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#pragma once
#include <mbgl/gfx/types.hpp>
#include <mbgl/util/variant.hpp>
#include <mbgl/util/color.hpp>
namespace mbgl {
namespace gfx {
class ColorMode {
public:
template <ColorBlendEquationType E>
struct ConstantBlend {
static constexpr ColorBlendEquationType equation = E;
static constexpr ColorBlendFactorType srcFactor = ColorBlendFactorType::One;
static constexpr ColorBlendFactorType dstFactor = ColorBlendFactorType::One;
};
template <ColorBlendEquationType E>
struct LinearBlend {
static constexpr ColorBlendEquationType equation = E;
ColorBlendFactorType srcFactor;
ColorBlendFactorType dstFactor;
};
struct Replace {
static constexpr ColorBlendEquationType equation = ColorBlendEquationType::Add;
static constexpr ColorBlendFactorType srcFactor = ColorBlendFactorType::One;
static constexpr ColorBlendFactorType dstFactor = ColorBlendFactorType::Zero;
};
using Add = LinearBlend<ColorBlendEquationType::Add>;
using Subtract = LinearBlend<ColorBlendEquationType::Subtract>;
using ReverseSubtract = LinearBlend<ColorBlendEquationType::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{ ColorBlendFactorType::One, ColorBlendFactorType::OneMinusSrcAlpha }, {}, { true, true, true, true } };
}
static ColorMode additive() {
return { Add{ ColorBlendFactorType::One, ColorBlendFactorType::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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