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| Rev | Author | Line No. | Line |
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| 135 | giacomo | 1 | /* $Id: s_aatempline.h,v 1.1 2003-04-24 14:24:01 giacomo Exp $ */ |
| 2 | |||
| 3 | /* |
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| 4 | * Mesa 3-D graphics library |
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| 5 | * Version: 4.1 |
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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 | * Antialiased line template. |
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| 30 | */ |
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| 31 | |||
| 32 | |||
| 33 | /* |
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| 34 | * Function to render each fragment in the AA line. |
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| 35 | */ |
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| 36 | static void |
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| 37 | NAME(plot)(GLcontext *ctx, struct LineInfo *line, int ix, int iy) |
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| 38 | { |
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| 39 | const GLfloat fx = (GLfloat) ix; |
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| 40 | const GLfloat fy = (GLfloat) iy; |
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| 41 | const GLfloat coverage = compute_coveragef(line, ix, iy); |
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| 42 | const GLuint i = line->span.end; |
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| 43 | |||
| 44 | if (coverage == 0.0) |
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| 45 | return; |
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| 46 | |||
| 47 | line->span.end++; |
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| 48 | line->span.array->coverage[i] = coverage; |
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| 49 | line->span.array->x[i] = ix; |
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| 50 | line->span.array->y[i] = iy; |
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| 51 | |||
| 52 | /* |
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| 53 | * Compute Z, color, texture coords, fog for the fragment by |
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| 54 | * solving the plane equations at (ix,iy). |
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| 55 | */ |
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| 56 | #ifdef DO_Z |
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| 57 | line->span.array->z[i] = (GLdepth) solve_plane(fx, fy, line->zPlane); |
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| 58 | #endif |
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| 59 | #ifdef DO_FOG |
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| 60 | line->span.array->fog[i] = solve_plane(fx, fy, line->fPlane); |
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| 61 | #endif |
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| 62 | #ifdef DO_RGBA |
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| 63 | line->span.array->rgba[i][RCOMP] = solve_plane_chan(fx, fy, line->rPlane); |
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| 64 | line->span.array->rgba[i][GCOMP] = solve_plane_chan(fx, fy, line->gPlane); |
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| 65 | line->span.array->rgba[i][BCOMP] = solve_plane_chan(fx, fy, line->bPlane); |
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| 66 | line->span.array->rgba[i][ACOMP] = solve_plane_chan(fx, fy, line->aPlane); |
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| 67 | #endif |
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| 68 | #ifdef DO_INDEX |
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| 69 | line->span.array->index[i] = (GLint) solve_plane(fx, fy, line->iPlane); |
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| 70 | #endif |
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| 71 | #ifdef DO_SPEC |
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| 72 | line->span.array->spec[i][RCOMP] = solve_plane_chan(fx, fy, line->srPlane); |
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| 73 | line->span.array->spec[i][GCOMP] = solve_plane_chan(fx, fy, line->sgPlane); |
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| 74 | line->span.array->spec[i][BCOMP] = solve_plane_chan(fx, fy, line->sbPlane); |
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| 75 | #endif |
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| 76 | #ifdef DO_TEX |
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| 77 | { |
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| 78 | const GLfloat invQ = solve_plane_recip(fx, fy, line->vPlane[0]); |
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| 79 | line->span.array->texcoords[0][i][0] = solve_plane(fx, fy, line->sPlane[0]) * invQ; |
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| 80 | line->span.array->texcoords[0][i][1] = solve_plane(fx, fy, line->tPlane[0]) * invQ; |
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| 81 | line->span.array->texcoords[0][i][2] = solve_plane(fx, fy, line->uPlane[0]) * invQ; |
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| 82 | line->span.array->lambda[0][i] = compute_lambda(line->sPlane[0], line->tPlane[0], invQ, |
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| 83 | line->texWidth[0], line->texHeight[0]); |
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| 84 | } |
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| 85 | #elif defined(DO_MULTITEX) |
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| 86 | { |
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| 87 | GLuint unit; |
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| 88 | for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) { |
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| 89 | if (ctx->Texture.Unit[unit]._ReallyEnabled) { |
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| 90 | const GLfloat invQ = solve_plane_recip(fx, fy, line->vPlane[unit]); |
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| 91 | line->span.array->texcoords[unit][i][0] = solve_plane(fx, fy, line->sPlane[unit]) * invQ; |
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| 92 | line->span.array->texcoords[unit][i][1] = solve_plane(fx, fy, line->tPlane[unit]) * invQ; |
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| 93 | line->span.array->texcoords[unit][i][2] = solve_plane(fx, fy, line->uPlane[unit]) * invQ; |
