a50537262d201be997794cdc1273d400e6691d24
[xonotic/darkplaces.git] / r_sky.c
1
2 #include "quakedef.h"
3 #include "image.h"
4
5 // FIXME: fix skybox after vid_restart
6 cvar_t r_sky = {CVAR_SAVE, "r_sky", "1", "enables sky rendering (black otherwise)"};
7 cvar_t r_skyscroll1 = {CVAR_SAVE, "r_skyscroll1", "1", "speed at which upper clouds layer scrolls in quake sky"};
8 cvar_t r_skyscroll2 = {CVAR_SAVE, "r_skyscroll2", "2", "speed at which lower clouds layer scrolls in quake sky"};
9 int skyrendernow;
10 int skyrendermasked;
11
12 static int skyrendersphere;
13 static int skyrenderbox;
14 static rtexturepool_t *skytexturepool;
15 static char skyname[MAX_QPATH];
16
17 typedef struct suffixinfo_s
18 {
19         char *suffix;
20         qboolean flipx, flipy, flipdiagonal;
21 }
22 suffixinfo_t;
23 static suffixinfo_t suffix[3][6] =
24 {
25         {
26                 {"px",   false, false, false},
27                 {"nx",   false, false, false},
28                 {"py",   false, false, false},
29                 {"ny",   false, false, false},
30                 {"pz",   false, false, false},
31                 {"nz",   false, false, false}
32         },
33         {
34                 {"posx", false, false, false},
35                 {"negx", false, false, false},
36                 {"posy", false, false, false},
37                 {"negy", false, false, false},
38                 {"posz", false, false, false},
39                 {"negz", false, false, false}
40         },
41         {
42                 {"rt",   false, false,  true},
43                 {"lf",    true,  true,  true},
44                 {"bk",   false,  true, false},
45                 {"ft",    true, false, false},
46                 {"up",   false, false,  true},
47                 {"dn",   false, false,  true}
48         }
49 };
50
51 static rtexture_t *skyboxside[6];
52
53 void R_SkyStartFrame(void)
54 {
55         skyrendernow = false;
56         skyrendersphere = false;
57         skyrenderbox = false;
58         skyrendermasked = false;
59         if (r_sky.integer && !fogenabled)
60         {
61                 if (skyboxside[0] || skyboxside[1] || skyboxside[2] || skyboxside[3] || skyboxside[4] || skyboxside[5])
62                         skyrenderbox = true;
63                 else if (r_refdef.worldmodel->brush.solidskytexture)
64                         skyrendersphere = true;
65                 // for depth-masked sky, render the sky on the first sky surface encountered
66                 skyrendernow = true;
67                 skyrendermasked = true;
68         }
69 }
70
71 /*
72 ==================
73 R_SetSkyBox
74 ==================
75 */
76 void R_UnloadSkyBox(void)
77 {
78         int i;
79         for (i = 0;i < 6;i++)
80         {
81                 if (skyboxside[i])
82                         R_FreeTexture(skyboxside[i]);
83                 skyboxside[i] = NULL;
84         }
85 }
86
87 int R_LoadSkyBox(void)
88 {
89         int i, j, success;
90         int indices[4] = {0,1,2,3};
91         char name[MAX_INPUTLINE];
92         unsigned char *image_rgba;
93         unsigned char *temp;
94
95         R_UnloadSkyBox();
96
97         if (!skyname[0])
98                 return true;
99
100         for (j=0; j<3; j++)
101         {
102                 success = 0;
103                 for (i=0; i<6; i++)
104                 {
105                         if (dpsnprintf(name, sizeof(name), "%s_%s", skyname, suffix[j][i].suffix) < 0 || !(image_rgba = loadimagepixels(name, false, 0, 0)))
106                         {
107                                 if (dpsnprintf(name, sizeof(name), "%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_rgba = loadimagepixels(name, false, 0, 0)))
108                                 {
109                                         if (dpsnprintf(name, sizeof(name), "env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_rgba = loadimagepixels(name, false, 0, 0)))
110                                         {
111                                                 if (dpsnprintf(name, sizeof(name), "gfx/env/%s%s", skyname, suffix[j][i].suffix) < 0 || !(image_rgba = loadimagepixels(name, false, 0, 0)))
