gpu/command_buffer/service/shader_translator_cache.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef GPU_COMMAND_BUFFER_SERVICE_SHADER_TRANSLATOR_CACHE_H_
   6 #define GPU_COMMAND_BUFFER_SERVICE_SHADER_TRANSLATOR_CACHE_H_
   7
   8 #include <string.h>
   9
  10 #include <map>
  11
  12 #include "base/memory/ref_counted.h"
  13 #include "gpu/command_buffer/service/shader_translator.h"
  14 #include "third_party/angle/include/GLSLANG/ShaderLang.h"
  15
  16 namespace gpu {
  17 namespace gles2 {
  18
  19 // This class is not thread safe and can only be created and destroyed
  20 // on a single thread. But it is safe to use two independent instances on two
  21 // threads without synchronization.
  22 //
  23 // TODO(backer): Investigate using glReleaseShaderCompiler as an alternative to
  24 // to this cache.
  25 class GPU_EXPORT ShaderTranslatorCache
  26     : public base::RefCounted<ShaderTranslatorCache>,
  27       public NON_EXPORTED_BASE(ShaderTranslator::DestructionObserver) {
  28  public:
  29   ShaderTranslatorCache();
  30
  31   // ShaderTranslator::DestructionObserver implementation
  32   virtual void OnDestruct(ShaderTranslator* translator) OVERRIDE;
  33
  34   scoped_refptr<ShaderTranslator> GetTranslator(
  35       sh::GLenum shader_type,
  36       ShShaderSpec shader_spec,
  37       const ShBuiltInResources* resources,
  38       ShaderTranslatorInterface::GlslImplementationType
  39           glsl_implementation_type,
  40       ShCompileOptions driver_bug_workarounds);
  41
  42  private:
  43   friend class base::RefCounted<ShaderTranslatorCache>;
  44   virtual ~ShaderTranslatorCache();
  45
  46   // Parameters passed into ShaderTranslator::Init
  47   struct ShaderTranslatorInitParams {
  48     sh::GLenum shader_type;
  49     ShShaderSpec shader_spec;
  50     ShBuiltInResources resources;
  51     ShaderTranslatorInterface::GlslImplementationType
  52         glsl_implementation_type;
  53     ShCompileOptions driver_bug_workarounds;
  54
  55     ShaderTranslatorInitParams(
  56         sh::GLenum shader_type,
  57         ShShaderSpec shader_spec,
  58         const ShBuiltInResources& resources,
  59         ShaderTranslatorInterface::GlslImplementationType
  60             glsl_implementation_type,
  61         ShCompileOptions driver_bug_workarounds)
  62       : shader_type(shader_type),
  63         shader_spec(shader_spec),
  64         resources(resources),
  65         glsl_implementation_type(glsl_implementation_type),
  66         driver_bug_workarounds(driver_bug_workarounds) {
  67     }
  68
  69     ShaderTranslatorInitParams(const ShaderTranslatorInitParams& params) {
  70       memcpy(this, &params, sizeof(*this));
  71     }
  72
  73     bool operator== (const ShaderTranslatorInitParams& params) const {
  74       return memcmp(&params, this, sizeof(*this)) == 0;
  75     }
  76
  77     bool operator< (const ShaderTranslatorInitParams& params) const {
  78       return memcmp(&params, this, sizeof(*this)) < 0;
  79     }
  80   };
  81
  82   typedef std::map<ShaderTranslatorInitParams, ShaderTranslator* > Cache;
  83   Cache cache_;
  84
  85   DISALLOW_COPY_AND_ASSIGN(ShaderTranslatorCache);
  86 };
  87
  88 }  // namespace gles2
  89 }  // namespace gpu
  90
  91 #endif  // GPU_COMMAND_BUFFER_SERVICE_SHADER_TRANSLATOR_CACHE_H_