OpenGL 4.1 (Compatibility Profile) - July 25, 2010

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2.15. TESSELLATION 148 The number of vertices in the output patch is fixed when the program is linked, and is specified in tessellation control shader source code using the output layout qualifier vertices, as described in the OpenGL Shading Language Specification. A program will fail to link if the output patch vertex count is not specified by any tessellation control shader object attached to the program, if it is specified differently by multiple tessellation control shader objects, if it is less than or equal to zero, or if it is greater than the implementation-dependent maximum patch size. The output patch vertex count may be queried by calling GetProgramiv with the symbolic constant TESS_CONTROL_OUTPUT_VERTICES. Tessellation control shaders are created as described in section 2.14.1, using a type of TESS_CONTROL_SHADER. When a new input patch is received, the tessellation control shader is run once for each vertex in the output patch. The tessellation control shader invocations collectively specify the per-vertex and per-patch attributes of the output patch. The per-vertex attributes are obtained from the pervertex output variables written by each invocation. Each tessellation control shader invocation may only write to per-vertex output variables corresponding to its own output patch vertex. The output patch vertex number corresponding to a given tessellation control point shader invocation is given by the built-in variable gl_- InvocationID. Per-patch attributes are taken from the per-patch output variables, which may be written by any tessellation control shader invocation. While tessellation control shader invocations may read any per-vertex and per-patch output variable and write any per-patch output variable, reading or writing output variables also written by other invocations has ordering hazards discussed below. Tessellation Control Shader Variables Tessellation control shaders can access uniforms belonging to the current program object. The amount of storage available for uniform variables in the default uniform block accessed by a tessellation control shader is specified by the value of the implementation-dependent constant MAX_TESS_CONTROL_- UNIFORM_COMPONENTS. The total amount of combined storage available for uniform variables in all uniform blocks accessed by a tessellation control shader (including the default uniform block) is specified by the value of the implementationdependent constant MAX_COMBINED_TESS_CONTROL_UNIFORM_COMPONENTS. These values represent the numbers of individual floating-point, integer, or boolean values that can be held in uniform variable storage for a tessellation evaluation shader. A link error is generated if an attempt is made to utilize more than the space available for tessellation control shader uniform variables. Uniforms are manipulated as described in section 2.14.7. Tessellation control shaders also have access to samplers to perform texturing operations, as described in section 2.14.9. OpenGL 4.1 (Compatibility Profile) - July 25, 2010
2.15. TESSELLATION 149 Tessellation control shaders can access the transformed attributes of all vertices for their input primitive using input variables. A vertex shader writing to output variables generates the values of these input varying variables, including values for built-in as well as user-defined varying variables. Values for any varying variables that are not written by a vertex shader are undefined. Additionally, tessellation control shaders can write to one or more output variables, including per-vertex attributes for the vertices of the output patch and perpatch attributes of the patch. Tessellation control shaders can also write to a set of built-in per-vertex and per-patch outputs defined in the OpenGL Shading Language. The per-vertex and per-patch attributes of the output patch are used by the tessellation primitive generator (section 2.15.2) and may be read by tessellation evaluation shader (section 2.15.3). Tessellation Control Shader Execution Environment If there is an active program for the tessellation control stage, the executable version of the program’s tessellation control shader is used to process patches resulting from the primitive assembly stage. When tessellation control shader execution completes, the input patch is consumed. A new patch is assembled from the per-vertex and per-patch output variables written by the shader and is passed to subsequent pipeline stages. There are several special considerations for tessellation control shader execution described in the following sections. Texture Access The Shader-Only Texturing subsection of section 2.14.11 describes texture lookup functionality accessible to a vertex shader. The texel fetch and texture size query functionality described there also applies to tessellation control shaders. Tessellation Control Shader Inputs Section 7.1 of the OpenGL Shading Language Specification describes the builtin variable array gl_in available as input to a tessellation control shader. gl_- in receives values from equivalent built-in output variables written by the vertex shader (section 2.14.11). Each array element of gl_in is a structure holding values for a specific vertex of the input patch. The length of gl_in is equal to the implementation-dependent maximum patch size (gl_MaxPatchVertices). Behavior is undefined if gl_in is indexed with a vertex index greater than or equal to the current patch size. The members of each element of the OpenGL 4.1 (Compatibility Profile) - July 25, 2010
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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 2.15.2 Tessellation Pr
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CONTENTS v 3.14 Multisample Point F
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CONTENTS vii B Corollaries 548 C Co
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CONTENTS ix L.3.11 Vertex Blend . .
