1 files changed, 295 insertions, 0 deletions
diff --git a/dom/canvas/WebGLFramebuffer.h b/dom/canvas/WebGLFramebuffer.h
new file mode 100644
index 000000000..ac457c098
--- /dev/null
+++ b/dom/canvas/WebGLFramebuffer.h
@@ -0,0 +1,295 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef WEBGL_FRAMEBUFFER_H_
+#define WEBGL_FRAMEBUFFER_H_
+
+#include <vector>
+
+#include "mozilla/LinkedList.h"
+#include "mozilla/WeakPtr.h"
+#include "nsWrapperCache.h"
+
+#include "WebGLObjectModel.h"
+#include "WebGLRenderbuffer.h"
+#include "WebGLStrongTypes.h"
+#include "WebGLTexture.h"
+#include "WebGLTypes.h"
+
+namespace mozilla {
+
+class WebGLFramebuffer;
+class WebGLRenderbuffer;
+class WebGLTexture;
+
+template<typename T>
+class PlacementArray;
+
+namespace gl {
+    class GLContext;
+} // namespace gl
+
+class WebGLFBAttachPoint final
+{
+    friend class WebGLFramebuffer;
+public:
+    WebGLFramebuffer* const mFB;
+    const GLenum mAttachmentPoint;
+
+protected:
+    WebGLRefPtr<WebGLTexture> mTexturePtr;
+    WebGLRefPtr<WebGLRenderbuffer> mRenderbufferPtr;
+    TexImageTarget mTexImageTarget;
+    GLint mTexImageLayer;
+    uint32_t mTexImageLevel;
+
+    ////
+
+    WebGLFBAttachPoint();
+    WebGLFBAttachPoint(WebGLFramebuffer* fb, GLenum attachmentPoint);
+
+public:
+    ~WebGLFBAttachPoint();
+
+    ////
+
+    void Unlink();
+
+    bool IsDefined() const;
+    bool IsDeleteRequested() const;
+
+    const webgl::FormatUsageInfo* Format() const;
+    uint32_t Samples() const;
+
+    bool HasAlpha() const;
+    bool IsReadableFloat() const;
+
+    void Clear();
+
+    void SetTexImage(WebGLTexture* tex, TexImageTarget target, GLint level,
+                     GLint layer = 0);
+    void SetRenderbuffer(WebGLRenderbuffer* rb);
+
+    WebGLTexture* Texture() const { return mTexturePtr; }
+    WebGLRenderbuffer* Renderbuffer() const { return mRenderbufferPtr; }
+
+    TexImageTarget ImageTarget() const {
+        return mTexImageTarget;
+    }
+    GLint Layer() const {
+        return mTexImageLayer;
+    }
+    uint32_t MipLevel() const {
+        return mTexImageLevel;
+    }
+    void AttachmentName(nsCString* out) const;
+
+    bool HasUninitializedImageData() const;
+    void SetImageDataStatus(WebGLImageDataStatus x) const;
+
+    void Size(uint32_t* const out_width, uint32_t* const out_height) const;
+
+    bool HasImage() const;
+    bool IsComplete(WebGLContext* webgl, nsCString* const out_info) const;
+
+    void Resolve(gl::GLContext* gl) const;
+
+    JS::Value GetParameter(const char* funcName, WebGLContext* webgl, JSContext* cx,
+                           GLenum target, GLenum attachment, GLenum pname,
+                           ErrorResult* const out_error) const;
+
+    void OnBackingStoreRespecified() const;
+
+    bool IsEquivalentForFeedback(const WebGLFBAttachPoint& other) const {
+        if (!IsDefined() || !other.IsDefined())
+            return false;
+
+#define _(X) X == other.X
+        return ( _(mRenderbufferPtr) &&
+                 _(mTexturePtr) &&
+                 _(mTexImageTarget.get()) &&
+                 _(mTexImageLevel) &&
+                 _(mTexImageLayer) );
+#undef _
+    }
+
+    ////
+
+    struct Ordered {
+        const WebGLFBAttachPoint& mRef;
+
+        explicit Ordered(const WebGLFBAttachPoint& ref)
+            : mRef(ref)
+        { }
+
+        bool operator<(const Ordered& other) const {
+            MOZ_ASSERT(mRef.IsDefined() && other.mRef.IsDefined());
+
+#define ORDER_BY(X) if (X != other.X) return X < other.X;
+
+            ORDER_BY(mRef.mRenderbufferPtr)
+            ORDER_BY(mRef.mTexturePtr)
+            ORDER_BY(mRef.mTexImageTarget.get())
+            ORDER_BY(mRef.mTexImageLevel)
+            ORDER_BY(mRef.mTexImageLayer)
+
+#undef ORDER_BY
+            return false;
+        }
+    };
+};
+
+class WebGLFramebuffer final
+    : public nsWrapperCache
+    , public WebGLRefCountedObject<WebGLFramebuffer>
+    , public LinkedListElement<WebGLFramebuffer>
+    , public SupportsWeakPtr<WebGLFramebuffer>
+{
+    friend class WebGLContext;
+
+public:
+    MOZ_DECLARE_WEAKREFERENCE_TYPENAME(WebGLFramebuffer)
+
+    const GLuint mGLName;
+
+protected:
+#ifdef ANDROID
+    // Bug 1140459: Some drivers (including our test slaves!) don't
+    // give reasonable answers for IsRenderbuffer, maybe others.
+    // This shows up on Android 2.3 emulator.
+    //
+    // So we track the `is a Framebuffer` state ourselves.