112                                                         continue;
113                                         }
114                                 }
115                         }
116                         temp = (unsigned char *)Mem_Alloc(tempmempool, image_width*image_height*4);
117                         Image_CopyMux (temp, image_rgba, image_width, image_height, suffix[j][i].flipx, suffix[j][i].flipy, suffix[j][i].flipdiagonal, 4, 4, indices);
118                         skyboxside[i] = R_LoadTexture2D(skytexturepool, va("skyboxside%d", i), image_width, image_height, temp, TEXTYPE_RGBA, TEXF_CLAMP | TEXF_PRECACHE, NULL);
119                         Mem_Free(image_rgba);
120                         Mem_Free(temp);
121                         success++;
122                 }
123
124                 if (success)
125                         break;
126         }
127
128         if (j == 3)
129                 return false;
130
131         return true;
132 }
133
134 int R_SetSkyBox(const char *sky)
135 {
136         if (strcmp(sky, skyname) == 0) // no change
137                 return true;
138
139         if (strlen(sky) > 1000)
140         {
141                 Con_Printf("sky name too long (%i, max is 1000)\n", strlen(sky));
142                 return false;
143         }
144
145         strcpy(skyname, sky);
146
147         return R_LoadSkyBox();
148 }
149
150 // LordHavoc: added LoadSky console command
151 void LoadSky_f (void)
152 {
153         switch (Cmd_Argc())
154         {
155         case 1:
156                 if (skyname[0])
157                         Con_Printf("current sky: %s\n", skyname);
158                 else
159                         Con_Print("no skybox has been set\n");
160                 break;
161         case 2:
162                 if (R_SetSkyBox(Cmd_Argv(1)))
163                 {
164                         if (skyname[0])
165                                 Con_Printf("skybox set to %s\n", skyname);
166                         else
167                                 Con_Print("skybox disabled\n");
168                 }
169                 else
170                         Con_Printf("failed to load skybox %s\n", Cmd_Argv(1));
171                 break;
172         default:
173                 Con_Print("usage: loadsky skyname\n");
174                 break;
175         }
176 }
177
178 float skyboxvertex3f[6*4*3] =
179 {
180         // skyside[0]
181          16, -16,  16,
182          16, -16, -16,
183          16,  16, -16,
184          16,  16,  16,
185         // skyside[1]
186         -16,  16,  16,
187         -16,  16, -16,
188         -16, -16, -16,
189         -16, -16,  16,
190         // skyside[2]
191          16,  16,  16,
192          16,  16, -16,
193         -16,  16, -16,
194         -16,  16,  16,
195         // skyside[3]
196         -16, -16,  16,
197         -16, -16, -16,
198          16, -16, -16,
199          16, -16,  16,
200         // skyside[4]
201         -16, -16,  16,
202          16, -16,  16,
203          16,  16,  16,
204         -16,  16,  16,
205         // skyside[5]
206          16, -16, -16,
207         -16, -16, -16,
208         -16,  16, -16,
209          16,  16, -16
210 };
211
212 float skyboxtexcoord2f[6*4*2] =
213 {
214         // skyside[0]
215         0, 1,
216         1, 1,
217         1, 0,
218         0, 0,
219         // skyside[1]
220         1, 0,
221         0, 0,
222         0, 1,
223         1, 1,
224         // skyside[2]
225         1, 1,
226         1, 0,
227         0, 0,
228         0, 1,
229         // skyside[3]
230         0, 0,
231         0, 1,
232         1, 1,
233         1, 0,
234         // skyside[4]
235         0, 1,
236         1, 1,
237         1, 0,
238         0, 0,
239         // skyside[5]
240         0, 1,
241         1, 1,
242         1, 0,
243         0, 0
244 };
245
246 int skyboxelements[6*2*3] =
247 {
248         // skyside[3]
249          0,  1,  2,
250          0,  2,  3,
251         // skyside[1]
252          4,  5,  6,
253          4,  6,  7,
254         // skyside[0]
