HCoop / clinton / guile-figl.git / blame
| Commit | Line | Data |
|---|---|---|
| 7faf1d71 AW |
1 | <?xml version="1.0" encoding="UTF-8"?> |
| 2 | <!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN" | |
| 3 | "http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd"> | |
| 4 | <refentry id="glBlendFuncSeparate"> | |
| 5 | <refmeta> | |
| 6 | <refmetainfo> | |
| 7 | <copyright> | |
| 8 | <year>1991-2006</year> | |
| 9 | <holder>Silicon Graphics, Inc.</holder> | |
| 10 | </copyright> | |
| 11 | </refmetainfo> | |
| 12 | <refentrytitle>glBlendFuncSeparate</refentrytitle> | |
| 13 | <manvolnum>3G</manvolnum> | |
| 14 | </refmeta> | |
| 15 | <refnamediv> | |
| 16 | <refname>glBlendFuncSeparate</refname> | |
| 17 | <refpurpose>specify pixel arithmetic for RGB and alpha components separately</refpurpose> | |
| 18 | </refnamediv> | |
| 19 | <refsynopsisdiv><title>C Specification</title> | |
| 20 | <funcsynopsis> | |
| 21 | <funcprototype> | |
| 22 | <funcdef>void <function>glBlendFuncSeparate</function></funcdef> | |
| 23 | <paramdef>GLenum <parameter>srcRGB</parameter></paramdef> | |
| 24 | <paramdef>GLenum <parameter>dstRGB</parameter></paramdef> | |
| 25 | <paramdef>GLenum <parameter>srcAlpha</parameter></paramdef> | |
| 26 | <paramdef>GLenum <parameter>dstAlpha</parameter></paramdef> | |
| 27 | </funcprototype> | |
| 28 | <funcprototype> | |
| 29 | <funcdef>void <function>glBlendFuncSeparatei</function></funcdef> | |
| 30 | <paramdef>GLuint <parameter>buf</parameter></paramdef> | |
| 31 | <paramdef>GLenum <parameter>srcRGB</parameter></paramdef> | |
| 32 | <paramdef>GLenum <parameter>dstRGB</parameter></paramdef> | |
| 33 | <paramdef>GLenum <parameter>srcAlpha</parameter></paramdef> | |
| 34 | <paramdef>GLenum <parameter>dstAlpha</parameter></paramdef> | |
| 35 | </funcprototype> | |
| 36 | </funcsynopsis> | |
| 37 | </refsynopsisdiv> | |
| 38 | <!-- eqn: ignoring delim $$ --> | |
| 39 | <refsect1 id="parameters"><title>Parameters</title> | |
| 40 | <variablelist> | |
| 41 | <varlistentry> | |
| 42 | <term><parameter>buf</parameter></term> | |
| 43 | <listitem> | |
| 44 | <para> | |
| 45 | For <function>glBlendFuncSeparatei</function>, specifies the index of the draw | |
| 46 | buffer for which to set the blend functions. | |
| 47 | </para> | |
| 48 | </listitem> | |
| 49 | </varlistentry> | |
| 50 | <varlistentry> | |
| 51 | <term><parameter>srcRGB</parameter></term> | |
| 52 | <listitem> | |
| 53 | <para> | |
| 54 | Specifies how the red, green, and blue blending factors are computed. | |
| 55 | The initial value is <constant>GL_ONE</constant>. | |
| 56 | </para> | |
| 57 | </listitem> | |
| 58 | </varlistentry> | |
| 59 | <varlistentry> | |
| 60 | <term><parameter>dstRGB</parameter></term> | |
| 61 | <listitem> | |
| 62 | <para> | |
| 63 | Specifies how the red, green, and blue destination blending factors are | |
| 64 | computed. | |
| 65 | The initial value is <constant>GL_ZERO</constant>. | |
| 66 | </para> | |
| 67 | </listitem> | |
| 68 | </varlistentry> | |
| 69 | <varlistentry> | |
| 70 | <term><parameter>srcAlpha</parameter></term> | |
| 71 | <listitem> | |
| 72 | <para> | |
| 73 | Specified how the alpha source blending factor is computed. | |
| 74 | The initial value is <constant>GL_ONE</constant>. | |
| 75 | </para> | |
| 76 | </listitem> | |
| 77 | </varlistentry> | |
| 78 | <varlistentry> | |
| 79 | <term><parameter>dstAlpha</parameter></term> | |
| 80 | <listitem> | |
| 81 | <para> | |
| 82 | Specified how the alpha destination blending factor is computed. | |
| 83 | The initial value is <constant>GL_ZERO</constant>. | |
| 84 | </para> | |
| 85 | </listitem> | |
| 86 | </varlistentry> | |
| 87 | </variablelist> | |
| 88 | </refsect1> | |
| 89 | <refsect1 id="description"><title>Description</title> | |
| 90 | <para> | |
| 91 | Pixels can be drawn using a function that blends | |
| 92 | the incoming (source) RGBA values with the RGBA values | |
| 93 | that are already in the frame buffer (the destination values). | |
| 94 | Blending is initially disabled. | |
| 95 | Use <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry> and <citerefentry><refentrytitle>glDisable</refentrytitle></citerefentry> with argument <constant>GL_BLEND</constant> | |
| 96 | to enable and disable blending. | |
| 97 | </para> | |
| 98 | <para> | |
| 99 | <function>glBlendFuncSeparate</function> defines the operation of blending for all draw buffers when it is enabled. | |
| 100 | <function>glBlendFuncSeparatei</function> defines the operation of blending for a single draw buffer | |
| 101 | specified by <parameter>buf</parameter> when enabled for that draw buffer. | |
| 102 | <parameter>srcRGB</parameter> specifies which method is used to scale the | |
| 103 | source RGB-color components. | |
| 104 | <parameter>dstRGB</parameter> specifies which method is used to scale the | |
| 105 | destination RGB-color components. | |
| 106 | Likewise, <parameter>srcAlpha</parameter> specifies which method is used to scale the source alpha | |
| 107 | color component, and <parameter>dstAlpha</parameter> specifies which method is used to scale the | |
| 108 | destination alpha component. | |
| 109 | The possible methods are described in the following table. | |
| 110 | Each method defines four scale factors, | |
| 111 | one each for red, green, blue, and alpha. | |
| 112 | </para> | |
| 113 | <para> | |
| 114 | In the table and in subsequent equations, first source, second source and destination | |
| 115 | color components are referred to as | |
| 116 | <inlineequation><mml:math> | |
| 117 | <!-- eqn: ( R sub s0 , G sub s0 , B sub s0 , A sub s0 ): --> | |
| 118 | <mml:mfenced open="(" close=")"> | |
| 119 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 120 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 121 | </mml:msub> | |
| 122 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 123 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 124 | </mml:msub> | |
| 125 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 126 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 127 | </mml:msub> | |
| 128 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 129 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 130 | </mml:msub> | |
| 131 | </mml:mfenced> | |
| 132 | </mml:math></inlineequation>, | |
| 133 | <inlineequation><mml:math> | |
| 134 | <!-- eqn: ( R sub s1 , G sub s1 , B sub s1 , A sub s1 ): --> | |
| 135 | <mml:mfenced open="(" close=")"> | |
| 136 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 137 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 138 | </mml:msub> | |
| 139 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 140 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 141 | </mml:msub> | |
| 142 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 143 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 144 | </mml:msub> | |
| 145 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 146 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 147 | </mml:msub> | |
| 148 | </mml:mfenced> | |
| 149 | </mml:math></inlineequation>, | |
| 150 | and | |
| 151 | <inlineequation><mml:math> | |
| 152 | <!-- eqn: ( R sub d , G sub d , B sub d , A sub d ): --> | |
| 153 | <mml:mfenced open="(" close=")"> | |
| 154 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 155 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 156 | </mml:msub> | |
| 157 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 158 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 159 | </mml:msub> | |
| 160 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 161 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 162 | </mml:msub> | |
