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| Rev | Author | Line No. | Line |
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| 57 | pj | 1 | /* $Id: s_pointtemp.h,v 1.1 2003-02-28 11:49:42 pj Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 5.0 |
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| 6 | * |
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| 7 | * Copyright (C) 1999-2002 Brian Paul All Rights Reserved. |
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| 8 | * |
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| 9 | * Permission is hereby granted, free of charge, to any person obtaining a |
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| 10 | * copy of this software and associated documentation files (the "Software"), |
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| 11 | * to deal in the Software without restriction, including without limitation |
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| 12 | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
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| 13 | * and/or sell copies of the Software, and to permit persons to whom the |
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| 14 | * Software is furnished to do so, subject to the following conditions: |
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| 15 | * |
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| 16 | * The above copyright notice and this permission notice shall be included |
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| 17 | * in all copies or substantial portions of the Software. |
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| 18 | * |
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| 19 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS |
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| 20 | * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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| 21 | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
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| 22 | * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN |
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| 23 | * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN |
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| 24 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. |
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| 25 | */ |
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| 26 | |||
| 27 | |||
| 28 | /* |
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| 29 | * Point rendering template code. |
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| 30 | * |
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| 31 | * Set FLAGS = bitwise-OR of the following tokens: |
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| 32 | * |
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| 33 | * RGBA = do rgba instead of color index |
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| 34 | * SMOOTH = do antialiasing |
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| 35 | * TEXTURE = do texture coords |
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| 36 | * SPECULAR = do separate specular color |
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| 37 | * LARGE = do points with diameter > 1 pixel |
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| 38 | * ATTENUATE = compute point size attenuation |
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| 39 | * SPRITE = GL_NV_point_sprite |
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| 40 | * |
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| 41 | * Notes: LARGE and ATTENUATE are exclusive of each other. |
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| 42 | * TEXTURE requires RGBA |
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| 43 | * SPECULAR requires TEXTURE |
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| 44 | */ |
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| 45 | |||
| 46 | |||
| 47 | /* |
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| 48 | * NOTES on antialiased point rasterization: |
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| 49 | * |
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| 50 | * Let d = distance of fragment center from vertex. |
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| 51 | * if d < rmin2 then |
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| 52 | * fragment has 100% coverage |
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| 53 | * else if d > rmax2 then |
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| 54 | * fragment has 0% coverage |
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| 55 | * else |
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| 56 | * fragment has % coverage = (d - rmin2) / (rmax2 - rmin2) |
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| 57 | */ |
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| 58 | |||
| 59 | |||
| 60 | |||
| 61 | static void |
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| 62 | NAME ( GLcontext *ctx, const SWvertex *vert ) |
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| 63 | { |
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| 64 | #if FLAGS & (ATTENUATE | LARGE | SMOOTH | SPRITE) |
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| 65 | GLfloat size; |
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| 66 | #endif |
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| 67 | #if FLAGS & ATTENUATE |
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| 68 | GLfloat alphaAtten; |
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| 69 | #endif |
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| 70 | #if FLAGS & RGBA |
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| 71 | const GLchan red = vert->color[0]; |
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| 72 | const GLchan green = vert->color[1]; |
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| 73 | const GLchan blue = vert->color[2]; |
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| 74 | const GLchan alpha = vert->color[3]; |
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| 75 | #endif |
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| 76 | #if FLAGS & SPECULAR |
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| 77 | const GLchan specRed = vert->specular[0]; |
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| 78 | const GLchan specGreen = vert->specular[1]; |
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| 79 | const GLchan specBlue = vert->specular[2]; |
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| 80 | #endif |
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| 81 | #if FLAGS & INDEX |
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| 82 | const GLuint colorIndex = vert->index; |
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| 83 | #endif |
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| 84 | #if FLAGS & TEXTURE |
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| 85 | GLfloat texcoord[MAX_TEXTURE_UNITS][4]; |
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| 86 | GLuint u; |
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| 87 | #endif |
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| 88 | SWcontext *swrast = SWRAST_CONTEXT(ctx); |
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| 89 | struct sw_span *span = &(swrast->PointSpan); |
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| 90 | |||
