#include "emu.h"
#include "video/resnet.h"
#include "includes/champbas.h"
/***************************************************************************
Convert the color PROMs into a more useable format.
The palette PROM is connected to the RGB output this way:
bit 7 -- 220 ohm resistor -- BLUE
-- 470 ohm resistor -- BLUE
-- 220 ohm resistor -- GREEN
-- 470 ohm resistor -- GREEN
-- 1 kohm resistor -- GREEN
-- 220 ohm resistor -- RED
-- 470 ohm resistor -- RED
bit 0 -- 1 kohm resistor -- RED
***************************************************************************/
PALETTE_INIT( champbas )
{
static const int resistances_rg[3] = { 1000, 470, 220 };
static const int resistances_b [2] = { 470, 220 };
double rweights[3], gweights[3], bweights[2];
int i;
/* compute the color output resistor weights */
compute_resistor_weights(0, 255, -1.0,
3, &resistances_rg[0], rweights, 0, 0,
3, &resistances_rg[0], gweights, 0, 0,
2, &resistances_b[0], bweights, 0, 0);
/* allocate the colortable */
machine.colortable = colortable_alloc(machine, 0x20);
/* create a lookup table for the palette */
for (i = 0; i < 0x20; i++)
{
int bit0, bit1, bit2;
int r, g, b;
/* red component */
bit0 = (color_prom[i] >> 0) & 0x01;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
r = combine_3_weights(rweights, bit0, bit1, bit2);
/* green component */
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
g = combine_3_weights(gweights, bit0, bit1, bit2);
/* blue component */
bit0 = (color_prom[i] >> 6) & 0x01;
bit1 = (color_prom[i] >> 7) & 0x01;
b = combine_2_weights(bweights, bit0, bit1);
colortable_palette_set_color(machine.colortable, i, MAKE_RGB(r, g, b));
}
color_prom += 0x20;
for (i = 0; i < 0x200; i++)
{
UINT8 ctabentry = (color_prom[i & 0xff] & 0x0f) | ((i & 0x100) >> 4);
colortable_entry_set_value(machine.colortable, i, ctabentry);
}
}
PALETTE_INIT( exctsccr )
{
int i;
/* allocate the colortable */
machine.colortable = colortable_alloc(machine, 0x20);
/* create a lookup table for the palette */
for (i = 0; i < 0x20; i++)
{
int bit0, bit1, bit2;
int r, g, b;
/* red component */
bit0 = (color_prom[i] >> 0) & 0x01;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
r = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* green component */
bit0 = (color_prom[i] >> 3) & 0x01;
bit1 = (color_prom[i] >> 4) & 0x01;
bit2 = (color_prom[i] >> 5) & 0x01;
g = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
/* blue component */
bit0 = 0;
bit1 = (color_prom[i] >> 6) & 0x01;
bit2 = (color_prom[i] >> 7) & 0x01;
b = 0x21 * bit0 + 0x47 * bit1 + 0x97 * bit2;
colortable_palette_set_color(machine.colortable, i, MAKE_RGB(r, g, b));
}
/* color_prom now points to the beginning of the lookup table */
color_prom += 0x20;
/* characters / sprites (3bpp) */
for (i = 0; i < 0x100; i++)
{
int swapped_i = BITSWAP8(i, 2, 7, 6, 5, 4, 3, 1, 0);
UINT8 ctabentry = (color_prom[swapped_i] & 0x0f) | ((i & 0x80) >> 3);
colortable_entry_set_value(machine.colortable, i, ctabentry);
}
/* sprites (4bpp) */
for (i = 0; i < 0x100; i++)
{
UINT8 ctabentry = (color_prom[0x100 + i] & 0x0f) | 0x10;
colortable_entry_set_value(machine.colortable, i + 0x100, ctabentry);
}
}
static TILE_GET_INFO( champbas_get_bg_tile_info )
{
champbas_state *state = machine.driver_data<champbas_state>();
int code = state->m_bg_videoram[tile_index] | (state->m_gfx_bank << 8);
int color = (state->m_bg_videoram[tile_index + 0x400] & 0x1f) | 0x20;
SET_TILE_INFO(0, code, color, 0);
}
static TILE_GET_INFO( exctsccr_get_bg_tile_info )
{
champbas_state *state = machine.driver_data<champbas_state>();
int code = state->m_bg_videoram[tile_index] | (state->m_gfx_bank << 8);
int color = state->m_bg_videoram[tile_index + 0x400] & 0x0f;
