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 // Copyright (c) 2021 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef OpenGl_GlTypes_HeaderFile
 #define OpenGl_GlTypes_HeaderFile
 
 // required for correct APIENTRY definition
 #if defined(_WIN32) && !defined(APIENTRY) && !defined(__CYGWIN__) && !defined(__SCITECH_SNAP__)
   #define WIN32_LEAN_AND_MEAN
   #include <windows.h>
 #endif
 
 #if defined(__APPLE__)
   #import <TargetConditionals.h>
 #endif
 
 #ifndef APIENTRY
   #define APIENTRY
 #endif
 #ifndef APIENTRYP
   #define APIENTRYP APIENTRY *
 #endif
 #ifndef GLAPI
   #define GLAPI extern
 #endif
 
 #ifndef GL_APICALL
   #define GL_APICALL GLAPI
 #endif
 
 // exclude modern definitions and system-provided glext.h, should be defined before gl.h inclusion
 #ifndef GL_GLEXT_LEGACY
   #define GL_GLEXT_LEGACY
 #endif
 #ifndef GLX_GLXEXT_LEGACY
   #define GLX_GLXEXT_LEGACY
 #endif
 
 #include <OpenGl_khrplatform.h>
 
 typedef khronos_int8_t   GLbyte;
 typedef khronos_float_t  GLclampf;
 typedef khronos_int32_t  GLfixed;
 typedef short            GLshort;
 typedef unsigned short   GLushort;
 typedef void GLvoid;
 typedef struct __GLsync *GLsync;
 typedef khronos_int64_t  GLint64;
 typedef khronos_uint64_t GLuint64;
 typedef unsigned int     GLenum;
 typedef unsigned int     GLuint;
 typedef char             GLchar;
 typedef khronos_float_t  GLfloat;
 typedef khronos_ssize_t  GLsizeiptr;
 typedef khronos_intptr_t GLintptr;
 typedef unsigned int     GLbitfield;
 typedef int              GLint;
 typedef unsigned char    GLboolean;
 typedef int              GLsizei;
 typedef khronos_uint8_t  GLubyte;
 
 typedef double           GLdouble;
 typedef double           GLclampd;
 
 #define GL_NONE                           0
 
 #define GL_DEPTH_BUFFER_BIT               0x00000100
 #define GL_STENCIL_BUFFER_BIT             0x00000400
 #define GL_COLOR_BUFFER_BIT               0x00004000
 #define GL_FALSE                          0
 #define GL_TRUE                           1
 #define GL_POINTS                         0x0000
 #define GL_LINES                          0x0001
 #define GL_LINE_LOOP                      0x0002
 #define GL_LINE_STRIP                     0x0003
 #define GL_TRIANGLES                      0x0004
 #define GL_TRIANGLE_STRIP                 0x0005
 #define GL_TRIANGLE_FAN                   0x0006
 #define GL_ZERO                           0
 #define GL_ONE                            1
 #define GL_SRC_COLOR                      0x0300
 #define GL_ONE_MINUS_SRC_COLOR            0x0301
 #define GL_SRC_ALPHA                      0x0302
 #define GL_ONE_MINUS_SRC_ALPHA            0x0303
 #define GL_DST_ALPHA                      0x0304
 #define GL_ONE_MINUS_DST_ALPHA            0x0305
 #define GL_DST_COLOR                      0x0306
 #define GL_ONE_MINUS_DST_COLOR            0x0307
 #define GL_SRC_ALPHA_SATURATE             0x0308
 #define GL_FUNC_ADD                       0x8006
 #define GL_BLEND_EQUATION                 0x8009
 #define GL_BLEND_EQUATION_RGB             0x8009
 #define GL_BLEND_EQUATION_ALPHA           0x883D
 #define GL_FUNC_SUBTRACT                  0x800A
 #define GL_FUNC_REVERSE_SUBTRACT          0x800B
 #define GL_BLEND_DST_RGB                  0x80C8
 #define GL_BLEND_SRC_RGB                  0x80C9
 #define GL_BLEND_DST_ALPHA                0x80CA
 #define GL_BLEND_SRC_ALPHA                0x80CB
 #define GL_CONSTANT_COLOR                 0x8001
 #define GL_ONE_MINUS_CONSTANT_COLOR       0x8002
 #define GL_CONSTANT_ALPHA                 0x8003
 #define GL_ONE_MINUS_CONSTANT_ALPHA       0x8004
 #define GL_BLEND_COLOR                    0x8005
 #define GL_ARRAY_BUFFER                   0x8892
 #define GL_ELEMENT_ARRAY_BUFFER           0x8893
 #define GL_ARRAY_BUFFER_BINDING           0x8894
 #define GL_ELEMENT_ARRAY_BUFFER_BINDING   0x8895
 #define GL_STREAM_DRAW                    0x88E0
 #define GL_STATIC_DRAW                    0x88E4
 #define GL_DYNAMIC_DRAW                   0x88E8
 #define GL_BUFFER_SIZE                    0x8764
 #define GL_BUFFER_USAGE                   0x8765
 #define GL_CURRENT_VERTEX_ATTRIB          0x8626
 
