65 lines
1.6 KiB
C++
Executable File
65 lines
1.6 KiB
C++
Executable File
#include "version.h"
|
|
|
|
#ifdef USE_PARALLAX
|
|
|
|
#include "wl_def.h"
|
|
|
|
#ifdef USE_FEATUREFLAGS
|
|
|
|
// The lower left tile of every map determines the start texture of the parallax sky.
|
|
static int GetParallaxStartTexture()
|
|
{
|
|
int startTex = ffDataBottomLeft;
|
|
assert(startTex >= 0 && startTex < PMSpriteStart);
|
|
return startTex;
|
|
}
|
|
|
|
#else
|
|
|
|
static int GetParallaxStartTexture()
|
|
{
|
|
int startTex;
|
|
switch(gamestate.episode * 10 + mapon)
|
|
{
|
|
case 0: startTex = 20; break;
|
|
default: startTex = 0; break;
|
|
}
|
|
assert(startTex >= 0 && startTex < PMSpriteStart);
|
|
return startTex;
|
|
}
|
|
|
|
#endif
|
|
|
|
void DrawParallax(byte *vbuf, unsigned vbufPitch)
|
|
{
|
|
int startpage = GetParallaxStartTexture();
|
|
int midangle = player->angle * (FINEANGLES / ANGLES);
|
|
int skyheight = viewheight >> 1;
|
|
int curtex = -1;
|
|
byte *skytex;
|
|
|
|
startpage += USE_PARALLAX - 1;
|
|
|
|
for(int x = 0; x < viewwidth; x++)
|
|
{
|
|
int curang = pixelangle[x] + midangle;
|
|
if(curang < 0) curang += FINEANGLES;
|
|
else if(curang >= FINEANGLES) curang -= FINEANGLES;
|
|
int xtex = curang * USE_PARALLAX * TEXTURESIZE / FINEANGLES;
|
|
int newtex = xtex >> TEXTURESHIFT;
|
|
if(newtex != curtex)
|
|
{
|
|
curtex = newtex;
|
|
skytex = PM_GetTexture(startpage - curtex);
|
|
}
|
|
int texoffs = TEXTUREMASK - ((xtex & (TEXTURESIZE - 1)) << TEXTURESHIFT);
|
|
int yend = skyheight - (wallheight[x] >> 3);
|
|
if(yend <= 0) continue;
|
|
|
|
for(int y = 0, offs = x; y < yend; y++, offs += vbufPitch)
|
|
vbuf[offs] = skytex[texoffs + (y * TEXTURESIZE) / skyheight];
|
|
}
|
|
}
|
|
|
|
#endif
|