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Out Run: simpler sprite logic (#10420)

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Jose Tejada 2022-10-16 10:39:20 +02:00 committed by GitHub
parent cab27c66bf
commit d188072d81
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 36 additions and 45 deletions
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81
src/mame/sega/sega16sp.cpp
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@ -1154,56 +1154,47 @@ void sega_outrun_sprite_device::draw(bitmap_ind16 &bitmap, const rectangle &clip
int xacc = 0; int xacc = 0;
int x; int x;
// non-flipped case data[7] = addr;
if (!flip) for (x = xpos; (xdelta > 0 && x <= cliprect.max_x) || (xdelta < 0 && x >= cliprect.min_x);)
{ {
// start at the word before because we preincrement below uint32_t pixels = spritedata[data[7]];
data[7] = addr - 1; if (flip)
for (x = xpos; (xdelta > 0 && x <= cliprect.max_x) || (xdelta < 0 && x >= cliprect.min_x); )
{ {
uint32_t pixels = spritedata[++data[7]]; data[7]--;
// draw four pixels
int pix;
pix = (pixels >> 28) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200;
pix = (pixels >> 24) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200;
pix = (pixels >> 20) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200;
pix = (pixels >> 16) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200;
pix = (pixels >> 12) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200;
pix = (pixels >> 8) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200;
pix = (pixels >> 4) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200;
pix = (pixels >> 0) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200;
// stop if the second-to-last pixel in the group was 0xf
if ((pixels & 0x000000f0) == 0x000000f0)
break;
} }
} else
// flipped case
else
{
// start at the word after because we predecrement below
data[7] = addr + 1;
for (x = xpos; (xdelta > 0 && x <= cliprect.max_x) || (xdelta < 0 && x >= cliprect.min_x); )
{ {
uint32_t pixels = spritedata[--data[7]]; data[7]++;
pixels =
// draw four pixels (( pixels << 28) & 0xf0000000) |
int pix; (( pixels << 20) & 0x0f000000) |
pix = (pixels >> 0) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200; (( pixels << 12) & 0x00f00000) |
pix = (pixels >> 4) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200; (( pixels << 4) & 0x000f0000) |
pix = (pixels >> 8) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200; (( pixels >> 4) & 0x0000f000) |
pix = (pixels >> 12) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200; (( pixels >> 12) & 0x00000f00) |
pix = (pixels >> 16) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200; (( pixels >> 20) & 0x000000f0) |
pix = (pixels >> 20) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200; (( pixels >> 28) & 0x0000000f);
pix = (pixels >> 24) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200;
pix = (pixels >> 28) & 0xf; while (xacc < 0x200) { if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15) dest[x] = colpri | pix; x += xdelta; xacc += hzoom; } xacc -= 0x200;
// stop if the second-to-last pixel in the group was 0xf
if ((pixels & 0x0f000000) == 0x0f000000)
break;
} }
bool last_data = (pixels & 0x0f00'0000) == 0x0f00'0000;
// draw eight pixels
for (int k=0; k<8; k++)
{
int pix = pixels & 0xf;
while (xacc < 0x200)
{
if (x >= cliprect.min_x && x <= cliprect.max_x && pix != 0 && pix != 15)
dest[x] = colpri | pix;
x += xdelta;
xacc += hzoom;
}
xacc -= 0x200;
pixels>>=4;
}
// stop if the second-to-last pixel in the group was 0xf
if (last_data)
break;
} }
// update bounds // update bounds