some OpenGL constants

some OpenGL constants

This is from (https://github.com/peterderivaz/pyopengles/blob/master/gl2.py)

 GL_DEPTH_BUFFER_BIT = 0x00000100
 GL_STENCIL_BUFFER_BIT = 0x00000400
 GL_COLOR_BUFFER_BIT = 0x00004000
 GL_POINTS = 0x0000
 GL_LINES = 0x0001
 GL_LINE_LOOP = 0x0002
 GL_LINE_STRIP = 0x0003
 GL_TRIANGLES = 0x0004
 GL_TRIANGLE_STRIP = 0x0005
 GL_TRIANGLE_FAN = 0x0006
 GL_SRC_COLOR = 0x0300
 GL_ONE_MINUS_SRC_COLOR = 0x0301
 GL_SRC_ALPHA = 0x0302
 GL_ONE_MINUS_SRC_ALPHA = 0x0303
 GL_DST_ALPHA = 0x0304
 GL_ONE_MINUS_DST_ALPHA = 0x0305
 GL_DST_COLOR = 0x0306
 GL_ONE_MINUS_DST_COLOR = 0x0307
 GL_SRC_ALPHA_SATURATE = 0x0308
 GL_FUNC_ADD = 0x8006
 GL_BLEND_EQUATION = 0x8009
 GL_BLEND_EQUATION_RGB = 0x8009
 GL_BLEND_EQUATION_ALPHA = 0x883D
 GL_FUNC_SUBTRACT = 0x800A
 GL_FUNC_REVERSE_SUBTRACT = 0x800B
 GL_BLEND_DST_RGB = 0x80C8
 GL_BLEND_SRC_RGB = 0x80C9
 GL_BLEND_DST_ALPHA = 0x80CA
 GL_BLEND_SRC_ALPHA = 0x80CB
 GL_CONSTANT_COLOR = 0x8001
 GL_ONE_MINUS_CONSTANT_COLOR = 0x8002
 GL_CONSTANT_ALPHA = 0x8003
 GL_ONE_MINUS_CONSTANT_ALPHA = 0x8004
 GL_BLEND_COLOR = 0x8005
 GL_ARRAY_BUFFER = 0x8892
 GL_ELEMENT_ARRAY_BUFFER = 0x8893
 GL_ARRAY_BUFFER_BINDING = 0x8894
 GL_ELEMENT_ARRAY_BUFFER_BINDING = 0x8895
 GL_STREAM_DRAW = 0x88E0
 GL_STATIC_DRAW = 0x88E4
 GL_DYNAMIC_DRAW = 0x88E8
 GL_BUFFER_SIZE = 0x8764
 GL_BUFFER_USAGE = 0x8765
 GL_CURRENT_VERTEX_ATTRIB = 0x8626
 GL_FRONT = 0x0404
 GL_BACK = 0x0405
 GL_FRONT_AND_BACK = 0x0408
 GL_TEXTURE_2D = 0x0DE1
 GL_CULL_FACE = 0x0B44
 GL_BLEND = 0x0BE2
 GL_DITHER = 0x0BD0
 GL_STENCIL_TEST = 0x0B90
 GL_DEPTH_TEST = 0x0B71
 GL_SCISSOR_TEST = 0x0C11
 GL_POLYGON_OFFSET_FILL = 0x8037
 GL_SAMPLE_ALPHA_TO_COVERAGE = 0x809E
 GL_SAMPLE_COVERAGE = 0x80A0
 GL_INVALID_ENUM = 0x0500
 GL_INVALID_VALUE = 0x0501
 GL_INVALID_OPERATION = 0x0502
 GL_OUT_OF_MEMORY = 0x0505
 GL_CW = 0x0900
 GL_CCW = 0x0901
 GL_LINE_WIDTH = 0x0B21
 GL_ALIASED_POINT_SIZE_RANGE = 0x846D
 GL_ALIASED_LINE_WIDTH_RANGE = 0x846E
 GL_CULL_FACE_MODE = 0x0B45
 GL_FRONT_FACE = 0x0B46
 GL_DEPTH_RANGE = 0x0B70
 GL_DEPTH_WRITEMASK = 0x0B72