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CONTENTS xi L.3.91 Shader Precision
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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 6.36 Renderbuff
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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 Any repr
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2.1. OPENGL FUNDAMENTALS 11 2.1.2 F
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2.2. GL STATE 13 After conversion,
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2.4. BASIC GL OPERATION 15 Type Des
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2.4. BASIC GL OPERATION 17 Display
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2.6. BEGIN/END PARADIGM 19 Error De
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2.6. BEGIN/END PARADIGM 21 Vertex C
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2.6. BEGIN/END PARADIGM 23 first ve
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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 does not exis
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2.8. VERTEX ARRAYS 51 is a restrict
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2.8. VERTEX ARRAYS 53 The command v
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2.9. BUFFER OBJECTS 55 } } else Dis
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2.9. BUFFER OBJECTS 57 Name Type In
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2.9. BUFFER OBJECTS 59 Name Value B
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2.9. BUFFER OBJECTS 61 pointers, or
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2.9. BUFFER OBJECTS 63 void *MapBuf
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2.9. BUFFER OBJECTS 65 sizeiptr siz
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2.10. VERTEX ARRAY OBJECTS 67 ing t
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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 91 2.14 Vertex
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2.14. VERTEX SHADERS 93 the text st
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2.14. VERTEX SHADERS 95 compiled to
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Page 121 and 122: 2.14. VERTEX SHADERS 101 where pipe
Page 123 and 124: 2.14. VERTEX SHADERS 103 or outputs
Page 125 and 126: 2.14. VERTEX SHADERS 105 in length
Page 127 and 128: 2.14. VERTEX SHADERS 107 Data type
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Page 131 and 132: 2.14. VERTEX SHADERS 111 uniform bl
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Page 147 and 148: 2.14. VERTEX SHADERS 127 matrix is
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Page 201 and 202: 2.18. ASYNCHRONOUS QUERIES 181 retu
Page 203 and 204: 2.19. CONDITIONAL RENDERING 183 2.1
Page 205 and 206: 2.20. TRANSFORM FEEDBACK 185 return
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Page 209 and 210: 2.20. TRANSFORM FEEDBACK 189 itive
Page 211 and 212: 2.21. PRIMITIVE QUERIES 191 is gene
Page 213 and 214: 2.22. FLATSHADING 193 Primitive typ
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2.25. CURRENT RASTER POSITION 199 c
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2.25. CURRENT RASTER POSITION 201 i
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203 Fixed function or fragment shad
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3.3. ANTIALIASING 205 these b bits
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3.3. ANTIALIASING 207 have fixed sa
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3.4. POINTS 209 derived size = clam
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¡ ¡ ¡ ¡ ¡ ¡ 3.4. POINTS 211 5
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3.4. POINTS 213 All fragments produ
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3.5. LINE SEGMENTS 215 ported is eq
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3.5. LINE SEGMENTS 217 window-coord
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3.5. LINE SEGMENTS 219 width = 2 wi
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3.6. POLYGONS 221 is rasterized as
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3.6. POLYGONS 223 is disabled or th
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3.6. POLYGONS 225 If x w and y w ar
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3.6. POLYGONS 227 given polygon is
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3.7. PIXEL RECTANGLES 229 Parameter
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3.7. PIXEL RECTANGLES 231 Parameter
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3.7. PIXEL RECTANGLES 233 pack buff
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3.7. PIXEL RECTANGLES 235 defines a
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3.7. PIXEL RECTANGLES 237 R, G, B,
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3.7. PIXEL RECTANGLES 239 precisely
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3.7. PIXEL RECTANGLES 241 Histogram
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¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡
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3.7. PIXEL RECTANGLES 245 Format Na
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3.7. PIXEL RECTANGLES 247 ROW_LENGT
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3.7. PIXEL RECTANGLES 249 an unsign
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3.7. PIXEL RECTANGLES 251 UNSIGNED_
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3.7. PIXEL RECTANGLES 253 Format Fi
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3.7. PIXEL RECTANGLES 255 3.7.5 Ras
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3.7. PIXEL RECTANGLES 257 (either z
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3.7. PIXEL RECTANGLES 259 must have
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3.7. PIXEL RECTANGLES 261 Base Filt
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3.7. PIXEL RECTANGLES 263 and C c i
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3.7. PIXEL RECTANGLES 265 ALPHA_BIA
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3.8. BITMAPS 267 ignored.) If a par
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3.9. TEXTURING 269 Bitmap Multisamp
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3.9. TEXTURING 271 specifies the ac
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3.9. TEXTURING 273 returns TRUE if
