43 lines
724 B
ArmAsm
43 lines
724 B
ArmAsm
.global _gint_image_p8_normal
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#include "image_macros.S"
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/* P8 Opaque rendering, RAM version: trivial.
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As usual with RAM it is fairly easy to bottleneck writing speed, and so
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there is no need for complex methods. Building longwords could be an option,
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but it would require output alignment with edges, which is painful. */
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.macro GEN_NORMAL_LOOP HFLIP, OUT_DIR
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mov.l @r8+, r9 /* cmd.palette */
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.if \HFLIP
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add #-2, r5
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mov r2, r0
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shll r0
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add r0, r5
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shll r0
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add r0, r6
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.endif
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1: mov r2, r8
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2: mov.b @r3+, r0
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shll r0
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mov.w @(r0, r9), r0
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mov.w r0, @r5
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3: dt r8
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bf.s 2b
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add #\OUT_DIR, r5
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END
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EPILOGUE
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.endm
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_gint_image_p8_normal:
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tst #1, r0
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bf 9f
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GEN_NORMAL_LOOP 0, 2
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9: GEN_NORMAL_LOOP 1, -2
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