initial import, >900commits predate this

framework/opengl_primitives/src/mm/opengl/instance_buffer.hpp

@@ -0,0 +1,81 @@
+//
+// Created by FlaXxy on 25.08.2018.
+//
+
+#pragma once
+
+#ifdef MM_OPENGL_3_GLES
+	#include <GLES3/gl3.h>
+#else
+	#include <glad/glad.h>
+#endif
+
+#include <cstdint>
+//#include <logger.hpp>
+
+namespace MM::OpenGL {
+
+	template<typename TInstance>
+	class InstanceBuffer {
+		private:
+			GLuint _handle;
+			size_t _size;
+
+		public:
+			explicit InstanceBuffer(void) : _handle(0), _size(0) {
+				glGenBuffers(1, &_handle);
+			}
+
+			~InstanceBuffer(void) {
+				glDeleteBuffers(1, &_handle);
+			}
+
+			void bind(GLenum target = GL_ARRAY_BUFFER) const {
+				glBindBuffer(target, _handle);
+			}
+
+			void unbind(GLenum target = GL_ARRAY_BUFFER) const {
+				glBindBuffer(target, 0);
+			}
+
+			void resize(size_t size, GLenum usage) {
+				glBindBuffer(GL_ARRAY_BUFFER, _handle);
+				glBufferData(GL_ARRAY_BUFFER, size * sizeof(TInstance), nullptr, usage);
+				_size = size;
+			}
+
+			size_t getSize(void) const {
+				return _size;
+			}
+
+			TInstance* map(size_t size, GLenum usage = GL_DYNAMIC_DRAW, bool shrink = false) {
+				if (size > _size || (shrink && (size < _size)))
+					resize(size, usage);
+
+				glBindBuffer(GL_ARRAY_BUFFER, _handle);
+
+				auto* res = static_cast<TInstance*>(
+					glMapBufferRange(
+						GL_ARRAY_BUFFER,
+						0,
+						size * sizeof(TInstance),
+						GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_BUFFER_BIT
+					)
+				);
+				//auto* res = static_cast<TInstance*>(
+					//glMapBuffer(
+						//GL_ARRAY_BUFFER,
+						//GL_WRITE_ONLY
+					//)
+				//);
+
+				return res;
+			}
+
+			void unmap(void) {
+				glBindBuffer(GL_ARRAY_BUFFER,_handle);
+				glUnmapBuffer(GL_ARRAY_BUFFER);
+			}
+	};
+} // MM::OpenGL
+