255          8,  9, 10,
256          8, 10, 11,
257         // skyside[2]
258         12, 13, 14,
259         12, 14, 15,
260         // skyside[4]
261         16, 17, 18,
262         16, 18, 19,
263         // skyside[5]
264         20, 21, 22,
265         20, 22, 23
266 };
267
268 static void R_SkyBox(void)
269 {
270         int i;
271         GL_Color(1, 1, 1, 1);
272         GL_BlendFunc(GL_ONE, GL_ZERO);
273         GL_DepthMask(false);
274         GL_DepthTest(false); // don't modify or read zbuffer
275         R_Mesh_VertexPointer(skyboxvertex3f);
276         R_Mesh_ColorPointer(NULL);
277         R_Mesh_ResetTextureState();
278         R_Mesh_TexCoordPointer(0, 2, skyboxtexcoord2f);
279         GL_LockArrays(0, 6*4);
280         for (i = 0;i < 6;i++)
281         {
282                 R_Mesh_TexBind(0, R_GetTexture(skyboxside[i]));
283                 R_Mesh_Draw(0, 6*4, 2, skyboxelements + i * 6);
284         }
285         GL_LockArrays(0, 0);
286 }
287
288 #define skygridx 32
289 #define skygridx1 (skygridx + 1)
290 #define skygridxrecip (1.0f / (skygridx))
291 #define skygridy 32
292 #define skygridy1 (skygridy + 1)
293 #define skygridyrecip (1.0f / (skygridy))
294 #define skysphere_numverts (skygridx1 * skygridy1)
295 #define skysphere_numtriangles (skygridx * skygridy * 2)
296 static float skysphere_vertex3f[skysphere_numverts * 3];
297 static float skysphere_texcoord2f[skysphere_numverts * 2];
298 static int skysphere_element3i[skysphere_numtriangles * 3];
299
300 static void skyspherecalc(void)
301 {
302         int i, j, *e;
303         float a, b, x, ax, ay, v[3], length, *vertex3f, *texcoord2f;
304         float dx, dy, dz;
305         dx = 16;
306         dy = 16;
307         dz = 16 / 3;
308         vertex3f = skysphere_vertex3f;
309         texcoord2f = skysphere_texcoord2f;
310         for (j = 0;j <= skygridy;j++)
311         {
312                 a = j * skygridyrecip;
313                 ax = cos(a * M_PI * 2);
314                 ay = -sin(a * M_PI * 2);
315                 for (i = 0;i <= skygridx;i++)
316                 {
317                         b = i * skygridxrecip;
318                         x = cos((b + 0.5) * M_PI);
319                         v[0] = ax*x * dx;
320                         v[1] = ay*x * dy;
321                         v[2] = -sin((b + 0.5) * M_PI) * dz;
322                         length = 3.0f / sqrt(v[0]*v[0]+v[1]*v[1]+(v[2]*v[2]*9));
323                         *texcoord2f++ = v[0] * length;
324                         *texcoord2f++ = v[1] * length;
325                         *vertex3f++ = v[0];
326                         *vertex3f++ = v[1];
327                         *vertex3f++ = v[2];
328                 }
329         }
330         e = skysphere_element3i;
331         for (j = 0;j < skygridy;j++)
332         {
333                 for (i = 0;i < skygridx;i++)
334                 {
335                         *e++ =  j      * skygridx1 + i;
336                         *e++ =  j      * skygridx1 + i + 1;
337                         *e++ = (j + 1) * skygridx1 + i;
338
339                         *e++ =  j      * skygridx1 + i + 1;
340                         *e++ = (j + 1) * skygridx1 + i + 1;
341                         *e++ = (j + 1) * skygridx1 + i;
342                 }
343         }
344 }
345
346 static void R_SkySphere(void)
347 {
348         float speedscale;
349         static qboolean skysphereinitialized = false;
350         matrix4x4_t scroll1matrix, scroll2matrix;
351         if (!skysphereinitialized)
352         {
353                 skysphereinitialized = true;
354                 skyspherecalc();
355         }
356
357         // wrap the scroll values just to be extra kind to float accuracy
358
359         // scroll speed for upper layer
360         speedscale = r_refdef.time*r_skyscroll1.value*8.0/128.0;
361         speedscale -= (int)speedscale;
362         Matrix4x4_CreateTranslate(&scroll1matrix, speedscale, speedscale, 0);
363         // scroll speed for lower layer (transparent layer)
364         speedscale = r_refdef.time*r_skyscroll2.value*8.0/128.0;
365         speedscale -= (int)speedscale;
