diff options
| -rw-r--r-- | src/mesa/swrast/s_aaline.c | 509 | ||||
| -rw-r--r-- | src/mesa/swrast/s_aaline.h | 40 | ||||
| -rw-r--r-- | src/mesa/swrast/s_aalinetemp.h | 322 |
3 files changed, 871 insertions, 0 deletions
diff --git a/src/mesa/swrast/s_aaline.c b/src/mesa/swrast/s_aaline.c new file mode 100644 index 00000000000..377e6072c72 --- /dev/null +++ b/src/mesa/swrast/s_aaline.c @@ -0,0 +1,509 @@ +/* $Id: s_aaline.c,v 1.1 2000/11/05 23:15:16 brianp Exp $ */ + +/* + * Mesa 3-D graphics library + * Version: 3.5 + * + * Copyright (C) 1999-2000 Brian Paul All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + + +#include "glheader.h" +#include "swrast/s_aaline.h" +#include "swrast/s_pb.h" +#include "swrast/s_context.h" +#include "swrast/swrast.h" +#include "types.h" + + + +#define SUB_PIXEL 4 + + +/* + * Info about the AA line we're rendering + */ +struct LineInfo +{ + GLfloat x0, y0; /* start */ + GLfloat x1, y1; /* end */ + GLfloat dx, dy; /* direction vector */ + GLfloat len; /* length */ + GLfloat halfWidth; /* half of line width */ + GLfloat xAdj, yAdj; /* X and Y adjustment for quad corners around line */ + /* for coverage computation */ + GLfloat qx0, qy0; /* quad vertices */ + GLfloat qx1, qy1; + GLfloat qx2, qy2; + GLfloat qx3, qy3; + GLfloat ex0, ey0; /* quad edge vectors */ + GLfloat ex1, ey1; + GLfloat ex2, ey2; + GLfloat ex3, ey3; + + /* DO_Z */ + GLfloat zPlane[4]; + /* DO_FOG */ + GLfloat fPlane[4]; + /* DO_RGBA */ + GLfloat rPlane[4], gPlane[4], bPlane[4], aPlane[4]; + /* DO_INDEX */ + GLfloat iPlane[4]; + /* DO_SPEC */ + GLfloat srPlane[4], sgPlane[4], sbPlane[4]; + /* DO_TEX or DO_MULTITEX */ + GLfloat sPlane[MAX_TEXTURE_UNITS][4]; + GLfloat tPlane[MAX_TEXTURE_UNITS][4]; + GLfloat uPlane[MAX_TEXTURE_UNITS][4]; + GLfloat vPlane[MAX_TEXTURE_UNITS][4]; + GLfloat lambda[MAX_TEXTURE_UNITS]; + GLfloat texWidth[MAX_TEXTURE_UNITS], texHeight[MAX_TEXTURE_UNITS]; +}; + + + +/* + * Compute the equation of a plane used to interpolate line fragment data + * such as color, Z, texture coords, etc. + * Input: (x0, y0) and (x1,y1) are the endpoints of the line. + * z0, and z1 are the end point values to interpolate. + * Output: plane - the plane equation. + * + * Note: we don't really have enough parameters to specify a plane. + * We take the endpoints of the line and compute a plane such that + * the cross product of the line vector and the plane normal is + * parallel to the projection plane. + */ +static void +compute_plane(GLfloat x0, GLfloat y0, GLfloat x1, GLfloat y1, + GLfloat z0, GLfloat z1, GLfloat plane[4]) +{ +#if 0 + /* original */ + const GLfloat px = x1 - x0; + const GLfloat py = y1 - y0; + const GLfloat pz = z1 - z0; + const GLfloat qx = -py; + const GLfloat qy = px; + const GLfloat qz = 0; + const GLfloat a = py * qz - pz * qy; + const GLfloat b = pz * qx - px * qz; + const GLfloat c = px * qy - py * qx; + const GLfloat d = -(a * x0 + b * y0 + c * z0); + plane[0] = a; + plane[1] = b; + plane[2] = c; + plane[3] = d; +#else + /* simplified */ + const GLfloat px = x1 - x0; + const GLfloat py = y1 - y0; + const GLfloat pz = z0 - z1; + const GLfloat a = pz * px; + const GLfloat b = pz * py; + const GLfloat c = px * px + py * py; + const GLfloat d = -(a * x0 + b * y0 + c * z0); + plane[0] = a; + plane[1] = b; + plane[2] = c; + plane[3] = d; +#endif +} + + +static INLINE void +constant_plane(GLfloat value, GLfloat plane[4]) +{ + plane[0] = 0.0; + plane[1] = 0.0; + plane[2] = -1.0; + plane[3] = value; +} + + +static INLINE GLfloat +solve_plane(GLfloat x, GLfloat y, const GLfloat plane[4]) +{ + GLfloat z = (plane[3] + plane[0] * x + plane[1] * y) / -plane[2]; + return z; +} + +#define SOLVE_PLANE(X, Y, PLANE) \ + ((PLANE[3] + PLANE[0] * (X) + PLANE[1] * (Y)) / -PLANE[2]) + + +/* + * Return 1 / solve_plane(). + */ +static INLINE GLfloat +solve_plane_recip(GLfloat x, GLfloat y, const GLfloat plane[4]) +{ + GLfloat z = -plane[2] / (plane[3] + plane[0] * x + plane[1] * y); + return z; +} + + +/* + * Solve plane and return clamped GLchan value. + */ +static INLINE GLchan +solve_plane_chan(GLfloat x, GLfloat y, const GLfloat plane[4]) +{ + GLfloat z = (plane[3] + plane[0] * x + plane[1] * y) / -plane[2] + 0.5F; + if (z < 0.0F) + return 0; + else if (z > CHAN_MAXF) + return CHAN_MAXF; + return (GLchan) (GLint) z; +} + + +/* + * Compute mipmap level of detail. + */ +static INLINE GLfloat +compute_lambda(const GLfloat sPlane[4], const GLfloat tPlane[4], + GLfloat invQ, GLfloat width, GLfloat height) +{ + GLfloat dudx = sPlane[0] / sPlane[2] * invQ * width; + GLfloat dudy = sPlane[1] / sPlane[2] * invQ * width; + GLfloat dvdx = tPlane[0] / tPlane[2] * invQ * height; + GLfloat dvdy = tPlane[1] / tPlane[2] * invQ * height; + GLfloat r1 = dudx * dudx + dudy * dudy; + GLfloat r2 = dvdx * dvdx + dvdy * dvdy; + GLfloat rho2 = r1 + r2; + /* return log base 2 of rho */ + return log(rho2) * 1.442695 * 0.5; /* 1.442695 = 1/log(2) */ +} + + + + +/* + * Fill in the samples[] array with the (x,y) subpixel positions of + * xSamples * ySamples sample positions. + * Note that the four corner samples are put into the first four + * positions of the array. This allows us to optimize for the common + * case of all samples being inside the polygon. + */ +static void +make_sample_table(GLint xSamples, GLint ySamples, GLfloat samples[][2]) +{ + const GLfloat dx = 1.0F / (GLfloat) xSamples; + const GLfloat dy = 1.0F / (GLfloat) ySamples; + GLint x, y; + GLint i; + + i = 4; + for (x = 0; x < xSamples; x++) { + for (y = 0; y < ySamples; y++) { + GLint j; + if (x == 0 && y == 0) { + /* lower left */ + j = 0; + } + else if (x == xSamples - 1 && y == 0) { + /* lower right */ + j = 1; + } + else if (x == 0 && y == ySamples - 1) { + /* upper left */ + j = 2; + } + else if (x == xSamples - 1 && y == ySamples - 1) { + /* upper right */ + j = 3; + } + else { + j = i++; + } + samples[j][0] = x * dx; + samples[j][1] = y * dy; + } + } +} + + + +/* + * Compute how much of the given pixel's area is inside the rectangle + * defined by vertices v0, v1, v2, v3. + * Vertices MUST be specified in counter-clockwise order. + * Return: coverage in [0, 1]. + */ +static GLfloat +compute_coveragef(const struct LineInfo *info, + GLint winx, GLint winy) +{ + static GLfloat samples[SUB_PIXEL * SUB_PIXEL][2]; + static GLboolean haveSamples = GL_FALSE; + const GLfloat x = (GLfloat) winx; + const GLfloat y = (GLfloat) winy; + GLint stop = 4, i; + GLfloat insideCount = SUB_PIXEL * SUB_PIXEL; + + if (!haveSamples) { + make_sample_table(SUB_PIXEL, SUB_PIXEL, samples); + haveSamples = GL_TRUE; + } + +#if 0 /*DEBUG*/ + { + const GLfloat area = dx0 * dy1 - dx1 * dy0; + assert(area >= 0.0); + } +#endif + + for (i = 0; i < stop; i++) { + const GLfloat sx = x + samples[i][0]; + const GLfloat sy = y + samples[i][1]; + const GLfloat fx0 = sx - info->qx0; + const GLfloat fy0 = sy - info->qy0; + const GLfloat fx1 = sx - info->qx1; + const GLfloat fy1 = sy - info->qy1; + const GLfloat fx2 = sx - info->qx2; + const GLfloat fy2 = sy - info->qy2; + const GLfloat fx3 = sx - info->qx3; + const GLfloat fy3 = sy - info->qy3; + /* cross product determines if sample is inside or outside each edge */ + GLfloat cross0 = (info->ex0 * fy0 - info->ey0 * fx0); + GLfloat cross1 = (info->ex1 * fy1 - info->ey1 * fx1); + GLfloat cross2 = (info->ex2 * fy2 - info->ey2 * fx2); + GLfloat cross3 = (info->ex3 * fy3 - info->ey3 * fx3); + /* Check if the sample is exactly on an edge. If so, let cross be a + * positive or negative value depending on the direction of the edge. + */ + if (cross0 == 0.0F) + cross0 = info->ex0 + info->ey0; + if (cross1 == 0.0F) + cross1 = info->ex1 + info->ey1; + if (cross2 == 0.0F) + cross2 = info->ex2 + info->ey2; + if (cross3 == 0.0F) + cross3 = info->ex3 + info->ey3; + if (cross0 < 0.0F || cross1 < 0.0F || cross2 < 0.0F || cross3 < 0.0F) { + /* point is outside quadrilateral */ + insideCount -= 1.0F; + stop = SUB_PIXEL * SUB_PIXEL; + } + } + if (stop == 4) + return 1.0F; + else + return insideCount * (1.0F / (SUB_PIXEL * SUB_PIXEL)); +} + + + +typedef void (*plot_func)(GLcontext *ctx, const struct LineInfo *line, + struct pixel_buffer *pb, int ix, int iy); + + +/* + * Draw an AA line segment (called many times per line when stippling) + */ +static void +segment(GLcontext *ctx, + struct LineInfo *line, + plot_func plot, + struct pixel_buffer *pb, + GLfloat t0, GLfloat t1) +{ + const GLfloat absDx = (line->dx < 0.0F) ? -line->dx : line->dx; + const GLfloat absDy = (line->dy < 0.0F) ? -line->dy : line->dy; + /* compute the actual segment's endpoints */ + const GLfloat x0 = line->x0 + t0 * line->dx; + const GLfloat y0 = line->y0 + t0 * line->dy; + const GLfloat x1 = line->x0 + t1 * line->dx; + const GLfloat y1 = line->y0 + t1 * line->dy; + + /* compute vertices of the line-aligned quadrilateral */ + line->qx0 = x0 - line->yAdj; + line->qy0 = y0 + line->xAdj; + line->qx1 = x0 + line->yAdj; + line->qy1 = y0 - line->xAdj; + line->qx2 = x1 + line->yAdj; + line->qy2 = y1 - line->xAdj; + line->qx3 = x1 - line->yAdj; + line->qy3 = y1 + line->xAdj; + /* compute the quad's edge vectors (for coverage calc) */ + line->ex0 = line->qx1 - line->qx0; + line->ey0 = line->qy1 - line->qy0; + line->ex1 = line->qx2 - line->qx1; + line->ey1 = line->qy2 - line->qy1; + line->ex2 = line->qx3 - line->qx2; + line->ey2 = line->qy3 - line->qy2; + line->ex3 = line->qx0 - line->qx3; + line->ey3 = line->qy0 - line->qy3; + + if (absDx > absDy) { + /* X-major line */ + GLfloat dydx = line->dy / line->dx; + GLfloat xLeft, xRight, yBot, yTop; + GLint ix, ixRight; + if (x0 < x1) { + xLeft = x0 - line->halfWidth; + xRight = x1 + line->halfWidth; + if (line->dy >= 0.0) { + yBot = y0 - 3.0 * line->halfWidth; + yTop = y0 + line->halfWidth; + } + else { + yBot = y0 - line->halfWidth; + yTop = y0 + 3.0 * line->halfWidth; + } + } + else { + xLeft = x1 - line->halfWidth; + xRight = x0 + line->halfWidth; + if (line->dy <= 0.0) { + yBot = y1 - 3.0 * line->halfWidth; + yTop = y1 + line->halfWidth; + } + else { + yBot = y1 - line->halfWidth; + yTop = y1 + 3.0 * line->halfWidth; + } + } + + /* scan along the line, left-to-right */ + ixRight = (GLint) (xRight + 1.0F); + + /*printf("avg span height: %g\n", yTop - yBot);*/ + for (ix = (GLint) xLeft; ix < ixRight; ix++) { + const GLint iyBot = (GLint) yBot; + const GLint iyTop = (GLint) (yTop + 1.0F); + GLint iy; + /* scan across the line, bottom-to-top */ + for (iy = iyBot; iy < iyTop; iy++) { + (*plot)(ctx, line, pb, ix, iy); + } + yBot += dydx; + yTop += dydx; + } + } + else { + /* Y-major line */ + GLfloat dxdy = line->dx / line->dy; + GLfloat yBot, yTop, xLeft, xRight; + GLint iy, iyTop; + if (y0 < y1) { + yBot = y0 - line->halfWidth; + yTop = y1 + line->halfWidth; + if (line->dx >= 0.0) { + xLeft = x0 - 3.0 * line->halfWidth; + xRight = x0 + line->halfWidth; + } + else { + xLeft = x0 - line->halfWidth; + xRight = x0 + 3.0 * line->halfWidth; + } + } + else { + yBot = y1 - line->halfWidth; + yTop = y0 + line->halfWidth; + if (line->dx <= 0.0) { + xLeft = x1 - 3.0 * line->halfWidth; + xRight = x1 + line->halfWidth; + } + else { + xLeft = x1 - line->halfWidth; + xRight = x1 + 3.0 * line->halfWidth; + } + } + + /* scan along the line, bottom-to-top */ + iyTop = (GLint) (yTop + 1.0F); + + /*printf("avg span width: %g\n", xRight - xLeft);*/ + for (iy = (GLint) yBot; iy < iyTop; iy++) { + const GLint ixLeft = (GLint) xLeft; + const GLint ixRight = (GLint) (xRight + 1.0F); + GLint ix; + /* scan across the line, left-to-right */ + for (ix = ixLeft; ix < ixRight; ix++) { + (*plot)(ctx, line, pb, ix, iy); + } + xLeft += dxdy; + xRight += dxdy; + } + } +} + + +#define NAME(x) aa_ci_##x +#define DO_Z +#define DO_FOG +#define DO_INDEX +#include "s_aalinetemp.h" + + +#define NAME(x) aa_rgba_##x +#define DO_Z +#define DO_FOG +#define DO_RGBA +#include "s_aalinetemp.h" + + +#define NAME(x) aa_tex_rgba_##x +#define DO_Z +#define DO_FOG +#define DO_RGBA +#define DO_TEX +#include "s_aalinetemp.h" + + +#define NAME(x) aa_multitex_rgba_##x +#define DO_Z +#define DO_RGBA +#define DO_MULTITEX +#define DO_SPEC +#include "s_aalinetemp.h" + + + +void +_swrast_choose_aa_line_function(GLcontext *ctx) +{ + SWcontext *swrast = SWRAST_CONTEXT(ctx); + + ASSERT(ctx->Line.SmoothFlag); + + if (ctx->Visual.RGBAflag) { + /* RGBA */ + if (ctx->Texture._ReallyEnabled) { + if (ctx->Texture._MultiTextureEnabled + || ctx->Light.Model.ColorControl==GL_SEPARATE_SPECULAR_COLOR + || ctx->Fog.ColorSumEnabled) + /* Multitextured! */ + swrast->Line = aa_multitex_rgba_line; + else + swrast->Line = aa_tex_rgba_line; + } + else { + swrast->Line = aa_rgba_line; + } + } + else { + /* Color Index */ + swrast->Line = aa_ci_line; + } +} + diff --git a/src/mesa/swrast/s_aaline.h b/src/mesa/swrast/s_aaline.h new file mode 100644 index 00000000000..a39c5b525e4 --- /dev/null +++ b/src/mesa/swrast/s_aaline.h @@ -0,0 +1,40 @@ +/* $Id: s_aaline.h,v 1.1 2000/11/05 23:15:16 brianp Exp $ */ + +/* + * Mesa 3-D graphics library + * Version: 3.5 + * + * Copyright (C) 1999-2000 Brian Paul