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Unwind loop 4 times
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@ -19,6 +19,7 @@ agb_arm_func agb_rs__mixer_add
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mov r8, #SOUND_BUFFER_SIZE @ the number of steps left
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mov r8, #SOUND_BUFFER_SIZE @ the number of steps left
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1:
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1:
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.macro mixer_add_loop
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add r4, r0, r5, asr #8 @ calculate the address of the next read from the sound buffer
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add r4, r0, r5, asr #8 @ calculate the address of the next read from the sound buffer
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ldrsb r6, [r4] @ load the current sound sample to r6
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ldrsb r6, [r4] @ load the current sound sample to r6
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add r5, r5, r2 @ calculate the position to read the next sample from
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add r5, r5, r2 @ calculate the position to read the next sample from
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@ -28,8 +29,14 @@ agb_arm_func agb_rs__mixer_add
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mla r4, r6, r9, r4 @ r4 += r6 * r9 (calculating both the left and right samples together)
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mla r4, r6, r9, r4 @ r4 += r6 * r9 (calculating both the left and right samples together)
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str r4, [r1], #4 @ store the new value, and increment the pointer
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str r4, [r1], #4 @ store the new value, and increment the pointer
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.endm
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subs r8, r8, #1 @ loop counter
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mixer_add_loop
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mixer_add_loop
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mixer_add_loop
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mixer_add_loop
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subs r8, r8, #4 @ loop counter
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bne 1b @ jump back if we're done with the loop
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bne 1b @ jump back if we're done with the loop
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pop {r4-r10}
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pop {r4-r10}
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