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Diffstat (limited to 'QW/client/gl_warp.c')
| -rw-r--r-- | QW/client/gl_warp.c | 1087 |
1 files changed, 1087 insertions, 0 deletions
diff --git a/QW/client/gl_warp.c b/QW/client/gl_warp.c new file mode 100644 index 0000000..a7ac7f9 --- /dev/null +++ b/QW/client/gl_warp.c @@ -0,0 +1,1087 @@ +/* +Copyright (C) 1996-1997 Id Software, Inc. + +This program is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License +as published by the Free Software Foundation; either version 2 +of the License, or (at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. + +See the GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +*/ +// gl_warp.c -- sky and water polygons + +#include "quakedef.h" + +extern model_t *loadmodel; + +int skytexturenum; + +int solidskytexture; +int alphaskytexture; +float speedscale; // for top sky and bottom sky + +msurface_t *warpface; + +extern cvar_t gl_subdivide_size; + +void BoundPoly (int numverts, float *verts, vec3_t mins, vec3_t maxs) +{ + int i, j; + float *v; + + mins[0] = mins[1] = mins[2] = 9999; + maxs[0] = maxs[1] = maxs[2] = -9999; + v = verts; + for (i=0 ; i<numverts ; i++) + for (j=0 ; j<3 ; j++, v++) + { + if (*v < mins[j]) + mins[j] = *v; + if (*v > maxs[j]) + maxs[j] = *v; + } +} + +void SubdividePolygon (int numverts, float *verts) +{ + int i, j, k; + vec3_t mins, maxs; + float m; + float *v; + vec3_t front[64], back[64]; + int f, b; + float dist[64]; + float frac; + glpoly_t *poly; + float s, t; + + if (numverts > 60) + Sys_Error ("numverts = %i", numverts); + + BoundPoly (numverts, verts, mins, maxs); + + for (i=0 ; i<3 ; i++) + { + m = (mins[i] + maxs[i]) * 0.5; + m = gl_subdivide_size.value * floor (m/gl_subdivide_size.value + 0.5); + if (maxs[i] - m < 8) + continue; + if (m - mins[i] < 8) + continue; + + // cut it + v = verts + i; + for (j=0 ; j<numverts ; j++, v+= 3) + dist[j] = *v - m; + + // wrap cases + dist[j] = dist[0]; + v-=i; + VectorCopy (verts, v); + + f = b = 0; + v = verts; + for (j=0 ; j<numverts ; j++, v+= 3) + { + if (dist[j] >= 0) + { + VectorCopy (v, front[f]); + f++; + } + if (dist[j] <= 0) + { + VectorCopy (v, back[b]); + b++; + } + if (dist[j] == 0 || dist[j+1] == 0) + continue; + if ( (dist[j] > 0) != (dist[j+1] > 0) ) + { + // clip point + frac = dist[j] / (dist[j] - dist[j+1]); + for (k=0 ; k<3 ; k++) + front[f][k] = back[b][k] = v[k] + frac*(v[3+k] - v[k]); + f++; + b++; + } + } + + SubdividePolygon (f, front[0]); + SubdividePolygon (b, back[0]); + return; + } + + poly = Hunk_Alloc (sizeof(glpoly_t) + (numverts-4) * VERTEXSIZE*sizeof(float)); + poly->next = warpface->polys; + warpface->polys = poly; + poly->numverts = numverts; + for (i=0 ; i<numverts ; i++, verts+= 3) + { + VectorCopy (verts, poly->verts[i]); + s = DotProduct (verts, warpface->texinfo->vecs[0]); + t = DotProduct (verts, warpface->texinfo->vecs[1]); + poly->verts[i][3] = s; + poly->verts[i][4] = t; + } +} + +/* +================ +GL_SubdivideSurface + +Breaks a polygon up along axial 64 unit +boundaries so that turbulent and sky warps +can be done reasonably. +================ +*/ +void GL_SubdivideSurface (msurface_t *fa) +{ + vec3_t verts[64]; + int numverts; + int i; + int lindex; + float *vec; + + warpface = fa; + + // + // convert edges back to a normal polygon + // + numverts = 0; + for (i=0 ; i<fa->numedges ; i++) + { + lindex = loadmodel->surfedges[fa->firstedge + i]; + + if (lindex > 0) + vec = loadmodel->vertexes[loadmodel->edges[lindex].v[0]].position; + else + vec = loadmodel->vertexes[loadmodel->edges[-lindex].v[1]].position; + VectorCopy (vec, verts[numverts]); + numverts++; + } + + SubdividePolygon (numverts, verts[0]); +} + +//========================================================= + + + +// speed up sin calculations - Ed +float turbsin[] = +{ + #include "gl_warp_sin.h" +}; +#define TURBSCALE (256.0 / (2 * M_PI)) + +/* +============= +EmitWaterPolys + +Does a water warp on the pre-fragmented glpoly_t chain +============= +*/ +void EmitWaterPolys (msurface_t *fa) +{ + glpoly_t *p; + float *v; + int i; + float s, t, os, ot; + + + for (p=fa->polys ; p ; p=p->next) + { + glBegin (GL_POLYGON); + for (i=0,v=p->verts[0] ; i<p->numverts ; i++, v+=VERTEXSIZE) + { + os = v[3]; + ot = v[4]; + + s = os + turbsin[(int)((ot*0.125+realtime) * TURBSCALE) & 255]; + s *= (1.0/64); + + t = ot + turbsin[(int)((os*0.125+realtime) * TURBSCALE) & 255]; + t *= (1.0/64); + + glTexCoord2f (s, t); + glVertex3fv (v); + } + glEnd (); + } +} + + + + +/* +============= +EmitSkyPolys +============= +*/ +void EmitSkyPolys (msurface_t *fa) +{ + glpoly_t *p; + float *v; + int i; + float s, t; + vec3_t dir; + float length; + + for (p=fa->polys ; p ; p=p->next) + { + glBegin (GL_POLYGON); + for (i=0,v=p->verts[0] ; i<p->numverts ; i++, v+=VERTEXSIZE) + { + VectorSubtract (v, r_origin, dir); + dir[2] *= 3; // flatten the sphere + + length = dir[0]*dir[0] + dir[1]*dir[1] + dir[2]*dir[2]; + length = sqrt (length); + length = 6*63/length; + + dir[0] *= length; + dir[1] *= length; + + s = (speedscale + dir[0]) * (1.0/128); + t = (speedscale + dir[1]) * (1.0/128); + + glTexCoord2f (s, t); + glVertex3fv (v); + } + glEnd (); + } +} + +/* +=============== +EmitBothSkyLayers + +Does a sky warp on the pre-fragmented glpoly_t chain +This will be called for brushmodels, the world +will have them chained together. +=============== +*/ +void EmitBothSkyLayers (msurface_t *fa) +{ + GL_DisableMultitexture(); + + GL_Bind (solidskytexture); + speedscale = realtime*8; + speedscale -= (int)speedscale & ~127 ; + + EmitSkyPolys (fa); + + glEnable (GL_BLEND); + GL_Bind (alphaskytexture); + speedscale = realtime*16; + speedscale -= (int)speedscale & ~127 ; + + EmitSkyPolys (fa); + + glDisable (GL_BLEND); +} + +#ifndef QUAKE2 +/* +================= +R_DrawSkyChain +================= +*/ +void R_DrawSkyChain (msurface_t *s) +{ + msurface_t *fa; + + GL_DisableMultitexture(); + + // used when gl_texsort is on + GL_Bind(solidskytexture); + speedscale = realtime*8; + speedscale -= (int)speedscale & ~127 ; + + for (fa=s ; fa ; fa=fa->texturechain) + EmitSkyPolys (fa); + + glEnable (GL_BLEND); + GL_Bind (alphaskytexture); + speedscale = realtime*16; + speedscale -= (int)speedscale & ~127 ; + + for (fa=s ; fa ; fa=fa->texturechain) + EmitSkyPolys (fa); + + glDisable (GL_BLEND); +} + +#endif + +/* +================================================================= + + Quake 2 environment sky + +================================================================= +*/ + +#ifdef QUAKE2 + + +#define SKY_TEX 2000 + +/* +================================================================= + + PCX Loading + +================================================================= +*/ + +typedef struct +{ + char manufacturer; + char version; + char encoding; + char bits_per_pixel; + unsigned short xmin,ymin,xmax,ymax; + unsigned short hres,vres; + unsigned