diff options
Diffstat (limited to 'WinQuake/d_edge.c')
| -rw-r--r-- | WinQuake/d_edge.c | 331 |
1 files changed, 331 insertions, 0 deletions
diff --git a/WinQuake/d_edge.c b/WinQuake/d_edge.c new file mode 100644 index 0000000..52cc8eb --- /dev/null +++ b/WinQuake/d_edge.c @@ -0,0 +1,331 @@ +/* +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 the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + +*/ +// d_edge.c + +#include "quakedef.h" +#include "d_local.h" + +static int miplevel; + +float scale_for_mip; +int screenwidth; +int ubasestep, errorterm, erroradjustup, erroradjustdown; +int vstartscan; + +// FIXME: should go away +extern void R_RotateBmodel (void); +extern void R_TransformFrustum (void); + +vec3_t transformed_modelorg; + +/* +============== +D_DrawPoly + +============== +*/ +void D_DrawPoly (void) +{ +// this driver takes spans, not polygons +} + + +/* +============= +D_MipLevelForScale +============= +*/ +int D_MipLevelForScale (float scale) +{ + int lmiplevel; + + if (scale >= d_scalemip[0] ) + lmiplevel = 0; + else if (scale >= d_scalemip[1] ) + lmiplevel = 1; + else if (scale >= d_scalemip[2] ) + lmiplevel = 2; + else + lmiplevel = 3; + + if (lmiplevel < d_minmip) + lmiplevel = d_minmip; + + return lmiplevel; +} + + +/* +============== +D_DrawSolidSurface +============== +*/ + +// FIXME: clean this up + +void D_DrawSolidSurface (surf_t *surf, int color) +{ + espan_t *span; + byte *pdest; + int u, u2, pix; + + pix = (color<<24) | (color<<16) | (color<<8) | color; + for (span=surf->spans ; span ; span=span->pnext) + { + pdest = (byte *)d_viewbuffer + screenwidth*span->v; + u = span->u; + u2 = span->u + span->count - 1; + ((byte *)pdest)[u] = pix; + + if (u2 - u < 8) + { + for (u++ ; u <= u2 ; u++) + ((byte *)pdest)[u] = pix; + } + else + { + for (u++ ; u & 3 ; u++) + ((byte *)pdest)[u] = pix; + + u2 -= 4; + for ( ; u <= u2 ; u+=4) + *(int *)((byte *)pdest + u) = pix; + u2 += 4; + for ( ; u <= u2 ; u++) + ((byte *)pdest)[u] = pix; + } + } +} + + +/* +============== +D_CalcGradients +============== +*/ +void D_CalcGradients (msurface_t *pface) +{ + mplane_t *pplane; + float mipscale; + vec3_t p_temp1; + vec3_t p_saxis, p_taxis; + float t; + + pplane = pface->plane; + + mipscale = 1.0 / (float)(1 << miplevel); + + TransformVector (pface->texinfo->vecs[0], p_saxis); + TransformVector (pface->texinfo->vecs[1], p_taxis); + + t = xscaleinv * mipscale; + d_sdivzstepu = p_saxis[0] * t; + d_tdivzstepu = p_taxis[0] * t; + + t = yscaleinv * mipscale; + d_sdivzstepv = -p_saxis[1] * t; + d_tdivzstepv = -p_taxis[1] * t; + + d_sdivzorigin = p_saxis[2] * mipscale - xcenter * d_sdivzstepu - + ycenter * d_sdivzstepv; + d_tdivzorigin = p_taxis[2] * mipscale - xcenter * d_tdivzstepu - + ycenter * d_tdivzstepv; + + VectorScale (transformed_modelorg, mipscale, p_temp1); + + t = 0x10000*mipscale; + sadjust = ((fixed16_t)(DotProduct (p_temp1, p_saxis) * 0x10000 + 0.5)) - + ((pface->texturemins[0] << 16) >> miplevel) + + pface->texinfo->vecs[0][3]*t; + tadjust = ((fixed16_t)(DotProduct (p_temp1, p_taxis) * 0x10000 + 0.5)) - + ((pface->texturemins[1] << 16) >> miplevel) + + pface->texinfo->vecs[1][3]*t; + +// +// -1 (-epsilon) so we never wander off the edge of the texture +// + bbextents = ((pface->extents[0] << 16) >> miplevel) - 1; + bbextentt = ((pface->extents[1] << 16) >> miplevel) - 1; +} + + +/* +============== +D_DrawSurfaces +============== +*/ +void D_DrawSurfaces (void) +{ + surf_t *s; + msurface_t *pface; + surfcache_t *pcurrentcache; + vec3_t world_transformed_modelorg; + vec3_t