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cvs: improve starfield density and blink rate

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This commit is contained in:
hap 2024-12-08 15:07:23 +01:00
parent 8c31c9615e
commit 2d13b30fea
2 changed files with 36 additions and 36 deletions
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60
src/mame/misc/cvs.cpp
View File

@ -1,10 +1,28 @@
// license:BSD-3-Clause
// copyright-holders: Mike Coates, Couriersud
/***************************************************************************
/*******************************************************************************
Century CVS System
Driver by Mike Coates
Thanks to Malcolm & Darren for hardware info
Additional work by Couriersud, 2009
TODO:
- darkwar coin insert sound effect is missing. It sends the correct command,
but before audiocpu reads it, maincpu writes a new command for the speech cpu.
This worked fine in an older version of MAME since maincpu was twice slower.
- diggerc loses speech sound effects (walking, digging) after killing an enemy.
- Emulate protection properly in later games (reads area 0x73fx).
- The board most probably has discrete circuits. Possibly 2 beepers (current
frequency is completely guessed), and a pitch sweep sound. No schematics
are available, or even video references.
- Improve starfield: density, blink rate, x repeat of 240, and the checkerboard
pattern (fast forward MAME to see) are all correct, the RNG is not right?
MAIN BOARD:
FLAG LOW | FLAG HIGH
@ -79,28 +97,12 @@ ADR14 ADR13 | READ | WRITE
| D7 = BULLET AND CP1 OR CP2 |
------------+-------------------------------------------+-------------------------------
Driver by
Mike Coates
Main 2650 runs at 1.78MHz (14.318/8).
Hardware Info
Malcolm & Darren
Sound board 2650s run at 0.89MHz (14.318/16). Also seen with a 15.625MHz XTAL,
which would result in slightly higher DAC sound pitch.
Additional work
Couriersud, 2009
TODO:
- darkwar coin insert sound effect is missing. It sends the correct command,
but before audiocpu reads it, maincpu writes a new command for the speech cpu.
This worked fine in an older version of MAME since maincpu was twice slower.
- diggerc loses speech sound effects (walking, digging) after killing an enemy.
- Emulate protection properly in later games (reads area 0x73fx).
- The board most probably has discrete circuits. Possibly 2 beepers (current
frequency is completely guessed), and a pitch sweep sound. No schematics
are available, or even video references.
- Is the star generator correct? On photos, it looks like there are more stars
overall (higher star density).
***************************************************************************/
*******************************************************************************/
#include "emu.h"
@ -178,7 +180,7 @@ protected:
private:
// max stars is more than it needs to be, to allow experimenting with the star generator
static constexpr u16 MAX_STARS = 0x400;
static constexpr u16 MAX_STARS = 0x800;
static constexpr u16 SPRITE_PEN_BASE = 0x820;
static constexpr u16 BULLET_STAR_PEN = 0x828;
@ -408,14 +410,14 @@ void cvs_state::init_stars()
m_total_stars = 0;
// precalculate the star background
for (int y = 255; y >= 0; y--)
for (int y = 0; y < 256; y++)
{
for (int x = 511; x >= 0; x--)
for (int x = 0; x < 480; x++)
{
generator <<= 1;
generator |= BIT(~generator, 17) ^ BIT(generator, 5);
if ((generator & 0x130fe) == 0xfe && m_total_stars != MAX_STARS)
if ((generator & 0x100fe) == 0xfe && m_total_stars != MAX_STARS)
{
m_stars[m_total_stars].x = x;
m_stars[m_total_stars].y = y;
@ -430,10 +432,10 @@ void cvs_state::update_stars(bitmap_ind16 &bitmap, const rectangle &cliprect)
{
for (int offs = 0; offs < m_total_stars; offs++)
{
u8 x = (m_stars[offs].x + m_stars_scroll) >> 1;
u8 y = m_stars[offs].y + ((m_stars_scroll + m_stars[offs].x) >> 9);
u8 x = ((m_stars[offs].x + m_stars_scroll) >> 1) % 240;
u8 y = m_stars[offs].y;
if (BIT(y, 0) ^ BIT(x, 4))
if (BIT(y, 4) ^ BIT(x, 5))
{
if (cliprect.contains(x, y) && m_palette->pen_indirect(bitmap.pix(y, x)) == 0)
bitmap.pix(y, x) = BULLET_STAR_PEN;
@ -444,7 +446,7 @@ void cvs_state::update_stars(bitmap_ind16 &bitmap, const rectangle &cliprect)
void cvs_state::scroll_stars(int state)
{
if (state)
m_stars_scroll++;
m_stars_scroll = (m_stars_scroll + 1) % 480;
}

12
src/mame/zaccaria/galaxia.cpp
View File

@ -67,9 +67,9 @@ TODO:
- support screen raw params, blanking is much like how laserbat hardware does it
and is needed to correct the speed in all machines
- provide accurate sprite/bg sync in astrowar
- improve starfield: density, blink rate, x repeat of 240, and the checkerboard
pattern (fast forward MAME to see) are all correct, the RNG is not right?
It may differ per PCB, not all PCB videos have the same star RNG pattern.
- improve starfield RNG pattern. Other than the colors, it should be the same as
CVS. It may differ per PCB, not all PCB videos have the same star RNG pattern.
Maybe initial contents of the shift registers?
- add sound board emulation (info is in the schematics)
- add support for flip screen
@ -285,7 +285,7 @@ void galaxia_state::init_stars()
generator |= BIT(~generator, 17) ^ BIT(generator, 5);
// stars are enabled if the shift register output is 0, and bits 1-7 are set
if ((generator & 0x200fe) == 0xfe && m_total_stars != MAX_STARS)
if ((generator & 0x100fe) == 0xfe && m_total_stars != MAX_STARS)
{
m_stars[m_total_stars].x = x;
m_stars[m_total_stars].y = y;
@ -315,9 +315,7 @@ void galaxia_state::update_stars(bitmap_ind16 &bitmap, const rectangle &cliprect
void galaxia_state::scroll_stars(int state)
{
if (state)
m_stars_scroll++;
m_stars_scroll %= 480;
m_stars_scroll = (m_stars_scroll + 1) % 480;
}