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better understanding of the blending (nw)

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This commit is contained in:
Olivier Galibert 2014-09-06 21:41:38 +00:00
parent efbcbd8f28
commit cdbbdfbb77
1 changed files with 2 additions and 5 deletions
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7
src/mame/drivers/raiden2.c
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@ -1084,8 +1084,7 @@ void raiden2_state::blend_layer(bitmap_rgb32 &bitmap, const rectangle &cliprect,
// Tuned for raiden2
const UINT8 alpha_active[0x20] = { // MSB first
//00 08 10 18 20 28 30 38 40 48 50 58 60 68 70 78
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x2f, 0x3f, 0x73, 0xff, 0xfc, 0xf0, 0x04, 0x47,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x0f, 0xfb, 0x08
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x05, 0x3f, 0x73, 0xff, 0x7c, 0xff, 0xff, 0x4f
};
const pen_t *pens = &m_palette->pen(0);
@ -1099,9 +1098,7 @@ void raiden2_state::blend_layer(bitmap_rgb32 &bitmap, const rectangle &cliprect,
val &= 0x07ff;
int page = val >> 4;
bool active = false;
if((val & 0xf) == 0xe && (alpha_active[page >> 3] & (0x80 >> (page & 7))))
active = true;
if((val & 0x8) == 0x8 && (alpha_active[0x10+(page >> 3)] & (0x80 >> (page & 7))))
if((val & 0x8) == 0x8 && (alpha_active[page >> 3] & (0x80 >> (page & 7))))
active = true;
if(page == ccol)