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C.2. BPTC COMPRESSED TEXTURE IMAGE FORMATS 596 Interpolation is always performed using a 6-bit interpolation factor. The effective interpolation factors for 2, 3, and 4 bit indices are given below: 2 0, 21, 43, 64 3 0, 9, 18, 27, 37, 46, 55, 64 4 0, 4, 9, 13, 17, 21, 26, 30, 34, 38, 43, 47, 51, 55, 60, 64 The interpolation results in an RGBA color. If rotation bits are present, this color is remapped according to: 0 no change 1 swap(a,r) 2 swap(a,g) 3 swap(a,b) These 8-bit values show up in the shader interpreted as either RGBA8 or SRGB8_ALPHA8 for COMPRESSED_RGBA_BPTC_UNORM and COMPRESSED_- SRGB_ALPHA_BPTC_UNORM respectively. C.2.2 Formats COMPRESSED_RGB_BPTC_SIGNED_FLOAT and COMPRESSED_RGB_BPTC_UNSIGNED_FLOAT Each 4×4 block of texels consists of 128 bits of RGB data. These formats are very similar and will be described together. In the description and pseudocode below, signed will be used as a condition which is true for the SIGNED format and false for the UNSIGNED format. Both formats only contain RGB data, so the returned alpha value is 1.0. If a block uses a reserved or invalid encoding, the return value is (0, 0, 0, 1). Each block can contain data in one of 14 modes. The mode number is encoded in either the low two bits or the low five bits. If the low two bits are less than two, that is the mode number, otherwise the low five bits the mode number. Mode numbers not listed in table C.7 are reserved (19, 23, 27, and 31). The data for the compressed blocks is stored in a different format for each mode. The formats are specified in table C.8. The format strings are intended to be read from left to right with the LSB on the left. Each element is of the form v[a : b]. If a ≥ b, this indicates extracting b − a + 1 bits from the block at that location and put them in the corresponding bits of the variable v. If a < b, then OpenGL 4.2 (Compatibility Profile) - August 22, 2011
C.2. BPTC COMPRESSED TEXTURE IMAGE FORMATS 597 Mode NS PB RB ISB CB AB EPB SPB IB IB2 0 3 4 0 0 4 0 1 0 3 0 1 2 6 0 0 6 0 0 1 3 0 2 3 6 0 0 5 0 0 0 2 0 3 2 6 0 0 7 0 1 0 2 0 4 1 0 2 1 5 6 0 0 2 3 5 1 0 2 0 7 8 0 0 2 2 6 1 0 0 0 7 7 1 0 4 0 7 2 6 0 0 5 5 1 0 2 0 Table C.1: Mode-dependent BPTC parameters. The full descriptions of each column are as follows: Mode: As described previously NS: Number of subsets in each partition PB: Partition bits RB: Rotation bits ISB: Index selection bits CB: Color bits AB: Alpha bits EPB: Endpoint P-bits SPB: Shared P-bits IB: Index bits per element IB2: Secondary index bits per element OpenGL 4.2 (Compatibility Profile) - August 22, 2011
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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 2.15 Tessellation . .
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CONTENTS v 3.12 Fog . . . . . . . .
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CONTENTS vii A Invariance 579 A.1 R
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CONTENTS ix L Version 4.2 649 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 available to the us
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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 Display
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2.6. BEGIN/END PARADIGM 19 Table 2.
