Reland "webgl: use immutable texture for the default FBO."

third_party/WebKit/Source/modules/webgl/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 113 matching lines @@
 private:
     gpu::gles2::GLES2Interface* m_contextGL;
     GLboolean m_colorMask[4];
     const bool m_requiresEmulation;
 };
 
 class MODULES_EXPORT WebGLRenderingContextBase : public CanvasRenderingContext {
 public:
     ~WebGLRenderingContextBase() override;
 
-    virtual unsigned version() const = 0;
     virtual String contextName() const = 0;
     virtual void registerContextExtensions() = 0;
 
     virtual void initializeNewContext();
 
     static unsigned getWebGLVersion(const CanvasRenderingContext*);
 
     static std::unique_ptr<WebGraphicsContext3DProvider> createWebGraphicsContext3DProvider(HTMLCanvasElement*, WebGLContextAttributes, unsigned webGLVersion);
     static std::unique_ptr<WebGraphicsContext3DProvider> createWebGraphicsContext3DProvider(ScriptState*, WebGLContextAttributes, unsigned webGLVersion);
     static void forceNextWebGLContextCreationToFail();
 
+    unsigned version() const { return m_version; }
+
     int drawingBufferWidth() const;
     int drawingBufferHeight() const;
 
     void activeTexture(GLenum texture);
     void attachShader(ScriptState*, WebGLProgram*, WebGLShader*);
     void bindAttribLocation(WebGLProgram*, GLuint index, const String& name);
     void bindBuffer(ScriptState*, GLenum target, WebGLBuffer*);
     virtual void bindFramebuffer(ScriptState*, GLenum target, WebGLFramebuffer*);
     void bindRenderbuffer(ScriptState*, GLenum target, WebGLRenderbuffer*);
     void bindTexture(ScriptState*, GLenum target, WebGLTexture*);
@@ skipping 267 matching lines @@
     friend class WebGLCompressedTextureASTC;
     friend class WebGLCompressedTextureATC;
     friend class WebGLCompressedTextureETC1;
     friend class WebGLCompressedTexturePVRTC;
     friend class WebGLCompressedTextureS3TC;
     friend class WebGLRenderingContextErrorMessageCallback;
     friend class WebGLVertexArrayObjectBase;
     friend class ScopedTexture2DRestorer;
     friend class ScopedFramebufferRestorer;
 
-    WebGLRenderingContextBase(HTMLCanvasElement*, std::unique_ptr<WebGraphicsContext3DProvider>, const WebGLContextAttributes&);
-    WebGLRenderingContextBase(OffscreenCanvas*, std::unique_ptr<WebGraphicsContext3DProvider>, const WebGLContextAttributes&);
+    WebGLRenderingContextBase(HTMLCanvasElement*, std::unique_ptr<WebGraphicsContext3DProvider>, const WebGLContextAttributes&, unsigned);
+    WebGLRenderingContextBase(OffscreenCanvas*, std::unique_ptr<WebGraphicsContext3DProvider>, const WebGLContextAttributes&, unsigned);
     PassRefPtr<DrawingBuffer> createDrawingBuffer(std::unique_ptr<WebGraphicsContext3DProvider>);
     void setupFlags();
 
     // CanvasRenderingContext implementation.
     bool is3d() const override { return true; }
     bool isAccelerated() const override { return true; }
     void setIsHidden(bool) override;
     bool paintRenderingResultsToCanvas(SourceDrawingBuffer) override;
     WebLayer* platformLayer() const override;
     void stop() override;
@@ skipping 655 matching lines @@
     // Helper functions for tex(Sub)Image2D && texSubImage3D
     void texImageHelperDOMArrayBufferView(TexImageFunctionID, GLenum, GLint, GLint, GLsizei, GLsizei, GLint, GLenum, GLenum, GLsizei, GLint, GLint, GLint, DOMArrayBufferView*);
     void texImageHelperImageData(TexImageFunctionID, GLenum, GLint, GLint, GLint, GLenum, GLenum, GLsizei, GLint, GLint, GLint, ImageData*);
     void texImageHelperHTMLImageElement(TexImageFunctionID, GLenum, GLint, GLint, GLenum, GLenum, GLint, GLint, GLint, HTMLImageElement*, ExceptionState&);
     void texImageHelperHTMLCanvasElement(TexImageFunctionID, GLenum, GLint, GLint, GLenum, GLenum, GLint, GLint, GLint, HTMLCanvasElement*, ExceptionState&);
     void texImageHelperHTMLVideoElement(TexImageFunctionID, GLenum, GLint, GLint, GLenum, GLenum, GLint, GLint, GLint, HTMLVideoElement*, ExceptionState&);
     void texImageHelperImageBitmap(TexImageFunctionID, GLenum, GLint, GLint, GLenum, GLenum, GLint, GLint, GLint, ImageBitmap*, ExceptionState&);
     static const char* getTexImageFunctionName(TexImageFunctionID);
 
 private:
-    WebGLRenderingContextBase(HTMLCanvasElement*, OffscreenCanvas*, std::unique_ptr<WebGraphicsContext3DProvider>, const WebGLContextAttributes&);
+    WebGLRenderingContextBase(HTMLCanvasElement*, OffscreenCanvas*, std::unique_ptr<WebGraphicsContext3DProvider>, const WebGLContextAttributes&, unsigned);
     static std::unique_ptr<WebGraphicsContext3DProvider> createContextProviderInternal(HTMLCanvasElement*, ScriptState*, WebGLContextAttributes, unsigned);
     void texImageCanvasByGPU(HTMLCanvasElement*, GLuint, GLenum, GLenum, GLint);
     void texImageBitmapByGPU(ImageBitmap*, GLuint, GLenum, GLenum, GLint, bool);
+
+    const unsigned m_version;
 };
 
 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