r_lightning.c

   1
   2 #include "quakedef.h"
   3 #include "image.h"
   4
   5 cvar_t r_lightningbeam_thickness = {CVAR_SAVE, "r_lightningbeam_thickness", "4"};
   6 cvar_t r_lightningbeam_scroll = {CVAR_SAVE, "r_lightningbeam_scroll", "5"};
   7 cvar_t r_lightningbeam_repeatdistance = {CVAR_SAVE, "r_lightningbeam_repeatdistance", "128"};
   8 cvar_t r_lightningbeam_color_red = {CVAR_SAVE, "r_lightningbeam_color_red", "1"};
   9 cvar_t r_lightningbeam_color_green = {CVAR_SAVE, "r_lightningbeam_color_green", "1"};
  10 cvar_t r_lightningbeam_color_blue = {CVAR_SAVE, "r_lightningbeam_color_blue", "1"};
  11 cvar_t r_lightningbeam_qmbtexture = {CVAR_SAVE, "r_lightningbeam_qmbtexture", "0"};
  12
  13 rtexture_t *r_lightningbeamtexture;
  14 rtexture_t *r_lightningbeamqmbtexture;
  15 rtexturepool_t *r_lightningbeamtexturepool;
  16
  17 int r_lightningbeamelements[18] = {0, 1, 2, 0, 2, 3, 4, 5, 6, 4, 6, 7, 8, 9, 10, 8, 10, 11};
  18
  19 void r_lightningbeams_start(void)
  20 {
  21         r_lightningbeamtexturepool = R_AllocTexturePool();
  22         r_lightningbeamtexture = NULL;
  23         r_lightningbeamqmbtexture = NULL;
  24 }
  25
  26 void r_lightningbeams_setupqmbtexture(void)
  27 {
  28         r_lightningbeamqmbtexture = loadtextureimage(r_lightningbeamtexturepool, "textures/particles/lightning.pcx", 0, 0, false, TEXF_ALPHA | TEXF_PRECACHE);
  29         if (r_lightningbeamqmbtexture == NULL)
  30                 Cvar_SetValueQuick(&r_lightningbeam_qmbtexture, false);
  31 }
  32
  33 void r_lightningbeams_setuptexture(void)
  34 {
  35 #if 0
  36 #define BEAMWIDTH 128
  37 #define BEAMHEIGHT 64
  38 #define PATHPOINTS 8
  39         int i, j, px, py, nearestpathindex, imagenumber;
  40         float particlex, particley, particlexv, particleyv, dx, dy, s, maxpathstrength;
  41         qbyte *pixels;
  42         int *image;
  43         struct {float x, y, strength;} path[PATHPOINTS], temppath;
  44
  45         image = Mem_Alloc(tempmempool, BEAMWIDTH * BEAMHEIGHT * sizeof(int));
  46         pixels = Mem_Alloc(tempmempool, BEAMWIDTH * BEAMHEIGHT * sizeof(qbyte[4]));
  47
  48         for (imagenumber = 0, maxpathstrength = 0.0339476;maxpathstrength < 0.5;imagenumber++, maxpathstrength += 0.01)
  49         {
  50         for (i = 0;i < PATHPOINTS;i++)
  51         {
  52                 path[i].x = lhrandom(0, 1);
  53                 path[i].y = lhrandom(0.2, 0.8);
  54                 path[i].strength = lhrandom(0, 1);
  55         }
  56         for (i = 0;i < PATHPOINTS;i++)
  57         {
  58                 for (j = i + 1;j < PATHPOINTS;j++)
  59                 {
  60                         if (path[j].x < path[i].x)
  61                         {
  62                                 temppath = path[j];
  63                                 path[j] = path[i];
  64                                 path[i] = temppath;
  65                         }
  66                 }
  67         }
  68         particlex = path[0].x;
  69         particley = path[0].y;
  70         particlexv = lhrandom(0, 0.02);
  71         particlexv = lhrandom(-0.02, 0.02);
  72         memset(image, 0, BEAMWIDTH * BEAMHEIGHT * sizeof(int));
  73         for (i = 0;i < 65536;i++)
  74         {
  75                 for (nearestpathindex = 0;nearestpathindex < PATHPOINTS;nearestpathindex++)
  76                         if (path[nearestpathindex].x > particlex)
  77                                 break;
  78                 nearestpathindex %= PATHPOINTS;
  79                 dx = path[nearestpathindex].x + lhrandom(-0.01, 0.01);dx = bound(0, dx, 1) - particlex;if (dx < 0) dx += 1;
  80                 dy = path[nearestpathindex].y + lhrandom(-0.01, 0.01);dy = bound(0, dy, 1) - particley;
  81                 s = path[nearestpathindex].strength / sqrt(dx*dx+dy*dy);
  82                 particlexv = particlexv /* (1 - lhrandom(0.08, 0.12))*/ + dx * s;
  83                 particleyv = particleyv /* (1 - lhrandom(0.08, 0.12))*/ + dy * s;
