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

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• Hash : 0690e1aa
  Author :
  Date : 2017-12-21T20:51:38
  

  Add a workaround to clamp gl_FragDepth
  
  NVIDIA OpenGL drivers at least up to version 388.59 don't clamp
  gl_FragDepth when it is written to a floating point depth buffer.
  This bug is now worked around by clamping gl_FragDepth in the shader
  if it is statically used.
  
  BUG=angleproject:2299
  TEST=angle_end2end_tests on NVIDIA
  
  Change-Id: I61589b2b0dd2813c4901a157c8d37e470063773c
  Reviewed-on: https://chromium-review.googlesource.com/840842
  Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>
  Reviewed-by: Corentin Wallez <cwallez@chromium.org>
  

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• 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/FunctionsGL.h"
  #include "libANGLE/renderer/gl/RendererGL.h"
  #include "libANGLE/renderer/gl/WorkaroundsGL.h"
  
  #include <iostream>
  
  namespace rx
  {
  
  ShaderGL::ShaderGL(const gl::ShaderState &data,
                     const FunctionsGL *functions,
                     const WorkaroundsGL &workarounds,
                     bool isWebGL,
                     MultiviewImplementationTypeGL multiviewImplementationType)
      : ShaderImpl(data),
        mFunctions(functions),
        mWorkarounds(workarounds),
        mShaderID(0),
        mIsWebGL(isWebGL),
        mMultiviewImplementationType(multiviewImplementationType)
  {
      ASSERT(mFunctions);
  }
  
  ShaderGL::~ShaderGL()
  {
      if (mShaderID != 0)
      {
          mFunctions->deleteShader(mShaderID);
          mShaderID = 0;
      }
  }
  
  ShCompileOptions ShaderGL::prepareSourceAndReturnOptions(std::stringstream *sourceStream,
                                                           std::string * /*sourcePath*/)
  {
      // Reset the previous state
      if (mShaderID != 0)
      {
          mFunctions->deleteShader(mShaderID);
          mShaderID = 0;
      }
  
      *sourceStream << mData.getSource();
  
      ShCompileOptions options = SH_INIT_GL_POSITION;
  
      if (mIsWebGL)
      {
          options |= SH_INIT_OUTPUT_VARIABLES;
      }
  
      if (mWorkarounds.doWhileGLSLCausesGPUHang)
      {
          options |= SH_REWRITE_DO_WHILE_LOOPS;
      }
  
      if (mWorkarounds.emulateAbsIntFunction)
      {
          options |= SH_EMULATE_ABS_INT_FUNCTION;
      }
  
      if (mWorkarounds.addAndTrueToLoopCondition)
      {
          options |= SH_ADD_AND_TRUE_TO_LOOP_CONDITION;
      }
  
      if (mWorkarounds.emulateIsnanFloat)
      {
          options |= SH_EMULATE_ISNAN_FLOAT_FUNCTION;
      }
  
      if (mWorkarounds.emulateAtan2Float)
      {
          options |= SH_EMULATE_ATAN2_FLOAT_FUNCTION;
      }
  
      if (mWorkarounds.useUnusedBlocksWithStandardOrSharedLayout)
      {
          options |= SH_USE_UNUSED_STANDARD_SHARED_BLOCKS;
      }
  
      if (mWorkarounds.dontRemoveInvariantForFragmentInput)
      {
          options |= SH_DONT_REMOVE_INVARIANT_FOR_FRAGMENT_INPUT;
      }
  
      if (mWorkarounds.removeInvariantAndCentroidForESSL3)
      {
          options |= SH_REMOVE_INVARIANT_AND_CENTROID_FOR_ESSL3;
      }
  
      if (mWorkarounds.rewriteFloatUnaryMinusOperator)
      {
          options |= SH_REWRITE_FLOAT_UNARY_MINUS_OPERATOR;
      }
  
      if (!mWorkarounds.dontInitializeUninitializedLocals)
      {
          options |= SH_INITIALIZE_UNINITIALIZED_LOCALS;
      }
  
      if (mWorkarounds.clampPointSize)
      {
          options |= SH_CLAMP_POINT_SIZE;
      }
  
      if (mWorkarounds.rewriteVectorScalarArithmetic)
      {
          options |= SH_REWRITE_VECTOR_SCALAR_ARITHMETIC;
      }
  
      if (mWorkarounds.dontUseLoopsToInitializeVariables)
      {
          options |= SH_DONT_USE_LOOPS_TO_INITIALIZE_VARIABLES;
      }
  
      if (mWorkarounds.clampFragDepth)
      {
          options |= SH_CLAMP_FRAG_DEPTH;
      }
  
      if (mMultiviewImplementationType == MultiviewImplementationTypeGL::NV_VIEWPORT_ARRAY2)
      {
          options |= SH_INITIALIZE_BUILTINS_FOR_INSTANCED_MULTIVIEW;
          options |= SH_SELECT_VIEW_IN_NV_GLSL_VERTEX_SHADER;
      }
  
      return options;
  }
  
  bool ShaderGL::postTranslateCompile(gl::Compiler *compiler, std::string *infoLog)
  {
      // Translate the ESSL into GLSL
      const char *translatedSourceCString = mData.getTranslatedSource().c_str();
  
      // Generate a shader object and set the source
      mShaderID = mFunctions->createShader(mData.getShaderType());
      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);
      if (compileStatus == GL_FALSE)
      {
          // Compilation failed, put the error into the info log
          GLint infoLogLength = 0;
          mFunctions->getShaderiv(mShaderID, GL_INFO_LOG_LENGTH, &infoLogLength);
  
          // Info log length includes the null terminator, so 1 means that the info log is an empty
          // string.
          if (infoLogLength > 1)
          {
              std::vector<char> buf(infoLogLength);
              mFunctions->getShaderInfoLog(mShaderID, infoLogLength, nullptr, &buf[0]);
  
              mFunctions->deleteShader(mShaderID);
              mShaderID = 0;
  
              *infoLog = &buf[0];
              WARN() << std::endl << *infoLog;
          }
          else
          {
              WARN() << std::endl << "Shader compilation failed with no info log.";
          }
          return false;
      }
  
      return true;
  }
  
  std::string ShaderGL::getDebugInfo() const
  {
      return mData.getTranslatedSource();
  }
  
  GLuint ShaderGL::getShaderID() const
  {
      return mShaderID;
  }
  
  }
  

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