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#pragma once
#include <mbgl/util/variant.hpp>
#include <mbgl/util/color.hpp>
namespace mbgl {
namespace gfx {
class ColorMode {
public:
enum class BlendEquation {
Add,
Subtract,
ReverseSubtract
};
enum class BlendFactor {
Zero,
One,
SrcColor,
OneMinusSrcColor,
SrcAlpha,
OneMinusSrcAlpha,
DstAlpha,
OneMinusDstAlpha,
DstColor,
OneMinusDstColor,
SrcAlphaSaturate,
ConstantColor,
OneMinusConstantColor,
ConstantAlpha,
OneMinusConstantAlpha
};
template <BlendEquation E>
struct ConstantBlend {
static constexpr BlendEquation equation = E;
static constexpr BlendFactor srcFactor = BlendFactor::One;
static constexpr BlendFactor dstFactor = BlendFactor::One;
};
template <BlendEquation E>
struct LinearBlend {
static constexpr BlendEquation equation = E;
BlendFactor srcFactor;
BlendFactor dstFactor;
};
struct Replace {
static constexpr BlendEquation equation = BlendEquation::Add;
static constexpr BlendFactor srcFactor = BlendFactor::One;
static constexpr BlendFactor dstFactor = BlendFactor::Zero;
};
using Add = LinearBlend<BlendEquation::Add>;
using Subtract = LinearBlend<BlendEquation::Subtract>;
using ReverseSubtract = LinearBlend<BlendEquation::ReverseSubtract>;
using BlendFunction = variant<
Replace,
Add,
Subtract,
ReverseSubtract>;
BlendFunction blendFunction;
Color blendColor;
struct Mask {
bool r;
bool g;
bool b;
bool a;
};
Mask mask;
static ColorMode disabled() {
return { Replace{}, {}, { false, false, false, false } };
}
static ColorMode unblended() {
return { Replace{}, {}, { true, true, true, true } };
}
static ColorMode alphaBlended() {
return { Add{ BlendFactor::One, BlendFactor::OneMinusSrcAlpha }, {}, { true, true, true, true } };
}
static ColorMode additive() {
return { Add{ BlendFactor::One, BlendFactor::One }, {}, { true, true, true, true } };
}
};
constexpr bool operator!=(const ColorMode::Mask& a, const ColorMode::Mask& b) {
return a.r != b.r || a.g != b.g || a.b != b.b || a.a != b.a;
}
} // namespace gfx
} // namespace mbgl
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