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Add implementation for if this is the first

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This commit is contained in:
Gwilym Inzani 2023-06-27 21:31:06 +01:00
parent 938b052997
commit 306be59cde
2 changed files with 22 additions and 3 deletions
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17
agb/src/sound/mixer/mixer.s
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@ -91,7 +91,8 @@ same_modification:
agb_arm_end agb_rs__mixer_add
agb_arm_func agb_rs__mixer_add_stereo
.macro stereo_add_fn fn_name:req is_first:req
agb_arm_func \fn_name
@ Arguments
@ r0 - pointer to the data to be copied (u8 array)
@ r1 - pointer to the sound buffer (i16 array which will alternate left and right channels, 32-bit aligned)
@ -127,16 +128,24 @@ agb_arm_func agb_rs__mixer_add_stereo
lsl r6, r6, #24 @ r6 = | R | 0 | 0 | 0 | drop everything except the right sample
orr r6, r7, r6, asr #8 @ r6 = | 1 | R | 1 | L | now we have it perfectly set up
.ifc \is_first,true
mul \sample_reg, r6, r2
.else
mla \sample_reg, r6, r2, \sample_reg @ r4 += r6 * r2 (calculating both the left and right samples together)
.endif
.endm
1:
.ifc \is_first,true
.else
ldmia r1, {{r9-r12}} @ read the current values
.endif
add_stereo_sample r9
add_stereo_sample r10
add_stereo_sample r11
add_stereo_sample r12
.purgem add_stereo_sample
stmia r1!, {{r9-r12}} @ store the new value, and increment the pointer
@ -146,7 +155,11 @@ agb_arm_func agb_rs__mixer_add_stereo
pop {{r4-r11}}
bx lr
agb_arm_end agb_rs__mixer_add_stereo
agb_arm_end \fn_name
.endm
stereo_add_fn agb_rs__mixer_add_stereo false
stereo_add_fn agb_rs__mixer_add_stereo_first true
agb_arm_func agb_rs__mixer_collapse
@ Arguments:

8
agb/src/sound/mixer/sw_mixer.rs
View file

@ -35,6 +35,12 @@ extern "C" {
volume: Num<i16, 4>,
);
fn agb_rs__mixer_add_stereo_first(
sound_data: *const u8,
sound_buffer: *mut Num<i16, 4>,
volume: Num<i16, 4>,
);
fn agb_rs__mixer_collapse(
sound_buffer: *mut i8,
input_buffer: *const Num<i16, 4>,
@ -406,7 +412,7 @@ impl MixerBuffer {
working_buffer: &mut [Num<i16, 4>],
channels: impl Iterator<Item = &'a mut SoundChannel>,
) {
working_buffer.fill(0.into());
// working_buffer.fill(0.into());
for channel in channels {
if channel.is_done {