OpenGL 4.2 (Compatibility Profile) - April 27, 2012

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3.6. POLYGONS 238 In addition, during rasterization an integer stipple counter must be maintained to implement line stippling. The initial value of the line width is 1.0. The initial state of line segment antialiasing is disabled. The initial value of the line stipple is F F F F 16 (a stipple of all ones). The initial value of the line stipple repeat count is one. The initial state of line stippling is disabled. 3.5.4 Line Multisample Rasterization If MULTISAMPLE is enabled, and the value of SAMPLE_BUFFERS is one, then lines are rasterized using the following algorithm, regardless of whether line antialiasing (LINE_SMOOTH) is enabled or disabled. Line rasterization produces a fragment for each framebuffer pixel with one or more sample points that intersect the rectangular region that is described in the Antialiasing portion of section 3.5.2 (Other Line Segment Features). If line stippling is enabled, the rectangular region is subdivided into adjacent unit-length rectangles, with some rectangles eliminated according to the procedure given in section 3.5.2, where “fragment” is replaced by “rectangle”. Coverage bits that correspond to sample points that intersect a retained rectangle are 1, other coverage bits are 0. Each depth value and set of associated data is produced by substituting the corresponding sample location into equation 3.5, then using the result to evaluate equation 3.7. An implementation may choose to assign the associated data to more than one sample by evaluating equation 3.5 at any location within the pixel including the fragment center or any one of the sample locations, then substituting into equation 3.6. The different associated data values need not be evaluated at the same location. Line width range and number of gradations are equivalent to those supported for antialiased lines. 3.6 Polygons A polygon results from a triangle arising from a triangle strip, triangle fan, or series of separate triangles, a polygon Begin / End object, or a quadrilateral arising from a quadrilateral strip, series of separate quadrilaterals, or Rect command. Like points and line segments, polygon rasterization is controlled by several variables. Polygon antialiasing is controlled with Enable and Disable with the symbolic constant POLYGON_SMOOTH. The analog to line segment stippling for polygons is polygon stippling, described below. OpenGL 4.2 (Compatibility Profile) - April 27, 2012
3.6. POLYGONS 239 3.6.1 Basic Polygon Rasterization The first step of polygon rasterization is to determine if the polygon is back-facing or front-facing. This determination is made based on the sign of the (clipped or unclipped) polygon’s area computed in window coordinates. One way to compute this area is a = 1 2 n−1 ∑ x i wyw i⊕1 i=0 − x i⊕1 w y i w (3.8) where x i w and y i w are the x and y window coordinates of the ith vertex of the n-vertex polygon (vertices are numbered starting at zero for purposes of this computation) and i⊕1 is (i+1) mod n. The interpretation of the sign of this value is controlled with void FrontFace( enum dir ); Setting dir to CCW (corresponding to counter-clockwise orientation of the projected polygon in window coordinates) uses a as computed above. Setting dir to CW (corresponding to clockwise orientation) indicates that the sign of a should be reversed prior to use. Front face determination requires one bit of state, and is initially set to CCW. If the sign of a (including the possible reversal of this sign as determined by FrontFace) is positive, the polygon is front-facing; otherwise, it is back-facing. This determination is used in conjunction with the CullFace enable bit and mode value to decide whether or not a particular polygon is rasterized. The CullFace mode is set by calling void CullFace( enum mode ); mode is a symbolic constant: one of FRONT, BACK or FRONT_AND_BACK. Culling is enabled or disabled with Enable or Disable using the symbolic constant CULL_- FACE. Front-facing polygons are rasterized if either culling is disabled or the Cull- Face mode is BACK while back-facing polygons are rasterized only if either culling is disabled or the CullFace mode is FRONT. The initial setting of the CullFace mode is BACK. Initially, culling is disabled. The rule for determining which fragments are produced by polygon rasterization is called point sampling. The two-dimensional projection obtained by taking the x and y window coordinates of the polygon’s vertices is formed. Fragment centers that lie inside of this polygon are produced by rasterization. Special treatment is given to a fragment whose center lies on a polygon boundary edge. In 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 2.15 Tessellation . .
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CONTENTS v 3.12 Fog . . . . . . . .