| 163 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 164 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 165 | </mml:msub> | |
| 166 | </mml:mfenced> | |
| 167 | </mml:math></inlineequation>, respectively. | |
| 168 | The color specified by <citerefentry><refentrytitle>glBlendColor</refentrytitle></citerefentry> is referred to as | |
| 169 | <inlineequation><mml:math> | |
| 170 | <!-- eqn: ( R sub c , G sub c , B sub c , A sub c ): --> | |
| 171 | <mml:mfenced open="(" close=")"> | |
| 172 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 173 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 174 | </mml:msub> | |
| 175 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 176 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 177 | </mml:msub> | |
| 178 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 179 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 180 | </mml:msub> | |
| 181 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 182 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 183 | </mml:msub> | |
| 184 | </mml:mfenced> | |
| 185 | </mml:math></inlineequation>. | |
| 186 | They are understood to have integer values between 0 and | |
| 187 | <inlineequation><mml:math> | |
| 188 | <!-- eqn: ( k sub R , k sub G , k sub B , k sub A ): --> | |
| 189 | <mml:mfenced open="(" close=")"> | |
| 190 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 191 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 192 | </mml:msub> | |
| 193 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 194 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 195 | </mml:msub> | |
| 196 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 197 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 198 | </mml:msub> | |
| 199 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 200 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 201 | </mml:msub> | |
| 202 | </mml:mfenced> | |
| 203 | </mml:math></inlineequation>, | |
| 204 | where | |
| 205 | </para> | |
| 206 | <para> | |
| 207 | <para> | |
| 208 | <inlineequation><mml:math> | |
| 209 | <!-- eqn: k sub c = 2 sup {m sub c} - 1: --> | |
| 210 | <mml:mrow> | |
| 211 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 212 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 213 | </mml:msub> | |
| 214 | <mml:mo>=</mml:mo> | |
| 215 | <mml:mrow> | |
| 216 | <mml:msup><mml:mn>2</mml:mn> | |
| 217 | <mml:mfenced open="" close=""> | |
| 218 | <mml:msub><mml:mi mathvariant="italic">m</mml:mi> | |
| 219 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 220 | </mml:msub> | |
| 221 | </mml:mfenced> | |
| 222 | </mml:msup> | |
| 223 | <mml:mo>-</mml:mo> | |
| 224 | <mml:mn>1</mml:mn> | |
| 225 | </mml:mrow> | |
| 226 | </mml:mrow> | |
| 227 | </mml:math></inlineequation> | |
| 228 | </para> | |
| 229 | </para> | |
| 230 | <para> | |
| 231 | and | |
| 232 | <inlineequation><mml:math> | |
| 233 | <!-- eqn: ( m sub R , m sub G , m sub B , m sub A ): --> | |
| 234 | <mml:mfenced open="(" close=")"> | |
| 235 | <mml:msub><mml:mi mathvariant="italic">m</mml:mi> | |
| 236 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 237 | </mml:msub> | |
| 238 | <mml:msub><mml:mi mathvariant="italic">m</mml:mi> | |
| 239 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 240 | </mml:msub> | |
| 241 | <mml:msub><mml:mi mathvariant="italic">m</mml:mi> | |
| 242 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 243 | </mml:msub> | |
| 244 | <mml:msub><mml:mi mathvariant="italic">m</mml:mi> | |
| 245 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 246 | </mml:msub> | |
| 247 | </mml:mfenced> | |
| 248 | </mml:math></inlineequation> | |
| 249 | is the number of red, | |
| 250 | green, | |
| 251 | blue, | |
| 252 | and alpha bitplanes. | |
| 253 | </para> | |
| 254 | <para> | |
| 255 | Source and destination scale factors are referred to as | |
| 256 | <inlineequation><mml:math> | |
| 257 | <!-- eqn: ( s sub R , s sub G , s sub B , s sub A ): --> | |
| 258 | <mml:mfenced open="(" close=")"> | |
| 259 | <mml:msub><mml:mi mathvariant="italic">s</mml:mi> | |
| 260 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 261 | </mml:msub> | |
| 262 | <mml:msub><mml:mi mathvariant="italic">s</mml:mi> | |
| 263 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 264 | </mml:msub> | |
| 265 | <mml:msub><mml:mi mathvariant="italic">s</mml:mi> | |
| 266 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 267 | </mml:msub> | |
| 268 | <mml:msub><mml:mi mathvariant="italic">s</mml:mi> | |
| 269 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 270 | </mml:msub> | |
| 271 | </mml:mfenced> | |
| 272 | </mml:math></inlineequation> | |
| 273 | and | |
| 274 | <inlineequation><mml:math> | |
| 275 | <!-- eqn: ( d sub R , d sub G , d sub B , d sub A ): --> | |
| 276 | <mml:mfenced open="(" close=")"> | |
| 277 | <mml:msub><mml:mi mathvariant="italic">d</mml:mi> | |
| 278 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 279 | </mml:msub> | |
| 280 | <mml:msub><mml:mi mathvariant="italic">d</mml:mi> | |
| 281 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 282 | </mml:msub> | |
| 283 | <mml:msub><mml:mi mathvariant="italic">d</mml:mi> | |
| 284 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 285 | </mml:msub> | |
| 286 | <mml:msub><mml:mi mathvariant="italic">d</mml:mi> | |
| 287 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 288 | </mml:msub> | |
| 289 | </mml:mfenced> | |
| 290 | </mml:math></inlineequation>. | |
| 291 | All scale factors have range | |
| 292 | <inlineequation><mml:math> | |
| 293 | <!-- eqn: [0,1]: --> | |
| 294 | <mml:mfenced open="[" close="]"> | |
| 295 | <mml:mn>0</mml:mn> | |
| 296 | <mml:mn>1</mml:mn> | |
| 297 | </mml:mfenced> | |
| 298 | </mml:math></inlineequation>. | |
| 299 | </para> | |
| 300 | <para> | |
| 301 | </para> | |
| 302 | <informaltable frame="topbot"> | |
| 303 | <tgroup cols="3" align="left"> | |
| 304 | <colspec colwidth="3*" /> | |
| 305 | <colspec colwidth="2*" /> | |
| 306 | <colspec colwidth="1*" /> | |
| 307 | <thead> | |
| 308 | <row> | |
| 309 | <entry rowsep="1" align="left"><emphasis role="bold"> | |
| 310 | Parameter | |
| 311 | </emphasis></entry> | |
| 312 | <entry rowsep="1" align="left"><emphasis role="bold"> | |
| 313 | RGB Factor | |
| 314 | </emphasis></entry> | |
| 315 | <entry rowsep="1" align="left"><emphasis role="bold"> | |
| 316 | Alpha Factor | |
| 317 | </emphasis></entry> | |
| 318 | </row> | |
| 319 | </thead> | |
| 320 | <tbody> | |
| 321 | <row> | |
| 322 | <entry align="left"> | |
| 323 | <constant>GL_ZERO</constant> | |
| 324 | </entry> | |
| 325 | <entry align="left"> | |
| 326 | <inlineequation><mml:math> | |
| 327 | <!-- eqn: ( 0, 0, 0 ): --> | |
| 328 | <mml:mfenced open="(" close=")"> | |
| 329 | <mml:mn>0</mml:mn> | |
| 330 | <mml:mn>0</mml:mn> | |
| 331 | <mml:mn>0</mml:mn> | |
| 332 | </mml:mfenced> | |
| 333 | </mml:math></inlineequation> | |
| 334 | </entry> | |
| 335 | <entry align="left"> | |
| 336 | <inlineequation><mml:math> | |
| 337 | <!-- eqn: 0: --> | |
| 338 | <mml:mn>0</mml:mn> | |
| 339 | </mml:math></inlineequation> | |
| 340 | </entry> | |
| 341 | </row> | |
| 342 | <row> | |
| 343 | <entry align="left"> | |
| 344 | <constant>GL_ONE</constant> | |
| 345 | </entry> | |
| 346 | <entry align="left"> | |
| 347 | <inlineequation><mml:math> | |
| 348 | <!-- eqn: ( 1, 1, 1 ): --> | |
| 349 | <mml:mfenced open="(" close=")"> | |
| 350 | <mml:mn>1</mml:mn> | |
| 351 | <mml:mn>1</mml:mn> | |
| 352 | <mml:mn>1</mml:mn> | |
| 353 | </mml:mfenced> | |
| 354 | </mml:math></inlineequation> | |
| 355 | </entry> | |
| 356 | <entry align="left"> | |
| 357 | <inlineequation><mml:math> | |
| 358 | <!-- eqn: 1: --> | |
| 359 | <mml:mn>1</mml:mn> | |
