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more rendering fixes and optimisations

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This commit is contained in:
kub 2020-10-10 09:38:59 +02:00
parent 758abbebc2
commit 33cb1ab015
3 changed files with 66 additions and 11 deletions
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29
pico/draw_arm.S
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@ -570,6 +570,32 @@ DrawLayer:
@ r3=nametabadd[31:16]|must_be_0[15:8]|pal[7:0]
@ r1=pd+dx r2=pack r6=hc r9=prevcode r11=HighCol r12=nametab lr=vram
@ r4 & r7 are scratch in this loop
@ need to calc new ty?
lsls r7, r10, #7 @ (cell&1)?
bmi .dsloop_vs_subr1
@ calc offset and read tileline code to r7, also calc ty
add_c24 r7, lr, (OFS_PMEM_vsram-OFS_PMEM_vram)
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
bic r10,r10,#0xff @ clear old ty
and r4, r5, #0xff0000 @ scanline
add r4, r4, r7, lsl #16 @ ... += vscroll
and r4, r4, r5, lsl #16 @ ... &= ymask
and r7, r4, #0x70000
orr r10,r10,r7, lsr #15 @ new ty
mov r4, r4, lsr #19
mov r7, r5, lsr #24
mov r4, r4, lsl r7 @ nametabadd
and r3, r3, #0xff
orr r3, r3, r4, lsl #16 @ r3=(nametabadd[31:16],pal[15:0])
.dsloop_vs_subr1:
sub r1, r1, #8
.dsloop_vs: @ 40-41 times
@ -579,8 +605,7 @@ DrawLayer:
ble .dsloop_vs_exit
@ need to calc new ty?
lsls r7, r10, #7 @ (cell&1) && ...
mvnmis r7, r10 @ ... cell>=0
lsls r7, r10, #7 @ (cell&1)?
bmi 0f
@ calc offset and read tileline code to r7, also calc ty