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vdp rendering fixes

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This commit is contained in:
kub 2020-03-27 19:25:20 +01:00
parent bd73e6eec0
commit 61114cd8b4
2 changed files with 17 additions and 6 deletions
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11
pico/draw_arm.S
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@ -523,6 +523,9 @@ DrawLayer:
@ @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
.DrawStrip_vsscroll:
tst r8, #1 @ if h40: lflags |= 0x10000
orrne r0, r0, #0x10000
rsb r8, r3, #0
mov r8, r8, lsr #3 @ r8=tilex=(-ts->hscroll)>>3
bic r8, r8, #0x3fc00000
@ -545,11 +548,13 @@ 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
add_c24 r1, lr, (OFS_PMEM_vsram-OFS_PMEM_vram)
tst r0, #0x10000 @ h40?
ldrne r3, [r1, #0x00] @ r3=vsram[0x00..0x01]
ldreq r3, [r1, #0x40] @ r3=vsram[0x20..0x21]
str r3, [r1, #0x7c] @ vsram[0x3e..0x3f]=r3
0:
tst r9, #1<<31