    result.fMustForceNegatedAtanParamToFloat = glslCaps->mustForceNegatedAtanParamToFloat();
-    return result;
-}
-
 static void dump_string(std::string s) {
     // on Android, SkDebugf only displays the first 1K characters of output, which results in
     // incomplete shader source code. Print each line individually to avoid this problem.
@@ -137,13 +64,12 @@
 
     std::string glsl;
     SkSL::Compiler& compiler = *glCtx.compiler();
-    SkSL::GLCaps caps = GrGLSkSLCapsForContext(glCtx);
     SkASSERT(type == GR_GL_VERTEX_SHADER || type == GR_GL_FRAGMENT_SHADER);
     SkDEBUGCODE(bool result = )compiler.toGLSL(type == GR_GL_VERTEX_SHADER 
                                                                     ? SkSL::Program::kVertex_Kind
                                                                     : SkSL::Program::kFragment_Kind,
                                                std::string(sksl.c_str()),
-                                               caps,
+                                               *glCtx.caps()->glslCaps(),
                                                &glsl);
 #ifdef SK_DEBUG
     if (!result) {
diff --git a/src/gpu/gl/builders/GrGLShaderStringBuilder.h b/src/gpu/gl/builders/GrGLShaderStringBuilder.h
index 4365751..71fce6a 100644
--- a/src/gpu/gl/builders/GrGLShaderStringBuilder.h
+++ b/src/gpu/gl/builders/GrGLShaderStringBuilder.h
@@ -14,8 +14,6 @@
 #include "SkSLGLSLCodeGenerator.h"
 #include "SkTypes.h"
 
-SkSL::GLCaps GrGLSkSLCapsForContext(const GrGLContext& context);
-
 GrGLuint GrGLCompileAndAttachShader(const GrGLContext& glCtx,
                                     GrGLuint programId,
                                     GrGLenum type,
diff --git a/src/gpu/glsl/GrGLSLCaps.h b/src/gpu/glsl/GrGLSLCaps.h
index ac409a3..1a89d16 100644
--- a/src/gpu/glsl/GrGLSLCaps.h
+++ b/src/gpu/glsl/GrGLSLCaps.h
@@ -13,6 +13,10 @@
 #include "GrGLSL.h"
 #include "GrSwizzle.h"
 
+namespace SkSL {
+    class GLSLCapsFactory;
+}
+
 class GrGLSLCaps : public GrShaderCaps {
 public:
 
@@ -231,6 +235,7 @@
 
     friend class GrGLCaps;  // For initialization.
     friend class GrVkCaps;
+    friend class SkSL::GLSLCapsFactory;
 
     typedef GrShaderCaps INHERITED;
 };
diff --git a/src/sksl/SkSLCompiler.cpp b/src/sksl/SkSLCompiler.cpp
index c3adaea..27fd662 100644
--- a/src/sksl/SkSLCompiler.cpp
+++ b/src/sksl/SkSLCompiler.cpp
@@ -444,18 +444,18 @@
     return result;
 }
 
-bool Compiler::toGLSL(Program::Kind kind, const std::string& text, GLCaps caps,
+bool Compiler::toGLSL(Program::Kind kind, const std::string& text, const GrGLSLCaps& caps,
                       std::ostream& out) {
     auto program = this->convertProgram(kind, text);
     if (fErrorCount == 0) {
-        SkSL::GLSLCodeGenerator cg(&fContext, caps);
+        SkSL::GLSLCodeGenerator cg(&fContext, &caps);
         cg.generateCode(*program.get(), out);
         ASSERT(!out.rdstate());
     }
     return fErrorCount == 0;
 }
 
-bool Compiler::toGLSL(Program::Kind kind, const std::string& text, GLCaps caps,
+bool Compiler::toGLSL(Program::Kind kind, const std::string& text, const GrGLSLCaps& caps,
                       std::string* out) {
     std::stringstream buffer;
     bool result = this->toGLSL(kind, text, caps, buffer);
diff --git a/src/sksl/SkSLCompiler.h b/src/sksl/SkSLCompiler.h
index 275fc58..e69db59 100644
--- a/src/sksl/SkSLCompiler.h
+++ b/src/sksl/SkSLCompiler.h
@@ -43,9 +43,11 @@
     
     bool toSPIRV(Program::Kind kind, const std::string& text, std::string* out);
 