| 360 | </mml:math></inlineequation> | |
| 361 | </entry> | |
| 362 | </row> | |
| 363 | <row> | |
| 364 | <entry align="left"> | |
| 365 | <constant>GL_SRC_COLOR</constant> | |
| 366 | </entry> | |
| 367 | <entry align="left"> | |
| 368 | <inlineequation><mml:math> | |
| 369 | <!-- eqn: ( R sub s0 / k sub R , G sub s0 / k sub G , B sub s0 / k sub B ): --> | |
| 370 | <mml:mfenced open="(" close=")"> | |
| 371 | <mml:mfrac> | |
| 372 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 373 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 374 | </mml:msub> | |
| 375 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 376 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 377 | </mml:msub> | |
| 378 | </mml:mfrac> | |
| 379 | <mml:mfrac> | |
| 380 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 381 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 382 | </mml:msub> | |
| 383 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 384 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 385 | </mml:msub> | |
| 386 | </mml:mfrac> | |
| 387 | <mml:mfrac> | |
| 388 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 389 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 390 | </mml:msub> | |
| 391 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 392 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 393 | </mml:msub> | |
| 394 | </mml:mfrac> | |
| 395 | </mml:mfenced> | |
| 396 | </mml:math></inlineequation> | |
| 397 | </entry> | |
| 398 | <entry align="left"> | |
| 399 | <inlineequation><mml:math> | |
| 400 | <!-- eqn: A sub s0 / k sub A: --> | |
| 401 | <mml:mfrac> | |
| 402 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 403 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 404 | </mml:msub> | |
| 405 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 406 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 407 | </mml:msub> | |
| 408 | </mml:mfrac> | |
| 409 | </mml:math></inlineequation> | |
| 410 | </entry> | |
| 411 | </row> | |
| 412 | <row> | |
| 413 | <entry align="left"> | |
| 414 | <constant>GL_ONE_MINUS_SRC_COLOR</constant> | |
| 415 | </entry> | |
| 416 | <entry align="left"> | |
| 417 | <inlineequation><mml:math> | |
| 418 | <!-- eqn: ( 1, 1, 1, 1 ) - ( R sub s0 / k sub R , G sub s0 / k sub G , B sub 0s / k sub B ): --> | |
| 419 | <mml:mrow> | |
| 420 | <mml:mfenced open="(" close=")"> | |
| 421 | <mml:mn>1</mml:mn> | |
| 422 | <mml:mn>1</mml:mn> | |
| 423 | <mml:mn>1</mml:mn> | |
| 424 | <mml:mn>1</mml:mn> | |
| 425 | </mml:mfenced> | |
| 426 | <mml:mo>-</mml:mo> | |
| 427 | <mml:mfenced open="(" close=")"> | |
| 428 | <mml:mfrac> | |
| 429 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 430 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 431 | </mml:msub> | |
| 432 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 433 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 434 | </mml:msub> | |
| 435 | </mml:mfrac> | |
| 436 | <mml:mfrac> | |
| 437 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 438 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 439 | </mml:msub> | |
| 440 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 441 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 442 | </mml:msub> | |
| 443 | </mml:mfrac> | |
| 444 | <mml:mfrac> | |
| 445 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 446 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 447 | </mml:msub> | |
| 448 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 449 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 450 | </mml:msub> | |
| 451 | </mml:mfrac> | |
| 452 | </mml:mfenced> | |
| 453 | </mml:mrow> | |
| 454 | </mml:math></inlineequation> | |
| 455 | </entry> | |
| 456 | <entry align="left"> | |
| 457 | <inlineequation><mml:math> | |
| 458 | <!-- eqn: 1 - A sub s0 / k sub A: --> | |
| 459 | <mml:mrow> | |
| 460 | <mml:mn>1</mml:mn> | |
| 461 | <mml:mo>-</mml:mo> | |
| 462 | <mml:mfrac> | |
| 463 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 464 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 465 | </mml:msub> | |
| 466 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 467 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 468 | </mml:msub> | |
| 469 | </mml:mfrac> | |
| 470 | </mml:mrow> | |
| 471 | </mml:math></inlineequation> | |
| 472 | </entry> | |
| 473 | </row> | |
| 474 | <row> | |
| 475 | <entry align="left"> | |
| 476 | <constant>GL_DST_COLOR</constant> | |
| 477 | </entry> | |
| 478 | <entry align="left"> | |
| 479 | <inlineequation><mml:math> | |
| 480 | <!-- eqn: ( R sub d / k sub R , G sub d / k sub G , B sub d / k sub B ): --> | |
| 481 | <mml:mfenced open="(" close=")"> | |
| 482 | <mml:mfrac> | |
| 483 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 484 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 485 | </mml:msub> | |
| 486 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 487 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 488 | </mml:msub> | |
| 489 | </mml:mfrac> | |
| 490 | <mml:mfrac> | |
| 491 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 492 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 493 | </mml:msub> | |
| 494 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 495 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 496 | </mml:msub> | |
| 497 | </mml:mfrac> | |
| 498 | <mml:mfrac> | |
| 499 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 500 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 501 | </mml:msub> | |
| 502 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 503 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 504 | </mml:msub> | |
| 505 | </mml:mfrac> | |
| 506 | </mml:mfenced> | |
| 507 | </mml:math></inlineequation> | |
| 508 | </entry> | |
| 509 | <entry align="left"> | |
| 510 | <inlineequation><mml:math> | |
| 511 | <!-- eqn: A sub d / k sub A: --> | |
| 512 | <mml:mfrac> | |
| 513 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 514 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 515 | </mml:msub> | |
| 516 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 517 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 518 | </mml:msub> | |
| 519 | </mml:mfrac> | |
| 520 | </mml:math></inlineequation> | |
| 521 | </entry> | |
| 522 | </row> | |
| 523 | <row> | |
| 524 | <entry align="left"> | |
| 525 | <constant>GL_ONE_MINUS_DST_COLOR</constant> | |
| 526 | </entry> | |
| 527 | <entry align="left"> | |
| 528 | <inlineequation><mml:math> | |
| 529 | <!-- eqn: ( 1, 1, 1 ) - ( R sub d / k sub R , G sub d / k sub G , B sub d / k sub B ): --> | |
| 530 | <mml:mrow> | |
| 531 | <mml:mfenced open="(" close=")"> | |
| 532 | <mml:mn>1</mml:mn> | |
| 533 | <mml:mn>1</mml:mn> | |
| 534 | <mml:mn>1</mml:mn> | |
| 535 | </mml:mfenced> | |
| 536 | <mml:mo>-</mml:mo> | |
| 537 | <mml:mfenced open="(" close=")"> | |
| 538 | <mml:mfrac> | |
| 539 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 540 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 541 | </mml:msub> | |
| 542 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 543 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 544 | </mml:msub> | |
| 545 | </mml:mfrac> | |
| 546 | <mml:mfrac> | |
| 547 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 548 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 549 | </mml:msub> | |
| 550 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 551 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 552 | </mml:msub> | |
| 553 | </mml:mfrac> | |
| 554 | <mml:mfrac> | |
| 555 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 556 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 557 | </mml:msub> | |
| 558 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 559 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 560 | </mml:msub> | |