char palette[48]; + char reserved; + char color_planes; + unsigned short bytes_per_line; + unsigned short palette_type; + char filler[58]; + unsigned data; // unbounded +} pcx_t; + +byte *pcx_rgb; + +/* +============ +LoadPCX +============ +*/ +void LoadPCX (FILE *f) +{ + pcx_t *pcx, pcxbuf; + byte palette[768]; + byte *pix; + int x, y; + int dataByte, runLength; + int count; + +// +// parse the PCX file +// + fread (&pcxbuf, 1, sizeof(pcxbuf), f); + + pcx = &pcxbuf; + + if (pcx->manufacturer != 0x0a + || pcx->version != 5 + || pcx->encoding != 1 + || pcx->bits_per_pixel != 8 + || pcx->xmax >= 320 + || pcx->ymax >= 256) + { + Con_Printf ("Bad pcx file\n"); + return; + } + + // seek to palette + fseek (f, -768, SEEK_END); + fread (palette, 1, 768, f); + + fseek (f, sizeof(pcxbuf) - 4, SEEK_SET); + + count = (pcx->xmax+1) * (pcx->ymax+1); + pcx_rgb = malloc( count * 4); + + for (y=0 ; y<=pcx->ymax ; y++) + { + pix = pcx_rgb + 4*y*(pcx->xmax+1); + for (x=0 ; x<=pcx->ymax ; ) + { + dataByte = fgetc(f); + + if((dataByte & 0xC0) == 0xC0) + { + runLength = dataByte & 0x3F; + dataByte = fgetc(f); + } + else + runLength = 1; + + while(runLength-- > 0) + { + pix[0] = palette[dataByte*3]; + pix[1] = palette[dataByte*3+1]; + pix[2] = palette[dataByte*3+2]; + pix[3] = 255; + pix += 4; + x++; + } + } + } +} + +/* +========================================================= + +TARGA LOADING + +========================================================= +*/ + +typedef struct _TargaHeader { + unsigned char id_length, colormap_type, image_type; + unsigned short colormap_index, colormap_length; + unsigned char colormap_size; + unsigned short x_origin, y_origin, width, height; + unsigned char pixel_size, attributes; +} TargaHeader; + + +TargaHeader targa_header; +byte *targa_rgba; + +int fgetLittleShort (FILE *f) +{ + byte b1, b2; + + b1 = fgetc(f); + b2 = fgetc(f); + + return (short)(b1 + b2*256); +} + +int fgetLittleLong (FILE *f) +{ + byte b1, b2, b3, b4; + + b1 = fgetc(f); + b2 = fgetc(f); + b3 = fgetc(f); + b4 = fgetc(f); + + return b1 + (b2<<8) + (b3<<16) + (b4<<24); +} + + +/* +============= +LoadTGA +============= +*/ +void LoadTGA (FILE *fin) +{ + int columns, rows, numPixels; + byte *pixbuf; + int row, column; + + targa_header.id_length = fgetc(fin); + targa_header.colormap_type = fgetc(fin); + targa_header.image_type = fgetc(fin); + + targa_header.colormap_index = fgetLittleShort(fin); + targa_header.colormap_length = fgetLittleShort(fin); + targa_header.colormap_size = fgetc(fin); + targa_header.x_origin = fgetLittleShort(fin); + targa_header.y_origin = fgetLittleShort(fin); + targa_header.width = fgetLittleShort(fin); + targa_header.height = fgetLittleShort(fin); + targa_header.pixel_size = fgetc(fin); + targa_header.attributes = fgetc(fin); + + if (targa_header.image_type!=2 + && targa_header.image_type!=10) + Sys_Error ("LoadTGA: Only type 2 and 10 targa RGB images supported\n"); + + if (targa_header.colormap_type !=0 + || (targa_header.pixel_size!=32 && targa_header.pixel_size!