gecko-dev/content/canvas/src/WebGLRenderbuffer.cpp

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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "WebGLContext.h"
#include "WebGLRenderbuffer.h"
#include "WebGLTexture.h"
#include "mozilla/dom/WebGLRenderingContextBinding.h"
#include "GLContext.h"
#include "ScopedGLHelpers.h"
using namespace mozilla;
using namespace mozilla::gl;
static GLenum
DepthStencilDepthFormat(GLContext* gl) {
// We might not be able to get 24-bit, so let's pretend!
if (gl->IsGLES2() && !gl->IsExtensionSupported(gl::GLContext::OES_depth24))
return LOCAL_GL_DEPTH_COMPONENT16;
return LOCAL_GL_DEPTH_COMPONENT24;
}
static bool
SupportsDepthStencil(GLContext* gl) {
return gl->IsExtensionSupported(GLContext::EXT_packed_depth_stencil) ||
gl->IsExtensionSupported(GLContext::OES_packed_depth_stencil);
}
static bool
NeedsDepthStencilEmu(GLContext* gl, GLenum internalFormat) {
MOZ_ASSERT(internalFormat != LOCAL_GL_DEPTH_STENCIL);
if (internalFormat != LOCAL_GL_DEPTH24_STENCIL8)
return false;
return !SupportsDepthStencil(gl);
}
JSObject*
WebGLRenderbuffer::WrapObject(JSContext *cx, JS::Handle<JSObject*> scope) {
return dom::WebGLRenderbufferBinding::Wrap(cx, scope, this);
}
WebGLRenderbuffer::WebGLRenderbuffer(WebGLContext *context)
: WebGLContextBoundObject(context)
, mPrimaryRB(0)
, mSecondaryRB(0)
, mInternalFormat(0)
, mInternalFormatForGL(0)
, mHasEverBeenBound(false)
, mImageDataStatus(WebGLImageDataStatus::NoImageData)
{
SetIsDOMBinding();
mContext->MakeContextCurrent();
mContext->gl->fGenRenderbuffers(1, &mPrimaryRB);
if (!SupportsDepthStencil(mContext->gl))
mContext->gl->fGenRenderbuffers(1, &mSecondaryRB);
mContext->mRenderbuffers.insertBack(this);
}
void
WebGLRenderbuffer::Delete() {
mContext->MakeContextCurrent();
mContext->gl->fDeleteRenderbuffers(1, &mPrimaryRB);
if (mSecondaryRB)
mContext->gl->fDeleteRenderbuffers(1, &mSecondaryRB);
LinkedListElement<WebGLRenderbuffer>::removeFrom(mContext->mRenderbuffers);
}
int64_t
WebGLRenderbuffer::MemoryUsage() const {
int64_t pixels = int64_t(Width()) * int64_t(Height());
GLenum primaryFormat = InternalFormatForGL();
// If there is no defined format, we're not taking up any memory
if (!primaryFormat) {
return 0;
}
int64_t secondarySize = 0;
if (mSecondaryRB) {
if (NeedsDepthStencilEmu(mContext->gl, primaryFormat)) {
primaryFormat = DepthStencilDepthFormat(mContext->gl);
secondarySize = 1*pixels; // STENCIL_INDEX8
} else {
secondarySize = 1*1*2; // 1x1xRGBA4
}
}
int64_t primarySize = 0;
switch (primaryFormat) {
case LOCAL_GL_STENCIL_INDEX8:
primarySize = 1 * pixels;
break;
case LOCAL_GL_RGBA4:
case LOCAL_GL_RGB5_A1:
case LOCAL_GL_RGB565:
case LOCAL_GL_DEPTH_COMPONENT16:
primarySize = 2 * pixels;
break;
case LOCAL_GL_RGB8:
case LOCAL_GL_DEPTH_COMPONENT24:
primarySize = 3*pixels;
break;
case LOCAL_GL_RGBA8:
case LOCAL_GL_SRGB8_ALPHA8_EXT:
case LOCAL_GL_DEPTH24_STENCIL8:
case LOCAL_GL_DEPTH_COMPONENT32:
primarySize = 4*pixels;
break;
default:
MOZ_ASSERT(false, "Unknown `primaryFormat`.");
break;
}
return primarySize + secondarySize;
}
void
WebGLRenderbuffer::BindRenderbuffer() const {
/* Do this explicitly here, since the meaning changes for depth-stencil emu.
