📄 accum.ps
字号:
3 f2576(GL_LOAD)X1 f2962(,)X3 f3031(GL_ADD)X1 f3360(,)X3 f3429(GL_MULT)X1 f3824(,)X3894(and)X3 f554 3684(GL_RETURN)N1 f1047(.)X554 3818(All)N677(accumulation)X1130(buffer)X1349(operations)X1705(are)X1826(limited)X2074(to)X2158(the)X2278(area)X2435(of)X2524(the)X2644(current)X2894(scissor)X3134(box)X3276(and)X3414(applied)X3672(identically)X554 3914(to)N638(the)X758(red,)X903(green,)X1124(blue,)X1304(and)X1442(alpha)X1638(components)X2047(of)X2136(each)X2306(pixel.)X2528(If)X2604(a)X3 f2662(glAccum)X1 f2987(operation)X3312(results)X3543(in)X3627(a)X3685(value)X3881(out-)X554 4010(side)N703(the)X821(range)X1020([)X9 f1047(-)X1 f1091(1,)X1171(1],)X1278(the)X1396(contents)X1683(of)X1770(an)X1866(accumulation)X2318(buffer)X2535(pixel)X2715(component)X3091(are)X3210(unde\256ned.)X554 4144(The)N699(operations)X1053(are)X1172(as)X1259(follows:)X3 f554 4278(GL_ACCUM)N1 f1114(Obtains)X1383(R,)X1476(G,)X1574(B,)X1668(and)X1805(A)X1884(values)X2110(from)X2287(the)X2406(buffer)X2624(currently)X2935(selected)X3215(for)X3330(reading)X3592(\(see)X3 f3743(glRead-)X1114 4374(Buffer)N1 f1337(\).)X1428(Each)X1613(component)X1993(value)X2191(is)X2268(divided)X2531(by)X2634($2)X2737(sup)X2871(n\303-\3031$,)X3115(where)X3335($n$)X3478(is)X3554(the)X3675(number)X3943(of)X1114 4470(bits)N1259(allocated)X1579(to)X1671(each)X1849(color)X2044(component)X2430(in)X2522(the)X2650(currently)X2970(selected)X3259(buffer.)X3526(The)X3681(result)X3890(is)X3974(a)X1114 4566(\257oating-point)N1581(value)X1787(in)X1881(the)X2011(range)X2222([0,)X2341(1],)X2460(which)X2688(is)X2773(multiplied)X3133(by)X2 f3244(value)X1 f3449(and)X3596(added)X3819(to)X3912(the)X1114 4662(corresponding)N1594(pixel)X1775(component)X2152(in)X2235(the)X2355(accumulation)X2809(buffer,)X3048(thereby)X3311(updating)X3613(the)X3733(accumu-)X1114 4758(lation)N1316(buffer.)X3 f554 4892(GL_LOAD)N1 f1114(Similar)X1375(to)X3 f1463(GL_ACCUM)X1 f1926(,)X1972(except)X2208(that)X2354(the)X2478(current)X2732(value)X2932(in)X3020(the)X3145(accumulation)X3604(buffer)X3828(is)X3908(not)X1114 4988(used)N1292(in)X1385(the)X1514(calculation)X1897(of)X1995(the)X2124(new)X2289(value.)X2534(That)X2712(is,)X2815(the)X2943(R,)X3046(G,)X3154(B,)X3257(and)X3403(A)X3491(values)X3726(from)X3912(the)X1114 5084(currently)N1437(selected)X1729(buffer)X1959(are)X2091(divided)X2364(by)X2477($)X2550(2)X2623(sup)X2767(n\303-\3031$,)X3021(multiplied)X3382(by)X2 f3495(value)X1 f3669(,)X3722(and)X3872(then)X1114 5180(stored)N1330(in)X1412(the)X1530(corresponding)X2009(accumulation)X2461(buffer)X2678(cell,)X2834(overwriting)X3228(the)X3346(current)X3594(value.)X3 f554 5314(GL_ADD)N1 f1114(Adds)X2 f1303(value)X1 f1497(to)X1579(each)X1747(R,)X1840(G,)X1938(B,)X2031(and)X2167(A)X2245(in)X2327(the)X2445(accumulation)X2897(buffer.)X3 f554 5448(GL_MULT)N1 f1114(Multiplies)X1463(each)X1632(R,)X1726(G,)X1825(B,)X1919(and)X2056(A)X2135(in)X2218(the)X2337(accumulation)X2790(buffer)X3008(by)X2 f3110(value)X1 f3306(and)X3444(returns)X3689(the)X3809(scaled)X1114 5544(component)N1490(to)X1572(its)X1667(corresponding)X2146(accumulation)X2598(buffer)X2815(location.)X3 f554 5678(GL_RETURN)N1 f1114(Transfers)X1442(accumulation)X1898(buffer)X2120(values)X2350(to)X2437(the)X2560(color)X2750(buffer)X2972(or)X3064(buffers)X3317(currently)X3632(selected)X3916(for)X1114 