| 91 | /* Cull primitives with malformed coordinates. |
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| 92 | */ |
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| 93 | { |
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| 94 | float tmp = vert->win[0] + vert->win[1]; |
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| 95 | if (IS_INF_OR_NAN(tmp)) |
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| 96 | return; |
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| 97 | } |
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| 98 | |||
| 99 | /* |
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| 100 | * Span init |
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| 101 | */ |
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| 102 | span->interpMask = SPAN_FOG; |
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| 103 | span->arrayMask = SPAN_XY | SPAN_Z; |
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| 104 | span->fog = vert->fog; |
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| 105 | span->fogStep = 0.0; |
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| 106 | #if FLAGS & RGBA |
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| 107 | span->arrayMask |= SPAN_RGBA; |
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| 108 | #endif |
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| 109 | #if FLAGS & SPECULAR |
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| 110 | span->arrayMask |= SPAN_SPEC; |
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| 111 | #endif |
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| 112 | #if FLAGS & INDEX |
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| 113 | span->arrayMask |= SPAN_INDEX; |
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| 114 | #endif |
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| 115 | #if FLAGS & TEXTURE |
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| 116 | span->arrayMask |= SPAN_TEXTURE; |
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| 117 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 118 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 119 | const GLfloat q = vert->texcoord[u][3]; |
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| 120 | const GLfloat invQ = (q == 0.0F || q == 1.0F) ? 1.0F : (1.0F / q); |
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| 121 | texcoord[u][0] = vert->texcoord[u][0] * invQ; |
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| 122 | texcoord[u][1] = vert->texcoord[u][1] * invQ; |
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| 123 | texcoord[u][2] = vert->texcoord[u][2] * invQ; |
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| 124 | texcoord[u][3] = q; |
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| 125 | } |
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| 126 | } |
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| 127 | #endif |
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| 128 | #if FLAGS & SMOOTH |
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| 129 | span->arrayMask |= SPAN_COVERAGE; |
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| 130 | #endif |
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| 131 | #if FLAGS & SPRITE |
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| 132 | span->arrayMask |= SPAN_TEXTURE; |
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| 133 | #endif |
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| 134 | |||
| 135 | #if FLAGS & ATTENUATE |
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| 136 | if (vert->pointSize >= ctx->Point.Threshold) { |
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| 137 | size = MIN2(vert->pointSize, ctx->Point.MaxSize); |
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| 138 | alphaAtten = 1.0F; |
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| 139 | } |
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| 140 | else { |
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| 141 | GLfloat dsize = vert->pointSize / ctx->Point.Threshold; |
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| 142 | size = MAX2(ctx->Point.Threshold, ctx->Point.MinSize); |
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| 143 | alphaAtten = dsize * dsize; |
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| 144 | } |
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| 145 | #elif FLAGS & (LARGE | SMOOTH | SPRITE) |
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| 146 | size = ctx->Point._Size; |
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| 147 | #endif |
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| 148 | |||
| 149 | #if FLAGS & (ATTENUATE | LARGE | SMOOTH | SPRITE) |
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| 150 | /* |
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| 151 | * Multi-pixel points |
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| 152 | */ |
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| 153 | {{ |
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| 154 | GLint x, y; |
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| 155 | const GLfloat radius = 0.5F * size; |
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| 156 | const GLint z = (GLint) (vert->win[2] + 0.5F); |
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| 157 | GLuint count; |
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| 158 | #if FLAGS & SMOOTH |
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| 159 | const GLfloat rmin = radius - 0.7071F; /* 0.7071 = sqrt(2)/2 */ |
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| 160 | const GLfloat rmax = radius + 0.7071F; |
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| 161 | const GLfloat rmin2 = MAX2(0.0F, rmin * rmin); |
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| 162 | const GLfloat rmax2 = rmax * rmax; |
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| 163 | const GLfloat cscale = 1.0F / (rmax2 - rmin2); |
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| 164 | const GLint xmin = (GLint) (vert->win[0] - radius); |
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| 165 | const GLint xmax = (GLint) (vert->win[0] + radius); |
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| 166 | const GLint ymin = (GLint) (vert->win[1] - radius); |
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| 167 | const GLint ymax = (GLint) (vert->win[1] + radius); |
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| 168 | #else |
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| 169 | /* non-smooth */ |
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| 170 | GLint xmin, xmax, ymin, ymax; |
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| 171 | GLint iSize = (GLint) (size + 0.5F); |
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| 172 | GLint iRadius; |
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| 173 | iSize = MAX2(1, iSize); |
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| 174 | iRadius = iSize / 2; |
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| 175 | if (iSize & 1) { |
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| 176 | /* odd size */ |
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| 177 | xmin = (GLint) (vert->win[0] - iRadius); |
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| 178 | xmax = (GLint) (vert->win[0] + iRadius); |
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| 179 | ymin = (GLint) (vert->win[1] - iRadius); |
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| 180 | ymax = (GLint) (vert->win[1] + iRadius); |
