94 lines
1.5 KiB
ArmAsm
94 lines
1.5 KiB
ArmAsm
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.global _bopti_asm_mono
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.global _bopti_asm_mono_alpha
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# REGISTER ALLOCATION:
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# r0: layer (left)
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# r1: layer (right)
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# r2: (temp)
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# r3: -
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# --
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# r4: vram (left)
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# r5: vram (right)
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# r6: layer pointer; f(x&31)
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# r7: mask pointer
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# --
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# @r15: -(x&31)
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_bopti_asm_mono:
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# Read data longword and update the layer address pointer
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mov.l @r6, r2
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mov.l @r2+, r0
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mov.l r2, @r6
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mov r0, r1
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# Shift the layer data
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mov.l @r15, r6
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shld r6, r0
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add #32, r6
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shld r6, r1
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# Get the masks and clear the target VRAM area and unwanted image data
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mov.l @r7, r2
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and r2, r0
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not r2, r2
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and r2, r4
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mov.l @(4, r7), r2
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and r2, r1
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not r2, r2
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and r2, r5
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# Do the drawing by joining the two
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or r4, r0
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rts
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or r5, r1
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# REGISTER ALLOCATION
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# r0: layer_1 (left)
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# r1: layer_1 (right)
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# r2: layer_2 (left)
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# r3: layer_2 (right)
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# --
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# r4: vram (left)
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# r5: vram (right)
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# r6: layer pointer; f(x&31); mask (left); mask (right)
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# r7: mask pointer
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# --
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# @r15: -(x&31)
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_bopti_asm_mono_alpha:
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# Read data longwords and update the layer address pointer
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mov.l @r6, r2
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mov.l @r2+, r0
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mov.l @r2+, r3
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mov.l r2, @r6
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mov r0, r1
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mov r3, r2
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# Shift all layer data
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mov.l @r15, r6
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shld r6, r0
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shld r6, r2
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add #32, r6
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shld r6, r1
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shld r6, r3
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# Apply the masks on the layer data
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mov.l @r7, r6
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and r6, r0
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and r6, r2
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mov.l @(4, r7), r6
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and r6, r1
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and r6, r3
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# Blit the clear on the VRAM
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not r0, r0
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and r4, r0
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not r1, r1
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and r5, r1
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# Blit the write on the VRAM
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or r2, r0
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rts
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or r3, r1
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