1cf5bf514a
This change finally introduces gray image rendering with bopti. This is the final iteration of bopti v2 and certainly the fastest so far. All four profiles are supported, without change to the format.
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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