| 561 | </mml:mfrac> | |
| 562 | </mml:mfenced> | |
| 563 | </mml:mrow> | |
| 564 | </mml:math></inlineequation> | |
| 565 | </entry> | |
| 566 | <entry align="left"> | |
| 567 | <inlineequation><mml:math> | |
| 568 | <!-- eqn: 1 - A sub d / k sub A: --> | |
| 569 | <mml:mrow> | |
| 570 | <mml:mn>1</mml:mn> | |
| 571 | <mml:mo>-</mml:mo> | |
| 572 | <mml:mfrac> | |
| 573 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 574 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 575 | </mml:msub> | |
| 576 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 577 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 578 | </mml:msub> | |
| 579 | </mml:mfrac> | |
| 580 | </mml:mrow> | |
| 581 | </mml:math></inlineequation> | |
| 582 | </entry> | |
| 583 | </row> | |
| 584 | <row> | |
| 585 | <entry align="left"> | |
| 586 | <constant>GL_SRC_ALPHA</constant> | |
| 587 | </entry> | |
| 588 | <entry align="left"> | |
| 589 | <inlineequation><mml:math> | |
| 590 | <!-- eqn: ( A sub s0 / k sub A , A sub s0 / k sub A , A sub s0 / k sub A ): --> | |
| 591 | <mml:mfenced open="(" close=")"> | |
| 592 | <mml:mfrac> | |
| 593 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 594 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 595 | </mml:msub> | |
| 596 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 597 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 598 | </mml:msub> | |
| 599 | </mml:mfrac> | |
| 600 | <mml:mfrac> | |
| 601 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 602 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 603 | </mml:msub> | |
| 604 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 605 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 606 | </mml:msub> | |
| 607 | </mml:mfrac> | |
| 608 | <mml:mfrac> | |
| 609 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 610 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 611 | </mml:msub> | |
| 612 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 613 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 614 | </mml:msub> | |
| 615 | </mml:mfrac> | |
| 616 | </mml:mfenced> | |
| 617 | </mml:math></inlineequation> | |
| 618 | </entry> | |
| 619 | <entry align="left"> | |
| 620 | <inlineequation><mml:math> | |
| 621 | <!-- eqn: A sub s / k sub A: --> | |
| 622 | <mml:mfrac> | |
| 623 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 624 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 625 | </mml:msub> | |
| 626 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 627 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 628 | </mml:msub> | |
| 629 | </mml:mfrac> | |
| 630 | </mml:math></inlineequation> | |
| 631 | </entry> | |
| 632 | </row> | |
| 633 | <row> | |
| 634 | <entry align="left"> | |
| 635 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
| 636 | </entry> | |
| 637 | <entry align="left"> | |
| 638 | <inlineequation><mml:math> | |
| 639 | <!-- eqn: ( 1, 1, 1 ) - ( A sub s0 / k sub A , A sub s0 / k sub A , A sub s0 / k sub A ): --> | |
| 640 | <mml:mrow> | |
| 641 | <mml:mfenced open="(" close=")"> | |
| 642 | <mml:mn>1</mml:mn> | |
| 643 | <mml:mn>1</mml:mn> | |
| 644 | <mml:mn>1</mml:mn> | |
| 645 | </mml:mfenced> | |
| 646 | <mml:mo>-</mml:mo> | |
| 647 | <mml:mfenced open="(" close=")"> | |
| 648 | <mml:mfrac> | |
| 649 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 650 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 651 | </mml:msub> | |
| 652 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 653 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 654 | </mml:msub> | |
| 655 | </mml:mfrac> | |
| 656 | <mml:mfrac> | |
| 657 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 658 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 659 | </mml:msub> | |
| 660 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 661 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 662 | </mml:msub> | |
| 663 | </mml:mfrac> | |
| 664 | <mml:mfrac> | |
| 665 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 666 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 667 | </mml:msub> | |
| 668 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 669 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 670 | </mml:msub> | |
| 671 | </mml:mfrac> | |
| 672 | </mml:mfenced> | |
| 673 | </mml:mrow> | |
| 674 | </mml:math></inlineequation> | |
| 675 | </entry> | |
| 676 | <entry align="left"> | |
| 677 | <inlineequation><mml:math> | |
| 678 | <!-- eqn: 1 - A sub s / k sub A: --> | |
| 679 | <mml:mrow> | |
| 680 | <mml:mn>1</mml:mn> | |
| 681 | <mml:mo>-</mml:mo> | |
| 682 | <mml:mfrac> | |
| 683 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 684 | <mml:mi mathvariant="italic">s0</mml:mi> | |
| 685 | </mml:msub> | |
| 686 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 687 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 688 | </mml:msub> | |
| 689 | </mml:mfrac> | |
| 690 | </mml:mrow> | |
| 691 | </mml:math></inlineequation> | |
| 692 | </entry> | |
| 693 | </row> | |
| 694 | <row> | |
| 695 | <entry align="left"> | |
| 696 | <constant>GL_DST_ALPHA</constant> | |
| 697 | </entry> | |
| 698 | <entry align="left"> | |
| 699 | <inlineequation><mml:math> | |
| 700 | <!-- eqn: ( A sub d / k sub A , A sub d / k sub A , A sub d / k sub A ): --> | |
| 701 | <mml:mfenced open="(" close=")"> | |
| 702 | <mml:mfrac> | |
| 703 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 704 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 705 | </mml:msub> | |
| 706 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 707 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 708 | </mml:msub> | |
| 709 | </mml:mfrac> | |
| 710 | <mml:mfrac> | |
| 711 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 712 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 713 | </mml:msub> | |
| 714 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 715 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 716 | </mml:msub> | |
| 717 | </mml:mfrac> | |
| 718 | <mml:mfrac> | |
| 719 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 720 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 721 | </mml:msub> | |
| 722 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 723 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 724 | </mml:msub> | |
| 725 | </mml:mfrac> | |
| 726 | </mml:mfenced> | |
| 727 | </mml:math></inlineequation> | |
| 728 | </entry> | |
| 729 | <entry align="left"> | |
| 730 | <inlineequation><mml:math> | |
| 731 | <!-- eqn: A sub d / k sub A: --> | |
| 732 | <mml:mfrac> | |
| 733 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 734 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 735 | </mml:msub> | |
| 736 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 737 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 738 | </mml:msub> | |
| 739 | </mml:mfrac> | |
| 740 | </mml:math></inlineequation> | |
| 741 | </entry> | |
| 742 | </row> | |
| 743 | <row> | |
| 744 | <entry align="left"> | |
| 745 | <constant>GL_ONE_MINUS_DST_ALPHA</constant> | |
| 746 | </entry> | |
| 747 | <entry align="left"> | |
| 748 | <inlineequation><mml:math> | |
| 749 | <!-- eqn: ( 1, 1, 1 ) - ( A sub d / k sub A , A sub d / k sub A , A sub d / k sub A ): --> | |
| 750 | <mml:mrow> | |
| 751 | <mml:mfenced open="(" close=")"> | |
| 752 | <mml:mn>1</mml:mn> | |
| 753 | <mml:mn>1</mml:mn> | |
| 754 | <mml:mn>1</mml:mn> | |
| 755 | </mml:mfenced> | |
| 756 | <mml:mo>-</mml:mo> | |
| 757 | <mml:mfenced open="(" close=")"> | |
| 758 | <mml:mfrac> | |
| 759 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 760 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 761 | </mml:msub> | |
