1 files changed, 260 insertions, 0 deletions
diff --git a/gfx/gl/ScopedGLHelpers.h b/gfx/gl/ScopedGLHelpers.h
new file mode 100644
index 0000000000..6e3b9867bc
--- /dev/null
+++ b/gfx/gl/ScopedGLHelpers.h
@@ -0,0 +1,260 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 SCOPEDGLHELPERS_H_
+#define SCOPEDGLHELPERS_H_
+
+#include "GLDefs.h"
+#include "mozilla/UniquePtr.h"
+
+namespace mozilla {
+namespace gl {
+
+class GLContext;
+
+#ifdef DEBUG
+bool IsContextCurrent(GLContext* gl);
+#endif
+
+// Wraps glEnable/Disable.
+struct ScopedGLState final {
+ private:
+  GLContext* const mGL;
+  const GLenum mCapability;
+  bool mOldState;
+
+ public:
+  // Use |newState = true| to enable, |false| to disable.
+  ScopedGLState(GLContext* aGL, GLenum aCapability, bool aNewState);
+  // variant that doesn't change state; simply records existing state to be
+  // restored by the destructor
+  ScopedGLState(GLContext* aGL, GLenum aCapability);
+  ~ScopedGLState();
+};
+
+// Saves and restores with GetUserBoundFB and BindUserFB.
+struct ScopedBindFramebuffer final {
+ private:
+  GLContext* const mGL;
+  GLuint mOldReadFB;
+  GLuint mOldDrawFB;
+
+  void Init();
+
+ public:
+  explicit ScopedBindFramebuffer(GLContext* aGL);
+  ScopedBindFramebuffer(GLContext* aGL, GLuint aNewFB);
+  ~ScopedBindFramebuffer();
+};
+
+struct ScopedBindTextureUnit final {
+ private:
+  GLContext* const mGL;
+  GLenum mOldTexUnit;
+
+ public:
+  ScopedBindTextureUnit(GLContext* aGL, GLenum aTexUnit);
+  ~ScopedBindTextureUnit();
+};
+
+struct ScopedTexture final {
+ private:
+  GLContext* const mGL;
+  GLuint mTexture;
+
+ public:
+  explicit ScopedTexture(GLContext* aGL);
+  ~ScopedTexture();
+
+  GLuint Texture() const { return mTexture; }
+  operator GLuint() const { return mTexture; }
+};
+
+struct ScopedFramebuffer final {
+ private:
+  GLContext* const mGL;
+  GLuint mFB;
+
+ public:
+  explicit ScopedFramebuffer(GLContext* aGL);
+  ~ScopedFramebuffer();
+
+  const auto& FB() const { return mFB; }
+  operator GLuint() const { return mFB; }
+};
+
+struct ScopedRenderbuffer final {
+ private:
+  GLContext* const mGL;
+  GLuint mRB;
+
+ public:
+  explicit ScopedRenderbuffer(GLContext* aGL);
+  ~ScopedRenderbuffer();
+
+  GLuint RB() { return mRB; }
+  operator GLuint() const { return mRB; }
+};
+
+struct ScopedBindTexture final {
+ private:
+  GLContext* const mGL;
+  const GLenum mTarget;
+  const GLuint mOldTex;
+
+ public:
+  ScopedBindTexture(GLContext* aGL, GLuint aNewTex,
+                    GLenum aTarget = LOCAL_GL_TEXTURE_2D);
+  ~ScopedBindTexture();
+};
+
+struct ScopedBindRenderbuffer final {
+ private:
+  GLContext* const mGL;
+  GLuint mOldRB;
+
+ private:
+  void Init();
+
+ public:
+  explicit ScopedBindRenderbuffer(GLContext* aGL);
+  ScopedBindRenderbuffer(GLContext* aGL, GLuint aNewRB);
+  ~ScopedBindRenderbuffer();
+};
+
+struct ScopedFramebufferForTexture final {
+ private:
+  GLContext* const mGL;
+  bool mComplete;  // True if the framebuffer we create is complete.
