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585 lines
13 KiB
C
585 lines
13 KiB
C
// SONIC ROBO BLAST 2
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//-----------------------------------------------------------------------------
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// Copyright (C) 1998-2000 by DooM Legacy Team.
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// Copyright (C) 1999-2023 by Sonic Team Junior.
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//
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// This program is free software distributed under the
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// terms of the GNU General Public License, version 2.
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// See the 'LICENSE' file for more details.
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//-----------------------------------------------------------------------------
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/// \file r_splats.c
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/// \brief Floor splats
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#include "r_draw.h"
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#include "r_fps.h"
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#include "r_main.h"
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#include "r_splats.h"
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#include "r_bsp.h"
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#include "p_local.h"
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#include "p_slopes.h"
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#include "w_wad.h"
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#include "z_zone.h"
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struct rastery_s *prastertab; // for ASM code
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static struct rastery_s rastertab[MAXVIDHEIGHT];
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static void prepare_rastertab(void);
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// ==========================================================================
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// FLOOR SPLATS
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// ==========================================================================
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static void R_RasterizeFloorSplat(floorsplat_t *pSplat, vector2_t *verts, vissprite_t *vis);
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static void rasterize_segment_tex(INT32 x1, INT32 y1, INT32 x2, INT32 y2, INT32 tv1, INT32 tv2, INT32 tc, INT32 dir)
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{
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{
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fixed_t xs, xe, count;
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fixed_t dx0, dx1;
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if (y1 == y2)
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return;
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if (y2 > y1)
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{
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count = (y2-y1)+1;
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dx0 = FixedDiv((x2-x1)<<FRACBITS, count<<FRACBITS);
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dx1 = FixedDiv((tv2-tv1)<<FRACBITS, count<<FRACBITS);
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xs = x1 << FRACBITS;
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xe = tv1 << FRACBITS;
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tc <<= FRACBITS;
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if (dir == 0)
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{
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for (;;)
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{
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rastertab[y1].maxx = xs;
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rastertab[y1].tx2 = xe;
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rastertab[y1].ty2 = tc;
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xs += dx0;
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xe += dx1;
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y1++;
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if (count-- < 1) break;
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}
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}
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else
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{
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for (;;)
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{
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rastertab[y1].maxx = xs;
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rastertab[y1].tx2 = tc;
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rastertab[y1].ty2 = xe;
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xs += dx0;
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xe += dx1;
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y1++;
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if (count-- < 1) break;
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}
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}
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}
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else
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{
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count = (y1-y2)+1;
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dx0 = FixedDiv((x1-x2)<<FRACBITS, count<<FRACBITS);
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dx1 = FixedDiv((tv1-tv2)<<FRACBITS, count<<FRACBITS);
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xs = x2 << FRACBITS;
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xe = tv2 << FRACBITS;
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tc <<= FRACBITS;
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if (dir == 0)
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{
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for (;;)
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{
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rastertab[y2].minx = xs;
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rastertab[y2].tx1 = xe;
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rastertab[y2].ty1 = tc;
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xs += dx0;
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xe += dx1;
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y2++;
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if (count-- < 1) break;
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}
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}
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else
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{
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for (;;)
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{
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rastertab[y2].minx = xs;
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rastertab[y2].tx1 = tc;
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rastertab[y2].ty1 = xe;
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xs += dx0;
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xe += dx1;
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y2++;
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if (count-- < 1) break;
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}
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}
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}
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}
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}
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void R_DrawFloorSplat(vissprite_t *spr)
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{
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floorsplat_t splat;
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mobj_t *mobj = spr->mobj;
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fixed_t tr_x, tr_y, rot_x, rot_y, rot_z;
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vector3_t *v3d;
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vector2_t v2d[4];
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vector2_t rotated[4];
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fixed_t x, y;
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fixed_t w, h;
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angle_t angle, splatangle;
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fixed_t ca, sa;
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fixed_t xscale, yscale;
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fixed_t xoffset, yoffset;
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fixed_t leftoffset, topoffset;
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INT32 i;
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boolean hflip = (spr->xiscale < 0);
