OpenGL 4.2 (Compatibility Profile) - April 27, 2012

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3.10. TEXTURING 362 3.10.22 Texture Image Loads and Stores The contents of a texture may be made available for shaders to read and write by binding the texture to one of a collection of image units. The GL implementation provides an array of image units numbered beginning with zero, with the total number of image units provided given by the implementation-dependent value of MAX_IMAGE_UNITS. Unlike texture image units, image units do not have a separate attachment for each texture target texture; each image unit may have only one texture bound at a time. A texture may be bound to an image unit for use by image loads and stores with the command void BindImageTexture( uint unit, uint texture, int level, boolean layered, int layer, enum access, enum format ); where unit identifies the image unit, texture is the name of the texture, and level selects a single level of the texture. If texture is zero, any texture currently bound to image unit unit is unbound. If unit is greater than or equal to the value of MAX_- IMAGE_UNITS, if level or layer is less than zero, or if texture is not the name of an existing texture object, the error INVALID_VALUE is generated. If the texture identified by texture is a one-dimensional array, two-dimensional array, three-dimensional, cube map, cube map array, or two-dimensional multisample array texture, it is possible to bind either the entire texture level or a single layer or face of the texture level. If layered is TRUE, the entire level is bound. If layered is FALSE, only the single layer identified by layer will be bound. When layered is FALSE, the single bound layer is treated as a different texture target for image accesses: • one-dimensional array texture layers are treated as one-dimensional textures; • two-dimensional array, three-dimensional, cube map, cube map array texture layers are treated as two-dimensional textures; and • two-dimensional multisample array textures are treated as two-dimensional multisample textures. For cube map textures where layered is FALSE, the face is taken by mapping the layer number to a face according to table 4.13. For cube map array textures where layered is FALSE, the selected layer number is mapped to a texture layer and cube face using the following equations and mapping face to a face according to table 4.13. OpenGL 4.2 (Compatibility Profile) - April 27, 2012
3.10. TEXTURING 363 ⌊ ⌋ layerorig layer = 6 face = layer orig − (layer × 6) If the texture identified by texture does not have multiple layers or faces, the entire texture level is bound, regardless of the values specified for layered and layer. format specifies the format that the elements of the image will be treated as when doing formatted stores, as described later in this section. This is referred to as the image unit format. This must be one of the formats listed in table 3.33; otherwise, the error INVALID_VALUE is generated. access specifies whether the texture bound to the image will be treated as READ_ONLY, WRITE_ONLY, or READ_WRITE. If a shader reads from an image unit with a texture bound as WRITE_ONLY, or writes to an image unit with a texture bound as READ_ONLY, the results of that shader operation are undefined and may lead to application termination. If a texture object bound to one or more image units is deleted by DeleteTextures, it is detached from each such image unit, as though BindImageTexture were called with unit identifying the image unit and texture set to zero. When a shader accesses the texture bound to an image unit using a built-in image load, store, or atomic function, it identifies a single texel by providing a one-, two-, or three-dimensional coordinate. Multisample texture accesses also specify a sample number. A coordinate vector is mapped to an individual texel τ i , τ ij , or τ ijk according to the target of the texture bound to the image unit using table 3.32. As noted above, single-layer bindings of array or cube map textures are considered to use a texture target corresponding to the bound layer, rather than that of the full texture. If the texture target has layers or cube map faces, the layer or face number is taken from the layer argument of BindImageTexture if the texture is bound with layered set to FALSE, or from the coordinate identified by table 3.32 otherwise. For cube map and cube map array textures with layered set to TRUE, the coordinate is mapped to a layer and face in the same manner as the layer argument of BindImageTexture. If the individual texel identified for an image load, store, or atomic operation doesn’t exist, the access is treated as invalid. Invalid image loads will return zero. Invalid image stores will have no effect. Invalid image atomics will not update any texture bound to the image unit and will return zero. An access is considered invalid if: • no texture is bound to the selected image unit; OpenGL 4.2 (Compatibility Profile) - April 27, 2012
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The OpenGL R○ Graphics System: A
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Contents 1 Introduction 1 1.1 Forma
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CONTENTS iii 2.14.14 Required State
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CONTENTS v 3.11 Color Sum . . . . .
