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AmigActive 10
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vidhrdw
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crimfght.c
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C/C++ Source or Header
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2000-01-10
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3KB
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113 lines
#include "driver.h"
#include "vidhrdw/generic.h"
#include "vidhrdw/konamiic.h"
static int layer_colorbase[3],sprite_colorbase;
/***************************************************************************
Callbacks for the K052109
***************************************************************************/
static void tile_callback(int layer,int bank,int *code,int *color)
{
tile_info.flags = (*color & 0x20) ? TILE_FLIPX : 0;
*code |= ((*color & 0x1f) << 8) | (bank << 13);
*color = layer_colorbase[layer] + ((*color & 0xc0) >> 6);
}
/***************************************************************************
Callbacks for the K051960
***************************************************************************/
static void sprite_callback(int *code,int *color,int *priority)
{
/* Weird priority scheme. Why use three bits when two would suffice? */
/* The PROM allows for mixed priorities, where sprites would have */
/* priority over text but not on one or both of the other two planes. */
/* Luckily, this isn't used by the game. */
switch (*color & 0x70)
{
case 0x10: *priority = 0; break;
case 0x00: *priority = 1; break;
case 0x40: *priority = 2; break;
case 0x20: *priority = 3; break;
/* 0x60 == 0x20 */
/* 0x50 priority over F and A, but not over B */
/* 0x30 priority over F, but not over A and B */
/* 0x70 == 0x30 */
}
/* bit 7 is on in the "Game Over" sprites, meaning unknown */
/* in Aliens it is the top bit of the code, but that's not needed here */
*color = sprite_colorbase + (*color & 0x0f);
}
/***************************************************************************
Start the video hardware emulation.
***************************************************************************/
void crimfght_vh_stop( void )
{
free(paletteram);
K052109_vh_stop();
K051960_vh_stop();
}
int crimfght_vh_start( void )
{
paletteram = malloc(0x400);
if (!paletteram) return 1;
layer_colorbase[0] = 0;
layer_colorbase[1] = 4;
layer_colorbase[2] = 8;
sprite_colorbase = 16;
if (K052109_vh_start(REGION_GFX1,NORMAL_PLANE_ORDER,tile_callback))
{
free(paletteram);
return 1;
}
if (K051960_vh_start(REGION_GFX2,NORMAL_PLANE_ORDER,sprite_callback))
{
free(paletteram);
K052109_vh_stop();
return 1;
}
return 0;
}
/***************************************************************************
Display refresh
***************************************************************************/
void crimfght_vh_screenrefresh(struct osd_bitmap *bitmap,int full_refresh)
{
K052109_tilemap_update();
palette_init_used_colors();
K051960_mark_sprites_colors();
if (palette_recalc())
tilemap_mark_all_pixels_dirty(ALL_TILEMAPS);
tilemap_render(ALL_TILEMAPS);
K052109_tilemap_draw(bitmap,1,TILEMAP_IGNORE_TRANSPARENCY);
K051960_sprites_draw(bitmap,2,2);
K052109_tilemap_draw(bitmap,2,0);
K051960_sprites_draw(bitmap,1,1);
K052109_tilemap_draw(bitmap,0,0);
K051960_sprites_draw(bitmap,0,0);
}