isolate some GL stuff

[tacos.git] / src / graphics / gl_traits.hpp

diff --git a/src/graphics/gl_traits.hpp b/src/graphics/gl_traits.hpp
new file mode 100644 (file)
index 0000000..43caf03
--- /dev/null
+++ b/src/graphics/gl_traits.hpp
@@ -0,0 +1,119 @@
+#ifndef TACOS_GRAPHICS_GL_TRAITS_HPP_
+#define TACOS_GRAPHICS_GL_TRAITS_HPP_
+
+#include <GL/glew.h>
+#include <glm/glm.hpp>
+
+
+namespace tacos {
+
+template<class T>
+struct gl_traits {
+
+       /// number of components per generic attribute
+       /// must be 1, 2, 3, 4
+       // static constexpr GLint size;
+
+       /// component type
+       /// accepted values are:
+       ///   GL_BYTE, GL_UNSIGNED_BYTE,
+       ///   GL_SHORT, GL_UNSIGNED_SHORT,
+       ///   GL_INT, GL_UNSIGNED_INT,
+       ///   GL_HALF_FLOAT, GL_FLOAT, GL_DOUBLE,
+       ///   GL_FIXED, GL_INT_2_10_10_10_REV, GL_UNSIGNED_INT_2_10_10_10_REV
+       // static constexpr GLenum type;
+
+};
+
+
+// basic types
+
+template<> struct gl_traits<signed char> {
+       static constexpr GLint size = 1;
+       static constexpr GLenum type = GL_BYTE;
+};
+
+template<> struct gl_traits<unsigned char> {
+       static constexpr GLint size = 1;
+       static constexpr GLenum type = GL_UNSIGNED_BYTE;
+};
+
+template<> struct gl_traits<short> {
+       static constexpr GLint size = 1;
+       static constexpr GLenum type = GL_SHORT;
+};
+
+template<> struct gl_traits<unsigned short> {
+       static constexpr GLint size = 1;
+       static constexpr GLenum type = GL_UNSIGNED_SHORT;
+};
+
+template<> struct gl_traits<int> {
+       static constexpr GLint size = 1;
+       static constexpr GLenum type = GL_INT;
+};
+
+template<> struct gl_traits<unsigned int> {
+       static constexpr GLint size = 1;
+       static constexpr GLenum type = GL_UNSIGNED_INT;
+};
+
+template<> struct gl_traits<float> {
+       static constexpr GLint size = 1;
+       static constexpr GLenum type = GL_FLOAT;
+};
+
+template<> struct gl_traits<double> {
+       static constexpr GLint size = 1;
+       static constexpr GLenum type = GL_DOUBLE;
+};
+
+// composite types
+
+template<>
+template<class T, glm::precision P>
+struct gl_traits<glm::tvec1<T, P>> {
+       static constexpr GLint size = 1;
+       static constexpr GLenum type = gl_traits<T>::type;
+};
+template<class T, glm::precision P>
+constexpr GLint gl_traits<glm::tvec1<T, P>>::size;
+template<class T, glm::precision P>
+constexpr GLenum gl_traits<glm::tvec1<T, P>>::type;
+
+template<>
+template<class T, glm::precision P>
+struct gl_traits<glm::tvec2<T, P>> {
+       static constexpr GLint size = 2;
+       static constexpr GLenum type = gl_traits<T>::type;
+};
+template<class T, glm::precision P>
+constexpr GLint gl_traits<glm::tvec2<T, P>>::size;
+template<class T, glm::precision P>
+constexpr GLenum gl_traits<glm::tvec2<T, P>>::type;
+
+template<>
+template<class T, glm::precision P>
+struct gl_traits<glm::tvec3<T, P>> {
+       static constexpr GLint size = 3;
+       static constexpr GLenum type = gl_traits<T>::type;
+};
+template<class T, glm::precision P>
+constexpr GLint gl_traits<glm::tvec3<T, P>>::size;
+template<class T, glm::precision P>
+constexpr GLenum gl_traits<glm::tvec3<T, P>>::type;
+
+template<>
+template<class T, glm::precision P>
+struct gl_traits<glm::tvec4<T, P>> {
+       static constexpr GLint size = 4;
+       static constexpr GLenum type = gl_traits<T>::type;
+};
+template<class T, glm::precision P>
+constexpr GLint gl_traits<glm::tvec4<T, P>>::size;
+template<class T, glm::precision P>
+constexpr GLenum gl_traits<glm::tvec4<T, P>>::type;
+
+}
+
+#endif