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hng64: re-implemented zooming in Fatal Fury WA, and added alternative zooming mode used by the other games, they have some precision bugs though [Angelo Salese]

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Angelo Salese 2009-11-26 01:59:15 +00:00
parent 58e1ff522a
commit 6693a2612e
1 changed files with 20 additions and 26 deletions
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46
src/mame/video/hng64.c
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@ -138,7 +138,7 @@ static struct polygon *polys ;
* UINT32 | Bits | Use * UINT32 | Bits | Use
* | 3322 2222 2222 1111 1111 11 | * | 3322 2222 2222 1111 1111 11 |
* -------+-1098-7654-3210-9876-5432-1098-7654-3210-+---------------- * -------+-1098-7654-3210-9876-5432-1098-7654-3210-+----------------
* 0 | ---- ---- x--- ---- ---- ---- ---- ---- | bpp select * 0 | ---- z--- b--- ---- ---- ---- ---- ---- | zooming mode, bpp select
* 1 | yyyy yyyy yyyy yyyy xxxx xxxx xxxx xxxx | global sprite offset (ss64 rankings in attract) * 1 | yyyy yyyy yyyy yyyy xxxx xxxx xxxx xxxx | global sprite offset (ss64 rankings in attract)
* 2 | ---- ---- ---- ---- ---- ---- ---- ---- | * 2 | ---- ---- ---- ---- ---- ---- ---- ---- |
* 3 | ---- ---- ---- ---- ---- ---- ---- ---- | * 3 | ---- ---- ---- ---- ---- ---- ---- ---- |
@ -147,7 +147,6 @@ static struct polygon *polys ;
* Notes: * Notes:
* [0] * [0]
* 0xf0000000 setted in both Samurai Shodown * 0xf0000000 setted in both Samurai Shodown
* 0x08000000 setted by Fatal Fury WA only, zooming mode?
* 0x00060000 always setted in all the games * 0x00060000 always setted in all the games
* 0x00010000 setted in POST, sprite disable? * 0x00010000 setted in POST, sprite disable?
* [4] * [4]
@ -178,7 +177,7 @@ static void draw_sprites(running_machine *machine, bitmap_t *bitmap, const recta
int chaini; int chaini;
int zbuf; int zbuf;
UINT32 zoomx,zoomy; UINT32 zoomx,zoomy;
//float foomX, foomY; float foomX, foomY;
zbuf = (source[2]&0x07ff0000)>>16; zbuf = (source[2]&0x07ff0000)>>16;
#if 1 #if 1
@ -211,24 +210,24 @@ static void draw_sprites(running_machine *machine, bitmap_t *bitmap, const recta
// source[4], source[5], source[6], source[7]) ; // source[4], source[5], source[6], source[7]) ;
/* Calculate the zoom */ /* Calculate the zoom */
/* First, prevent any possible divide by zero errors */ {
int zoom_factor;
#if 0 /* FIXME: regular zoom mode has precision bugs, can be easily seen in Samurai Shodown 64 intro */
if(!zoomx) zoomx=0x1000; zoom_factor = (hng64_spriteregs[0] & 0x08000000) ? 0x1000 : 0x100;
if(!zoomy) zoomy=0x1000; if(!zoomx) zoomx=zoom_factor;
if(!zoomy) zoomy=zoom_factor;
foomX = (float)(0x1000) / (float)zoomx ; /* First, prevent any possible divide by zero errors */
foomY = (float)(0x1000) / (float)zoomy ; foomX = (float)(zoom_factor) / (float)zoomx ;
foomY = (float)(zoom_factor) / (float)zoomy ;
zoomx = ((int)foomX) << 16 ; zoomx = ((int)foomX) << 16 ;
zoomy = ((int)foomY) << 16 ; zoomy = ((int)foomY) << 16 ;
zoomx += (int)((foomX - floor(foomX)) * (float)0x10000) ; zoomx += (int)((foomX - floor(foomX)) * (float)0x10000) ;
zoomy += (int)((foomY - floor(foomY)) * (float)0x10000) ; zoomy += (int)((foomY - floor(foomY)) * (float)0x10000) ;
#endif }
zoomx = 0x10000;
zoomy = 0x10000;
if (hng64_spriteregs[0] & 0x00800000) //bpp switch if (hng64_spriteregs[0] & 0x00800000) //bpp switch
{ {
@ -244,27 +243,22 @@ static void draw_sprites(running_machine *machine, bitmap_t *bitmap, const recta
// Accomodate for chaining and flipping // Accomodate for chaining and flipping
if(xflip) if(xflip)
{ {
//xinc=-(int)(16.0f*foomX); xinc=-(int)(16.0f*foomX);
xinc=-16;
xpos-=xinc*chainx; xpos-=xinc*chainx;
} }
else else
{ {
//xinc=(int)(16.0f*foomX); xinc=(int)(16.0f*foomX);
xinc = 16;
} }
if(yflip) if(yflip)
{ {
//yinc=-(int)(16.0f*foomY); yinc=-(int)(16.0f*foomY);
yinc = -16;
ypos-=yinc*chainy; ypos-=yinc*chainy;
} }
else else
{ {
yinc = 16; yinc=(int)(16.0f*foomY);
//yinc=(int)(16.0f*foomY);
} }