88 lines
3.4 KiB
C
88 lines
3.4 KiB
C
#include "version.h"
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#ifdef USE_FLOORCEILINGTEX
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#include "wl_def.h"
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#include "wl_shade.h"
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// Textured Floor and Ceiling by DarkOne
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// With multi-textured floors and ceilings stored in lower and upper bytes of
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// according tile in third mapplane, respectively.
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void DrawFloorAndCeiling(byte *vbuf, unsigned vbufPitch, int min_wallheight)
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{
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fixed dist; // distance to row projection
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fixed tex_step; // global step per one screen pixel
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fixed gu, gv, du, dv; // global texture coordinates
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int u, v; // local texture coordinates
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byte *toptex, *bottex;
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unsigned lasttoptex = 0xffffffff, lastbottex = 0xffffffff;
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int halfheight = viewheight >> 1;
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int y0 = min_wallheight >> 3; // starting y value
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if(y0 > halfheight)
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return; // view obscured by walls
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if(!y0) y0 = 1; // don't let division by zero
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unsigned bot_offset0 = vbufPitch * (halfheight + y0);
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unsigned top_offset0 = vbufPitch * (halfheight - y0 - 1);
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// draw horizontal lines
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for(int y = y0, bot_offset = bot_offset0, top_offset = top_offset0;
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y < halfheight; y++, bot_offset += vbufPitch, top_offset -= vbufPitch)
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{
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dist = (heightnumerator / (y + 1)) << 5;
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gu = viewx + FixedMul(dist, viewcos);
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gv = -viewy + FixedMul(dist, viewsin);
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tex_step = (dist << 8) / viewwidth / 175;
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du = FixedMul(tex_step, viewsin);
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dv = -FixedMul(tex_step, viewcos);
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gu -= (viewwidth >> 1) * du;
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gv -= (viewwidth >> 1) * dv; // starting point (leftmost)
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#ifdef USE_SHADING
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byte *curshades = shadetable[GetShade(y << 3)];
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#endif
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for(int x = 0, bot_add = bot_offset, top_add = top_offset;
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x < viewwidth; x++, bot_add++, top_add++)
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{
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if(wallheight[x] >> 3 <= y)
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{
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int curx = (gu >> TILESHIFT) & (MAPSIZE - 1);
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int cury = (-(gv >> TILESHIFT) - 1) & (MAPSIZE - 1);
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unsigned curtex = MAPSPOT(curx, cury, 2);
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if(curtex)
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{
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unsigned curtoptex = curtex >> 8;
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if (curtoptex != lasttoptex)
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{
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lasttoptex = curtoptex;
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toptex = PM_GetTexture(curtoptex);
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}
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unsigned curbottex = curtex & 0xff;
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if (curbottex != lastbottex)
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{
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lastbottex = curbottex;
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bottex = PM_GetTexture(curbottex);
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}
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u = (gu >> (TILESHIFT - TEXTURESHIFT)) & (TEXTURESIZE - 1);
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v = (gv >> (TILESHIFT - TEXTURESHIFT)) & (TEXTURESIZE - 1);
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unsigned texoffs = (u << TEXTURESHIFT) + (TEXTURESIZE - 1) - v;
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#ifdef USE_SHADING
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if(curtoptex)
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vbuf[top_add] = curshades[toptex[texoffs]];
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if(curbottex)
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vbuf[bot_add] = curshades[bottex[texoffs]];
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#else
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if(curtoptex)
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vbuf[top_add] = toptex[texoffs];
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if(curbottex)
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vbuf[bot_add] = bottex[texoffs];
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#endif
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}
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}
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gu += du;
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gv += dv;
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}
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}
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}
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#endif
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