Rewrite GPU bios functions according to OpenBIOS.

See PCSX-Redux :
https://github.com/grumpycoders/pcsx-redux/blob/93653ba5281487d3bed57371d7b64c32dfc669f0/src/mips/openbios/gpu/gpu.c

diff --git a/libpcsxcore/psxbios.c b/libpcsxcore/psxbios.c
index 6016f7e..cd627a0 100644 (file)
--- a/libpcsxcore/psxbios.c
+++ b/libpcsxcore/psxbios.c
@@ -1408,37 +1408,37 @@ void psxBios_FlushCache() { // 44
 
 void psxBios_GPU_dw() { // 0x46
        int size;
-       s32 *ptr;
+       u32 *ptr;
 
 #ifdef PSXBIOS_LOG
        PSXBIOS_LOG("psxBios_%s\n", biosA0n[0x46]);
 #endif
 
        GPU_writeData(0xa0000000);
-       GPU_writeData((a1<<16)|(a0&0xffff));
-       GPU_writeData((a3<<16)|(a2&0xffff));
-       size = (a2*a3+1)/2;
-       ptr = (s32*)PSXM(Rsp[4]);  //that is correct?
-       do {
-               GPU_writeData(SWAP32(*ptr));
-               ptr++;
-       } while(--size);
+       GPU_writeData((a1<<0x10)|(a0&0xffff));
+       GPU_writeData((a3<<0x10)|(a2&0xffff));
+       size = (a2*a3)/2;
+       ptr = (u32*)PSXM(Rsp[4]);  //that is correct?
+       while(size--)
+       {
+               GPU_writeData(SWAPu32(*ptr++));
+       } 
 
        pc0 = ra;
 }
 
 void psxBios_mem2vram() { // 0x47
        int size;
-
+       gpuSyncPluginSR();
        GPU_writeData(0xa0000000);
-       GPU_writeData((a1<<16)|(a0&0xffff));
-       GPU_writeData((a3<<16)|(a2&0xffff));
-       size = (a2*a3+1)/2;
+       GPU_writeData((a1<<0x10)|(a0&0xffff));
+       GPU_writeData((a3<<0x10)|(a2&0xffff));
+       size = ((((a2 * a3) / 2) >> 4) << 16);
        GPU_writeStatus(0x04000002);
        psxHwWrite32(0x1f8010f4,0);
        psxHwWrite32(0x1f8010f0,psxHwRead32(0x1f8010f0)|0x800);
        psxHwWrite32(0x1f8010a0,Rsp[4]);//might have a buggy...
-       psxHwWrite32(0x1f8010a4,((size/16)<<16)|16);
+       psxHwWrite32(0x1f8010a4, size | 0x10);
        psxHwWrite32(0x1f8010a8,0x01000201);
 
        pc0 = ra;
@@ -1451,22 +1451,26 @@ void psxBios_SendGPU() { // 0x48
 }
 
 void psxBios_GPU_cw() { // 0x49
+       gpuSyncPluginSR();
        GPU_writeData(a0);
+       v0 = HW_GPU_STATUS;
        pc0 = ra;
 }
 
 void psxBios_GPU_cwb() { // 0x4a
-       s32 *ptr = (s32*)Ra0;
+       u32 *ptr = (u32*)Ra0;
        int size = a1;
-       while(size--) {
-               GPU_writeData(SWAP32(*ptr));
-               ptr++;
+       gpuSyncPluginSR();
+       while(size--)
+       {
+               GPU_writeData(SWAPu32(*ptr++));
        }
 
        pc0 = ra;
 }
-
-void psxBios_GPU_SendPackets() { //4b:
+   
+void psxBios_GPU_SendPackets() { //4b: 
+       gpuSyncPluginSR();
        GPU_writeStatus(0x04000002);
        psxHwWrite32(0x1f8010f4,0);
        psxHwWrite32(0x1f8010f0,psxHwRead32(0x1f8010f0)|0x800);