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2.6. BEGIN/END PARADIGM 21 Vertex C
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2.6. BEGIN/END PARADIGM 23 drawn us
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2.6. BEGIN/END PARADIGM 25 2 4 6 2
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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 to cha
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2.7. VERTEX SPECIFICATION 33 This c
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2.7. VERTEX SPECIFICATION 35 void C
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2.7. VERTEX SPECIFICATION 37 • si
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2.8. VERTEX ARRAYS 39 void VertexAt
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2.8. VERTEX ARRAYS 41 The index par
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2.8. VERTEX ARRAYS 43 void ArrayEle
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2.8. VERTEX ARRAYS 45 and Primitive
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2.8. VERTEX ARRAYS 47 not modified
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2.8. VERTEX ARRAYS 49 if (mode is i
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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 in the array
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2.9. BUFFER OBJECTS 61 If the GL is
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2.9. BUFFER OBJECTS 63 Name Value B
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2.9. BUFFER OBJECTS 65 Unmapping Bu
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2.9. BUFFER OBJECTS 67 binding corr
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2.11. RECTANGLES 69 void GenVertexA
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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 subsequent
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2.14. VERTEX SHADERS 101 Program pi
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2.14. VERTEX SHADERS 103 such a nam
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2.14. VERTEX SHADERS 105 • the in
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2.14. VERTEX SHADERS 107 LINK_STATU
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2.14. VERTEX SHADERS 109 Data type
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2.14. VERTEX SHADERS 111 This comma
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2.14. VERTEX SHADERS 113 the unifor
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2.14. VERTEX SHADERS 115 program is
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2.14. VERTEX SHADERS 117 control, t
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2.14. VERTEX SHADERS 119 active uni
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2.14. VERTEX SHADERS 121 Type Name
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2.14. VERTEX SHADERS 123 OpenGL Sha
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2.14. VERTEX SHADERS 125 For GetAct
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2.14. VERTEX SHADERS 127 The Unifor
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2.14. VERTEX SHADERS 129 void Progr
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2.14. VERTEX SHADERS 131 consecutiv
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2.14. VERTEX SHADERS 133 Uniform Bu
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2.14. VERTEX SHADERS 135 The number
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2.14. VERTEX SHADERS 137 subroutine
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2.14. VERTEX SHADERS 139 gram comma
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2.14. VERTEX SHADERS 141 recorded a
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2.14. VERTEX SHADERS 143 void GetTr
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2.14. VERTEX SHADERS 145 • If the
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2.14. VERTEX SHADERS 147 • the te
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2.14. VERTEX SHADERS 149 • The sa
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2.14. VERTEX SHADERS 151 The built-
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2.14. VERTEX SHADERS 153 results wr
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2.14. VERTEX SHADERS 155 a previous
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2.14. VERTEX SHADERS 157 • TEXTUR
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2.14. VERTEX SHADERS 159 • Data w
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2.15. TESSELLATION 161 • For each
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2.15. TESSELLATION 163 invocation m
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2.15. TESSELLATION 165 • The vari
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2.15. TESSELLATION 167 output varia
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2.15. TESSELLATION 169 Figure 2.13.
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2.15. TESSELLATION 171 Triangle Tes
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2.15. TESSELLATION 173 each triangl
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2.15. TESSELLATION 179 variables th
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2.15. TESSELLATION 181 Additionally
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2.16. GEOMETRY SHADERS 183 executed
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2.16. GEOMETRY SHADERS 185 accessed
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2.16. GEOMETRY SHADERS 187 Geometry
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2.16. GEOMETRY SHADERS 189 declared
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2.16. GEOMETRY SHADERS 191 of a cub
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2.17. COORDINATE TRANSFORMATIONS 19
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2.18. ASYNCHRONOUS QUERIES 195 The
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2.18. ASYNCHRONOUS QUERIES 197 the
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2.20. TRANSFORM FEEDBACK 199 an exi
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2.20. TRANSFORM FEEDBACK 201 BindTr
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2.20. TRANSFORM FEEDBACK 203 object
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2.20. TRANSFORM FEEDBACK 205 • by
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2.22. FLATSHADING 207 When BeginQue
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2.23. PRIMITIVE CLIPPING 209 gl_Bac
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2.23. PRIMITIVE CLIPPING 211 DEPTH_
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2.24. FINAL COLOR PROCESSING 213 2.
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2.25. CURRENT RASTER POSITION 215 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 221 In some imple
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3.4. POINTS 223 rasterization, beca
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3.4. POINTS 225 void PointParameter
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3.4. POINTS 227 6.0 5.0 4.0 3.0 2.0
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3.4. POINTS 229 where size is the p
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¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦ ¦
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3.5. LINE SEGMENTS 233 Line Stipple
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3.5. LINE SEGMENTS 235 Figure 3.6.
