michael@0: /* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #include "WebGLContext.h"
michael@0: #include "WebGLRenderbuffer.h"
michael@0: #include "WebGLTexture.h"
michael@0: #include "mozilla/dom/WebGLRenderingContextBinding.h"
michael@0: #include "GLContext.h"
michael@0: #include "ScopedGLHelpers.h"
michael@0: 
michael@0: using namespace mozilla;
michael@0: using namespace mozilla::gl;
michael@0: 
michael@0: static GLenum
michael@0: DepthStencilDepthFormat(GLContext* gl) {
michael@0:     // We might not be able to get 24-bit, so let's pretend!
michael@0:     if (gl->IsGLES() && !gl->IsExtensionSupported(gl::GLContext::OES_depth24))
michael@0:         return LOCAL_GL_DEPTH_COMPONENT16;
michael@0: 
michael@0:     return LOCAL_GL_DEPTH_COMPONENT24;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: SupportsDepthStencil(GLContext* gl) {
michael@0:     return gl->IsExtensionSupported(GLContext::EXT_packed_depth_stencil) ||
michael@0:            gl->IsExtensionSupported(GLContext::OES_packed_depth_stencil);
michael@0: }
michael@0: 
michael@0: static bool
michael@0: NeedsDepthStencilEmu(GLContext* gl, GLenum internalFormat) {
michael@0:     MOZ_ASSERT(internalFormat != LOCAL_GL_DEPTH_STENCIL);
michael@0:     if (internalFormat != LOCAL_GL_DEPTH24_STENCIL8)
michael@0:         return false;
michael@0: 
michael@0:     return !SupportsDepthStencil(gl);
michael@0: }
michael@0: 
michael@0: JSObject*
michael@0: WebGLRenderbuffer::WrapObject(JSContext *cx) {
michael@0:     return dom::WebGLRenderbufferBinding::Wrap(cx, this);
michael@0: }
michael@0: 
michael@0: WebGLRenderbuffer::WebGLRenderbuffer(WebGLContext *context)
michael@0:     : WebGLContextBoundObject(context)
michael@0:     , mPrimaryRB(0)
michael@0:     , mSecondaryRB(0)
michael@0:     , mInternalFormat(0)
michael@0:     , mInternalFormatForGL(0)
michael@0:     , mHasEverBeenBound(false)
michael@0:     , mImageDataStatus(WebGLImageDataStatus::NoImageData)
michael@0: {
michael@0:     SetIsDOMBinding();
michael@0:     mContext->MakeContextCurrent();
michael@0: 
michael@0:     mContext->gl->fGenRenderbuffers(1, &mPrimaryRB);
michael@0:     if (!SupportsDepthStencil(mContext->gl))
michael@0:         mContext->gl->fGenRenderbuffers(1, &mSecondaryRB);
michael@0: 
michael@0:     mContext->mRenderbuffers.insertBack(this);
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLRenderbuffer::Delete() {
michael@0:     mContext->MakeContextCurrent();
michael@0: 
michael@0:     mContext->gl->fDeleteRenderbuffers(1, &mPrimaryRB);
michael@0:     if (mSecondaryRB)
michael@0:         mContext->gl->fDeleteRenderbuffers(1, &mSecondaryRB);
michael@0: 
michael@0:     LinkedListElement<WebGLRenderbuffer>::removeFrom(mContext->mRenderbuffers);
michael@0: }
michael@0: 
michael@0: int64_t
michael@0: WebGLRenderbuffer::MemoryUsage() const {
michael@0:     int64_t pixels = int64_t(Width()) * int64_t(Height());
michael@0: 
michael@0:     GLenum primaryFormat = InternalFormatForGL();
michael@0:     // If there is no defined format, we're not taking up any memory
michael@0:     if (!primaryFormat) {
michael@0:         return 0;
michael@0:     }
michael@0: 
michael@0:     int64_t secondarySize = 0;
michael@0:     if (mSecondaryRB) {
michael@0:         if (NeedsDepthStencilEmu(mContext->gl, primaryFormat)) {
michael@0:             primaryFormat = DepthStencilDepthFormat(mContext->gl);
michael@0:             secondarySize = 1*pixels; // STENCIL_INDEX8
michael@0:         } else {
michael@0:             secondarySize = 1*1*2; // 1x1xRGBA4
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     int64_t primarySize = 0;
michael@0:     switch (primaryFormat) {
michael@0:         case LOCAL_GL_STENCIL_INDEX8:
