MP fix

vampirefrog · vampirefrog · commit fb07d24e4fae · 2024-11-13T01:53:05.000+02:00
diff --git a/mdx_compiler.c b/mdx_compiler.c
@@ -442,7 +442,7 @@ void mdx_compiler_maof(struct mdx_compiler *compiler, int chan_mask) {
 
 void mdx_compiler_mp(struct mdx_compiler *compiler, int chan_mask, int waveform, int freq, int amplitude) {
 	mdx_compiler_write(compiler, chan_mask, 0xec, waveform & 0x03, -1);
-	mdx_compiler_write16(compiler, chan_mask, freq * 2, amplitude * 128, -1);
+	mdx_compiler_write16(compiler, chan_mask, freq * 2, (amplitude & 0xff) << 8, -1);
 }
 
 void mdx_compiler_mpon(struct mdx_compiler *compiler, int chan_mask) {
diff --git a/mdx_decompiler.c b/mdx_decompiler.c
@@ -303,7 +303,7 @@ void mdx_decompiler_decompile(struct mdx_decompiler *d, struct mdx_file *f) {
 					else if(b[1] == 0x81)
 						MMLF("MPON")
 					else
-						MMLF("MP%d,%d,%d", b[1], b[2] << 8 | b[3], b[4] << 8 | b[5])
+						MMLF("MP%d,%d,%d", b[1], b[2] << 8 | b[3], b[4] >= 128 ? b[4] - 256 : b[4])
 					break;
 				case 0xeb:
 					if(b[1] == 0x80)

Original file line number	Diff line number	Diff line change
`@@ -442,7 +442,7 @@ void mdx_compiler_maof(struct mdx_compiler *compiler, int chan_mask) {`
`442`	`442`
`443`	`443`	`void mdx_compiler_mp(struct mdx_compiler *compiler, int chan_mask, int waveform, int freq, int amplitude) {`
`444`	`444`	`mdx_compiler_write(compiler, chan_mask, 0xec, waveform & 0x03, -1);`
`445`		`- mdx_compiler_write16(compiler, chan_mask, freq * 2, amplitude * 128, -1);`
	`445`	`+ mdx_compiler_write16(compiler, chan_mask, freq * 2, (amplitude & 0xff) << 8, -1);`
`446`	`446`	`}`
`447`	`447`
`448`	`448`	`void mdx_compiler_mpon(struct mdx_compiler *compiler, int chan_mask) {`