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boolean vflip = (spr->cut & SC_VFLIP);
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UINT8 flipflags = 0;
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renderflags_t renderflags = spr->renderflags;
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if (hflip)
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flipflags |= PICFLAGS_XFLIP;
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if (vflip)
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flipflags |= PICFLAGS_YFLIP;
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if (!mobj || P_MobjWasRemoved(mobj))
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return;
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Patch_GenerateFlat(spr->patch, flipflags);
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splat.pic = spr->patch->flats[flipflags];
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if (splat.pic == NULL)
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return;
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splat.mobj = mobj;
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splat.width = spr->patch->width;
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splat.height = spr->patch->height;
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splat.scale = mobj->scale;
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if (mobj->skin && ((skin_t *)mobj->skin)->flags & SF_HIRES)
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splat.scale = FixedMul(splat.scale, ((skin_t *)mobj->skin)->highresscale);
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if (spr->rotateflags & SRF_3D || renderflags & RF_NOSPLATBILLBOARD)
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splatangle = mobj->angle;
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else
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splatangle = spr->viewpoint.angle;
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if (!(spr->cut & SC_ISROTATED))
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splatangle += mobj->spriteroll;
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splat.angle = -splatangle;
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splat.angle += ANGLE_90;
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topoffset = spr->spriteyoffset;
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leftoffset = spr->spritexoffset;
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if (hflip)
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leftoffset = ((splat.width * FRACUNIT) - leftoffset);
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xscale = spr->spritexscale;
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yscale = spr->spriteyscale;
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splat.xscale = FixedMul(splat.scale, xscale);
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splat.yscale = FixedMul(splat.scale, yscale);
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xoffset = FixedMul(leftoffset, splat.xscale);
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yoffset = FixedMul(topoffset, splat.yscale);
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x = mobj->x;
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y = mobj->y;
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w = (splat.width * splat.xscale);
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h = (splat.height * splat.yscale);
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splat.x = x;
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splat.y = y;
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splat.z = spr->pz;
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splat.slope = NULL;
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// Set positions
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// 3--2
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// | |
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// 0--1
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splat.verts[0].x = w - xoffset;
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splat.verts[0].y = yoffset;
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splat.verts[1].x = -xoffset;
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splat.verts[1].y = yoffset;
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splat.verts[2].x = -xoffset;
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splat.verts[2].y = -h + yoffset;
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splat.verts[3].x = w - xoffset;
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splat.verts[3].y = -h + yoffset;
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angle = -splat.angle>>ANGLETOFINESHIFT;
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ca = FINECOSINE(angle);
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sa = FINESINE(angle);
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// Rotate
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for (i = 0; i < 4; i++)
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{
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rotated[i].x = FixedMul(splat.verts[i].x, ca) - FixedMul(splat.verts[i].y, sa);
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rotated[i].y = FixedMul(splat.verts[i].x, sa) + FixedMul(splat.verts[i].y, ca);
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}
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if (renderflags & (RF_SLOPESPLAT | RF_OBJECTSLOPESPLAT))
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{
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pslope_t *standingslope = mobj->standingslope; // The slope that the object is standing on.
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// The slope that was defined for the sprite.
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if (renderflags & RF_SLOPESPLAT)
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splat.slope = mobj->floorspriteslope;
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if (standingslope && (renderflags & RF_OBJECTSLOPESPLAT))
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splat.slope = standingslope;
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}
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// Translate
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for (i = 0; i < 4; i++)
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{
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tr_x = rotated[i].x + mobj->x;
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tr_y = rotated[i].y + mobj->y;
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if (splat.slope)
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{
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rot_z = P_GetSlopeZAt(splat.slope, tr_x, tr_y);
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splat.verts[i].z = rot_z;
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}
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else
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splat.verts[i].z = splat.z;
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splat.verts[i].x = tr_x;
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splat.verts[i].y = tr_y;
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}
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angle = spr->viewpoint.angle >> ANGLETOFINESHIFT;
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ca = FINECOSINE(angle);
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sa = FINESINE(angle);
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// Project
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for (i = 0; i < 4; i++)
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{
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v3d = &splat.verts[i];
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// transform the origin point
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tr_x = v3d->x - spr->viewpoint.x;
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tr_y = v3d->y - spr->viewpoint.y;
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// rotation around vertical y axis
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rot_x = FixedMul(tr_x - (mobj->x - x), sa) - FixedMul(tr_y - (mobj->y - y), ca);
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rot_y = FixedMul(tr_x - (mobj->x - x), ca) + FixedMul(tr_y - (mobj->y - y), sa);
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rot_z = v3d->z - spr->viewpoint.z;
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if (rot_y < FRACUNIT)
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return;
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// note: y from view above of map, is distance far away
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xscale = FixedDiv(projection, rot_y);
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yscale = -FixedDiv(projectiony, rot_y);
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// projection
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v2d[i].x = (centerxfrac + FixedMul(rot_x, xscale))>>FRACBITS;
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v2d[i].y = (centeryfrac + FixedMul(rot_z, yscale))>>FRACBITS;