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CONTENTS vii A Invariance 588 A.1 R
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CONTENTS ix L Version 4.2 659 L.1 N
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CONTENTS xi M.3.70 BPTC texture com
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LIST OF FIGURES xiii 3.11 Example o
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LIST OF TABLES xv 3.10 UNSIGNED_SHO
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LIST OF TABLES xvii 6.29 Pixel Oper
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Chapter 1 Introduction This documen
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1.5. OUR VIEW 3 the CPU and the gra
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Chapter 2 OpenGL Operation 2.1 Open
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2.1. OPENGL FUNDAMENTALS 7 section
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2.1. OPENGL FUNDAMENTALS 9 must not
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2.1. OPENGL FUNDAMENTALS 11 2.1.2 F
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2.3. GL COMMAND SYNTAX 13 describe
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2.3. GL COMMAND SYNTAX 15 indicates
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2.4. BASIC GL OPERATION 17 Transfor
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2.6. BEGIN/END PARADIGM 19 To allow
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2.6. BEGIN/END PARADIGM 21 Vertex C
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2.6. BEGIN/END PARADIGM 23 2.6.1 Be
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2.6. BEGIN/END PARADIGM 25 vertex A
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2.6. BEGIN/END PARADIGM 27 Figure 2
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2.6. BEGIN/END PARADIGM 29 Primitiv
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2.7. VERTEX SPECIFICATION 31 that i
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2.7. VERTEX SPECIFICATION 33 The Te
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2.7. VERTEX SPECIFICATION 35 The Co
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2.7. VERTEX SPECIFICATION 37 When v
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2.8. VERTEX ARRAYS 39 indicates the
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2.8. VERTEX ARRAYS 41 integer value
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2.8. VERTEX ARRAYS 43 does not exis
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2.8. VERTEX ARRAYS 45 and void Enab
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2.8. VERTEX ARRAYS 47 array is enab
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2.8. VERTEX ARRAYS 49 if (mode or p
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2.8. VERTEX ARRAYS 51 The command v
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2.8. VERTEX ARRAYS 53 if (no elemen
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2.8. VERTEX ARRAYS 55 format e t e
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2.9. BUFFER OBJECTS 57 Target name
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2.9. BUFFER OBJECTS 59 Each target
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2.9. BUFFER OBJECTS 61 Name Value B
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2.9. BUFFER OBJECTS 63 Name Value B
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2.9. BUFFER OBJECTS 65 FlushMappedB
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2.9. BUFFER OBJECTS 67 that GL impl
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2.10. VERTEX ARRAY OBJECTS 69 2.10
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2.12. FIXED-FUNCTION VERTEX TRANSFO
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2.13. FIXED-FUNCTION VERTEX LIGHTIN
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2.14. VERTEX SHADERS 93 shader, its
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2.14. VERTEX SHADERS 95 If shader i
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2.14. VERTEX SHADERS 97 • One or
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2.14. VERTEX SHADERS 99 any stage.
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2.14. VERTEX SHADERS 101 2.14.4 Pro
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2.14. VERTEX SHADERS 103 been previ
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2.14. VERTEX SHADERS 105 • For ea
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2.14. VERTEX SHADERS 107 • Six un
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2.14. VERTEX SHADERS 109 gram execu
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2.14. VERTEX SHADERS 111 values are
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2.14. VERTEX SHADERS 113 Built-in a
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2.14. VERTEX SHADERS 115 When a pro
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2.14. VERTEX SHADERS 117 void GetAc
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2.14. VERTEX SHADERS 119 bufferInde
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2.14. VERTEX SHADERS 121 program is
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2.14. VERTEX SHADERS 123 OpenGL Sha
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2.14. VERTEX SHADERS 125 OpenGL Sha
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2.14. VERTEX SHADERS 127 ments in t
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2.14. VERTEX SHADERS 129 The Unifor
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2.14. VERTEX SHADERS 131 void Progr
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2.14. VERTEX SHADERS 133 • Arrays
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2.14. VERTEX SHADERS 135 with targe
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2.14. VERTEX SHADERS 137 Each of a
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2.14. VERTEX SHADERS 139 is returne
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2.14. VERTEX SHADERS 141 2.14.10 Im
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2.14. VERTEX SHADERS 143 void Trans
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2.14. VERTEX SHADERS 145 INVALID_OP
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2.14. VERTEX SHADERS 147 The follow
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2.14. VERTEX SHADERS 149 Texture Si
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2.14. VERTEX SHADERS 151 dent const
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2.14. VERTEX SHADERS 153 as describ
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2.14. VERTEX SHADERS 155 Separable
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2.14. VERTEX SHADERS 157 invocation
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2.14. VERTEX SHADERS 159 • COMMAN
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2.14. VERTEX SHADERS 161 • Data w
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2.15. TESSELLATION 163 2.15 Tessell
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2.15. TESSELLATION 165 Tessellation
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2.15. TESSELLATION 167 Similarly to
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2.15. TESSELLATION 169 nent count.
