kc3-lang/angle/src/libANGLE/renderer/gl/ShaderGL.cpp

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• Author : Geoff Lang
  Date : 2015-05-27 15:15:41
  Hash : 6db25f15
  Message : Always init gl_Position in vertex shaders in ShaderGL. Fixes: * conformance/glsl/misc/empty_main.vert.html * conformance/glsl/misc/gl_position_unset.vert.html BUG=angleproject:882 Change-Id: I92a465b58f319b14e4f697d9bb5b45427a6247c0 Reviewed-on: https://chromium-review.googlesource.com/273548 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>

• src/libANGLE/renderer/gl/ShaderGL.cpp

• //
  // Copyright 2015 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.
  //
  
  // ShaderGL.cpp: Implements the class methods for ShaderGL.
  
  #include "libANGLE/renderer/gl/ShaderGL.h"
  
  #include "common/debug.h"
  #include "libANGLE/Compiler.h"
  #include "libANGLE/renderer/gl/CompilerGL.h"
  #include "libANGLE/renderer/gl/FunctionsGL.h"
  
  template <typename VarT>
  static std::vector<VarT> GetFilteredShaderVariables(const std::vector<VarT> *variableList)
  {
      ASSERT(variableList);
      std::vector<VarT> result;
      for (size_t varIndex = 0; varIndex < variableList->size(); varIndex++)
      {
          const VarT &var = variableList->at(varIndex);
          if (var.staticUse)
          {
              result.push_back(var);
          }
      }
      return result;
  }
  
  template <typename VarT>
  static const std::vector<VarT> &GetShaderVariables(const std::vector<VarT> *variableList)
  {
      ASSERT(variableList);
      return *variableList;
  }
  
  namespace rx
  {
  
  ShaderGL::ShaderGL(GLenum type, const FunctionsGL *functions)
      : ShaderImpl(),
        mFunctions(functions),
        mType(type),
        mShaderID(0)
  {
      ASSERT(mFunctions);
  }
  
  ShaderGL::~ShaderGL()
  {
      if (mShaderID != 0)
      {
          mFunctions->deleteShader(mShaderID);
          mShaderID = 0;
      }
  }
  
  bool ShaderGL::compile(gl::Compiler *compiler, const std::string &source)
  {
      // Reset the previous state
      mActiveAttributes.clear();
      mVaryings.clear();
      mUniforms.clear();
      mInterfaceBlocks.clear();
      mActiveOutputVariables.clear();
      if (mShaderID != 0)
      {
          mFunctions->deleteShader(mShaderID);
          mShaderID = 0;
      }
  
      // Translate the ESSL into GLSL
      CompilerGL *compilerGL = GetImplAs<CompilerGL>(compiler);
      ShHandle compilerHandle = compilerGL->getCompilerHandle(mType);
  
      int compileOptions = (SH_OBJECT_CODE | SH_VARIABLES | SH_INIT_GL_POSITION);
      const char* sourceCString = source.c_str();
      if (!ShCompile(compilerHandle, &sourceCString, 1, compileOptions))
      {
          mInfoLog = ShGetInfoLog(compilerHandle);
          TRACE("\n%s", mInfoLog.c_str());
          return false;
      }
  
      mTranslatedSource = ShGetObjectCode(compilerHandle);
      const char* translatedSourceCString = mTranslatedSource.c_str();
  
      // Generate a shader object and set the source
      mShaderID = mFunctions->createShader(mType);
      mFunctions->shaderSource(mShaderID, 1, &translatedSourceCString, nullptr);
      mFunctions->compileShader(mShaderID);
  
      // Check for compile errors from the native driver
      GLint compileStatus = GL_FALSE;
      mFunctions->getShaderiv(mShaderID, GL_COMPILE_STATUS, &compileStatus);
      ASSERT(compileStatus == GL_TRUE);
      if (compileStatus == GL_FALSE)
      {
          // Compilation failed, put the error into the info log
          GLint infoLogLength = 0;
          mFunctions->getShaderiv(mShaderID, GL_INFO_LOG_LENGTH, &infoLogLength);
  
          std::vector<char> buf(infoLogLength);
          mFunctions->getShaderInfoLog(mShaderID, infoLogLength, nullptr, &buf[0]);
  
          mFunctions->deleteShader(mShaderID);
          mShaderID = 0;
  
          mInfoLog = &buf[0];
          TRACE("\n%s", mInfoLog.c_str());
          return false;
      }
  
      // Gather the shader information
      // TODO: refactor this out, gathering of the attributes, varyings and outputs should be done
      // at the gl::Shader level
      if (mType == GL_VERTEX_SHADER)
      {
          mActiveAttributes = GetFilteredShaderVariables(ShGetAttributes(compilerHandle));
      }
  
      const std::vector<sh::Varying> &varyings = GetShaderVariables(ShGetVaryings(compilerHandle));
      for (size_t varyingIndex = 0; varyingIndex < varyings.size(); varyingIndex++)
      {
          mVaryings.push_back(gl::PackedVarying(varyings[varyingIndex]));
      }
  
      mUniforms = GetShaderVariables(ShGetUniforms(compilerHandle));
      mInterfaceBlocks = GetShaderVariables(ShGetInterfaceBlocks(compilerHandle));
  
      if (mType == GL_FRAGMENT_SHADER)
      {
          mActiveOutputVariables = GetFilteredShaderVariables(ShGetOutputVariables(compilerHandle));
      }
  
      return true;
  }
  
  std::string ShaderGL::getDebugInfo() const
  {
      return std::string();
  }
  
  GLuint ShaderGL::getShaderID() const
  {
      return mShaderID;
  }
  
  }