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vidhrdw
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cbuster.c
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C/C++ Source or Header
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2000-04-04
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14KB
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523 lines
/***************************************************************************
Crude Buster Video emulation - Bryan McPhail, mish@tendril.co.uk
***************************************************************************/
#include "driver.h"
#include "vidhrdw/generic.h"
unsigned char *twocrude_pf1_data,*twocrude_pf2_data,*twocrude_pf3_data,*twocrude_pf4_data;
static struct tilemap *pf1_tilemap,*pf2_tilemap,*pf3_tilemap,*pf4_tilemap;
static unsigned char *gfx_base;
static int gfx_bank,twocrude_pri,flipscreen,last_flip;
static unsigned char twocrude_control_0[16];
static unsigned char twocrude_control_1[16];
unsigned char *twocrude_pf1_rowscroll,*twocrude_pf2_rowscroll;
unsigned char *twocrude_pf3_rowscroll,*twocrude_pf4_rowscroll;
static unsigned char *twocrude_spriteram;
/* Function for all 16x16 1024 by 512 layers */
static UINT32 back_scan(UINT32 col,UINT32 row,UINT32 num_cols,UINT32 num_rows)
{
/* logical (col,row) -> memory offset */
return (col & 0x1f) + ((row & 0x1f) << 5) + ((col & 0x20) << 5);
}
static void get_back_tile_info(int tile_index)
{
int tile,color;
tile=READ_WORD(&gfx_base[2*tile_index]);
color=tile >> 12;
tile=tile&0xfff;
SET_TILE_INFO(gfx_bank,tile,color)
}
/* 8x8 top layer */
static void get_fore_tile_info(int tile_index)
{
int tile=READ_WORD(&twocrude_pf1_data[2*tile_index]);
int color=tile >> 12;
tile=tile&0xfff;
SET_TILE_INFO(0,tile,color)
}
/******************************************************************************/
void twocrude_vh_stop (void)
{
free(twocrude_spriteram);
}
int twocrude_vh_start(void)
{
pf2_tilemap = tilemap_create(get_back_tile_info,back_scan, TILEMAP_OPAQUE,16,16,64,32);
pf3_tilemap = tilemap_create(get_back_tile_info,back_scan, TILEMAP_TRANSPARENT,16,16,64,32);
pf4_tilemap = tilemap_create(get_back_tile_info,back_scan, TILEMAP_TRANSPARENT,16,16,64,32);
pf1_tilemap = tilemap_create(get_fore_tile_info,tilemap_scan_rows,TILEMAP_TRANSPARENT,8,8,64,32);
if (!pf1_tilemap || !pf2_tilemap || !pf3_tilemap || !pf4_tilemap)
return 1;
pf1_tilemap->transparent_pen = 0;
pf3_tilemap->transparent_pen = 0;
pf4_tilemap->transparent_pen = 0;
twocrude_spriteram = malloc(0x800);
return 0;
}
/******************************************************************************/
WRITE_HANDLER( twocrude_update_sprites_w )
{
memcpy(twocrude_spriteram,spriteram,0x800);
}
static void update_24bitcol(int offset)
{
int r,g,b;
r = (READ_WORD(&paletteram[offset]) >> 0) & 0xff;
g = (READ_WORD(&paletteram[offset]) >> 8) & 0xff;
b = (READ_WORD(&paletteram_2[offset]) >> 0) & 0xff;
palette_change_color(offset / 2,r,g,b);
}
WRITE_HANDLER( twocrude_palette_24bit_rg_w )
{
COMBINE_WORD_MEM(&paletteram[offset],data);
update_24bitcol(offset);
}
WRITE_HANDLER( twocrude_palette_24bit_b_w )
{
COMBINE_WORD_MEM(&paletteram_2[offset],data);
update_24bitcol(offset);
}
READ_HANDLER( twocrude_palette_24bit_rg_r )
{
return READ_WORD(&paletteram[offset]);
}
READ_HANDLER( twocrude_palette_24bit_b_r )
