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vdp rendering fixes (debug register, vscroll) for overdrive 2

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This commit is contained in:
kub 2020-03-19 22:45:06 +01:00
parent c55a44a88c
commit 6dd553c7a8
2 changed files with 218 additions and 48 deletions
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8
pico/draw_arm.S
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@ -545,8 +545,12 @@ DrawLayer:
eor r3, r3, r7
sub r10,r10, #1<<24 @ cell-- // start from negative for hscroll
tst r3, #0x08
add_c24 r1, lr, (OFS_PMEM_vsram-OFS_PMEM_vram)
ldr r3, [r1, #0x4c] @ r3=vsram[0x26..0x27]
subne r10,r10, #1<<16 @ cells--
subne r10,r10, #1<<24 @ cell-- // even more negative
ror r3, r3, #16
str r3, [r1, #0x7c] @ vsram[0x3e..0x3f]=r3
0:
tst r9, #1<<31
mov r3, #0
@ -577,8 +581,8 @@ DrawLayer:
@ calc offset and read tileline code to r7, also calc ty
add_c24 r7, lr, (OFS_PMEM_vsram-OFS_PMEM_vram)
add r7, r7, r10,asr #23 @ vsram + ((cell&~1)<<1)
bic r7, r7, #3
and r4, r10, #0x3e000000
add r7, r7, r4, asr #23 @ vsram + ((cell&0x3e)<<1)
tst r10,#0x8000 @ plane1?
addne r7, r7, #2
ldrh r7, [r7] @ r7=vscroll