-    bool toGLSL(Program::Kind kind, const std::string& text, GLCaps caps, std::ostream& out);
+    bool toGLSL(Program::Kind kind, const std::string& text, const GrGLSLCaps& caps,
+                std::ostream& out);
     
-    bool toGLSL(Program::Kind kind, const std::string& text, GLCaps caps, std::string* out);
+    bool toGLSL(Program::Kind kind, const std::string& text, const GrGLSLCaps& caps,
+                std::string* out);
 
     void error(Position position, std::string msg) override;
 
diff --git a/src/sksl/SkSLGLSLCodeGenerator.cpp b/src/sksl/SkSLGLSLCodeGenerator.cpp
index 8a26f6a..c6d2e6e 100644
--- a/src/sksl/SkSLGLSLCodeGenerator.cpp
+++ b/src/sksl/SkSLGLSLCodeGenerator.cpp
@@ -137,7 +137,7 @@
 // turns min(abs(x), y) into ((tmpVar1 = abs(x)) < (tmpVar2 = y) ? tmpVar1 : tmpVar2) to avoid a 
 // Tegra3 compiler bug.
 void GLSLCodeGenerator::writeMinAbsHack(Expression& absExpr, Expression& otherExpr) {
-    ASSERT(!fCaps.fCanUseMinAndAbsTogether);
+    ASSERT(!fCaps.canUseMinAndAbsTogether());
     std::string tmpVar1 = "minAbsHackVar" + to_string(fVarCount++);
     std::string tmpVar2 = "minAbsHackVar" + to_string(fVarCount++);
     this->fFunctionHeader += "    " + absExpr.fType.name() + " " + tmpVar1 + ";\n";
@@ -150,7 +150,7 @@
 }
 
 void GLSLCodeGenerator::writeFunctionCall(const FunctionCall& c) {
-    if (!fCaps.fCanUseMinAndAbsTogether && c.fFunction.fName == "min" && c.fFunction.fBuiltin) {
+    if (!fCaps.canUseMinAndAbsTogether() && c.fFunction.fName == "min" && c.fFunction.fBuiltin) {
         ASSERT(c.fArguments.size() == 2);
         if (is_abs(*c.fArguments[0])) {
             this->writeMinAbsHack(*c.fArguments[0], *c.fArguments[1]);
@@ -163,7 +163,7 @@
             return;
         }
     }
-    if (fCaps.fMustForceNegatedAtanParamToFloat && c.fFunction.fName == "atan" && 
+    if (fCaps.mustForceNegatedAtanParamToFloat() && c.fFunction.fName == "atan" && 
         c.fFunction.fBuiltin && c.fArguments.size() == 2 && 
         c.fArguments[1]->fKind == Expression::kPrefix_Kind) {
         const PrefixExpression& p = (PrefixExpression&) *c.fArguments[1];
@@ -176,10 +176,10 @@
             return;
         }
     }
-    if (!fFoundDerivatives && fCaps.fShaderDerivativeExtensionString != "" && 
-        (c.fFunction.fName == "dFdx" || c.fFunction.fName == "dFdy") && c.fFunction.fBuiltin) {
-        ASSERT(fCaps.fShaderDerivativeSupport);
-        fHeader << "#extension " << fCaps.fShaderDerivativeExtensionString << " : require\n";
+    if (!fFoundDerivatives && (c.fFunction.fName == "dFdx" || c.fFunction.fName == "dFdy") && 
+        c.fFunction.fBuiltin && fCaps.shaderDerivativeExtensionString()) {
+        ASSERT(fCaps.shaderDerivativeSupport());
+        fHeader << "#extension " << fCaps.shaderDerivativeExtensionString() << " : require\n";
         fFoundDerivatives = true;
     }
     this->write(c.fFunction.fName + "(");
@@ -205,7 +205,7 @@
 