{
return READ_WORD(&paletteram_2[offset]);
}
/******************************************************************************/
void twocrude_pri_w(int pri)
{
twocrude_pri=pri;
}
WRITE_HANDLER( twocrude_pf1_data_w )
{
int oldword = READ_WORD(&twocrude_pf1_data[offset]);
int newword = COMBINE_WORD(oldword,data);
if (oldword != newword)
{
WRITE_WORD(&twocrude_pf1_data[offset],newword);
tilemap_mark_tile_dirty(pf1_tilemap,offset/2);
}
}
WRITE_HANDLER( twocrude_pf2_data_w )
{
int oldword = READ_WORD(&twocrude_pf2_data[offset]);
int newword = COMBINE_WORD(oldword,data);
if (oldword != newword)
{
WRITE_WORD(&twocrude_pf2_data[offset],newword);
tilemap_mark_tile_dirty(pf2_tilemap,offset/2);
}
}
WRITE_HANDLER( twocrude_pf3_data_w )
{
int oldword = READ_WORD(&twocrude_pf3_data[offset]);
int newword = COMBINE_WORD(oldword,data);
if (oldword != newword)
{
WRITE_WORD(&twocrude_pf3_data[offset],newword);
tilemap_mark_tile_dirty(pf3_tilemap,offset/2);
}
}
WRITE_HANDLER( twocrude_pf4_data_w )
{
int oldword = READ_WORD(&twocrude_pf4_data[offset]);
int newword = COMBINE_WORD(oldword,data);
if (oldword != newword)
{
WRITE_WORD(&twocrude_pf4_data[offset],newword);
tilemap_mark_tile_dirty(pf4_tilemap,offset/2);
}
}
WRITE_HANDLER( twocrude_control_0_w )
{
COMBINE_WORD_MEM(&twocrude_control_0[offset],data);
}
WRITE_HANDLER( twocrude_control_1_w )
{
COMBINE_WORD_MEM(&twocrude_control_1[offset],data);
}
WRITE_HANDLER( twocrude_pf1_rowscroll_w )
{
COMBINE_WORD_MEM(&twocrude_pf1_rowscroll[offset],data);
}
WRITE_HANDLER( twocrude_pf2_rowscroll_w )
{
COMBINE_WORD_MEM(&twocrude_pf2_rowscroll[offset],data);
}
WRITE_HANDLER( twocrude_pf3_rowscroll_w )
{
COMBINE_WORD_MEM(&twocrude_pf3_rowscroll[offset],data);
}
WRITE_HANDLER( twocrude_pf4_rowscroll_w )
{
COMBINE_WORD_MEM(&twocrude_pf4_rowscroll[offset],data);
}
/******************************************************************************/
static void twocrude_update_palette(void)
{
int offs,color,i,pal_base;
int colmask[32];
palette_init_used_colors();
/* Sprites */
pal_base = Machine->drv->gfxdecodeinfo[4].color_codes_start;
for (color = 0;color < 32;color++) colmask[color] = 0;
for (offs = 0;offs < 0x800;offs += 8)
{
int x,y,sprite,multi;
sprite = READ_WORD (&twocrude_spriteram[offs+2]) & 0x7fff;
if (!sprite) continue;
y = READ_WORD(&twocrude_spriteram[offs]);
x = READ_WORD(&twocrude_spriteram[offs+4]);
color = (x >> 9) &0x1f;
multi = (1 << ((y & 0x0600) >> 9)) - 1; /* 1x, 2x, 4x, 8x height */
sprite &= ~multi;
while (multi >= 0)
{
colmask[color] |= Machine->gfx[4]->pen_usage[sprite + multi];
multi--;
}
}
for (color = 0;color < 16;color++)
{
for (i = 1;i < 16;i++)
{
if (colmask[color] & (1 << i))
palette_used_colors[pal_base + 16 * color + i] = PALETTE_COLOR_USED;
}
}
for (color = 16;color < 32;color++)
{
for (i = 1;i < 16;i++)
{
if (colmask[color] & (1 << i))
palette_used_colors[256 + 1024 + 16 * (color-16) + i] = PALETTE_COLOR_USED;
}
}
if (palette_recalc())
tilemap_mark_all_pixels_dirty(ALL_TILEMAPS);
}
static void twocrude_drawsprites(struct osd_bitmap *bitmap, int pri)
{
int offs;
for (offs = 0;offs < 0x800;offs += 8)
{
int x,y,sprite,colour,multi,fx,fy,inc,flash,mult;
sprite = READ_WORD (&twocrude_spriteram[offs+2]) & 0x7fff;
if (!sprite) continue;
y = READ_WORD(&twocrude_spriteram[offs]);
x = READ_WORD(&twocrude_spriteram[offs+4]);
