1 files changed, 57 insertions, 0 deletions
diff --git a/dom/canvas/WebGLExtensionColorBufferHalfFloat.cpp b/dom/canvas/WebGLExtensionColorBufferHalfFloat.cpp
new file mode 100644
index 0000000000..fea29d3e27
--- /dev/null
+++ b/dom/canvas/WebGLExtensionColorBufferHalfFloat.cpp
@@ -0,0 +1,57 @@
+/* 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 {
+
+WebGLExtensionColorBufferHalfFloat::WebGLExtensionColorBufferHalfFloat(
+    WebGLContext* webgl)
+    : WebGLExtensionBase(webgl) {
+  MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");
+  SetRenderable(webgl::FormatRenderableState::Implicit(
+      WebGLExtensionID::EXT_color_buffer_half_float));
+}
+
+void WebGLExtensionColorBufferHalfFloat::SetRenderable(
+    const webgl::FormatRenderableState state) {
+  auto& fua = mContext->mFormatUsage;
+
+  auto fnUpdateUsage = [&](GLenum sizedFormat, webgl::EffectiveFormat effFormat,
+                           const bool renderable) {
+    auto usage = fua->EditUsage(effFormat);
+    if (renderable) {
+      usage->SetRenderable(state);
+    }
+    fua->AllowRBFormat(sizedFormat, usage, renderable);
+  };
+
+#define FOO(x, y) fnUpdateUsage(LOCAL_GL_##x, webgl::EffectiveFormat::x, y)
+
+  FOO(RGBA16F, true);
+  FOO(RGB16F, false);  // It's not required, thus not portable. (Also there's a
+                       // wicked driver bug on Mac+Intel)
+
+#undef FOO
+}
+
+void WebGLExtensionColorBufferHalfFloat::OnSetExplicit() {
+  SetRenderable(webgl::FormatRenderableState::Explicit());
+}
+
+bool WebGLExtensionColorBufferHalfFloat::IsSupported(
+    const WebGLContext* webgl) {
+  if (webgl->IsWebGL2()) return false;
+
+  const auto& gl = webgl->gl;
+  return gl->IsSupported(gl::GLFeature::renderbuffer_color_half_float) &&
+         gl->IsSupported(gl::GLFeature::frag_color_float);
+}
+
+}  // namespace mozilla