Added recomp runtime library and portultra, MM initial boot

src/ai.cpp

@@ -0,0 +1,29 @@
+#include "recomp.h"
+#include <cstdio>
+#include <string>
+#include "../portultra/ultra64.h"
+#include "../portultra/multilibultra.hpp"
+
+#define VI_NTSC_CLOCK 48681812
+
+extern "C" void osAiSetFrequency_recomp(uint8_t* rdram, recomp_context* ctx) {
+    uint32_t freq = ctx->r4;
+    // This makes actual audio frequency more accurate to console, but may not be desirable
+    //uint32_t dacRate = (uint32_t)(((float)VI_NTSC_CLOCK / freq) + 0.5f);
+    //freq = VI_NTSC_CLOCK / dacRate;
+    ctx->r2 = freq;
+    Multilibultra::set_audio_frequency(freq);
+}
+
+extern "C" void osAiSetNextBuffer_recomp(uint8_t* rdram, recomp_context* ctx) {
+    Multilibultra::queue_audio_buffer(rdram, ctx->r4, ctx->r5);
+    ctx->r2 = 0;
+}
+
+extern "C" void osAiGetLength_recomp(uint8_t* rdram, recomp_context* ctx) {
+    ctx->r2 = Multilibultra::get_remaining_audio_bytes();
+}
+
+extern "C" void osAiGetStatus_recomp(uint8_t* rdram, recomp_context* ctx) {
+    ctx->r2 = 0x00000000; // Pretend the audio DMAs finish instantly
+}