1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/content/canvas/src/WebGLRenderbuffer.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,244 @@
1.4 +/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#include "WebGLContext.h"
1.10 +#include "WebGLRenderbuffer.h"
1.11 +#include "WebGLTexture.h"
1.12 +#include "mozilla/dom/WebGLRenderingContextBinding.h"
1.13 +#include "GLContext.h"
1.14 +#include "ScopedGLHelpers.h"
1.15 +
1.16 +using namespace mozilla;
1.17 +using namespace mozilla::gl;
1.18 +
1.19 +static GLenum
1.20 +DepthStencilDepthFormat(GLContext* gl) {
1.21 + // We might not be able to get 24-bit, so let's pretend!
1.22 + if (gl->IsGLES() && !gl->IsExtensionSupported(gl::GLContext::OES_depth24))
1.23 + return LOCAL_GL_DEPTH_COMPONENT16;
1.24 +
1.25 + return LOCAL_GL_DEPTH_COMPONENT24;
1.26 +}
1.27 +
1.28 +static bool
1.29 +SupportsDepthStencil(GLContext* gl) {
1.30 + return gl->IsExtensionSupported(GLContext::EXT_packed_depth_stencil) ||
1.31 + gl->IsExtensionSupported(GLContext::OES_packed_depth_stencil);
1.32 +}
1.33 +
1.34 +static bool
1.35 +NeedsDepthStencilEmu(GLContext* gl, GLenum internalFormat) {
1.36 + MOZ_ASSERT(internalFormat != LOCAL_GL_DEPTH_STENCIL);
1.37 + if (internalFormat != LOCAL_GL_DEPTH24_STENCIL8)
1.38 + return false;
1.39 +
1.40 + return !SupportsDepthStencil(gl);
1.41 +}
1.42 +
1.43 +JSObject*
1.44 +WebGLRenderbuffer::WrapObject(JSContext *cx) {
1.45 + return dom::WebGLRenderbufferBinding::Wrap(cx, this);
1.46 +}
1.47 +
1.48 +WebGLRenderbuffer::WebGLRenderbuffer(WebGLContext *context)
1.49 + : WebGLContextBoundObject(context)
1.50 + , mPrimaryRB(0)
1.51 + , mSecondaryRB(0)
1.52 + , mInternalFormat(0)
1.53 + , mInternalFormatForGL(0)
1.54 + , mHasEverBeenBound(false)
1.55 + , mImageDataStatus(WebGLImageDataStatus::NoImageData)
1.56 +{
1.57 + SetIsDOMBinding();
1.58 + mContext->MakeContextCurrent();
1.59 +
1.60 + mContext->gl->fGenRenderbuffers(1, &mPrimaryRB);
1.61 + if (!SupportsDepthStencil(mContext->gl))
1.62 + mContext->gl->fGenRenderbuffers(1, &mSecondaryRB);
1.63 +
1.64 + mContext->mRenderbuffers.insertBack(this);
1.65 +}
1.66 +
1.67 +void
1.68 +WebGLRenderbuffer::Delete() {
1.69 + mContext->MakeContextCurrent();
1.70 +
1.71 + mContext->gl->fDeleteRenderbuffers(1, &mPrimaryRB);
1.72 + if (mSecondaryRB)
1.73 + mContext->gl->fDeleteRenderbuffers(1, &mSecondaryRB);
1.74 +
1.75 + LinkedListElement<WebGLRenderbuffer>::removeFrom(mContext->mRenderbuffers);
1.76 +}
1.77 +
1.78 +int64_t
1.79 +WebGLRenderbuffer::MemoryUsage() const {
1.80 + int64_t pixels = int64_t(Width()) * int64_t(Height());
1.81 +
1.82 + GLenum primaryFormat = InternalFormatForGL();
1.83 + // If there is no defined format, we're not taking up any memory
1.84 + if (!primaryFormat) {
1.85 + return 0;
1.86 + }
1.87 +
1.88 + int64_t secondarySize = 0;
1.89 + if (mSecondaryRB) {
1.90 + if (NeedsDepthStencilEmu(mContext->gl, primaryFormat)) {
1.91 + primaryFormat = DepthStencilDepthFormat(mContext->gl);
1.92 + secondarySize = 1*pixels; // STENCIL_INDEX8
1.93 + } else {
1.94 + secondarySize = 1*1*2; // 1x1xRGBA4