+  GLuint mFB;
+
+ public:
+  ScopedFramebufferForTexture(GLContext* aGL, GLuint aTexture,
+                              GLenum aTarget = LOCAL_GL_TEXTURE_2D);
+  ~ScopedFramebufferForTexture();
+
+  bool IsComplete() const { return mComplete; }
+
+  GLuint FB() const {
+    MOZ_GL_ASSERT(mGL, IsComplete());
+    return mFB;
+  }
+};
+
+struct ScopedFramebufferForRenderbuffer final {
+ private:
+  GLContext* const mGL;
+  bool mComplete;  // True if the framebuffer we create is complete.
+  GLuint mFB;
+
+ public:
+  ScopedFramebufferForRenderbuffer(GLContext* aGL, GLuint aRB);
+  ~ScopedFramebufferForRenderbuffer();
+
+  bool IsComplete() const { return mComplete; }
+  GLuint FB() const {
+    MOZ_GL_ASSERT(mGL, IsComplete());
+    return mFB;
+  }
+};
+
+struct ScopedViewportRect final {
+ private:
+  GLContext* const mGL;
+  GLint mSavedViewportRect[4];
+
+ public:
+  ScopedViewportRect(GLContext* aGL, GLint x, GLint y, GLsizei width,
+                     GLsizei height);
+  ~ScopedViewportRect();
+};
+
+struct ScopedScissorRect final {
+ private:
+  GLContext* const mGL;
+  GLint mSavedScissorRect[4];
+
+ public:
+  ScopedScissorRect(GLContext* aGL, GLint x, GLint y, GLsizei width,
+                    GLsizei height);
+  explicit ScopedScissorRect(GLContext* aGL);
+  ~ScopedScissorRect();
+};
+
+struct ScopedVertexAttribPointer final {
+ private:
+  GLContext* const mGL;
+  GLuint mAttribIndex;
+  GLint mAttribEnabled;
+  GLint mAttribSize;
+  GLint mAttribStride;
+  GLint mAttribType;
+  GLint mAttribNormalized;
+  GLint mAttribBufferBinding;
+  void* mAttribPointer;
+  GLuint mBoundBuffer;
+
+ public:
+  ScopedVertexAttribPointer(GLContext* aGL, GLuint index, GLint size,
+                            GLenum type, realGLboolean normalized,
+                            GLsizei stride, GLuint buffer,
+                            const GLvoid* pointer);
+  explicit ScopedVertexAttribPointer(GLContext* aGL, GLuint index);
+  ~ScopedVertexAttribPointer();
+
+ private:
+  void WrapImpl(GLuint index);
+};
+
+struct ScopedPackState final {
+ private:
+  GLContext* const mGL;
+  GLint mAlignment;
+
+  GLuint mPixelBuffer;
+  GLint mRowLength;
+  GLint mSkipPixels;
+  GLint mSkipRows;
+
+ public:
+  explicit ScopedPackState(GLContext* gl);
+  ~ScopedPackState();
+
+  // Returns whether the stride was handled successfully.
+  bool SetForWidthAndStrideRGBA(GLsizei aWidth, GLsizei aStride);
+};
+
+struct ResetUnpackState final {
+ private:
+  GLContext* const mGL;
+  GLuint mAlignment;
+
+  GLuint mPBO;
+  GLuint mRowLength;
+  GLuint mImageHeight;
+  GLuint mSkipPixels;
+  GLuint mSkipRows;
+  GLuint mSkipImages;
+
+ public:
+  explicit ResetUnpackState(GLContext* gl);
+  ~ResetUnpackState();
+};
+
+struct ScopedBindPBO final {
+ private:
+  GLContext* const mGL;
+  const GLenum mTarget;
+  const GLuint mPBO;
+
+ public:
+  ScopedBindPBO(GLContext* gl, GLenum target);
+  ~ScopedBindPBO();
+};
+
+} /* namespace gl */
+} /* namespace mozilla */
+
+#endif /* SCOPEDGLHELPERS_H_ */