/*  PCSX2 - PS2 Emulator for PCs
 *  Copyright (C) 2002-2021  PCSX2 Dev Team
 *
 *  PCSX2 is free software: you can redistribute it and/or modify it under the terms
 *  of the GNU Lesser General Public License as published by the Free Software Found-
 *  ation, either version 3 of the License, or (at your option) any later version.
 *
 *  PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 *  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 *  PURPOSE.  See the GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License along with PCSX2.
 *  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once
#include "../Pcsx2Defs.h"
#include "glad.h"
#include <string_view>
#include <vector>

namespace GL
{
	class Program
	{
	public:
		Program();
		Program(const Program&) = delete;
		Program(Program&& prog);
		~Program();

		static GLuint CompileShader(GLenum type, const std::string_view source);
		static void ResetLastProgram();

		bool IsValid() const { return m_program_id != 0; }

		bool Compile(const std::string_view vertex_shader, const std::string_view fragment_shader);

		bool CompileCompute(const std::string_view glsl);

		bool CreateFromBinary(const void* data, u32 data_length, u32 data_format);

		bool GetBinary(std::vector<u8>* out_data, u32* out_data_format);
		void SetBinaryRetrievableHint();

		void BindAttribute(GLuint index, const char* name);
		void BindDefaultAttributes();

		void BindFragData(GLuint index = 0, const char* name = "o_col0");
		void BindFragDataIndexed(GLuint color_number = 0, const char* name = "o_col0");

		bool Link();

		void Bind() const;

		void Destroy();

		int RegisterUniform(const char* name);
		void Uniform1ui(int index, u32 x) const;
		void Uniform2ui(int index, u32 x, u32 y) const;
		void Uniform3ui(int index, u32 x, u32 y, u32 z) const;
		void Uniform4ui(int index, u32 x, u32 y, u32 z, u32 w) const;
		void Uniform1i(int index, s32 x) const;
		void Uniform2i(int index, s32 x, s32 y) const;
		void Uniform3i(int index, s32 x, s32 y, s32 z) const;
		void Uniform4i(int index, s32 x, s32 y, s32 z, s32 w) const;
		void Uniform1f(int index, float x) const;
		void Uniform2f(int index, float x, float y) const;
		void Uniform3f(int index, float x, float y, float z) const;
		void Uniform4f(int index, float x, float y, float z, float w) const;
		void Uniform2uiv(int index, const u32* v) const;
		void Uniform3uiv(int index, const u32* v) const;
		void Uniform4uiv(int index, const u32* v) const;
		void Uniform2iv(int index, const s32* v) const;
		void Uniform3iv(int index, const s32* v) const;
		void Uniform4iv(int index, const s32* v) const;
		void Uniform2fv(int index, const float* v) const;
		void Uniform3fv(int index, const float* v) const;
		void Uniform4fv(int index, const float* v) const;

		void UniformMatrix2fv(int index, const float* v);
		void UniformMatrix3fv(int index, const float* v);
		void UniformMatrix4fv(int index, const float* v);

		void BindUniformBlock(const char* name, u32 index);

		void SetName(const std::string_view& name);
		void SetFormattedName(const char* format, ...);

		Program& operator=(const Program&) = delete;
		Program& operator=(Program&& prog);

		__fi bool operator==(const Program& rhs) const { return m_program_id == rhs.m_program_id; }
		__fi bool operator!=(const Program& rhs) const { return m_program_id != rhs.m_program_id; }

	private:
		static u32 s_last_program_id;

		GLuint m_program_id = 0;
		GLuint m_vertex_shader_id = 0;
		GLuint m_fragment_shader_id = 0;

		std::vector<GLint> m_uniform_locations;
	};
} // namespace GL