#pragma once #include <array> #include <glad/gl.h> #include <glm/common.hpp> #include <glm/fwd.hpp> #include <glm/gtc/type_ptr.hpp> #include <span> 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}; static constexpr auto glUniformFunc {&glUniform1f}; static constexpr std::array glUniformvFunc {&glUniform1fv, &glUniform2fv, &glUniform3fv, &glUniform4fv}; static constexpr std::array glUniformmFunc {&glUniformMatrix2fv, &glUniformMatrix3fv, &glUniformMatrix4fv}; static constexpr auto glTexParameterFunc {&glTexParameterf}; static constexpr auto glTexParameterfFunc {&glTexParameterfv}; }; 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}; static constexpr auto glUniformFunc {&glUniform1i}; static constexpr std::array glUniformvFunc {&glUniform1iv, &glUniform2iv, &glUniform3iv, &glUniform4iv}; static constexpr auto glTexParameterFunc {&glTexParameteri}; static constexpr auto glTexParameterfFunc {&glTexParameteriv}; }; 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}; static constexpr auto glUniformFunc {&glUniform1ui}; static constexpr std::array<decltype(&glUniform1uiv), 5> glUniformvFunc { &glUniform1uiv, &glUniform2uiv, &glUniform3uiv, &glUniform4uiv}; }; 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}; 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 e = 0; e < S; e++) { glVertexAttribPointer(index + e, gl_traits<T>::size, type, GL_FALSE, stride, base + e); } return S; }}; }; 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; }}; }; template<typename T> concept has_glUniform1 = requires { gl_traits<T>::glUniformFunc; }; template<typename T> concept has_glUniformNv = requires { gl_traits<T>::glUniformvFunc; }; template<typename T> concept has_glUniformMatrixNv = requires { gl_traits<T>::glUniformmFunc; }; template<typename T> concept has_glTexParameter = requires { gl_traits<T>::glTexParameterFunc; }; template<typename T> concept has_glTexParameterf = requires { gl_traits<T>::glTexParameterfFunc; }; template<has_glUniform1 T> void glUniform(GLint location, T v) { (*gl_traits<T>::glUniformFunc)(location, v); } template<glm::length_t L, has_glUniformNv T, glm::qualifier Q> void glUniform(GLint location, const glm::vec<L, T, Q> & v) { (*gl_traits<T>::glUniformvFunc[L - 1])(location, 1, glm::value_ptr(v)); } template<glm::length_t L, has_glUniformNv T, glm::qualifier Q> void glUniform(GLint location, std::span<const glm::vec<L, T, Q>> v) { (*gl_traits<T>::glUniformvFunc[L - 1])(location, static_cast<GLsizei>(v.size()), glm::value_ptr(v.front())); } template<has_glUniformNv T> void glUniform(GLint location, std::span<const T> v) { (*gl_traits<T>::glUniformvFunc.front())(location, static_cast<GLsizei>(v.size()), v.data()); } template<glm::length_t L, has_glUniformMatrixNv T, glm::qualifier Q> void glUniform(GLint location, const glm::mat<L, L, T, Q> & v) { (*gl_traits<T>::glUniformmFunc[L - 2])(location, 1, GL_FALSE, glm::value_ptr(v)); } template<glm::length_t L, has_glUniformMatrixNv T, glm::qualifier Q> void glUniform(GLint location, std::span<const glm::mat<L, L, T, Q>> v) { (*gl_traits<T>::glUniformmFunc[L - 2])( location, static_cast<GLsizei>(v.size()), GL_FALSE, glm::value_ptr(v.front())); } template<has_glTexParameter T> void glTexParameter(GLenum target, GLenum pname, T param) { (*gl_traits<T>::glTexParameterFunc)(target, pname, param); } template<glm::length_t L, has_glTexParameterf T, glm::qualifier Q> void glTexParameter(GLenum target, GLenum pname, const glm::vec<L, T, Q> & param) { (*gl_traits<T>::glTexParameterfFunc)(target, pname, glm::value_ptr(param)); }