=24)) + Sys_Error ("Texture_LoadTGA: Only 32 or 24 bit images supported (no colormaps)\n"); + + columns = targa_header.width; + rows = targa_header.height; + numPixels = columns * rows; + + targa_rgba = malloc (numPixels*4); + + if (targa_header.id_length != 0) + fseek(fin, targa_header.id_length, SEEK_CUR); // skip TARGA image comment + + if (targa_header.image_type==2) { // Uncompressed, RGB images + for(row=rows-1; row>=0; row--) { + pixbuf = targa_rgba + row*columns*4; + for(column=0; column<columns; column++) { + unsigned char red,green,blue,alphabyte; + switch (targa_header.pixel_size) { + case 24: + + blue = getc(fin); + green = getc(fin); + red = getc(fin); + *pixbuf++ = red; + *pixbuf++ = green; + *pixbuf++ = blue; + *pixbuf++ = 255; + break; + case 32: + blue = getc(fin); + green = getc(fin); + red = getc(fin); + alphabyte = getc(fin); + *pixbuf++ = red; + *pixbuf++ = green; + *pixbuf++ = blue; + *pixbuf++ = alphabyte; + break; + } + } + } + } + else if (targa_header.image_type==10) { // Runlength encoded RGB images + unsigned char red,green,blue,alphabyte,packetHeader,packetSize,j; + for(row=rows-1; row>=0; row--) { + pixbuf = targa_rgba + row*columns*4; + for(column=0; column<columns; ) { + packetHeader=getc(fin); + packetSize = 1 + (packetHeader & 0x7f); + if (packetHeader & 0x80) { // run-length packet + switch (targa_header.pixel_size) { + case 24: + blue = getc(fin); + green = getc(fin); + red = getc(fin); + alphabyte = 255; + break; + case 32: + blue = getc(fin); + green = getc(fin); + red = getc(fin); + alphabyte = getc(fin); + break; + } + + for(j=0;j<packetSize;j++) { + *pixbuf++=red; + *pixbuf++=green; + *pixbuf++=blue; + *pixbuf++=alphabyte; + column++; + if (column==columns) { // run spans across rows + column=0; + if (row>0) + row--; + else + goto breakOut; + pixbuf = targa_rgba + row*columns*4; + } + } + } + else { // non run-length packet + for(j=0;j<packetSize;j++) { + switch (targa_header.pixel_size) { + case 24: + blue = getc(fin); + green = getc(fin); + red = getc(fin); + *pixbuf++ = red; + *pixbuf++ = green; + *pixbuf++ = blue; + *pixbuf++ = 255; + break; + case 32: + blue = getc(fin); + green = getc(fin); + red = getc(fin); + alphabyte = getc(fin); + *pixbuf++ = red; + *pixbuf++ = green; + *pixbuf++ = blue; + *pixbuf++ = alphabyte; + break; + } + column++; + if (column==columns) { // pixel packet run spans across rows + column=0; + if (row>0) + row--; + else + goto breakOut; + pixbuf = targa_rgba + row*columns*4; + } + } + } + } + breakOut:; + } + } + + fclose(fin); +} + +/* +================== +R_LoadSkys +================== +*/ +char *suf[6] = {"rt", "bk", "lf", "ft", "up", "dn"}; +void R_LoadSkys (void) +{ + int i; + FILE *f; + char name[64]; + + for (i=0 ; i<6 ; i++) + { + GL_Bind (SKY_TEX + i); + sprintf (name, "gfx/env/bkgtst%s.tga", suf[i]); + COM_FOpenFile (name, &f); + if (!f) + { + Con_Printf ("Couldn't load %s\n", name); + continue; + } + LoadTGA (f); +// LoadPCX (f); + + glTexImage2D (GL_TEXTURE_2D, 0, gl_solid_format, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, targa_rgba); +// glTexImage2D (GL_TEXTURE_2D, 0, gl_solid_format, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, pcx_rgb); + + free (targa_rgba); +// free (pcx_rgb); + + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + } +} + + +vec3_t skyclip[6] = { + {1,1,0}, + {1,-1,0}, + {0,-1,1}, + {0,1,1}, + {1,0,1}, + {-1,0,1} +}; +int c_sky; + +// 1 = s, 2 = t, 3 = 2048 +int st_to_vec[6][3] = +{ + {3,-1,2}, + {-3,1,2}, + + {1,3,2}, + {-1,-3,2}, + + {-2,-1,3}, // 0 degrees yaw, look straight up + {2,-1,-3} // look straight down + +// {-1,2,3}, +// {1,2,-3} +}; + +// s = [0]/[2], t = [1]/[2] +int vec_to_st[6][3] = +{ + {-2,3,1}, + {2,3,-1}, + + {1,3,2}, + {-1,3,-2}, + + {-2,-1,3}, + {-2,1,-3} + +// {-1,2,3}, +// {1,2,-3} +}; + +float skymins[2][6], skymaxs[2][6]; + +void DrawSkyPolygon (int