109 lines
2.7 KiB
C++
109 lines
2.7 KiB
C++
#pragma once
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#include <mbgl/util/color.hpp>
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#include <mbgl/util/variant.hpp>
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#include <optional>
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#if MLN_DRAWABLE_RENDERER
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namespace mbgl {
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namespace style {
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namespace expression {
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class Expression;
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class Interpolate;
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class Step;
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} // namespace expression
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using ZoomCurvePtr = variant<std::nullptr_t, const expression::Interpolate*, const expression::Step*>;
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} // namespace style
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namespace gfx {
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enum class GPUInterpType : std::uint16_t {
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Step,
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Linear,
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Exponential,
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Bezier
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};
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enum class GPUOutputType : std::uint16_t {
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Float,
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Color,
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};
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enum class GPUOptions : std::uint16_t {
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None = 0,
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IntegerZoom = 1 << 0,
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Transitioning = 1 << 1,
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};
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class GPUExpression;
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using UniqueGPUExpression = std::unique_ptr<GPUExpression>;
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class alignas(16) GPUExpression {
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public:
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static constexpr std::size_t maxStops = 16;
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GPUExpression() = delete;
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GPUExpression(GPUOutputType type, uint16_t count)
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: outputType(type),
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stopCount(count) {}
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GPUExpression(GPUExpression&&) = default;
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GPUExpression(const GPUExpression&) = default;
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GPUExpression(const GPUExpression* ptr)
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: GPUExpression(ptr ? *ptr : empty) {}
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GPUExpression& operator=(GPUExpression&&) = delete;
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GPUExpression& operator=(const GPUExpression&) = delete;
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/* 0 */ const GPUOutputType outputType;
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/* 2 */ const std::uint16_t stopCount;
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/* 4 */ GPUOptions options;
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/* 6 */ GPUInterpType interpolation;
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/* 8 */ union InterpOptions {
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struct Exponential {
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float base;
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} exponential;
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struct Bezier {
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float x1;
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float y1;
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float x2;
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float y2;
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} bezier;
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} interpOptions;
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/* 24 */ float inputs[maxStops];
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/* 24 + (4 * maxStops) = 88 */ union Stops {
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float floats[maxStops];
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float colors[2 * maxStops];
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} stops;
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static UniqueGPUExpression create(GPUOutputType, std::uint16_t stopCount);
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static UniqueGPUExpression create(const style::expression::Expression&, const style::ZoomCurvePtr&, bool intZoom);
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float evaluateFloat(const float zoom) const;
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Color evaluateColor(const float zoom) const;
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template <typename T>
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auto evaluate(const float zoom) const;
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Color getColor(std::size_t index) const;
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static const GPUExpression empty;
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};
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static_assert(sizeof(GPUExpression) == 32 + (4 + 8) * GPUExpression::maxStops);
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static_assert(sizeof(GPUExpression) % 16 == 0);
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template <>
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inline auto GPUExpression::evaluate<Color>(const float zoom) const {
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return evaluateColor(zoom);
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}
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template <>
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inline auto GPUExpression::evaluate<float>(const float zoom) const {
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return evaluateFloat(zoom);
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}
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} // namespace gfx
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} // namespace mbgl
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#endif
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