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Extract to macros
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@ -14,6 +14,13 @@ agb_arm_func \fn_name
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ldr r7, [sp, #20] @ load the right channel modification amount into r7
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ldr r7, [sp, #20] @ load the right channel modification amount into r7
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ldr r8, [sp, #24] @ load the buffer size into r8
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ldr r8, [sp, #24] @ load the buffer size into r8
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movs r8, r8 @ check that the buffer size isn't 0
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bne 1f
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pop {{r4-r8}}
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bx lr
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1:
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cmp r7, r3 @ check if left and right channel need the same modifications
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cmp r7, r3 @ check if left and right channel need the same modifications
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beq 3f @ same modification
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beq 3f @ same modification
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@ -22,8 +29,7 @@ agb_arm_func \fn_name
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mov r5, #0 @ current index we're reading from
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mov r5, #0 @ current index we're reading from
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1:
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.macro add_one_sample
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.rept 4
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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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@ -36,8 +42,12 @@ agb_arm_func \fn_name
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.endif
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.endif
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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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1:
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.rept 4
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add_one_sample
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.endr
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.endr
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.purgem add_one_sample
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subs r8, r8, #4 @ loop counter
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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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@ -63,13 +73,11 @@ agb_arm_func \fn_name
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mov r5, #0 @ current index we're reading from
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mov r5, #0 @ current index we're reading from
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1:
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.macro add_one_sample_same_modification
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.rept 4
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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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lsl r6, r6, #16
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lsl r6, r6, #16
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orr r6, r6, lsr #16
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orr r6, r6, lsr #16
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@ -81,7 +89,12 @@ agb_arm_func \fn_name
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.endif
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.endif
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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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1:
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.rept 4
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add_one_sample_same_modification
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.endr
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.endr
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.purgem add_one_sample_same_modification
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subs r8, r8, #4 @ loop counter
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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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