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}
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R_RasterizeFloorSplat(&splat, v2d, spr);
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}
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// --------------------------------------------------------------------------
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// Rasterize the four edges of a floor splat polygon,
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// fill the polygon with linear interpolation, call span drawer for each
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// scan line
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// --------------------------------------------------------------------------
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static void R_RasterizeFloorSplat(floorsplat_t *pSplat, vector2_t *verts, vissprite_t *vis)
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{
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// rasterizing
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INT32 miny = viewheight + 1, maxy = 0;
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INT32 y, x1, ry1, x2, y2, i;
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fixed_t offsetx = 0, offsety = 0;
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fixed_t planeheight = 0;
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fixed_t step;
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int spanfunctype;
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#define RASTERPARAMS(vnum1, vnum2, tv1, tv2, tc, dir) \
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x1 = verts[vnum1].x; \
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ry1 = verts[vnum1].y; \
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x2 = verts[vnum2].x; \
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y2 = verts[vnum2].y; \
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if (y2 > ry1) \
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step = FixedDiv(x2-x1, y2-ry1+1); \
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else if (y2 == ry1) \
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step = 0; \
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else \
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step = FixedDiv(x2-x1, ry1-y2+1); \
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if (ry1 < 0) { \
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if (step) { \
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x1 <<= FRACBITS; \
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x1 += (-ry1)*step; \
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x1 >>= FRACBITS; \
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} \
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ry1 = 0; \
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} \
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if (ry1 >= vid.height) { \
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if (step) { \
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x1 <<= FRACBITS; \
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x1 -= (vid.height-1-ry1)*step; \
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x1 >>= FRACBITS; \
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} \
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ry1 = vid.height - 1; \
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} \
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if (y2 < 0) { \
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if (step) { \
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x2 <<= FRACBITS; \
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x2 -= (-y2)*step; \
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x2 >>= FRACBITS; \
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} \
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y2 = 0; \
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} \
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if (y2 >= vid.height) { \
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if (step) { \
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x2 <<= FRACBITS; \
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x2 += (vid.height-1-y2)*step; \
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x2 >>= FRACBITS; \
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} \
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y2 = vid.height - 1; \
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} \
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rasterize_segment_tex(x1, ry1, x2, y2, tv1, tv2, tc, dir); \
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if (ry1 < miny) \
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miny = ry1; \
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if (ry1 > maxy) \
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maxy = ry1;
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ds_source = (UINT8 *)pSplat->pic;
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ds_flatwidth = pSplat->width;
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ds_flatheight = pSplat->height;
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ds_powersoftwo = ds_solidcolor = ds_fog = false;
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if (R_CheckSolidColorFlat())
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ds_solidcolor = true;
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else if (R_CheckPowersOfTwo())
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{
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R_SetFlatVars(ds_flatwidth * ds_flatheight);
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ds_powersoftwo = true;
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}
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if (pSplat->slope)
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{
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R_SetScaledSlopePlane(pSplat->slope, vis->viewpoint.x, vis->viewpoint.y, vis->viewpoint.z, pSplat->xscale, pSplat->yscale, -pSplat->verts[0].x, pSplat->verts[0].y, vis->viewpoint.angle, pSplat->angle);
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}
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else if (!ds_solidcolor)
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{
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planeheight = abs(pSplat->z - vis->viewpoint.z);
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if (pSplat->angle)
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{
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// Add the view offset, rotated by the plane angle.
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fixed_t a = -pSplat->verts[0].x + vis->viewpoint.x;
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fixed_t b = -pSplat->verts[0].y + vis->viewpoint.y;
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angle_t angle = (pSplat->angle >> ANGLETOFINESHIFT);
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offsetx = FixedMul(a, FINECOSINE(angle)) - FixedMul(b, FINESINE(angle));
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offsety = -FixedMul(a, FINESINE(angle)) - FixedMul(b, FINECOSINE(angle));
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}
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else
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{
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offsetx = vis->viewpoint.x - pSplat->verts[0].x;
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offsety = pSplat->verts[0].y - vis->viewpoint.y;
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}
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}
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ds_colormap = vis->colormap;
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ds_translation = R_GetSpriteTranslation(vis);
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if (ds_translation == NULL)
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ds_translation = colormaps;
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if (vis->extra_colormap)
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{
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if (!ds_colormap)
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ds_colormap = vis->extra_colormap->colormap;
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else
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ds_colormap = &vis->extra_colormap->colormap[ds_colormap - colormaps];
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}
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ds_transmap = vis->transmap;
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// Determine which R_DrawWhatever to use
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// Solid color
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if (ds_solidcolor)
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{
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UINT16 px = *(UINT16 *)ds_source;
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// Uh, it's not visible.
