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AmigActive 10
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vidhrdw
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rockrage.c
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C/C++ Source or Header
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2000-04-04
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3KB
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114 lines
#include "driver.h"
#include "vidhrdw/generic.h"
#include "vidhrdw/konamiic.h"
static int layer_colorbase[2];
static int rockrage_vreg;
void rockrage_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])
/* build the lookup table for sprites. Palette is dynamic. */
for (i = 0;i < TOTAL_COLORS(0)/2; i++){
COLOR(0,i) = 0x00 + (color_prom[i] & 0x0f);
COLOR(0,(TOTAL_COLORS(0)/2)+i) = 0x10 + (color_prom[0x100+i] & 0x0f);
}
}
/***************************************************************************
Callback for the K007342
***************************************************************************/
static void tile_callback(int layer, int bank, int *code, int *color)
{
if (layer == 1)
*code |= ((*color & 0x40) << 2) | ((bank & 0x01) << 9);
else
*code |= ((*color & 0x40) << 2) | ((bank & 0x03) << 10) | ((rockrage_vreg & 0x04) << 7) | ((rockrage_vreg & 0x08) << 9);
*color = layer_colorbase[layer] + (*color & 0x0f);
}
/***************************************************************************
Callback for the K007420
***************************************************************************/
static void sprite_callback(int *code,int *color)
{
*code |= ((*color & 0x40) << 2) | ((*color & 0x80) << 1)*(rockrage_vreg << 1);
*code = (*code << 2) | ((*color & 0x30) >> 4);
*color = 0;
}
WRITE_HANDLER( rockrage_vreg_w ){
/* bits 4-7: unused */
/* bit 3: bit 4 of bank # (layer 0) */
/* bit 2: bit 1 of bank # (layer 0) */
/* bits 0-1: sprite bank select */
if ((data & 0x0c) != (rockrage_vreg & 0x0c))
tilemap_mark_all_tiles_dirty(ALL_TILEMAPS);
rockrage_vreg = data;
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
int rockrage_vh_start(void)
{
layer_colorbase[0] = 0x00;
layer_colorbase[1] = 0x10;
if (K007342_vh_start(0,tile_callback))
{
return 1;
}
if (K007420_vh_start(1,sprite_callback))
{
K007420_vh_stop();
return 1;
}
return 0;
}
void rockrage_vh_stop(void)
{
K007342_vh_stop();
K007420_vh_stop();
}
/***************************************************************************
Screen Refresh
***************************************************************************/
void rockrage_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
K007342_tilemap_update();
if (palette_recalc())
tilemap_mark_all_pixels_dirty(ALL_TILEMAPS);
tilemap_render( ALL_TILEMAPS );
K007342_tilemap_draw( bitmap, 0, TILEMAP_IGNORE_TRANSPARENCY );
K007420_sprites_draw( bitmap );
K007342_tilemap_draw( bitmap, 0, 1 | TILEMAP_IGNORE_TRANSPARENCY );
K007342_tilemap_draw( bitmap, 1, 0 );
K007342_tilemap_draw( bitmap, 1, 1 );
}