1 files changed, 57 insertions, 0 deletions
diff --git a/dom/canvas/WebGLContextUtils.h b/dom/canvas/WebGLContextUtils.h
new file mode 100644
index 0000000000..2f746be9cb
--- /dev/null
+++ b/dom/canvas/WebGLContextUtils.h
@@ -0,0 +1,57 @@
+/* -*- 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/. */
+
+#ifndef WEBGL_CONTEXT_UTILS_H_
+#define WEBGL_CONTEXT_UTILS_H_
+
+#include "WebGLStrongTypes.h"
+#include "WebGLTypes.h"
+
+namespace mozilla {
+
+// For use with the different texture calls, i.e.
+//   TexImage2D, CopyTex[Sub]Image2D, ...
+// that take a "target" parameter. This parameter is not always the same as
+// the texture binding location, like GL_TEXTURE_2D or GL_TEXTURE_CUBE_MAP.
+// For example, cube maps would pass GL_TEXTURE_CUBE_MAP_[POS|NEG]_[X|Y|Z]
+// instead of just GL_TEXTURE_CUBE_MAP.
+//
+// This function converts the texture image target to the texture target a.k.a.
+// binding location. The returned binding location can be used to check that
+// the currently bound texture is appropriate for this texImageTarget.
+//
+// Returns GL_NONE if passed an invalid texture image target
+TexTarget TexImageTargetToTexTarget(TexImageTarget texImageTarget);
+
+struct GLComponents {
+  unsigned char mComponents;
+
+  enum Components {
+    Red = (1 << 0),
+    Green = (1 << 1),
+    Blue = (1 << 2),
+    Alpha = (1 << 3),
+    Stencil = (1 << 4),
+    Depth = (1 << 5),
+  };
+
+  GLComponents() : mComponents(0) {}
+
+  explicit GLComponents(TexInternalFormat format);
+
+  // Returns true iff other has all (or more) of
+  // the components present in this GLComponents
+  bool IsSubsetOf(const GLComponents& other) const;
+};
+
+/**
+ * Return the displayable name for the texture function that is the
+ * source for validation.
+ */
+const char* InfoFrom(WebGLTexImageFunc func, WebGLTexDimensions dims);
+
+}  // namespace mozilla
+
+#endif  // WEBGL_CONTEXT_UTILS_H_