michael@0: 
michael@0: /*
michael@0:  * Copyright 2013 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: #include "gl/SkGLContextHelper.h"
michael@0: #include "GrGLUtil.h"
michael@0: 
michael@0: SkGLContextHelper::SkGLContextHelper()
michael@0:     : fFBO(0)
michael@0:     , fColorBufferID(0)
michael@0:     , fDepthStencilBufferID(0)
michael@0:     , fGL(NULL) {
michael@0: }
michael@0: 
michael@0: SkGLContextHelper::~SkGLContextHelper() {
michael@0: 
michael@0:     if (fGL) {
michael@0:         // TODO: determine why DeleteFramebuffers is generating a GL error in tests
michael@0:         SK_GL_NOERRCHECK(*this, DeleteFramebuffers(1, &fFBO));
michael@0:         SK_GL_NOERRCHECK(*this, DeleteRenderbuffers(1, &fColorBufferID));
michael@0:         SK_GL_NOERRCHECK(*this, DeleteRenderbuffers(1, &fDepthStencilBufferID));
michael@0:     }
michael@0: 
michael@0:     SkSafeUnref(fGL);
michael@0: }
michael@0: 
michael@0: bool SkGLContextHelper::init(int width, int height) {
michael@0:     if (fGL) {
michael@0:         fGL->unref();
michael@0:         this->destroyGLContext();
michael@0:     }
michael@0: 
michael@0:     fGL = this->createGLContext();
michael@0:     if (fGL) {
michael@0:         const GrGLubyte* temp;
michael@0: 
michael@0:         if (!fGL->validate()) {
michael@0:             fGL = NULL;
michael@0:             this->destroyGLContext();
michael@0:             return false;
michael@0:         }
michael@0: 
michael@0:         SK_GL_RET(*this, temp, GetString(GR_GL_VERSION));
michael@0:         const char* versionStr = reinterpret_cast<const char*>(temp);
michael@0:         GrGLVersion version = GrGLGetVersionFromString(versionStr);
michael@0: 
michael@0:         // clear any existing GL erorrs
michael@0:         GrGLenum error;
michael@0:         do {
michael@0:             SK_GL_RET(*this, error, GetError());
michael@0:         } while (GR_GL_NO_ERROR != error);
michael@0: 
michael@0:         SK_GL(*this, GenFramebuffers(1, &fFBO));
michael@0:         SK_GL(*this, BindFramebuffer(GR_GL_FRAMEBUFFER, fFBO));
michael@0:         SK_GL(*this, GenRenderbuffers(1, &fColorBufferID));
michael@0:         SK_GL(*this, BindRenderbuffer(GR_GL_RENDERBUFFER, fColorBufferID));
michael@0:         if (kGLES_GrGLStandard == this->gl()->fStandard) {
michael@0:             SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER,
michael@0:                                              GR_GL_RGBA8,
michael@0:                                              width, height));
michael@0:         } else {
michael@0:             SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER,
michael@0:                                              GR_GL_RGBA,
michael@0:                                              width, height));
michael@0:         }
michael@0:         SK_GL(*this, FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
michael@0:                                              GR_GL_COLOR_ATTACHMENT0,
michael@0:                                              GR_GL_RENDERBUFFER,
michael@0:                                              fColorBufferID));
michael@0:         SK_GL(*this, GenRenderbuffers(1, &fDepthStencilBufferID));
michael@0:         SK_GL(*this, BindRenderbuffer(GR_GL_RENDERBUFFER, fDepthStencilBufferID));
michael@0: 
michael@0:         // Some drivers that support packed depth stencil will only succeed
michael@0:         // in binding a packed format an FBO. However, we can't rely on packed
michael@0:         // depth stencil being available.
michael@0:         bool supportsPackedDepthStencil;
michael@0:         if (kGLES_GrGLStandard == this->gl()->fStandard) {
michael@0:             supportsPackedDepthStencil = version >= GR_GL_VER(3,0) ||
michael@0:                                          this->hasExtension("GL_OES_packed_depth_stencil");
michael@0:         } else {
michael@0:             supportsPackedDepthStencil = version >= GR_GL_VER(3,0) ||
michael@0:                                          this->hasExtension("GL_EXT_packed_depth_stencil") ||
michael@0:                                          this->hasExtension("GL_ARB_framebuffer_object");
michael@0:         }
michael@0: 
michael@0:         if (supportsPackedDepthStencil) {
michael@0:             // ES2 requires sized internal formats for RenderbufferStorage
michael@0:             // On Desktop we let the driver decide.
michael@0:             GrGLenum format = kGLES_GrGLStandard == this->gl()->fStandard ?
michael@0:                                     GR_GL_DEPTH24_STENCIL8 :
michael@0:                                     GR_GL_DEPTH_STENCIL;
michael@0:             SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER,
michael@0:                                              format,
michael@0:                                              width, height));
michael@0:             SK_GL(*this, FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
michael@0:                                                  GR_GL_DEPTH_ATTACHMENT,
michael@0:                                                  GR_GL_RENDERBUFFER,
michael@0:                                                  fDepthStencilBufferID));
michael@0:         } else {
michael@0:             GrGLenum format = kGLES_GrGLStandard == this->gl()->fStandard ? GR_GL_STENCIL_INDEX8 :
michael@0:                                                                           GR_GL_STENCIL_INDEX;
michael@0:             SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER,
michael@0:                                              format,
michael@0:                                              width, height));
michael@0:         }
michael@0:         SK_GL(*this, FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
michael@0:                                              GR_GL_STENCIL_ATTACHMENT,
michael@0:                                              GR_GL_RENDERBUFFER,
michael@0:                                              fDepthStencilBufferID));
michael@0:         SK_GL(*this, Viewport(0, 0, width, height));
michael@0:         SK_GL(*this, ClearStencil(0));
michael@0:         SK_GL(*this, Clear(GR_GL_STENCIL_BUFFER_BIT));
michael@0: 
michael@0:         SK_GL_RET(*this, error, GetError());
michael@0:         GrGLenum status;
michael@0:         SK_GL_RET(*this, status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER));
michael@0: 
michael@0:         if (GR_GL_FRAMEBUFFER_COMPLETE != status ||
michael@0:             GR_GL_NO_ERROR != error) {
michael@0:             fFBO = 0;
michael@0:             fColorBufferID = 0;
michael@0:             fDepthStencilBufferID = 0;
michael@0:             fGL->unref();
michael@0:             fGL = NULL;
michael@0:             this->destroyGLContext();
michael@0:             return false;
michael@0:         } else {
michael@0:             return true;
michael@0:         }
michael@0:     }
michael@0:     return false;
michael@0: }