  84                 particlex += particlexv * maxpathstrength;particlex -= (int) particlex;
  85                 particley += particleyv * maxpathstrength;particley = bound(0, particley, 1);
  86                 px = particlex * BEAMWIDTH;
  87                 py = particley * BEAMHEIGHT;
  88                 if (px >= 0 && py >= 0 && px < BEAMWIDTH && py < BEAMHEIGHT)
  89                         image[py*BEAMWIDTH+px] += 16;
  90         }
  91
  92         for (py = 0;py < BEAMHEIGHT;py++)
  93         {
  94                 for (px = 0;px < BEAMWIDTH;px++)
  95                 {
  96                         pixels[(py*BEAMWIDTH+px)*4+0] = bound(0, image[py*BEAMWIDTH+px] * 1.0f, 255.0f);
  97                         pixels[(py*BEAMWIDTH+px)*4+1] = bound(0, image[py*BEAMWIDTH+px] * 1.0f, 255.0f);
  98                         pixels[(py*BEAMWIDTH+px)*4+2] = bound(0, image[py*BEAMWIDTH+px] * 1.0f, 255.0f);
  99                         pixels[(py*BEAMWIDTH+px)*4+3] = 255;
 100                 }
 101         }
 102
 103         Image_WriteTGARGBA(va("lightningbeam%i.tga", imagenumber), BEAMWIDTH, BEAMHEIGHT, pixels);
 104         }
 105
 106         r_lightningbeamtexture = R_LoadTexture2D(r_lightningbeamtexturepool, "lightningbeam", BEAMWIDTH, BEAMHEIGHT, pixels, TEXTYPE_RGBA, TEXF_PRECACHE, NULL);
 107
 108         Mem_Free(pixels);
 109         Mem_Free(image);
 110 #else
 111 #define BEAMWIDTH 64
 112 #define BEAMHEIGHT 128
 113         float r, g, b, intensity, fx, width, center;
 114         int x, y;
 115         qbyte *data, *noise1, *noise2;
 116
 117         data = Mem_Alloc(tempmempool, BEAMWIDTH * BEAMHEIGHT * 4);
 118         noise1 = Mem_Alloc(tempmempool, BEAMHEIGHT * BEAMHEIGHT);
 119         noise2 = Mem_Alloc(tempmempool, BEAMHEIGHT * BEAMHEIGHT);
 120         fractalnoise(noise1, BEAMHEIGHT, BEAMHEIGHT / 8);
 121         fractalnoise(noise2, BEAMHEIGHT, BEAMHEIGHT / 16);
 122
 123         for (y = 0;y < BEAMHEIGHT;y++)
 124         {
 125                 width = 0.15;//((noise1[y * BEAMHEIGHT] * (1.0f / 256.0f)) * 0.1f + 0.1f);
 126                 center = (noise1[y * BEAMHEIGHT + (BEAMHEIGHT / 2)] / 256.0f) * (1.0f - width * 2.0f) + width;
 127                 for (x = 0;x < BEAMWIDTH;x++, fx++)
 128                 {
 129                         fx = (((float) x / BEAMWIDTH) - center) / width;
 130                         intensity = 1.0f - sqrt(fx * fx);
 131                         if (intensity > 0)
 132                                 intensity = pow(intensity, 2) * ((noise2[y * BEAMHEIGHT + x] * (1.0f / 256.0f)) * 0.33f + 0.66f);
 133                         intensity = bound(0, intensity, 1);
 134                         r = intensity * 1.0f;
 135                         g = intensity * 1.0f;
 136                         b = intensity * 1.0f;
 137                         data[(y * BEAMWIDTH + x) * 4 + 0] = (qbyte)(bound(0, r, 1) * 255.0f);
 138                         data[(y * BEAMWIDTH + x) * 4 + 1] = (qbyte)(bound(0, g, 1) * 255.0f);
 139                         data[(y * BEAMWIDTH + x) * 4 + 2] = (qbyte)(bound(0, b, 1) * 255.0f);
 140                         data[(y * BEAMWIDTH + x) * 4 + 3] = (qbyte)255;
 141                 }
 142         }
 143
 144         r_lightningbeamtexture = R_LoadTexture2D(r_lightningbeamtexturepool, "lightningbeam", BEAMWIDTH, BEAMHEIGHT, data, TEXTYPE_RGBA, TEXF_PRECACHE, NULL);
 145         Mem_Free(noise1);
 146         Mem_Free(noise2);
 147         Mem_Free(data);
 148 #endif
 149 }
 150
 151 void r_lightningbeams_shutdown(void)
 152 {
 153         r_lightningbeamtexture = NULL;
 154         r_lightningbeamqmbtexture = NULL;
 155         R_FreeTexturePool(&r_lightningbeamtexturepool);
 156 }
 157
 158 void r_lightningbeams_newmap(void)
 159 {
 160 }
 161
 162 void R_LightningBeams_Init(void)
 163 {
 164         Cvar_RegisterVariable(&r_lightningbeam_thickness);
 165         Cvar_RegisterVariable(&r_lightningbeam_scroll);
 166         Cvar_RegisterVariable(&r_lightningbeam_repeatdistance);
