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apple2gs: Fix the behavior for fill mode when no previous color is set [R. Belmont]

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This commit is contained in:
arbee 2020-04-17 19:58:18 -04:00
parent c33ab8cd28
commit 5656c0ea8a
1 changed files with 9 additions and 0 deletions
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9
src/mame/video/apple2.cpp
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@ -1372,6 +1372,15 @@ uint32_t a2_video_device::screen_update_GS(screen_device &screen, bitmap_rgb32 &
} }
else // 320 mode else // 320 mode
{ {
// the low 5 bits of the SCB determine the initial fillmode color
// for the scanline (hardware testing by John Brooks)
static const uint32_t fillmode_init[32] =
{
2, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf,
0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf,
};
last_pixel = fillmode_init[scb & 0x1f];
for (col = 0; col < 160; col++) for (col = 0; col < 160; col++)
{ {
b = vram[col]; b = vram[col];