 GL_DEPTH_CLEAR_VALUE = 0x0B73
 GL_DEPTH_FUNC = 0x0B74
 GL_STENCIL_CLEAR_VALUE = 0x0B91
 GL_STENCIL_FUNC = 0x0B92
 GL_STENCIL_FAIL = 0x0B94
 GL_STENCIL_PASS_DEPTH_FAIL = 0x0B95
 GL_STENCIL_PASS_DEPTH_PASS = 0x0B96
 GL_STENCIL_REF = 0x0B97
 GL_STENCIL_VALUE_MASK = 0x0B93
 GL_STENCIL_WRITEMASK = 0x0B98
 GL_STENCIL_BACK_FUNC = 0x8800
 GL_STENCIL_BACK_FAIL = 0x8801
 GL_STENCIL_BACK_PASS_DEPTH_FAIL = 0x8802
 GL_STENCIL_BACK_PASS_DEPTH_PASS = 0x8803
 GL_STENCIL_BACK_REF = 0x8CA3
 GL_STENCIL_BACK_VALUE_MASK = 0x8CA4
 GL_STENCIL_BACK_WRITEMASK = 0x8CA5
 GL_VIEWPORT = 0x0BA2
 GL_SCISSOR_BOX = 0x0C10
 GL_COLOR_CLEAR_VALUE = 0x0C22
 GL_COLOR_WRITEMASK = 0x0C23
 GL_UNPACK_ALIGNMENT = 0x0CF5
 GL_PACK_ALIGNMENT = 0x0D05
 GL_MAX_TEXTURE_SIZE = 0x0D33
 GL_MAX_VIEWPORT_DIMS = 0x0D3A
 GL_SUBPIXEL_BITS = 0x0D50
 GL_RED_BITS = 0x0D52
 GL_GREEN_BITS = 0x0D53
 GL_BLUE_BITS = 0x0D54
 GL_ALPHA_BITS = 0x0D55
 GL_DEPTH_BITS = 0x0D56
 GL_STENCIL_BITS = 0x0D57
 GL_POLYGON_OFFSET_UNITS = 0x2A00
 GL_POLYGON_OFFSET_FACTOR = 0x8038
 GL_TEXTURE_BINDING_2D = 0x8069
 GL_SAMPLE_BUFFERS = 0x80A8
 GL_SAMPLES = 0x80A9
 GL_SAMPLE_COVERAGE_VALUE = 0x80AA
 GL_SAMPLE_COVERAGE_INVERT = 0x80AB
 GL_NUM_COMPRESSED_TEXTURE_FORMATS = 0x86A2
 GL_COMPRESSED_TEXTURE_FORMATS = 0x86A3
 GL_DONT_CARE = 0x1100
 GL_FASTEST = 0x1101
 GL_NICEST = 0x1102
 GL_GENERATE_MIPMAP_HINT = 0x8192
 GL_BYTE = 0x1400
 GL_UNSIGNED_BYTE = 0x1401
 GL_SHORT = 0x1402
 GL_UNSIGNED_SHORT = 0x1403
 GL_INT = 0x1404
 GL_UNSIGNED_INT = 0x1405
 GL_FLOAT = 0x1406
 GL_FIXED = 0x140C
 GL_DEPTH_COMPONENT = 0x1902
 GL_ALPHA = 0x1906
 GL_RGB = 0x1907
 GL_RGBA = 0x1908
 GL_LUMINANCE = 0x1909
 GL_LUMINANCE_ALPHA = 0x190A
 GL_UNSIGNED_SHORT_4_4_4_4 = 0x8033
 GL_UNSIGNED_SHORT_5_5_5_1 = 0x8034
 GL_UNSIGNED_SHORT_5_6_5 = 0x8363
 GL_FRAGMENT_SHADER = 0x8B30
 GL_VERTEX_SHADER = 0x8B31
 GL_MAX_VERTEX_ATTRIBS = 0x8869
 GL_MAX_VERTEX_UNIFORM_VECTORS = 0x8DFB
 GL_MAX_VARYING_VECTORS = 0x8DFC
 GL_MAX_COMBINED_TEXTURE_IMAGE_UNITS = 0x8B4D
 GL_MAX_VERTEX_TEXTURE_IMAGE_UNITS = 0x8B4C
 GL_MAX_TEXTURE_IMAGE_UNITS = 0x8872