 167         Cvar_RegisterVariable(&r_lightningbeam_color_red);
 168         Cvar_RegisterVariable(&r_lightningbeam_color_green);
 169         Cvar_RegisterVariable(&r_lightningbeam_color_blue);
 170         Cvar_RegisterVariable(&r_lightningbeam_qmbtexture);
 171         R_RegisterModule("R_LightningBeams", r_lightningbeams_start, r_lightningbeams_shutdown, r_lightningbeams_newmap);
 172 }
 173
 174 void R_CalcLightningBeamPolygonVertex3f(float *v, const float *start, const float *end, const float *offset)
 175 {
 176         // near right corner
 177         VectorAdd     (start, offset, (v + 0));
 178         // near left corner
 179         VectorSubtract(start, offset, (v + 3));
 180         // far left corner
 181         VectorSubtract(end  , offset, (v + 6));
 182         // far right corner
 183         VectorAdd     (end  , offset, (v + 9));
 184 }
 185
 186 void R_CalcLightningBeamPolygonTexCoord2f(float *tc, float t1, float t2)
 187 {
 188         if (r_lightningbeam_qmbtexture.integer)
 189         {
 190                 // near right corner
 191                 tc[0] = t1;tc[1] = 0;
 192                 // near left corner
 193                 tc[2] = t1;tc[3] = 1;
 194                 // far left corner
 195                 tc[4] = t2;tc[5] = 1;
 196                 // far right corner
 197                 tc[6] = t2;tc[7] = 0;
 198         }
 199         else
 200         {
 201                 // near right corner
 202                 tc[0] = 0;tc[1] = t1;
 203                 // near left corner
 204                 tc[2] = 1;tc[3] = t1;
 205                 // far left corner
 206                 tc[4] = 1;tc[5] = t2;
 207                 // far right corner
 208                 tc[6] = 0;tc[7] = t2;
 209         }
 210 }
 211
 212 void R_FogLightningBeam_Vertex3f_Color4f(const float *v, float *c, int numverts, float r, float g, float b, float a)
 213 {
 214         int i;
 215         vec3_t fogvec;
 216         float ifog;
 217         for (i = 0;i < numverts;i++, v += 3, c += 4)
 218         {
 219                 VectorSubtract(v, r_vieworigin, fogvec);
 220                 ifog = 1 - exp(fogdensity/DotProduct(fogvec,fogvec));
 221                 c[0] = r * ifog;
 222                 c[1] = g * ifog;
 223                 c[2] = b * ifog;
 224                 c[3] = a;
 225         }
 226 }
 227
 228 float beamrepeatscale;
 229
 230 void R_DrawLightningBeamCallback(const void *calldata1, int calldata2)
 231 {
 232         const beam_t *b = calldata1;
 233         rmeshstate_t m;
 234         vec3_t beamdir, right, up, offset;
 235         float length, t1, t2;
 236
 237         R_Mesh_Matrix(&r_identitymatrix);
 238
 239         // calculate beam direction (beamdir) vector and beam length
 240         // get difference vector
 241         VectorSubtract(b->end, b->start, beamdir);
 242         // find length of difference vector
 243         length = sqrt(DotProduct(beamdir, beamdir));
 244         // calculate scale to make beamdir a unit vector (normalized)
 245         t1 = 1.0f / length;
 246         // scale beamdir so it is now normalized
 247         VectorScale(beamdir, t1, beamdir);
 248
 249         // calculate up vector such that it points toward viewer, and rotates around the beamdir
 250         // get direction from start of beam to viewer
 251         VectorSubtract(r_vieworigin, b->start, up);
 252         // remove the portion of the vector that moves along the beam
 253         // (this leaves only a vector pointing directly away from the beam)
 254         t1 = -DotProduct(up, beamdir);
 255         VectorMA(up, t1, beamdir, up);
 256         // generate right vector from forward and up, the result is unnormalized
 257         CrossProduct(beamdir, up, right);
 258         // now normalize the right vector and up vector
 259         VectorNormalize(right);
 260         VectorNormalize(up);
 261
 262         // calculate T coordinate scrolling (start and end texcoord along the beam)