366         Matrix4x4_CreateTranslate(&scroll2matrix, speedscale, speedscale, 0);
367
368         GL_Color(1, 1, 1, 1);
369         GL_BlendFunc(GL_ONE, GL_ZERO);
370         GL_DepthMask(true);
371         GL_DepthTest(false); // don't modify or read zbuffer
372         R_Mesh_VertexPointer(skysphere_vertex3f);
373         R_Mesh_ColorPointer(NULL);
374         R_Mesh_ResetTextureState();
375         R_Mesh_TexBind(0, R_GetTexture(r_refdef.worldmodel->brush.solidskytexture));
376         R_Mesh_TexCoordPointer(0, 2, skysphere_texcoord2f);
377         R_Mesh_TexMatrix(0, &scroll1matrix);
378         if (r_textureunits.integer >= 2)
379         {
380                 // one pass using GL_DECAL or GL_INTERPOLATE_ARB for alpha layer
381                 R_Mesh_TexBind(1, R_GetTexture(r_refdef.worldmodel->brush.alphaskytexture));
382                 R_Mesh_TexCombine(1, gl_combine.integer ? GL_INTERPOLATE_ARB : GL_DECAL, GL_MODULATE, 1, 1);
383                 R_Mesh_TexCoordPointer(1, 2, skysphere_texcoord2f);
384                 R_Mesh_TexMatrix(1, &scroll2matrix);
385                 GL_LockArrays(0, skysphere_numverts);
386                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
387                 GL_LockArrays(0, 0);
388         }
389         else
390         {
391                 // two pass
392                 GL_LockArrays(0, skysphere_numverts);
393                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
394
395                 GL_BlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
396                 R_Mesh_TexBind(0, R_GetTexture(r_refdef.worldmodel->brush.alphaskytexture));
397                 R_Mesh_TexMatrix(0, &scroll2matrix);
398                 GL_LockArrays(0, skysphere_numverts);
399                 R_Mesh_Draw(0, skysphere_numverts, skysphere_numtriangles, skysphere_element3i);
400                 GL_LockArrays(0, 0);
401         }
402 }
403
404 void R_Sky(void)
405 {
406         matrix4x4_t skymatrix;
407         if (skyrendermasked)
408         {
409                 Matrix4x4_CreateTranslate(&skymatrix, r_vieworigin[0], r_vieworigin[1], r_vieworigin[2]);
410                 R_Mesh_Matrix(&skymatrix);
411                 if (skyrendersphere)
412                 {
413                         // this does not modify depth buffer
414                         R_SkySphere();
415                 }
416                 else if (skyrenderbox)
417                 {
418                         // this does not modify depth buffer
419                         R_SkyBox();
420                 }
421                 /* this will be skyroom someday
422                 else
423                 {
424                         // this modifies the depth buffer so we have to clear it afterward
425                         //R_SkyRoom();
426                         // clear the depthbuffer that was used while rendering the skyroom
427                         //GL_Clear(GL_DEPTH_BUFFER_BIT);
428                 }
429                 */
430                 GL_DepthTest(true);
431                 GL_DepthMask(true);
432         }
433 }
434
435 //===============================================================
436
437 void R_ResetSkyBox(void)
438 {
439         R_UnloadSkyBox();
440         skyname[0] = 0;
441         R_LoadSkyBox();
442 }
443
444 static void r_sky_start(void)
445 {
446         skytexturepool = R_AllocTexturePool();
447         R_LoadSkyBox();
448 }
449
450 static void r_sky_shutdown(void)
451 {
452         R_UnloadSkyBox();
453         R_FreeTexturePool(&skytexturepool);
454 }
455
456 static void r_sky_newmap(void)
457 {
458 }
459
460
461 void R_Sky_Init(void)
462 {
463         Cmd_AddCommand ("loadsky", &LoadSky_f, "load a skybox by basename (for example loadsky mtnsun_ loads mtnsun_ft.tga and so on)");
464         Cvar_RegisterVariable (&r_sky);
465         Cvar_RegisterVariable (&r_skyscroll1);
466         Cvar_RegisterVariable (&r_skyscroll2);
467         memset(&skyboxside, 0, sizeof(skyboxside));
468         skyname[0] = 0;
469         R_RegisterModule("R_Sky", r_sky_start, r_sky_shutdown, r_sky_newmap);
470 }
471