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Added support for variable high bit in graphics.

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This commit is contained in:
Martin Haye 2013-09-04 07:47:23 -07:00
parent 0df74eef43
commit 0f9ab95bea
1 changed files with 12 additions and 3 deletions
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15
Platform/Apple/virtual/src/raycast/render.s
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@ -1006,7 +1006,14 @@ clearBlit:
makeDecodeTbls:
ldx #0
@shiftA:
; extract only bits 0 and 2 for now
; bit 4 controls the high bit (orange/blue vs green/purple)
txa
asl
asl
asl
and #$80
sta tmp+1
; extract only bits 0 and 2 for the pixel data
txa
and #4
lsr
@ -1015,19 +1022,21 @@ makeDecodeTbls:
and #1
ora tmp
@decodeTo01:
ora tmp+1
sta decodeTo01,x
@decodeTo23:
asl
asl
ora tmp+1
sta decodeTo23,x
@decodeTo45:
asl
asl
ora #$80
ora tmp+1
sta decodeTo45,x
@decodeTo56:
asl
ora #$80
ora tmp+1
sta decodeTo56,x
@decodeTo57:
asl