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/***************************************************************************
Irem Red Alert hardware
If you have any questions about how this driver works, don't hesitate to
ask. - Mike Balfour (mab22@po.cwru.edu)
****************************************************************************/
#include "driver.h"
#include "video/resnet.h"
#include "redalert.h"
#define NUM_CHARMAP_PENS 0x200
#define NUM_BITMAP_PENS 8
/*************************************
*
* Global variables
*
*************************************/
UINT8 *redalert_bitmap_videoram;
UINT8 *redalert_bitmap_color;
UINT8 *redalert_charmap_videoram;
UINT8 *redalert_video_control;
/*************************************
*
* Local variable
*
*************************************/
static UINT8 *redalert_bitmap_colorram;
static UINT8 redalert_control_xor;
/*************************************
*
* Bitmap videoram write handler
*
*************************************/
WRITE8_HANDLER( redalert_bitmap_videoram_w )
{
redalert_bitmap_videoram[offset ] = data;
redalert_bitmap_colorram[offset >> 3] = *redalert_bitmap_color & 0x07;
}
/*************************************
*
* Color generation
*
*************************************/
static void get_pens(running_machine *machine, pen_t *pens)
{
static const int resistances_bitmap[] = { 100 };
static const int resistances_charmap_rg[] = { 390, 220, 180 };
static const int resistances_charmap_b[] = { 220, 100 };
static const int resistances_back_r[] = { 1000 + 100 };
static const int resistances_back_gb[] = { 100 + 470 };
offs_t offs;
double scaler;
double bitmap_weight[1];
double charmap_rg_weights[3];
double charmap_b_weights[2];
double back_r_weight[1];
double back_gb_weight[1];
const UINT8 *prom = memory_region(machine, "proms");
scaler = compute_resistor_weights(0, 0xff, -1,
1, resistances_bitmap, bitmap_weight, 470, 0,
3, resistances_charmap_rg, charmap_rg_weights, 470, 0,
2, resistances_charmap_b, charmap_b_weights, 470, 0);
compute_resistor_weights(0, 0xff, scaler,
1, resistances_back_r, back_r_weight, 470, 0,
1, resistances_back_gb, back_gb_weight, 470, 0,
0, 0, 0, 0, 0);
/* the character layer colors come from the PROM */
for (offs = 0; offs < NUM_CHARMAP_PENS; offs++)
{
UINT8 data = prom[offs];
/* very strange mapping */
UINT8 r0_bit = (data >> 2) & 0x01;
UINT8 r1_bit = (data >> 6) & 0x01;
UINT8 r2_bit = (data >> 4) & 0x01;
UINT8 g0_bit = (data >> 1) & 0x01;
UINT8 g1_bit = (data >> 3) & 0x01;
UINT8 g2_bit = (data >> 5) & 0x01;
UINT8 b0_bit = (data >> 0) & 0x01;
UINT8 b1_bit = (data >> 7) & 0x01;
UINT8 r = combine_3_weights(charmap_rg_weights, r0_bit, r1_bit, r2_bit);
UINT8 g = combine_3_weights(charmap_rg_weights, g0_bit, g1_bit, g2_bit);
UINT8 b = combine_2_weights(charmap_b_weights, b0_bit, b1_bit);
pens[offs] = MAKE_RGB(r, g, b);
}
/* the bitmap layer colors are directly mapped */
for (offs = 0; offs < NUM_BITMAP_PENS; offs++)
{
UINT8 r_bit = (offs >> 2) & 0x01;
UINT8 g_bit = (offs >> 1) & 0x01;
UINT8 b_bit = (offs >> 0) & 0x01;
UINT8 r = bitmap_weight[r_bit];
UINT8 g = bitmap_weight[g_bit];
UINT8 b = bitmap_weight[b_bit];
pens[NUM_CHARMAP_PENS + offs] = MAKE_RGB(r, g, b);
}
/* background color */
pens[NUM_CHARMAP_PENS + NUM_BITMAP_PENS] = MAKE_RGB(back_r_weight[0], back_gb_weight[0], back_gb_weight[0]);
}
/*************************************
*
* Video hardware start
*
*************************************/
static VIDEO_START( redalert )
{
redalert_bitmap_colorram = auto_malloc(0x0400);
state_save_register_global_pointer(redalert_bitmap_colorram, 0x0400);
redalert_control_xor = 0x00;
}
static VIDEO_START( ww3 )
{
VIDEO_START_CALL( redalert );
redalert_control_xor = 0x04;
}
/*************************************
*
* Red Alert video update
*
*************************************/
static VIDEO_UPDATE( redalert )
{
pen_t pens[NUM_CHARMAP_PENS + NUM_BITMAP_PENS + 1];
offs_t offs;
get_pens(screen->machine, pens);
for (offs = 0; offs < 0x2000; offs++)
{
int i;
UINT8 charmap_data_1;
UINT8 charmap_data_2;
UINT8 y = offs & 0xff;
UINT8 x = (~offs >> 8) << 3;
UINT8 bitmap_data = redalert_bitmap_videoram[offs];
UINT8 bitmap_color = redalert_bitmap_colorram[offs >> 3];
UINT8 charmap_code = redalert_charmap_videoram[0x0000 | (offs >> 3)];