All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + + +#ifndef S_AALINE_H +#define S_AALINE_H + + +#include "types.h" +#include "swrast.h" + + +extern void +_swrast_choose_aa_line_function(GLcontext *ctx); + + +#endif diff --git a/src/mesa/swrast/s_aalinetemp.h b/src/mesa/swrast/s_aalinetemp.h new file mode 100644 index 00000000000..ee414aae596 --- /dev/null +++ b/src/mesa/swrast/s_aalinetemp.h @@ -0,0 +1,322 @@ +/* $Id: s_aalinetemp.h,v 1.1 2000/11/05 23:15:16 brianp Exp $ */ + +/* + * Mesa 3-D graphics library + * Version: 3.5 + * + * Copyright (C) 1999-2000 Brian Paul All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included + * in all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * BRIAN PAUL BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN + * AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + */ + + +/* + * Antialiased line template. + */ + + +/* + * Function to render each fragment in the AA line. + */ +static void +NAME(plot)(GLcontext *ctx, const struct LineInfo *line, + struct pixel_buffer *pb, int ix, int iy) +{ + const GLfloat fx = (GLfloat) ix; + const GLfloat fy = (GLfloat) iy; + const GLfloat coverage = compute_coveragef(line, ix, iy); + GLdepth z; + GLfloat fog; + GLchan red, green, blue, alpha; + GLint frac, indx, index; + GLchan specRed, specGreen, specBlue; + GLfloat tex[MAX_TEXTURE_UNITS][4], lambda[MAX_TEXTURE_UNITS]; + + if (coverage == 0.0) + return; + + /* + * Compute Z, color, texture coords, fog for the fragment by + * solving the plane equations at (ix,iy). + */ +#ifdef DO_Z + z = (GLdepth) solve_plane(fx, fy, line->zPlane); +#else + z = 0.0; +#endif +#ifdef DO_FOG + fog = solve_plane(fx, fy, line->fPlane); +#else + fog = 0.0; +#endif +#ifdef DO_RGBA + red = solve_plane_chan(fx, fy, line->rPlane); + green = solve_plane_chan(fx, fy, line->gPlane); + blue = solve_plane_chan(fx, fy, line->bPlane); + alpha = (GLchan) (solve_plane_chan(fx, fy, line->aPlane) * coverage);; +#else + (void) red; + (void) green; + (void) blue; + (void) alpha; +#endif +#ifdef DO_INDEX + frac = (GLint) (15.0 * coverage); + indx = (GLint) solve_plane(fx, fy, line->iPlane); + index = (indx & ~0xf) | frac; +#else + (void) frac; + (void) indx; + (void) index; +#endif +#ifdef DO_SPEC + specRed = solve_plane_chan(fx, fy, line->srPlane); + specGreen = solve_plane_chan(fx, fy, line->sgPlane); + specBlue = solve_plane_chan(fx, fy, line->sbPlane); +#else + (void) specRed; + (void) specGreen; + (void) specBlue; +#endif +#ifdef DO_TEX + { + GLfloat invQ = solve_plane_recip(fx, fy, line->vPlane[0]); + tex[0][0] = solve_plane(fx, fy, line->sPlane[0]) * invQ; + tex[0][1] = solve_plane(fx, fy, line->tPlane[0]) * invQ; + tex[0][2] = solve_plane(fx, fy, line->uPlane[0]) * invQ; + lambda[0] = compute_lambda(line->sPlane[0], line->tPlane[0], invQ, + line->texWidth[0], line->texHeight[0]); + } +#elif defined(DO_MULTITEX) + { + GLuint unit; + for (unit = 0; unit < ctx->Const.MaxTextureUnits; unit++) { + if (ctx->Texture.Unit[unit]._ReallyEnabled) { + GLfloat invQ = solve_plane_recip(fx, fy, line->vPlane[unit]); + tex[unit][0] = solve_plane(fx, fy, line->sPlane[unit]) * invQ; + tex[unit][1] = solve_plane(fx, fy, line->tPlane[unit]) * invQ; + tex[unit][2] = solve_plane(fx, fy, line->uPlane[unit]) * invQ; + lambda[unit] = compute_lambda(line->sPlane[unit], + line->tPlane[unit], invQ, + line->texWidth[unit], line->texHeight[unit]); + } + } + } +#else + (void) tex[0][0]; + (void) lambda[0]; +#endif + + +#if defined(DO_MULTITEX) +#if defined(DO_SPEC) + PB_WRITE_MULTITEX_SPEC_PIXEL(pb, ix, iy, z, fog, red, green, blue, alpha, + specRed, specGreen, specBlue, tex); +#else + PB_WRITE_MULTITEX_PIXEL(pb, ix, iy, z, fog, red, green, blue, alpha, texcoords); +#endif +#elif defined(DO_TEX) + PB_WRITE_TEX_PIXEL(pb, ix, iy, z, fog, red, green, blue, alpha, + tex[0][0], tex[0][1], tex[0][2]); +#elif defined(DO_RGBA) + PB_WRITE_RGBA_PIXEL(pb, ix, iy, z, fog, red, green, blue, alpha); +#elif defined(DO_INDEX) + PB_WRITE_CI_PIXEL(pb, ix, iy, z, fog, index); +#endif + + PB_CHECK_FLUSH(ctx, pb); +} + + + +/* + * Line setup + */ +static void +NAME(line)(GLcontext *ctx, SWvertex *v0, SWvertex *v1) +{ + SWcontext *swrast = SWRAST_CONTEXT(ctx); + struct pixel_buffer *pb = SWRAST_CONTEXT(ctx)->PB; + GLfloat tStart, tEnd; /* segment start, end along line length */ + GLboolean inSegment; + GLint iLen, i; + + /* Init the LineInfo struct */ + struct LineInfo line; + line.x0 = v0->win[0]; + line.y0 = v0->win[1]; + line.x1 = v1->win[0]; + line.y1 = v1->win[1]; + line.dx = line.x1 - line.x0; + line.dy = line.y1 - line.y0; + line.len = sqrt(line.dx * line.dx + line.dy * line.dy); + line.halfWidth = 0.5F * ctx->Line.Width; + line.xAdj = line.dx / line.len * line.halfWidth; + line.yAdj = line.dy / line.len * line.halfWidth; + +#ifdef DO_Z + compute_plane(line.x0, line.y0, line.x1, line.y1, + v0->win[2], v1->win[2], line.zPlane); +#endif +#ifdef DO_FOG + compute_plane(line.x0, line.y0, line.x1, line.y1, + v0->fog, v1->fog, line.fPlane); +#endif +#ifdef DO_RGBA + if (ctx->Light.ShadeModel == GL_SMOOTH) { + compute_plane(line.x0, line.y0, line.x1, line.y1, + v0->color[RCOMP], v1->color[RCOMP], line.rPlane); + compute_plane(line.x0, line.y0, line.x1, line.y1, + v0->color[GCOMP], v1->color[GCOMP], line.gPlane); + compute_plane(line.x0, line.y0, line.x1, line.y1, + v0->color[BCOMP], v1->color[BCOMP], line.bPlane); + compute_plane(line.x0, line.y0, line.x1, line.y1, + v0->color[ACOMP], v1->color[ACOMP], line.aPlane); + } + else { + constant_plane(v0->color[RCOMP], line.rPlane); + constant_plane(v0->color[GCOMP], line.gPlane); + constant_plane(v0->color[BCOMP], line.bPlane); + constant_plane(v0->color[ACOMP], line.aPlane); + } +#endif +#ifdef DO_SPEC + if (ctx->Light.ShadeModel == GL_SMOOTH) { + compute_plane(line.x0, line.y0, line.x1, line.y1, + v0->specular[RCOMP], v1->specular[RCOMP], line.srPlane); + compute_plane(line.x0, line.y0, line.x1, line.y1, + v0->specular[GCOMP], v1->specular[GCOMP], line.sgPlane); + compute_plane(line.x0, line.y0, line.x1, line.y1, + v0->specular[BCOMP], v1->specular[BCOMP], line.sbPlane); + } + else { + constant_plane(v0->specular[RCOMP], line.srPlane); + constant_plane(v0->specular[GCOMP], line.sgPlane); + constant_plane(v0->specular[BCOMP], line.sbPlane); + } +#endif +#ifdef DO_INDEX + if (ctx->Light.ShadeModel == GL_SMOOTH) { + compute_plane(line.x0, line.y0, line.x1, line.y1, + v0->index, v1->index, line.iPlane); + } + else { + constant_plane(v0->index, line.iPlane); + } +#endif +#ifdef