refactor opengl shader and add shader builder

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

@@ -0,0 +1,52 @@
+#pragma once
+
+#include "./shader.hpp"
+
+#include <vector>
+
+namespace MM::OpenGL {
+
+	class ShaderBuilder {
+		private:
+			ShaderBuilder(void);
+
+			struct stage_t {
+				uint32_t id = 0;
+				bool fail = false;
+			};
+
+			enum stage_e {
+				VERTEX = 0,
+				FRAGMENT,
+				stage_e_MAX
+			};
+
+			stage_t _stages[stage_e_MAX];
+
+			struct transform_feedback_varying_t {
+				std::string var;
+			};
+			std::vector<transform_feedback_varying_t> _tfs;
+
+			bool _tf_interleaved = false;
+
+		public:
+			~ShaderBuilder(void);
+			ShaderBuilder& operator=(ShaderBuilder&) = delete;
+
+			static ShaderBuilder start(void);
+			std::shared_ptr<Shader> finish(void);
+
+		public:
+			ShaderBuilder& addStageVertex(const std::string& shader_code);
+			ShaderBuilder& addStageVertexF(MM::Engine& engine, const std::string& file_path);
+			ShaderBuilder& addStageFragment(const std::string& shader_code);
+			ShaderBuilder& addStageFragmentF(MM::Engine& engine, const std::string& file_path);
+			// TODO: geometry and tesselation stages
+
+			ShaderBuilder& addTransformFeedbackVarying(const std::string& var_name);
+			ShaderBuilder& setTransformFeedbackInterleaved(bool interleaved = true);
+	};
+
+} // MM::OpenGL
+