kc3-lang/angle/src/compiler/translator/OutputGLSL.cpp

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• Author : Kimmo Kinnunen
  Date : 2015-07-16 14:13:11
  Hash : b18609b9
  Message : 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>

• src/compiler/translator/OutputGLSL.cpp

• //
  // Copyright (c) 2002-2013 The ANGLE Project Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  //
  
  #include "compiler/translator/OutputGLSL.h"
  
  TOutputGLSL::TOutputGLSL(TInfoSinkBase& objSink,
                           ShArrayIndexClampingStrategy clampingStrategy,
                           ShHashFunction64 hashFunction,
                           NameMap& nameMap,
                           TSymbolTable& symbolTable,
                           int shaderVersion,
                           ShShaderOutput output)
      : TOutputGLSLBase(objSink,
                        clampingStrategy,
                        hashFunction,
                        nameMap,
                        symbolTable,
                        shaderVersion,
                        output)
  {
  }
  
  bool TOutputGLSL::writeVariablePrecision(TPrecision)
  {
      return false;
  }
  
  void TOutputGLSL::visitSymbol(TIntermSymbol *node)
  {
      TInfoSinkBase& out = objSink();
  
      const TString &symbol = node->getSymbol();
      if (symbol == "gl_FragDepthEXT")
      {
          out << "gl_FragDepth";
      }
      else if (symbol == "gl_FragColor" && IsGLSL130OrNewer(getShaderOutput()))
      {
          out << "webgl_FragColor";
      }
      else if (symbol == "gl_FragData" && IsGLSL130OrNewer(getShaderOutput()))
      {
          out << "webgl_FragData";
      }
      else if (symbol == "gl_SecondaryFragColorEXT")
      {
          out << "angle_SecondaryFragColor";
      }
      else if (symbol == "gl_SecondaryFragDataEXT")
      {
          out << "angle_SecondaryFragData";
      }
      else
      {
          TOutputGLSLBase::visitSymbol(node);
      }
  }
  
  TString TOutputGLSL::translateTextureFunction(TString &name)
  {
      static const char *simpleRename[] = {
          "texture2DLodEXT", "texture2DLod",
          "texture2DProjLodEXT", "texture2DProjLod",
          "textureCubeLodEXT", "textureCubeLod",
          "texture2DGradEXT", "texture2DGradARB",
          "texture2DProjGradEXT", "texture2DProjGradARB",
          "textureCubeGradEXT", "textureCubeGradARB",
          NULL, NULL
      };
      static const char *legacyToCoreRename[] = {
          "texture2D", "texture",
          "texture2DProj", "textureProj",
          "texture2DLod", "textureLod",
          "texture2DProjLod", "textureProjLod",
          "textureCube", "texture",
          "textureCubeLod", "textureLod",
          // Extensions
          "texture2DLodEXT", "textureLod",
          "texture2DProjLodEXT", "textureProjLod",
          "textureCubeLodEXT", "textureLod",
          "texture2DGradEXT", "textureGrad",
          "texture2DProjGradEXT", "textureProjGrad",
          "textureCubeGradEXT", "textureGrad",
          NULL, NULL
      };
      const char **mapping = (IsGLSL130OrNewer(getShaderOutput())) ?
          legacyToCoreRename : simpleRename;
  
      for (int i = 0; mapping[i] != NULL; i += 2)
      {
          if (name == mapping[i])
          {
              return mapping[i+1];
          }
      }
  
      return name;
  }