michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "GLContext.h"
michael@0: #include "ScopedGLHelpers.h"
michael@0: 
michael@0: namespace mozilla {
michael@0: namespace gl {
michael@0: 
michael@0: /* ScopedGLState - Wraps glEnable/glDisable. **********************************/
michael@0: 
michael@0: // Use |newState = true| to enable, |false| to disable.
michael@0: ScopedGLState::ScopedGLState(GLContext* aGL, GLenum aCapability, bool aNewState)
michael@0:     : ScopedGLWrapper<ScopedGLState>(aGL)
michael@0:     , mCapability(aCapability)
michael@0: {
michael@0:     mOldState = mGL->fIsEnabled(mCapability);
michael@0: 
michael@0:     // Early out if we're already in the right state.
michael@0:     if (aNewState == mOldState)
michael@0:         return;
michael@0: 
michael@0:     if (aNewState) {
michael@0:         mGL->fEnable(mCapability);
michael@0:     } else {
michael@0:         mGL->fDisable(mCapability);
michael@0:     }
michael@0: }
michael@0: 
michael@0: ScopedGLState::ScopedGLState(GLContext* aGL, GLenum aCapability)
michael@0:     : ScopedGLWrapper<ScopedGLState>(aGL)
michael@0:     , mCapability(aCapability)
michael@0: {
michael@0:     mOldState = mGL->fIsEnabled(mCapability);
michael@0: }
michael@0: 
michael@0: void
michael@0: ScopedGLState::UnwrapImpl()
michael@0: {
michael@0:     if (mOldState) {
michael@0:         mGL->fEnable(mCapability);
michael@0:     } else {
michael@0:         mGL->fDisable(mCapability);
michael@0:     }
michael@0: }
michael@0: 
michael@0: 
michael@0: /* ScopedBindFramebuffer - Saves and restores with GetUserBoundFB and BindUserFB. */
michael@0: 
michael@0: void
michael@0: ScopedBindFramebuffer::Init()
michael@0: {
michael@0:     mOldFB = mGL->GetFB();
michael@0: }
michael@0: 
michael@0: ScopedBindFramebuffer::ScopedBindFramebuffer(GLContext* aGL)
michael@0:     : ScopedGLWrapper<ScopedBindFramebuffer>(aGL)
michael@0: {
michael@0:     Init();
michael@0: }
michael@0: 
michael@0: ScopedBindFramebuffer::ScopedBindFramebuffer(GLContext* aGL, GLuint aNewFB)
michael@0:     : ScopedGLWrapper<ScopedBindFramebuffer>(aGL)
michael@0: {
michael@0:     Init();
michael@0:     mGL->BindFB(aNewFB);
michael@0: }
michael@0: 
michael@0: void
michael@0: ScopedBindFramebuffer::UnwrapImpl()
michael@0: {
michael@0:     // Check that we're not falling out of scope after the current context changed.
michael@0:     MOZ_ASSERT(mGL->IsCurrent());
michael@0: 
michael@0:     mGL->BindFB(mOldFB);
michael@0: }
michael@0: 
michael@0: 
michael@0: /* ScopedBindTextureUnit ******************************************************/
michael@0: 
michael@0: ScopedBindTextureUnit::ScopedBindTextureUnit(GLContext* aGL, GLenum aTexUnit)
michael@0:     : ScopedGLWrapper<ScopedBindTextureUnit>(aGL)
michael@0: {
michael@0:     MOZ_ASSERT(aTexUnit >= LOCAL_GL_TEXTURE0);
michael@0:     mGL->GetUIntegerv(LOCAL_GL_ACTIVE_TEXTURE, &mOldTexUnit);
michael@0:     mGL->fActiveTexture(aTexUnit);
michael@0: }
michael@0: 
michael@0: void
michael@0: ScopedBindTextureUnit::UnwrapImpl() {
michael@0:     // Check that we're not falling out of scope after the current context changed.
michael@0:     MOZ_ASSERT(mGL->IsCurrent());
michael@0: 
michael@0:     mGL->fActiveTexture(mOldTexUnit);
michael@0: }
michael@0: 
michael@0: 
michael@0: /* ScopedTexture **************************************************************/
michael@0: 
michael@0: ScopedTexture::ScopedTexture(GLContext* aGL)
michael@0:     : ScopedGLWrapper<ScopedTexture>(aGL)
michael@0: {
michael@0:     mGL->fGenTextures(1, &mTexture);
michael@0: }
michael@0: 
michael@0: void
michael@0: ScopedTexture::UnwrapImpl()
michael@0: {
michael@0:     // Check that we're not falling out of scope after
michael@0:     // the current context changed.
