gecko-dev/gfx/layers/d3d11/BlendShaderConstants.h

/* -*- 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_