1 2/* 3 * Copyright 2013 Google Inc. 4 * 5 * Use of this source code is governed by a BSD-style license that can be 6 * found in the LICENSE file. 7 */ 8#include "gl/SkGLContextHelper.h" 9#include "GrGLUtil.h" 10 11SK_DEFINE_INST_COUNT(SkGLContextHelper) 12 13SkGLContextHelper::SkGLContextHelper() 14 : fFBO(0) 15 , fColorBufferID(0) 16 , fDepthStencilBufferID(0) 17 , fGL(NULL) { 18} 19 20SkGLContextHelper::~SkGLContextHelper() { 21 22 if (fGL) { 23 // TODO: determine why DeleteFramebuffers is generating a GL error in tests 24 SK_GL_NOERRCHECK(*this, DeleteFramebuffers(1, &fFBO)); 25 SK_GL_NOERRCHECK(*this, DeleteRenderbuffers(1, &fColorBufferID)); 26 SK_GL_NOERRCHECK(*this, DeleteRenderbuffers(1, &fDepthStencilBufferID)); 27 } 28 29 SkSafeUnref(fGL); 30} 31 32bool SkGLContextHelper::init(int width, int height) { 33 if (fGL) { 34 fGL->unref(); 35 this->destroyGLContext(); 36 } 37 38 fGL = this->createGLContext(); 39 if (fGL) { 40 const GrGLubyte* temp; 41 42 GrGLBinding bindingInUse = GrGLGetBindingInUse(this->gl()); 43 44 if (!fGL->validate(bindingInUse) || !fExtensions.init(bindingInUse, fGL)) { 45 fGL = NULL; 46 this->destroyGLContext(); 47 return false; 48 } 49 50 SK_GL_RET(*this, temp, GetString(GR_GL_VERSION)); 51 const char* versionStr = reinterpret_cast<const char*>(temp); 52 GrGLVersion version = GrGLGetVersionFromString(versionStr); 53 54 // clear any existing GL erorrs 55 GrGLenum error; 56 do { 57 SK_GL_RET(*this, error, GetError()); 58 } while (GR_GL_NO_ERROR != error); 59 60 SK_GL(*this, GenFramebuffers(1, &fFBO)); 61 SK_GL(*this, BindFramebuffer(GR_GL_FRAMEBUFFER, fFBO)); 62 SK_GL(*this, GenRenderbuffers(1, &fColorBufferID)); 63 SK_GL(*this, BindRenderbuffer(GR_GL_RENDERBUFFER, fColorBufferID)); 64 if (kES2_GrGLBinding == bindingInUse) { 65 SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER, 66 GR_GL_RGBA8, 67 width, height)); 68 } else { 69 SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER, 70 GR_GL_RGBA, 71 width, height)); 72 } 73 SK_GL(*this, FramebufferRenderbuffer(GR_GL_FRAMEBUFFER, 74 GR_GL_COLOR_ATTACHMENT0, 75 GR_GL_RENDERBUFFER, 76 fColorBufferID)); 77 SK_GL(*this, GenRenderbuffers(1, &fDepthStencilBufferID)); 78 SK_GL(*this, BindRenderbuffer(GR_GL_RENDERBUFFER, fDepthStencilBufferID)); 79 80 // Some drivers that support packed depth stencil will only succeed 81 // in binding a packed format an FBO. However, we can't rely on packed 82 // depth stencil being available. 83 bool supportsPackedDepthStencil; 84 if (kES2_GrGLBinding == bindingInUse) { 85 supportsPackedDepthStencil = this->hasExtension("GL_OES_packed_depth_stencil"); 86 } else { 87 supportsPackedDepthStencil = version >= GR_GL_VER(3,0) || 88 this->hasExtension("GL_EXT_packed_depth_stencil") || 89 this->hasExtension("GL_ARB_framebuffer_object"); 90 } 91 92 if (supportsPackedDepthStencil) { 93 // ES2 requires sized internal formats for RenderbufferStorage 94 // On Desktop we let the driver decide. 95 GrGLenum format = kES2_GrGLBinding == bindingInUse ? 96 GR_GL_DEPTH24_STENCIL8 : 97 GR_GL_DEPTH_STENCIL; 98 SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER, 99 format, 100 width, height)); 101 SK_GL(*this, FramebufferRenderbuffer(GR_GL_FRAMEBUFFER, 102 GR_GL_DEPTH_ATTACHMENT, 103 GR_GL_RENDERBUFFER, 104 fDepthStencilBufferID)); 105 } else { 106 GrGLenum format = kES2_GrGLBinding == bindingInUse ? 107 GR_GL_STENCIL_INDEX8 : 108 GR_GL_STENCIL_INDEX; 109 SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER, 110 format, 111 width, height)); 112 } 113 SK_GL(*this, FramebufferRenderbuffer(GR_GL_FRAMEBUFFER, 114 GR_GL_STENCIL_ATTACHMENT, 115 GR_GL_RENDERBUFFER, 116 fDepthStencilBufferID)); 117 SK_GL(*this, Viewport(0, 0, width, height)); 118 SK_GL(*this, ClearStencil(0)); 119 SK_GL(*this, Clear(GR_GL_STENCIL_BUFFER_BIT)); 120 121 SK_GL_RET(*this, error, GetError()); 122 GrGLenum status; 123 SK_GL_RET(*this, status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER)); 124 125 if (GR_GL_FRAMEBUFFER_COMPLETE != status || 126 GR_GL_NO_ERROR != error) { 127 fFBO = 0; 128 fColorBufferID = 0; 129 fDepthStencilBufferID = 0; 130 fGL->unref(); 131 fGL = NULL; 132 this->destroyGLContext(); 133 return false; 134 } else { 135 return true; 136 } 137 } 138 return false; 139} 140