 void GLSLCodeGenerator::writeVariableReference(const VariableReference& ref) {
     if (ref.fVariable.fModifiers.fLayout.fBuiltin == SK_FRAGCOLOR_BUILTIN) {
-        if (fCaps.fMustDeclareFragmentShaderOutput) {
+        if (fCaps.mustDeclareFragmentShaderOutput()) {
             this->write("sk_FragColor");
         } else {
             this->write("gl_FragColor");
@@ -405,14 +405,14 @@
         (modifiers.fFlags & Modifiers::kOut_Flag)) {
         this->write("inout ");
     } else if (modifiers.fFlags & Modifiers::kIn_Flag) {
-        if (globalContext && fCaps.fVersion < 130) {
+        if (globalContext && fCaps.generation() < GrGLSLGeneration::k130_GrGLSLGeneration) {
             this->write(fProgramKind == Program::kVertex_Kind ? "attribute "
                                                               : "varying ");
         } else {
             this->write("in ");
         }
     } else if (modifiers.fFlags & Modifiers::kOut_Flag) {
-        if (globalContext && fCaps.fVersion < 130) {
+        if (globalContext && fCaps.generation() < GrGLSLGeneration::k130_GrGLSLGeneration) {
             this->write("varying ");
         } else {
             this->write("out ");
@@ -424,7 +424,7 @@
     if (modifiers.fFlags & Modifiers::kConst_Flag) {
         this->write("const ");
     }
-    if (fCaps.fUsesPrecisionModifiers) {
+    if (fCaps.usesPrecisionModifiers()) {
         if (modifiers.fFlags & Modifiers::kLowp_Flag) {
             this->write("lowp ");
         }
@@ -587,12 +587,7 @@
     ASSERT(fOut == nullptr);
     fOut = &fHeader;
     fProgramKind = program.fKind;
-    this->write("#version " + to_string(fCaps.fVersion));
-    if (fCaps.fStandard == GLCaps::kGLES_Standard && fCaps.fVersion >= 300) {
-        this->write(" es");
-    } else if (fCaps.fIsCoreProfile) {
-        this->write(" core");
-    }
+    this->write(fCaps.versionDeclString());
     this->writeLine();
     for (const auto& e : program.fElements) {
         if (e->fKind == ProgramElement::kExtension_Kind) {
@@ -601,7 +596,7 @@
     }
     std::stringstream body;
     fOut = &body;
-    if (fCaps.fStandard == GLCaps::kGLES_Standard) {
+    if (fCaps.usesPrecisionModifiers()) {
         this->write("precision ");
         switch (program.fDefaultPrecision) {
             case Modifiers::kLowp_Flag:
@@ -632,9 +627,9 @@
                         this->writeVarDeclarations(decl, true);
                         this->writeLine();
                     } else if (builtin == SK_FRAGCOLOR_BUILTIN &&
-                               fCaps.fMustDeclareFragmentShaderOutput) {
+                               fCaps.mustDeclareFragmentShaderOutput()) {
                         this->write("out ");
-                        if (fCaps.fUsesPrecisionModifiers) {
+                        if (fCaps.usesPrecisionModifiers()) {
                             this->write("mediump ");
                         }
                         this->writeLine("vec4 sk_FragColor;");
diff --git a/src/sksl/SkSLGLSLCodeGenerator.h b/src/sksl/SkSLGLSLCodeGenerator.h
index 97e6038..5ed6104 100644
--- a/src/sksl/SkSLGLSLCodeGenerator.h
+++ b/src/sksl/SkSLGLSLCodeGenerator.h
@@ -12,6 +12,7 @@
 #include <tuple>
 #include <unordered_map>
 
+#include "glsl/GrGLSLCaps.h"
 #include "SkSLCodeGenerator.h"
 #include "ir/SkSLBinaryExpression.h"
 #include "ir/SkSLBoolLiteral.h"
@@ -44,28 +45,6 @@
 