| 762 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 763 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 764 | </mml:msub> | |
| 765 | </mml:mfrac> | |
| 766 | <mml:mfrac> | |
| 767 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 768 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 769 | </mml:msub> | |
| 770 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 771 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 772 | </mml:msub> | |
| 773 | </mml:mfrac> | |
| 774 | <mml:mfrac> | |
| 775 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 776 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 777 | </mml:msub> | |
| 778 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 779 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 780 | </mml:msub> | |
| 781 | </mml:mfrac> | |
| 782 | </mml:mfenced> | |
| 783 | </mml:mrow> | |
| 784 | </mml:math></inlineequation> | |
| 785 | </entry> | |
| 786 | <entry align="left"> | |
| 787 | <inlineequation><mml:math> | |
| 788 | <!-- eqn: 1 - A sub d / k sub A: --> | |
| 789 | <mml:mrow> | |
| 790 | <mml:mn>1</mml:mn> | |
| 791 | <mml:mo>-</mml:mo> | |
| 792 | <mml:mfrac> | |
| 793 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 794 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 795 | </mml:msub> | |
| 796 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 797 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 798 | </mml:msub> | |
| 799 | </mml:mfrac> | |
| 800 | </mml:mrow> | |
| 801 | </mml:math></inlineequation> | |
| 802 | </entry> | |
| 803 | </row> | |
| 804 | <row> | |
| 805 | <entry align="left"> | |
| 806 | <constant>GL_CONSTANT_COLOR</constant> | |
| 807 | </entry> | |
| 808 | <entry align="left"> | |
| 809 | <inlineequation><mml:math> | |
| 810 | <!-- eqn: ( R sub c, G sub c, B sub c ): --> | |
| 811 | <mml:mfenced open="(" close=")"> | |
| 812 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 813 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 814 | </mml:msub> | |
| 815 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 816 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 817 | </mml:msub> | |
| 818 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 819 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 820 | </mml:msub> | |
| 821 | </mml:mfenced> | |
| 822 | </mml:math></inlineequation> | |
| 823 | </entry> | |
| 824 | <entry align="left"> | |
| 825 | <inlineequation><mml:math> | |
| 826 | <!-- eqn: A sub c: --> | |
| 827 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 828 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 829 | </mml:msub> | |
| 830 | </mml:math></inlineequation> | |
| 831 | </entry> | |
| 832 | </row> | |
| 833 | <row> | |
| 834 | <entry align="left"> | |
| 835 | <constant>GL_ONE_MINUS_CONSTANT_COLOR</constant> | |
| 836 | </entry> | |
| 837 | <entry align="left"> | |
| 838 | <inlineequation><mml:math> | |
| 839 | <!-- eqn: ( 1, 1, 1 ) - ( R sub c, G sub c, B sub c ): --> | |
| 840 | <mml:mrow> | |
| 841 | <mml:mfenced open="(" close=")"> | |
| 842 | <mml:mn>1</mml:mn> | |
| 843 | <mml:mn>1</mml:mn> | |
| 844 | <mml:mn>1</mml:mn> | |
| 845 | </mml:mfenced> | |
| 846 | <mml:mo>-</mml:mo> | |
| 847 | <mml:mfenced open="(" close=")"> | |
| 848 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 849 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 850 | </mml:msub> | |
| 851 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 852 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 853 | </mml:msub> | |
| 854 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 855 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 856 | </mml:msub> | |
| 857 | </mml:mfenced> | |
| 858 | </mml:mrow> | |
| 859 | </mml:math></inlineequation> | |
| 860 | </entry> | |
| 861 | <entry align="left"> | |
| 862 | <inlineequation><mml:math> | |
| 863 | <!-- eqn: 1 - A sub c: --> | |
| 864 | <mml:mrow> | |
| 865 | <mml:mn>1</mml:mn> | |
| 866 | <mml:mo>-</mml:mo> | |
| 867 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 868 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 869 | </mml:msub> | |
| 870 | </mml:mrow> | |
| 871 | </mml:math></inlineequation> | |
| 872 | </entry> | |
| 873 | </row> | |
| 874 | <row> | |
| 875 | <entry align="left"> | |
| 876 | <constant>GL_CONSTANT_ALPHA</constant> | |
| 877 | </entry> | |
| 878 | <entry align="left"> | |
| 879 | <inlineequation><mml:math> | |
| 880 | <!-- eqn: ( A sub c, A sub c, A sub c ): --> | |
| 881 | <mml:mfenced open="(" close=")"> | |
| 882 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 883 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 884 | </mml:msub> | |
| 885 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 886 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 887 | </mml:msub> | |
| 888 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 889 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 890 | </mml:msub> | |
| 891 | </mml:mfenced> | |
| 892 | </mml:math></inlineequation> | |
| 893 | </entry> | |
| 894 | <entry align="left"> | |
| 895 | <inlineequation><mml:math> | |
| 896 | <!-- eqn: A sub c: --> | |
| 897 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 898 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 899 | </mml:msub> | |
| 900 | </mml:math></inlineequation> | |
| 901 | </entry> | |
| 902 | </row> | |
| 903 | <row> | |
| 904 | <entry align="left"> | |
| 905 | <constant>GL_ONE_MINUS_CONSTANT_ALPHA</constant> | |
| 906 | </entry> | |
| 907 | <entry align="left"> | |
| 908 | <inlineequation><mml:math> | |
| 909 | <!-- eqn: ( 1, 1, 1 ) - ( A sub c, A sub c, A sub c ): --> | |
| 910 | <mml:mrow> | |
| 911 | <mml:mfenced open="(" close=")"> | |
| 912 | <mml:mn>1</mml:mn> | |
| 913 | <mml:mn>1</mml:mn> | |
| 914 | <mml:mn>1</mml:mn> | |
| 915 | </mml:mfenced> | |
| 916 | <mml:mo>-</mml:mo> | |
| 917 | <mml:mfenced open="(" close=")"> | |
| 918 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 919 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 920 | </mml:msub> | |
| 921 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 922 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 923 | </mml:msub> | |
| 924 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 925 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 926 | </mml:msub> | |
| 927 | </mml:mfenced> | |
| 928 | </mml:mrow> | |
| 929 | </mml:math></inlineequation> | |
| 930 | </entry> | |
| 931 | <entry align="left"> | |
| 932 | <inlineequation><mml:math> | |
| 933 | <!-- eqn: 1 - A sub c: --> | |
| 934 | <mml:mrow> | |
| 935 | <mml:mn>1</mml:mn> | |
| 936 | <mml:mo>-</mml:mo> | |
| 937 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 938 | <mml:mi mathvariant="italic">c</mml:mi> | |
| 939 | </mml:msub> | |
| 940 | </mml:mrow> | |
| 941 | </mml:math></inlineequation> | |
| 942 | </entry> | |
| 943 | </row> | |
| 944 | <row> | |
| 945 | <entry align="left"> | |
| 946 | <constant>GL_SRC_ALPHA_SATURATE</constant> | |
| 947 | </entry> | |
| 948 | <entry align="left"> | |
| 949 | <inlineequation><mml:math> | |
| 950 | <!-- eqn: ( i, i, i ): --> | |
| 951 | <mml:mfenced open="(" close=")"> | |
| 952 | <mml:mi mathvariant="italic">i</mml:mi> | |
| 953 | <mml:mi mathvariant="italic">i</mml:mi> | |
| 954 | <mml:mi mathvariant="italic">i</mml:mi> | |
| 955 | </mml:mfenced> | |
| 956 | </mml:math></inlineequation> | |
| 957 | </entry> | |
| 958 | <entry align="left"> | |
| 959 | <inlineequation><mml:math> | |
| 960 | <!-- eqn: 1: --> | |
| 961 | <mml:mn>1</mml:mn> | |
| 962 | </mml:math></inlineequation> | |
| 963 | </entry> | |
| 964 | </row> | |
| 965 | <row> | |
| 966 | <entry align="left"> | |
| 967 | <constant>GL_SRC1_COLOR</constant> | |
| 968 | </entry> | |