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3.9. TEXTURING 275 MIRRORED_REPEAT
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3.9. TEXTURING 277 elements in one
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3.9. TEXTURING 279 to a specific co
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3.9. TEXTURING 281 A preliminary sh
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3.9. TEXTURING 283 Sized internal c
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3.9. TEXTURING 285 Sized Base D S I
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3.9. TEXTURING 287 level of detail
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3.9. TEXTURING 289 • UNPACK_SKIP_
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3.9. TEXTURING 291 1.0 5.0 4 3 t v
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3.9. TEXTURING 293 defines a one-di
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3.9. TEXTURING 295 generates the er
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3.9. TEXTURING 297 • xoffset or y
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3.9. TEXTURING 299 of TEXTURE_WIDTH
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3.9. TEXTURING 301 This guarantee a
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3.9. TEXTURING 303 3.9.7 Buffer Tex
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3.9. TEXTURING 305 Internal formats
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3.9. TEXTURING 307 Texture paramete
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3.9. TEXTURING 309 Major Axis Direc
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3.9. TEXTURING 311 If λ(x, y) is l
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3.9. TEXTURING 313 Coordinate Wrapp
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3.9. TEXTURING 315 i 0 = wrap(⌊u
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3.9. TEXTURING 317 Figure 3.11. An
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3.9. TEXTURING 319 The values of le
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3.9. TEXTURING 321 3.9.12 Texture M
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3.9. TEXTURING 323 means that a tex
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3.9. TEXTURING 325 pixel data are t
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3.9. TEXTURING 327 Texture Base Tex
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3.9. TEXTURING 329 COMBINE_RGB Text
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3.9. TEXTURING 331 The state requir
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3.9. TEXTURING 333 reference value.
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3.9. TEXTURING 335 C f CT 0 CT 1 TE
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3.11. FOG 337 void Fog{if}( enum pn
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3.12. FRAGMENT SHADERS 339 MAX_FRAG
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3.12. FRAGMENT SHADERS 341 The resu
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3.12. FRAGMENT SHADERS 343 geometry
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3.12. FRAGMENT SHADERS 345 range co
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3.13. ANTIALIASING APPLICATION 347
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Chapter 4 Per-Fragment Operations a
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4.1. PER-FRAGMENT OPERATIONS 351 Fr
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4.1. PER-FRAGMENT OPERATIONS 353 st
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4.1. PER-FRAGMENT OPERATIONS 355 ma
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4.1. PER-FRAGMENT OPERATIONS 357 a
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4.1. PER-FRAGMENT OPERATIONS 359 4.
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4.1. PER-FRAGMENT OPERATIONS 361 Bl
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4.1. PER-FRAGMENT OPERATIONS 363 vo
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4.1. PER-FRAGMENT OPERATIONS 365 Th
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4.1. PER-FRAGMENT OPERATIONS 367 co
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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 393 If SAM
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4.4. FRAMEBUFFER OBJECTS 395 If a f
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4.4. FRAMEBUFFER OBJECTS 397 4.4.2
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4.4. FRAMEBUFFER OBJECTS 399 The co
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4.4. FRAMEBUFFER OBJECTS 401 error
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4.4. FRAMEBUFFER OBJECTS 403 void F
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4.4. FRAMEBUFFER OBJECTS 405 • Th
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4.4. FRAMEBUFFER OBJECTS 407 FRAMEB
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4.4. FRAMEBUFFER OBJECTS 409 • im
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4.4. FRAMEBUFFER OBJECTS 411 • At
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4.4. FRAMEBUFFER OBJECTS 413 4.4.5
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4.4. FRAMEBUFFER OBJECTS 415 Layer
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Chapter 5 Special Functions This ch
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5.1. EVALUATORS 419 Integers Reals
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5.1. EVALUATORS 421 The second way
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5.2. SELECTION 423 EvalCoord2(p *
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5.3. FEEDBACK 425 of each primitive
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5.4. TIMER QUERIES 427 Type coordin
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5.5. DISPLAY LISTS 429 started or s
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5.5. DISPLAY LISTS 431 provides an
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5.5. DISPLAY LISTS 433 Framebuffer
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5.7. SYNC OBJECTS AND FENCES 435 Pr
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5.7. SYNC OBJECTS AND FENCES 437 If
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5.8. HINTS 439 Target PERSPECTIVE_C
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6.1. QUERYING GL STATE 441 void Get