 #define kLast_Capability SpvCapabilityMultiViewport
 
-struct GLCaps {
-    GLCaps() {}
-
-    int fVersion = 400;
-    enum {
-        kGL_Standard,
-        kGLES_Standard
-    } fStandard = kGL_Standard;
-    bool fIsCoreProfile = false;
-    bool fUsesPrecisionModifiers = false;
-    bool fMustDeclareFragmentShaderOutput = false;
-    bool fShaderDerivativeSupport = true;
-    // extension string to enable derivative support, or null if unnecessary
-    std::string fShaderDerivativeExtensionString;
-    // The Tegra3 compiler will sometimes never return if we have min(abs(x), y)
-    bool fCanUseMinAndAbsTogether = true;
-    // On Intel GPU there is an issue where it misinterprets an atan argument (second argument only,
-    // apparently) of the form "-<expr>" as an int, so we rewrite it as "-1.0 * <expr>" to avoid
-    // this problem
-    bool fMustForceNegatedAtanParamToFloat = false;
-};
-
 /**
  * Converts a Program into GLSL code.
  */
@@ -92,9 +71,9 @@
         kTopLevel_Precedence       = 18
     };
 
-    GLSLCodeGenerator(const Context* context, GLCaps caps)
+    GLSLCodeGenerator(const Context* context, const GrGLSLCaps* caps)
     : fContext(*context)
-    , fCaps(caps) {}
+    , fCaps(*caps) {}
 
     void generateCode(const Program& program, std::ostream& out) override;
 
@@ -176,7 +155,7 @@
     void writeReturnStatement(const ReturnStatement& r);
 
     const Context& fContext;
-    const GLCaps fCaps;
+    const GrGLSLCaps& fCaps;
     std::ostream* fOut = nullptr;
     std::stringstream fHeader;
     std::string fFunctionHeader;
diff --git a/src/sksl/SkSLMain.cpp b/src/sksl/SkSLMain.cpp
index eb07b4d..3658992 100644
--- a/src/sksl/SkSLMain.cpp
+++ b/src/sksl/SkSLMain.cpp
@@ -8,6 +8,7 @@
 #include "stdio.h"
 #include <fstream>
 #include "SkSLCompiler.h"
+#include "GrContextOptions.h"
 
 bool endsWith(const std::string& s, const std::string& ending) {
     if (s.length() >= ending.length()) {
@@ -57,7 +58,7 @@
     } else if (endsWith(name, ".glsl")) {
         std::ofstream out(argv[2], std::ofstream::binary);
         SkSL::Compiler compiler;
-        if (!compiler.toGLSL(kind, text, SkSL::GLCaps(), out)) {
+        if (!compiler.toGLSL(kind, text, *SkSL::GLSLCapsFactory::Default(), out)) {
             printf("%s", compiler.errorText().c_str());
             exit(3);
         }
diff --git a/src/sksl/SkSLUtil.h b/src/sksl/SkSLUtil.h
index efffaae..ede2183 100644
--- a/src/sksl/SkSLUtil.h
+++ b/src/sksl/SkSLUtil.h
@@ -13,10 +13,66 @@
 #include <sstream>
 #include "stdlib.h"
 #include "assert.h"
-#include "SkTypes.h"    
+#include "SkRefCnt.h"
+#include "SkTypes.h"
+#include "glsl/GrGLSLCaps.h"
+#include "GrContextOptions.h"
 