DO_TEX + { + const struct gl_texture_object *obj = ctx->Texture.Unit[0]._Current; + const struct gl_texture_image *texImage = obj->Image[obj->BaseLevel]; + const GLfloat invW0 = v0->win[3]; + const GLfloat invW1 = v1->win[3]; + const GLfloat s0 = v0->texcoord[0][0] * invW0; + const GLfloat s1 = v1->texcoord[0][0] * invW1; + const GLfloat t0 = v0->texcoord[0][1] * invW0; + const GLfloat t1 = v1->texcoord[0][1] * invW0; + const GLfloat r0 = v0->texcoord[0][2] * invW0; + const GLfloat r1 = v1->texcoord[0][2] * invW0; + const GLfloat q0 = v0->texcoord[0][3] * invW0; + const GLfloat q1 = v1->texcoord[0][3] * invW0; + compute_plane(line.x0, line.y0, line.x1, line.y1, s0, s1, line.sPlane[0]); + compute_plane(line.x0, line.y0, line.x1, line.y1, t0, t1, line.tPlane[0]); + compute_plane(line.x0, line.y0, line.x1, line.y1, r0, r1, line.uPlane[0]); + compute_plane(line.x0, line.y0, line.x1, line.y1, q0, q1, line.vPlane[0]); + line.texWidth[0] = (GLfloat) texImage->Width; + line.texHeight[0] = (GLfloat) texImage->Height; + } +#elif defined(DO_MULITEX) + { + GLuint u; + for (u = 0; u < ctx->Const.MaxTextureUnits; u++) { + if (ctx->Texture.Unit[u].ReallyEnabled) { + const struct gl_texture_object *obj = ctx->Texture.Unit[u].Current; + const struct gl_texture_image *texImage = obj->Image[obj->BaseLevel]; + const GLfloat invW0 = v0->win[3]; + const GLfloat invW1 = v1->win[3]; + GLfloat (*texCoord)[4] = VB->TexCoordPtr[u]->data; + const GLfloat s0 = v0->texcoord[u][0] * invW0; + const GLfloat s1 = v1->texcoord[u][0] * invW1; + const GLfloat t0 = v0->texcoord[u][1] * invW0; + const GLfloat t1 = v1->texcoord[u][1] * invW0; + const GLfloat r0 = v0->texcoord[u][2] * invW0; + const GLfloat r1 = v1->texcoord[u][2] * invW0; + const GLfloat q0 = v0->texcoord[u][3] * invW0; + const GLfloat q1 = v1->texcoord[u][3] * invW0; + compute_plane(line.x0, line.y0, line.x1, line.y1, s0, s1, line.sPlane[u]); + compute_plane(line.x0, line.y0, line.x1, line.y1, t0, t1, line.tPlane[u]); + compute_plane(line.x0, line.y0, line.x1, line.y1, u0, u1, line.uPlane[u]); + compute_plane(line.x0, line.y0, line.x1, line.y1, v0, v1, line.vPlane[u]); + line.texWidth[u] = (GLfloat) texImage->Width; + line.texHeight[u] = (GLfloat) texImage->Height; + } + } + } +#endif + + tStart = tEnd = 0.0; + inSegment = GL_FALSE; + iLen = (GLint) line.len; + + if (ctx->Line.StippleFlag) { + for (i = 0; i < iLen; i++) { + const GLuint bit = (swrast->StippleCounter / ctx->Line.StippleFactor) & 0xf; + if ((1 << bit) & ctx->Line.StipplePattern) { + /* stipple bit is on */ + const GLfloat t = (GLfloat) i / (GLfloat) line.len; + if (!inSegment) { + /* start new segment */ + inSegment = GL_TRUE; + tStart = t; + } + else { + /* still in the segment, extend it */ + tEnd = t; + } + } + else { + /* stipple bit is off */ + if (inSegment && (tEnd > tStart)) { + /* draw the segment */ + segment(ctx, &line, NAME(plot), pb, tStart, tEnd); + inSegment = GL_FALSE; + } + else { + /* still between segments, do nothing */ + } + } + swrast->StippleCounter++; + } + } + else { + /* non-stippled */ + segment(ctx, &line, NAME(plot), pb, 0.0, 1.0); + } +} + + + + +#undef DO_Z +#undef DO_FOG +#undef DO_RGBA +#undef DO_INDEX +#undef DO_SPEC +#undef DO_TEX +#undef DO_MULTITEX +#undef NAME |