 #define GL_FRONT_LEFT                     0x0400
 #define GL_FRONT_RIGHT                    0x0401
 #define GL_BACK_LEFT                      0x0402
 #define GL_BACK_RIGHT                     0x0403
 #define GL_FRONT                          0x0404
 #define GL_BACK                           0x0405
 #define GL_LEFT                           0x0406
 #define GL_RIGHT                          0x0407
 #define GL_FRONT_AND_BACK                 0x0408
 
 #define GL_TEXTURE_2D                     0x0DE1
 #define GL_CULL_FACE                      0x0B44
 #define GL_BLEND                          0x0BE2
 #define GL_DITHER                         0x0BD0
 #define GL_STENCIL_TEST                   0x0B90
 #define GL_DEPTH_TEST                     0x0B71
 #define GL_SCISSOR_TEST                   0x0C11
 
 #define GL_POLYGON_OFFSET_FACTOR          0x8038
 #define GL_POLYGON_OFFSET_UNITS           0x2A00
 #define GL_POLYGON_OFFSET_POINT           0x2A01
 #define GL_POLYGON_OFFSET_LINE            0x2A02
 #define GL_POLYGON_OFFSET_FILL            0x8037
 
 #define GL_SAMPLE_ALPHA_TO_COVERAGE       0x809E
 #define GL_SAMPLE_COVERAGE                0x80A0
 #define GL_NO_ERROR                       0
 #define GL_INVALID_ENUM                   0x0500
 #define GL_INVALID_VALUE                  0x0501
 #define GL_INVALID_OPERATION              0x0502
 #define GL_OUT_OF_MEMORY                  0x0505
 #define GL_CW                             0x0900
 #define GL_CCW                            0x0901
 #define GL_LINE_WIDTH                     0x0B21
 #define GL_ALIASED_POINT_SIZE_RANGE       0x846D
 #define GL_ALIASED_LINE_WIDTH_RANGE       0x846E
 #define GL_CULL_FACE_MODE                 0x0B45
 #define GL_FRONT_FACE                     0x0B46
 #define GL_DEPTH_RANGE                    0x0B70
 #define GL_DEPTH_WRITEMASK                0x0B72
 #define GL_DEPTH_CLEAR_VALUE              0x0B73
 #define GL_DEPTH_FUNC                     0x0B74
 #define GL_STENCIL_CLEAR_VALUE            0x0B91
 #define GL_STENCIL_FUNC                   0x0B92
 #define GL_STENCIL_FAIL                   0x0B94
 #define GL_STENCIL_PASS_DEPTH_FAIL        0x0B95
 #define GL_STENCIL_PASS_DEPTH_PASS        0x0B96
 #define GL_STENCIL_REF                    0x0B97
 #define GL_STENCIL_VALUE_MASK             0x0B93
 #define GL_STENCIL_WRITEMASK              0x0B98
 #define GL_STENCIL_BACK_FUNC              0x8800
 #define GL_STENCIL_BACK_FAIL              0x8801
 #define GL_STENCIL_BACK_PASS_DEPTH_FAIL   0x8802
 #define GL_STENCIL_BACK_PASS_DEPTH_PASS   0x8803
 #define GL_STENCIL_BACK_REF               0x8CA3
 #define GL_STENCIL_BACK_VALUE_MASK        0x8CA4
 #define GL_STENCIL_BACK_WRITEMASK         0x8CA5
 
 #define GL_VIEWPORT                       0x0BA2
 #define GL_SCISSOR_BOX                    0x0C10
 #define GL_COLOR_CLEAR_VALUE              0x0C22
 #define GL_COLOR_WRITEMASK                0x0C23
 
 #define GL_UNPACK_LSB_FIRST               0x0CF1 // only desktop
 #define GL_UNPACK_ROW_LENGTH              0x0CF2
 #define GL_UNPACK_SKIP_ROWS               0x0CF3
 #define GL_UNPACK_SKIP_PIXELS             0x0CF4
 #define GL_UNPACK_ALIGNMENT               0x0CF5
 #define GL_PACK_LSB_FIRST                 0x0D01 // only desktop
 #define GL_PACK_ROW_LENGTH                0x0D02
 #define GL_PACK_SKIP_ROWS                 0x0D03
 #define GL_PACK_SKIP_PIXELS               0x0D04
 #define GL_PACK_ALIGNMENT                 0x0D05
 