 namespace SkSL {
 
+// Various sets of caps for use in tests
+class GLSLCapsFactory {
+public:
+    static sk_sp<GrGLSLCaps> Default() {
+        sk_sp<GrGLSLCaps> result = sk_make_sp<GrGLSLCaps>(GrContextOptions());
+        result->fVersionDeclString = "#version 400";
+        result->fShaderDerivativeSupport = true;
+        return result;
+    }
+
+    static sk_sp<GrGLSLCaps> Version450Core() {
+        sk_sp<GrGLSLCaps> result = sk_make_sp<GrGLSLCaps>(GrContextOptions());
+        result->fVersionDeclString = "#version 450 core";
+        return result;
+    }
+
+    static sk_sp<GrGLSLCaps> Version110() {
+        sk_sp<GrGLSLCaps> result = sk_make_sp<GrGLSLCaps>(GrContextOptions());
+        result->fVersionDeclString = "#version 110";
+        result->fGLSLGeneration = GrGLSLGeneration::k110_GrGLSLGeneration;
+        return result;
+    }
+
+    static sk_sp<GrGLSLCaps> UsesPrecisionModifiers() {
+        sk_sp<GrGLSLCaps> result = sk_make_sp<GrGLSLCaps>(GrContextOptions());
+        result->fVersionDeclString = "#version 400";
+        result->fUsesPrecisionModifiers = true;
+        return result;
+    }
+
+    static sk_sp<GrGLSLCaps> CannotUseMinAndAbsTogether() {
+        sk_sp<GrGLSLCaps> result = sk_make_sp<GrGLSLCaps>(GrContextOptions());
+        result->fVersionDeclString = "#version 400";
+        result->fCanUseMinAndAbsTogether = false;
+        return result;
+    }
+
+    static sk_sp<GrGLSLCaps> MustForceNegatedAtanParamToFloat() {
+        sk_sp<GrGLSLCaps> result = sk_make_sp<GrGLSLCaps>(GrContextOptions());
+        result->fVersionDeclString = "#version 400";
+        result->fMustForceNegatedAtanParamToFloat = true;
+        return result;
+    }
+
+    static sk_sp<GrGLSLCaps> ShaderDerivativeExtensionString() {
+        sk_sp<GrGLSLCaps> result = sk_make_sp<GrGLSLCaps>(GrContextOptions());
+        result->fVersionDeclString = "#version 400";
+        result->fShaderDerivativeSupport = true;
+        result->fShaderDerivativeExtensionString = "GL_OES_standard_derivatives";
+        return result;
+    }
+};
+
 // our own definitions of certain std:: functions, because they are not always present on Android
 
 std::string to_string(double value);
diff --git a/tests/SkSLGLSLTest.cpp b/tests/SkSLGLSLTest.cpp
index 38fce87..937fd67 100644
--- a/tests/SkSLGLSLTest.cpp
+++ b/tests/SkSLGLSLTest.cpp
@@ -9,7 +9,8 @@
 
 #include "Test.h"
 
-static void test(skiatest::Reporter* r, const char* src, SkSL::GLCaps caps, const char* expected) {
+static void test(skiatest::Reporter* r, const char* src, const GrGLSLCaps& caps, 
+                 const char* expected) {
     SkSL::Compiler compiler;
     std::string output;
     bool result = compiler.toGLSL(SkSL::Program::kFragment_Kind, src, caps, &output);
@@ -26,17 +27,14 @@
     }
 }
 
-static SkSL::GLCaps default_caps() {
-    return SkSL::GLCaps();
-}
-
 DEF_TEST(SkSLHelloWorld, r) {
     test(r,
          "void main() { sk_FragColor = vec4(0.75); }",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
-         "    gl_FragColor = vec4(0.75);\n"
+         "    sk_FragColor = vec4(0.75);\n"
          "}\n");
 }
 
@@ -52,19 +50,20 @@
          "}"
          "return;"
          "}",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    if (sqrt(2.0) > 5.0) {\n"
-         "        gl_FragColor = vec4(0.75);\n"
+         "        sk_FragColor = vec4(0.75);\n"
          "    } else {\n"
          "        discard;\n"
          "    }\n"
          "    int i = 0;\n"
-         "    while (i < 10) gl_FragColor *= 0.5;\n"
+         "    while (i < 10) sk_FragColor *= 0.5;\n"
          "    do {\n"
-         "        gl_FragColor += 0.01;\n"
-         "    } while (gl_FragColor.x < 0.7);\n"
+         "        sk_FragColor += 0.01;\n"
+         "    } while (sk_FragColor.x < 0.7);\n"
          "    for (int i = 0;i < 10; i++) {\n"
          "        if (i % 0 == 1) break; else continue;\n"
          "    }\n"
@@ -77,8 +76,9 @@
          "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 = vec4(x); }",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "float foo(in float v[2]) {\n"
          "    return v[0] * v[1];\n"
          "}\n"
@@ -92,7 +92,7 @@
          "void main() {\n"
          "    float x = 10.0;\n"
          "    bar(x);\n"
-         "    gl_FragColor = vec4(x);\n"
+         "    sk_FragColor = vec4(x);\n"
          "}\n");
 }
 