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3.6. POLYGONS 237 3.6.1 Basic Polyg
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3.6. POLYGONS 239 For a polygon wit
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3.6. POLYGONS 241 3.6.5 Depth Offse
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3.7. PIXEL RECTANGLES 243 polygon r
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3.7. PIXEL RECTANGLES 245 3.7.2 The
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3.7. PIXEL RECTANGLES 247 Map Name
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3.7. PIXEL RECTANGLES 249 The color
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3.7. PIXEL RECTANGLES 251 In additi
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3.7. PIXEL RECTANGLES 253 Special f
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3.7. PIXEL RECTANGLES 255 Histogram
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¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡
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3.7. PIXEL RECTANGLES 259 type Para
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3.7. PIXEL RECTANGLES 261 Element S
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3.7. PIXEL RECTANGLES 263 type Para
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3.7. PIXEL RECTANGLES 265 UNSIGNED_
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3.7. PIXEL RECTANGLES 267 FLOAT_32_
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3.7. PIXEL RECTANGLES 269 Conversio
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3.7. PIXEL RECTANGLES 271 For integ
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3.7. PIXEL RECTANGLES 273 Arithmeti
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3.7. PIXEL RECTANGLES 275 The inter
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3.7. PIXEL RECTANGLES 277 Border Mo
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3.7. PIXEL RECTANGLES 279 where C[i
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3.7. PIXEL RECTANGLES 281 B i and A
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¡ ¡ ¡ ¡ ¡ ¡ 3.8. BITMAPS 283
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3.10. TEXTURING 285 not be performe
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3.10. TEXTURING 287 The active text
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3.10. TEXTURING 289 FALSE is return
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3.10. TEXTURING 291 The currently b
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3.10. TEXTURING 293 The selected gr
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3.10. TEXTURING 295 might not suppo
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3.10. TEXTURING 297 exp p = max(−
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3.10. TEXTURING 299 Sized internal
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3.10. TEXTURING 301 Sized Base D S
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3.10. TEXTURING 303 When target is
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3.10. TEXTURING 305 TEXTURE_CUBE_MA
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3.10. TEXTURING 307 1.0 5.0 4 3 t v
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3.10. TEXTURING 309 Subsequent proc
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3.10. TEXTURING 311 components is c
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3.10. TEXTURING 313 result in an IN
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3.10. TEXTURING 315 storage modes c
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3.10. TEXTURING 317 • data points
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3.10. TEXTURING 319 FORMAT, and TEX
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3.10. TEXTURING 321 3.10.7 Buffer T
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3.10. TEXTURING 323 Internal format
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3.10. TEXTURING 325 Texture paramet
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3.10. TEXTURING 327 Major Axis Dire
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3.10. TEXTURING 329 bias texobj is
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3.10. TEXTURING 331 Coordinate Wrap
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3.10. TEXTURING 333 i 0 = wrap(⌊u
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3.10. TEXTURING 335 section 3.10.17
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3.10. TEXTURING 337 otherwise p =
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3.10. TEXTURING 339 level base arra
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3.10. TEXTURING 341 Effects of Samp
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3.10. TEXTURING 343 dimensional, re
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3.10. TEXTURING 345 for (i = 0; i <
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3.10. TEXTURING 347 } width = max(1
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3.10. TEXTURING 349 Texture Base Te
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3.10. TEXTURING 351 If the value of
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3.10. TEXTURING 353 SRCn_RGB OPERAN
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3.10. TEXTURING 355 Texture Compari
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3.10. TEXTURING 357 the second text
