#pragma once #include <GL/glew.h> #include <array> #include <glm/common.hpp> #include <glm/fwd.hpp> template<typename T> struct gl_traits; struct gl_traits_base { static constexpr GLint size {1}; }; struct gl_traits_float : public gl_traits_base { static constexpr auto vertexAttribFunc { [](GLuint index, GLint size, GLenum type, GLsizei stride, const void * pointer) -> GLuint { glVertexAttribPointer(index, size, type, GL_FALSE, stride, pointer); return 1; }}; }; struct gl_traits_longfloat : public gl_traits_base { static constexpr auto vertexAttribFunc { [](GLuint index, GLint size, GLenum type, GLsizei stride, const void * pointer) -> GLuint { glVertexAttribLPointer(index, size, type, stride, pointer); return 1; }}; }; struct gl_traits_integer : public gl_traits_base { static constexpr auto vertexAttribFunc { [](GLuint index, GLint size, GLenum type, GLsizei stride, const void * pointer) -> GLuint { glVertexAttribIPointer(index, size, type, stride, pointer); return 1; }}; }; template<> struct gl_traits<glm::f32> : public gl_traits_float { static constexpr GLenum type {GL_FLOAT}; }; template<> struct gl_traits<glm::f64> : public gl_traits_longfloat { static constexpr GLenum type {GL_DOUBLE}; }; template<> struct gl_traits<glm::int8> : public gl_traits_integer { static constexpr GLenum type {GL_BYTE}; }; template<> struct gl_traits<glm::int16> : public gl_traits_integer { static constexpr GLenum type {GL_SHORT}; }; template<> struct gl_traits<glm::int32> : public gl_traits_integer { static constexpr GLenum type {GL_INT}; }; template<> struct gl_traits<glm::uint8> : public gl_traits_integer { static constexpr GLenum type {GL_UNSIGNED_BYTE}; }; template<> struct gl_traits<glm::uint16> : public gl_traits_integer { static constexpr GLenum type {GL_UNSIGNED_SHORT}; }; template<> struct gl_traits<glm::uint32> : public gl_traits_integer { static constexpr GLenum type {GL_UNSIGNED_INT}; }; template<typename T, std::size_t S> struct gl_traits<std::array<T, S>> : public gl_traits<T> { static constexpr GLint size {S * gl_traits<T>::size}; }; template<glm::length_t L, typename T, glm::qualifier Q> struct gl_traits<glm::vec<L, T, Q>> : public gl_traits<T> { static constexpr GLint size {L}; }; template<glm::length_t C, glm::length_t R, typename T, glm::qualifier Q> struct gl_traits<glm::mat<C, R, T, Q>> : public gl_traits<T> { static constexpr GLint size {C * R}; static constexpr auto vertexAttribFunc { [](GLuint index, GLint, GLenum type, GLsizei stride, const void * pointer) -> GLuint { const auto base = static_cast<const T *>(pointer); for (GLuint r = 0; r < R; r++) { glVertexAttribPointer(index + r, C, type, GL_FALSE, stride, base + (r * C)); } return R; }}; };