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CONTENTS vii A Invariance 587 A.1 R
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CONTENTS ix L Version 4.2 658 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 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 generi
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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 The command v
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2.8. VERTEX ARRAYS 51 if (mode, cou
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2.8. VERTEX ARRAYS 53 } cmd->count,
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2.8. VERTEX ARRAYS 55 InterleavedAr
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2.9. BUFFER OBJECTS 57 Target name
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2.9. BUFFER OBJECTS 59 while used a
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2.9. BUFFER OBJECTS 61 void BufferS
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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 The command voi
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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 • There
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2.14. VERTEX SHADERS 107 • A bool
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2.14. VERTEX SHADERS 109 2.14.6 Ver
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2.14. VERTEX SHADERS 111 convention
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2.14. VERTEX SHADERS 113 LinkProgra
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2.14. VERTEX SHADERS 115 Similarly,
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2.14. VERTEX SHADERS 117 uniformBlo
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2.14. VERTEX SHADERS 119 REFERENCED
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2.14. VERTEX SHADERS 121 of the val
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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 passed to
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2.14. VERTEX SHADERS 129 If the val
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2.14. VERTEX SHADERS 131 • Member
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2.14. VERTEX SHADERS 133 matrix is
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2.14. VERTEX SHADERS 135 Additional
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2.14. VERTEX SHADERS 137 for the sh
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2.14. VERTEX SHADERS 139 2.14.9 Sam
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2.14. VERTEX SHADERS 141 ponents. F
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2.14. VERTEX SHADERS 143 • any va
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2.14. VERTEX SHADERS 145 • Per ve
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2.14. VERTEX SHADERS 147 • the co
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2.14. VERTEX SHADERS 149 Texture lo
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2.14. VERTEX SHADERS 151 • the ve
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2.14. VERTEX SHADERS 153 The INVALI
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2.14. VERTEX SHADERS 155 fragment s
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2.14. VERTEX SHADERS 157 command th
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2.14. VERTEX SHADERS 159 accessed t
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2.15. TESSELLATION 161 • A boolea
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2.15. TESSELLATION 163 output varia
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2.15. TESSELLATION 165 Tessellation
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2.15. TESSELLATION 167 variables. U
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2.15. TESSELLATION 169 tive influen
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2.15. TESSELLATION 171 are typicall
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2.15. TESSELLATION 173 Figure 2.14.
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2.15. TESSELLATION 175 and horizont
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2.15. TESSELLATION 177 second outer
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2.15. TESSELLATION 179 Tessellation
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2.15. TESSELLATION 181 vertex being
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2.16. GEOMETRY SHADERS 183 2.16 Geo
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2.16. GEOMETRY SHADERS 185 Geometry
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Page 217 and 218: 2.18. ASYNCHRONOUS QUERIES 197 Each
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Page 221 and 222: 2.20. TRANSFORM FEEDBACK 201 return
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Page 229 and 230: 2.22. FLATSHADING 209 Primitive typ
Page 231 and 232: 2.23. PRIMITIVE CLIPPING 211 the pl
Page 233 and 234: 2.24. FINAL COLOR PROCESSING 213 2.
Page 235 and 236: 2.25. CURRENT RASTER POSITION 215 f
Page 237 and 238: 2.25. CURRENT RASTER POSITION 217 s
Page 239 and 240: 219 Fixed function or fragment shad
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Page 243 and 244: 3.3. ANTIALIASING 223 void GetMulti
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Page 251 and 252: 3.4. POINTS 231 where size is the p
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Page 255 and 256: 3.5. LINE SEGMENTS 235 Line Stipple
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Page 263 and 264: 3.6. POLYGONS 243 3.6.5 Depth Offse
Page 265 and 266: 3.7. PIXEL RECTANGLES 245 polygon r
Page 267 and 268: 3.7. PIXEL RECTANGLES 247 3.7.2 The
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Page 271 and 272: 3.7. PIXEL RECTANGLES 251 The color
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Page 281 and 282: 3.7. PIXEL RECTANGLES 261 type Para
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3.10. TEXTURING 289 a texture matri
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3.10. TEXTURING 291 returns TRUE if
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3.10. TEXTURING 293 if TEXTURE_WRAP
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3.10. TEXTURING 295 parameter UNPAC
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3.10. TEXTURING 297 Generic compres
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3.10. TEXTURING 299 N is the number
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3.10. TEXTURING 301 Sized internal
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3.10. TEXTURING 303 Sized Base D S
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3.10. TEXTURING 305 Thus the last t
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3.10. TEXTURING 307 of TEXTURE_CUBE
