/* d_edge.c (description) 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 "d_local.h" #include "r_local.h" static int miplevel; float scale_for_mip; extern int screenwidth; int ubasestep, errorterm, erroradjustup, erroradjustdown; int vstartscan; 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 = &r_worldentity; TransformVector (modelorg, transformed_modelorg); VectorCopy (transformed_modelorg, world_transformed_modelorg); // TODO: could preset a lot of this at mode set time if (r_drawflat->int_val) { 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) ((long) 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, r_clearcolor->int_val & 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 = &r_worldentity; 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 // VectorCopy (world_transformed_modelorg, transformed_modelorg); VectorCopy (base_vpn, vpn); VectorCopy (base_vup, vup); VectorCopy (base_vright, vright); VectorCopy (base_modelorg, modelorg); R_TransformFrustum (); currententity = &r_worldentity; } } } } }