 GL_MAX_FRAGMENT_UNIFORM_VECTORS = 0x8DFD
 GL_SHADER_TYPE = 0x8B4F
 GL_DELETE_STATUS = 0x8B80
 GL_LINK_STATUS = 0x8B82
 GL_VALIDATE_STATUS = 0x8B83
 GL_ATTACHED_SHADERS = 0x8B85
 GL_ACTIVE_UNIFORMS = 0x8B86
 GL_ACTIVE_UNIFORM_MAX_LENGTH = 0x8B87
 GL_ACTIVE_ATTRIBUTES = 0x8B89
 GL_ACTIVE_ATTRIBUTE_MAX_LENGTH = 0x8B8A
 GL_SHADING_LANGUAGE_VERSION = 0x8B8C
 GL_CURRENT_PROGRAM = 0x8B8D
 GL_NEVER = 0x0200
 GL_LESS = 0x0201
 GL_EQUAL = 0x0202
 GL_LEQUAL = 0x0203
 GL_GREATER = 0x0204
 GL_NOTEQUAL = 0x0205
 GL_GEQUAL = 0x0206
 GL_ALWAYS = 0x0207
 GL_KEEP = 0x1E00
 GL_REPLACE = 0x1E01
 GL_INCR = 0x1E02
 GL_DECR = 0x1E03
 GL_INVERT = 0x150A
 GL_INCR_WRAP = 0x8507
 GL_DECR_WRAP = 0x8508
 GL_VENDOR = 0x1F00
 GL_RENDERER = 0x1F01
 GL_VERSION = 0x1F02
 GL_EXTENSIONS = 0x1F03
 GL_NEAREST = 0x2600
 GL_LINEAR = 0x2601
 GL_NEAREST_MIPMAP_NEAREST = 0x2700
 GL_LINEAR_MIPMAP_NEAREST = 0x2701
 GL_NEAREST_MIPMAP_LINEAR = 0x2702
 GL_LINEAR_MIPMAP_LINEAR = 0x2703
 GL_TEXTURE_MAG_FILTER = 0x2800
 GL_TEXTURE_MIN_FILTER = 0x2801
 GL_TEXTURE_WRAP_S = 0x2802
 GL_TEXTURE_WRAP_T = 0x2803
 GL_TEXTURE = 0x1702
 GL_TEXTURE_CUBE_MAP = 0x8513
 GL_TEXTURE_BINDING_CUBE_MAP = 0x8514
 GL_TEXTURE_CUBE_MAP_POSITIVE_X = 0x8515
 GL_TEXTURE_CUBE_MAP_NEGATIVE_X = 0x8516
 GL_TEXTURE_CUBE_MAP_POSITIVE_Y = 0x8517
 GL_TEXTURE_CUBE_MAP_NEGATIVE_Y = 0x8518
 GL_TEXTURE_CUBE_MAP_POSITIVE_Z = 0x8519
 GL_TEXTURE_CUBE_MAP_NEGATIVE_Z = 0x851A
 GL_MAX_CUBE_MAP_TEXTURE_SIZE = 0x851C
 GL_TEXTURE0 = 0x84C0
 GL_TEXTURE1 = 0x84C1
 GL_TEXTURE2 = 0x84C2
 GL_TEXTURE3 = 0x84C3
 GL_TEXTURE4 = 0x84C4
 GL_TEXTURE5 = 0x84C5
 GL_TEXTURE6 = 0x84C6
 GL_TEXTURE7 = 0x84C7
 GL_TEXTURE8 = 0x84C8
 GL_TEXTURE9 = 0x84C9
 GL_TEXTURE10 = 0x84CA
 GL_TEXTURE11 = 0x84CB
 GL_TEXTURE12 = 0x84CC
 GL_TEXTURE13 = 0x84CD
 GL_TEXTURE14 = 0x84CE
 GL_TEXTURE15 = 0x84CF
 GL_TEXTURE16 = 0x84D0
 GL_TEXTURE17 = 0x84D1
 GL_TEXTURE18 = 0x84D2
 GL_TEXTURE19 = 0x84D3
 GL_TEXTURE20 = 0x84D4
 GL_TEXTURE21 = 0x84D5
 GL_TEXTURE22 = 0x84D6
 GL_TEXTURE23 = 0x84D7
 GL_TEXTURE24 = 0x84D8
 GL_TEXTURE25 = 0x84D9
