1 files changed, 53 insertions, 0 deletions
diff --git a/dom/canvas/WebGLExtensionColorBufferFloat.cpp b/dom/canvas/WebGLExtensionColorBufferFloat.cpp
new file mode 100644
index 0000000000..9249935f58
--- /dev/null
+++ b/dom/canvas/WebGLExtensionColorBufferFloat.cpp
@@ -0,0 +1,53 @@
+/* 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 {
+
+WebGLExtensionColorBufferFloat::WebGLExtensionColorBufferFloat(
+    WebGLContext* webgl)
+    : WebGLExtensionBase(webgl) {
+  MOZ_ASSERT(IsSupported(webgl), "Don't construct extension if unsupported.");
+  SetRenderable(webgl::FormatRenderableState::Implicit(
+      WebGLExtensionID::WEBGL_color_buffer_float));
+}
+
+void WebGLExtensionColorBufferFloat::SetRenderable(
+    const webgl::FormatRenderableState state) {
+  auto& fua = mContext->mFormatUsage;
+
+  auto fnUpdateUsage = [&](GLenum sizedFormat,
+                           webgl::EffectiveFormat effFormat) {
+    auto usage = fua->EditUsage(effFormat);
+    usage->SetRenderable(state);
+    fua->AllowRBFormat(sizedFormat, usage);
+  };
+
+#define FOO(x) fnUpdateUsage(LOCAL_GL_##x, webgl::EffectiveFormat::x)
+
+  // The extension doesn't actually add RGB32F; only RGBA32F.
+  FOO(RGBA32F);
+
+#undef FOO
+}
+
+void WebGLExtensionColorBufferFloat::OnSetExplicit() {
+  SetRenderable(webgl::FormatRenderableState::Explicit());
+}
+
+bool WebGLExtensionColorBufferFloat::IsSupported(const WebGLContext* webgl) {
+  if (webgl->IsWebGL2()) return false;
+
+  const auto& gl = webgl->gl;
+  return gl->IsSupported(gl::GLFeature::renderbuffer_color_float) &&
+         gl->IsSupported(gl::GLFeature::frag_color_float);
+}
+
+}  // namespace mozilla