shader.h

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#pragma once
 
#include <liboscar/graphics/shader_property_type.h>
#include <liboscar/utilities/copy_on_upd_shared_value.h>
 
#include <cstddef>
#include <iosfwd>
#include <optional>
#include <string_view>
 
namespace osc
{
    // a handle to a shader
    class Shader final {
    public:
        // throws on compile error
        Shader(
            std::string_view vertex_shader_src,
            std::string_view fragment_shader_src
        );
 
        // throws on compile error
        Shader(
            std::string_view vertex_shader_src,
            std::string_view geometry_shader_src,
            std::string_view fragment_shader_src
        );
 
        size_t num_properties() const;
        std::optional<size_t> property_index(std::string_view property_name) const;
        std::string_view property_name(size_t) const;
        ShaderPropertyType property_type(size_t) const;
 
        friend bool operator==(const Shader&, const Shader&) = default;
 
    private:
        friend std::ostream& operator<<(std::ostream&, const Shader&);
        friend class GraphicsBackend;
 
        class Impl;
        CopyOnUpdSharedValue<Impl> impl_;
    };
 
    std::ostream& operator<<(std::ostream&, const Shader&);
}