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3.10. TEXTURING 309 1.0 5.0 4 3 t v
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3.10. TEXTURING 311 index values fr
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3.10. TEXTURING 313 counterparts. A
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3.10. TEXTURING 315 If the internal
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3.10. TEXTURING 317 by b s , b w ,
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3.10. TEXTURING 319 • data points
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3.10. TEXTURING 321 FORMAT, and TEX
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3.10. TEXTURING 323 If either width
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3.10. TEXTURING 325 Internal format
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3.10. TEXTURING 327 Name Type Legal
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3.10. TEXTURING 329 Major Axis Dire
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3.10. TEXTURING 331 Scale Factor an
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3.10. TEXTURING 333 where ∆x = x
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3.10. TEXTURING 335 If the selected
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3.10. TEXTURING 337 Figure 3.11. An
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3.10. TEXTURING 339 where max(1,
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3.10. TEXTURING 341 The internal fo
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3.10. TEXTURING 343 A cube map arra
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3.10. TEXTURING 345 and maximum lev
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3.10. TEXTURING 347 • If executin
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3.10. TEXTURING 349 • target is n
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3.10. TEXTURING 351 When target is
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3.10. TEXTURING 353 Texture Base RE
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3.10. TEXTURING 355 SRCn_RGB OPERAN
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3.10. TEXTURING 357 If the value of
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3.10. TEXTURING 359 bound texture i
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3.10. TEXTURING 361 state, all text
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3.10. TEXTURING 363 Texture target
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3.10. TEXTURING 365 unit, as enumer
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3.10. TEXTURING 367 • reading the
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3.12. FOG 369 Color sum is enabled
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3.13. FRAGMENT SHADERS 371 sections
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3.13. FRAGMENT SHADERS 373 A fragme
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3.13. FRAGMENT SHADERS 375 as follo
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3.13. FRAGMENT SHADERS 377 The buil
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3.13. FRAGMENT SHADERS 379 void Bin
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3.14. ANTIALIASING APPLICATION 381
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383 the GL context, the framebuffer
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4.1. PER-FRAGMENT OPERATIONS 385 th
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4.1. PER-FRAGMENT OPERATIONS 387 Al
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4.1. PER-FRAGMENT OPERATIONS 389 vo
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4.1. PER-FRAGMENT OPERATIONS 391 ba
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4.1. PER-FRAGMENT OPERATIONS 393 Bl
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4.1. PER-FRAGMENT OPERATIONS 395 Mo
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4.1. PER-FRAGMENT OPERATIONS 397 Fu
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4.1. PER-FRAGMENT OPERATIONS 399 is
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4.1. PER-FRAGMENT OPERATIONS 401 Ar
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4.2. WHOLE FRAMEBUFFER OPERATIONS 4
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4.3. DRAWING, READING, AND COPYING
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¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡ ¡
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4.4. FRAMEBUFFER OBJECTS 427 4.3.4
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4.4. FRAMEBUFFER OBJECTS 429 Frameb
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4.4. FRAMEBUFFER OBJECTS 431 • A
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4.4. FRAMEBUFFER OBJECTS 433 Sized
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4.4. FRAMEBUFFER OBJECTS 435 set to
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4.4. FRAMEBUFFER OBJECTS 437 TEXTUR
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4.4. FRAMEBUFFER OBJECTS 439 • If
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4.4. FRAMEBUFFER OBJECTS 441 For th
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4.4. FRAMEBUFFER OBJECTS 443 • im
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4.4. FRAMEBUFFER OBJECTS 445 • At
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4.4. FRAMEBUFFER OBJECTS 447 4.4.5
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4.4. FRAMEBUFFER OBJECTS 449 Layer
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Chapter 5 Special Functions This ch
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5.1. EVALUATORS 453 Integers Reals
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5.1. EVALUATORS 455 The second way
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5.2. SELECTION 457 EvalCoord2(p *
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5.3. FEEDBACK 459 of each primitive
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5.4. TIMER QUERIES 461 Type coordin
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5.5. DISPLAY LISTS 463 started or s
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5.5. DISPLAY LISTS 465 provides an
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5.5. DISPLAY LISTS 467 Framebuffer
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5.7. SYNC OBJECTS AND FENCES 469 Pr
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5.7. SYNC OBJECTS AND FENCES 471 If
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5.8. HINTS 473 Target PERSPECTIVE_C
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6.1. QUERYING GL STATE 475 void Get
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6.1. QUERYING GL STATE 477 6.1.3 En
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6.1. QUERYING GL STATE 479 target m