+    bool mIsFB;
+#endif
+
+    ////
+
+    WebGLFBAttachPoint mDepthAttachment;
+    WebGLFBAttachPoint mStencilAttachment;
+    WebGLFBAttachPoint mDepthStencilAttachment;
+
+    // In theory, this number can be unbounded based on the driver. However, no driver
+    // appears to expose more than 8. We might as well stop there too, for now.
+    // (http://opengl.gpuinfo.org/gl_stats_caps_single.php?listreportsbycap=GL_MAX_COLOR_ATTACHMENTS)
+    static const size_t kMaxColorAttachments = 8; // jgilbert's MacBook Pro exposes 8.
+    WebGLFBAttachPoint mColorAttachments[kMaxColorAttachments];
+
+    ////
+
+    std::vector<const WebGLFBAttachPoint*> mColorDrawBuffers; // Non-null
+    const WebGLFBAttachPoint* mColorReadBuffer; // Null if NONE
+
+    ////
+
+    struct ResolvedData {
+        // IsFeedback
+        std::vector<const WebGLFBAttachPoint*> texDrawBuffers; // Non-null
+        std::set<WebGLFBAttachPoint::Ordered> drawSet;
+        std::set<WebGLFBAttachPoint::Ordered> readSet;
+
+        explicit ResolvedData(const WebGLFramebuffer& parent);
+    };
+
+    UniquePtr<const ResolvedData> mResolvedCompleteData;
+
+    ////
+
+public:
+    NS_INLINE_DECL_CYCLE_COLLECTING_NATIVE_REFCOUNTING(WebGLFramebuffer)
+    NS_DECL_CYCLE_COLLECTION_SCRIPT_HOLDER_NATIVE_CLASS(WebGLFramebuffer)
+
+    WebGLFramebuffer(WebGLContext* webgl, GLuint fbo);
+
+    WebGLContext* GetParentObject() const { return mContext; }
+    virtual JSObject* WrapObject(JSContext* cx, JS::Handle<JSObject*> givenProto) override;
+
+private:
+    ~WebGLFramebuffer() {
+        DeleteOnce();
+    }
+
+public:
+    void Delete();
+
+    ////
+
+    bool HasDefinedAttachments() const;
+    bool HasIncompleteAttachments(nsCString* const out_info) const;
+    bool AllImageRectsMatch() const;
+    bool AllImageSamplesMatch() const;
+    FBStatus PrecheckFramebufferStatus(nsCString* const out_info) const;
+
+protected:
+    Maybe<WebGLFBAttachPoint*> GetAttachPoint(GLenum attachment); // Fallible
+    Maybe<WebGLFBAttachPoint*> GetColorAttachPoint(GLenum attachment); // Fallible
+    void ResolveAttachments() const;
+    void RefreshDrawBuffers() const;
+    void RefreshReadBuffer() const;
+    bool ResolveAttachmentData(const char* funcName) const;
+
+public:
+    void DetachTexture(const WebGLTexture* tex);
+    void DetachRenderbuffer(const WebGLRenderbuffer* rb);
+    bool ValidateAndInitAttachments(const char* funcName);
+    bool ValidateClearBufferType(const char* funcName, GLenum buffer, uint32_t drawBuffer,
+                                 GLenum funcType) const;
+
+    bool ValidateForRead(const char* info,
+                         const webgl::FormatUsageInfo** const out_format,
+                         uint32_t* const out_width, uint32_t* const out_height);
+
+    ////////////////
+    // Getters
+
+#define GETTER(X) const decltype(m##X)& X() const { return m##X; }
+
+    GETTER(DepthAttachment)
+    GETTER(StencilAttachment)
+    GETTER(DepthStencilAttachment)
+    GETTER(ColorDrawBuffers)
+    GETTER(ColorReadBuffer)
+    GETTER(ResolvedCompleteData)
+
+#undef GETTER
+
+    ////////////////
+    // Invalidation
+
+    bool IsResolvedComplete() const { return bool(mResolvedCompleteData); }
+
+    void InvalidateFramebufferStatus() {
+        mResolvedCompleteData = nullptr;
+    }
+
+    void RefreshResolvedData();
+
+    ////////////////
+    // WebGL funcs
+
+    FBStatus CheckFramebufferStatus(const char* funcName);
+    void FramebufferRenderbuffer(const char* funcName, GLenum attachment, GLenum rbtarget,
+                                 WebGLRenderbuffer* rb);
+    void FramebufferTexture2D(const char* funcName, GLenum attachment,
+                              GLenum texImageTarget, WebGLTexture* tex, GLint level);
+    void FramebufferTextureLayer(const char* funcName, GLenum attachment,
+                                 WebGLTexture* tex, GLint level, GLint layer);
+    void DrawBuffers(const char* funcName, const dom::Sequence<GLenum>& buffers);
+    void ReadBuffer(const char* funcName, GLenum attachPoint);
+
+    JS::Value GetAttachmentParameter(const char* funcName, JSContext* cx, GLenum target,
+                                     GLenum attachment, GLenum pname,
+                                     ErrorResult* const out_error);
+
+    static void BlitFramebuffer(WebGLContext* webgl,
+                                const WebGLFramebuffer* src, GLint srcX0, GLint srcY0,
+                                GLint srcX1, GLint srcY1,
+                                const WebGLFramebuffer* dst, GLint dstX0, GLint dstY0,
+                                GLint dstX1, GLint dstY1,
+                                GLbitfield mask, GLenum filter);
+};
+
+} // namespace mozilla
+
+#endif // WEBGL_FRAMEBUFFER_H_