source_ref.hpp

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#ifndef OGLPLUS_GLSL_SOURCE_REF_HPP
#define OGLPLUS_GLSL_SOURCE_REF_HPP
 
#include "../gl_api/config.hpp"
#include <eagine/assert.hpp>
#include <eagine/string_span.hpp>
#include <cstddef>
 
namespace eagine::oglp {
//------------------------------------------------------------------------------
class glsl_source_ref {
public:
    using char_type = gl_types::char_type;
 
    using int_type = gl_types::int_type;
 
    using sizei_type = gl_types::sizei_type;
 
    constexpr glsl_source_ref(const char_type* part, int_type length) noexcept
      : _part{part}
      , _length{length}
      , _count{1}
      , _parts{&_part}
      , _lengths{&_length} {}
 
    constexpr glsl_source_ref(string_view source_str) noexcept
      : glsl_source_ref(
          memory::accomodate<const char_type>(source_str).data(),
          eagine::limit_cast<int_type>(source_str.size())) {}
 
    glsl_source_ref(
      span_size_t n,
      const char_type** ps,
      const int_type* ls) noexcept
      : _count{eagine::limit_cast<sizei_type>(n)}
      , _parts{ps}
      , _lengths{ls} {
        EAGINE_ASSERT(_count >= 0);
        EAGINE_ASSERT(_parts != nullptr);
    }
 
    constexpr auto count() const noexcept -> sizei_type {
        return _count;
    }
 
    constexpr auto parts() const noexcept -> const char_type** {
        return _parts;
    }
 
    auto lengths() const noexcept -> const int_type* {
        return _lengths;
    }
 
private:
    const char_type* _part{nullptr};
    const int_type _length{0};
    sizei_type _count{0};
    const char_type** _parts{nullptr};
    const int_type* _lengths{nullptr};
};
//------------------------------------------------------------------------------
} // namespace eagine::oglp
 
#endif // OGLPLUS_GLSL_SOURCE_REF_HPP