kc3-lang/angle/src/compiler/translator/TextureFunctionHLSL.h

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• Author : Geoff Lang
  Date : 2016-08-25 13:23:01
  Hash : 1fe74c7e
  Message : Manually compute the mipmap size for the textureSize builtin. There were two issues with the current implementation: * The GetDimensions function already takes into account the base level of the SRV. * The GetDimensions function returns doesn't return valid sizes for levels that don't exist in the SRV. Instead, manually do the lod offset. BUG=angleproject:931 BUG=angleproject:1316 TEST=dEQP-GLES3.functional.shaders.texture_functions.texturesize.sampler2d_fixed_vertex Change-Id: I63259b563a42b93b73949e0ef7ac412099a42f13 Reviewed-on: https://chromium-review.googlesource.com/376099 Reviewed-by: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Zhenyao Mo <zmo@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>

• src/compiler/translator/TextureFunctionHLSL.h

• //
  // Copyright (c) 2016 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.
  //
  // TextureFunctionHLSL: Class for writing implementations of ESSL texture functions into HLSL
  // output. Some of the implementations are straightforward and just call the HLSL equivalent of the
  // ESSL texture function, others do more work to emulate ESSL texture sampling or size query
  // behavior.
  //
  
  #ifndef COMPILER_TRANSLATOR_TEXTUREFUNCTIONHLSL_H_
  #define COMPILER_TRANSLATOR_TEXTUREFUNCTIONHLSL_H_
  
  #include <set>
  
  #include "compiler/translator/BaseTypes.h"
  #include "compiler/translator/Common.h"
  #include "compiler/translator/InfoSink.h"
  #include "GLSLANG/ShaderLang.h"
  
  namespace sh
  {
  
  class TextureFunctionHLSL final : angle::NonCopyable
  {
    public:
      struct TextureFunction
      {
          // See ESSL 3.00.6 section 8.8 for reference about what the different methods below do.
          enum Method
          {
              IMPLICIT,  // Mipmap LOD determined implicitly (standard lookup)
              BIAS,
              LOD,
              LOD0,
              LOD0BIAS,
              SIZE,  // textureSize()
              FETCH,
              GRAD
          };
  
          TString name() const;
  
          bool operator<(const TextureFunction &rhs) const;
  
          const char *getReturnType() const;
  
          TBasicType sampler;
          int coords;
          bool proj;
          bool offset;
          Method method;
      };
  
      // Returns the name of the texture function implementation to call.
      // The name that's passed in is the name of the GLSL texture function that it should implement.
      TString useTextureFunction(const TString &name,
                                 TBasicType samplerType,
                                 int coords,
                                 size_t argumentCount,
                                 bool lod0,
                                 sh::GLenum shaderType);
  
      void textureFunctionHeader(TInfoSinkBase &out,
                                 const ShShaderOutput outputType,
                                 bool getDimensionsIgnoresBaseLevel);
  
    private:
      typedef std::set<TextureFunction> TextureFunctionSet;
      TextureFunctionSet mUsesTexture;
  };
  
  }  // namespace sh
  
  #endif  // COMPILER_TRANSLATOR_TEXTUREFUNCTIONHLSL_H_