5774(writing.)N1412(Each)X1600(R,)X1700(G,)X1805(B,)X1905(and)X2048(A)X2133(component)X2516(is)X2596(multiplied)X2951(by)X2 f3058(value)X1 f3232(,)X3279(then)X3444(multiplied)X3798(by)X3904($)X3970(2)X266 6144(Page)N442(1)X3577(July)X3730(22,)X3850(1997)X2 p%%Page: 2 210 s 0 xH 0 xS 1 f10 f0 96(h)N24(hhh)X4176(h)X4200(hhh)X9 s1 f266 480(G)N268(GL)X322(LA)X368(AC)X422(CC)X472(CU)X522(UM)X576(M)X646(\()X648(\()X684(\))X686(\))X1885(U)X1887(UN)X1941(NI)X1995(IX)X2021(X)X2093(S)X2095(Sy)X2137(ys)X2175(st)X2205(te)X2227(em)X2261(m)X2337(V)X2339(V)X3566(G)X3568(GL)X3622(LA)X3668(AC)X3722(CC)X3772(CU)X3822(UM)X3876(M)X3946(\()X3948(\()X3984(\))X3986(\))X10 s1114 864(sup)N1258(n\303-\3031$,)X1512(clamped)X1817(to)X1912(the)X2043(range)X2255([0,$)X2415(2)X2488(sup)X2632(n\303-\3031)X2826($],)X2946(and)X3095(stored)X3324(in)X3419(the)X3551(corresponding)X1114 960(display)N1366(buffer)X1584(cell.)X1761(The)X1907(only)X2069(fragment)X2379(operations)X2733(that)X2873(are)X2992(applied)X3248(to)X3330(this)X3465(transfer)X3731(are)X3850(pixel)X1114 1056(ownership,)N1488(scissor,)X1746(dithering,)X2075(and)X2211(color)X2396(writemasks.)X554 1190(To)N673(clear)X860(the)X988(accumulation)X1450(buffer,)X1697(call)X3 f1843(glClearAccum)X1 f2368(with)X2540(R,)X2643(G,)X2751(B,)X2854(and)X3000(A)X3088(values)X3324(to)X3417(set)X3537(it)X3612(to,)X3725(then)X3894(call)X3 f554 1286(glClear)N1 f828(with)X990(the)X1108(accumulation)X1560(buffer)X1777(enabled.)X9 s266 1420(N)N268(NO)X322(OT)X376(TE)X422(ES)X468(S)X10 s554 1516(Only)N734(pixels)X945(within)X1169(the)X1287(current)X1535(scissor)X1773(box)X1913(are)X2032(updated)X2306(by)X2406(a)X3 f2462(glAccum)X1 f2785(operation.)X9 s266 1650(E)N268(ER)X314(RR)X364(RO)X414(OR)X468(RS)X518(S)X3 f10 s554 1746(GL_INVALID_ENUM)N1 f1361(is)X1434(generated)X1767(if)X2 f1836(op)X1 f1936(is)X2009(not)X2131(an)X2227(accepted)X2529(value.)X3 f554 1880(GL_INVALID_OPERATION)N1 f1600(is)X1673(generated)X2006(if)X2075(there)X2256(is)X2329(no)X2429(accumulation)X2881(buffer.)X3 f554 2014(GL_INVALID_OPERATION)N1 f1601(is)X1675(generated)X2009(if)X3 f2079(glAccum)X1 f2403(is)X2477(executed)X2784(between)X3073(the)X3192(execution)X3526(of)X3 f3615(glBegin)X1 f3894(and)X554 2110(the)N672(corresponding)X1151(execution)X1483(of)X3 f1570(glEnd)X1 f1773(.)X9 s266 2244(A)N268(AS)X322(SS)X364(SO)X406(OC)X460(CI)X510(IA)X536(AT)X590(TE)X636(ED)X682(D)X766(G)X768(GE)X822(ET)X868(TS)X914(S)X3 f10 s554 2340(glGet)N1 f761(with)X923(argument)X3 f1246(GL_ACCUM_RED_BITS)X554 2436(glGet)N1 f761(with)X923(argument)X3 f1246(GL_ACCUM_GREEN_BITS)X554 2532(glGet)N1 f761(with)X923(argument)X3 f1246(GL_ACCUM_BLUE_BITS)X554 2628(glGet)N1 f761(with)X923(argument)X3 f1246(GL_ACCUM_ALPHA_BITS)X1 f9 s266 2762(S)N268(SE)X310(EE)X356(E)X432(A)X434(AL)X488(LS)X534(SO)X576(O)X3 f10 s554 2858(glBlendFunc)N1 f988(,)X3 f1033(glClear)X1 f1287(,)X3 f1332(glClearAccum)X1 f1827(,)X3 f1872(glCopyPixels)X1 f2316(,)X3 f2361(glGet)X1 f2548(,)X3 f2593(glLogicOp)X1 f2952(,)X3 f2997(glPixelStore)X1 f3411(,)X3 f3456(glPixelTransfer)X1 f3990(,)X3 f554 2954(glReadBuffer)N1 f1017(,)X3 f1057(glReadPixels)X1 f(,)S3 f1537(glScissor)X1 f1839(,)X3 f1879(glStencilOp)X1 f266 6144(July)N419(22,)X539(1997)X3794(Page)X3970(2)X10 f0 6428(h)N24(hhh)X4176(h)X4200(hhh)X2 p%%Trailerxtxs⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -