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1.1 ! root 1: // r_aclip.c: clip routines for drawing Alias models directly to the screen ! 2: ! 3: #include "quakedef.h" ! 4: #include "r_local.h" ! 5: #include "d_local.h" ! 6: ! 7: static finalvert_t fv[2][8]; ! 8: static auxvert_t av[8]; ! 9: ! 10: void R_AliasProjectFinalVert (finalvert_t *fv, auxvert_t *av); ! 11: void R_Alias_clip_top (finalvert_t *pfv0, finalvert_t *pfv1, ! 12: finalvert_t *out); ! 13: void R_Alias_clip_bottom (finalvert_t *pfv0, finalvert_t *pfv1, ! 14: finalvert_t *out); ! 15: void R_Alias_clip_left (finalvert_t *pfv0, finalvert_t *pfv1, ! 16: finalvert_t *out); ! 17: void R_Alias_clip_right (finalvert_t *pfv0, finalvert_t *pfv1, ! 18: finalvert_t *out); ! 19: ! 20: ! 21: /* ! 22: ================ ! 23: R_Alias_clip_z ! 24: ! 25: pfv0 is the unclipped vertex, pfv1 is the z-clipped vertex ! 26: ================ ! 27: */ ! 28: void R_Alias_clip_z (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out) ! 29: { ! 30: float scale; ! 31: auxvert_t *pav0, *pav1, avout; ! 32: ! 33: pav0 = &av[pfv0 - &fv[0][0]]; ! 34: pav1 = &av[pfv1 - &fv[0][0]]; ! 35: ! 36: if (pfv0->v[1] >= pfv1->v[1]) ! 37: { ! 38: scale = (ALIAS_Z_CLIP_PLANE - pav0->fv[2]) / ! 39: (pav1->fv[2] - pav0->fv[2]); ! 40: ! 41: avout.fv[0] = pav0->fv[0] + (pav1->fv[0] - pav0->fv[0]) * scale; ! 42: avout.fv[1] = pav0->fv[1] + (pav1->fv[1] - pav0->fv[1]) * scale; ! 43: avout.fv[2] = ALIAS_Z_CLIP_PLANE; ! 44: ! 45: out->v[2] = pfv0->v[2] + (pfv1->v[2] - pfv0->v[2]) * scale; ! 46: out->v[3] = pfv0->v[3] + (pfv1->v[3] - pfv0->v[3]) * scale; ! 47: out->v[4] = pfv0->v[4] + (pfv1->v[4] - pfv0->v[4]) * scale; ! 48: } ! 49: else ! 50: { ! 51: scale = (ALIAS_Z_CLIP_PLANE - pav1->fv[2]) / ! 52: (pav0->fv[2] - pav1->fv[2]); ! 53: ! 54: avout.fv[0] = pav1->fv[0] + (pav0->fv[0] - pav1->fv[0]) * scale; ! 55: avout.fv[1] = pav1->fv[1] + (pav0->fv[1] - pav1->fv[1]) * scale; ! 56: avout.fv[2] = ALIAS_Z_CLIP_PLANE; ! 57: ! 58: out->v[2] = pfv1->v[2] + (pfv0->v[2] - pfv1->v[2]) * scale; ! 59: out->v[3] = pfv1->v[3] + (pfv0->v[3] - pfv1->v[3]) * scale; ! 60: out->v[4] = pfv1->v[4] + (pfv0->v[4] - pfv1->v[4]) * scale; ! 61: } ! 62: ! 63: R_AliasProjectFinalVert (out, &avout); ! 64: ! 65: if (out->v[0] < r_refdef.aliasvrect.x) ! 66: out->flags |= ALIAS_LEFT_CLIP; ! 67: if (out->v[1] < r_refdef.aliasvrect.y) ! 68: out->flags |= ALIAS_TOP_CLIP; ! 69: if (out->v[0] > r_refdef.aliasvrectright) ! 70: out->flags |= ALIAS_RIGHT_CLIP; ! 71: if (out->v[1] > r_refdef.aliasvrectbottom) ! 72: out->flags |= ALIAS_BOTTOM_CLIP; ! 73: } ! 74: ! 75: ! 76: #if !id386 ! 77: ! 78: void R_Alias_clip_left (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out) ! 79: { ! 80: float scale; ! 81: int i; ! 82: ! 83: if (pfv0->v[1] >= pfv1->v[1]) ! 84: { ! 85: scale = (float)(r_refdef.aliasvrect.x - pfv0->v[0]) / ! 86: (pfv1->v[0] - pfv0->v[0]); ! 87: for (i=0 ; i<6 ; i++) ! 88: out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i])*scale + 0.5; ! 89: } ! 90: else ! 91: { ! 92: scale = (float)(r_refdef.aliasvrect.x - pfv1->v[0]) / ! 93: (pfv0->v[0] - pfv1->v[0]); ! 94: for (i=0 ; i<6 ; i++) ! 