 263         t1 = r_refdef.time * -r_lightningbeam_scroll.value;// + beamrepeatscale * DotProduct(b->start, beamdir);
 264         t1 = t1 - (int) t1;
 265         t2 = t1 + beamrepeatscale * length;
 266
 267         // the beam is 3 polygons in this configuration:
 268         //  *   2
 269         //   * *
 270         // 1******
 271         //   * *
 272         //  *   3
 273         // they are showing different portions of the beam texture, creating an
 274         // illusion of a beam that appears to curl around in 3D space
 275         // (and realize that the whole polygon assembly orients itself to face
 276         //  the viewer)
 277
 278         memset(&m, 0, sizeof(m));
 279         if (r_lightningbeam_qmbtexture.integer)
 280                 m.tex[0] = R_GetTexture(r_lightningbeamqmbtexture);
 281         else
 282                 m.tex[0] = R_GetTexture(r_lightningbeamtexture);
 283         m.pointer_texcoord[0] = varray_texcoord2f[0];
 284         m.pointer_vertex = varray_vertex3f;
 285
 286         GL_BlendFunc(GL_SRC_ALPHA, GL_ONE);
 287         GL_DepthMask(false);
 288         GL_DepthTest(true);
 289         if (r_lightningbeam_qmbtexture.integer && r_lightningbeamqmbtexture == NULL)
 290                 r_lightningbeams_setupqmbtexture();
 291         if (!r_lightningbeam_qmbtexture.integer && r_lightningbeamtexture == NULL)
 292                 r_lightningbeams_setuptexture();
 293
 294         // polygon 1, verts 0-3
 295         VectorScale(right, r_lightningbeam_thickness.value, offset);
 296         R_CalcLightningBeamPolygonVertex3f(varray_vertex3f + 0, b->start, b->end, offset);
 297         // polygon 2, verts 4-7
 298         VectorAdd(right, up, offset);
 299         VectorScale(offset, r_lightningbeam_thickness.value * 0.70710681f, offset);
 300         R_CalcLightningBeamPolygonVertex3f(varray_vertex3f + 12, b->start, b->end, offset);
 301         // polygon 3, verts 8-11
 302         VectorSubtract(right, up, offset);
 303         VectorScale(offset, r_lightningbeam_thickness.value * 0.70710681f, offset);
 304         R_CalcLightningBeamPolygonVertex3f(varray_vertex3f + 24, b->start, b->end, offset);
 305         R_CalcLightningBeamPolygonTexCoord2f(varray_texcoord2f[0] + 0, t1, t2);
 306         R_CalcLightningBeamPolygonTexCoord2f(varray_texcoord2f[0] + 8, t1 + 0.33, t2 + 0.33);
 307         R_CalcLightningBeamPolygonTexCoord2f(varray_texcoord2f[0] + 16, t1 + 0.66, t2 + 0.66);
 308
 309         if (fogenabled)
 310         {
 311                 // per vertex colors if fog is used
 312                 m.pointer_color = varray_color4f;
 313                 R_FogLightningBeam_Vertex3f_Color4f(varray_vertex3f, varray_color4f, 12, r_lightningbeam_color_red.value, r_lightningbeam_color_green.value, r_lightningbeam_color_blue.value, 1);
 314         }
 315         else
 316         {
 317                 // solid color if fog is not used
 318                 GL_Color(r_lightningbeam_color_red.value, r_lightningbeam_color_green.value, r_lightningbeam_color_blue.value, 1);
 319         }
 320         R_Mesh_State(&m);
 321
 322         // draw the 3 polygons as one batch of 6 triangles using the 12 vertices
 323         GL_LockArrays(0, 12);
 324         R_Mesh_Draw(12, 6, r_lightningbeamelements);
 325         GL_LockArrays(0, 0);
 326 }
 327
 328 void R_DrawLightningBeams(void)
 329 {
 330         int i;
 331         beam_t *b;
 332         vec3_t org;
 333
 334         if (!cl_beams_polygons.integer)
 335                 return;
 336
 337         beamrepeatscale = 1.0f / r_lightningbeam_repeatdistance.value;
 338         for (i = 0, b = cl_beams;i < cl_max_beams;i++, b++)
 339         {
 340                 if (b->model && b->endtime >= r_refdef.time && b->lightning)
 341                 {
 342                         VectorAdd(b->start, b->end, org);
 343                         VectorScale(org, 0.5f, org);
 344                         R_MeshQueue_AddTransparent(org, R_DrawLightningBeamCallback, b, 0);
 345                 }
 346         }
 347 }
 348