string_ref.hpp

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#ifndef OGLPLUS_GLSL_STRING_REF_HPP
#define OGLPLUS_GLSL_STRING_REF_HPP
 
#include "source_ref.hpp"
#include <eagine/memory/block.hpp>
 
namespace eagine::oglp {
//------------------------------------------------------------------------------
class glsl_string_ref {
public:
    using char_type = gl_types::char_type;
 
    using int_type = gl_types::int_type;
 
    glsl_string_ref(const char* src_str, span_size_t n) noexcept
      : _src_str(static_cast<const char_type*>(src_str))
      , _length(int_type(n == 0 ? 0 : (src_str[n - 1] == '\0' ? n - 1 : n))) {}
 
    explicit glsl_string_ref(string_view str) noexcept
      : glsl_string_ref(str.data(), str.size()) {}
 
    explicit glsl_string_ref(memory::const_block blk) noexcept
      : glsl_string_ref(as_chars(blk)) {}
 
    operator glsl_source_ref() const noexcept {
        return glsl_source_ref(1, &_src_str, &_length);
    }
 
private:
    mutable const char_type* _src_str{nullptr};
    int_type _length{0};
};
//------------------------------------------------------------------------------
class glsl_literal : public glsl_string_ref {
public:
    template <span_size_t N>
    glsl_literal(const char (&src_str)[N]) noexcept
      : glsl_string_ref(static_cast<const char*>(src_str), N) {}
};
//------------------------------------------------------------------------------
static inline auto operator"" _glsl(const char* src_str, std::size_t n) noexcept
  -> glsl_string_ref {
    return {src_str, span_size(n)};
}
//------------------------------------------------------------------------------
} // namespace eagine::oglp
 
#endif // OGLPLUS_GLSL_STRING_REF_HPP