* Under normal circumstances, there's only one RB: `mPrimaryRB`.
* `mSecondaryRB` is used when we have to pretend that the renderbuffer is
* DEPTH_STENCIL, when it's actually one DEPTH buffer `mPrimaryRB` and one
* STENCIL buffer `mSecondaryRB`.
*
* In the DEPTH_STENCIL emulation case, we're actually juggling two RBs, but
* we can only bind one of them at a time. We choose to unconditionally bind
* the depth RB. When we need to ask about the stencil buffer (say, how many
* stencil bits we have), we temporarily bind the stencil RB, so that it
* looks like we're just asking the question of a combined DEPTH_STENCIL
* buffer.
*/
mContext->gl->fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, mPrimaryRB);
}
void
WebGLRenderbuffer::RenderbufferStorage(GLenum internalFormat, GLsizei width, GLsizei height) const {
GLContext* gl = mContext->gl;
GLenum primaryFormat = internalFormat;
GLenum secondaryFormat = 0;
if (NeedsDepthStencilEmu(mContext->gl, primaryFormat)) {
primaryFormat = DepthStencilDepthFormat(gl);
secondaryFormat = LOCAL_GL_STENCIL_INDEX8;
}
gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, primaryFormat, width, height);
if (!mSecondaryRB) {
MOZ_ASSERT(!secondaryFormat);
return;
}
// We can't leave the secondary RB unspecified either, since we should
// handle the case where we attach a non-depth-stencil RB to a
// depth-stencil attachment point, or attach this depth-stencil RB to a
// non-depth-stencil attachment point.
ScopedBindRenderbuffer autoRB(gl, mSecondaryRB);
if (secondaryFormat) {
gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, secondaryFormat, width, height);
} else {
gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, LOCAL_GL_RGBA4, 1, 1);
}
}
void
WebGLRenderbuffer::FramebufferRenderbuffer(GLenum attachment) const {
GLContext* gl = mContext->gl;
if (attachment != LOCAL_GL_DEPTH_STENCIL_ATTACHMENT) {
gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, attachment, LOCAL_GL_RENDERBUFFER, mPrimaryRB);
return;
}
GLuint stencilRB = mPrimaryRB;
if (NeedsDepthStencilEmu(mContext->gl, InternalFormatForGL())) {
printf_stderr("DEV-ONLY: Using secondary buffer to emulate DepthStencil.\n");
MOZ_ASSERT(mSecondaryRB);
stencilRB = mSecondaryRB;
}
gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_DEPTH_ATTACHMENT, LOCAL_GL_RENDERBUFFER, mPrimaryRB);
gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_STENCIL_ATTACHMENT, LOCAL_GL_RENDERBUFFER, stencilRB);
}
GLint
WebGLRenderbuffer::GetRenderbufferParameter(GLenum target, GLenum pname) const {
GLContext* gl = mContext->gl;
switch (pname) {
case LOCAL_GL_RENDERBUFFER_STENCIL_SIZE: {
if (NeedsDepthStencilEmu(mContext->gl, InternalFormatForGL())) {
if (gl->WorkAroundDriverBugs() &&
gl->Renderer() == GLRenderer::Tegra)
{
return 8;
}
ScopedBindRenderbuffer autoRB(gl, mSecondaryRB);
GLint i = 0;
gl->fGetRenderbufferParameteriv(target, pname, &i);
return i;
}
// Fall through otherwise.
}
case LOCAL_GL_RENDERBUFFER_WIDTH:
case LOCAL_GL_RENDERBUFFER_HEIGHT:
case LOCAL_GL_RENDERBUFFER_RED_SIZE:
case LOCAL_GL_RENDERBUFFER_GREEN_SIZE:
case LOCAL_GL_RENDERBUFFER_BLUE_SIZE:
case LOCAL_GL_RENDERBUFFER_ALPHA_SIZE:
case LOCAL_GL_RENDERBUFFER_DEPTH_SIZE: {
GLint i = 0;
gl->fGetRenderbufferParameteriv(target, pname, &i);
return i;
}
}
MOZ_ASSERT(false, "This function should only be called with valid `pname`.");
return 0;
}
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(WebGLRenderbuffer)
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(WebGLRenderbuffer, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(WebGLRenderbuffer, Release)