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2.15. TESSELLATION 171 Figure 2.13.
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2.15. TESSELLATION 173 along each t
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2.15. TESSELLATION 175 ermost inner
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2.15. TESSELLATION 181 variables th
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2.15. TESSELLATION 183 Additionally
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2.16. GEOMETRY SHADERS 185 executed
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2.16. GEOMETRY SHADERS 187 forms an
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2.16. GEOMETRY SHADERS 189 subseque
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2.16. GEOMETRY SHADERS 191 The Open
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2.16. GEOMETRY SHADERS 193 rays. Th
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2.17. COORDINATE TRANSFORMATIONS 19
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2.18. ASYNCHRONOUS QUERIES 197 The
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2.18. ASYNCHRONOUS QUERIES 199 the
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2.20. TRANSFORM FEEDBACK 201 the GL
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2.20. TRANSFORM FEEDBACK 203 object
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2.20. TRANSFORM FEEDBACK 205 the ge
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2.20. TRANSFORM FEEDBACK 207 and th
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2.22. FLATSHADING 209 stream index
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2.23. PRIMITIVE CLIPPING 211 void S
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2.23. PRIMITIVE CLIPPING 213 If the
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2.25. CURRENT RASTER POSITION 215 I
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2.25. CURRENT RASTER POSITION 217 R
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Chapter 3 Rasterization Rasterizati
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3.1. DISCARDING PRIMITIVES BEFORE R
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3.3. ANTIALIASING 223 3. The sum of
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3.4. POINTS 225 any other variables
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3.4. POINTS 227 and the fade factor
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¡ ¡ ¡ ¡ ¡ ¡ 3.4. POINTS 229 5
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3.4. POINTS 231 All fragments produ
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3.5. LINE SEGMENTS 233 3.5 Line Seg
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3.5. LINE SEGMENTS 235 top or both
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3.5. LINE SEGMENTS 237 width = 2 wi
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3.6. POLYGONS 239 In addition, duri
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3.6. POLYGONS 241 such a case we re
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3.6. POLYGONS 243 3.6.3 Antialiasin
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3.6. POLYGONS 245 The offset value
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3.7. PIXEL RECTANGLES 247 Parameter
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3.7. PIXEL RECTANGLES 249 Parameter
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3.7. PIXEL RECTANGLES 251 Table Nam
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3.7. PIXEL RECTANGLES 253 width are
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3.7. PIXEL RECTANGLES 255 The red,
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3.7. PIXEL RECTANGLES 257 meanings,
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3.7. PIXEL RECTANGLES 259 the flag.
