45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
#pragma once
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#include <string_view>
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#include <type_traits>
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namespace mbgl {
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namespace gfx {
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class Shader;
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// Assert that a type is a valid shader for downcasting.
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// A valid shader must:
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// * Inherit gfx::Shader
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// * Have properly called DECLARE_SHADER_TYPEINFO in the class body
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// * Be a final class
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template <typename T>
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inline constexpr bool is_shader_v = std::is_base_of_v<gfx::Shader, T> &&
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std::is_same_v<std::remove_cv_t<decltype(T::Name)>, std::string_view> &&
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std::is_final_v<T>;
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/// @brief A shader is used as the base class for all programs across any supported
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/// backend API. Shaders are registered with a `gfx::ShaderRegistry` instance.
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class Shader {
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public:
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virtual ~Shader() noexcept = default;
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/// @brief Get the type name of this shader
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/// @return Shader type name
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virtual const std::string_view typeName() const noexcept = 0;
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/// @brief Downcast to a type
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/// @tparam T Derived type
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/// @return Type or nullptr if type info was not a match
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template <typename T, typename std::enable_if_t<is_shader_v<T>, bool>* = nullptr>
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T* to() noexcept {
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if (typeName() != T::Name) {
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return nullptr;
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}
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return static_cast<T*>(this);
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}
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};
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} // namespace gfx
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} // namespace mbgl
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