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(MESS) tim100.c: Reduce tagmap lookups (nw)

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This commit is contained in:
Wilbert Pol 2014-09-19 20:29:36 +00:00
parent 711106a283
commit ed4eedbb58
1 changed files with 10 additions and 2 deletions
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12
src/mess/drivers/tim100.c
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@ -23,8 +23,12 @@ public:
required_device<cpu_device> m_maincpu;
required_device<palette_device> m_palette;
virtual void machine_start();
virtual void machine_reset();
I8275_DRAW_CHARACTER_MEMBER( crtc_display_pixels );
private:
UINT8 *m_charmap;
};
static ADDRESS_MAP_START(tim100_mem, AS_PROGRAM, 8, tim100_state)
@ -57,6 +61,11 @@ static const rgb_t tim100_palette[3] = {
rgb_t(0xff, 0xff, 0xff) // highlight
};
void tim100_state::machine_start()
{
m_charmap = memregion("chargen")->base();
}
void tim100_state::machine_reset()
{
m_palette->set_pen_colors(0, tim100_palette, ARRAY_LENGTH(tim100_palette));
@ -85,8 +94,7 @@ I8275_DRAW_CHARACTER_MEMBER( tim100_state::crtc_display_pixels )
{
int i;
const rgb_t *palette = m_palette->palette()->entry_list_raw();
UINT8 *charmap = memregion("chargen")->base();
UINT8 pixels = charmap[(linecount & 15) + (charcode << 4)];
UINT8 pixels = m_charmap[(linecount & 15) + (charcode << 4)];
if (vsp)
{
pixels = 0;