nump, vec3_t vecs) +{ + int i,j; + vec3_t v, av; + float s, t, dv; + int axis; + float *vp; + + c_sky++; +#if 0 +glBegin (GL_POLYGON); +for (i=0 ; i<nump ; i++, vecs+=3) +{ + VectorAdd(vecs, r_origin, v); + glVertex3fv (v); +} +glEnd(); +return; +#endif + // decide which face it maps to + VectorCopy (vec3_origin, v); + for (i=0, vp=vecs ; i<nump ; i++, vp+=3) + { + VectorAdd (vp, v, v); + } + av[0] = fabs(v[0]); + av[1] = fabs(v[1]); + av[2] = fabs(v[2]); + if (av[0] > av[1] && av[0] > av[2]) + { + if (v[0] < 0) + axis = 1; + else + axis = 0; + } + else if (av[1] > av[2] && av[1] > av[0]) + { + if (v[1] < 0) + axis = 3; + else + axis = 2; + } + else + { + if (v[2] < 0) + axis = 5; + else + axis = 4; + } + + // project new texture coords + for (i=0 ; i<nump ; i++, vecs+=3) + { + j = vec_to_st[axis][2]; + if (j > 0) + dv = vecs[j - 1]; + else + dv = -vecs[-j - 1]; + + j = vec_to_st[axis][0]; + if (j < 0) + s = -vecs[-j -1] / dv; + else + s = vecs[j-1] / dv; + j = vec_to_st[axis][1]; + if (j < 0) + t = -vecs[-j -1] / dv; + else + t = vecs[j-1] / dv; + + if (s < skymins[0][axis]) + skymins[0][axis] = s; + if (t < skymins[1][axis]) + skymins[1][axis] = t; + if (s > skymaxs[0][axis]) + skymaxs[0][axis] = s; + if (t > skymaxs[1][axis]) + skymaxs[1][axis] = t; + } +} + +#define MAX_CLIP_VERTS 64 +void ClipSkyPolygon (int nump, vec3_t vecs, int stage) +{ + float *norm; + float *v; + qboolean front, back; + float d, e; + float dists[MAX_CLIP_VERTS]; + int sides[MAX_CLIP_VERTS]; + vec3_t newv[2][MAX_CLIP_VERTS]; + int newc[2]; + int i, j; + + if (nump > MAX_CLIP_VERTS-2) + Sys_Error ("ClipSkyPolygon: MAX_CLIP_VERTS"); + if (stage == 6) + { // fully clipped, so draw it + DrawSkyPolygon (nump, vecs); + return; + } + + front = back = false; + norm = skyclip[stage]; + for (i=0, v = vecs ; i<nump ; i++, v+=3) + { + d = DotProduct (v, norm); + if (d > ON_EPSILON) + { + front = true; + sides[i] = SIDE_FRONT; + } + else if (d < ON_EPSILON) + { + back = true; + sides[i] = SIDE_BACK; + } + else + sides[i] = SIDE_ON; + dists[i] = d; + } + + if (!front || !back) + { // not clipped + ClipSkyPolygon (nump, vecs, stage+1); + return; + } + + // clip it + sides[i] = sides[0]; + dists[i] = dists[0]; + VectorCopy (vecs, (vecs+(i*3)) ); + newc[0] = newc[1] = 0; + + for (i=0, v = vecs ; i<nump ; i++, v+=3) + { + switch (sides[i]) + { + case SIDE_FRONT: + VectorCopy (v, newv[0][newc[0]]); + newc[0]++; + break; + case SIDE_BACK: + VectorCopy (v, newv[1][newc[1]]); + newc[1]++; + break; + case SIDE_ON: + VectorCopy (v, newv[0][newc[0]]); + newc[0]++; + VectorCopy (v, newv[1][newc[1]]); + newc[1]++; + break; + } + + if (sides[i] == SIDE_ON || sides[i+1] == SIDE_ON || sides[i+1] == sides[i]) + continue; + + d = dists[i] / (dists[i] - dists[i+1]); + for (j=0 ; j<3 ; j++) + { + e = v[j] + d*(v[j+3] - v[j]); + newv[0][newc[0]][j] = e; + newv[1][newc[1]][j] = e; + } + newc[0]++; + newc[1]++; + } + + // continue + ClipSkyPolygon (newc[0], newv[0][0], stage+1); + ClipSkyPolygon (newc[1], newv[1][0], stage+1); +} + +/* +================= +R_DrawSkyChain +================= +*/ +void R_DrawSkyChain (msurface_t *s) +{ + msurface_t *fa; + + int i; + vec3_t verts[MAX_CLIP_VERTS]; + glpoly_t *p; + + c_sky = 0; + GL_Bind(solidskytexture); + + // calculate vertex values for sky box + + for (fa=s ; fa ; fa=fa->texturechain) + { + for (p=fa->polys ; p ; p=p->next) + { + for (i=0 ; i<p->numverts ; i++) + { + VectorSubtract (p->verts[i], r_origin, verts[i]); + } + ClipSkyPolygon (p->numverts, verts[0], 0); + } + } +} + + +/* +============== +R_ClearSkyBox +============== +*/ +void R_ClearSkyBox (void) +{ + int i; + + for (i=0 ; i<6 ; i++) + { + skymins[0][i] = skymins[1][i] = 9999; + skymaxs[0][i] = skymaxs[1][i] = -9999; + } +} + + +void MakeSkyVec (float s, float t, int axis) +{ + vec3_t v, b; + int j, k; + + b[0] = s*2048; + b[1] = t*2048; + b[2] = 2048; + + for (j=0 ; j<3 ; j++) + { + k = st_to_vec[axis][j]; + if (k < 0) + v[j] = -b[-k - 1]; + else + v[j] = b[k - 1]; + v[j] += r_origin[j]; + } + + // avoid bilerp seam + s = (s+1)*0.5; + t = (t+1)*0.5; + + if (s < 1.0/512) + s = 1.0/512; + else if (s > 511.0/512) + s = 511.0/512; + if (t < 1.0/512) + t = 1.0/512; + else if (t > 511.0/512) + t = 511.0/512; + + t = 1.0 - t; + glTexCoord2f (s, t); + glVertex3fv (v); +} + +/* +============== +R_DrawSkyBox +============== +*/ +int skytexorder[6] = {0,2,1,3,4,5}; +void R_DrawSkyBox (void) +{ + int i, j, k; + vec3_t v; + float s, t; + +#if 0 +glEnable (GL_BLEND); +glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); +glColor4f (1,1,1,0.5); +glDisable (GL_DEPTH_TEST); +#endif + for (i=0 ; i<6 ; i++) + { + if (skymins[0][i] >= skymaxs[0][i] + || skymins[1][i] >= skymaxs[1][i]) + continue; + + GL_Bind (SKY_TEX+skytexorder[i]); +#if 0 +skymins[0][i] = -1; +skymins[1][i] = -1; +skymaxs[0][i] = 1; +skymaxs[1][i] = 1; +#endif + glBegin (GL_QUADS); + MakeSkyVec (skymins[0][i], skymins[1][i], i); + MakeSkyVec (skymins[0][i], skymaxs[1][i], i); + MakeSkyVec (skymaxs[0][i], skymaxs[1][i], i); + MakeSkyVec (skymaxs[0][i], skymins[1][i], i); + glEnd (); + } +#if 0 +glDisable (GL_BLEND); +glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_REPLACE); +glColor4f (1,1,1,0.5); +glEnable (GL_DEPTH_TEST); +#endif +} + + +#endif + +//=============================================================== + +/* +============= +R_InitSky + +A sky texture is 256*128, with the right side being a masked overlay +============== +*/ +void R_InitSky (texture_t *mt) +{ + int i, j, p; + byte *src; + unsigned trans[128*128]; + unsigned transpix; + int r, g, b; + unsigned *rgba; + extern int skytexturenum; + + src = (byte *)mt + mt->offsets[0]; + + // make an average value for the back to avoid + // a fringe on the top level + + r = g = b = 0; + for (i=0 ; i<128 ; i++) + for (j=0 ; j<128 ; j++) + { + p = src[i*256 + j + 128]; + rgba = &d_8to24table[p]; + trans[(i*128) + j] = *rgba; + r += ((byte *)rgba)[0]; + g += ((byte *)rgba)[1]; + b += ((byte *)rgba)[2]; + } + + ((byte *)&transpix)[0] = r/(128*128); + ((byte *)&transpix)[1] = g/(128*128); + ((byte *)&transpix)[2] = b/(128*128); + ((byte *)&transpix)[3] = 0; + + + if (!solidskytexture) + solidskytexture = texture_extension_number++; + GL_Bind (solidskytexture ); + glTexImage2D (GL_TEXTURE_2D, 0, gl_solid_format, 128, 128, 0, GL_RGBA, GL_UNSIGNED_BYTE, trans); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); + + + for (i=0 ; i<128 ; i++) + for (j=0 ; j<128 ; j++) + { + p = src[i*256 + j]; + if (p == 0) + trans[(i*128) + j] = transpix; + else + trans[(i*128) + j] = d_8to24table[p]; + } + + if (!alphaskytexture) + alphaskytexture = texture_extension_number++; + GL_Bind(alphaskytexture); + glTexImage2D (GL_TEXTURE_2D, 0, gl_alpha_format, 128, 128, 0, GL_RGBA, GL_UNSIGNED_BYTE, trans); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); + glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); +} + |