Work around very brittle snapshot code

src/snes/apu.c

@@ -54,7 +54,7 @@ void apu_reset(Apu* apu) {
 }
 
 void apu_saveload(Apu *apu, SaveLoadFunc *func, void *ctx) {
-  func(ctx, apu->ram, offsetof(Apu, hist) - offsetof(Apu, ram));
+  func(ctx, apu->ram, offsetof(Apu, pad) + 6 - offsetof(Apu, ram));
   dsp_saveload(apu->dsp, func, ctx);
   spc_saveload(apu->spc, func, ctx);
 }

src/snes/apu.h

@@ -33,6 +33,8 @@ struct Apu {
   uint8_t outPorts[4];
   Timer timer[3];
   uint8_t cpuCyclesLeft;
+  uint8_t pad[6];
+
 
   union {
     struct DspRegWriteHistory hist;

src/snes/dma.c

@@ -65,7 +65,7 @@ void dma_reset(Dma* dma) {
 }
 
 void dma_saveload(Dma *dma, SaveLoadFunc *func, void *ctx) {
-  func(ctx, &dma->channel, sizeof(Dma) - offsetof(Dma, channel));
+  func(ctx, &dma->channel, offsetof(Dma, pad) + 7 - offsetof(Dma, channel));
 }
 
 uint8_t dma_read(Dma* dma, uint16_t adr) {

src/snes/dma.h

@@ -40,6 +40,7 @@ struct Dma {
   uint16_t hdmaTimer;
   uint32_t dmaTimer;
   bool dmaBusy;
+  uint8_t pad[7];
 };
 
 Dma* dma_init(Snes* snes);

src/snes/snes.h

@@ -24,16 +24,19 @@ struct Snes {
   Ppu* ppu, *snes_ppu, *my_ppu;
   Dma* dma;
   Cart* cart;
+  Input *input1;
+  Input *input2;
   // input
   bool debug_cycles;
   bool debug_apu_cycles;
   bool disableRender;
   uint8_t runningWhichVersion;
-  Input* input1;
-  Input* input2;
+
   // ram
-  uint8_t *ram;
   uint32_t ramAdr;
+  uint8_t *ram;
+  uint8_t padx[4];
+
   // frame timing
   uint16_t hPos;
   uint16_t vPos;
@@ -41,6 +44,7 @@ struct Snes {
   // cpu handling
   uint8_t cpuCyclesLeft;
   uint8_t cpuMemOps;
+  uint8_t padpad[2];
   double apuCatchupCycles;
   // nmi / irq
   bool hIrqEnabled;