uniform.hpp

#pragma once

#include <mbgl/util/type_list.hpp>
#include <mbgl/util/indexed_tuple.hpp>

#include <array>

#define MBGL_DEFINE_UNIFORM_SCALAR(type_, name_) \
    struct name_ {                               \
        using Value = type_;                     \
        static constexpr auto name() {           \
            return #name_;                       \
        }                                        \
    }

#define MBGL_DEFINE_UNIFORM_VECTOR(type_, n_, name_) \
    struct name_ {                                   \
        using Value = std::array<type_, n_>;         \
        static constexpr auto name() {               \
            return #name_;                           \
        }                                            \
    }

#define MBGL_DEFINE_UNIFORM_MATRIX(type_, n_, name_) \
    struct name_ {                                   \
        using Value = std::array<type_, n_ * n_>;    \
        static constexpr auto name() {               \
            return #name_;                           \
        }                                            \
    }

namespace mbgl {
namespace gfx {

template <class>
class UniformValues;

template <class... Us>
class UniformValues<TypeList<Us...>> final : public IndexedTuple<TypeList<Us...>, TypeList<typename Us::Value...>> {
    using Base = IndexedTuple<TypeList<Us...>, TypeList<typename Us::Value...>>;

public:
    template <class... Args>
    UniformValues(Args&&... args)
        : Base(std::forward<Args>(args)...) {}
};

} // namespace gfx
} // namespace mbgl