/* gl_warp.c sky and water polygons 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: Free Software Foundation, Inc. 59 Temple Place - Suite 330 Boston, MA 02111-1307, USA $Id$ */ #ifdef HAVE_CONFIG_H # include "config.h" #endif #include #include #include #include #ifdef HAVE_STRINGS_H #include #endif #include "QF/qtypes.h" #include "QF/console.h" #include "model.h" #include "QF/quakefs.h" #include "glquake.h" #include "QF/sys.h" extern double realtime; extern model_t *loadmodel; extern int skytexturenum; extern qboolean lighthalf; int solidskytexture; int alphaskytexture; float speedscale; // for top sky and bottom sky // Set to true if a valid skybox is loaded --KB qboolean skyloaded = false; 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; vec3_t nv; 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); VectorCopy (v, nv); nv[2] += r_waterripple->value * turbsin[(int) ((v[3] * 0.125 + realtime) * TURBSCALE) & 255] * turbsin[(int) ((v[4] * 0.125 + realtime) * TURBSCALE) & 255] * (1.0 / 64.0); glVertex3fv (nv); } glEnd (); } } /* ================================================================= Quake 2 environment sky ================================================================= */ #define SKY_TEX 2000 /* ========================================================= 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 (QFile *f) { byte b1, b2; b1 = Qgetc (f); b2 = Qgetc (f); return (short) (b1 + b2 * 256); } int fgetLittleLong (QFile *f) { byte b1, b2, b3, b4; b1 = Qgetc (f); b2 = Qgetc (f); b3 = Qgetc (f); b4 = Qgetc (f); return b1 + (b2 << 8) + (b3 << 16) + (b4 << 24); } /* ============= LoadTGA ============= */ void LoadTGA (QFile *fin) { int columns, rows, numPixels; byte *pixbuf; int row, column; unsigned char red = 0, green = 0, blue = 0, alphabyte = 0; targa_header.id_length = Qgetc (fin); targa_header.colormap_type = Qgetc (fin); targa_header.image_type = Qgetc (fin); targa_header.colormap_index = fgetLittleShort (fin); targa_header.colormap_length = fgetLittleShort (fin); targa_header.colormap_size = Qgetc (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 = Qgetc (fin); targa_header.attributes = Qgetc (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) Qseek (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++) { switch (targa_header.pixel_size) { case 24: blue = Qgetc (fin); green = Qgetc (fin); red = Qgetc (fin); *pixbuf++ = red; *pixbuf++ = green; *pixbuf++ = blue; *pixbuf++ = 255; break; case 32: blue = Qgetc (fin); green = Qgetc (fin); red = Qgetc (fin); alphabyte = Qgetc (fin); *pixbuf++ = red; *pixbuf++ = green; *pixbuf++ = blue; *pixbuf++ = alphabyte; break; } } } } else if (targa_header.image_type == 10) { // Runlength encoded RGB // images unsigned char packetHeader, packetSize, j; for (row = rows - 1; row >= 0; row--) { pixbuf = targa_rgba + row * columns * 4; for (column = 0; column < columns;) { packetHeader = Qgetc (fin); packetSize = 1 + (packetHeader & 0x7f); if (packetHeader & 0x80) { // run-length packet switch (targa_header.pixel_size) { case 24: blue = Qgetc (fin); green = Qgetc (fin); red = Qgetc (fin); alphabyte = 255; break; case 32: blue = Qgetc (fin); green = Qgetc (fin); red = Qgetc (fin); alphabyte = Qgetc (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 = Qgetc (fin); green = Qgetc (fin); red = Qgetc (fin); *pixbuf++ = red; *pixbuf++ = green; *pixbuf++ = blue; *pixbuf++ = 255; break; case 32: blue = Qgetc (fin); green = Qgetc (fin); red = Qgetc (fin); alphabyte = Qgetc (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:; } } Qclose (fin); } /* ================== R_LoadSkys ================== */ char *suf[6] = { "rt", "bk", "lf", "ft", "up", "dn" }; void R_LoadSkys (char *skyname) { int i; QFile *f; char name[64]; if (strcasecmp (skyname, "none") == 0) { skyloaded = false; return; } skyloaded = true; for (i = 0; i < 6; i++) { glBindTexture (GL_TEXTURE_2D, SKY_TEX + i); snprintf (name, sizeof (name), "env/%s%s.tga", skyname, suf[i]); COM_FOpenFile (name, &f); if (!f) { Con_DPrintf ("Couldn't load %s\n", name); skyloaded = false; continue; } LoadTGA (f); glTexImage2D (GL_TEXTURE_2D, 0, gl_solid_format, 256, 256, 0, GL_RGBA, GL_UNSIGNED_BYTE, targa_rgba); free (targa_rgba); glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR); glTexParameterf (GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR); } if (!skyloaded) Con_Printf ("Unable to load skybox %s, using normal sky\n", skyname); } void R_SkyBoxPolyVec (vec5_t v) { // avoid interpolation seams // s = s * (254.0/256.0) + (1.0/256.0); // t = t * (254.0/256.0) + (1.0/256.0); glTexCoord2fv (v); glVertex3f (r_refdef.vieworg[0] + v[2], r_refdef.vieworg[1] + v[3], r_refdef.vieworg[2] + v[4]); } #define ftc(x) (x * (254.0/256.0) + (1.0/256.0)) vec5_t skyvec[6][4] = { { // right {ftc (1), ftc (0), 1024, 1024, 1024}, {ftc (1), ftc (1), 1024, 1024, -1024}, {ftc (0), ftc (1), -1024, 1024, -1024}, {ftc (0), ftc (0), -1024, 1024, 1024} }, { // back {ftc (1), ftc (0), -1024, 1024, 1024}, {ftc (1), ftc (1), -1024, 1024, -1024}, {ftc (0), ftc (1), -1024, -1024, -1024}, {ftc (0), ftc (0), -1024, -1024, 1024} }, { // left {ftc (1), ftc (0), -1024, -1024, 1024}, {ftc (1), ftc (1), -1024, -1024, -1024}, {ftc (0), ftc (1), 1024, -1024, -1024}, {ftc (0), ftc (0), 1024, -1024, 1024} }, { // front {ftc (1), ftc (0), 1024, -1024, 1024}, {ftc (1), ftc (1), 1024, -1024, -1024}, {ftc (0), ftc (1), 1024, 1024, -1024}, {ftc (0), ftc (0), 1024, 1024, 1024} }, { // up {ftc (1), ftc (0), 1024, -1024, 1024}, {ftc (1), ftc (1), 1024, 1024, 1024}, {ftc (0), ftc (1), -1024, 1024, 1024}, {ftc (0), ftc (0), -1024, -1024, 1024} }, { // down {ftc (1), ftc (0), 1024, 1024, -1024}, {ftc (1), ftc (1), 1024, -1024, -1024}, {ftc (0), ftc (1), -1024, -1024, -1024}, {ftc (0), ftc (0), -1024, 1024, -1024} } }; #undef ftc void R_DrawSkyBox (void) { int i, j; glEnable (GL_DEPTH_TEST); glDepthFunc (GL_ALWAYS); // glDisable (GL_BLEND); // glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); glDepthRange (gldepthmax, gldepthmax); if (lighthalf) glColor3f (0.5, 0.5, 0.5); else glColor3f (1, 1, 1); for (i = 0; i < 6; i++) { glBindTexture (GL_TEXTURE_2D, SKY_TEX + i); glBegin (GL_QUADS); for (j = 0; j < 4; j++) R_SkyBoxPolyVec (skyvec[i][j]); glEnd (); } glColor3f (1, 1, 1); glDepthFunc (GL_LEQUAL); glEnable (GL_DEPTH_TEST); glDepthRange (gldepthmin, gldepthmax); } vec3_t domescale; void R_DrawSkyLayer (float s) { int a, b; float x, y, a1x, a1y, a2x, a2y; vec3_t v; for (a = 0; a < 16; a++) { a1x = bubble_costable[a * 2]; a1y = -bubble_sintable[a * 2]; a2x = bubble_costable[(a + 1) * 2]; a2y = -bubble_sintable[(a + 1) * 2]; glBegin (GL_TRIANGLE_STRIP); glTexCoord2f (0.5 + s * (1.0 / 128.0), 0.5 + s * (1.0 / 128.0)); glVertex3f (r_refdef.vieworg[0], r_refdef.vieworg[1], r_refdef.vieworg[2] + domescale[2]); for (b = 1; b < 8; b++) { x = bubble_costable[b * 2 + 16]; y = -bubble_sintable[b * 2 + 16]; v[0] = a1x * x * domescale[0]; v[1] = a1y * x * domescale[1]; v[2] = y * domescale[2]; glTexCoord2f ((v[0] + s) * (1.0 / 128.0), (v[1] + s) * (1.0 / 128.0)); glVertex3f (v[0] + r_refdef.vieworg[0], v[1] + r_refdef.vieworg[1], v[2] + r_refdef.vieworg[2]); v[0] = a2x * x * domescale[0]; v[1] = a2y * x * domescale[1]; v[2] = y * domescale[2]; glTexCoord2f ((v[0] + s) * (1.0 / 128.0), (v[1] + s) * (1.0 / 128.0)); glVertex3f (v[0] + r_refdef.vieworg[0], v[1] + r_refdef.vieworg[1], v[2] + r_refdef.vieworg[2]); } glTexCoord2f (0.5 + s * (1.0 / 128.0), 0.5 + s * (1.0 / 128.0)); glVertex3f (r_refdef.vieworg[0], r_refdef.vieworg[1], r_refdef.vieworg[2] - domescale[2]); glEnd (); } } void R_DrawSkyDome (void) { glEnable (GL_DEPTH_TEST); glDepthFunc (GL_ALWAYS); // glDisable (GL_BLEND); // glTexEnvf (GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA); glDepthRange (gldepthmax, gldepthmax); glDisable (GL_BLEND); if (lighthalf) glColor3f (0.5, 0.5, 0.5); else glColor3f (1, 1, 1); // base sky glBindTexture (GL_TEXTURE_2D, solidskytexture); domescale[0] = 512; domescale[1] = 512; domescale[2] = 128; speedscale = realtime * 8; speedscale -= (int) speedscale & ~127; R_DrawSkyLayer (speedscale); glEnable (GL_BLEND); // clouds if (gl_skymultipass->int_val) { glBindTexture (GL_TEXTURE_2D, alphaskytexture); domescale[0] = 512; domescale[1] = 512; domescale[2] = 128; speedscale = realtime * 16; speedscale -= (int) speedscale & ~127; R_DrawSkyLayer (speedscale); } // glDisable (GL_BLEND); glColor3f (1, 1, 1); glDepthFunc (GL_LEQUAL); glEnable (GL_DEPTH_TEST); glDepthRange (gldepthmin, gldepthmax); } void R_DrawSky (void) { if (skyloaded) R_DrawSkyBox (); else R_DrawSkyDome (); } //=============================================================== /* ============= 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; 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++; glBindTexture (GL_TEXTURE_2D, 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++; glBindTexture (GL_TEXTURE_2D, 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); } /* ============= 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 (); } } /* ================= R_DrawSkyChain ================= */ void R_DrawSkyChain (msurface_t *s) { msurface_t *fa; // used when gl_texsort is on glBindTexture (GL_TEXTURE_2D, solidskytexture); speedscale = realtime * 8; speedscale -= (int) speedscale & ~127; for (fa = s; fa; fa = fa->texturechain) EmitSkyPolys (fa); glEnable (GL_BLEND); glBindTexture (GL_TEXTURE_2D, alphaskytexture); speedscale = realtime * 16; speedscale -= (int) speedscale & ~127; for (fa = s; fa; fa = fa->texturechain) EmitSkyPolys (fa); glDisable (GL_BLEND); } /* =============== 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) { glBindTexture (GL_TEXTURE_2D, solidskytexture); speedscale = realtime * 8; speedscale -= (int) speedscale & ~127; EmitSkyPolys (fa); glEnable (GL_BLEND); glBindTexture (GL_TEXTURE_2D, alphaskytexture); speedscale = realtime * 16; speedscale -= (int) speedscale & ~127; EmitSkyPolys (fa); glDisable (GL_BLEND); }