1 files changed, 109 insertions, 0 deletions
diff --git a/gfx/gl/MozFramebuffer.h b/gfx/gl/MozFramebuffer.h
new file mode 100644
index 0000000000..dd51ef6154
--- /dev/null
+++ b/gfx/gl/MozFramebuffer.h
@@ -0,0 +1,109 @@
+/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 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 MOZ_FRAMEBUFFER_H_
+#define MOZ_FRAMEBUFFER_H_
+
+#include "gfx2DGlue.h"
+#include "GLConsts.h"
+#include "GLContextTypes.h"
+#include "mozilla/UniquePtr.h"
+#include "mozilla/WeakPtr.h"
+
+namespace mozilla {
+namespace gl {
+
+class DepthAndStencilBuffer final : public SupportsWeakPtr {
+  const WeakPtr<GLContext> mWeakGL;
+  const gfx::IntSize mSize;
+
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DepthAndStencilBuffer)
+
+  const GLuint mDepthRB;
+  const GLuint mStencilRB;
+
+  static RefPtr<DepthAndStencilBuffer> Create(GLContext* const gl,
+                                              const gfx::IntSize& size,
+                                              const uint32_t samples);
+
+  RefPtr<GLContext> gl() const { return mWeakGL.get(); }
+
+  // 4 bytes per pixel (24-bit depth + 8-bit stencil).
+  uint64_t EstimateMemory() const {
+    return static_cast<uint64_t>(mSize.width) * 4 * mSize.height;
+  }
+
+ protected:
+  DepthAndStencilBuffer(GLContext* gl, const gfx::IntSize& size, GLuint depthRB,
+                        GLuint stencilRB);
+  ~DepthAndStencilBuffer();
+};
+
+class MozFramebuffer final {
+  const WeakPtr<GLContext> mWeakGL;
+
+ public:
+  const gfx::IntSize mSize;
+  const uint32_t mSamples;
+  const GLuint mFB;
+  const GLenum mColorTarget;
+
+ private:
+  const RefPtr<DepthAndStencilBuffer> mDepthAndStencilBuffer;
+  const GLuint mColorName;
+
+ public:
+  // Create a new framebuffer with the specified properties.
+  static UniquePtr<MozFramebuffer> Create(GLContext* gl,
+                                          const gfx::IntSize& size,
+                                          uint32_t samples, bool depthStencil);
+
+  // Create a new framebuffer backed by an existing texture or buffer.
+  // Assumes that gl is the current context.
+  static UniquePtr<MozFramebuffer> CreateForBacking(
+      GLContext* gl, const gfx::IntSize& size, uint32_t samples,
+      bool depthStencil, GLenum colorTarget, GLuint colorName);
+
+  // Create a new framebuffer backed by an existing texture or buffer.
+  // Use the same GLContext, size, and samples as framebufferToShareWith.
+  // The new framebuffer will share its depth and stencil buffer with
+  // framebufferToShareWith. The depth and stencil buffers will be destroyed
+  // once the last MozFramebuffer using them is destroyed.
+  static UniquePtr<MozFramebuffer> CreateForBackingWithSharedDepthAndStencil(
+      const gfx::IntSize& size, const uint32_t samples, GLenum colorTarget,
+      GLuint colorName,
+      const RefPtr<DepthAndStencilBuffer>& depthAndStencilBuffer);
+
+ private:
+  MozFramebuffer(GLContext* gl, const gfx::IntSize& size, GLuint fb,
+                 uint32_t samples,
+                 RefPtr<DepthAndStencilBuffer> depthAndStencilBuffer,
+                 GLenum colorTarget, GLuint colorName);
+
+  // gl must be the current context when this is called.
+  static UniquePtr<MozFramebuffer> CreateImpl(
+      GLContext* const gl, const gfx::IntSize& size, const uint32_t samples,
+      const RefPtr<DepthAndStencilBuffer>& depthAndStencilBuffer,
+      const GLenum colorTarget, const GLuint colorName);
+
+ public:
+  ~MozFramebuffer();
+
+  GLuint ColorTex() const {
+    if (mColorTarget == LOCAL_GL_RENDERBUFFER) return 0;
+    return mColorName;
+  }
+  const auto& GetDepthAndStencilBuffer() const {
+    return mDepthAndStencilBuffer;
+  }
+  bool HasDepth() const;
+  bool HasStencil() const;
+};
+
+}  // namespace gl
+}  // namespace mozilla
+
+#endif  // MOZ_FRAMEBUFFER_H_