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#pragma once
#include <mbgl/util/variant.hpp>
#include <mbgl/util/color.hpp>
namespace mbgl {
namespace gl {
class ColorMode {
public:
enum class BlendEquation {
Add = 0x8006,
Subtract = 0x800A,
ReverseSubtract = 0x800B
};
enum BlendFactor {
Zero = 0x0000,
One = 0x0001,
SrcColor = 0x0300,
OneMinusSrcColor = 0x0301,
SrcAlpha = 0x0302,
OneMinusSrcAlpha = 0x0303,
DstAlpha = 0x0304,
OneMinusDstAlpha = 0x0305,
DstColor = 0x0306,
OneMinusDstColor = 0x0307,
SrcAlphaSaturate = 0x0308,
ConstantColor = 0x8001,
OneMinusConstantColor = 0x8002,
ConstantAlpha = 0x8003,
OneMinusConstantAlpha = 0x8004
};
template <BlendEquation E>
struct ConstantBlend {
static constexpr BlendEquation equation = E;
static constexpr BlendFactor srcFactor = One;
static constexpr BlendFactor dstFactor = 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 = One;
static constexpr BlendFactor dstFactor = 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 ColorMode { Replace(), {}, { false, false, false, false } };
}
static ColorMode unblended() {
return ColorMode { Replace(), {}, { true, true, true, true } };
}
static ColorMode alphaBlended() {
return ColorMode { Add { One, OneMinusSrcAlpha }, {}, { 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 gl
} // namespace mbgl
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