michael@0:             primarySize = 1*pixels;
michael@0:             break;
michael@0:         case LOCAL_GL_RGBA4:
michael@0:         case LOCAL_GL_RGB5_A1:
michael@0:         case LOCAL_GL_RGB565:
michael@0:         case LOCAL_GL_DEPTH_COMPONENT16:
michael@0:             primarySize = 2*pixels;
michael@0:             break;
michael@0:         case LOCAL_GL_RGB8:
michael@0:         case LOCAL_GL_DEPTH_COMPONENT24:
michael@0:             primarySize = 3*pixels;
michael@0:             break;
michael@0:         case LOCAL_GL_RGBA8:
michael@0:         case LOCAL_GL_SRGB8_ALPHA8_EXT:
michael@0:         case LOCAL_GL_DEPTH24_STENCIL8:
michael@0:         case LOCAL_GL_DEPTH_COMPONENT32:
michael@0:             primarySize = 4*pixels;
michael@0:             break;
michael@0:         case LOCAL_GL_RGB16F:
michael@0:             primarySize = 2*3*pixels;
michael@0:             break;
michael@0:         case LOCAL_GL_RGBA16F:
michael@0:             primarySize = 2*4*pixels;
michael@0:             break;
michael@0:         case LOCAL_GL_RGB32F:
michael@0:             primarySize = 4*3*pixels;
michael@0:             break;
michael@0:         case LOCAL_GL_RGBA32F:
michael@0:             primarySize = 4*4*pixels;
michael@0:             break;
michael@0:         default:
michael@0:             MOZ_ASSERT(false, "Unknown `primaryFormat`.");
michael@0:             break;
michael@0:     }
michael@0: 
michael@0:     return primarySize + secondarySize;
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLRenderbuffer::BindRenderbuffer() const {
michael@0:     /* Do this explicitly here, since the meaning changes for depth-stencil emu.
michael@0:      * Under normal circumstances, there's only one RB: `mPrimaryRB`.
michael@0:      * `mSecondaryRB` is used when we have to pretend that the renderbuffer is
michael@0:      * DEPTH_STENCIL, when it's actually one DEPTH buffer `mPrimaryRB` and one
michael@0:      * STENCIL buffer `mSecondaryRB`.
michael@0:      *
michael@0:      * In the DEPTH_STENCIL emulation case, we're actually juggling two RBs, but
michael@0:      * we can only bind one of them at a time. We choose to unconditionally bind
michael@0:      * the depth RB. When we need to ask about the stencil buffer (say, how many
michael@0:      * stencil bits we have), we temporarily bind the stencil RB, so that it
michael@0:      * looks like we're just asking the question of a combined DEPTH_STENCIL
michael@0:      * buffer.
michael@0:      */
michael@0:     mContext->gl->fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, mPrimaryRB);
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLRenderbuffer::RenderbufferStorage(GLenum internalFormat, GLsizei width, GLsizei height) const {
michael@0:     GLContext* gl = mContext->gl;
michael@0: 
michael@0:     GLenum primaryFormat = internalFormat;
michael@0:     GLenum secondaryFormat = 0;
michael@0: 
michael@0:     if (NeedsDepthStencilEmu(mContext->gl, primaryFormat)) {
michael@0:         primaryFormat = DepthStencilDepthFormat(gl);
michael@0:         secondaryFormat = LOCAL_GL_STENCIL_INDEX8;
michael@0:     }
michael@0: 
michael@0:     gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, primaryFormat, width, height);
michael@0: 
michael@0:     if (!mSecondaryRB) {
michael@0:         MOZ_ASSERT(!secondaryFormat);
michael@0:         return;
michael@0:     }
michael@0:     // We can't leave the secondary RB unspecified either, since we should
michael@0:     // handle the case where we attach a non-depth-stencil RB to a
michael@0:     // depth-stencil attachment point, or attach this depth-stencil RB to a
michael@0:     // non-depth-stencil attachment point.