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6.1. QUERYING GL STATE 443 6.1.3 En
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6.1. QUERYING GL STATE 445 TEXTURE_
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6.1. QUERYING GL STATE 447 • form
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6.1. QUERYING GL STATE 449 6.1.5 Sa
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6.1. QUERYING GL STATE 451 format N
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6.1. QUERYING GL STATE 453 are used
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6.1. QUERYING GL STATE 455 the corr
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6.1. QUERYING GL STATE 457 target i
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6.1. QUERYING GL STATE 459 If sync
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6.1. QUERYING GL STATE 461 or size)
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6.1. QUERYING GL STATE 463 If pname
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6.1. QUERYING GL STATE 465 If pname
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6.1. QUERYING GL STATE 467 range[0]
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6.1. QUERYING GL STATE 469 return t
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6.1. QUERYING GL STATE 471 • If p
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6.1. QUERYING GL STATE 473 6.1.21 S
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6.2. STATE TABLES 475 Operations on
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6.2. STATE TABLES 477 when not usin
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6.2. STATE TABLES 479 Get value Typ
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6.2. STATE TABLES 529 Get Command M
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6.2. STATE TABLES 531 Get Command M
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A.2. MULTI-PASS ALGORITHMS 543 A.2
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A.4. TESSELLATION INVARIANCE 545 Ru
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A.5. WHAT ALL THIS MEANS 547 Rule 7
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549 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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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 569 New Token N
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F.5. CREDITS AND ACKNOWLEDGEMENTS 5
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F.5. CREDITS AND ACKNOWLEDGEMENTS 5
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G.2. DEPRECATION MODEL 575 state ha
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G.4. CREDITS AND ACKNOWLEDGEMENTS 5
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Appendix H Version 3.2 OpenGL versi
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H.4. CHANGE LOG 581 New Token Name
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H.5. CREDITS AND ACKNOWLEDGEMENTS 5
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H.5. CREDITS AND ACKNOWLEDGEMENTS 5
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I.2. DEPRECATION MODEL 587 ing fact
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I.4. CREDITS AND ACKNOWLEDGEMENTS 5
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J.1. NEW FEATURES 591 • Mechanism
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J.4. CREDITS AND ACKNOWLEDGEMENTS 5
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Appendix K Version 4.1 OpenGL versi
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K.5. CREDITS AND ACKNOWLEDGEMENTS 5
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Appendix L Extension Registry, Head
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L.3. ARB EXTENSIONS 601 L.3.2 be am
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L.3. ARB EXTENSIONS 603 L.3.13 Text
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L.3. ARB EXTENSIONS 605 L.3.28 Open
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L.3. ARB EXTENSIONS 607 The name st
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L.3. ARB EXTENSIONS 609 equivalent
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L.3. ARB EXTENSIONS 611 L.3.59 Seam
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L.3. ARB EXTENSIONS 613 The name st
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L.3. ARB EXTENSIONS 615 L.3.84 Tess
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L.3. ARB EXTENSIONS 617 L.3.97 Cont
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INDEX 619 519 ACTIVE UNIFORM BLOCKS
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INDEX 621 CallList, 31, 430, 431, 5
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INDEX 623 RGTC2, 280, 285, 554 COMP
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INDEX 625 DEPTH FUNC, 500 DEPTH RAN
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INDEX 627 EvalCoord1f, 421 EvalCoor
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INDEX 629 FramebufferRenderbuffer,
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INDEX 631 GetQueryObjectiv, 457, 52
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INDEX 633 GL ARB texture cube map a
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INDEX 635 HISTOGRAM ALPHA SIZE, 453
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INDEX 637 layout, 126 LEFT, 360, 37
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INDEX 639 MAX CLIP DISTANCES, 528,
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INDEX 641 MAX TRANSFORM FEEDBACK -
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INDEX 643 PACK IMAGE HEIGHT, 382, 4
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INDEX 645 101, 143, 464 PROGRAM BIN
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INDEX 647 189, 190 RETURN, 379 RG,
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INDEX 649 SECONDARY COLOR ARRAY - P
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INDEX 651 TESS GEN VERTEX ORDER, 46
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INDEX 653 TEXTURE CUBE MAP POS- ITI
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INDEX 655 Uniform*i{v}, 121, 122 Un
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INDEX 657 UNSIGNED SHORT 5 6 5 REV,
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OpenGL 4.1 (Compatibility Profile) - July 25, 2010

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