1 files changed, 72 insertions, 0 deletions
diff --git a/dom/canvas/WebGLExtensionSRGB.cpp b/dom/canvas/WebGLExtensionSRGB.cpp
new file mode 100644
index 000000000..18c944e1b
--- /dev/null
+++ b/dom/canvas/WebGLExtensionSRGB.cpp
@@ -0,0 +1,72 @@
+/* -*- 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 "WebGLExtensions.h"
+
+#include "GLContext.h"
+#include "mozilla/dom/WebGLRenderingContextBinding.h"
+#include "WebGLContext.h"
+#include "WebGLFormats.h"
+
+namespace mozilla {
+
+WebGLExtensionSRGB::WebGLExtensionSRGB(WebGLContext* webgl)
+    : WebGLExtensionBase(webgl)
+{
+    MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");
+
+    gl::GLContext* gl = webgl->GL();
+    if (!gl->IsGLES()) {
+        // Desktop OpenGL requires the following to be enabled in order to
+        // support sRGB operations on framebuffers.
+        gl->MakeCurrent();
+        gl->fEnable(LOCAL_GL_FRAMEBUFFER_SRGB_EXT);
+    }
+
+    auto& fua = webgl->mFormatUsage;
+
+    RefPtr<gl::GLContext> gl_ = gl; // Bug 1201275
+    const auto fnAdd = [&fua, &gl_](webgl::EffectiveFormat effFormat, GLenum format,
+                                    GLenum desktopUnpackFormat)
+    {
+        auto usage = fua->EditUsage(effFormat);
+        usage->isFilterable = true;
+
+        webgl::DriverUnpackInfo dui = {format, format, LOCAL_GL_UNSIGNED_BYTE};
+        const auto pi = dui.ToPacking();
+
+        if (!gl_->IsGLES())
+            dui.unpackFormat = desktopUnpackFormat;
+
+        fua->AddTexUnpack(usage, pi, dui);
+
+        fua->AllowUnsizedTexFormat(pi, usage);
+    };
+
+    fnAdd(webgl::EffectiveFormat::SRGB8, LOCAL_GL_SRGB, LOCAL_GL_RGB);
+    fnAdd(webgl::EffectiveFormat::SRGB8_ALPHA8, LOCAL_GL_SRGB_ALPHA, LOCAL_GL_RGBA);
+
+    auto usage = fua->EditUsage(webgl::EffectiveFormat::SRGB8_ALPHA8);
+    usage->SetRenderable();
+    fua->AllowRBFormat(LOCAL_GL_SRGB8_ALPHA8, usage);
+}
+
+WebGLExtensionSRGB::~WebGLExtensionSRGB()
+{
+}
+
+bool
+WebGLExtensionSRGB::IsSupported(const WebGLContext* webgl)
+{
+    gl::GLContext* gl = webgl->GL();
+
+    return gl->IsSupported(gl::GLFeature::sRGB_framebuffer) &&
+           gl->IsSupported(gl::GLFeature::sRGB_texture);
+}
+
+
+IMPL_WEBGL_EXTENSION_GOOP(WebGLExtensionSRGB, EXT_sRGB)
+
+} // namespace mozilla