1 files changed, 59 insertions, 0 deletions
diff --git a/gfx/layers/d3d11/BlendShaderConstants.h b/gfx/layers/d3d11/BlendShaderConstants.h
new file mode 100644
index 000000000..d89240c18
--- /dev/null
+++ b/gfx/layers/d3d11/BlendShaderConstants.h
@@ -0,0 +1,59 @@
+/* -*- 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 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
+
+// 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_