WebGL 2: add read/write framebuffer binding points to related APIs

Source/core/html/canvas/WebGLRenderingContextBase.h

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 148 matching lines @@
     PassRefPtrWillBeRawPtr<WebGLBuffer> createBuffer();
     PassRefPtrWillBeRawPtr<WebGLFramebuffer> createFramebuffer();
     PassRefPtrWillBeRawPtr<WebGLProgram> createProgram();
     PassRefPtrWillBeRawPtr<WebGLRenderbuffer> createRenderbuffer();
     PassRefPtrWillBeRawPtr<WebGLShader> createShader(GLenum type);
     PassRefPtrWillBeRawPtr<WebGLTexture> createTexture();
 
     void cullFace(GLenum mode);
 
     void deleteBuffer(WebGLBuffer*);
-    void deleteFramebuffer(WebGLFramebuffer*);
+    virtual void deleteFramebuffer(WebGLFramebuffer*);
     void deleteProgram(WebGLProgram*);
     void deleteRenderbuffer(WebGLRenderbuffer*);
     void deleteShader(WebGLShader*);
     void deleteTexture(WebGLTexture*);
 
     void depthFunc(GLenum);
     void depthMask(GLboolean);
     void depthRange(GLfloat zNear, GLfloat zFar);
     void detachShader(WebGLProgram*, WebGLShader*);
     void disable(GLenum cap);
@@ skipping 593 matching lines @@
 
     void handleTextureCompleteness(const char*, bool);
     void createFallbackBlackTextures1x1();
 
     // Helper function for copyTex{Sub}Image, check whether the internalformat
     // and the color buffer format of the current bound framebuffer combination
     // is valid.
     bool isTexInternalFormatColorBufferCombinationValid(GLenum texInternalFormat, GLenum colorBufferFormat);
 
     // Helper function to get the bound framebuffer's color buffer format.
-    GLenum boundFramebufferColorFormat();
+    virtual GLenum boundFramebufferColorFormat();
 
     // Helper function to verify limits on the length of uniform and attribute locations.
     bool validateLocationLength(const char* functionName, const String&);
 
     // Helper function to check if size is non-negative.
     // Generate GL error and return false for negative inputs; otherwise, return true.
     bool validateSize(const char* functionName, GLint x, GLint y);
 
     // Helper function to check if all characters in the string belong to the
     // ASCII subset as defined in GLSL ES 1.0 spec section 3.1.
@@ skipping 94 matching lines @@
     // Helper function to validate the target for checkFramebufferStatus and validateFramebufferFuncParameters.
     virtual bool validateFramebufferTarget(GLenum target);
 
     // Get the framebuffer bound to given target
     virtual WebGLFramebuffer* getFramebufferBinding(GLenum target);
 
     // Helper function to validate input parameters for framebuffer functions.
     // Generate GL error if parameters are illegal.
     bool validateFramebufferFuncParameters(const char* functionName, GLenum target, GLenum attachment);
 
+    // Helper function to get draw Framebuffer target. Return GL_FRAMEBUFFER for
+    // WebGLRenderingContext. Return GL_DRAW_FRAMEBUFFER for WebGL2RenderingContext.
+    virtual GLenum getDrawFramebufferTarget();
+
     // Helper function to validate blend equation mode.
     bool validateBlendEquation(const char* functionName, GLenum);
 
     // Helper function to validate blend func factors.
     bool validateBlendFuncFactors(const char* functionName, GLenum src, GLenum dst);
 
     // Helper function to validate a GL capability.
     virtual bool validateCapability(const char* functionName, GLenum);
 
     // Helper function to validate input parameters for uniform functions.
@@ skipping 75 matching lines @@
     IntSize clampedCanvasSize();
 
     // First time called, if EXT_draw_buffers is supported, query the value; otherwise return 0.
     // Later, return the cached value.
     GLint maxDrawBuffers();
     GLint maxColorAttachments();
 
     void setBackDrawBuffer(GLenum);
     void setFramebuffer(GLenum, WebGLFramebuffer*);
 
-    void restoreCurrentFramebuffer();
+    virtual void restoreCurrentFramebuffer();
     void restoreCurrentTexture2D();
 
     virtual void multisamplingChanged(bool) override;
 
     void findNewMaxNonDefaultTextureUnit();
 
     friend class WebGLStateRestorer;
     friend class WebGLRenderingContextEvictionManager;
 
     static Vector<WebGLRenderingContextBase*>& activeContexts();
@@ skipping 11 matching lines @@
     static IntSize oldestContextSize();
 };
 
 DEFINE_TYPE_CASTS(WebGLRenderingContextBase, CanvasRenderingContext, context, context->is3d(), context.is3d());
 
 } // namespace blink
 
 WTF_ALLOW_MOVE_INIT_AND_COMPARE_WITH_MEM_FUNCTIONS(blink::WebGLRenderingContextBase::TextureUnitState);
 
 #endif // WebGLRenderingContextBase_h