95: out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i])*scale + 0.5; ! 96: } ! 97: } ! 98: ! 99: ! 100: void R_Alias_clip_right (finalvert_t *pfv0, finalvert_t *pfv1, ! 101: finalvert_t *out) ! 102: { ! 103: float scale; ! 104: int i; ! 105: ! 106: if (pfv0->v[1] >= pfv1->v[1]) ! 107: { ! 108: scale = (float)(r_refdef.aliasvrectright - pfv0->v[0]) / ! 109: (pfv1->v[0] - pfv0->v[0]); ! 110: for (i=0 ; i<6 ; i++) ! 111: out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i])*scale + 0.5; ! 112: } ! 113: else ! 114: { ! 115: scale = (float)(r_refdef.aliasvrectright - pfv1->v[0]) / ! 116: (pfv0->v[0] - pfv1->v[0]); ! 117: for (i=0 ; i<6 ; i++) ! 118: out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i])*scale + 0.5; ! 119: } ! 120: } ! 121: ! 122: ! 123: void R_Alias_clip_top (finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out) ! 124: { ! 125: float scale; ! 126: int i; ! 127: ! 128: if (pfv0->v[1] >= pfv1->v[1]) ! 129: { ! 130: scale = (float)(r_refdef.aliasvrect.y - pfv0->v[1]) / ! 131: (pfv1->v[1] - pfv0->v[1]); ! 132: for (i=0 ; i<6 ; i++) ! 133: out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i])*scale + 0.5; ! 134: } ! 135: else ! 136: { ! 137: scale = (float)(r_refdef.aliasvrect.y - pfv1->v[1]) / ! 138: (pfv0->v[1] - pfv1->v[1]); ! 139: for (i=0 ; i<6 ; i++) ! 140: out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i])*scale + 0.5; ! 141: } ! 142: } ! 143: ! 144: ! 145: void R_Alias_clip_bottom (finalvert_t *pfv0, finalvert_t *pfv1, ! 146: finalvert_t *out) ! 147: { ! 148: float scale; ! 149: int i; ! 150: ! 151: if (pfv0->v[1] >= pfv1->v[1]) ! 152: { ! 153: scale = (float)(r_refdef.aliasvrectbottom - pfv0->v[1]) / ! 154: (pfv1->v[1] - pfv0->v[1]); ! 155: ! 156: for (i=0 ; i<6 ; i++) ! 157: out->v[i] = pfv0->v[i] + (pfv1->v[i] - pfv0->v[i])*scale + 0.5; ! 158: } ! 159: else ! 160: { ! 161: scale = (float)(r_refdef.aliasvrectbottom - pfv1->v[1]) / ! 162: (pfv0->v[1] - pfv1->v[1]); ! 163: ! 164: for (i=0 ; i<6 ; i++) ! 165: out->v[i] = pfv1->v[i] + (pfv0->v[i] - pfv1->v[i])*scale + 0.5; ! 166: } ! 167: } ! 168: ! 169: #endif ! 170: ! 171: ! 172: int R_AliasClip (finalvert_t *in, finalvert_t *out, int flag, int count, ! 173: void(*clip)(finalvert_t *pfv0, finalvert_t *pfv1, finalvert_t *out) ) ! 174: { ! 175: int i,j,k; ! 176: int flags, oldflags; ! 177: ! 178: j = count-1; ! 179: k = 0; ! 180: for (i=0 ; i<count ; j = i, i++) ! 181: { ! 182: oldflags = in[j].flags & flag; ! 183: flags = in[i].flags & flag; ! 184: ! 185: if (flags && oldflags) ! 186: continue; ! 187: if (oldflags ^ flags) ! 188: { ! 189: clip (&in[j], &in[i], &out[k]); ! 190: out[k].flags = 0; ! 191: if (out[k].v[0] < r_refdef.aliasvrect.x) ! 192: out[k].flags |= ALIAS_LEFT_CLIP; ! 193: if (out[k].v[1] < r_refdef.aliasvrect.y) ! 194: out[k].flags |= ALIAS_TOP_CLIP; ! 195: if (out[k].v[0] > r_refdef.aliasvrectright) ! 196: out[k].flags |= ALIAS_RIGHT_CLIP; ! 197: if (out[k].v[1] > r_refdef.aliasvrectbottom) ! 198: out[k].flags |= ALIAS_BOTTOM_CLIP; ! 199: k++; ! 200: } ! 201: if (!flags) ! 202: { ! 203: out[k] = in[i]; ! 204: k++; ! 205: } ! 206: } ! 207: ! 208: return k; ! 209: } ! 210: ! 211: ! 212: /* ! 213: ================ ! 214: R_AliasClipTriangle ! 