local_modelorg; + + currententity = &cl_entities[0]; + TransformVector (modelorg, transformed_modelorg); + VectorCopy (transformed_modelorg, world_transformed_modelorg); + +// TODO: could preset a lot of this at mode set time + if (r_drawflat.value) + { + for (s = &surfaces[1] ; s<surface_p ; s++) + { + if (!s->spans) + continue; + + d_zistepu = s->d_zistepu; + d_zistepv = s->d_zistepv; + d_ziorigin = s->d_ziorigin; + + D_DrawSolidSurface (s, (int)s->data & 0xFF); + D_DrawZSpans (s->spans); + } + } + else + { + for (s = &surfaces[1] ; s<surface_p ; s++) + { + if (!s->spans) + continue; + + r_drawnpolycount++; + + d_zistepu = s->d_zistepu; + d_zistepv = s->d_zistepv; + d_ziorigin = s->d_ziorigin; + + if (s->flags & SURF_DRAWSKY) + { + if (!r_skymade) + { + R_MakeSky (); + } + + D_DrawSkyScans8 (s->spans); + D_DrawZSpans (s->spans); + } + else if (s->flags & SURF_DRAWBACKGROUND) + { + // set up a gradient for the background surface that places it + // effectively at infinity distance from the viewpoint + d_zistepu = 0; + d_zistepv = 0; + d_ziorigin = -0.9; + + D_DrawSolidSurface (s, (int)r_clearcolor.value & 0xFF); + D_DrawZSpans (s->spans); + } + else if (s->flags & SURF_DRAWTURB) + { + pface = s->data; + miplevel = 0; + cacheblock = (pixel_t *) + ((byte *)pface->texinfo->texture + + pface->texinfo->texture->offsets[0]); + cachewidth = 64; + + if (s->insubmodel) + { + // FIXME: we don't want to do all this for every polygon! + // TODO: store once at start of frame + currententity = s->entity; //FIXME: make this passed in to + // R_RotateBmodel () + VectorSubtract (r_origin, currententity->origin, + local_modelorg); + TransformVector (local_modelorg, transformed_modelorg); + + R_RotateBmodel (); // FIXME: don't mess with the frustum, + // make entity passed in + } + + D_CalcGradients (pface); + Turbulent8 (s->spans); + D_DrawZSpans (s->spans); + + if (s->insubmodel) + { + // + // restore the old drawing state + // FIXME: we don't want to do this every time! + // TODO: speed up + // + currententity = &cl_entities[0]; + VectorCopy (world_transformed_modelorg, + transformed_modelorg); + VectorCopy (base_vpn, vpn); + VectorCopy (base_vup, vup); + VectorCopy (base_vright, vright); + VectorCopy (base_modelorg, modelorg); + R_TransformFrustum (); + } + } + else + { + if (s->insubmodel) + { + // FIXME: we don't want to do all this for every polygon! + // TODO: store once at start of frame + currententity = s->entity; //FIXME: make this passed in to + // R_RotateBmodel () + VectorSubtract (r_origin, currententity->origin, local_modelorg); + TransformVector (local_modelorg, transformed_modelorg); + + R_RotateBmodel (); // FIXME: don't mess with the frustum, + // make entity passed in + } + + pface = s->data; + miplevel = D_MipLevelForScale (s->nearzi * scale_for_mip + * pface->texinfo->mipadjust); + + // FIXME: make this passed in to D_CacheSurface + pcurrentcache = D_CacheSurface (pface, miplevel); + + cacheblock = (pixel_t *)pcurrentcache->data; + cachewidth = pcurrentcache->width; + + D_CalcGradients (pface); + + (*d_drawspans) (s->spans); + + D_DrawZSpans (s->spans); + + if (s->insubmodel) + { + // + // restore the old drawing state + // FIXME: we don't want to do this every time! + // TODO: speed up + // + currententity = &cl_entities[0]; + VectorCopy (world_transformed_modelorg, + transformed_modelorg); + VectorCopy (base_vpn, vpn); + VectorCopy (base_vup, vup); + VectorCopy (base_vright, vright); + VectorCopy (base_modelorg, modelorg); + R_TransformFrustum (); + } + } + } + } +} + |