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