Line data    Source code

       1             : //
       2             : // Copyright (c) 2016 The ANGLE Project Authors. All rights reserved.
       3             : // Use of this source code is governed by a BSD-style license that can be
       4             : // found in the LICENSE file.
       5             : //
       6             : // TextureFunctionHLSL: Class for writing implementations of ESSL texture functions into HLSL
       7             : // output. Some of the implementations are straightforward and just call the HLSL equivalent of the
       8             : // ESSL texture function, others do more work to emulate ESSL texture sampling or size query
       9             : // behavior.
      10             : //
      11             : 
      12             : #ifndef COMPILER_TRANSLATOR_TEXTUREFUNCTIONHLSL_H_
      13             : #define COMPILER_TRANSLATOR_TEXTUREFUNCTIONHLSL_H_
      14             : 
      15             : #include <set>
      16             : 
      17             : #include "compiler/translator/BaseTypes.h"
      18             : #include "compiler/translator/Common.h"
      19             : #include "compiler/translator/InfoSink.h"
      20             : #include "GLSLANG/ShaderLang.h"
      21             : 
      22             : namespace sh
      23             : {
      24             : 
      25           0 : class TextureFunctionHLSL final : angle::NonCopyable
      26             : {
      27             :   public:
      28             :     struct TextureFunction
      29             :     {
      30             :         // See ESSL 3.00.6 section 8.8 for reference about what the different methods below do.
      31             :         enum Method
      32             :         {
      33             :             IMPLICIT,  // Mipmap LOD determined implicitly (standard lookup)
      34             :             BIAS,
      35             :             LOD,
      36             :             LOD0,
      37             :             LOD0BIAS,
      38             :             SIZE,  // textureSize()
      39             :             FETCH,
      40             :             GRAD
      41             :         };
      42             : 
      43             :         TString name() const;
      44             : 
      45             :         bool operator<(const TextureFunction &rhs) const;
      46             : 
      47             :         const char *getReturnType() const;
      48             : 
      49             :         TBasicType sampler;
      50             :         int coords;
      51             :         bool proj;
      52             :         bool offset;
      53             :         Method method;
      54             :     };
      55             : 
      56             :     // Returns the name of the texture function implementation to call.
      57             :     // The name that's passed in is the name of the GLSL texture function that it should implement.
      58             :     TString useTextureFunction(const TString &name,
      59             :                                TBasicType samplerType,
      60             :                                int coords,
      61             :                                size_t argumentCount,
      62             :                                bool lod0,
      63             :                                sh::GLenum shaderType);
      64             : 
      65             :     void textureFunctionHeader(TInfoSinkBase &out,
      66             :                                const ShShaderOutput outputType,
      67             :                                bool getDimensionsIgnoresBaseLevel);
      68             : 
      69             :   private:
      70             :     typedef std::set<TextureFunction> TextureFunctionSet;
      71             :     TextureFunctionSet mUsesTexture;
      72             : };
      73             : 
      74             : }  // namespace sh
      75             : 
      76             : #endif  // COMPILER_TRANSLATOR_TEXTUREFUNCTIONHLSL_H_