 GL_TEXTURE26 = 0x84DA
 GL_TEXTURE27 = 0x84DB
 GL_TEXTURE28 = 0x84DC
 GL_TEXTURE29 = 0x84DD
 GL_TEXTURE30 = 0x84DE
 GL_TEXTURE31 = 0x84DF
 GL_ACTIVE_TEXTURE = 0x84E0
 GL_REPEAT = 0x2901
 GL_CLAMP_TO_EDGE = 0x812F
 GL_MIRRORED_REPEAT = 0x8370
 GL_FLOAT_VEC2 = 0x8B50
 GL_FLOAT_VEC3 = 0x8B51
 GL_FLOAT_VEC4 = 0x8B52
 GL_INT_VEC2 = 0x8B53
 GL_INT_VEC3 = 0x8B54
 GL_INT_VEC4 = 0x8B55
 GL_BOOL = 0x8B56
 GL_BOOL_VEC2 = 0x8B57
 GL_BOOL_VEC3 = 0x8B58
 GL_BOOL_VEC4 = 0x8B59
 GL_FLOAT_MAT2 = 0x8B5A
 GL_FLOAT_MAT3 = 0x8B5B
 GL_FLOAT_MAT4 = 0x8B5C
 GL_SAMPLER_2D = 0x8B5E
 GL_SAMPLER_CUBE = 0x8B60
 GL_VERTEX_ATTRIB_ARRAY_ENABLED = 0x8622
 GL_VERTEX_ATTRIB_ARRAY_SIZE = 0x8623
 GL_VERTEX_ATTRIB_ARRAY_STRIDE = 0x8624
 GL_VERTEX_ATTRIB_ARRAY_TYPE = 0x8625
 GL_VERTEX_ATTRIB_ARRAY_NORMALIZED = 0x886A
 GL_VERTEX_ATTRIB_ARRAY_POINTER = 0x8645
 GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING = 0x889F
 GL_IMPLEMENTATION_COLOR_READ_TYPE = 0x8B9A
 GL_IMPLEMENTATION_COLOR_READ_FORMAT = 0x8B9B
 GL_COMPILE_STATUS = 0x8B81
 GL_INFO_LOG_LENGTH = 0x8B84
 GL_SHADER_SOURCE_LENGTH = 0x8B88
 GL_SHADER_COMPILER = 0x8DFA
 GL_SHADER_BINARY_FORMATS = 0x8DF8
 GL_NUM_SHADER_BINARY_FORMATS = 0x8DF9
 GL_LOW_FLOAT = 0x8DF0
 GL_MEDIUM_FLOAT = 0x8DF1
 GL_HIGH_FLOAT = 0x8DF2
 GL_LOW_INT = 0x8DF3
 GL_MEDIUM_INT = 0x8DF4
 GL_HIGH_INT = 0x8DF5
 GL_FRAMEBUFFER = 0x8D40
 GL_RENDERBUFFER = 0x8D41
 GL_RGBA4 = 0x8056
 GL_RGB5_A1 = 0x8057
 GL_RGB565 = 0x8D62
 GL_DEPTH_COMPONENT16 = 0x81A5
 GL_STENCIL_INDEX = 0x1901
 GL_STENCIL_INDEX8 = 0x8D48
 GL_RENDERBUFFER_WIDTH = 0x8D42
 GL_RENDERBUFFER_HEIGHT = 0x8D43
 GL_RENDERBUFFER_INTERNAL_FORMAT = 0x8D44
 GL_RENDERBUFFER_RED_SIZE = 0x8D50
 GL_RENDERBUFFER_GREEN_SIZE = 0x8D51
 GL_RENDERBUFFER_BLUE_SIZE = 0x8D52
 GL_RENDERBUFFER_ALPHA_SIZE = 0x8D53
 GL_RENDERBUFFER_DEPTH_SIZE = 0x8D54
 GL_RENDERBUFFER_STENCIL_SIZE = 0x8D55
 GL_FRAMEBUFFER_ATTACHMENT_OBJECT_TYPE = 0x8CD0
 GL_FRAMEBUFFER_ATTACHMENT_OBJECT_NAME = 0x8CD1
 GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_LEVEL = 0x8CD2
 GL_FRAMEBUFFER_ATTACHMENT_TEXTURE_CUBE_MAP_FACE = 0x8CD3