if ((y&0x8000) && pri==1) continue;
if (!(y&0x8000) && pri==0) continue;
colour = (x >> 9) &0xf;
if (x&0x2000) colour+=64;
flash=y&0x1000;
if (flash && (cpu_getcurrentframe() & 1)) continue;
fx = y & 0x2000;
fy = y & 0x4000;
multi = (1 << ((y & 0x0600) >> 9)) - 1; /* 1x, 2x, 4x, 8x height */
x = x & 0x01ff;
y = y & 0x01ff;
if (x >= 256) x -= 512;
if (y >= 256) y -= 512;
x = 240 - x;
y = 240 - y;
if (x>256) continue; /* Speedup */
sprite &= ~multi;
if (fy)
inc = -1;
else
{
sprite += multi;
inc = 1;
}
if (flipscreen) {
y=240-y;
x=240-x;
if (fx) fx=0; else fx=1;
if (fy) fy=0; else fy=1;
mult=16;
}
else mult=-16;
while (multi >= 0)
{
drawgfx(bitmap,Machine->gfx[4],
sprite - multi * inc,
colour,
fx,fy,
x,y + mult * multi,
&Machine->drv->visible_area,TRANSPARENCY_PEN,0);
multi--;
}
}
}
/******************************************************************************/
void twocrude_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
int offs;
int pf23_control,pf14_control;
/* Update flipscreen */
if (READ_WORD(&twocrude_control_1[0])&0x80)
flipscreen=0;
else
flipscreen=1;
if (last_flip!=flipscreen)
tilemap_set_flip(ALL_TILEMAPS,flipscreen ? (TILEMAP_FLIPY | TILEMAP_FLIPX) : 0);
last_flip=flipscreen;
pf23_control=READ_WORD (&twocrude_control_0[0xc]);
pf14_control=READ_WORD (&twocrude_control_1[0xc]);
/* Background - Rowscroll enable */
if (pf23_control&0x4000) {
int scrollx=READ_WORD(&twocrude_control_0[6]),rows;
tilemap_set_scroll_cols(pf2_tilemap,1);
tilemap_set_scrolly( pf2_tilemap,0, READ_WORD(&twocrude_control_0[8]) );
/* Several different rowscroll styles! */
switch ((READ_WORD (&twocrude_control_0[0xa])>>11)&7) {
case 0: rows=512; break;/* Every line of 512 height bitmap */
case 1: rows=256; break;
case 2: rows=128; break;
case 3: rows=64; break;
case 4: rows=32; break;
case 5: rows=16; break;
case 6: rows=8; break;
case 7: rows=4; break;
default: rows=1; break;
}
tilemap_set_scroll_rows(pf2_tilemap,rows);
for (offs = 0;offs < rows;offs++)
tilemap_set_scrollx( pf2_tilemap,offs, scrollx + READ_WORD(&twocrude_pf2_rowscroll[2*offs]) );
}
else {
tilemap_set_scroll_rows(pf2_tilemap,1);
tilemap_set_scroll_cols(pf2_tilemap,1);
tilemap_set_scrollx( pf2_tilemap,0, READ_WORD(&twocrude_control_0[6]) );
tilemap_set_scrolly( pf2_tilemap,0, READ_WORD(&twocrude_control_0[8]) );
}
/* Playfield 3 */
if (pf23_control&0x40) { /* Rowscroll */
int scrollx=READ_WORD(&twocrude_control_0[2]),rows;
tilemap_set_scroll_cols(pf3_tilemap,1);
tilemap_set_scrolly( pf3_tilemap,0, READ_WORD(&twocrude_control_0[4]) );
/* Several different rowscroll styles! */
switch ((READ_WORD (&twocrude_control_0[0xa])>>3)&7) {
case 0: rows=512; break;/* Every line of 512 height bitmap */
case 1: rows=256; break;
case 2: rows=128; break;
case 3: rows=64; break;
case 4: rows=32; break;
case 5: rows=16; break;
case 6: rows=8; break;
case 7: rows=4; break;
default: rows=1; break;
}
tilemap_set_scroll_rows(pf3_tilemap,rows);
for (offs = 0;offs < rows;offs++)
tilemap_set_scrollx( pf3_tilemap,offs, scrollx + READ_WORD(&twocrude_pf3_rowscroll[2*offs]) );
}
else if (pf23_control&0x20) { /* Colscroll */
int scrolly=READ_WORD(&twocrude_control_0[4]),cols;
tilemap_set_scroll_rows(pf3_tilemap,1);
tilemap_set_scrollx( pf3_tilemap,0, READ_WORD(&twocrude_control_0[2]) );
/* Several different colscroll styles! */