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3.7. PIXEL RECTANGLES 261 width and
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3.7. PIXEL RECTANGLES 263 Format Na
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3.7. PIXEL RECTANGLES 265 ROW_LENGT
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3.7. PIXEL RECTANGLES 267 UNSIGNED_
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3.7. PIXEL RECTANGLES 269 UNSIGNED_
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3.7. PIXEL RECTANGLES 271 Format Fi
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3.7. PIXEL RECTANGLES 273 void Draw
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3.7. PIXEL RECTANGLES 275 A fragmen
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3.7. PIXEL RECTANGLES 277 Base Inte
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3.7. PIXEL RECTANGLES 279 Base Filt
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3.7. PIXEL RECTANGLES 281 and C c i
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3.7. PIXEL RECTANGLES 283 ALPHA_BIA
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3.8. BITMAPS 285 ignored.) If a par
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3.9. EARLY PER-FRAGMENT TESTS 287 B
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3.10. TEXTURING 289 cube map array
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3.10. TEXTURING 291 returns n previ
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3.10. TEXTURING 293 3.10.2 Sampler
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3.10. TEXTURING 295 An INVALID_ENUM
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3.10. TEXTURING 297 Base Internal F
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3.10. TEXTURING 299 RGB10_A2UI, RGB
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3.10. TEXTURING 301 Sized internal
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3.10. TEXTURING 303 Sized Base A L
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3.10. TEXTURING 305 Compressed Inte
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3.10. TEXTURING 307 for image array
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3.10. TEXTURING 309 When target is
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Page 389 and 390: 3.11. COLOR SUM 369 Texel sizes, co
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4.2. WHOLE FRAMEBUFFER OPERATIONS 4
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4.3. DRAWING, READING, AND COPYING
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4.4. FRAMEBUFFER OBJECTS 429 4.4.1
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4.4. FRAMEBUFFER OBJECTS 431 • If
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4.4. FRAMEBUFFER OBJECTS 433 with t
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4.4. FRAMEBUFFER OBJECTS 435 Sized
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4.4. FRAMEBUFFER OBJECTS 437 Attach
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4.4. FRAMEBUFFER OBJECTS 439 operat
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4.4. FRAMEBUFFER OBJECTS 441 Render
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4.4. FRAMEBUFFER OBJECTS 443 4.4.4
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4.4. FRAMEBUFFER OBJECTS 445 • Th
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4.4. FRAMEBUFFER OBJECTS 447 Otherw
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4.4. FRAMEBUFFER OBJECTS 449 corres
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4.4. FRAMEBUFFER OBJECTS 451 When c
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5.1. EVALUATORS 453 target k Values
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5.1. EVALUATORS 455 void EvalCoord{
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5.1. EVALUATORS 457 for i = q 1 to
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5.2. SELECTION 459 LoadName replace
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5.3. FEEDBACK 461 buffer is a point
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5.4. TIMER QUERIES 463 feedback-lis
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5.5. DISPLAY LISTS 465 pointers whi
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5.5. DISPLAY LISTS 467 the effect o
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5.6. FLUSH AND FINISH 469 setting;
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5.7. SYNC OBJECTS AND FENCES 471 vo
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5.8. HINTS 473 See appendix D.2 for
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Chapter 6 State and State Requests
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6.1. QUERYING GL STATE 477 that mas
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6.1. QUERYING GL STATE 479 data is
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6.1. QUERYING GL STATE 481 turned s
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6.1. QUERYING GL STATE 483 Base Int
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6.1. QUERYING GL STATE 485 INVALID_
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6.1. QUERYING GL STATE 487 type Nam
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6.1. QUERYING GL STATE 489 If reset
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6.1. QUERYING GL STATE 491 Value CO
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6.1. QUERYING GL STATE 493 For occl
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6.1. QUERYING GL STATE 495 returns
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6.1. QUERYING GL STATE 497 COUNTER_
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6.1. QUERYING GL STATE 499 If pname
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6.1. QUERYING GL STATE 503 of this
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6.1. QUERYING GL STATE 505 void Get
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6.1. QUERYING GL STATE 507 generate
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6.1. QUERYING GL STATE 511 take a b
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6.2. STATE TABLES 513 state variabl