michael@0:     ScopedBindRenderbuffer autoRB(gl, mSecondaryRB);
michael@0:     if (secondaryFormat) {
michael@0:         gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, secondaryFormat, width, height);
michael@0:     } else {
michael@0:         gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, LOCAL_GL_RGBA4, 1, 1);
michael@0:     }
michael@0: }
michael@0: 
michael@0: void
michael@0: WebGLRenderbuffer::FramebufferRenderbuffer(GLenum attachment) const {
michael@0:     GLContext* gl = mContext->gl;
michael@0:     if (attachment != LOCAL_GL_DEPTH_STENCIL_ATTACHMENT) {
michael@0:         gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, attachment, LOCAL_GL_RENDERBUFFER, mPrimaryRB);
michael@0:         return;
michael@0:     }
michael@0: 
michael@0:     GLuint stencilRB = mPrimaryRB;
michael@0:     if (NeedsDepthStencilEmu(mContext->gl, InternalFormatForGL())) {
michael@0:         printf_stderr("DEV-ONLY: Using secondary buffer to emulate DepthStencil.\n");
michael@0:         MOZ_ASSERT(mSecondaryRB);
michael@0:         stencilRB = mSecondaryRB;
michael@0:     }
michael@0:     gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_DEPTH_ATTACHMENT,   LOCAL_GL_RENDERBUFFER, mPrimaryRB);
michael@0:     gl->fFramebufferRenderbuffer(LOCAL_GL_FRAMEBUFFER, LOCAL_GL_STENCIL_ATTACHMENT, LOCAL_GL_RENDERBUFFER, stencilRB);
michael@0: }
michael@0: 
michael@0: GLint
michael@0: WebGLRenderbuffer::GetRenderbufferParameter(GLenum target, GLenum pname) const {
michael@0:     GLContext* gl = mContext->gl;
michael@0: 
michael@0:     switch (pname) {
michael@0:         case LOCAL_GL_RENDERBUFFER_STENCIL_SIZE: {
michael@0:             if (NeedsDepthStencilEmu(mContext->gl, InternalFormatForGL())) {
michael@0:                 if (gl->WorkAroundDriverBugs() &&
michael@0:                     gl->Renderer() == GLRenderer::Tegra)
michael@0:                 {
michael@0:                     return 8;
michael@0:                 }
michael@0: 
michael@0:                 ScopedBindRenderbuffer autoRB(gl, mSecondaryRB);
michael@0: 
michael@0:                 GLint i = 0;
michael@0:                 gl->fGetRenderbufferParameteriv(target, pname, &i);
michael@0:                 return i;
michael@0:             }
michael@0:             // Fall through otherwise.
michael@0:         }
michael@0:         case LOCAL_GL_RENDERBUFFER_WIDTH:
michael@0:         case LOCAL_GL_RENDERBUFFER_HEIGHT:
michael@0:         case LOCAL_GL_RENDERBUFFER_RED_SIZE:
michael@0:         case LOCAL_GL_RENDERBUFFER_GREEN_SIZE:
michael@0:         case LOCAL_GL_RENDERBUFFER_BLUE_SIZE:
michael@0:         case LOCAL_GL_RENDERBUFFER_ALPHA_SIZE:
michael@0:         case LOCAL_GL_RENDERBUFFER_DEPTH_SIZE: {
michael@0:             GLint i = 0;
michael@0:             gl->fGetRenderbufferParameteriv(target, pname, &i);
michael@0:             return i;
michael@0:         }
michael@0:     }
michael@0: 
michael@0:     MOZ_ASSERT(false, "This function should only be called with valid `pname`.");
michael@0:     return 0;
michael@0: }
michael@0: 
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_0(WebGLRenderbuffer)
michael@0: 
michael@0: NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(WebGLRenderbuffer, AddRef)
michael@0: NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(WebGLRenderbuffer, Release)