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Naomi renderer: add yuv-linear textures, but it's kinda useless without the TA yuv pipe.

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This commit is contained in:
Olivier Galibert 2009-05-04 23:22:54 +00:00
parent 0480162bcc
commit f0d2b4ff53
1 changed files with 30 additions and 0 deletions
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30
src/mame/video/dc.c
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@ -149,6 +149,31 @@ INLINE UINT32 cv_4444(UINT16 c)
((c << 4) & 0x000000f0) | ((c ) & 0x0000000f);
}
INLINE UINT32 cv_yuv(UINT16 c1, UINT16 c2, int x)
{
int u = 11*((c1 & 0xff) - 128);
int v = 11*((c2 & 0xff) - 128);
int y = (x & 1 ? c2 : c1) >> 8;
int r = y + v/8;
int g = y - u/32 - v/16;
int b = y + (3*u)/16;
r = r < 0 ? 0 : r > 255 ? 255 : r;
g = g < 0 ? 0 : g > 255 ? 255 : g;
b = b < 0 ? 0 : b > 255 ? 255 : b;
return 0xff000000 | (r << 16) | (g << 8) | b;
}
static UINT32 tex_r_yuv_n(texinfo *t, float x, float y)
{
int xt = ((int)x) & (t->sizex-1);
int yt = ((int)y) & (t->sizey-1);
int addrp = t->address + (t->sizex*yt + (xt & ~1))*2;
UINT16 c1 = *(UINT16 *)(((UINT8 *)dc_texture_ram) + WORD_XOR_LE(addrp));
UINT16 c2 = *(UINT16 *)(((UINT8 *)dc_texture_ram) + WORD_XOR_LE(addrp+2));
return cv_yuv(c1, c2, xt);
}
static UINT32 tex_r_1555_n(texinfo *t, float x, float y)
{
int xt = ((int)x) & (t->sizex-1);
@ -418,6 +443,11 @@ static void tex_prepare(texinfo *t)
break;
case 3: // yuv422
switch(t->mode) {
case 0: /*t->r = tex_r_yuv_tw*/; break;
case 1: t->r = tex_r_yuv_n; break;
default: /*t->r = tex_r_yuv_vq*/; break;
}
break;
case 4: // bumpmap