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6.1. QUERYING GL STATE 481 • form
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6.1. QUERYING GL STATE 483 When the
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6.1. QUERYING GL STATE 485 format N
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6.1. QUERYING GL STATE 487 target m
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6.1. QUERYING GL STATE 489 resets a
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6.1. QUERYING GL STATE 491 names, a
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6.1. QUERYING GL STATE 493 void Get
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6.1. QUERYING GL STATE 495 To query
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6.1. QUERYING GL STATE 497 returns
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6.1. QUERYING GL STATE 499 which ha
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6.1. QUERYING GL STATE 501 tion att
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6.1. QUERYING GL STATE 503 obtain t
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6.1. QUERYING GL STATE 505 returns
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6.1. QUERYING GL STATE 507 • If p
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6.1. QUERYING GL STATE 509 If pname
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6.1. QUERYING GL STATE 511 Stack At
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6.2. STATE TABLES 513 Type code Exp
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6.2. STATE TABLES 515 Get value Typ
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6.2. STATE TABLES 537 Get Command I
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6.2. STATE TABLES 553 Get Command I
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6.2. STATE TABLES 569 Get Command M
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Appendix A Invariance The OpenGL sp
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A.3. INVARIANCE RULES 589 • Sciss
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A.4. TESSELLATION INVARIANCE 591
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A.5. ATOMIC COUNTER INVARIANCE 593
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Appendix B Corollaries The followin
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597 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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Appendix E Profiles and the Depreca
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E.2. DEPRECATED AND REMOVED FEATURE
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F.2. DEPRECATION MODEL 627 • Fine
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F.4. CHANGE LOG 629 • Changed Cle
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F.5. CREDITS AND ACKNOWLEDGEMENTS 6
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Appendix G Version 3.1 OpenGL versi
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G.4. CREDITS AND ACKNOWLEDGEMENTS 6
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G.4. CREDITS AND ACKNOWLEDGEMENTS 6
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H.2. DEPRECATION MODEL 639 • BGRA
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H.4. CHANGE LOG 641 • Change flat
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H.5. CREDITS AND ACKNOWLEDGEMENTS 6
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Appendix I Version 3.3 OpenGL versi
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I.3. CHANGE LOG 647 I.3 Change Log
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Appendix J Version 4.0 OpenGL versi
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J.2. DEPRECATION MODEL 651 (GL_ARB_
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J.4. CREDITS AND ACKNOWLEDGEMENTS 6
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K.2. DEPRECATION MODEL 655 • Abil
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K.5. CREDITS AND ACKNOWLEDGEMENTS 6
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L.2. DEPRECATION MODEL 659 • Inst
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L.4. CHANGE LOG 661 • Change core
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L.4. CHANGE LOG 663 • Add error c
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L.4. CHANGE LOG 665 • Add multisa
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L.4. CHANGE LOG 667 • Remove clam
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L.5. CREDITS AND ACKNOWLEDGEMENTS 6
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M.3. ARB EXTENSIONS 671 combination
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M.3. ARB EXTENSIONS 673 M.3.6 Textu
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M.3. ARB EXTENSIONS 675 M.3.21 Low-
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M.3. ARB EXTENSIONS 677 The name st
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M.3. ARB EXTENSIONS 679 The name st
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M.3. ARB EXTENSIONS 681 M.3.53 Fast
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M.3. ARB EXTENSIONS 683 M.3.65 Cube
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M.3. ARB EXTENSIONS 685 M.3.76 RGB1
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M.3. ARB EXTENSIONS 687 M.3.90 Sepa
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M.3. ARB EXTENSIONS 689 introduced
Page 711 and 712:
Index x, 549 x BIAS, 248, 545 x BIT
Page 713 and 714:
INDEX 693 ATOMIC COUNTER BUFFER REF
Page 715 and 716:
INDEX 695 ClearBuffer*, 199, 220, 4
Page 717 and 718:
INDEX 697 CompressedTexSubImage, 66
Page 719 and 720:
INDEX 699 DEPTH STENCIL ATTACHMENT,
Page 721 and 722:
INDEX 701 558 equal spacing, 169 EQ
Page 723 and 724:
INDEX 703 LAYER TARGETS, 444 FRAMEB
Page 725 and 726:
INDEX 705 GetPixelMap, 477, 549 Get
Page 727 and 728:
INDEX 707 GL ARB shader bit encodin
Page 729 and 730:
INDEX 709 gl BackColor, 106 gl Back
Page 731 and 732:
INDEX 711 304, 327, 328, 352, 353,
Page 733 and 734:
INDEX 713 LIST BIT, 511 LIST INDEX,
Page 735 and 736:
INDEX 715 394, 396, 405, 407, 411,
Page 737 and 738:
INDEX 717 141, 577, 621, 628, 639 M
Page 739 and 740:
INDEX 719 OR, 401 OR INVERTED, 401
Page 741 and 742:
INDEX 721 SCALE, 281 PREVIOUS, 355,
Page 743 and 744:
INDEX 723 RENDER, 458, 459, 586 REN
Page 745 and 746:
INDEX 725 SampleCoverage, 388, 660
Page 747 and 748:
INDEX 727 STENCIL BACK PASS DEPTH -
Page 749 and 750:
INDEX 729 TEXTURE BINDING xD, 529 T
Page 751 and 752:
INDEX 731 157 TEXTURE WIDTH, 315, 3
Page 753 and 754:
INDEX 733 UNIFORM BUFFER START, 495
Page 755 and 756:
INDEX 735 uvec3, 110, 122 uvec4, 11
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OpenGL 4.2 (Compatibility Profile) - April 27, 2012

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