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3.10. TEXTURING 359 to image unit u
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3.10. TEXTURING 361 invalid if: •
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3.10. TEXTURING 363 Supported image
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3.10. TEXTURING 365 Texel sizes, co
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3.12. FOG 367 This factor f is comp
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3.13. FRAGMENT SHADERS 369 fragment
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3.13. FRAGMENT SHADERS 371 • Fog
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3.13. FRAGMENT SHADERS 373 version
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3.13. FRAGMENT SHADERS 375 defined
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3.13. FRAGMENT SHADERS 377 Such bin
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Chapter 4 Per-Fragment Operations a
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4.1. PER-FRAGMENT OPERATIONS 381 Fr
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4.1. PER-FRAGMENT OPERATIONS 383 st
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4.1. PER-FRAGMENT OPERATIONS 385 pr
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4.1. PER-FRAGMENT OPERATIONS 387 St
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4.1. PER-FRAGMENT OPERATIONS 389 Be
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4.1. PER-FRAGMENT OPERATIONS 391 dr
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4.1. PER-FRAGMENT OPERATIONS 393 vo
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4.1. PER-FRAGMENT OPERATIONS 395 Th
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4.1. PER-FRAGMENT OPERATIONS 397 to
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4.2. WHOLE FRAMEBUFFER OPERATIONS 3
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¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡
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4.3. DRAWING, READING, AND COPYING
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4.4. FRAMEBUFFER OBJECTS 425 with t
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4.4. FRAMEBUFFER OBJECTS 427 If a f
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4.4. FRAMEBUFFER OBJECTS 429 BindRe
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4.4. FRAMEBUFFER OBJECTS 431 that t
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4.4. FRAMEBUFFER OBJECTS 433 or if
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4.4. FRAMEBUFFER OBJECTS 435 The re
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4.4. FRAMEBUFFER OBJECTS 437 • th
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4.4. FRAMEBUFFER OBJECTS 439 • An
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4.4. FRAMEBUFFER OBJECTS 441 of the
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4.4. FRAMEBUFFER OBJECTS 443 Effect
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4.4. FRAMEBUFFER OBJECTS 445 Conver
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Chapter 5 Special Functions This ch
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5.1. EVALUATORS 449 Integers Reals
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5.1. EVALUATORS 451 The second way
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5.2. SELECTION 453 EvalCoord2(p *
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5.3. FEEDBACK 455 of each primitive
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5.4. TIMER QUERIES 457 Type coordin
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5.5. DISPLAY LISTS 459 started or s
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5.5. DISPLAY LISTS 461 SHORT, UNSIG
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5.5. DISPLAY LISTS 463 Program and
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5.7. SYNC OBJECTS AND FENCES 465 Pr
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5.7. SYNC OBJECTS AND FENCES 467 vo
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5.8. HINTS 469 Target PERSPECTIVE_C
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6.1. QUERYING GL STATE 471 void Get
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6.1. QUERYING GL STATE 473 6.1.3 En
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6.1. QUERYING GL STATE 475 target m
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6.1. QUERYING GL STATE 477 • form
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6.1. QUERYING GL STATE 479 When the
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6.1. QUERYING GL STATE 481 format N
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6.1. QUERYING GL STATE 483 target m
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6.1. QUERYING GL STATE 485 resets a
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6.1. QUERYING GL STATE 487 names, a
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6.1. QUERYING GL STATE 489 If multi
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6.1. QUERYING GL STATE 491 To query
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6.1. QUERYING GL STATE 493 If pname
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6.1. QUERYING GL STATE 495 If pname
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6.1. QUERYING GL STATE 497 is a pro
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6.1. QUERYING GL STATE 499 command
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6.1. QUERYING GL STATE 501 void Get