215: ================ ! 216: */ ! 217: void R_AliasClipTriangle (mtriangle_t *ptri) ! 218: { ! 219: int i, k, pingpong; ! 220: mtriangle_t mtri; ! 221: unsigned clipflags; ! 222: ! 223: // copy vertexes and fix seam texture coordinates ! 224: if (ptri->facesfront) ! 225: { ! 226: fv[0][0] = pfinalverts[ptri->vertindex[0]]; ! 227: fv[0][1] = pfinalverts[ptri->vertindex[1]]; ! 228: fv[0][2] = pfinalverts[ptri->vertindex[2]]; ! 229: } ! 230: else ! 231: { ! 232: for (i=0 ; i<3 ; i++) ! 233: { ! 234: fv[0][i] = pfinalverts[ptri->vertindex[i]]; ! 235: ! 236: if (!ptri->facesfront && (fv[0][i].flags & ALIAS_ONSEAM) ) ! 237: fv[0][i].v[2] += r_affinetridesc.seamfixupX16; ! 238: } ! 239: } ! 240: ! 241: // clip ! 242: clipflags = fv[0][0].flags | fv[0][1].flags | fv[0][2].flags; ! 243: ! 244: if (clipflags & ALIAS_Z_CLIP) ! 245: { ! 246: for (i=0 ; i<3 ; i++) ! 247: av[i] = pauxverts[ptri->vertindex[i]]; ! 248: ! 249: k = R_AliasClip (fv[0], fv[1], ALIAS_Z_CLIP, 3, R_Alias_clip_z); ! 250: if (k == 0) ! 251: return; ! 252: ! 253: pingpong = 1; ! 254: clipflags = fv[1][0].flags | fv[1][1].flags | fv[1][2].flags; ! 255: } ! 256: else ! 257: { ! 258: pingpong = 0; ! 259: k = 3; ! 260: } ! 261: ! 262: if (clipflags & ALIAS_LEFT_CLIP) ! 263: { ! 264: k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1], ! 265: ALIAS_LEFT_CLIP, k, R_Alias_clip_left); ! 266: if (k == 0) ! 267: return; ! 268: ! 269: pingpong ^= 1; ! 270: } ! 271: ! 272: if (clipflags & ALIAS_RIGHT_CLIP) ! 273: { ! 274: k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1], ! 275: ALIAS_RIGHT_CLIP, k, R_Alias_clip_right); ! 276: if (k == 0) ! 277: return; ! 278: ! 279: pingpong ^= 1; ! 280: } ! 281: ! 282: if (clipflags & ALIAS_BOTTOM_CLIP) ! 283: { ! 284: k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1], ! 285: ALIAS_BOTTOM_CLIP, k, R_Alias_clip_bottom); ! 286: if (k == 0) ! 287: return; ! 288: ! 289: pingpong ^= 1; ! 290: } ! 291: ! 292: if (clipflags & ALIAS_TOP_CLIP) ! 293: { ! 294: k = R_AliasClip (fv[pingpong], fv[pingpong ^ 1], ! 295: ALIAS_TOP_CLIP, k, R_Alias_clip_top); ! 296: if (k == 0) ! 297: return; ! 298: ! 299: pingpong ^= 1; ! 300: } ! 301: ! 302: for (i=0 ; i<k ; i++) ! 303: { ! 304: if (fv[pingpong][i].v[0] < r_refdef.aliasvrect.x) ! 305: fv[pingpong][i].v[0] = r_refdef.aliasvrect.x; ! 306: else if (fv[pingpong][i].v[0] > r_refdef.aliasvrectright) ! 307: fv[pingpong][i].v[0] = r_refdef.aliasvrectright; ! 308: ! 309: if (fv[pingpong][i].v[1] < r_refdef.aliasvrect.y) ! 310: fv[pingpong][i].v[1] = r_refdef.aliasvrect.y; ! 311: else if (fv[pingpong][i].v[1] > r_refdef.aliasvrectbottom) ! 312: fv[pingpong][i].v[1] = r_refdef.aliasvrectbottom; ! 313: ! 314: fv[pingpong][i].flags = 0; ! 315: } ! 316: ! 317: // draw triangles ! 318: mtri.facesfront = ptri->facesfront; ! 319: r_affinetridesc.ptriangles = &mtri; ! 320: r_affinetridesc.pfinalverts = fv[pingpong]; ! 321: ! 322: // FIXME: do all at once as trifan? ! 323: mtri.vertindex[0] = 0; ! 324: for (i=1 ; i<k-1 ; i++) ! 325: { ! 326: mtri.vertindex[1] = i; ! 327: mtri.vertindex[2] = i+1; ! 328: D_PolysetDraw (); ! 329: } ! 330: } ! 331:
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