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4.2. WHOLE FRAMEBUFFER OPERATIONS 400 4.2.1 Selecting Buffers for Writing The first such operation is controlling the color buffers into which each of the fragment color values is written. This is accomplished with either DrawBuffer or DrawBuffers. The command void DrawBuffer( enum buf ); defines the set of color buffers to which fragment color zero is written. buf must be one of the values from tables 4.4 or 4.5. In addition, acceptable values for buf depend on whether the GL is using the default framebuffer (i.e., DRAW_FRAMEBUFFER_BINDING is zero), or a framebuffer object (i.e., DRAW_- FRAMEBUFFER_BINDING is non-zero). In the initial state, the GL is bound to the default framebuffer. For more information about framebuffer objects, see section 4.4. If the GL is bound to the default framebuffer, then buf must be one of the values listed in table 4.4, which summarizes the constants and the buffers they indicate. In this case, buf is a symbolic constant specifying zero, one, two, or four buffers for writing. These constants refer to the four potentially visible buffers (front left, front right, back left, and back right), and to the auxiliary buffers. Arguments other than AUXi that omit reference to LEFT or RIGHT refer to both left and right buffers. Arguments other than AUXi that omit reference to FRONT or BACK refer to both front and back buffers. AUXi enables drawing only to auxiliary buffer i. Each AUXi adheres to AUXi = AUX0 + i, and i must be in the range 0 to the value of AUX_BUFFERS minus one. If the GL is bound to the default framebuffer and DrawBuffer is supplied with a constant (other than NONE) that does not indicate any of the color buffers allocated to the GL context, the error INVALID_OPERATION results. If the GL is bound to a framebuffer object, buf must be one of the values listed in table 4.5, which summarizes the constants and the buffers they indicate. In this case, buf is a symbolic constant specifying a single color buffer for writing. Specifying COLOR_ATTACHMENTi enables drawing only to the image attached to the framebuffer at COLOR_ATTACHMENTi. Each COLOR_ATTACHMENTi adheres to COLOR_ATTACHMENTi = COLOR_ATTACHMENT0 + i. The initial value of DRAW_- BUFFER for framebuffer objects is COLOR_ATTACHMENT0. If the GL is bound to a framebuffer object and buf is one of the constants from table 4.4 (other than NONE), then the error INVALID_OPERATION results. If buf is COLOR_ATTACHMENTm and m is greater than or equal to the value of MAX_- COLOR_ATTACHMENTS, then the error INVALID_VALUE results. OpenGL 4.2 (Compatibility Profile) - August 22, 2011
4.2. WHOLE FRAMEBUFFER OPERATIONS 401 Symbolic Front Front Back Back Aux Constant Left Right Left Right i NONE FRONT_LEFT • FRONT_RIGHT • BACK_LEFT • BACK_RIGHT • FRONT • • BACK • • LEFT • • RIGHT • • FRONT_AND_BACK • • • • AUXi • Table 4.4: Arguments to DrawBuffer and ReadBuffer when the context is bound to a default framebuffer, and the buffers they indicate. If DrawBuffer is supplied with a constant that is legal for neither the default framebuffer nor a framebuffer object, then the error INVALID_ENUM results. DrawBuffer will set the draw buffer for fragment colors other than zero to NONE. The command void DrawBuffers( sizei n, const enum *bufs ); defines the draw buffers to which all fragment colors are written. n specifies the number of buffers in bufs. bufs is a pointer to an array of symbolic constants specifying the buffer to which each fragment color is written. Symbolic Constant NONE COLOR_ATTACHMENTi (see caption) Meaning No buffer Output fragment color to image attached at color attachment point i Table 4.5: Arguments to DrawBuffer(s) and ReadBuffer when the context is bound to a framebuffer object, and the buffers they indicate. i in COLOR_- ATTACHMENTi may range from zero to the value of MAX_COLOR_ATTACHMENTS - 1. 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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Page 469 and 470: 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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6.2. STATE TABLES 549 Get Command I
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6.2. STATE TABLES 565 Get Command M
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6.2. STATE TABLES 567 Get Command M
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Appendix A Invariance The OpenGL sp
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A.3. INVARIANCE RULES 581 • Sciss
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A.4. TESSELLATION INVARIANCE 583
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A.5. ATOMIC COUNTER INVARIANCE 585
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Appendix B Corollaries The followin
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589 16. ColorMaterial has no effect
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C.1. RGTC COMPRESSED TEXTURE IMAGE
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C.2. BPTC COMPRESSED TEXTURE IMAGE
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Appendix D Shared Objects and Multi
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D.2. SYNC OBJECTS AND MULTIPLE CONT
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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 619 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 625 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 631 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 637 ing fact
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I.4. CREDITS AND ACKNOWLEDGEMENTS 6
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J.1. NEW FEATURES 641 • 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.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
Page 727 and 728:
INDEX 707 rgb10 a2ui, 362 RGB12, 29
Page 729 and 730:
INDEX 709 SecondaryColor3, 34 Secon
Page 731 and 732:
INDEX 711 TexCoord*1*, 33 TexCoord*
Page 733 and 734:
INDEX 713 526 TEXTURE CUBE MAP POS-
Page 735 and 736:
INDEX 715 triangles adjacency, 184
Page 737 and 738:
INDEX 717 417 UNSIGNED INT 8 8 8 8,
Page 739:
INDEX 719 VertexAttribI3i, 109 Vert
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spec - OpenGL

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