 #define GL_MAX_TEXTURE_SIZE               0x0D33
 #define GL_MAX_VIEWPORT_DIMS              0x0D3A
 #define GL_SUBPIXEL_BITS                  0x0D50
 #define GL_RED_BITS                       0x0D52
 #define GL_GREEN_BITS                     0x0D53
 #define GL_BLUE_BITS                      0x0D54
 #define GL_ALPHA_BITS                     0x0D55
 #define GL_DEPTH_BITS                     0x0D56
 #define GL_STENCIL_BITS                   0x0D57
 #define GL_POLYGON_OFFSET_UNITS           0x2A00
 #define GL_POLYGON_OFFSET_FACTOR          0x8038
 #define GL_TEXTURE_BINDING_2D             0x8069
 #define GL_SAMPLE_BUFFERS                 0x80A8
 #define GL_SAMPLES                        0x80A9
 #define GL_SAMPLE_COVERAGE_VALUE          0x80AA
 #define GL_SAMPLE_COVERAGE_INVERT         0x80AB
 #define GL_NUM_COMPRESSED_TEXTURE_FORMATS 0x86A2
 #define GL_COMPRESSED_TEXTURE_FORMATS     0x86A3
 #define GL_DONT_CARE                      0x1100
 #define GL_FASTEST                        0x1101
 #define GL_NICEST                         0x1102
 #define GL_GENERATE_MIPMAP_HINT           0x8192
 #define GL_BYTE                           0x1400
 #define GL_UNSIGNED_BYTE                  0x1401
 #define GL_SHORT                          0x1402
 #define GL_UNSIGNED_SHORT                 0x1403
 #define GL_INT                            0x1404
 #define GL_UNSIGNED_INT                   0x1405
 #define GL_FLOAT                          0x1406
 #define GL_FIXED                          0x140C
 #define GL_DEPTH_COMPONENT                0x1902
 #define GL_ALPHA                          0x1906
 #define GL_RGB                            0x1907
 #define GL_RGBA                           0x1908
 #define GL_LUMINANCE                      0x1909
 #define GL_LUMINANCE_ALPHA                0x190A
 
 #define GL_NEVER                          0x0200
 #define GL_LESS                           0x0201
 #define GL_EQUAL                          0x0202
 #define GL_LEQUAL                         0x0203
 #define GL_GREATER                        0x0204
 #define GL_NOTEQUAL                       0x0205
 #define GL_GEQUAL                         0x0206
 #define GL_ALWAYS                         0x0207
 #define GL_KEEP                           0x1E00
 #define GL_REPLACE                        0x1E01
 #define GL_INCR                           0x1E02
 #define GL_DECR                           0x1E03
 #define GL_INVERT                         0x150A
 #define GL_INCR_WRAP                      0x8507
 #define GL_DECR_WRAP                      0x8508
 #define GL_VENDOR                         0x1F00
 #define GL_RENDERER                       0x1F01
 #define GL_VERSION                        0x1F02
 #define GL_EXTENSIONS                     0x1F03
 #define GL_NEAREST                        0x2600
 #define GL_LINEAR                         0x2601
 #define GL_NEAREST_MIPMAP_NEAREST         0x2700
 #define GL_LINEAR_MIPMAP_NEAREST          0x2701
 #define GL_NEAREST_MIPMAP_LINEAR          0x2702
 #define GL_LINEAR_MIPMAP_LINEAR           0x2703
 #define GL_TEXTURE_MAG_FILTER             0x2800
 #define GL_TEXTURE_MIN_FILTER             0x2801
 #define GL_TEXTURE_WRAP_S                 0x2802
 #define GL_TEXTURE_WRAP_T                 0x2803
 #define GL_TEXTURE                        0x1702
 #define GL_TEXTURE_CUBE_MAP               0x8513
 #define GL_TEXTURE_BINDING_CUBE_MAP       0x8514
 #define GL_TEXTURE_CUBE_MAP_POSITIVE_X    0x8515
 #define GL_TEXTURE_CUBE_MAP_NEGATIVE_X    0x8516
 #define GL_TEXTURE_CUBE_MAP_POSITIVE_Y    0x8517
 #define GL_TEXTURE_CUBE_MAP_NEGATIVE_Y    0x8518
 #define GL_TEXTURE_CUBE_MAP_POSITIVE_Z    0x8519
 #define GL_TEXTURE_CUBE_MAP_NEGATIVE_Z    0x851A
 #define GL_MAX_CUBE_MAP_TEXTURE_SIZE      0x851C
 #define GL_TEXTURE0                       0x84C0
 #define GL_TEXTURE1                       0x84C1
 #define GL_TEXTURE2                       0x84C2
 #define GL_TEXTURE3                       0x84C3
 #define GL_TEXTURE4                       0x84C4
 #define GL_TEXTURE5                       0x84C5
 #define GL_TEXTURE6                       0x84C6
 #define GL_TEXTURE7                       0x84C7
 #define GL_TEXTURE8                       0x84C8
 #define GL_TEXTURE9                       0x84C9
 #define GL_TEXTURE10                      0x84CA
 #define GL_TEXTURE11                      0x84CB
 #define GL_TEXTURE12                      0x84CC
 #define GL_TEXTURE13                      0x84CD
 #define GL_TEXTURE14                      0x84CE
 #define GL_TEXTURE15                      0x84CF
 #define GL_TEXTURE16                      0x84D0
 #define GL_TEXTURE17                      0x84D1
 #define GL_TEXTURE18                      0x84D2
 #define GL_TEXTURE19                      0x84D3
 #define GL_TEXTURE20                      0x84D4
 #define GL_TEXTURE21                      0x84D5
 #define GL_TEXTURE22                      0x84D6
 #define GL_TEXTURE23                      0x84D7
 #define GL_TEXTURE24                      0x84D8
 #define GL_TEXTURE25                      0x84D9
 #define GL_TEXTURE26                      0x84DA
 #define GL_TEXTURE27                      0x84DB
 #define GL_TEXTURE28                      0x84DC
 #define GL_TEXTURE29                      0x84DD
 #define GL_TEXTURE30                      0x84DE
 #define GL_TEXTURE31                      0x84DF
 #define GL_ACTIVE_TEXTURE                 0x84E0
 #define GL_CLAMP                          0x2900
 #define GL_REPEAT                         0x2901
 #define GL_CLAMP_TO_EDGE                  0x812F
 #define GL_MIRRORED_REPEAT                0x8370
 #define GL_FLOAT_VEC2                     0x8B50
 #define GL_FLOAT_VEC3                     0x8B51
 #define GL_FLOAT_VEC4                     0x8B52
 #define GL_INT_VEC2                       0x8B53
 #define GL_INT_VEC3                       0x8B54
 #define GL_INT_VEC4                       0x8B55
 #define GL_BOOL                           0x8B56
 #define GL_BOOL_VEC2                      0x8B57
 #define GL_BOOL_VEC3                      0x8B58
 #define GL_BOOL_VEC4                      0x8B59
 #define GL_FLOAT_MAT2                     0x8B5A
 #define GL_FLOAT_MAT3                     0x8B5B
 #define GL_FLOAT_MAT4                     0x8B5C
 #define GL_SAMPLER_2D                     0x8B5E
 #define GL_SAMPLER_CUBE                   0x8B60
 
