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improve "blocky fuzz" rendering, remove branches (#2027)

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Roman Fomin 2024-11-19 16:02:22 +07:00 committed by GitHub
parent 4115c9500f
commit bc2f6d3aeb
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1 changed files with 49 additions and 43 deletions
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92
src/r_draw.c
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@ -26,6 +26,7 @@
#include "doomtype.h"
#include "i_system.h"
#include "i_video.h"
#include "m_fixed.h"
#include "r_bsp.h"
#include "r_bmaps.h"
#include "r_defs.h"
@ -326,16 +327,18 @@ void R_DrawSkyColumn(void)
//
#define FUZZTABLE 50
#define FUZZOFF 1
// killough 11/98: convert fuzzoffset to be screenwidth-independent
static const int fuzzoffset[FUZZTABLE] = {
0,-1,0,-1,0,0,-1,
0,0,-1,0,0,0,-1,
0,0,0,-1,-1,-1,-1,
0,-1,-1,0,0,0,0,-1,
0,-1,0,0,-1,-1,0,
0,-1,-1,-1,-1,0,0,
0,0,-1,0,0,-1,0
static const int fuzzoffset[FUZZTABLE] =
{
FUZZOFF,-FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,
FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,
FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,
FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,
FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,
FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,
FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF,FUZZOFF,-FUZZOFF,FUZZOFF
};
static int fuzzpos = 0;
@ -423,50 +426,45 @@ static void R_DrawFuzzColumn_orig(void)
// why_i_left_doom.html
*dest =
fullcolormap[6 * 256
+ dest[fuzzoffset[fuzzpos] ? -linesize : linesize]];
fullcolormap[6 * 256 + dest[linesize * fuzzoffset[fuzzpos]]];
dest += linesize; // killough 11/98
++fuzzpos;
if (fuzzpos == FUZZTABLE)
fuzzpos = 0;
// Clamp table lookup index.
fuzzpos &= (fuzzpos - FUZZTABLE) >> (8 * sizeof(fuzzpos) - 1); // killough 1/99
} while (--count);
// [crispy] if the line at the bottom had to be cut off,
// draw one extra line using only pixels of that line and the one above
if (cutoff)
{
*dest = fullcolormap[6 * 256 + dest[linesize * fuzzoffset[fuzzpos]]];
*dest = fullcolormap
[6 * 256 + dest[linesize * (fuzzoffset[fuzzpos] - FUZZOFF) / 2]];
}
}
// [FG] "blocky" spectre drawing for hires mode
static int fuzzblocksize;
static void R_DrawFuzzColumn_block(void)
{
boolean cutoff = false;
const int nx = video.xscale >> FRACBITS;
const int ny = video.yscale >> FRACBITS;
if (dc_x % nx)
if (dc_x % fuzzblocksize)
{
return;
}
dc_yl += ny;
dc_yl -= dc_yl % ny;
dc_yh -= dc_yh % ny;
if (!dc_yl)
{
dc_yl = ny;
dc_yl = 1;
}
if (dc_yh >= viewheight - ny)
if (dc_yh == viewheight - 1)
{
dc_yh = viewheight - 2 * ny;
dc_yh = viewheight - 2;
cutoff = true;
}
@ -484,40 +482,47 @@ static void R_DrawFuzzColumn_block(void)
}
#endif
++count;
byte *dest = ylookup[dc_yl] + columnofs[dc_x];
count += ny;
int lines = fuzzblocksize - (dc_yl % fuzzblocksize);
do
{
// [FG] draw only even pixels as (nx * ny) squares
// using the same fuzzoffset value
const int offset = fuzzoffset[fuzzpos] ? -ny * linesize : ny * linesize;
const byte fuzz = fullcolormap[6 * 256 + dest[offset]];
count -= lines;
for (int i = 0; i < ny && count - i > 0; i++)
// if (count < 0)
// {
// lines += count;
// count = 0;
// }
const int mask = count >> (8 * sizeof(mask) - 1);
lines += count & mask;
count &= ~mask;
const byte fuzz =
fullcolormap[6 * 256 + dest[linesize * fuzzoffset[fuzzpos]]];
do
{
memset(dest, fuzz, nx);
memset(dest, fuzz, fuzzblocksize);
dest += linesize;
}
} while (--lines);
++fuzzpos;
if (fuzzpos == FUZZTABLE)
fuzzpos = 0;
// Clamp table lookup index.
fuzzpos &= (fuzzpos - FUZZTABLE) >> (8 * sizeof(fuzzpos) - 1); // killough 1/99
} while ((count -= ny) > 0);
lines = fuzzblocksize;
} while (count);
if (cutoff)
{
const int offset = ny * linesize * fuzzoffset[fuzzpos];
const byte fuzz = fullcolormap[6 * 256 + dest[offset]];
for (int i = 0; i < ny; i++)
{
memset(dest, fuzz, nx);
dest += linesize;
}
const byte fuzz = fullcolormap
[6 * 256 + dest[linesize * (fuzzoffset[fuzzpos] - FUZZOFF) / 2]];
memset(dest, fuzz, fuzzblocksize);
}
}
@ -530,6 +535,7 @@ void R_SetFuzzColumnMode(void)
{
if (fuzzcolumn_mode && current_video_height > SCREENHEIGHT)
{
fuzzblocksize = FixedToInt(video.yscale);
R_DrawFuzzColumn = R_DrawFuzzColumn_block;
}
else