/*
 *	Copyright (C) 2011-2014 Gregory hainaut
 *	Copyright (C) 2007-2009 Gabest
 *
 *  This Program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *
 *  This Program 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 GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA USA.
 *  http://www.gnu.org/copyleft/gpl.html
 *
 */

#pragma once

#define GL_TEX_LEVEL_0 (0)
#define GL_TEX_LEVEL_1 (1)
#define GL_FB_DEFAULT  (0)
#define GL_BUFFER_0    (0)

#ifndef GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR
#define GL_CONTEXT_FLAG_NO_ERROR_BIT_KHR  0x00000008
#endif

// FIX compilation issue with Mesa 10
#include "glext_extra.h"

/*************************************************************
 * Extra define not provided in glcorearb.h
 * Currently they are included in the legacy glext.h but the plan
 * is to move to core only OpenGL
 ************************************************************/

// Extension not in core profile. It will become irrelevant with sparse texture
#ifndef GL_TEXTURE_FREE_MEMORY_ATI
#define GL_TEXTURE_FREE_MEMORY_ATI 0x87FC
#endif
#ifndef GL_NVX_gpu_memory_info
#define GL_NVX_gpu_memory_info 1
#define GL_GPU_MEMORY_INFO_DEDICATED_VIDMEM_NVX 0x9047
#define GL_GPU_MEMORY_INFO_TOTAL_AVAILABLE_MEMORY_NVX 0x9048
#define GL_GPU_MEMORY_INFO_CURRENT_AVAILABLE_VIDMEM_NVX 0x9049
#define GL_GPU_MEMORY_INFO_EVICTION_COUNT_NVX 0x904A
#define GL_GPU_MEMORY_INFO_EVICTED_MEMORY_NVX 0x904B
#endif /* GL_NVX_gpu_memory_info */

// Added in GL4.6. Code should be updated but driver support...
#ifndef GL_TEXTURE_MAX_ANISOTROPY_EXT
#define GL_TEXTURE_MAX_ANISOTROPY_EXT     0x84FE
#endif

// Believe me or not, they forgot to add the interaction with DSA...
#ifndef GL_EXT_direct_state_access
typedef void (APIENTRYP PFNGLTEXTUREPAGECOMMITMENTEXTPROC) (GLuint texture, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLboolean commit);
#endif

// **********************  End of the extra header ******************* //

// #define ENABLE_GL_ARB_ES3_2_compatibility 1
// #define ENABLE_GL_ARB_bindless_texture 1
// #define ENABLE_GL_ARB_cl_event 1
// #define ENABLE_GL_ARB_compute_variable_group_size 1
// #define ENABLE_GL_ARB_debug_output 1
// #define ENABLE_GL_ARB_draw_buffers_blend 1
// #define ENABLE_GL_ARB_draw_instanced 1
// #define ENABLE_GL_ARB_geometry_shader4 1
// #define ENABLE_GL_ARB_gl_spirv 1
// #define ENABLE_GL_ARB_gpu_shader_int64 1
// #define ENABLE_GL_ARB_indirect_parameters 1
// #define ENABLE_GL_ARB_instanced_arrays 1
// #define ENABLE_GL_ARB_parallel_shader_compile 1
// #define ENABLE_GL_ARB_robustness 1
// #define ENABLE_GL_ARB_sample_locations 1
// #define ENABLE_GL_ARB_sample_shading 1
// #define ENABLE_GL_ARB_shading_language_include 1
// #define ENABLE_GL_ARB_sparse_buffer 1
#define ENABLE_GL_ARB_sparse_texture 1
// #define ENABLE_GL_ARB_texture_buffer_object 1
// #define ENABLE_GL_KHR_blend_equation_advanced 1
// #define ENABLE_GL_KHR_parallel_shader_compile 1

// Dark age of openGL. GL_10 and GL_11 are provided by opengl32.dll on windows.
// Linux is a royal mess
//
// #define ENABLE_GL_VERSION_1_0 1
// #define ENABLE_GL_VERSION_1_1 1
#ifdef _WIN32
#define ENABLE_GL_VERSION_1_2 1
#define ENABLE_GL_VERSION_1_3 1
#define ENABLE_GL_VERSION_1_4 1
#endif

#define ENABLE_GL_VERSION_1_5 1
#define ENABLE_GL_VERSION_2_0 1
#define ENABLE_GL_VERSION_2_1 1
#define ENABLE_GL_VERSION_3_0 1
#define ENABLE_GL_VERSION_3_1 1
#define ENABLE_GL_VERSION_3_2 1
#define ENABLE_GL_VERSION_3_3 1
#define ENABLE_GL_VERSION_4_0 1
#define ENABLE_GL_VERSION_4_1 1
#define ENABLE_GL_VERSION_4_2 1
#define ENABLE_GL_VERSION_4_3 1
#define ENABLE_GL_VERSION_4_4 1
#define ENABLE_GL_VERSION_4_5 1
// #define ENABLE_GL_VERSION_4_6 1

// It should be done by ENABLE_GL_VERSION_1_4 but it conflicts with the old gl.h
#if defined(__unix__) || defined(__APPLE__)
extern   PFNGLBLENDFUNCSEPARATEPROC             glBlendFuncSeparate;
#endif
extern   PFNGLTEXTUREPAGECOMMITMENTEXTPROC      glTexturePageCommitmentEXT;

#include "PFN_GLLOADER_HPP.h"

namespace GLExtension {
	extern bool Has(const std::string& ext);
	extern void Set(const std::string& ext, bool v = true);
}

namespace GLLoader {
	void check_gl_requirements();

	extern bool vendor_id_amd;
	extern bool vendor_id_nvidia;
	extern bool vendor_id_intel;
	extern bool amd_legacy_buggy_driver;
	extern bool mesa_driver;
	extern bool buggy_sso_dual_src;
	extern bool in_replayer;

	// GL
	extern bool found_geometry_shader;
	extern bool found_GL_ARB_gpu_shader5;
	extern bool found_GL_ARB_shader_image_load_store;
	extern bool found_GL_ARB_clear_texture;

	extern bool found_compatible_GL_ARB_sparse_texture2;
	extern bool found_compatible_sparse_depth;
}