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| 94 | line->span.array->lambda[unit][i] = compute_lambda(line->sPlane[unit], |
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| 95 | line->tPlane[unit], invQ, |
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| 96 | line->texWidth[unit], line->texHeight[unit]); |
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| 97 | } |
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| 98 | } |
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| 99 | } |
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| 100 | #endif |
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| 101 | |||
| 102 | if (line->span.end == MAX_WIDTH) { |
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| 103 | #if defined(DO_TEX) || defined(DO_MULTITEX) |
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| 104 | _mesa_write_texture_span(ctx, &(line->span)); |
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| 105 | #elif defined(DO_RGBA) |
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| 106 | _mesa_write_rgba_span(ctx, &(line->span)); |
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| 107 | #else |
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| 108 | _mesa_write_index_span(ctx, &(line->span)); |
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| 109 | #endif |
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| 110 | line->span.end = 0; /* reset counter */ |
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| 111 | } |
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| 112 | } |
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| 113 | |||
| 114 | |||
| 115 | |||
| 116 | /* |
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| 117 | * Line setup |
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| 118 | */ |
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| 119 | static void |
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| 120 | NAME(line)(GLcontext *ctx, const SWvertex *v0, const SWvertex *v1) |
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| 121 | { |
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| 122 | SWcontext *swrast = SWRAST_CONTEXT(ctx); |
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| 123 | GLfloat tStart, tEnd; /* segment start, end along line length */ |
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| 124 | GLboolean inSegment; |
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| 125 | GLint iLen, i; |
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| 126 | |||
| 127 | /* Init the LineInfo struct */ |
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| 128 | struct LineInfo line; |
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| 129 | line.x0 = v0->win[0]; |
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| 130 | line.y0 = v0->win[1]; |
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| 131 | line.x1 = v1->win[0]; |
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| 132 | line.y1 = v1->win[1]; |
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| 133 | line.dx = line.x1 - line.x0; |
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| 134 | line.dy = line.y1 - line.y0; |
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| 135 | line.len = (GLfloat) sqrt(line.dx * line.dx + line.dy * line.dy); |
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| 136 | line.halfWidth = 0.5F * ctx->Line.Width; |
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| 137 | |||
| 138 | if (line.len == 0.0 || IS_INF_OR_NAN(line.len)) |
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| 139 | return; |
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| 140 | |||
| 141 | INIT_SPAN(line.span, GL_LINE, 0, 0, SPAN_XY | SPAN_COVERAGE); |
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| 142 | |||
| 143 | line.xAdj = line.dx / line.len * line.halfWidth; |
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| 144 | line.yAdj = line.dy / line.len * line.halfWidth; |
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| 145 | |||
| 146 | #ifdef DO_Z |
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| 147 | line.span.arrayMask |= SPAN_Z; |
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| 148 | compute_plane(line.x0, line.y0, line.x1, line.y1, |
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| 149 | v0->win[2], v1->win[2], line.zPlane); |
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| 150 | #endif |
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| 151 | #ifdef DO_FOG |
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| 152 | line.span.arrayMask |= SPAN_FOG; |
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| 153 | compute_plane(line.x0, line.y0, line.x1, line.y1, |
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| 154 | v0->fog, v1->fog, line.fPlane); |
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| 155 | #endif |
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| 156 | #ifdef DO_RGBA |
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| 157 | line.span.arrayMask |= SPAN_RGBA; |
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| 158 | if (ctx->Light.ShadeModel == GL_SMOOTH) { |
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| 159 | compute_plane(line.x0, line.y0, line.x1, line.y1, |
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| 160 | v0->color[RCOMP], v1->color[RCOMP], line.rPlane); |
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| 161 | compute_plane(line.x0, line.y0, line.x1, line.y1, |
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| 162 | v0->color[GCOMP], v1->color[GCOMP], line.gPlane); |
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| 163 | compute_plane(line.x0, line.y0, line.x1, line.y1, |
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| 164 | v0->color[BCOMP], v1->color[BCOMP], line.bPlane); |
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| 165 | compute_plane(line.x0, line.y0, line.x1, line.y1, |
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| 166 | v0->color[ACOMP], v1->color[ACOMP], line.aPlane); |
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| 167 | } |
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| 168 | else { |
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| 169 | constant_plane(v1->color[RCOMP], line.rPlane); |
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| 170 | constant_plane(v1->color[GCOMP], line.gPlane); |