 #define GL_COLOR                          0x1800
 #define GL_DEPTH                          0x1801
 #define GL_STENCIL                        0x1802
 #define GL_RED                            0x1903
 #define GL_RGB8                           0x8051
 #define GL_RGBA8                          0x8058
 
 // only in desktop OpenGL
 #define GL_LUMINANCE16  0x8042
 
 // in core since OpenGL ES 3.0, extension GL_OES_rgb8_rgba8
 #define GL_LUMINANCE8   0x8040
 // GL_EXT_texture_format_BGRA8888
 #define GL_BGRA_EXT     0x80E1 // same as GL_BGRA on desktop
 
 #define GL_R16          0x822A
 #define GL_RGB4         0x804F
 #define GL_RGB5         0x8050
 #define GL_RGB10        0x8052
 #define GL_RGB12        0x8053
 #define GL_RGB16        0x8054
 #define GL_RGB10_A2     0x8059
 #define GL_RGBA12       0x805A
 #define GL_RGBA16       0x805B
 #define GL_ALPHA8       0x803C
 #define GL_ALPHA16      0x803E
 #define GL_RG16         0x822C
 
 #define GL_R16_SNORM    0x8F98
 #define GL_RG16_SNORM   0x8F99
 #define GL_RGB16_SNORM  0x8F9A
 #define GL_RGBA16_SNORM 0x8F9B
 
 #define GL_RED_SNORM    0x8F90
 #define GL_RG_SNORM     0x8F91
 #define GL_RGB_SNORM    0x8F92
 #define GL_RGBA_SNORM   0x8F93
 
 #define GL_DRAW_BUFFER                    0x0C01
 #define GL_READ_BUFFER                    0x0C02
 #define GL_DOUBLEBUFFER                   0x0C32
 #define GL_STEREO                         0x0C33
 
 #define GL_PROXY_TEXTURE_2D               0x8064
 #define GL_TEXTURE_WIDTH                  0x1000
 #define GL_TEXTURE_HEIGHT                 0x1001
 #define GL_TEXTURE_INTERNAL_FORMAT        0x1003
 
 // OpenGL ES 3.0+ or OES_texture_half_float
 #define GL_HALF_FLOAT_OES             0x8D61
 
 #endif // OpenGl_GlTypes_HeaderFile

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