| 969 | <entry align="left"> | |
| 970 | <inlineequation><mml:math> | |
| 971 | <!-- eqn: ( R sub s1 / k sub R , G sub s1 / k sub G , B sub s1 / k sub B ): --> | |
| 972 | <mml:mfenced open="(" close=")"> | |
| 973 | <mml:mfrac> | |
| 974 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 975 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 976 | </mml:msub> | |
| 977 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 978 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 979 | </mml:msub> | |
| 980 | </mml:mfrac> | |
| 981 | <mml:mfrac> | |
| 982 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 983 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 984 | </mml:msub> | |
| 985 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 986 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 987 | </mml:msub> | |
| 988 | </mml:mfrac> | |
| 989 | <mml:mfrac> | |
| 990 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 991 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 992 | </mml:msub> | |
| 993 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 994 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 995 | </mml:msub> | |
| 996 | </mml:mfrac> | |
| 997 | </mml:mfenced> | |
| 998 | </mml:math></inlineequation> | |
| 999 | </entry> | |
| 1000 | <entry align="left"> | |
| 1001 | <inlineequation><mml:math> | |
| 1002 | <!-- eqn: A sub s0 / k sub A: --> | |
| 1003 | <mml:mfrac> | |
| 1004 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1005 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1006 | </mml:msub> | |
| 1007 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1008 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1009 | </mml:msub> | |
| 1010 | </mml:mfrac> | |
| 1011 | </mml:math></inlineequation> | |
| 1012 | </entry> | |
| 1013 | </row> | |
| 1014 | <row> | |
| 1015 | <entry align="left"> | |
| 1016 | <constant>GL_ONE_MINUS_SRC_COLOR</constant> | |
| 1017 | </entry> | |
| 1018 | <entry align="left"> | |
| 1019 | <inlineequation><mml:math> | |
| 1020 | <!-- eqn: ( 1, 1, 1, 1 ) - ( R sub s1 / k sub R , G sub s1 / k sub G , B sub s1 / k sub B ): --> | |
| 1021 | <mml:mrow> | |
| 1022 | <mml:mfenced open="(" close=")"> | |
| 1023 | <mml:mn>1</mml:mn> | |
| 1024 | <mml:mn>1</mml:mn> | |
| 1025 | <mml:mn>1</mml:mn> | |
| 1026 | <mml:mn>1</mml:mn> | |
| 1027 | </mml:mfenced> | |
| 1028 | <mml:mo>-</mml:mo> | |
| 1029 | <mml:mfenced open="(" close=")"> | |
| 1030 | <mml:mfrac> | |
| 1031 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 1032 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1033 | </mml:msub> | |
| 1034 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1035 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 1036 | </mml:msub> | |
| 1037 | </mml:mfrac> | |
| 1038 | <mml:mfrac> | |
| 1039 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 1040 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1041 | </mml:msub> | |
| 1042 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1043 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 1044 | </mml:msub> | |
| 1045 | </mml:mfrac> | |
| 1046 | <mml:mfrac> | |
| 1047 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 1048 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1049 | </mml:msub> | |
| 1050 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1051 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 1052 | </mml:msub> | |
| 1053 | </mml:mfrac> | |
| 1054 | </mml:mfenced> | |
| 1055 | </mml:mrow> | |
| 1056 | </mml:math></inlineequation> | |
| 1057 | </entry> | |
| 1058 | <entry align="left"> | |
| 1059 | <inlineequation><mml:math> | |
| 1060 | <!-- eqn: 1 - A sub s0 / k sub A: --> | |
| 1061 | <mml:mrow> | |
| 1062 | <mml:mn>1</mml:mn> | |
| 1063 | <mml:mo>-</mml:mo> | |
| 1064 | <mml:mfrac> | |
| 1065 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1066 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1067 | </mml:msub> | |
| 1068 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1069 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1070 | </mml:msub> | |
| 1071 | </mml:mfrac> | |
| 1072 | </mml:mrow> | |
| 1073 | </mml:math></inlineequation> | |
| 1074 | </entry> | |
| 1075 | </row> | |
| 1076 | <row> | |
| 1077 | <entry align="left"> | |
| 1078 | <constant>GL_SRC1_ALPHA</constant> | |
| 1079 | </entry> | |
| 1080 | <entry align="left"> | |
| 1081 | <inlineequation><mml:math> | |
| 1082 | <!-- eqn: ( A sub s1 / k sub A , A sub s1 / k sub A , A sub s1 / k sub A ): --> | |
| 1083 | <mml:mfenced open="(" close=")"> | |
| 1084 | <mml:mfrac> | |
| 1085 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1086 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1087 | </mml:msub> | |
| 1088 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1089 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1090 | </mml:msub> | |
| 1091 | </mml:mfrac> | |
| 1092 | <mml:mfrac> | |
| 1093 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1094 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1095 | </mml:msub> | |
| 1096 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1097 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1098 | </mml:msub> | |
| 1099 | </mml:mfrac> | |
| 1100 | <mml:mfrac> | |
| 1101 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1102 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1103 | </mml:msub> | |
| 1104 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1105 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1106 | </mml:msub> | |
| 1107 | </mml:mfrac> | |
| 1108 | </mml:mfenced> | |
| 1109 | </mml:math></inlineequation> | |
| 1110 | </entry> | |
| 1111 | <entry align="left"> | |
| 1112 | <inlineequation><mml:math> | |
| 1113 | <!-- eqn: A sub s1 / k sub A: --> | |
| 1114 | <mml:mfrac> | |
| 1115 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1116 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1117 | </mml:msub> | |
| 1118 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1119 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1120 | </mml:msub> | |
| 1121 | </mml:mfrac> | |
| 1122 | </mml:math></inlineequation> | |
| 1123 | </entry> | |
| 1124 | </row> | |
| 1125 | <row> | |
| 1126 | <entry align="left"> | |
| 1127 | <constant>GL_ONE_MINUS_SRC_ALPHA</constant> | |
| 1128 | </entry> | |
| 1129 | <entry align="left"> | |
| 1130 | <inlineequation><mml:math> | |
| 1131 | <!-- eqn: ( 1, 1, 1 ) - ( A sub s1 / k sub A , A sub s1 / k sub A , A sub s1 / k sub A ): --> | |
| 1132 | <mml:mrow> | |
| 1133 | <mml:mfenced open="(" close=")"> | |
| 1134 | <mml:mn>1</mml:mn> | |
| 1135 | <mml:mn>1</mml:mn> | |
| 1136 | <mml:mn>1</mml:mn> | |
| 1137 | </mml:mfenced> | |
| 1138 | <mml:mo>-</mml:mo> | |
| 1139 | <mml:mfenced open="(" close=")"> | |
| 1140 | <mml:mfrac> | |
| 1141 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1142 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1143 | </mml:msub> | |
| 1144 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1145 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1146 | </mml:msub> | |
| 1147 | </mml:mfrac> | |
| 1148 | <mml:mfrac> | |
| 1149 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1150 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1151 | </mml:msub> | |
| 1152 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1153 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1154 | </mml:msub> | |
| 1155 | </mml:mfrac> | |
| 1156 | <mml:mfrac> | |
| 1157 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1158 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1159 | </mml:msub> | |
| 1160 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1161 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1162 | </mml:msub> | |