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6.2. STATE TABLES 515 OLD NEW Get v
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6.2. STATE TABLES 517 Get value Typ
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6.2. STATE TABLES 525 Get Command I
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6.2. STATE TABLES 547 Get Command I
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6.2. STATE TABLES 573 Get Command M
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A.2. MULTI-PASS ALGORITHMS 589 A.2
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A.3. INVARIANCE RULES 591 Rule 3 Th
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A.4. TESSELLATION INVARIANCE 593 if
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A.6. WHAT ALL THIS MEANS 595 Becaus
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597 stencil comparison function; it
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Appendix C Compressed Texture Image
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C.1. RGTC COMPRESSED TEXTURE IMAGE
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C.2. BPTC COMPRESSED TEXTURE IMAGE
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D.1. OBJECT DELETION BEHAVIOR 615 m
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D.3. PROPAGATING CHANGES TO OBJECTS
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D.3. PROPAGATING CHANGES TO OBJECTS
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E.1. CORE AND COMPATIBILITY PROFILE
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E.2. DEPRECATED AND REMOVED FEATURE
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E.2. DEPRECATED AND REMOVED FEATURE
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Appendix F Version 3.0 and Before O
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F.3. CHANGED TOKENS 629 New Token N
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F.5. CREDITS AND ACKNOWLEDGEMENTS 6
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F.5. CREDITS AND ACKNOWLEDGEMENTS 6
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G.2. DEPRECATION MODEL 635 state ha
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G.4. CREDITS AND ACKNOWLEDGEMENTS 6
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Appendix H Version 3.2 OpenGL versi
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H.4. CHANGE LOG 641 New Token Name
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H.5. CREDITS AND ACKNOWLEDGEMENTS 6
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H.5. CREDITS AND ACKNOWLEDGEMENTS 6
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I.2. DEPRECATION MODEL 647 ing fact
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I.4. CREDITS AND ACKNOWLEDGEMENTS 6
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J.1. NEW FEATURES 651 • Mechanism
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J.4. CREDITS AND ACKNOWLEDGEMENTS 6
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Appendix K Version 4.1 OpenGL versi
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K.5. CREDITS AND ACKNOWLEDGEMENTS 6
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Appendix L Version 4.2 OpenGL versi
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L.4. CHANGE LOG 661 New Token Name
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L.4. CHANGE LOG 663 GetActiveUnifor
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L.4. CHANGE LOG 665 • Clean up de
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L.4. CHANGE LOG 667 • Minor bugfi
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L.5. CREDITS AND ACKNOWLEDGEMENTS 6
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Appendix M Extension Registry, Head
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M.3. ARB EXTENSIONS 673 M.3.2 be am
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M.3. ARB EXTENSIONS 675 M.3.13 Text
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M.3. ARB EXTENSIONS 677 M.3.28 Open
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M.3. ARB EXTENSIONS 679 The name st
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M.3. ARB EXTENSIONS 681 equivalent
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M.3. ARB EXTENSIONS 683 M.3.59 Seam
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M.3. ARB EXTENSIONS 685 M.3.70 BPTC
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M.3. ARB EXTENSIONS 687 M.3.83 Shad
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M.3. ARB EXTENSIONS 689 M.3.96 Debu
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M.3. ARB EXTENSIONS 691 M.3.108 Sha
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INDEX 693 BUFFERS, 500 ActiveShader
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INDEX 695 BLEND, 351, 354, 394, 400
Page 717 and 718:
INDEX 697 COLOR MATERIAL, 87, 90, 5
Page 719 and 720:
INDEX 699 CopyConvolutionFilter*, 4
Page 721 and 722:
INDEX 701 DOUBLE VEC3, 123 DOUBLE V
Page 723 and 724:
INDEX 703 FLOAT, 39, 44, 54-56, 122
Page 725 and 726:
INDEX 705 GenSamplers, 293-295, 467
Page 727 and 728:
INDEX 707 GetTexLevelParameter, 479
Page 729 and 730:
INDEX 709 GL ARB texture swizzle, 6
Page 731 and 732:
INDEX 711 iimage2DArray, 126 iimage
Page 733 and 734:
INDEX 713 313-315, 317, 318, 321, 3
Page 735 and 736:
INDEX 715 MAP1 TEXTURE COORD 3, 453
Page 737 and 738:
INDEX 717 MAX GEOMETRY UNIFORM - BL
Page 739 and 740:
INDEX 719 GATHER OFFSET, 333, 577 M
Page 741 and 742:
INDEX 721 PIXEL MAP B TO B, 250, 27
Page 743 and 744:
INDEX 723 PROXY POST COLOR MATRIX -
Page 745 and 746:
INDEX 725 rg16 snorm, 366 RG16F, 29
Page 747 and 748:
INDEX 727 SamplerParameterI{i ui}v,
Page 749 and 750:
INDEX 729 T, 78, 478 T2F C3F V3F, 5
Page 751 and 752:
INDEX 731 TEXTURE COORD ARRAY - POI
Page 753 and 754:
INDEX 733 PAUSED, 565, 661, 662 TRA
Page 755 and 756:
INDEX 735 UNPACK SKIP PIXELS, 247,
Page 757 and 758:
INDEX 737 VERTEX ATTRIB ARRAY NOR-
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OpenGL 4.2 (Compatibility Profile) - April 27, 2012

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