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AmigActive 10
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vidhrdw
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speedbal.c
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C/C++ Source or Header
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2000-05-04
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10KB
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396 lines
/****************************************************************************
* *
* vidhrdw.c *
* *
* Functions to emulate the video hardware of the machine. *
* *
****************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
#define SPRITE_X 0
#define SPRITE_NUMBER 1
#define SPRITE_PALETTE 2
#define SPRITE_Y 3
extern unsigned char *speedbal_background_videoram;
extern unsigned char *speedbal_foreground_videoram;
extern unsigned char *speedbal_sprites_dataram;
extern size_t speedbal_background_videoram_size;
extern size_t speedbal_foreground_videoram_size;
extern size_t speedbal_sprites_dataram_size;
static unsigned char *bg_dirtybuffer; /* background tiles */
static unsigned char *ch_dirtybuffer; /* foreground char */
static struct osd_bitmap *bitmap_bg; /* background tiles */
static struct osd_bitmap *bitmap_ch; /* foreground char */
void speedbal_vh_convert_color_prom(unsigned char *palette, unsigned short *colortable,const unsigned char *color_prom)
{
int i;
#define TOTAL_COLORS(gfxn) (Machine->gfx[gfxn]->total_colors * Machine->gfx[gfxn]->color_granularity)
#define COLOR(gfxn,offs) (colortable[Machine->drv->gfxdecodeinfo[gfxn].color_codes_start + offs])
for (i = 0;i < Machine->drv->total_colors;i++)
{
int bit0,bit1,bit2;
/* red component */
bit0 = (*color_prom >> 0) & 0x01;
bit1 = (*color_prom >> 1) & 0x01;
bit2 = (*color_prom >> 2) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (*color_prom >> 3) & 0x01;
bit1 = (*color_prom >> 4) & 0x01;
bit2 = (*color_prom >> 5) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (*color_prom >> 6) & 0x01;
bit2 = (*color_prom >> 7) & 0x01;
*(palette++) = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
color_prom++;
}
/* characters */
for (i = 0;i < TOTAL_COLORS(0);i++)
COLOR(0,i) = *(color_prom++) ;
/* tiles */
for (i = 0;i < TOTAL_COLORS(1);i++)
COLOR(1,i) = *(color_prom++) & 0x0f;
/* sprites */
for (i = 0;i < TOTAL_COLORS(2);i++)
COLOR(2,i) = *(color_prom++) & 0x0f;
}
/*************************************
* *
* Start-Stop *
* *
*************************************/
int speedbal_vh_start (void)
{
if ((bg_dirtybuffer = malloc (speedbal_background_videoram_size)) == 0)
{
return 1;
}
if ((ch_dirtybuffer = malloc (speedbal_foreground_videoram_size)) == 0)
{
free (bg_dirtybuffer);
return 1;
}
/* foreground bitmap */
if ((bitmap_ch = osd_new_bitmap (Machine->drv->screen_width,Machine->drv->screen_height,Machine->scrbitmap->depth)) == 0)
{
free (bg_dirtybuffer);
free (ch_dirtybuffer);
return 1;
}
/* background bitmap */
if ((bitmap_bg = osd_new_bitmap (Machine->drv->screen_width*2,Machine->drv->screen_height*2,Machine->scrbitmap->depth)) == 0)
{
free (bg_dirtybuffer);
free (ch_dirtybuffer);
osd_free_bitmap (bitmap_ch);
return 1;
}
memset (ch_dirtybuffer,1,speedbal_foreground_videoram_size / 2);
memset (bg_dirtybuffer,1,speedbal_background_videoram_size / 2);
return 0;
}
void speedbal_vh_stop (void)
{
osd_free_bitmap (bitmap_ch);
osd_free_bitmap (bitmap_bg);
free (bg_dirtybuffer);
free (ch_dirtybuffer);
}
/*************************************
* *
* Foreground characters RAM *
* *
*************************************/
WRITE_HANDLER( speedbal_foreground_videoram_w )
{
ch_dirtybuffer[offset] = 1;
speedbal_foreground_videoram[offset]=data;
}
READ_HANDLER( speedbal_foreground_videoram_r )
{
return speedbal_foreground_videoram[offset];
}
/*************************************
* *
* Background tiles RAM *
* *
*************************************/
WRITE_HANDLER( speedbal_background_videoram_w )
{
bg_dirtybuffer[offset] = 1;
speedbal_background_videoram[offset] = data;
}
READ_HANDLER( speedbal_background_videoram_r )
{
return speedbal_background_videoram[offset];
}
/*************************************
* *
* Sprite drawing *
* *
*************************************/
void speedbal_draw_sprites (struct osd_bitmap *bitmap)
{
int SPTX,SPTY,SPTTile,SPTColor,offset,f;
unsigned char carac;
unsigned char *SPTRegs;
/* Drawing sprites: 64 in total */
for (offset = 0;offset < speedbal_sprites_dataram_size;offset += 4)