michael@0:     MOZ_ASSERT(mGL->IsCurrent());
michael@0: 
michael@0:     mGL->fDeleteTextures(1, &mTexture);
michael@0: }
michael@0: 
michael@0: /* ScopedBindTexture **********************************************************/
michael@0: void
michael@0: ScopedBindTexture::Init(GLenum aTarget)
michael@0: {
michael@0:     mTarget = aTarget;
michael@0:     mOldTex = 0;
michael@0:     GLenum bindingTarget = (aTarget == LOCAL_GL_TEXTURE_2D) ? LOCAL_GL_TEXTURE_BINDING_2D
michael@0:                          : (aTarget == LOCAL_GL_TEXTURE_RECTANGLE_ARB) ? LOCAL_GL_TEXTURE_BINDING_RECTANGLE_ARB
michael@0:                          : (aTarget == LOCAL_GL_TEXTURE_CUBE_MAP) ? LOCAL_GL_TEXTURE_BINDING_CUBE_MAP
michael@0:                          : (aTarget == LOCAL_GL_TEXTURE_EXTERNAL) ? LOCAL_GL_TEXTURE_BINDING_EXTERNAL
michael@0:                          : LOCAL_GL_NONE;
michael@0:     MOZ_ASSERT(bindingTarget != LOCAL_GL_NONE);
michael@0:     mGL->GetUIntegerv(bindingTarget, &mOldTex);
michael@0: }
michael@0: 
michael@0: ScopedBindTexture::ScopedBindTexture(GLContext* aGL, GLuint aNewTex, GLenum aTarget)
michael@0:         : ScopedGLWrapper<ScopedBindTexture>(aGL)
michael@0:     {
michael@0:         Init(aTarget);
michael@0:         mGL->fBindTexture(aTarget, aNewTex);
michael@0:     }
michael@0: 
michael@0: void
michael@0: ScopedBindTexture::UnwrapImpl()
michael@0: {
michael@0:     // Check that we're not falling out of scope after the current context changed.
michael@0:     MOZ_ASSERT(mGL->IsCurrent());
michael@0: 
michael@0:     mGL->fBindTexture(mTarget, mOldTex);
michael@0: }
michael@0: 
michael@0: 
michael@0: /* ScopedBindRenderbuffer *****************************************************/
michael@0: 
michael@0: void
michael@0: ScopedBindRenderbuffer::Init()
michael@0: {
michael@0:     mOldRB = 0;
michael@0:     mGL->GetUIntegerv(LOCAL_GL_RENDERBUFFER_BINDING, &mOldRB);
michael@0: }
michael@0: 
michael@0: ScopedBindRenderbuffer::ScopedBindRenderbuffer(GLContext* aGL)
michael@0:         : ScopedGLWrapper<ScopedBindRenderbuffer>(aGL)
michael@0: {
michael@0:     Init();
michael@0: }
michael@0: 
michael@0: ScopedBindRenderbuffer::ScopedBindRenderbuffer(GLContext* aGL, GLuint aNewRB)
michael@0:     : ScopedGLWrapper<ScopedBindRenderbuffer>(aGL)
michael@0: {
michael@0:     Init();
michael@0:     mGL->fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, aNewRB);
michael@0: }
michael@0: 
michael@0: void
michael@0: ScopedBindRenderbuffer::UnwrapImpl() {
michael@0:     // Check that we're not falling out of scope after the current context changed.
