1 files changed, 106 insertions, 0 deletions
diff --git a/dom/canvas/WebGL2ContextUniforms.cpp b/dom/canvas/WebGL2ContextUniforms.cpp
new file mode 100644
index 0000000000..5f647a20b8
--- /dev/null
+++ b/dom/canvas/WebGL2ContextUniforms.cpp
@@ -0,0 +1,106 @@
+/* -*- Mode: C++; tab-width: 4; 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 "WebGL2Context.h"
+
+#include "GLContext.h"
+#include "js/Array.h"  // JS::NewArrayObject
+#include "mozilla/dom/WebGL2RenderingContextBinding.h"
+#include "mozilla/RefPtr.h"
+#include "WebGLBuffer.h"
+#include "WebGLContext.h"
+#include "WebGLProgram.h"
+#include "WebGLTransformFeedback.h"
+#include "WebGLVertexArray.h"
+
+namespace mozilla {
+
+// -------------------------------------------------------------------------
+// Uniform Buffer Objects and Transform Feedback Buffers
+
+Maybe<double> WebGL2Context::GetIndexedParameter(const GLenum pname,
+                                                 const uint32_t index) const {
+  const FuncScope funcScope(*this, "getIndexedParameter");
+  if (IsContextLost()) return {};
+
+  if (IsExtensionEnabled(WebGLExtensionID::OES_draw_buffers_indexed)) {
+    switch (pname) {
+      case LOCAL_GL_BLEND_EQUATION_RGB:
+      case LOCAL_GL_BLEND_EQUATION_ALPHA:
+      case LOCAL_GL_BLEND_SRC_RGB:
+      case LOCAL_GL_BLEND_SRC_ALPHA:
+      case LOCAL_GL_BLEND_DST_RGB:
+      case LOCAL_GL_BLEND_DST_ALPHA:
+      case LOCAL_GL_COLOR_WRITEMASK: {
+        const auto limit = MaxValidDrawBuffers();
+        if (index >= limit) {
+          ErrorInvalidValue("`index` (%u) must be < %s (%u)", index,
+                            "MAX_DRAW_BUFFERS", limit);
+          return {};
+        }
+
+        std::array<GLint, 4> data = {};
+        gl->fGetIntegeri_v(pname, index, data.data());
+        auto val = data[0];
+        if (pname == LOCAL_GL_COLOR_WRITEMASK) {
+          val = (bool(data[0]) << 0 | bool(data[1]) << 1 | bool(data[2]) << 2 |
+                 bool(data[3]) << 3);
+        }
+        return Some(val);
+      }
+    }
+  }
+
+  const auto* bindings = &mIndexedUniformBufferBindings;
+  const char* limitStr = "MAX_UNIFORM_BUFFER_BINDINGS";
+  switch (pname) {
+    case LOCAL_GL_UNIFORM_BUFFER_START:
+    case LOCAL_GL_UNIFORM_BUFFER_SIZE:
+      break;
+
+    case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER_START:
+    case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER_SIZE:
+      bindings = &(mBoundTransformFeedback->mIndexedBindings);
+      limitStr = "MAX_TRANSFORM_FEEDBACK_SEPARATE_ATTRIBS";
+      break;
+
+    default:
+      ErrorInvalidEnumArg("pname", pname);
+      return {};
+  }
+
+  if (index >= bindings->size()) {
+    ErrorInvalidValue("`index` must be < %s.", limitStr);
+    return {};
+  }
+  const auto& binding = (*bindings)[index];
+
+  switch (pname) {
+    case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER_START:
+    case LOCAL_GL_UNIFORM_BUFFER_START:
+      return Some(binding.mRangeStart);
+      break;
+
+    case LOCAL_GL_TRANSFORM_FEEDBACK_BUFFER_SIZE:
+    case LOCAL_GL_UNIFORM_BUFFER_SIZE:
+      return Some(binding.mRangeSize);
+
+    default:
+      MOZ_CRASH("impossible");
+  }
+}
+
+void WebGL2Context::UniformBlockBinding(WebGLProgram& program,
+                                        GLuint uniformBlockIndex,
+                                        GLuint uniformBlockBinding) {
+  const FuncScope funcScope(*this, "uniformBlockBinding");
+  if (IsContextLost()) return;
+
+  if (!ValidateObject("program", program)) return;
+
+  program.UniformBlockBinding(uniformBlockIndex, uniformBlockBinding);
+}
+
+}  // namespace mozilla