@@ -118,8 +118,9 @@
          "z <<= 4;"
          "z %= 5;"
          "}",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    float x = 1.0, y = 2.0;\n"
          "    int z = 3;\n"
@@ -151,8 +152,9 @@
          "vec3 v1 = mat3(1) * vec3(1);"
          "vec3 v2 = vec3(1) * mat3(1);"
          "}",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    mat2x4 x = mat2x4(1.0);\n"
          "    mat3x2 y = mat3x2(1.0, 0.0, 0.0, 1.0, vec2(2.0, 2.0));\n"
@@ -172,8 +174,9 @@
          "};"
          "void main() {"
          "}",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "uniform testBlock {\n"
          "    float x;\n"
          "    float[2] y;\n"
@@ -199,8 +202,9 @@
          "B b1, b2, b3;"
          "void main() {"
          "}",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "struct A {\n"
          "    int x;\n"
          "    int y;\n"
@@ -218,22 +222,18 @@
 }
 
 DEF_TEST(SkSLVersion, r) {
-    SkSL::GLCaps caps = default_caps();
-    caps.fVersion = 450;
-    caps.fIsCoreProfile = true;
     test(r,
          "in float test; void main() { sk_FragColor = vec4(0.75); }",
-         caps,
+         *SkSL::GLSLCapsFactory::Version450Core(),
          "#version 450 core\n"
+         "out vec4 sk_FragColor;\n"
          "in float test;\n"
          "void main() {\n"
-         "    gl_FragColor = vec4(0.75);\n"
+         "    sk_FragColor = vec4(0.75);\n"
          "}\n");
-    caps.fVersion = 110;
-    caps.fIsCoreProfile = false;
     test(r,
          "in float test; void main() { sk_FragColor = vec4(0.75); }",
-         caps,
+         *SkSL::GLSLCapsFactory::Version110(),
          "#version 110\n"
          "varying float test;\n"
          "void main() {\n"
@@ -241,36 +241,22 @@
          "}\n");
 }
 
-DEF_TEST(SkSLDeclareOutput, r) {
-    SkSL::GLCaps caps = default_caps();    
-    caps.fMustDeclareFragmentShaderOutput = true;
-    test(r,
-         "void main() { sk_FragColor = vec4(0.75); }",
-         caps,
-         "#version 400\n"
-         "out vec4 sk_FragColor;\n"
-         "void main() {\n"
-         "    sk_FragColor = vec4(0.75);\n"
-         "}\n");    
-}
-
 DEF_TEST(SkSLUsesPrecisionModifiers, r) {
-    SkSL::GLCaps caps = default_caps();
     test(r,
          "void main() { float x = 0.75; highp float y = 1; }",
-         caps,
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    float x = 0.75;\n"
          "    float y = 1.0;\n"
          "}\n");    
-    caps.fStandard = SkSL::GLCaps::kGLES_Standard;
-    caps.fUsesPrecisionModifiers = true;
     test(r,
          "void main() { float x = 0.75; highp float y = 1; }",
-         caps,
-         "#version 400 es\n"
+         *SkSL::GLSLCapsFactory::UsesPrecisionModifiers(),
+         "#version 400\n"
          "precision highp float;\n"
+         "out mediump vec4 sk_FragColor;\n"
          "void main() {\n"
          "    float x = 0.75;\n"
          "    highp float y = 1.0;\n"
@@ -283,22 +269,22 @@
          "float x = -5;"
          "x = min(abs(x), 6);"
          "}",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    float x = -5.0;\n"
          "    x = min(abs(x), 6.0);\n"
          "}\n");
 