michael@0:     MOZ_ASSERT(mGL->IsCurrent());
michael@0: 
michael@0:     mGL->fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, mOldRB);
michael@0: }
michael@0: 
michael@0: 
michael@0: /* ScopedFramebufferForTexture ************************************************/
michael@0: ScopedFramebufferForTexture::ScopedFramebufferForTexture(GLContext* aGL,
michael@0:                                                          GLuint aTexture,
michael@0:                                                          GLenum aTarget)
michael@0:     : ScopedGLWrapper<ScopedFramebufferForTexture>(aGL)
michael@0:     , mComplete(false)
michael@0:     , mFB(0)
michael@0: {
michael@0:     mGL->fGenFramebuffers(1, &mFB);
michael@0:     ScopedBindFramebuffer autoFB(aGL, mFB);
michael@0:     mGL->fFramebufferTexture2D(LOCAL_GL_FRAMEBUFFER,
michael@0:                                LOCAL_GL_COLOR_ATTACHMENT0,
michael@0:                                aTarget,
michael@0:                                aTexture,
michael@0:                                0);
michael@0: 
michael@0:     GLenum status = mGL->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
michael@0:     if (status == LOCAL_GL_FRAMEBUFFER_COMPLETE) {
michael@0:         mComplete = true;
michael@0:     } else {
michael@0:         mGL->fDeleteFramebuffers(1, &mFB);
michael@0:         mFB = 0;
michael@0:     }
michael@0: }
michael@0: 
michael@0: void ScopedFramebufferForTexture::UnwrapImpl()
michael@0: {
michael@0:     if (!mFB)
michael@0:         return;
michael@0: 
michael@0:     mGL->fDeleteFramebuffers(1, &mFB);
michael@0:     mFB = 0;
michael@0: }
michael@0: 
michael@0: 
michael@0: /* ScopedFramebufferForRenderbuffer *******************************************/
michael@0: 
michael@0: 
michael@0: ScopedFramebufferForRenderbuffer::ScopedFramebufferForRenderbuffer(GLContext* aGL,
michael@0:                                                                    GLuint aRB)
michael@0:     : ScopedGLWrapper<ScopedFramebufferForRenderbuffer>(aGL)
michael@0:     , mComplete(false)
michael@0:     , mFB(0)
michael@0: {
michael@0:     mGL->fGenFramebuffers(1, &mFB);
michael@0:     ScopedBindFramebuffer autoFB(aGL, mFB);
michael@0:     mGL->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER,
michael@0:                                   LOCAL_GL_COLOR_ATTACHMENT0,
michael@0:                                   LOCAL_GL_RENDERBUFFER,
michael@0:                                   aRB);
michael@0: 
michael@0:     GLenum status = mGL->fCheckFramebufferStatus(LOCAL_GL_FRAMEBUFFER);
michael@0:     if (status == LOCAL_GL_FRAMEBUFFER_COMPLETE) {
michael@0:         mComplete = true;
michael@0:     } else {
michael@0:         mGL->fDeleteFramebuffers(1, &mFB);
michael@0:         mFB = 0;
michael@0:     }
michael@0: }
michael@0: 
michael@0: void
michael@0: ScopedFramebufferForRenderbuffer::UnwrapImpl()
michael@0: {
michael@0:     if (!mFB)
michael@0:         return;
michael@0: 
michael@0:     mGL->fDeleteFramebuffers(1, &mFB);
michael@0:     mFB = 0;
michael@0: }
michael@0: 
michael@0: /* ScopedViewportRect *********************************************************/
michael@0: 
michael@0: ScopedViewportRect::ScopedViewportRect(GLContext* aGL,
michael@0:                                        GLint x, GLint y,
michael@0:                                        GLsizei width, GLsizei height)
michael@0:   : ScopedGLWrapper<ScopedViewportRect>(aGL)
michael@0: {
michael@0:   mGL->fGetIntegerv(LOCAL_GL_VIEWPORT, mSavedViewportRect);
michael@0:   mGL->fViewport(x, y, width, height);
michael@0: }
michael@0: 
michael@0: void ScopedViewportRect::UnwrapImpl()
michael@0: {
michael@0:   mGL->fViewport(mSavedViewportRect[0],
michael@0:                  mSavedViewportRect[1],
michael@0:                  mSavedViewportRect[2],
michael@0:                  mSavedViewportRect[3]);
michael@0: }
michael@0: 
michael@0: /* ScopedScissorRect **********************************************************/
michael@0: 
michael@0: ScopedScissorRect::ScopedScissorRect(GLContext* aGL,
michael@0:                                      GLint x, GLint y,
michael@0:                                      GLsizei width, GLsizei height)
michael@0:   : ScopedGLWrapper<ScopedScissorRect>(aGL)
michael@0: {
michael@0:   mGL->fGetIntegerv(LOCAL_GL_SCISSOR_BOX, mSavedScissorRect);
michael@0:   mGL->fScissor(x, y, width, height);
michael@0: }
michael@0: 
michael@0: ScopedScissorRect::ScopedScissorRect(GLContext* aGL)
michael@0:   : ScopedGLWrapper<ScopedScissorRect>(aGL)
michael@0: {
michael@0:   mGL->fGetIntegerv(LOCAL_GL_SCISSOR_BOX, mSavedScissorRect);
michael@0: }
michael@0: 
michael@0: void ScopedScissorRect::UnwrapImpl()
michael@0: {
michael@0:   mGL->fScissor(mSavedScissorRect[0],
michael@0:                 mSavedScissorRect[1],
michael@0:                 mSavedScissorRect[2],
michael@0:                 mSavedScissorRect[3]);
michael@0: }
michael@0: 
michael@0: } /* namespace gl */
michael@0: } /* namespace mozilla */