1.95 + }
1.96 + }
1.97 +
1.98 + int64_t primarySize = 0;
1.99 + switch (primaryFormat) {
1.100 + case LOCAL_GL_STENCIL_INDEX8:
1.101 + primarySize = 1*pixels;
1.102 + break;
1.103 + case LOCAL_GL_RGBA4:
1.104 + case LOCAL_GL_RGB5_A1:
1.105 + case LOCAL_GL_RGB565:
1.106 + case LOCAL_GL_DEPTH_COMPONENT16:
1.107 + primarySize = 2*pixels;
1.108 + break;
1.109 + case LOCAL_GL_RGB8:
1.110 + case LOCAL_GL_DEPTH_COMPONENT24:
1.111 + primarySize = 3*pixels;
1.112 + break;
1.113 + case LOCAL_GL_RGBA8:
1.114 + case LOCAL_GL_SRGB8_ALPHA8_EXT:
1.115 + case LOCAL_GL_DEPTH24_STENCIL8:
1.116 + case LOCAL_GL_DEPTH_COMPONENT32:
1.117 + primarySize = 4*pixels;
1.118 + break;
1.119 + case LOCAL_GL_RGB16F:
1.120 + primarySize = 2*3*pixels;
1.121 + break;
1.122 + case LOCAL_GL_RGBA16F:
1.123 + primarySize = 2*4*pixels;
1.124 + break;
1.125 + case LOCAL_GL_RGB32F:
1.126 + primarySize = 4*3*pixels;
1.127 + break;
1.128 + case LOCAL_GL_RGBA32F:
1.129 + primarySize = 4*4*pixels;
1.130 + break;
1.131 + default:
1.132 + MOZ_ASSERT(false, "Unknown `primaryFormat`.");
1.133 + break;
1.134 + }
1.135 +
1.136 + return primarySize + secondarySize;
1.137 +}
1.138 +
1.139 +void
1.140 +WebGLRenderbuffer::BindRenderbuffer() const {
1.141 + /* Do this explicitly here, since the meaning changes for depth-stencil emu.
1.142 + * Under normal circumstances, there's only one RB: `mPrimaryRB`.
1.143 + * `mSecondaryRB` is used when we have to pretend that the renderbuffer is
1.144 + * DEPTH_STENCIL, when it's actually one DEPTH buffer `mPrimaryRB` and one
1.145 + * STENCIL buffer `mSecondaryRB`.
1.146 + *
1.147 + * In the DEPTH_STENCIL emulation case, we're actually juggling two RBs, but
1.148 + * we can only bind one of them at a time. We choose to unconditionally bind
1.149 + * the depth RB. When we need to ask about the stencil buffer (say, how many
1.150 + * stencil bits we have), we temporarily bind the stencil RB, so that it
1.151 + * looks like we're just asking the question of a combined DEPTH_STENCIL
1.152 + * buffer.
1.153 + */
1.154 + mContext->gl->fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, mPrimaryRB);
1.155 +}
1.156 +
1.157 +void
1.158 +WebGLRenderbuffer::RenderbufferStorage(GLenum internalFormat, GLsizei width, GLsizei height) const {
1.159 + GLContext* gl = mContext->gl;
1.160 +
1.161 + GLenum primaryFormat = internalFormat;
1.162 + GLenum secondaryFormat = 0;
1.163 +
1.164 + if (NeedsDepthStencilEmu(mContext->gl, primaryFormat)) {
1.165 + primaryFormat = DepthStencilDepthFormat(gl);
1.166 + secondaryFormat = LOCAL_GL_STENCIL_INDEX8;
1.167 + }
1.168 +
1.169 + gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, primaryFormat, width, height);
1.170 +
1.171 + if (!mSecondaryRB) {
1.172 + MOZ_ASSERT(!secondaryFormat);
1.173 + return;
1.174 + }
1.175 + // We can't leave the secondary RB unspecified either, since we should
1.176 + // handle the case where we attach a non-depth-stencil RB to a
1.177 + // depth-stencil attachment point, or attach this depth-stencil RB to a
1.178 + // non-depth-stencil attachment point.