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| 171 | constant_plane(v1->color[BCOMP], line.bPlane); |
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| 172 | constant_plane(v1->color[ACOMP], line.aPlane); |
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| 173 | } |
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| 174 | #endif |
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| 175 | #ifdef DO_SPEC |
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| 176 | line.span.arrayMask |= SPAN_SPEC; |
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| 177 | if (ctx->Light.ShadeModel == GL_SMOOTH) { |
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| 178 | compute_plane(line.x0, line.y0, line.x1, line.y1, |
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| 179 | v0->specular[RCOMP], v1->specular[RCOMP], line.srPlane); |
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| 180 | compute_plane(line.x0, line.y0, line.x1, line.y1, |
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| 181 | v0->specular[GCOMP], v1->specular[GCOMP], line.sgPlane); |
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| 182 | compute_plane(line.x0, line.y0, line.x1, line.y1, |
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| 183 | v0->specular[BCOMP], v1->specular[BCOMP], line.sbPlane); |
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| 184 | } |
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| 185 | else { |
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| 186 | constant_plane(v1->specular[RCOMP], line.srPlane); |
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| 187 | constant_plane(v1->specular[GCOMP], line.sgPlane); |
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| 188 | constant_plane(v1->specular[BCOMP], line.sbPlane); |
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| 189 | } |
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| 190 | #endif |
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| 191 | #ifdef DO_INDEX |
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| 192 | line.span.arrayMask |= SPAN_INDEX; |
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| 193 | if (ctx->Light.ShadeModel == GL_SMOOTH) { |
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| 194 | compute_plane(line.x0, line.y0, line.x1, line.y1, |
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| 195 | (GLfloat) v0->index, (GLfloat) v1->index, line.iPlane); |
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| 196 | } |
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| 197 | else { |
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| 198 | constant_plane((GLfloat) v1->index, line.iPlane); |
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| 199 | } |
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| 200 | #endif |
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| 201 | #ifdef DO_TEX |
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| 202 | { |
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| 203 | const struct gl_texture_object *obj = ctx->Texture.Unit[0]._Current; |
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| 204 | const struct gl_texture_image *texImage = obj->Image[obj->BaseLevel]; |
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| 205 | const GLfloat invW0 = v0->win[3]; |
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| 206 | const GLfloat invW1 = v1->win[3]; |
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| 207 | const GLfloat s0 = v0->texcoord[0][0] * invW0; |
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| 208 | const GLfloat s1 = v1->texcoord[0][0] * invW1; |
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| 209 | const GLfloat t0 = v0->texcoord[0][1] * invW0; |
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| 210 | const GLfloat t1 = v1->texcoord[0][1] * invW0; |
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| 211 | const GLfloat r0 = v0->texcoord[0][2] * invW0; |
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| 212 | const GLfloat r1 = v1->texcoord[0][2] * invW0; |
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| 213 | const GLfloat q0 = v0->texcoord[0][3] * invW0; |
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| 214 | const GLfloat q1 = v1->texcoord[0][3] * invW0; |
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| 215 | line.span.arrayMask |= (SPAN_TEXTURE | SPAN_LAMBDA); |
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| 216 | compute_plane(line.x0, line.y0, line.x1, line.y1, s0, s1, line.sPlane[0]); |
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| 217 | compute_plane(line.x0, line.y0, line.x1, line.y1, t0, t1, line.tPlane[0]); |
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| 218 | compute_plane(line.x0, line.y0, line.x1, line.y1, r0, r1, line.uPlane[0]); |
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| 219 | compute_plane(line.x0, line.y0, line.x1, line.y1, q0, q1, line.vPlane[0]); |
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| 220 | line.texWidth[0] = (GLfloat) texImage->Width; |
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| 221 | line.texHeight[0] = (GLfloat) texImage->Height; |
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| 222 | } |
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| 223 | #elif defined(DO_MULTITEX) |
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| 224 | { |
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| 225 | GLuint u; |
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| 226 | line.span.arrayMask |= (SPAN_TEXTURE | SPAN_LAMBDA); |
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| 227 | for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { |
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| 228 | if (ctx->Texture.Unit[u]._ReallyEnabled) { |
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| 229 | const struct gl_texture_object *obj = ctx->Texture.Unit[u]._Current; |
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| 230 | const struct gl_texture_image *texImage = obj->Image[obj->BaseLevel]; |
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| 231 | const GLfloat invW0 = v0->win[3]; |
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| 232 | const GLfloat invW1 = v1->win[3]; |
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| 233 | const GLfloat s0 = v0->texcoord[u][0] * invW0; |
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| 234 | const GLfloat s1 = v1->texcoord[u][0] * invW1; |
