1 files changed, 302 insertions, 0 deletions
diff --git a/dom/canvas/WebGLRenderbuffer.cpp b/dom/canvas/WebGLRenderbuffer.cpp
new file mode 100644
index 000000000..ec076fdbb
--- /dev/null
+++ b/dom/canvas/WebGLRenderbuffer.cpp
@@ -0,0 +1,302 @@
+/* -*- 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
+DepthFormatForDepthStencilEmu(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;
+}
+
+JSObject*
+WebGLRenderbuffer::WrapObject(JSContext* cx, JS::Handle<JSObject*> givenProto)
+{
+    return dom::WebGLRenderbufferBinding::Wrap(cx, this, givenProto);
+}
+
+static GLuint
+DoCreateRenderbuffer(gl::GLContext* gl)
+{
+    MOZ_ASSERT(gl->IsCurrent());
+
+    GLuint ret = 0;
+    gl->fGenRenderbuffers(1, &ret);
+    return ret;
+}
+
+static bool
+EmulatePackedDepthStencil(gl::GLContext* gl)
+{
+    return !gl->IsSupported(gl::GLFeature::packed_depth_stencil);
+}
+
+WebGLRenderbuffer::WebGLRenderbuffer(WebGLContext* webgl)
+    : WebGLRefCountedObject(webgl)
+    , mPrimaryRB( DoCreateRenderbuffer(webgl->gl) )
+    , mEmulatePackedDepthStencil( EmulatePackedDepthStencil(webgl->gl) )
+    , mSecondaryRB(0)
+    , mFormat(nullptr)
+    , mSamples(0)
+    , mImageDataStatus(WebGLImageDataStatus::NoImageData)
+    , mHasBeenBound(false)
+{
+    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
+{
+    // If there is no defined format, we're not taking up any memory
+    if (!mFormat)
+        return 0;
+
+    const auto bytesPerPixel = mFormat->format->estimatedBytesPerPixel;
+    const int64_t pixels = int64_t(mWidth) * int64_t(mHeight);
+
+    const int64_t totalSize = pixels * bytesPerPixel;
+    return totalSize;
+}
+
+static GLenum
+DoRenderbufferStorageMaybeMultisample(gl::GLContext* gl, GLsizei samples,
+                                      GLenum internalFormat, GLsizei width,
+                                      GLsizei height)
+{
+    MOZ_ASSERT_IF(samples >= 1, gl->IsSupported(gl::GLFeature::framebuffer_multisample));
+
+    // Certain OpenGL ES renderbuffer formats may not exist on desktop OpenGL.
+    switch (internalFormat) {
+    case LOCAL_GL_RGBA4:
+    case LOCAL_GL_RGB5_A1:
+        // 16-bit RGBA formats are not supported on desktop GL.
+        if (!gl->IsGLES())
+            internalFormat = LOCAL_GL_RGBA8;
+        break;
+
+    case LOCAL_GL_RGB565:
+        // RGB565 is not supported on desktop GL.
+        if (!gl->IsGLES())
+            internalFormat = LOCAL_GL_RGB8;
+        break;
+
+    case LOCAL_GL_DEPTH_COMPONENT16:
+        if (!gl->IsGLES() || gl->IsExtensionSupported(gl::GLContext::OES_depth24))
+            internalFormat = LOCAL_GL_DEPTH_COMPONENT24;
+        else if (gl->IsSupported(gl::GLFeature::packed_depth_stencil))
+            internalFormat = LOCAL_GL_DEPTH24_STENCIL8;
+        break;
+
+    case LOCAL_GL_DEPTH_STENCIL:
+        MOZ_CRASH("GFX: GL_DEPTH_STENCIL is not valid here.");
+        break;
+
+    default:
+        break;
+    }
+
+    gl::GLContext::LocalErrorScope errorScope(*gl);
+
+    if (samples > 0) {
+        gl->fRenderbufferStorageMultisample(LOCAL_GL_RENDERBUFFER, samples,
+                                            internalFormat, width, height);
+    } else {
+        gl->fRenderbufferStorage(LOCAL_GL_RENDERBUFFER, internalFormat, width, height);
+    }
+
+    return errorScope.GetError();
+}
+
+GLenum
+WebGLRenderbuffer::DoRenderbufferStorage(uint32_t samples,
+                                         const webgl::FormatUsageInfo* format,
+                                         uint32_t width, uint32_t height)
+{
+    MOZ_ASSERT(mContext->mBoundRenderbuffer == this);
+
+    gl::GLContext* gl = mContext->gl;
+    MOZ_ASSERT(samples <= 256); // Sanity check.