1.179 + ScopedBindRenderbuffer autoRB(gl, mSecondaryRB);
1.180 + if (secondaryFormat) {
1.181 + gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, secondaryFormat, width, height);
1.182 + } else {
1.183 + gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, LOCAL_GL_RGBA4, 1, 1);
1.184 + }
1.185 +}
1.186 +
1.187 +void
1.188 +WebGLRenderbuffer::FramebufferRenderbuffer(GLenum attachment) const {
1.189 + GLContext* gl = mContext->gl;
1.190 + if (attachment != LOCAL_GL_DEPTH_STENCIL_ATTACHMENT) {
1.191 + gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, attachment, LOCAL_GL_RENDERBUFFER, mPrimaryRB);
1.192 + return;
1.193 + }
1.194 +
1.195 + GLuint stencilRB = mPrimaryRB;
1.196 + if (NeedsDepthStencilEmu(mContext->gl, InternalFormatForGL())) {
1.197 + printf_stderr("DEV-ONLY: Using secondary buffer to emulate DepthStencil.\n");
1.198 + MOZ_ASSERT(mSecondaryRB);
1.199 + stencilRB = mSecondaryRB;
1.200 + }
1.201 + gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_DEPTH_ATTACHMENT, LOCAL_GL_RENDERBUFFER, mPrimaryRB);
1.202 + gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_STENCIL_ATTACHMENT, LOCAL_GL_RENDERBUFFER, stencilRB);
1.203 +}
1.204 +
1.205 +GLint
1.206 +WebGLRenderbuffer::GetRenderbufferParameter(GLenum target, GLenum pname) const {
1.207 + GLContext* gl = mContext->gl;
1.208 +
1.209 + switch (pname) {
1.210 + case LOCAL_GL_RENDERBUFFER_STENCIL_SIZE: {
1.211 + if (NeedsDepthStencilEmu(mContext->gl, InternalFormatForGL())) {
1.212 + if (gl->WorkAroundDriverBugs() &&
1.213 + gl->Renderer() == GLRenderer::Tegra)
1.214 + {
1.215 + return 8;
1.216 + }
1.217 +
1.218 + ScopedBindRenderbuffer autoRB(gl, mSecondaryRB);
1.219 +
1.220 + GLint i = 0;
1.221 + gl->fGetRenderbufferParameteriv(target, pname, &i);
1.222 + return i;
1.223 + }
1.224 + // Fall through otherwise.
1.225 + }
1.226 + case LOCAL_GL_RENDERBUFFER_WIDTH:
1.227 + case LOCAL_GL_RENDERBUFFER_HEIGHT:
1.228 + case LOCAL_GL_RENDERBUFFER_RED_SIZE:
1.229 + case LOCAL_GL_RENDERBUFFER_GREEN_SIZE:
1.230 + case LOCAL_GL_RENDERBUFFER_BLUE_SIZE:
1.231 + case LOCAL_GL_RENDERBUFFER_ALPHA_SIZE:
1.232 + case LOCAL_GL_RENDERBUFFER_DEPTH_SIZE: {
1.233 + GLint i = 0;
1.234 + gl->fGetRenderbufferParameteriv(target, pname, &i);
1.235 + return i;
1.236 + }
1.237 + }
1.238 +
1.239 + MOZ_ASSERT(false, "This function should only be called with valid `pname`.");
1.240 + return 0;
1.241 +}
1.242 +
1.243 +
1.244 +NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(WebGLRenderbuffer)
1.245 +
1.246 +NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(WebGLRenderbuffer, AddRef)
1.247 +NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(WebGLRenderbuffer, Release)