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if (!(px & 0xFF00))
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return;
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// Pixel color is contained in the lower 8 bits (upper 8 are the opacity), so advance the pointer
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ds_source++;
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if (pSplat->slope)
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{
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if (ds_transmap)
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spanfunctype = SPANDRAWFUNC_TILTEDTRANSSOLID;
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else
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spanfunctype = SPANDRAWFUNC_TILTEDSOLID;
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}
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else
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{
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if (ds_transmap)
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spanfunctype = SPANDRAWFUNC_TRANSSOLID;
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else
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spanfunctype = SPANDRAWFUNC_SOLID;
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}
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}
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// Transparent
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else if (ds_transmap)
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{
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if (pSplat->slope)
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spanfunctype = SPANDRAWFUNC_TILTEDTRANSSPRITE;
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else
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spanfunctype = SPANDRAWFUNC_TRANSSPRITE;
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}
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// Opaque
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else
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{
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if (pSplat->slope)
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spanfunctype = SPANDRAWFUNC_TILTEDSPRITE;
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else
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spanfunctype = SPANDRAWFUNC_SPRITE;
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}
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if (ds_powersoftwo || ds_solidcolor)
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spanfunc = spanfuncs[spanfunctype];
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else
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spanfunc = spanfuncs_npo2[spanfunctype];
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prepare_rastertab();
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// do segment a -> top of texture
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RASTERPARAMS(3,2,0,pSplat->width-1,0,0);
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// do segment b -> right side of texture
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RASTERPARAMS(2,1,0,pSplat->width-1,pSplat->height-1,0);
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// do segment c -> bottom of texture
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RASTERPARAMS(1,0,pSplat->width-1,0,pSplat->height-1,0);
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// do segment d -> left side of texture
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RASTERPARAMS(0,3,pSplat->width-1,0,0,1);
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if (maxy >= vid.height)
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maxy = vid.height-1;
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for (y = miny; y <= maxy; y++)
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{
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boolean cliptab[MAXVIDWIDTH+1];
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x1 = rastertab[y].minx>>FRACBITS;
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x2 = rastertab[y].maxx>>FRACBITS;
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if (x1 > x2)
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{
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INT32 swap = x1;
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x1 = x2;
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x2 = swap;
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}
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if (x1 == INT16_MIN || x2 == INT16_MAX)
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continue;
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if (x1 < 0)
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x1 = 0;
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if (x2 >= viewwidth)
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x2 = viewwidth - 1;
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if (x1 >= viewwidth || x2 < 0)
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continue;
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for (i = x1; i <= x2; i++)
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cliptab[i] = (y >= mfloorclip[i] || y <= mceilingclip[i]);
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// clip left
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while (cliptab[x1])
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{
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x1++;
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if (x1 >= viewwidth)
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|
break;
|
|
}
|
|
|
|
// clip right
|
|
i = x2;
|
|
|
|
while (i > x1)
|
|
{
|
|
if (cliptab[i])
|
|
x2 = i-1;
|
|
i--;
|
|
if (i < 0)
|
|
break;
|
|
}
|
|
|
|
if (x2 < x1)
|
|
continue;
|
|
|
|
if (!ds_solidcolor && !pSplat->slope)
|
|
{
|
|
fixed_t xstep, ystep;
|
|
fixed_t distance, span;
|
|
|
|
angle_t angle = (vis->viewpoint.angle + pSplat->angle)>>ANGLETOFINESHIFT;
|
|
angle_t planecos = FINECOSINE(angle);
|
|
angle_t planesin = FINESINE(angle);
|
|
|
|
// [RH] Notice that I dumped the caching scheme used by Doom.
|
|
// It did not offer any appreciable speedup.
|
|
distance = FixedMul(planeheight, yslope[y]);
|
|
span = abs(centery - y);
|
|
|
|
if (span) // Don't divide by zero
|
|
{
|
|
xstep = FixedMul(planesin, planeheight) / span;
|
|
ystep = FixedMul(planecos, planeheight) / span;
|
|
}
|
|
else
|
|
xstep = ystep = FRACUNIT;
|
|
|
|
ds_xstep = FixedDiv(xstep, pSplat->xscale);
|
|
ds_ystep = FixedDiv(ystep, pSplat->yscale);
|
|
|
|
ds_xfrac = FixedDiv(offsetx + FixedMul(planecos, distance) + (x1 - centerx) * xstep, pSplat->xscale);
|
|
ds_yfrac = FixedDiv(offsety - FixedMul(planesin, distance) + (x1 - centerx) * ystep, pSplat->yscale);
|
|
}
|
|
|
|
ds_y = y;
|
|
ds_x1 = x1;
|
|
ds_x2 = x2;
|
|
spanfunc();
|
|
|
|
rastertab[y].minx = INT32_MAX;
|
|
rastertab[y].maxx = INT32_MIN;
|
|
}
|
|
}
|
|
|
|
static void prepare_rastertab(void)
|
|
{
|
|
INT32 i;
|
|
prastertab = rastertab;
|
|
for (i = 0; i < vid.height; i++)
|
|
{
|
|
rastertab[i].minx = INT32_MAX;
|
|
rastertab[i].maxx = INT32_MIN;
|
|
}
|
|
}
|