diff options
Diffstat (limited to 'gfx/gl')
-rw-r--r-- | gfx/gl/vertexArrayObject.hpp | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/gfx/gl/vertexArrayObject.hpp b/gfx/gl/vertexArrayObject.hpp new file mode 100644 index 0000000..d90cc59 --- /dev/null +++ b/gfx/gl/vertexArrayObject.hpp @@ -0,0 +1,76 @@ +#pragma once + +#include "collections.hpp" +#include "gl_traits.hpp" +#include <GL/glew.h> +#include <glm/common.hpp> + +template<typename Vertex> class VertexArrayObject { +public: + template<auto Vertex::*... attribs> + static void + configure(const GLuint arrayObject, const GLuint arrayBuffer, const GLuint indexBuffer, + const SequentialCollection<Vertex> auto & vertices, const SequentialCollection<unsigned int> auto & indices) + { + glBindVertexArray(arrayObject); + + configure_attribs<attribs...>(arrayBuffer); + data(vertices, arrayBuffer, GL_ARRAY_BUFFER); + data(indices, indexBuffer, GL_ELEMENT_ARRAY_BUFFER); + + glBindVertexArray(0); + } + + template<auto Vertex::*... attribs> + static void + configure(const GLuint arrayObject, const GLuint arrayBuffer, const SequentialCollection<Vertex> auto & vertices) + { + glBindVertexArray(arrayObject); + + configure_attribs<attribs...>(arrayBuffer); + data(vertices, arrayBuffer, GL_ARRAY_BUFFER); + + glBindVertexArray(0); + } + + template<auto Vertex::*... attribs> + static void + configure(const GLuint arrayObject, const GLuint arrayBuffer) + { + glBindVertexArray(arrayObject); + + configure_attribs<attribs...>(arrayBuffer); + glBufferData(GL_ARRAY_BUFFER, static_cast<GLsizeiptr>(sizeof(Vertex)), nullptr, GL_DYNAMIC_DRAW); + + glBindVertexArray(0); + } + +private: + template<typename Data> + static void + data(const Data & data, const GLuint arrayBuffer, GLenum target) + { + using Value = typename Data::element_type; + glBindBuffer(target, arrayBuffer); + glBufferData(target, static_cast<GLsizeiptr>(sizeof(Value) * data.size()), data.data(), GL_STATIC_DRAW); + } + + template<auto Vertex::*attrib> + static void + set_pointer(GLuint & vertexArrayId) + { + glEnableVertexAttribArray(vertexArrayId); + using traits = gl_traits<std::decay_t<decltype(std::declval<Vertex>().*attrib)>>; + glVertexAttribPointer(vertexArrayId++, traits::size, traits::type, GL_FALSE, sizeof(Vertex), + &(static_cast<const Vertex *>(nullptr)->*attrib)); + } + + template<auto Vertex::*... attribs> + static void + configure_attribs(const GLuint arrayBuffer) + { + glBindBuffer(GL_ARRAY_BUFFER, arrayBuffer); + GLuint vertexArrayId {}; + (set_pointer<attribs>(vertexArrayId), ...); + } +}; |