 GL_COLOR_ATTACHMENT0 = 0x8CE0
 GL_DEPTH_ATTACHMENT = 0x8D00
 GL_STENCIL_ATTACHMENT = 0x8D20
 GL_FRAMEBUFFER_COMPLETE = 0x8CD5
 GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT = 0x8CD6
 GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT = 0x8CD7
 GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS = 0x8CD9
 GL_FRAMEBUFFER_UNSUPPORTED = 0x8CDD
 GL_FRAMEBUFFER_BINDING = 0x8CA6
 GL_RENDERBUFFER_BINDING = 0x8CA7
 GL_MAX_RENDERBUFFER_SIZE = 0x84E8
 GL_INVALID_FRAMEBUFFER_OPERATION = 0x0506

some opengl constants

# Welcome to :art:CSharpGL
[CSharpGL](https://github.com/bitzhuwei/CSharpGL) is a pure C# project that allows for modern OpenGL rendering in a Objected-Oriented way. It meets common requirements in OpenGL rendering such as:
## :rocket:Modern Rendering
Objected-Oriented modern rendering using GLSL shaders and vertex buffer objects.
## :car:Uniform Variables
structs support setting values for uniform variables in GLSL shader.
## :movie_camera:Camera and Rotator
move or rotate camera to get projection and view matrix.
## :pushpin:Color-Coded Picking
PickableRenderer supports picking primitives in multiple vertex buffer objects using Mouse.
## :volcano:GLCanvas
A winform control that supports drag-drop and wraps initialization of creating OpenGL context.
## :slot_machine:GLControl
Rendering 'Control' at fixed position with fixed size. For example, GLAxis renders an axis at left bottom corner.
'Control' binding to specified border just like winform-control.
## :abcd:Text
Rendering text using ``glRasterPos()`` and CallList.
Rendering text using GLText(a special GLControl).
## :tea:Some Models
A Cube, Sphere, Teapot and some other models.
## :cancer:GLSwitch
Wraps OpenGL commands like
```
glEnable(GL_BLEND);
glBlendFunc(GL_SOURCE_ALPHA, GL_ONE_MINUS_DST_ALPHA);
```
or
```
glLineWidth(2.0f);
```
## :ideograph_advantage:Converting TTF file to picture
The project CSharpGL.Font2Picture in :open_file_folder:`Infrastructure` is a quick tool converting TTF files to pictures along with a xml config file.