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| 181 | } |
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| 182 | else { |
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| 183 | /* even size */ |
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| 184 | xmin = (GLint) vert->win[0] - iRadius + 1; |
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| 185 | xmax = xmin + iSize - 1; |
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| 186 | ymin = (GLint) vert->win[1] - iRadius + 1; |
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| 187 | ymax = ymin + iSize - 1; |
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| 188 | } |
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| 189 | #endif /*SMOOTH*/ |
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| 190 | |||
| 191 | /* check if we need to flush */ |
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| 192 | if (span->end + (xmax-xmin+1) * (ymax-ymin+1) >= MAX_WIDTH || |
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| 193 | (swrast->_RasterMask & (BLEND_BIT | LOGIC_OP_BIT | MASKING_BIT))) { |
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| 194 | #if FLAGS & (TEXTURE | SPRITE) |
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| 195 | if (ctx->Texture._EnabledUnits) |
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| 196 | _mesa_write_texture_span(ctx, span); |
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| 197 | else |
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| 198 | _mesa_write_rgba_span(ctx, span); |
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| 199 | #elif FLAGS & RGBA |
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| 200 | _mesa_write_rgba_span(ctx, span); |
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| 201 | #else |
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| 202 | _mesa_write_index_span(ctx, span); |
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| 203 | #endif |
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| 204 | span->end = 0; |
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| 205 | } |
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| 206 | |||
| 207 | /* |
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| 208 | * OK, generate fragments |
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| 209 | */ |
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| 210 | count = span->end; |
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| 211 | (void) radius; |
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| 212 | for (y = ymin; y <= ymax; y++) { |
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| 213 | for (x = xmin; x <= xmax; x++) { |
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| 214 | #if FLAGS & (SPRITE | TEXTURE) |
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| 215 | GLuint u; |
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| 216 | #endif |
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| 217 | |||
| 218 | #if FLAGS & RGBA |
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| 219 | span->array->rgba[count][RCOMP] = red; |
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| 220 | span->array->rgba[count][GCOMP] = green; |
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| 221 | span->array->rgba[count][BCOMP] = blue; |
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| 222 | span->array->rgba[count][ACOMP] = alpha; |
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| 223 | #endif |
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| 224 | #if FLAGS & SPECULAR |
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| 225 | span->array->spec[count][RCOMP] = specRed; |
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| 226 | span->array->spec[count][GCOMP] = specGreen; |
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| 227 | span->array->spec[count][BCOMP] = specBlue; |
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| 228 | #endif |
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| 229 | #if FLAGS & INDEX |
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| 230 | span->array->index[count] = colorIndex; |
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| 231 | #endif |
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| 232 | #if FLAGS & TEXTURE |
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| 233 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 234 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 235 | COPY_4V(span->array->texcoords[u][count], texcoord[u]); |
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| 236 | } |
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| 237 | } |
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| 238 | #endif |
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| 239 | |||
| 240 | #if FLAGS & SMOOTH |
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| 241 | /* compute coverage */ |
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| 242 | { |
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| 243 | const GLfloat dx = x - vert->win[0] + 0.5F; |
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| 244 | const GLfloat dy = y - vert->win[1] + 0.5F; |
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| 245 | const GLfloat dist2 = dx * dx + dy * dy; |
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| 246 | if (dist2 < rmax2) { |
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| 247 | if (dist2 >= rmin2) { |
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| 248 | /* compute partial coverage */ |
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| 249 | span->array->coverage[count] = 1.0F - (dist2 - rmin2) * cscale; |
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| 250 | #if FLAGS & INDEX |
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| 251 | /* coverage in [0,15] */ |
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| 252 | span->array->coverage[count] *= 15.0; |
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| 253 | #endif |
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| 254 | } |
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| 255 | else { |
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| 256 | /* full coverage */ |
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| 257 | span->array->coverage[count] = 1.0F; |
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| 258 | } |
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| 259 | |||
| 260 | span->array->x[count] = x; |
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| 261 | span->array->y[count] = y; |
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| 262 | span->array->z[count] = z; |
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| 263 | |||
| 264 | #if (FLAGS & ATTENUATE) && (FLAGS & RGBA) |
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| 265 | span->array->rgba[count][ACOMP] = (GLchan) (alpha * alphaAtten); |
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| 266 | #elif FLAGS & RGBA |
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| 267 | span->array->rgba[count][ACOMP] = alpha; |
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| 268 | #endif /*ATTENUATE*/ |
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| 269 | count++; |
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| 270 | } /*if*/ |
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| 271 | } |
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| 272 | |||
| 273 | #else /*SMOOTH*/ |
