1 files changed, 65 insertions, 0 deletions
diff --git a/gfx/layers/d3d11/BlendShaderConstants.h b/gfx/layers/d3d11/BlendShaderConstants.h
new file mode 100644
index 0000000000..84b2c68a4a
--- /dev/null
+++ b/gfx/layers/d3d11/BlendShaderConstants.h
@@ -0,0 +1,65 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 MOZILLA_GFX_LAYERS_D3D11_BLENDSHADERCONSTANTS_H_
+#define MOZILLA_GFX_LAYERS_D3D11_BLENDSHADERCONSTANTS_H_
+
+// These constants are shared between CompositorD3D11 and the blend pixel
+// shader.
+#define PS_LAYER_RGB 0
+#define PS_LAYER_RGBA 1
+#define PS_LAYER_YCBCR 2
+#define PS_LAYER_COLOR 3
+#define PS_LAYER_NV12 4
+
+// These must be in the same order as the Mask enum.
+#define PS_MASK_NONE 0
+#define PS_MASK 1
+
+// These must be in the same order as CompositionOp.
+#define PS_BLEND_MULTIPLY 0
+#define PS_BLEND_SCREEN 1
+#define PS_BLEND_OVERLAY 2
+#define PS_BLEND_DARKEN 3
+#define PS_BLEND_LIGHTEN 4
+#define PS_BLEND_COLOR_DODGE 5
+#define PS_BLEND_COLOR_BURN 6
+#define PS_BLEND_HARD_LIGHT 7
+#define PS_BLEND_SOFT_LIGHT 8
+#define PS_BLEND_DIFFERENCE 9
+#define PS_BLEND_EXCLUSION 10
+#define PS_BLEND_HUE 11
+#define PS_BLEND_SATURATION 12
+#define PS_BLEND_COLOR 13
+#define PS_BLEND_LUMINOSITY 14
+
+#if defined(__cplusplus)
+namespace mozilla {
+namespace layers {
+
+static inline int BlendOpToShaderConstant(gfx::CompositionOp aOp) {
+  return int(aOp) - int(gfx::CompositionOp::OP_MULTIPLY);
+}
+
+}  // namespace layers
+}  // namespace mozilla
+
+// Sanity checks.
+namespace {
+static inline void BlendShaderConstantAsserts() {
+  static_assert(PS_MASK_NONE == int(mozilla::layers::MaskType::MaskNone),
+                "shader constant is out of sync");
+  static_assert(PS_MASK == int(mozilla::layers::MaskType::Mask),
+                "shader constant is out of sync");
+  static_assert(int(mozilla::gfx::CompositionOp::OP_LUMINOSITY) -
+                        int(mozilla::gfx::CompositionOp::OP_MULTIPLY) ==
+                    14,
+                "shader constants are out of sync");
+}
+}  // anonymous namespace
+#endif
+
+#endif  // MOZILLA_GFX_LAYERS_D3D11_BLENDSHADERCONSTANTS_H_