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correct color prom resistors

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This commit is contained in:
Michaël Banaan Ananas 2014-09-16 23:49:02 +00:00
parent 8c10d68e1d
commit b58ab0b000
1 changed files with 34 additions and 35 deletions
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69
src/mame/video/skyfox.c
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@ -36,6 +36,7 @@
***************************************************************************/
#include "emu.h"
#include "video/resnet.h"
#include "includes/skyfox.h"
@ -44,45 +45,42 @@
Convert the color PROMs into a more useable format.
There are three 256x4 palette PROMs (one per gun).
I don't know the exact values of the resistors between the RAM and the
RGB output. I assumed these values (the same as Commando)
The palette PROMs are connected to the RGB output this way:
bit 3 -- 220 ohm resistor -- RED/GREEN/BLUE
-- 470 ohm resistor -- RED/GREEN/BLUE
-- 1 kohm resistor -- RED/GREEN/BLUE
bit 0 -- 2.2kohm resistor -- RED/GREEN/BLUE
bit 3 -- 110 ohm resistor -- RED/GREEN/BLUE
-- 220 ohm resistor -- RED/GREEN/BLUE
-- 680 ohm resistor -- RED/GREEN/BLUE
bit 0 -- 1.2kohm resistor -- RED/GREEN/BLUE
***************************************************************************/
static const res_net_decode_info skyfox_decode_info =
{
1,
0, 255, // start/end
// R, G, B,
{ 0, 0x100, 0x200, }, // offsets
{ 0, 0, 0, }, // shifts
{ 0xf, 0xf, 0xf, } // masks
};
static const res_net_info skyfox_net_info =
{
RES_NET_VCC_5V | RES_NET_VBIAS_5V | RES_NET_VIN_TTL_OUT,
{
{ RES_NET_AMP_NONE, 0, 0, 4, { 1200, 680, 220, 110 } },
{ RES_NET_AMP_NONE, 0, 0, 4, { 1200, 680, 220, 110 } },
{ RES_NET_AMP_NONE, 0, 0, 4, { 1200, 680, 220, 110 } }
}
};
PALETTE_INIT_MEMBER(skyfox_state, skyfox)
{
const UINT8 *color_prom = memregion("proms")->base();
dynamic_array<rgb_t> rgb;
for (int i = 0; i < 256; i++)
{
int bit0, bit1, bit2, bit3, r, g, b;
/* red component */
bit0 = (color_prom[i] >> 0) & 0x01;
bit1 = (color_prom[i] >> 1) & 0x01;
bit2 = (color_prom[i] >> 2) & 0x01;
bit3 = (color_prom[i] >> 3) & 0x01;
r = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
/* green component */
bit0 = (color_prom[i + 256] >> 0) & 0x01;
bit1 = (color_prom[i + 256] >> 1) & 0x01;
bit2 = (color_prom[i + 256] >> 2) & 0x01;
bit3 = (color_prom[i + 256] >> 3) & 0x01;
g = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
/* blue component */
bit0 = (color_prom[i + 2*256] >> 0) & 0x01;
bit1 = (color_prom[i + 2*256] >> 1) & 0x01;
bit2 = (color_prom[i + 2*256] >> 2) & 0x01;
bit3 = (color_prom[i + 2*256] >> 3) & 0x01;
b = 0x0e * bit0 + 0x1f * bit1 + 0x43 * bit2 + 0x8f * bit3;
palette.set_pen_color(i, rgb_t(r, g, b));
}
compute_res_net_all(rgb, color_prom, skyfox_decode_info, skyfox_net_info);
palette.set_pen_colors(0, rgb, 256);
/* Grey scale for the background??? is wrong */
for (int i = 0; i < 256; i++)
@ -92,7 +90,6 @@ PALETTE_INIT_MEMBER(skyfox_state, skyfox)
}
/***************************************************************************
Sprites Drawing
@ -173,10 +170,12 @@ void skyfox_state::draw_sprites( bitmap_ind16 &bitmap, const rectangle &cliprect
for (dy = ystart; dy != yend; dy += yinc)
{
for (dx = xstart; dx != xend; dx += xinc)
for (dx = xstart; dx != xend; dx += xinc, code++)
{
gfx->transpen(bitmap, cliprect, code, 0, flipx, flipy, dx*8 + x, dy*8 + y, 0xff);
code++;
// wraparound y - BTANB: large sprites exiting the screen sometimes reappear on the other edge
gfx->transpen(bitmap, cliprect, code, 0, flipx, flipy, dx*8 + x, dy*8 + y - 256, 0xff);
}
if (n == 2)
@ -229,7 +228,7 @@ void skyfox_state::draw_background(bitmap_ind16 &bitmap, const rectangle &clipre
UINT32 skyfox_state::screen_update_skyfox(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect)
{
bitmap.fill(255, cliprect); // the bg is black
bitmap.fill(m_palette->black_pen(), cliprect);
draw_background(bitmap, cliprect);
draw_sprites(bitmap, cliprect);
return 0;