Implement support for rendering to 32-bit float textures on ES3

gpu/command_buffer/service/texture_manager.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_
 #define GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_
 
 #include <list>
 #include <set>
 #include <string>
@@ skipping 98 matching lines @@
 
   // Get the image bound to a particular level. Returns NULL if level
   // does not exist.
   gfx::GLImage* GetLevelImage(GLint target, GLint level) const;
 
   bool HasImages() const {
     return has_images_;
   }
 
   // Returns true of the given dimensions are inside the dimensions of the
-  // level and if the format and type match the level.
+  // level and if the type matches the level.
   bool ValidForTexture(
       GLint target,
       GLint level,
       GLint xoffset,
       GLint yoffset,
       GLsizei width,
       GLsizei height,
-      GLenum format,
       GLenum type) const;
 
   bool IsValid() const {
     return !!target();
   }
 
   bool IsAttachedToFramebuffer() const {
     return framebuffer_attachment_count_ != 0;
   }
 
@@ skipping 562 matching lines @@
     ContextState* state,
     DecoderFramebufferState* framebuffer_state,
     const DoTextImage2DArguments& args);
 
   // TODO(kloveless): Make GetTexture* private once this is no longer called
   // from gles2_cmd_decoder.
   TextureRef* GetTextureInfoForTarget(ContextState* state, GLenum target);
   TextureRef* GetTextureInfoForTargetUnlessDefault(
       ContextState* state, GLenum target);
 
+  bool ValidateFormatAndTypeCombination(
+    ErrorState* error_state, const char* function_name,
+    GLenum format, GLenum type);
+
+  // Note that internal_format is only checked in relation to the format
+  // parameter, so that this function may be used to validate texSubImage2D.
   bool ValidateTextureParameters(
     ErrorState* error_state, const char* function_name,
-    GLenum target, GLenum format, GLenum type, GLint level);
+    GLenum format, GLenum type, GLenum internal_format, GLint level);
 
  private:
   friend class Texture;
   friend class TextureRef;
 
   // Helper for Initialize().
   scoped_refptr<TextureRef> CreateDefaultAndBlackTextures(
       GLenum target,
       GLuint* black_texture);
 
@@ skipping 64 matching lines @@
  private:
   DecoderTextureState* texture_state_;
   base::TimeTicks begin_time_;
   DISALLOW_COPY_AND_ASSIGN(ScopedTextureUploadTimer);
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_TEXTURE_MANAGER_H_