offs_t charmap_data_base = ((charmap_code & 0x7f) << 3) | (offs & 0x07);
/* D7 of the char code selects the char set to use */
if (charmap_code & 0x80)
{
charmap_data_1 = redalert_charmap_videoram[0x0400 | charmap_data_base];
charmap_data_2 = redalert_charmap_videoram[0x0c00 | charmap_data_base];
}
else
{
charmap_data_1 = 0; /* effectively disables A0 of the color PROM */
charmap_data_2 = redalert_charmap_videoram[0x0800 | charmap_data_base];
}
for (i = 0; i < 8; i++)
{
pen_t pen;
int bitmap_bit = bitmap_data & 0x80;
UINT8 color_prom_a0_a1 = ((charmap_data_2 & 0x80) >> 6) | ((charmap_data_1 & 0x80) >> 7);
/* determine priority */
if ((color_prom_a0_a1 == 0) || (bitmap_bit && ((charmap_code & 0xc0) == 0xc0)))
pen = bitmap_bit ? pens[NUM_CHARMAP_PENS + bitmap_color] : pens[NUM_CHARMAP_PENS + NUM_BITMAP_PENS];
else
pen = pens[((charmap_code & 0xfe) << 1) | color_prom_a0_a1];
if ((*redalert_video_control ^ redalert_control_xor) & 0x04)
*BITMAP_ADDR32(bitmap, y, x) = pen;
else
*BITMAP_ADDR32(bitmap, y ^ 0xff, x ^ 0xff) = pen;
/* next pixel */
x = x + 1;
bitmap_data = bitmap_data << 1;
charmap_data_1 = charmap_data_1 << 1;
charmap_data_2 = charmap_data_2 << 1;
}
}
return 0;
}
/*************************************
*
* Demoneye-X video update
*
*************************************/
static VIDEO_UPDATE( demoneye )
{
pen_t pens[NUM_CHARMAP_PENS + NUM_BITMAP_PENS + 1];
offs_t offs;
get_pens(screen->machine, pens);
for (offs = 0; offs < 0x2000; offs++)
{
int i;
UINT8 charmap_data_1;
UINT8 charmap_data_2;
UINT8 y = offs & 0xff;
UINT8 x = (~offs >> 8) << 3;
UINT8 bitmap_data = redalert_bitmap_videoram[offs];
UINT8 bitmap_color = redalert_bitmap_colorram[offs >> 3];
UINT8 charmap_code = redalert_charmap_videoram[0x1000 | (offs >> 3)];
offs_t charmap_data_base = ((charmap_code & 0x7f) << 3) | (offs & 0x07);
/* D7 of the char code selects the char set to use */
if (charmap_code & 0x80)
{
charmap_data_1 = redalert_charmap_videoram[0x0400 | charmap_data_base];
charmap_data_2 = redalert_charmap_videoram[0x0c00 | charmap_data_base];
}
else
{
charmap_data_1 = redalert_charmap_videoram[0x0000 | charmap_data_base];
charmap_data_2 = redalert_charmap_videoram[0x0800 | charmap_data_base];
}
/* this is the mapping of the 3rd char set */
//charmap_data_1 = redalert_charmap_videoram[0x1400 | charmap_data_base];
//charmap_data_2 = redalert_charmap_videoram[0x1c00 | charmap_data_base];
for (i = 0; i < 8; i++)
{
pen_t pen;
int bitmap_bit = bitmap_data & 0x80;
UINT8 color_prom_a0_a1 = ((charmap_data_2 & 0x80) >> 6) | ((charmap_data_1 & 0x80) >> 7);
/* determine priority */
if ((color_prom_a0_a1 == 0) || (bitmap_bit && ((charmap_code & 0xc0) == 0xc0)))
pen = bitmap_bit ? pens[NUM_CHARMAP_PENS + bitmap_color] : pens[NUM_CHARMAP_PENS + NUM_BITMAP_PENS];
else
pen = pens[((charmap_code & 0xfe) << 1) | color_prom_a0_a1];
if (*redalert_video_control & 0x04)
*BITMAP_ADDR32(bitmap, y ^ 0xff, x ^ 0xff) = pen;
else
*BITMAP_ADDR32(bitmap, y, x) = pen;
/* next pixel */
x = x + 1;
bitmap_data = bitmap_data << 1;
charmap_data_1 = charmap_data_1 << 1;
charmap_data_2 = charmap_data_2 << 1;
}
}
return 0;
}
/*************************************
*
* Red Alert machine driver
*
*************************************/
static MACHINE_DRIVER_START( redalert_video_common )
MDRV_VIDEO_UPDATE(redalert)
MDRV_SCREEN_ADD("main", RASTER)
MDRV_SCREEN_FORMAT(BITMAP_FORMAT_RGB32)
MDRV_SCREEN_REFRESH_RATE(60)
MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
MDRV_SCREEN_SIZE(32*8, 32*8)
MDRV_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 1*8, 31*8-1)
MACHINE_DRIVER_END
MACHINE_DRIVER_START( redalert_video )
MDRV_VIDEO_START(redalert)
MDRV_IMPORT_FROM( redalert_video_common )
MACHINE_DRIVER_END
MACHINE_DRIVER_START( ww3_video )
MDRV_VIDEO_START( ww3 )
MDRV_IMPORT_FROM( redalert_video_common )
MACHINE_DRIVER_END
/*************************************
*
* Demoneye-X machine driver
*
*************************************/
MACHINE_DRIVER_START( demoneye_video )
MDRV_VIDEO_START(redalert)
MDRV_VIDEO_UPDATE(demoneye)
MDRV_SCREEN_ADD("main", RASTER)
MDRV_SCREEN_FORMAT(BITMAP_FORMAT_RGB32)
MDRV_SCREEN_REFRESH_RATE(60)
MDRV_SCREEN_VBLANK_TIME(ATTOSECONDS_IN_USEC(0))
MDRV_SCREEN_SIZE(32*8, 32*8)
MDRV_SCREEN_VISIBLE_AREA(0*8, 32*8-1, 1*8, 31*8-1)
MACHINE_DRIVER_END
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