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3.10. TEXTURING 350 Texture Base REPLACE MODULATE DECAL Internal Format Function Function Function ALPHA C v = C p C v = C p undefined A v = A s A v = A p A s LUMINANCE C v = C s C v = C p C s undefined (or 1) A v = A p A v = A p LUMINANCE_ALPHA C v = C s C v = C p C s undefined (or 2) A v = A s A v = A p A s INTENSITY C v = C s C v = C p C s undefined A v = A s A v = A p A s RGB, RG, RED, C v = C s C v = C p C s C v = C s or 3 A v = A p A v = A p A v = A p RGBA C v = C s C v = C p C s C v = C p (1 − A s ) + C s A s or 4 A v = A s A v = A p A s A v = A p Table 3.26: Texture functions REPLACE, MODULATE, and DECAL. Texture Base BLEND ADD Internal Format Function Function ALPHA C v = C p C v = C p A v = A p A s A v = A p A s LUMINANCE C v = C p (1 − C s ) + C c C s C v = C p + C s (or 1) A v = A p A v = A p LUMINANCE_ALPHA C v = C p (1 − C s ) + C c C s C v = C p + C s (or 2) A v = A p A s A v = A p A s INTENSITY C v = C p (1 − C s ) + C c C s C v = C p + C s A v = A p (1 − A s ) + A c A s A v = A p + A s RGB, RG, RED, C v = C p (1 − C s ) + C c C s C v = C p + C s or 3 A v = A p A v = A p RGBA C v = C p (1 − C s ) + C c C s C v = C p + C s or 4 A v = A p A s A v = A p A s Table 3.27: Texture functions BLEND and ADD. OpenGL 4.2 (Compatibility Profile) - August 22, 2011
3.10. TEXTURING 351 If the value of TEXTURE_ENV_MODE is COMBINE, the form of the texture function depends on the values of COMBINE_RGB and COMBINE_ALPHA, according to table 3.28. The RGB and ALPHA results of the texture function are then multiplied by the values of RGB_SCALE and ALPHA_SCALE, respectively. If fragment color clamping is enabled, the arguments and results used in table 3.28 are clamped to [0, 1]. Otherwise, the results are unmodified. The arguments Arg0, Arg1, and Arg2 are determined by the values of SRCn_- RGB, SRCn_ALPHA, OPERANDn_RGB and OPERANDn_ALPHA, where n = 0, 1, or 2, as shown in tables 3.29 and 3.30. C s n and A s n denote the texture source color and alpha from the texture image bound to texture unit n The state required for the current texture environment, for each texture unit, consists of a six-valued integer indicating the texture function, an eight-valued integer indicating the RGB combiner function and a six-valued integer indicating the ALPHA combiner function, six four-valued integers indicating the combiner RGB and ALPHA source arguments, three four-valued integers indicating the combiner RGB operands, three two-valued integers indicating the combiner ALPHA operands, and four floating-point environment color values. In the initial state, the texture and combiner functions are each MODULATE, the combiner RGB and ALPHA sources are each TEXTURE, PREVIOUS, and CONSTANT for sources 0, 1, and 2 respectively, the combiner RGB operands for sources 0 and 1 are each SRC_COLOR, the combiner RGB operand for source 2, as well as for the combiner ALPHA operands, are each SRC_ALPHA, and the environment color is (0, 0, 0, 0). The state required for the texture filtering parameters, for each texture unit, consists of a single floating-point level of detail bias. The initial value of the bias is 0.0. 3.10.18 Texture Comparison Modes Texture values can also be computed according to a specified comparison function. Texture parameter TEXTURE_COMPARE_MODE specifies the comparison operands, and parameter TEXTURE_COMPARE_FUNC specifies the comparison function. The format of the resulting texture sample is determined by the value of DEPTH_- TEXTURE_MODE. Depth Texture Comparison Mode If the currently bound texture’s base internal format is DEPTH_COMPONENT or DEPTH_STENCIL, then DEPTH_TEXTURE_MODE, TEXTURE_COMPARE_MODE and TEXTURE_COMPARE_FUNC control the output of the texture unit as described be- 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(−
Page 319 and 320: 3.10. TEXTURING 299 Sized internal
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Page 335 and 336: 3.10. TEXTURING 315 storage modes c
Page 337 and 338: 3.10. TEXTURING 317 • data points
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Page 343 and 344: 3.10. TEXTURING 323 Internal format
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Page 367 and 368: 3.10. TEXTURING 347 } width = max(1
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Page 377 and 378: 3.10. TEXTURING 357 the second text
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Page 383 and 384: 3.10. TEXTURING 363 Supported image
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Page 407 and 408: 4.1. PER-FRAGMENT OPERATIONS 387 St
Page 409 and 410: 4.1. PER-FRAGMENT OPERATIONS 389 Be
Page 411 and 412: 4.1. PER-FRAGMENT OPERATIONS 391 dr
Page 413 and 414: 4.1. PER-FRAGMENT OPERATIONS 393 vo
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4.2. WHOLE FRAMEBUFFER OPERATIONS 4
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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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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
Page 703 and 704:
INDEX 683 DrawArraysInstanced, 48,
Page 705 and 706:
INDEX 685 Flush, 463, 464, 468, 587
Page 707 and 708:
INDEX 687 GetActiveAtomicCounterBuf
Page 709 and 710:
INDEX 689 GetVertexAttribdv, 498, 4
Page 711 and 712:
INDEX 691 GL ARB viewport array, 64
Page 713 and 714:
INDEX 693 IMAGE 2D RECT, 123 IMAGE
Page 715 and 716:
INDEX 695 512-514, 516, 518-525, 53
Page 717 and 718:
INDEX 697 MapGrid1, 451 MapGrid2, 4
Page 719 and 720:
INDEX 699 MAX SERVER WAIT TIMEOUT,
Page 721 and 722:
INDEX 701 MultTransposeMatrix, 72,
Page 723 and 724:
INDEX 703 POINT SIZE GRANULARITY, 5
Page 725 and 726:
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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