switch ((READ_WORD (&twocrude_control_0[0xa])>>0)&7) {
case 0: cols=64; break;
case 1: cols=32; break;
case 2: cols=16; break;
case 3: cols=8; break;
case 4: cols=4; break;
case 5: cols=2; break;
case 6: cols=1; break;
case 7: cols=1; break;
default: cols=1; break;
}
tilemap_set_scroll_cols(pf3_tilemap,cols);
for (offs = 0;offs < cols;offs++)
tilemap_set_scrolly( pf3_tilemap,offs,scrolly + READ_WORD(&twocrude_pf3_rowscroll[2*offs+0x400]) );
}
else {
tilemap_set_scroll_rows(pf3_tilemap,1);
tilemap_set_scroll_cols(pf3_tilemap,1);
tilemap_set_scrollx( pf3_tilemap,0, READ_WORD(&twocrude_control_0[2]) );
tilemap_set_scrolly( pf3_tilemap,0, READ_WORD(&twocrude_control_0[4]) );
}
/* Playfield 4 - Rowscroll enable */
if (pf14_control&0x4000) {
int scrollx=READ_WORD(&twocrude_control_1[6]),rows;
tilemap_set_scroll_cols(pf4_tilemap,1);
tilemap_set_scrolly( pf4_tilemap,0, READ_WORD(&twocrude_control_1[8]) );
/* Several different rowscroll styles! */
switch ((READ_WORD (&twocrude_control_1[0xa])>>11)&7) {
case 0: rows=512; break;/* Every line of 512 height bitmap */
case 1: rows=256; break;
case 2: rows=128; break;
case 3: rows=64; break;
case 4: rows=32; break;
case 5: rows=16; break;
case 6: rows=8; break;
case 7: rows=4; break;
default: rows=1; break;
}
tilemap_set_scroll_rows(pf4_tilemap,rows);
for (offs = 0;offs < rows;offs++)
tilemap_set_scrollx( pf4_tilemap,offs, scrollx + READ_WORD(&twocrude_pf4_rowscroll[2*offs]) );
}
else {
tilemap_set_scroll_rows(pf4_tilemap,1);
tilemap_set_scroll_cols(pf4_tilemap,1);
tilemap_set_scrollx( pf4_tilemap,0, READ_WORD(&twocrude_control_1[6]) );
tilemap_set_scrolly( pf4_tilemap,0, READ_WORD(&twocrude_control_1[8]) );
}
/* Playfield 1 */
if (pf14_control&0x40) { /* Rowscroll */
int scrollx=READ_WORD(&twocrude_control_1[2]),rows;
tilemap_set_scroll_cols(pf1_tilemap,1);
tilemap_set_scrolly( pf1_tilemap,0, READ_WORD(&twocrude_control_1[4]) );
/* Several different rowscroll styles! */
switch ((READ_WORD (&twocrude_control_1[0xa])>>3)&7) {
case 0: rows=256; break;/* Every line of 256 height bitmap */
case 1: rows=128; break;
case 2: rows=64; break;
case 3: rows=32; break;
case 4: rows=16; break;
case 5: rows=8; break;
case 6: rows=4; break;
case 7: rows=2; break;
default: rows=1; break;
}
tilemap_set_scroll_rows(pf1_tilemap,rows);
for (offs = 0;offs < rows;offs++)
tilemap_set_scrollx( pf1_tilemap,offs, scrollx + READ_WORD(&twocrude_pf1_rowscroll[2*offs]) );
}
else {
tilemap_set_scroll_rows(pf1_tilemap,1);
tilemap_set_scroll_cols(pf1_tilemap,1);
tilemap_set_scrollx( pf1_tilemap,0, READ_WORD(&twocrude_control_1[2]) );
tilemap_set_scrolly( pf1_tilemap,0, READ_WORD(&twocrude_control_1[4]) );
}
/* Update playfields */
gfx_bank=1;
gfx_base=twocrude_pf2_data;
tilemap_update(pf2_tilemap);
gfx_bank=2;
gfx_base=twocrude_pf3_data;
tilemap_update(pf3_tilemap);
gfx_bank=3;
gfx_base=twocrude_pf4_data;
tilemap_update(pf4_tilemap);
tilemap_update(pf1_tilemap);
twocrude_update_palette();
/* Draw playfields & sprites */
tilemap_render(ALL_TILEMAPS);
tilemap_draw(bitmap,pf2_tilemap,0);
twocrude_drawsprites(bitmap,0);
if (twocrude_pri) {
tilemap_draw(bitmap,pf4_tilemap,0);
tilemap_draw(bitmap,pf3_tilemap,0);
}
else {
tilemap_draw(bitmap,pf3_tilemap,0);
tilemap_draw(bitmap,pf4_tilemap,0);
}
twocrude_drawsprites(bitmap,1);
tilemap_draw(bitmap,pf1_tilemap,0);
}