Implement ES 2,3 parts of EXT_blend_func_extended for shader translation
Exposes gl_SecondaryFragColor, glSecondaryFragData[] and
gl_MaxDualSourceDrawBuffers to GLES SL 1.0.
Relaxes rules for undefined output locations for GLES SL 3.0
and exposes gl_MaxDualSourceDrawBuffers.
If the output GL context is GL ES 2.0 or 3.0:
The emulation layer is expected to turn on EXT_blend_func_extended
if the output GL context supports it.
If the output GL context is GL:
The emulation layer is expected to turn on EXT_blend_func_extended
if the output GL context supports ARB_blend_func_extended or if GL
context is 3.2 or later.
If the source shader spec is GLES SL 2.0: The emulation layer is
expected to inspect the shader compilation output variables upon
linking. If output target is GL SL, the emulation layer should bind
color location 0, index 1 to "angle_SecondaryFragColor" if variable
"gl_SecondaryFragColorEXT" is used. Alternatively, emulation layer
should bind "angle_SecondaryFragData" to locations 0,1,2,3,..., all
color index 1, if "gl_SecondaryFragData" array is used.
(The caller can not bind the locations or specify output variables.)
If the source shader spec is GLES SL 3.0:
The emulation layer is expected to do location auto-resolve of the
the output variables that have undefined output locations that have
not been bound by the caller.
(The caller can not use gl_ built-ins, so nothing to do with those.)
BUG=angleproject:1085
TEST=angle_unittest
Change-Id: I5cafe205b0c29478b0dcd24aa89a7b0000f5d046
Reviewed-on: https://chromium-review.googlesource.com/287580
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Kimmo Kinnunen <kkinnunen@nvidia.com>
diff --git a/src/compiler/translator/VariableInfo.cpp b/src/compiler/translator/VariableInfo.cpp
index c1c4c2d..d61dc40 100644
--- a/src/compiler/translator/VariableInfo.cpp
+++ b/src/compiler/translator/VariableInfo.cpp
@@ -151,6 +151,8 @@
mFragColorAdded(false),
mFragDataAdded(false),
mFragDepthAdded(false),
+ mSecondaryFragColorEXTAdded(false),
+ mSecondaryFragDataEXTAdded(false),
mHashFunction(hashFunction),
mSymbolTable(symbolTable)
{
@@ -420,6 +422,39 @@
mFragDepthAdded = true;
}
return;
+ case EvqSecondaryFragColorEXT:
+ if (!mSecondaryFragColorEXTAdded)
+ {
+ Attribute info;
+ const char kName[] = "gl_SecondaryFragColorEXT";
+ info.name = kName;
+ info.mappedName = kName;
+ info.type = GL_FLOAT_VEC4;
+ info.arraySize = 0;
+ info.precision = GL_MEDIUM_FLOAT; // Defined by spec.
+ info.staticUse = true;
+ mOutputVariables->push_back(info);
+ mSecondaryFragColorEXTAdded = true;
+ }
+ return;
+ case EvqSecondaryFragDataEXT:
+ if (!mSecondaryFragDataEXTAdded)
+ {
+ Attribute info;
+ const char kName[] = "gl_SecondaryFragDataEXT";
+ info.name = kName;
+ info.mappedName = kName;
+ info.type = GL_FLOAT_VEC4;
+
+ const TVariable *maxDualSourceDrawBuffersVar = static_cast<const TVariable *>(
+ mSymbolTable.findBuiltIn("gl_MaxDualSourceDrawBuffersEXT", 100));
+ info.arraySize = maxDualSourceDrawBuffersVar->getConstPointer()->getIConst();
+ info.precision = GL_MEDIUM_FLOAT; // Defined by spec.
+ info.staticUse = true;
+ mOutputVariables->push_back(info);
+ mSecondaryFragDataEXTAdded = true;
+ }
+ return;
default:
break;
}