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6.1. QUERYING GL STATE 503 • If p
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6.1. QUERYING GL STATE 505 An INVAL
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6.2. STATE TABLES 507 the attribute
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6.2. STATE TABLES 509 Type code Exp
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6.2. STATE TABLES 511 Get value Typ
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Page 565 and 566: 6.2. STATE TABLES 545 Get value Typ
Page 569 and 570: 6.2. STATE TABLES 549 Get Command I
Page 585 and 586: 6.2. STATE TABLES 565 Get Command M
Page 587 and 588: 6.2. STATE TABLES 567 Get Command M
Page 599 and 600: Appendix A Invariance The OpenGL sp
Page 601 and 602: A.3. INVARIANCE RULES 581 • Sciss
Page 603 and 604: A.4. TESSELLATION INVARIANCE 583
Page 605 and 606: A.5. ATOMIC COUNTER INVARIANCE 585
Page 607 and 608: Appendix B Corollaries The followin
Page 609 and 610: 589 16. ColorMaterial has no effect
Page 611 and 612: C.1. RGTC COMPRESSED TEXTURE IMAGE
Page 613 and 614: C.2. BPTC COMPRESSED TEXTURE IMAGE
Page 615: C.2. BPTC COMPRESSED TEXTURE IMAGE
Page 625 and 626: Appendix D Shared Objects and Multi
Page 627 and 628: D.2. SYNC OBJECTS AND MULTIPLE CONT
Page 629 and 630: D.3. PROPAGATING CHANGES TO OBJECTS
Page 631 and 632: E.1. CORE AND COMPATIBILITY PROFILE
Page 633 and 634: E.2. DEPRECATED AND REMOVED FEATURE
Page 635 and 636: E.2. DEPRECATED AND REMOVED FEATURE
Page 637 and 638: Appendix F Version 3.0 and Before O
Page 639 and 640: F.3. CHANGED TOKENS 619 New Token N
Page 641 and 642: F.5. CREDITS AND ACKNOWLEDGEMENTS 6
Page 643 and 644: F.5. CREDITS AND ACKNOWLEDGEMENTS 6
Page 645 and 646: G.2. DEPRECATION MODEL 625 state ha
Page 647 and 648: G.4. CREDITS AND ACKNOWLEDGEMENTS 6
Page 649 and 650: Appendix H Version 3.2 OpenGL versi
Page 651 and 652: H.4. CHANGE LOG 631 New Token Name
Page 653 and 654: H.5. CREDITS AND ACKNOWLEDGEMENTS 6
Page 655 and 656: H.5. CREDITS AND ACKNOWLEDGEMENTS 6
Page 657 and 658: I.2. DEPRECATION MODEL 637 ing fact
Page 659 and 660: I.4. CREDITS AND ACKNOWLEDGEMENTS 6
Page 661 and 662: J.1. NEW FEATURES 641 • Mechanism
Page 663 and 664: J.4. CREDITS AND ACKNOWLEDGEMENTS 6
Page 665 and 666: 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.5. CREDITS AND ACKNOWLEDGEMENTS 6
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Appendix M Extension Registry, Head
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M.3. ARB EXTENSIONS 655 M.3.2 be am
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M.3. ARB EXTENSIONS 657 M.3.13 Text
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M.3. ARB EXTENSIONS 659 M.3.28 Open
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M.3. ARB EXTENSIONS 661 The name st
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M.3. ARB EXTENSIONS 663 equivalent
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M.3. ARB EXTENSIONS 665 M.3.59 Seam
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M.3. ARB EXTENSIONS 667 The name st
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M.3. ARB EXTENSIONS 669 M.3.84 Tess
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M.3. ARB EXTENSIONS 671 M.3.97 Cont
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M.3. ARB EXTENSIONS 673 M.3.109 Tex
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INDEX 675 552 ACTIVE UNIFORM BLOCKS
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INDEX 677 BindSampler, 290, 292 Bin
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INDEX 679 COLOR TABLE BIAS, 248, 24
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INDEX 681 CreateProgram, 96, 463 Cr
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INDEX 683 DrawArraysInstanced, 48,
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INDEX 685 Flush, 463, 464, 468, 587
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INDEX 687 GetActiveAtomicCounterBuf
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INDEX 689 GetVertexAttribdv, 498, 4
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INDEX 691 GL ARB viewport array, 64
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INDEX 693 IMAGE 2D RECT, 123 IMAGE
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INDEX 695 512-514, 516, 518-525, 53
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INDEX 697 MapGrid1, 451 MapGrid2, 4
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INDEX 699 MAX SERVER WAIT TIMEOUT,
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INDEX 701 MultTransposeMatrix, 72,
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INDEX 703 POINT SIZE GRANULARITY, 5
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INDEX 705 Q, 78, 79, 473 QUAD STRIP
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INDEX 707 rgb10 a2ui, 362 RGB12, 29
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INDEX 709 SecondaryColor3, 34 Secon
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INDEX 711 TexCoord*1*, 33 TexCoord*
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INDEX 713 526 TEXTURE CUBE MAP POS-
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INDEX 715 triangles adjacency, 184
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INDEX 717 417 UNSIGNED INT 8 8 8 8,
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INDEX 719 VertexAttribI3i, 109 Vert
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