1 files changed, 59 insertions, 0 deletions
diff --git a/dom/canvas/WebGLExtensionSRGB.cpp b/dom/canvas/WebGLExtensionSRGB.cpp
new file mode 100644
index 0000000000..3bdd73294b
--- /dev/null
+++ b/dom/canvas/WebGLExtensionSRGB.cpp
@@ -0,0 +1,59 @@
+/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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->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);
+}
+
+bool WebGLExtensionSRGB::IsSupported(const WebGLContext* const webgl) {
+  if (webgl->IsWebGL2()) return false;
+
+  return webgl->gl->IsSupported(gl::GLFeature::sRGB);
+}
+
+}  // namespace mozilla