+
+    GLenum primaryFormat = format->format->sizedFormat;
+    GLenum secondaryFormat = 0;
+
+    if (mEmulatePackedDepthStencil && primaryFormat == LOCAL_GL_DEPTH24_STENCIL8) {
+        primaryFormat = DepthFormatForDepthStencilEmu(gl);
+        secondaryFormat = LOCAL_GL_STENCIL_INDEX8;
+    }
+
+    gl->fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, mPrimaryRB);
+    GLenum error = DoRenderbufferStorageMaybeMultisample(gl, samples, primaryFormat,
+                                                         width, height);
+    if (error)
+        return error;
+
+    if (secondaryFormat) {
+        if (!mSecondaryRB) {
+            gl->fGenRenderbuffers(1, &mSecondaryRB);
+        }
+
+        gl->fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, mSecondaryRB);
+        error = DoRenderbufferStorageMaybeMultisample(gl, samples, secondaryFormat,
+                                                      width, height);
+        if (error)
+            return error;
+    } else if (mSecondaryRB) {
+        gl->fDeleteRenderbuffers(1, &mSecondaryRB);
+        mSecondaryRB = 0;
+    }
+
+    return 0;
+}
+
+void
+WebGLRenderbuffer::RenderbufferStorage(const char* funcName, uint32_t samples,
+                                       GLenum internalFormat, uint32_t width,
+                                       uint32_t height)
+{
+    const auto usage = mContext->mFormatUsage->GetRBUsage(internalFormat);
+    if (!usage) {
+        mContext->ErrorInvalidEnum("%s: Invalid `internalFormat`: 0x%04x.", funcName,
+                                   internalFormat);
+        return;
+    }
+
+    if (width > mContext->mImplMaxRenderbufferSize ||
+        height > mContext->mImplMaxRenderbufferSize)
+    {
+        mContext->ErrorInvalidValue("%s: Width or height exceeds maximum renderbuffer"
+                                    " size.",
+                                    funcName);
+        return;
+    }
+
+    mContext->MakeContextCurrent();
+
+    if (!usage->maxSamplesKnown) {
+        const_cast<webgl::FormatUsageInfo*>(usage)->ResolveMaxSamples(mContext->gl);
+    }
+    MOZ_ASSERT(usage->maxSamplesKnown);
+
+    if (samples > usage->maxSamples) {
+        mContext->ErrorInvalidOperation("%s: `samples` is out of the valid range.", funcName);
+        return;
+    }
+
+    // Validation complete.
+
+    const GLenum error = DoRenderbufferStorage(samples, usage, width, height);
+    if (error) {
+        const char* errorName = mContext->ErrorName(error);
+        mContext->GenerateWarning("%s generated error %s", funcName, errorName);
+        return;
+    }
+
+    mSamples = samples;
+    mFormat = usage;
+    mWidth = width;
+    mHeight = height;
+    mImageDataStatus = WebGLImageDataStatus::UninitializedImageData;
+
+    InvalidateStatusOfAttachedFBs();
+}
+
+void
+WebGLRenderbuffer::DoFramebufferRenderbuffer(FBTarget target, GLenum attachment) const
+{
+    gl::GLContext* gl = mContext->gl;
+
+    if (attachment == LOCAL_GL_DEPTH_STENCIL_ATTACHMENT) {
+        const GLuint stencilRB = (mSecondaryRB ? mSecondaryRB : mPrimaryRB);
+        gl->fFramebufferRenderbuffer(target.get(), LOCAL_GL_DEPTH_ATTACHMENT,
+                                     LOCAL_GL_RENDERBUFFER, mPrimaryRB);
+        gl->fFramebufferRenderbuffer(target.get(), LOCAL_GL_STENCIL_ATTACHMENT,
+                                     LOCAL_GL_RENDERBUFFER, stencilRB);
+        return;
+    }
+
+    gl->fFramebufferRenderbuffer(target.get(), attachment,
+                                 LOCAL_GL_RENDERBUFFER, mPrimaryRB);
+}
+
+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->s)
+            return 0;
+
+        return 8;
+
+    case LOCAL_GL_RENDERBUFFER_SAMPLES:
+    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:
+        {
+            gl->fBindRenderbuffer(LOCAL_GL_RENDERBUFFER, mPrimaryRB);
+            GLint i = 0;
+            gl->fGetRenderbufferParameteriv(target.get(), pname.get(), &i);
+            return i;
+        }
+
+    case LOCAL_GL_RENDERBUFFER_INTERNAL_FORMAT:
+        {
+            GLenum ret = LOCAL_GL_RGBA4;
+            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