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GBA flat rasterizer optimization for small polys

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XProger
2021-10-31 03:09:26 +03:00
parent 634ef092ad
commit bce4ed8149
1 changed files with 4 additions and 21 deletions
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25
src/platform/gba/rasterizeF_mode4.s
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@@ -113,7 +113,7 @@ rasterizeF_mode4_asm:
.align_right: .align_right:
tst width, #1 tst width, #1
beq .align_block beq .scanline_block_2px
ldrb pair, [tmp, width] ldrb pair, [tmp, width]
subs width, #1 // width-- subs width, #1 // width--
lsl pair, #8 lsl pair, #8
@@ -121,27 +121,10 @@ rasterizeF_mode4_asm:
strh pair, [tmp, width] strh pair, [tmp, width]
beq .scanline_end // if (width == 0) beq .scanline_end // if (width == 0)
.align_block: .scanline_block_2px:
// 8px alignment
lsr blocks, width, #1
and blocks, blocks, #3 // blocks = (width / 2) % 4
rsbs blocks, blocks, #2
add pc, blocks, lsl #2 // pc += (2 - blocks) * 4
strh index, [tmp], #2 // if (width % 4) == 3
strh index, [tmp], #2 // if (width % 4) == 2
strh index, [tmp], #2 // if (width % 4) == 1
lsrs blocks, width, #3 // blocks = (width / 2) / 4
beq .scanline_end // if (blocks == 0) no 8px blocks
.scanline_block_8px:
strh index, [tmp], #2 strh index, [tmp], #2
strh index, [tmp], #2 subs width, #2
strh index, [tmp], #2 bne .scanline_block_2px
strh index, [tmp], #2
subs blocks, #1
bne .scanline_block_8px
.scanline_end: .scanline_end:
add Lx, Ldx // Lx += Ldx add Lx, Ldx // Lx += Ldx