-    SkSL::GLCaps caps = default_caps();
-    caps.fCanUseMinAndAbsTogether = false;
     test(r,
          "void main() {"
          "float x = -5.0;"
          "x = min(abs(x), 6.0);"
          "}",
-         caps,
+         *SkSL::GLSLCapsFactory::CannotUseMinAndAbsTogether(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    float minAbsHackVar0;\n"
          "    float minAbsHackVar1;\n"
@@ -311,18 +297,18 @@
 DEF_TEST(SkSLNegatedAtan, r) {
     test(r,
          "void main() { vec2 x = vec2(1, 2); float y = atan(x.x, -(2 * x.y)); }",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    vec2 x = vec2(1.0, 2.0);\n"
          "    float y = atan(x.x, -(2.0 * x.y));\n"
          "}\n");
-    SkSL::GLCaps caps = default_caps();
-    caps.fMustForceNegatedAtanParamToFloat = true;
     test(r,
          "void main() { vec2 x = vec2(1, 2); float y = atan(x.x, -(2 * x.y)); }",
-         caps,
+         *SkSL::GLSLCapsFactory::MustForceNegatedAtanParamToFloat(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    vec2 x = vec2(1.0, 2.0);\n"
          "    float y = atan(x.x, -1.0 * (2.0 * x.y));\n"
@@ -333,8 +319,9 @@
     test(r,
          "layout(blend_support_all_equations) out;"
          "void main() { }",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "layout (blend_support_all_equations) out ;\n"
          "void main() {\n"
          "}\n");
@@ -353,8 +340,9 @@
          "uint u3 = 0x7fffffff;"
          "uint u4 = 0xffffffff;"
          "}",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    int i1 = 0;\n"
          "    int i2 = 305441741;\n"
@@ -379,8 +367,9 @@
          "ivec2 v7 = ivec2(1);"
          "ivec2 v8 = ivec2(vec2(1, 2));"
          "vec2 v9 = vec2(ivec2(1, 2));",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "vec2 v1 = vec2(1.0);\n"
          "vec2 v2 = vec2(1.0, 2.0);\n"
          "vec2 v3 = vec2(1.0);\n"
@@ -397,8 +386,9 @@
          "float test1[] = float[](1, 2, 3, 4);"
          "vec2 test2[] = vec2[](vec2(1, 2), vec2(3, 4));"
          "mat4 test3[] = mat4[]();",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "float test1[] = float[](1.0, 2.0, 3.0, 4.0);\n"
          "vec2 test2[] = vec2[](vec2(1.0, 2.0), vec2(3.0, 4.0));\n"
          "mat4 test3[] = mat4[]();\n");
@@ -407,25 +397,26 @@
 DEF_TEST(SkSLDerivatives, r) {
     test(r,
          "void main() { float x = dFdx(1); }",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    float x = dFdx(1.0);\n"
          "}\n");
-    SkSL::GLCaps caps = default_caps();
-    caps.fShaderDerivativeExtensionString = "GL_OES_standard_derivatives";
     test(r,
          "void main() { float x = 1; }",
-         caps,
+         *SkSL::GLSLCapsFactory::ShaderDerivativeExtensionString(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    float x = 1.0;\n"
          "}\n");
     test(r,
          "void main() { float x = dFdx(1); }",
-         caps,
+         *SkSL::GLSLCapsFactory::ShaderDerivativeExtensionString(),
          "#version 400\n"
          "#extension GL_OES_standard_derivatives : require\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    float x = dFdx(1.0);\n"
          "}\n");
@@ -468,8 +459,9 @@
          "bool xor_f = 1 == 1 ^^ 1 == 1;"
          "int ternary = 10 > 5 ? 10 : 5;"
          "}",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    float f_add = 34.0;\n"
          "    float f_sub = 30.0;\n"
@@ -516,8 +508,9 @@
          "if (1 > 2) x = 4; else x = 5;"
          "if (false) x = 6;"
          "}",
-         default_caps(),
+         *SkSL::GLSLCapsFactory::Default(),
          "#version 400\n"
+         "out vec4 sk_FragColor;\n"
          "void main() {\n"
          "    int x;\n"
          "    x = 1;\n"