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      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 // This file contains the ContextState class.
      6 
      7 #ifndef GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
      8 #define GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
      9 
     10 #include <vector>
     11 #include "base/logging.h"
     12 #include "base/memory/scoped_ptr.h"
     13 #include "gpu/command_buffer/service/gl_utils.h"
     14 #include "gpu/command_buffer/service/query_manager.h"
     15 #include "gpu/command_buffer/service/texture_manager.h"
     16 #include "gpu/command_buffer/service/vertex_attrib_manager.h"
     17 #include "gpu/command_buffer/service/vertex_array_manager.h"
     18 #include "gpu/gpu_export.h"
     19 
     20 namespace gpu {
     21 namespace gles2 {
     22 
     23 class Buffer;
     24 class ErrorState;
     25 class FeatureInfo;
     26 class Framebuffer;
     27 class Program;
     28 class Renderbuffer;
     29 
     30 // State associated with each texture unit.
     31 struct GPU_EXPORT TextureUnit {
     32   TextureUnit();
     33   ~TextureUnit();
     34 
     35   // The last target that was bound to this texture unit.
     36   GLenum bind_target;
     37 
     38   // texture currently bound to this unit's GL_TEXTURE_2D with glBindTexture
     39   scoped_refptr<TextureRef> bound_texture_2d;
     40 
     41   // texture currently bound to this unit's GL_TEXTURE_CUBE_MAP with
     42   // glBindTexture
     43   scoped_refptr<TextureRef> bound_texture_cube_map;
     44 
     45   // texture currently bound to this unit's GL_TEXTURE_EXTERNAL_OES with
     46   // glBindTexture
     47   scoped_refptr<TextureRef> bound_texture_external_oes;
     48 
     49   // texture currently bound to this unit's GL_TEXTURE_RECTANGLE_ARB with
     50   // glBindTexture
     51   scoped_refptr<TextureRef> bound_texture_rectangle_arb;
     52 
     53   scoped_refptr<TextureRef> GetInfoForSamplerType(
     54       GLenum type) {
     55     DCHECK(type == GL_SAMPLER_2D || type == GL_SAMPLER_CUBE ||
     56            type == GL_SAMPLER_EXTERNAL_OES || type == GL_SAMPLER_2D_RECT_ARB);
     57     switch (type) {
     58       case GL_SAMPLER_2D:
     59         return bound_texture_2d;
     60       case GL_SAMPLER_CUBE:
     61         return bound_texture_cube_map;
     62       case GL_SAMPLER_EXTERNAL_OES:
     63         return bound_texture_external_oes;
     64       case GL_SAMPLER_2D_RECT_ARB:
     65         return bound_texture_rectangle_arb;
     66     }
     67 
     68     NOTREACHED();
     69     return NULL;
     70   }
     71 
     72   void Unbind(TextureRef* texture) {
     73     if (bound_texture_2d.get() == texture) {
     74       bound_texture_2d = NULL;
     75     }
     76     if (bound_texture_cube_map.get() == texture) {
     77       bound_texture_cube_map = NULL;
     78     }
     79     if (bound_texture_external_oes.get() == texture) {
     80       bound_texture_external_oes = NULL;
     81     }
     82   }
     83 };
     84 
     85 struct Vec4 {
     86   Vec4() {
     87     v[0] = 0.0f;
     88     v[1] = 0.0f;
     89     v[2] = 0.0f;
     90     v[3] = 1.0f;
     91   }
     92   float v[4];
     93 };
     94 
     95 struct GPU_EXPORT ContextState {
     96   ContextState(FeatureInfo* feature_info, Logger* logger);
     97   ~ContextState();
     98 
     99   void Initialize();
    100 
    101   void RestoreState() const;
    102   void InitCapabilities() const;
    103   void InitState() const;
    104 
    105   void RestoreActiveTexture() const;
    106   void RestoreAllTextureUnitBindings() const;
    107   void RestoreAttribute(GLuint index) const;
    108   void RestoreBufferBindings() const;
    109   void RestoreGlobalState() const;
    110   void RestoreProgramBindings() const;
    111   void RestoreRenderbufferBindings() const;
    112   void RestoreTextureUnitBindings(GLuint unit) const;
    113 
    114   // Helper for getting cached state.
    115   bool GetStateAsGLint(
    116       GLenum pname, GLint* params, GLsizei* num_written) const;
    117   bool GetStateAsGLfloat(
    118       GLenum pname, GLfloat* params, GLsizei* num_written) const;
    119   bool GetEnabled(GLenum cap) const;
    120 
    121   ErrorState* GetErrorState();
    122 
    123   #include "gpu/command_buffer/service/context_state_autogen.h"
    124 
    125   EnableFlags enable_flags;
    126 
    127   // Current active texture by 0 - n index.
    128   // In other words, if we call glActiveTexture(GL_TEXTURE2) this value would
    129   // be 2.
    130   GLuint active_texture_unit;
    131 
    132   // The currently bound array buffer. If this is 0 it is illegal to call
    133   // glVertexAttribPointer.
    134   scoped_refptr<Buffer> bound_array_buffer;
    135 
    136   // Which textures are bound to texture units through glActiveTexture.
    137   std::vector<TextureUnit> texture_units;
    138 
    139   // The values for each attrib.
    140   std::vector<Vec4> attrib_values;
    141 
    142   // Class that manages vertex attribs.
    143   scoped_refptr<VertexAttribManager> vertex_attrib_manager;
    144 
    145   // The program in use by glUseProgram
    146   scoped_refptr<Program> current_program;
    147 
    148   // The currently bound framebuffers
    149   scoped_refptr<Framebuffer> bound_read_framebuffer;
    150   scoped_refptr<Framebuffer> bound_draw_framebuffer;
    151 
    152   // The currently bound renderbuffer
    153   scoped_refptr<Renderbuffer> bound_renderbuffer;
    154 
    155   scoped_refptr<QueryManager::Query> current_query;
    156 
    157   bool pack_reverse_row_order;
    158 
    159   mutable bool fbo_binding_for_scissor_workaround_dirty_;
    160   FeatureInfo* feature_info_;
    161 
    162  private:
    163   scoped_ptr<ErrorState> error_state_;
    164 };
    165 
    166 }  // namespace gles2
    167 }  // namespace gpu
    168 
    169 #endif  // GPU_COMMAND_BUFFER_SERVICE_CONTEXT_STATE_H_
    170 
    171