/* gl_sky.c sky 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 "console.h" #include "glquake.h" #include "tga.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; /* R_LoadSkys */ char *suf[6] = { "rt", "bk", "lf", "ft", "up", "dn" }; void R_LoadSkys (char *skyname) { int i; QFile *f; char name[64]; if (stricmp (skyname, "none") == 0) { skyloaded = false; return; } skyloaded = true; for (i = 0; i < 6; i++) { byte *targa_rgba; 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; } targa_rgba = 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 +y {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 -x {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 -y {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 +x {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 +z {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 -z {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; glDisable (GL_DEPTH_TEST); glDepthRange (gldepthmax, gldepthmax); 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 (); } 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) { glDisable (GL_DEPTH_TEST); glDepthRange (gldepthmax, gldepthmax); glDisable (GL_BLEND); // 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); } 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 int trans[128 * 128]; unsigned int transpix; int r, g, b; unsigned int *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); }