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| 235 | const GLfloat t0 = v0->texcoord[u][1] * invW0; |
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| 236 | const GLfloat t1 = v1->texcoord[u][1] * invW0; |
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| 237 | const GLfloat r0 = v0->texcoord[u][2] * invW0; |
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| 238 | const GLfloat r1 = v1->texcoord[u][2] * invW0; |
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| 239 | const GLfloat q0 = v0->texcoord[u][3] * invW0; |
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| 240 | const GLfloat q1 = v1->texcoord[u][3] * invW0; |
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| 241 | compute_plane(line.x0, line.y0, line.x1, line.y1, s0, s1, line.sPlane[u]); |
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| 242 | compute_plane(line.x0, line.y0, line.x1, line.y1, t0, t1, line.tPlane[u]); |
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| 243 | compute_plane(line.x0, line.y0, line.x1, line.y1, r0, r1, line.uPlane[u]); |
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| 244 | compute_plane(line.x0, line.y0, line.x1, line.y1, q0, q1, line.vPlane[u]); |
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| 245 | line.texWidth[u] = (GLfloat) texImage->Width; |
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| 246 | line.texHeight[u] = (GLfloat) texImage->Height; |
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| 247 | } |
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| 248 | } |
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| 249 | } |
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| 250 | #endif |
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| 251 | |||
| 252 | tStart = tEnd = 0.0; |
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| 253 | inSegment = GL_FALSE; |
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| 254 | iLen = (GLint) line.len; |
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| 255 | |||
| 256 | if (ctx->Line.StippleFlag) { |
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| 257 | for (i = 0; i < iLen; i++) { |
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| 258 | const GLuint bit = (swrast->StippleCounter / ctx->Line.StippleFactor) & 0xf; |
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| 259 | if ((1 << bit) & ctx->Line.StipplePattern) { |
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| 260 | /* stipple bit is on */ |
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| 261 | const GLfloat t = (GLfloat) i / (GLfloat) line.len; |
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| 262 | if (!inSegment) { |
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| 263 | /* start new segment */ |
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| 264 | inSegment = GL_TRUE; |
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| 265 | tStart = t; |
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| 266 | } |
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| 267 | else { |
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| 268 | /* still in the segment, extend it */ |
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| 269 | tEnd = t; |
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| 270 | } |
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| 271 | } |
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| 272 | else { |
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| 273 | /* stipple bit is off */ |
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| 274 | if (inSegment && (tEnd > tStart)) { |
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| 275 | /* draw the segment */ |
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| 276 | segment(ctx, &line, NAME(plot), tStart, tEnd); |
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| 277 | inSegment = GL_FALSE; |
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| 278 | } |
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| 279 | else { |
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| 280 | /* still between segments, do nothing */ |
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| 281 | } |
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| 282 | } |
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| 283 | swrast->StippleCounter++; |
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| 284 | } |
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| 285 | |||
| 286 | if (inSegment) { |
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| 287 | /* draw the final segment of the line */ |
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| 288 | segment(ctx, &line, NAME(plot), tStart, 1.0F); |
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| 289 | } |
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| 290 | } |
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| 291 | else { |
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| 292 | /* non-stippled */ |
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| 293 | segment(ctx, &line, NAME(plot), 0.0, 1.0); |
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| 294 | } |
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| 295 | |||
| 296 | #if defined(DO_TEX) || defined(DO_MULTITEX) |
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| 297 | _mesa_write_texture_span(ctx, &(line.span)); |
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| 298 | #elif defined(DO_RGBA) |
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| 299 | _mesa_write_rgba_span(ctx, &(line.span)); |
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| 300 | #else |
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| 301 | _mesa_write_index_span(ctx, &(line.span)); |
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| 302 | #endif |
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| 303 | } |
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| 304 | |||
| 305 | |||
| 306 | |||
| 307 | |||
| 308 | #undef DO_Z |
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| 309 | #undef DO_FOG |
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| 310 | #undef DO_RGBA |
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| 311 | #undef DO_INDEX |
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| 312 | #undef DO_SPEC |
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| 313 | #undef DO_TEX |
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| 314 | #undef DO_MULTITEX |
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| 315 | #undef NAME |