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| 274 | |||
| 275 | /* not smooth (square points) */ |
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| 276 | span->array->x[count] = x; |
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| 277 | span->array->y[count] = y; |
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| 278 | span->array->z[count] = z; |
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| 279 | |||
| 280 | #if FLAGS & SPRITE |
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| 281 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 282 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 283 | if (ctx->Point.CoordReplace[u]) { |
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| 284 | GLfloat s = 0.5F + (x + 0.5F - vert->win[0]) / size; |
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| 285 | GLfloat t = 0.5F - (y + 0.5F - vert->win[1]) / size; |
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| 286 | span->array->texcoords[u][count][0] = s; |
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| 287 | span->array->texcoords[u][count][1] = t; |
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| 288 | span->array->texcoords[u][count][3] = 1.0F; |
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| 289 | if (ctx->Point.SpriteRMode == GL_ZERO) |
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| 290 | span->array->texcoords[u][count][2] = 0.0F; |
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| 291 | else if (ctx->Point.SpriteRMode == GL_S) |
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| 292 | span->array->texcoords[u][count][2] = vert->texcoord[u][0]; |
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| 293 | else /* GL_R */ |
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| 294 | span->array->texcoords[u][count][2] = vert->texcoord[u][2]; |
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| 295 | } |
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| 296 | else { |
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| 297 | COPY_4V(span->array->texcoords[u][count], vert->texcoord[u]); |
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| 298 | } |
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| 299 | } |
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| 300 | } |
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| 301 | #endif /*SPRITE*/ |
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| 302 | |||
| 303 | count++; /* square point */ |
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| 304 | |||
| 305 | #endif /*SMOOTH*/ |
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| 306 | |||
| 307 | } /*for x*/ |
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| 308 | } /*for y*/ |
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| 309 | span->end = count; |
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| 310 | }} |
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| 311 | |||
| 312 | #else /* LARGE | ATTENUATE | SMOOTH | SPRITE */ |
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| 313 | |||
| 314 | /* |
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| 315 | * Single-pixel points |
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| 316 | */ |
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| 317 | {{ |
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| 318 | GLuint count; |
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| 319 | |||
| 320 | /* check if we need to flush */ |
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| 321 | if (span->end >= MAX_WIDTH || |
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| 322 | (swrast->_RasterMask & (BLEND_BIT | LOGIC_OP_BIT | MASKING_BIT))) { |
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| 323 | #if FLAGS & (TEXTURE | SPRITE) |
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| 324 | if (ctx->Texture._EnabledUnits) |
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| 325 | _mesa_write_texture_span(ctx, span); |
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| 326 | else |
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| 327 | _mesa_write_rgba_span(ctx, span); |
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| 328 | #elif FLAGS & RGBA |
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| 329 | _mesa_write_rgba_span(ctx, span); |
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| 330 | #else |
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| 331 | _mesa_write_index_span(ctx, span); |
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| 332 | #endif |
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| 333 | span->end = 0; |
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| 334 | } |
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| 335 | |||
| 336 | count = span->end; |
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| 337 | |||
| 338 | #if FLAGS & RGBA |
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| 339 | span->array->rgba[count][RCOMP] = red; |
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| 340 | span->array->rgba[count][GCOMP] = green; |
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| 341 | span->array->rgba[count][BCOMP] = blue; |
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| 342 | span->array->rgba[count][ACOMP] = alpha; |
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| 343 | #endif |
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| 344 | #if FLAGS & SPECULAR |
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| 345 | span->array->spec[count][RCOMP] = specRed; |
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| 346 | span->array->spec[count][GCOMP] = specGreen; |
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| 347 | span->array->spec[count][BCOMP] = specBlue; |
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| 348 | #endif |
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| 349 | #if FLAGS & INDEX |
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| 350 | span->array->index[count] = colorIndex; |
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| 351 | #endif |
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| 352 | #if FLAGS & TEXTURE |
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| 353 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 354 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 355 | COPY_4V(span->array->texcoords[u][count], texcoord[u]); |
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| 356 | } |
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| 357 | } |
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| 358 | #endif |
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| 359 | |||
| 360 | span->array->x[count] = (GLint) vert->win[0]; |
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| 361 | span->array->y[count] = (GLint) vert->win[1]; |
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| 362 | span->array->z[count] = (GLint) (vert->win[2] + 0.5F); |
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| 363 | span->end = count + 1; |
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| 364 | }} |
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| 365 | |||
| 366 | #endif /* LARGE || ATTENUATE || SMOOTH */ |
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| 367 | |||
| 368 | ASSERT(span->end <= MAX_WIDTH); |
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| 369 | } |
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| 370 | |||
| 371 | |||
| 372 | #undef FLAGS |
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| 373 | #undef NAME |