1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/gpu/gl/SkGLContextHelper.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,135 @@
1.4 +
1.5 +/*
1.6 + * Copyright 2013 Google Inc.
1.7 + *
1.8 + * Use of this source code is governed by a BSD-style license that can be
1.9 + * found in the LICENSE file.
1.10 + */
1.11 +#include "gl/SkGLContextHelper.h"
1.12 +#include "GrGLUtil.h"
1.13 +
1.14 +SkGLContextHelper::SkGLContextHelper()
1.15 + : fFBO(0)
1.16 + , fColorBufferID(0)
1.17 + , fDepthStencilBufferID(0)
1.18 + , fGL(NULL) {
1.19 +}
1.20 +
1.21 +SkGLContextHelper::~SkGLContextHelper() {
1.22 +
1.23 + if (fGL) {
1.24 + // TODO: determine why DeleteFramebuffers is generating a GL error in tests
1.25 + SK_GL_NOERRCHECK(*this, DeleteFramebuffers(1, &fFBO));
1.26 + SK_GL_NOERRCHECK(*this, DeleteRenderbuffers(1, &fColorBufferID));
1.27 + SK_GL_NOERRCHECK(*this, DeleteRenderbuffers(1, &fDepthStencilBufferID));
1.28 + }
1.29 +
1.30 + SkSafeUnref(fGL);
1.31 +}
1.32 +
1.33 +bool SkGLContextHelper::init(int width, int height) {
1.34 + if (fGL) {
1.35 + fGL->unref();
1.36 + this->destroyGLContext();
1.37 + }
1.38 +
1.39 + fGL = this->createGLContext();
1.40 + if (fGL) {
1.41 + const GrGLubyte* temp;
1.42 +
1.43 + if (!fGL->validate()) {
1.44 + fGL = NULL;
1.45 + this->destroyGLContext();
1.46 + return false;
1.47 + }
1.48 +
1.49 + SK_GL_RET(*this, temp, GetString(GR_GL_VERSION));
1.50 + const char* versionStr = reinterpret_cast<const char*>(temp);
1.51 + GrGLVersion version = GrGLGetVersionFromString(versionStr);
1.52 +
1.53 + // clear any existing GL erorrs
1.54 + GrGLenum error;
1.55 + do {
1.56 + SK_GL_RET(*this, error, GetError());
1.57 + } while (GR_GL_NO_ERROR != error);
1.58 +
1.59 + SK_GL(*this, GenFramebuffers(1, &fFBO));
1.60 + SK_GL(*this, BindFramebuffer(GR_GL_FRAMEBUFFER, fFBO));
1.61 + SK_GL(*this, GenRenderbuffers(1, &fColorBufferID));
1.62 + SK_GL(*this, BindRenderbuffer(GR_GL_RENDERBUFFER, fColorBufferID));
1.63 + if (kGLES_GrGLStandard == this->gl()->fStandard) {
1.64 + SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER,
1.65 + GR_GL_RGBA8,
1.66 + width, height));
1.67 + } else {
1.68 + SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER,
1.69 + GR_GL_RGBA,
1.70 + width, height));
1.71 + }
1.72 + SK_GL(*this, FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
1.73 + GR_GL_COLOR_ATTACHMENT0,
1.74 + GR_GL_RENDERBUFFER,
1.75 + fColorBufferID));
1.76 + SK_GL(*this, GenRenderbuffers(1, &fDepthStencilBufferID));
1.77 + SK_GL(*this, BindRenderbuffer(GR_GL_RENDERBUFFER, fDepthStencilBufferID));
1.78 +
1.79 + // Some drivers that support packed depth stencil will only succeed
1.80 + // in binding a packed format an FBO. However, we can't rely on packed
1.81 + // depth stencil being available.
1.82 + bool supportsPackedDepthStencil;
1.83 + if (kGLES_GrGLStandard == this->gl()->fStandard) {
1.84 + supportsPackedDepthStencil = version >= GR_GL_VER(3,0) ||
1.85 + this->hasExtension("GL_OES_packed_depth_stencil");
1.86 + } else {
1.87 + supportsPackedDepthStencil = version >= GR_GL_VER(3,0) ||
1.88 + this->hasExtension("GL_EXT_packed_depth_stencil") ||
1.89 + this->hasExtension("GL_ARB_framebuffer_object");
1.90 + }
1.91 +
1.92 + if (supportsPackedDepthStencil) {
1.93 + // ES2 requires sized internal formats for RenderbufferStorage
1.94 + // On Desktop we let the driver decide.
1.95 + GrGLenum format = kGLES_GrGLStandard == this->gl()->fStandard ?
1.96 + GR_GL_DEPTH24_STENCIL8 :
1.97 + GR_GL_DEPTH_STENCIL;
1.98 + SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER,
1.99 + format,
1.100 + width, height));
1.101 + SK_GL(*this, FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
1.102 + GR_GL_DEPTH_ATTACHMENT,
1.103 + GR_GL_RENDERBUFFER,
1.104 + fDepthStencilBufferID));
1.105 + } else {
1.106 + GrGLenum format = kGLES_GrGLStandard == this->gl()->fStandard ? GR_GL_STENCIL_INDEX8 :
1.107 + GR_GL_STENCIL_INDEX;
1.108 + SK_GL(*this, RenderbufferStorage(GR_GL_RENDERBUFFER,
1.109 + format,
1.110 + width, height));
1.111 + }
1.112 + SK_GL(*this, FramebufferRenderbuffer(GR_GL_FRAMEBUFFER,
1.113 + GR_GL_STENCIL_ATTACHMENT,
1.114 + GR_GL_RENDERBUFFER,
1.115 + fDepthStencilBufferID));
1.116 + SK_GL(*this, Viewport(0, 0, width, height));
1.117 + SK_GL(*this, ClearStencil(0));
1.118 + SK_GL(*this, Clear(GR_GL_STENCIL_BUFFER_BIT));
1.119 +
1.120 + SK_GL_RET(*this, error, GetError());
1.121 + GrGLenum status;
1.122 + SK_GL_RET(*this, status, CheckFramebufferStatus(GR_GL_FRAMEBUFFER));
1.123 +
1.124 + if (GR_GL_FRAMEBUFFER_COMPLETE != status ||
1.125 + GR_GL_NO_ERROR != error) {
1.126 + fFBO = 0;
1.127 + fColorBufferID = 0;
1.128 + fDepthStencilBufferID = 0;
1.129 + fGL->unref();
1.130 + fGL = NULL;
1.131 + this->destroyGLContext();
1.132 + return false;
1.133 + } else {
1.134 + return true;
1.135 + }
1.136 + }
1.137 + return false;
1.138 +}