SET_TILE_INFO(0, code, color, 0);
}
VIDEO_START( champbas )
{
champbas_state *state = machine.driver_data<champbas_state>();
state->m_bg_tilemap = tilemap_create(machine, champbas_get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
}
VIDEO_START( exctsccr )
{
champbas_state *state = machine.driver_data<champbas_state>();
state->m_bg_tilemap = tilemap_create(machine, exctsccr_get_bg_tile_info, tilemap_scan_rows, 8, 8, 32, 32);
}
WRITE8_HANDLER( champbas_bg_videoram_w )
{
champbas_state *state = space->machine().driver_data<champbas_state>();
state->m_bg_videoram[offset] = data;
tilemap_mark_tile_dirty(state->m_bg_tilemap, offset & 0x3ff);
}
WRITE8_HANDLER( champbas_gfxbank_w )
{
champbas_state *state = space->machine().driver_data<champbas_state>();
data &= 1;
if (state->m_gfx_bank != data)
{
state->m_gfx_bank = data;
tilemap_mark_all_tiles_dirty(state->m_bg_tilemap);
}
}
WRITE8_HANDLER( champbas_palette_bank_w )
{
champbas_state *state = space->machine().driver_data<champbas_state>();
state->m_palette_bank = data & 1;
tilemap_set_palette_offset(state->m_bg_tilemap, state->m_palette_bank << 8);
}
WRITE8_HANDLER( champbas_flipscreen_w )
{
flip_screen_set(space->machine(), ~data & 1);
}
static void champbas_draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
champbas_state *state = machine.driver_data<champbas_state>();
int offs;
const gfx_element* const gfx = machine.gfx[1];
for (offs = state->m_spriteram_size - 2; offs >= 0; offs -= 2)
{
int code = (state->m_spriteram[offs] >> 2) | (state->m_gfx_bank << 6);
int color = (state->m_spriteram[offs + 1] & 0x1f) | (state->m_palette_bank << 6);
int flipx = ~state->m_spriteram[offs] & 0x01;
int flipy = ~state->m_spriteram[offs] & 0x02;
int sx = state->m_spriteram_2[offs + 1] - 16;
int sy = 255 - state->m_spriteram_2[offs];
drawgfx_transmask(bitmap, cliprect,
gfx,
code, color,
flipx, flipy,
sx, sy,
colortable_get_transpen_mask(machine.colortable, gfx, color, 0));
// wraparound
drawgfx_transmask(bitmap, cliprect,
gfx,
code, color,
flipx, flipy,
sx + 256, sy,
colortable_get_transpen_mask(machine.colortable, gfx, color, 0));
}
}
static void exctsccr_draw_sprites( running_machine &machine, bitmap_t *bitmap, const rectangle *cliprect )
{
champbas_state *state = machine.driver_data<champbas_state>();
int offs;
UINT8 *obj1, *obj2;
obj1 = state->m_bg_videoram;
obj2 = &(state->m_spriteram[0x20]);
for (offs = 0x0e; offs >= 0; offs -= 2)
{
int sx, sy, code, bank, flipx, flipy, color;
sx = obj2[offs + 1] - 16;
sy = 255 - obj2[offs];
code = (obj1[offs] >> 2) & 0x3f;
flipx = (~obj1[offs]) & 0x01;
flipy = (~obj1[offs]) & 0x02;
color = (obj1[offs + 1]) & 0x0f;
bank = ((obj1[offs + 1] >> 4) & 1);
drawgfx_transpen(bitmap,cliprect,
machine.gfx[1],
code + (bank << 6),
color,
flipx, flipy,
sx,sy,0);
}
obj1 = state->m_spriteram_2;
obj2 = state->m_spriteram;
for (offs = 0x0e; offs >= 0; offs -= 2)
{
int sx, sy, code, flipx, flipy, color;
sx = obj2[offs + 1] - 16;
sy = 255 - obj2[offs];
code = (obj1[offs] >> 2) & 0x3f;
flipx = (~obj1[offs]) & 0x01;
flipy = (~obj1[offs]) & 0x02;
color = (obj1[offs + 1]) & 0x0f;
drawgfx_transmask(bitmap,cliprect,
machine.gfx[2],
code,
color,
flipx, flipy,
sx,sy,
colortable_get_transpen_mask(machine.colortable, machine.gfx[2], color, 0x10));
}
}
SCREEN_UPDATE( champbas )
{
champbas_state *state = screen->machine().driver_data<champbas_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
champbas_draw_sprites(screen->machine(), bitmap, cliprect);
return 0;
}
SCREEN_UPDATE( exctsccr )
{
champbas_state *state = screen->machine().driver_data<champbas_state>();
tilemap_draw(bitmap, cliprect, state->m_bg_tilemap, 0, 0);
exctsccr_draw_sprites(screen->machine(), bitmap, cliprect);
return 0;
}