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Extract to macro
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@ -169,17 +169,21 @@ agb_arm_func agb_rs__mixer_collapse
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mov r4, r2
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mov r4, r2
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1:
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1:
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@ r12 = *r1; r1++
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.macro load_sample left_reg:req right_reg:req
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ldr r12, [r1], #4
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@ left_reg = *r1; r1++
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ldr \left_reg, [r1], #4
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lsl r3, r12, #16 @ r3 is going to be the right sample, push r12 left 16 bits first
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lsl \right_reg, \left_reg, #16 @ push the sample 16 bits first
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asr r3, r3, #20 @ move r3 back to being the correct value
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asr \right_reg, \right_reg, #20 @ move right sample back to being the correct value
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mov r12, r12, asr #20 @ r12 = left sample
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mov \left_reg, \left_reg, asr #20 @ now we only have the left sample
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clamp_s8 r12 @ clamp the audio to 8 bit values
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clamp_s8 \left_reg @ clamp the audio to 8 bit values
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clamp_s8 r3
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clamp_s8 \right_reg
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.endm
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strb r3, [r0, r4] @ *(r0 + r4 = SOUND_BUFFER_SIZE) = r3
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load_sample r3, r12
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strb r3, [r0, r4] @ *(r0 + (r4 = SOUND_BUFFER_SIZE)) = r3
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strb r12, [r0], #1 @ *r0 = r12; r0++
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strb r12, [r0], #1 @ *r0 = r12; r0++
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subs r2, r2, #1 @ r2 -= 1
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subs r2, r2, #1 @ r2 -= 1
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