| 1163 | </mml:mfrac> | |
| 1164 | </mml:mfenced> | |
| 1165 | </mml:mrow> | |
| 1166 | </mml:math></inlineequation> | |
| 1167 | </entry> | |
| 1168 | <entry align="left"> | |
| 1169 | <inlineequation><mml:math> | |
| 1170 | <!-- eqn: 1 - A sub s1 / k sub A: --> | |
| 1171 | <mml:mrow> | |
| 1172 | <mml:mn>1</mml:mn> | |
| 1173 | <mml:mo>-</mml:mo> | |
| 1174 | <mml:mfrac> | |
| 1175 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1176 | <mml:mi mathvariant="italic">s1</mml:mi> | |
| 1177 | </mml:msub> | |
| 1178 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1179 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1180 | </mml:msub> | |
| 1181 | </mml:mfrac> | |
| 1182 | </mml:mrow> | |
| 1183 | </mml:math></inlineequation> | |
| 1184 | </entry> | |
| 1185 | </row> | |
| 1186 | </tbody> | |
| 1187 | </tgroup> | |
| 1188 | </informaltable> | |
| 1189 | <para> | |
| 1190 | In the table, | |
| 1191 | </para> | |
| 1192 | <para> | |
| 1193 | <para> | |
| 1194 | <inlineequation><mml:math> | |
| 1195 | <!-- eqn: i = min (A sub s , 1 - {A sub d}): --> | |
| 1196 | <mml:mrow> | |
| 1197 | <mml:mi mathvariant="italic">i</mml:mi> | |
| 1198 | <mml:mo>=</mml:mo> | |
| 1199 | <mml:mrow> | |
| 1200 | <mml:mi mathvariant="italic">min</mml:mi> | |
| 1201 | <mml:mo>⁡</mml:mo> | |
| 1202 | <mml:mfenced open="(" close=")"> | |
| 1203 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1204 | <mml:mi mathvariant="italic">s</mml:mi> | |
| 1205 | </mml:msub> | |
| 1206 | <mml:mrow> | |
| 1207 | <mml:mn>1</mml:mn> | |
| 1208 | <mml:mo>-</mml:mo> | |
| 1209 | <mml:mfenced open="" close=""> | |
| 1210 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1211 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1212 | </mml:msub> | |
| 1213 | </mml:mfenced> | |
| 1214 | </mml:mrow> | |
| 1215 | </mml:mfenced> | |
| 1216 | </mml:mrow> | |
| 1217 | </mml:mrow> | |
| 1218 | </mml:math></inlineequation> | |
| 1219 | </para> | |
| 1220 | </para> | |
| 1221 | <para> | |
| 1222 | To determine the blended RGBA values of a pixel, | |
| 1223 | the system uses the following equations: | |
| 1224 | </para> | |
| 1225 | <para> | |
| 1226 | <para> | |
| 1227 | <inlineequation><mml:math> | |
| 1228 | <!-- eqn: R sub d = min ( k sub R, R sub s s sub R + R sub d d sub R ): --> | |
| 1229 | <mml:mrow> | |
| 1230 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 1231 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1232 | </mml:msub> | |
| 1233 | <mml:mo>=</mml:mo> | |
| 1234 | <mml:mrow> | |
| 1235 | <mml:mi mathvariant="italic">min</mml:mi> | |
| 1236 | <mml:mo>⁡</mml:mo> | |
| 1237 | <mml:mfenced open="(" close=")"> | |
| 1238 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1239 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 1240 | </mml:msub> | |
| 1241 | <mml:mrow> | |
| 1242 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 1243 | <mml:mi mathvariant="italic">s</mml:mi> | |
| 1244 | </mml:msub> | |
| 1245 | <mml:mo>⁢</mml:mo> | |
| 1246 | <mml:msub><mml:mi mathvariant="italic">s</mml:mi> | |
| 1247 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 1248 | </mml:msub> | |
| 1249 | <mml:mo>+</mml:mo> | |
| 1250 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 1251 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1252 | </mml:msub> | |
| 1253 | <mml:mo>⁢</mml:mo> | |
| 1254 | <mml:msub><mml:mi mathvariant="italic">d</mml:mi> | |
| 1255 | <mml:mi mathvariant="italic">R</mml:mi> | |
| 1256 | </mml:msub> | |
| 1257 | </mml:mrow> | |
| 1258 | </mml:mfenced> | |
| 1259 | </mml:mrow> | |
| 1260 | </mml:mrow> | |
| 1261 | </mml:math></inlineequation> | |
| 1262 | <inlineequation><mml:math> | |
| 1263 | <!-- eqn: G sub d = min ( k sub G, G sub s s sub G + G sub d d sub G ): --> | |
| 1264 | <mml:mrow> | |
| 1265 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 1266 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1267 | </mml:msub> | |
| 1268 | <mml:mo>=</mml:mo> | |
| 1269 | <mml:mrow> | |
| 1270 | <mml:mi mathvariant="italic">min</mml:mi> | |
| 1271 | <mml:mo>⁡</mml:mo> | |
| 1272 | <mml:mfenced open="(" close=")"> | |
| 1273 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1274 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 1275 | </mml:msub> | |
| 1276 | <mml:mrow> | |
| 1277 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 1278 | <mml:mi mathvariant="italic">s</mml:mi> | |
| 1279 | </mml:msub> | |
| 1280 | <mml:mo>⁢</mml:mo> | |
| 1281 | <mml:msub><mml:mi mathvariant="italic">s</mml:mi> | |
| 1282 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 1283 | </mml:msub> | |
| 1284 | <mml:mo>+</mml:mo> | |
| 1285 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 1286 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1287 | </mml:msub> | |
| 1288 | <mml:mo>⁢</mml:mo> | |
| 1289 | <mml:msub><mml:mi mathvariant="italic">d</mml:mi> | |
| 1290 | <mml:mi mathvariant="italic">G</mml:mi> | |
| 1291 | </mml:msub> | |
| 1292 | </mml:mrow> | |
| 1293 | </mml:mfenced> | |
| 1294 | </mml:mrow> | |
| 1295 | </mml:mrow> | |
| 1296 | </mml:math></inlineequation> | |
| 1297 | <inlineequation><mml:math> | |
| 1298 | <!-- eqn: B sub d = min ( k sub B, B sub s s sub B + B sub d d sub B ): --> | |
| 1299 | <mml:mrow> | |
| 1300 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 1301 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1302 | </mml:msub> | |
| 1303 | <mml:mo>=</mml:mo> | |
| 1304 | <mml:mrow> | |
| 1305 | <mml:mi mathvariant="italic">min</mml:mi> | |
| 1306 | <mml:mo>⁡</mml:mo> | |
| 1307 | <mml:mfenced open="(" close=")"> | |
| 1308 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1309 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 1310 | </mml:msub> | |
| 1311 | <mml:mrow> | |
| 1312 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 1313 | <mml:mi mathvariant="italic">s</mml:mi> | |
| 1314 | </mml:msub> | |
| 1315 | <mml:mo>⁢</mml:mo> | |
| 1316 | <mml:msub><mml:mi mathvariant="italic">s</mml:mi> | |
| 1317 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 1318 | </mml:msub> | |
| 1319 | <mml:mo>+</mml:mo> | |
| 1320 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 1321 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1322 | </mml:msub> | |
| 1323 | <mml:mo>⁢</mml:mo> | |
| 1324 | <mml:msub><mml:mi mathvariant="italic">d</mml:mi> | |
| 1325 | <mml:mi mathvariant="italic">B</mml:mi> | |
| 1326 | </mml:msub> | |
| 1327 | </mml:mrow> | |
| 1328 | </mml:mfenced> | |
| 1329 | </mml:mrow> | |
| 1330 | </mml:mrow> | |
| 1331 | </mml:math></inlineequation> | |
| 1332 | <inlineequation><mml:math> | |
| 1333 | <!-- eqn: A sub d = min ( k sub A, A sub s s sub A + A sub d d sub A ): --> | |
| 1334 | <mml:mrow> | |
| 1335 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1336 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1337 | </mml:msub> | |
| 1338 | <mml:mo>=</mml:mo> | |
| 1339 | <mml:mrow> | |
| 1340 | <mml:mi mathvariant="italic">min</mml:mi> | |
| 1341 | <mml:mo>⁡</mml:mo> | |
| 1342 | <mml:mfenced open="(" close=")"> | |
| 1343 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1344 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1345 | </mml:msub> | |
| 1346 | <mml:mrow> | |
| 1347 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1348 | <mml:mi mathvariant="italic">s</mml:mi> | |
| 1349 | </mml:msub> | |
| 1350 | <mml:mo>⁢</mml:mo> | |
| 1351 | <mml:msub><mml:mi mathvariant="italic">s</mml:mi> | |
| 1352 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1353 | </mml:msub> | |
| 1354 | <mml:mo>+</mml:mo> | |
| 1355 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1356 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1357 | </mml:msub> | |
| 1358 | <mml:mo>⁢</mml:mo> | |