{
SPTRegs = &speedbal_sprites_dataram[offset];
SPTX = 243 - SPTRegs[SPRITE_Y];
SPTY = 239 - SPTRegs[SPRITE_X];
carac = SPTRegs[SPRITE_NUMBER ];
SPTTile=0;
for (f=0;f<8;f++) SPTTile+= ((carac >>f)&1)<<(7-f);
SPTColor = (SPTRegs[SPRITE_PALETTE]&0x0f);
if (!(SPTRegs[SPRITE_PALETTE]&0x40)) SPTTile+=256;
drawgfx (bitmap,Machine->gfx[2],
SPTTile,
SPTColor,
0,0,
SPTX,SPTY,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
}
}
/*************************************
* *
* Background drawing: Tiles *
* *
*************************************/
void speedbal_draw_background (struct osd_bitmap *bitmap)
{
int sx,sy,code,tile,offset,color;
for (offset = 0;offset < speedbal_background_videoram_size ;offset+=2)
{
if (bg_dirtybuffer[offset])
{
bg_dirtybuffer[offset] = 0;
tile = speedbal_background_videoram[offset+0];
code = speedbal_background_videoram[offset+1];
tile += (code & 0x30) << 4;
color=(code&0x0f);
sx = 15 - (offset / 2) / 16;
sy = (offset / 2) % 16;
drawgfx (bitmap,Machine->gfx[1],
tile,
color,
0,0,
16*sx,16*sy,
0,TRANSPARENCY_NONE,0);
}
}
}
/*************************************
* *
* Foreground drawing: 8x8 graphs *
* *
*************************************/
void speedbal_draw_foreground1 (struct osd_bitmap *bitmap)
{
int sx,sy,code,caracter,color,offset;
for (offset = 0;offset < speedbal_foreground_videoram_size ;offset+=2)
{
if (ch_dirtybuffer[offset])
{
caracter = speedbal_foreground_videoram[offset];
code = speedbal_foreground_videoram[offset+1];
caracter += (code & 0x30) << 4;
color=(code&0x0f);
sx = 31 - (offset / 2) / 32;
sy = (offset / 2) % 32;
drawgfx (bitmap,Machine->gfx[0],
caracter,
color,
0,0,
8*sx,8*sy,
0,TRANSPARENCY_NONE,0);
ch_dirtybuffer[offset] = 0;
}
}
}
/*************************************
* *
* Refresh screen *
* *
*************************************/
void speedbal_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
palette_init_used_colors();
{
int color,code,i;
int colmask[16];
int pal_base;
pal_base = Machine->drv->gfxdecodeinfo[1].color_codes_start;
for (color = 0;color < 16;color++) colmask[color] = 0;
for (offs = 0;offs < speedbal_background_videoram_size ;offs += 2)
{
code = speedbal_background_videoram[offs];
color = speedbal_background_videoram[offs+1];
code += (color & 0x30) << 4;
color = (color & 0x0f);
colmask[color] |= Machine->gfx[1]->pen_usage[code];
}
for (color = 0;color < 16;color++)
{
for (i = 0;i < 16;i++)
{
if (colmask[color] & (1 << i))
palette_used_colors[pal_base + 16 * color + i] = PALETTE_COLOR_USED;
}
}
pal_base = Machine->drv->gfxdecodeinfo[2].color_codes_start;
for (color = 0;color < 16;color++) colmask[color] = 0;
for (offs = 0;offs < speedbal_sprites_dataram_size;offs += 4)
{
unsigned char *SPTRegs;
int carac,f;
SPTRegs = &speedbal_sprites_dataram[offs];
carac = SPTRegs[SPRITE_NUMBER ];
code = 0;
for (f=0;f<8;f++) code += ((carac >>f)&1)<<(7-f);
color = (SPTRegs[SPRITE_PALETTE]&0x0f);
if (!(SPTRegs[SPRITE_PALETTE]&0x40)) code+=256;
colmask[color] |= Machine->gfx[2]->pen_usage[code];
}
for (color = 0;color < 16;color++)
{
if (colmask[color] & (1 << 0))
palette_used_colors[pal_base + 16 * color] = PALETTE_COLOR_TRANSPARENT;
for (i = 1;i < 16;i++)
{
if (colmask[color] & (1 << i))
palette_used_colors[pal_base + 16 * color + i] = PALETTE_COLOR_USED;
}
}
pal_base = Machine->drv->gfxdecodeinfo[0].color_codes_start;
for (color = 0;color < 16;color++) colmask[color] = 0;
for (offs = 0;offs < speedbal_foreground_videoram_size ;offs+=2)
{
code = speedbal_foreground_videoram[offs];
color = speedbal_foreground_videoram[offs+1];
code += (color & 0x30) << 4;
color = (color & 0x0f);
colmask[color] |= Machine->gfx[0]->pen_usage[code];
}
for (color = 0;color < 16;color++)
{
if (colmask[color] & (1 << 0))
palette_used_colors[pal_base + 16 * color] = PALETTE_COLOR_TRANSPARENT;
for (i = 1;i < 16;i++)
{
if (colmask[color] & (1 << i))
palette_used_colors[pal_base + 16 * color + i] = PALETTE_COLOR_USED;
}
}
if (palette_recalc())
{
memset (ch_dirtybuffer,1,speedbal_foreground_videoram_size / 2);
memset (bg_dirtybuffer,1,speedbal_background_videoram_size / 2);
}
}
// first background
speedbal_draw_background (bitmap_bg);
copybitmap (bitmap,bitmap_bg,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_NONE,0);
// second characters (general)
speedbal_draw_foreground1 (bitmap_ch);
copybitmap (bitmap,bitmap_ch,0,0,0,0,&Machine->drv->visible_area,TRANSPARENCY_PEN,palette_transparent_pen);
// thirth sprites
speedbal_draw_sprites (bitmap);
}