Useless bugfix for MixAudio

Still broken on SDL2

yaglitch.asm

@@ -17,6 +17,8 @@
 
 [bits 64]
 
+%define MIX_AUDIO ; allowing to write all the buffer at once in IPC pipe
+
 %include "sdl.asm"
 %include "utils.asm"
 
@@ -101,6 +103,11 @@ section .bss
 		cllbck_heapsz: resw 1
 	%endif
 
+	; Pipe allowing callback to send data to main thread
+	ipc_pipe:
+		.rd: resq 1
+		.wr: resq 1
+
 section .text
 global _start
 _start:
@@ -348,6 +355,14 @@ stack_init:
 	mov [tosp], eax
 
 sdl_init:
+	
+	; Opening IPC pipe
+	mov rax, 0x16 ; sys_pipe
+	mov rdi, ipc_pipe
+	syscall
+	test rax, rax
+	jnz exit_fatal
+
 	mov rdi, 0x0000FFFF
 	call SDL_Init
 
@@ -650,7 +665,7 @@ audio_cllbck:
 	push rbx
 	mov rcx, [cllbck_heapsz]
 	cmp rcx, rdx
-	jle .heap_brk
+	jl .heap_brk
 	.continue:
 		mov rdi, [cllbck_heap]
 		push rdx ; len
@@ -669,7 +684,19 @@ audio_cllbck:
 		pop rdi ; *stream
 		pop rsi ; heap_start
 		pop rdx ; len
+		;mov rsi, [rsp] ; heap_start
+		;mov rdx, [rsp+8] ; len
 		mov rcx, SDL_MAX_VOLUME
+		call SDL_MixAudio
+
+		;mov rax, 0x1 ; sys_write
+		;mov rdi, [ipc_pipe.wr]
+		;pop rsi ; heap_start
+		;pop rdx ; len
+		;syscall
+		;cmp rax, -1
+		;je exit_fatal
+
 		pop rbx
 		ret
 	.heap_brk: ; resize heap to handle 
@@ -678,13 +705,12 @@ audio_cllbck:
 		push rdx
 		mov rdi, [cllbck_heap]
 		add rdi, rdx
-		sub rdi, rcx
 		mov rax, 0xc ; brk
 		syscall
-		mov [cllbck_heap], rax
 		pop rdx
 		pop rsi
 		pop rdi
+		mov [cllbck_heapsz], rdx
 		jmp .continue
 %endif