| 1359 | <mml:msub><mml:mi mathvariant="italic">d</mml:mi> | |
| 1360 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1361 | </mml:msub> | |
| 1362 | </mml:mrow> | |
| 1363 | </mml:mfenced> | |
| 1364 | </mml:mrow> | |
| 1365 | </mml:mrow> | |
| 1366 | </mml:math></inlineequation> | |
| 1367 | </para> | |
| 1368 | </para> | |
| 1369 | <para> | |
| 1370 | Despite the apparent precision of the above equations, blending arithmetic | |
| 1371 | is not exactly specified, because blending operates with imprecise integer | |
| 1372 | color values. However, a blend factor that should be equal to 1 is | |
| 1373 | guaranteed not to modify its multiplicand, and a blend factor equal to 0 | |
| 1374 | reduces its multiplicand to 0. For example, when <parameter>srcRGB</parameter> is | |
| 1375 | <constant>GL_SRC_ALPHA</constant>, <parameter>dstRGB</parameter> is <constant>GL_ONE_MINUS_SRC_ALPHA</constant>, and | |
| 1376 | <inlineequation><mml:math> | |
| 1377 | <!-- eqn: A sub s: --> | |
| 1378 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1379 | <mml:mi mathvariant="italic">s</mml:mi> | |
| 1380 | </mml:msub> | |
| 1381 | </mml:math></inlineequation> | |
| 1382 | is | |
| 1383 | equal to | |
| 1384 | <inlineequation><mml:math> | |
| 1385 | <!-- eqn: k sub A: --> | |
| 1386 | <mml:msub><mml:mi mathvariant="italic">k</mml:mi> | |
| 1387 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1388 | </mml:msub> | |
| 1389 | </mml:math></inlineequation>, | |
| 1390 | the equations reduce to simple replacement: | |
| 1391 | </para> | |
| 1392 | <para> | |
| 1393 | <para> | |
| 1394 | <inlineequation><mml:math> | |
| 1395 | <!-- eqn: R sub d = R sub s: --> | |
| 1396 | <mml:mrow> | |
| 1397 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 1398 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1399 | </mml:msub> | |
| 1400 | <mml:mo>=</mml:mo> | |
| 1401 | <mml:msub><mml:mi mathvariant="italic">R</mml:mi> | |
| 1402 | <mml:mi mathvariant="italic">s</mml:mi> | |
| 1403 | </mml:msub> | |
| 1404 | </mml:mrow> | |
| 1405 | </mml:math></inlineequation> | |
| 1406 | <inlineequation><mml:math> | |
| 1407 | <!-- eqn: G sub d = G sub s: --> | |
| 1408 | <mml:mrow> | |
| 1409 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 1410 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1411 | </mml:msub> | |
| 1412 | <mml:mo>=</mml:mo> | |
| 1413 | <mml:msub><mml:mi mathvariant="italic">G</mml:mi> | |
| 1414 | <mml:mi mathvariant="italic">s</mml:mi> | |
| 1415 | </mml:msub> | |
| 1416 | </mml:mrow> | |
| 1417 | </mml:math></inlineequation> | |
| 1418 | <inlineequation><mml:math> | |
| 1419 | <!-- eqn: B sub d = B sub s: --> | |
| 1420 | <mml:mrow> | |
| 1421 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 1422 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1423 | </mml:msub> | |
| 1424 | <mml:mo>=</mml:mo> | |
| 1425 | <mml:msub><mml:mi mathvariant="italic">B</mml:mi> | |
| 1426 | <mml:mi mathvariant="italic">s</mml:mi> | |
| 1427 | </mml:msub> | |
| 1428 | </mml:mrow> | |
| 1429 | </mml:math></inlineequation> | |
| 1430 | <inlineequation><mml:math> | |
| 1431 | <!-- eqn: A sub d = A sub s: --> | |
| 1432 | <mml:mrow> | |
| 1433 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1434 | <mml:mi mathvariant="italic">d</mml:mi> | |
| 1435 | </mml:msub> | |
| 1436 | <mml:mo>=</mml:mo> | |
| 1437 | <mml:msub><mml:mi mathvariant="italic">A</mml:mi> | |
| 1438 | <mml:mi mathvariant="italic">s</mml:mi> | |
| 1439 | </mml:msub> | |
| 1440 | </mml:mrow> | |
| 1441 | </mml:math></inlineequation> | |
| 1442 | </para> | |
| 1443 | </para> | |
| 1444 | <para> | |
| 1445 | </para> | |
| 1446 | </refsect1> | |
| 1447 | <refsect1 id="notes"><title>Notes</title> | |
| 1448 | <para> | |
| 1449 | Incoming (source) alpha is correctly thought of as a material opacity, | |
| 1450 | ranging from 1.0 | |
| 1451 | (<inlineequation><mml:math> | |
| 1452 | <!-- eqn: K sub A: --> | |
| 1453 | <mml:msub><mml:mi mathvariant="italic">K</mml:mi> | |
| 1454 | <mml:mi mathvariant="italic">A</mml:mi> | |
| 1455 | </mml:msub> | |
| 1456 | </mml:math></inlineequation>), | |
| 1457 | representing complete opacity, | |
| 1458 | to 0.0 (0), representing complete | |
| 1459 | transparency. | |
| 1460 | </para> | |
| 1461 | <para> | |
| 1462 | When more than one color buffer is enabled for drawing, | |
| 1463 | the GL performs blending separately for each enabled buffer, | |
| 1464 | using the contents of that buffer for destination color. | |
| 1465 | (See <citerefentry><refentrytitle>glDrawBuffer</refentrytitle></citerefentry>.) | |
| 1466 | </para> | |
| 1467 | <para> | |
| 1468 | When dual source blending is enabled (i.e., one of the blend factors requiring | |
| 1469 | the second color input is used), the maximum number of enabled draw buffers | |
| 1470 | is given by <constant>GL_MAX_DUAL_SOURCE_DRAW_BUFFERS</constant>, which may | |
| 1471 | be lower than <constant>GL_MAX_DRAW_BUFFERS</constant>. | |
| 1472 | </para> | |
| 1473 | </refsect1> | |
| 1474 | <refsect1 id="errors"><title>Errors</title> | |
| 1475 | <para> | |
| 1476 | <constant>GL_INVALID_ENUM</constant> is generated if either <parameter>srcRGB</parameter> or <parameter>dstRGB</parameter> is not an | |
| 1477 | accepted value. | |
| 1478 | </para> | |
| 1479 | <para> | |
| 1480 | <constant>GL_INVALID_VALUE</constant> is generated by <function>glBlendFuncSeparatei</function> if <parameter>buf</parameter> is greater | |
| 1481 | than or equal to the value of <constant>GL_MAX_DRAW_BUFFERS</constant>. | |
| 1482 | </para> | |
| 1483 | </refsect1> | |
| 1484 | <refsect1 id="associatedgets"><title>Associated Gets</title> | |
| 1485 | <para> | |
| 1486 | <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_BLEND_SRC_RGB</constant> | |
| 1487 | </para> | |
| 1488 | <para> | |
| 1489 | <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_BLEND_SRC_ALPHA</constant> | |
| 1490 | </para> | |
| 1491 | <para> | |
| 1492 | <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_BLEND_DST_RGB</constant> | |
| 1493 | </para> | |
| 1494 | <para> | |
| 1495 | <citerefentry><refentrytitle>glGet</refentrytitle></citerefentry> with argument <constant>GL_BLEND_DST_ALPHA</constant> | |
| 1496 | </para> | |
| 1497 | <para> | |
| 1498 | <citerefentry><refentrytitle>glIsEnabled</refentrytitle></citerefentry> with argument <constant>GL_BLEND</constant> | |
| 1499 | </para> | |
| 1500 | <para> | |
| 1501 | </para> | |
| 1502 | </refsect1> | |
| 1503 | <refsect1 id="seealso"><title>See Also</title> | |
| 1504 | <para> | |
| 1505 | <citerefentry><refentrytitle>glBlendColor</refentrytitle></citerefentry>, | |
| 1506 | <citerefentry><refentrytitle>glBlendFunc</refentrytitle></citerefentry>, | |
| 1507 | <citerefentry><refentrytitle>glBlendEquation</refentrytitle></citerefentry>, | |
| 1508 | <citerefentry><refentrytitle>glClear</refentrytitle></citerefentry>, | |
| 1509 | <citerefentry><refentrytitle>glDrawBuffer</refentrytitle></citerefentry>, | |
| 1510 | <citerefentry><refentrytitle>glEnable</refentrytitle></citerefentry>, | |
| 1511 | <citerefentry><refentrytitle>glLogicOp</refentrytitle></citerefentry>, | |
| 1512 | <citerefentry><refentrytitle>glStencilFunc</refentrytitle></citerefentry> | |
| 1513 | </para> | |
| 1514 | </refsect1> | |
| 1515 | <refsect1 id="Copyright"><title>Copyright</title> | |
| 1516 | <para> | |
| 1517 | Copyright <trademark class="copyright"></trademark> 1991-2006 | |
| 1518 | Silicon Graphics, Inc. This document is licensed under the SGI | |
| 1519 | Free Software B License. For details, see | |
| 1520 | <ulink url="http://oss.sgi.com/projects/FreeB/">http://oss.sgi.com/projects/FreeB/</ulink>. | |
| 1521 | </para> | |
| 1522 | </refsect1> | |
| 1523 | </refentry> |