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tenfourfox/dom/canvas/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 "WebGLRenderbuffer.h"
#include "GLContext.h"
#include "mozilla/dom/WebGLRenderingContextBinding.h"
#include "ScopedGLHelpers.h"
#include "WebGLContext.h"
#include "WebGLStrongTypes.h"
#include "WebGLTexture.h"
namespace mozilla {
static GLenum
DepthStencilDepthFormat(gl::GLContext* gl)
{
// We might not be able to get 24-bit, so let's pretend!
if (gl->IsGLES() && !gl->IsExtensionSupported(gl::GLContext::OES_depth24))
return LOCAL_GL_DEPTH_COMPONENT16;
return LOCAL_GL_DEPTH_COMPONENT24;
}
static bool
SupportsDepthStencil(gl::GLContext* gl)
{
return gl->IsExtensionSupported(gl::GLContext::EXT_packed_depth_stencil) ||
gl->IsExtensionSupported(gl::GLContext::OES_packed_depth_stencil);
}
static bool
NeedsDepthStencilEmu(gl::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*> givenProto)
{
return dom::WebGLRenderbufferBinding::Wrap(cx, this, givenProto);
}
WebGLRenderbuffer::WebGLRenderbuffer(WebGLContext* webgl)
: WebGLContextBoundObject(webgl)
, mPrimaryRB(0)
, mSecondaryRB(0)
, mFormat(nullptr)
, mImageDataStatus(WebGLImageDataStatus::NoImageData)
, mSamples(1)
, mIsUsingSecondary(false)
#ifdef ANDROID
, mIsRB(false)
#endif
{
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);
#ifdef ANDROID
mIsRB = false;
#endif
}
int64_t
WebGLRenderbuffer::MemoryUsage() const
{
// If there is no defined format, we're not taking up any memory
if (!mFormat)
return 0;
auto bytesPerPixel = mFormat->format->estimatedBytesPerPixel;
uint64_t pixels = uint64_t(mWidth) * uint64_t(mHeight);
uint64_t totalSize = pixels * bytesPerPixel;
// If we have the same bytesPerPixel whether or not we have a secondary RB.
if (mSecondaryRB && !mIsUsingSecondary) {
totalSize += 2; // 1x1xRGBA4
}
return int64_t(totalSize);
}
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);
}
static void
RenderbufferStorageMaybeMultisample(gl::GLContext* gl, GLsizei samples,
GLenum internalFormat, GLsizei width,
GLsizei height)
{
MOZ_ASSERT_IF(samples >= 1, gl->IsSupported(gl::GLFeature::framebuffer_multisample));
MOZ_ASSERT(samples >= 0);
MOZ_ASSERT(samples <= gl->MaxSamples());
// certain OpenGL ES renderbuffer formats may not exist on desktop OpenGL
GLenum internalFormatForGL = internalFormat;
switch (internalFormat) {
case LOCAL_GL_RGBA4:
case LOCAL_GL_RGB5_A1:
// 16-bit RGBA formats are not supported on desktop GL
if (!gl->IsGLES())
internalFormatForGL = LOCAL_GL_RGBA8;
break;
case LOCAL_GL_RGB565:
// the RGB565 format is not supported on desktop GL
if (!gl->IsGLES())
internalFormatForGL = LOCAL_GL_RGB8;
break;
case LOCAL_GL_DEPTH_COMPONENT16:
if (!gl->IsGLES() || gl->IsExtensionSupported(gl::GLContext::OES_depth24))
internalFormatForGL = LOCAL_GL_DEPTH_COMPONENT24;
else if (gl->IsExtensionSupported(gl::GLContext::OES_packed_depth_stencil))
internalFormatForGL = LOCAL_GL_DEPTH24_STENCIL8;
break;
case LOCAL_GL_DEPTH_STENCIL:
// We emulate this in WebGLRenderbuffer if we don't have the requisite extension.
internalFormatForGL = LOCAL_GL_DEPTH24_STENCIL8;
break;
default:
break;
}
if (samples > 0) {
gl->fRenderbufferStorageMultisample(LOCAL_GL_RENDERBUFFER, samples,
internalFormatForGL, width, height);
} else {
gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, internalFormatForGL, width,
height);
}
}
void
WebGLRenderbuffer::RenderbufferStorage(GLsizei samples,
const webgl::FormatUsageInfo* format,
GLsizei width, GLsizei height)
{
MOZ_ASSERT(mContext->mBoundRenderbuffer == this);
gl::GLContext* gl = mContext->gl;
MOZ_ASSERT(samples >= 0 && samples <= 256); // Sanity check.
GLenum primaryFormat = format->format->sizedFormat;
GLenum secondaryFormat = 0;
if (NeedsDepthStencilEmu(mContext->gl, primaryFormat)) {
primaryFormat = DepthStencilDepthFormat(gl);
secondaryFormat = LOCAL_GL_STENCIL_INDEX8;
}
RenderbufferStorageMaybeMultisample(gl, samples, primaryFormat, width,
height);
if (mSecondaryRB) {
// 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.
gl::ScopedBindRenderbuffer autoRB(gl, mSecondaryRB);
if (secondaryFormat) {
RenderbufferStorageMaybeMultisample(gl, samples, secondaryFormat, width,
height);
} else {
RenderbufferStorageMaybeMultisample(gl, samples, LOCAL_GL_RGBA4, 1, 1);
}
}
mSamples = samples;
mFormat = format;
mWidth = width;
mHeight = height;
mImageDataStatus = WebGLImageDataStatus::UninitializedImageData;
mIsUsingSecondary = bool(secondaryFormat);
InvalidateStatusOfAttachedFBs();
}
void
WebGLRenderbuffer::FramebufferRenderbuffer(GLenum attachment) const
{
gl::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 (mIsUsingSecondary) {
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(RBTarget target,
RBParam pname) const
{
gl::GLContext* gl = mContext->gl;
switch (pname.get()) {
case LOCAL_GL_RENDERBUFFER_STENCIL_SIZE:
if (!mFormat)
return 0;
if (!mFormat->format->hasStencil)
return 0;
return 8;
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.get(), pname.get(), &i);
return i;
}
case LOCAL_GL_RENDERBUFFER_INTERNAL_FORMAT:
{
GLenum ret = 0;
if (mFormat) {
ret = mFormat->format->sizedFormat;
if (!mContext->IsWebGL2() && ret == LOCAL_GL_DEPTH24_STENCIL8) {
ret = LOCAL_GL_DEPTH_STENCIL;
}
}
return ret;
}
}
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)
} // namespace mozilla
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