//
// GPU Core
//
-// by Cal2
+// Originally by David Raingeard (Cal2)
// GCC/SDL port by Niels Wagenaar (Linux/WIN32) and Caz (BeOS)
// Cleanups, endian wrongness, and bad ASM amelioration by James L. Hammons
// Note: Endian wrongness probably stems from the MAME origins of this emu and
static void gpu_opcode_sat24(void);
static void gpu_opcode_pack(void);
-uint8 gpu_opcode_cycles[64] =
+// This is wrong, since it doesn't take pipeline effects into account. !!! FIX !!!
+/*uint8 gpu_opcode_cycles[64] =
{
3, 3, 3, 3, 3, 3, 3, 3,
3, 3, 3, 3, 3, 3, 3, 3,
5, 4, 5, 6, 6, 1, 1, 1,
1, 2, 2, 2, 1, 1, 9, 3,
3, 1, 6, 6, 2, 2, 3, 3
+};//*/
+//Here's a QnD kludge...
+//This is wrong, wrong, WRONG, but it seems to work for the time being...
+//(That is, it fixes Flip Out which relies on GPU timing rather than semaphores. Bad developers! Bad!)
+//What's needed here is a way to take pipeline effects into account (including pipeline stalls!)...
+uint8 gpu_opcode_cycles[64] =
+{
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 9, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 1, 2,
+ 2, 2, 2, 3, 3, 1, 1, 1,
+ 1, 1, 1, 1, 1, 1, 4, 1,
+ 1, 1, 3, 3, 1, 1, 1, 1
};
void (*gpu_opcode[64])()=
return data >> 16;
}
-//TEMP--Mirror of F03000?
-if (offset >= 0xF0B000 && offset <= 0xF0BFFF)
-WriteLog("[GPUR16] --> Possible GPU RAM mirror access by %s!", whoName[who]);
+//TEMP--Mirror of F03000? No. Writes only...
+//if (offset >= 0xF0B000 && offset <= 0xF0BFFF)
+//WriteLog("[GPUR16] --> Possible GPU RAM mirror access by %s!", whoName[who]);
return JaguarReadWord(offset, who);
}
return 0;
}
}
-//TEMP--Mirror of F03000?
-if (offset >= 0xF0B000 && offset <= 0xF0BFFF)
- WriteLog("[GPUR32] --> Possible GPU RAM mirror access by %s!\n", whoName[who]);
+//TEMP--Mirror of F03000? No. Writes only...
+//if (offset >= 0xF0B000 && offset <= 0xF0BFFF)
+// WriteLog("[GPUR32] --> Possible GPU RAM mirror access by %s!\n", whoName[who]);
/*if (offset >= 0xF1D000 && offset <= 0xF1DFFF)
WriteLog("[GPUR32] --> Reading from Wavetable ROM!\n");//*/
/* offset &= 0xFFF;
SET16(gpu_ram_8, offset, data);//*/
+/*if (offset >= 0xF03214 && offset < 0xF0321F)
+ WriteLog("GPU: Writing WORD (%04X) to GPU RAM (%08X)...\n", data, offset);//*/
+
+
//This is the same stupid worthless code that was in the DSP!!! AARRRGGGGHHHHH!!!!!!
/* if (!gpu_in_exec)
{
}
#endif // GPU_DEBUG
-/* gpu_ram_8[offset & 0xFFF] = (data >> 24) & 0xFF,
- gpu_ram_8[(offset+1) & 0xFFF] = (data >> 16) & 0xFF,
- gpu_ram_8[(offset+2) & 0xFFF] = (data >> 8) & 0xFF,
- gpu_ram_8[(offset+3) & 0xFFF] = data & 0xFF;//*/
offset &= 0xFFF;
- SET32(gpu_ram_8, offset, data);//*/
+ SET32(gpu_ram_8, offset, data);
return;
}
// else if ((offset >= GPU_CONTROL_RAM_BASE) && (offset < GPU_CONTROL_RAM_BASE+0x20))
// JaguarWriteWord(offset, (data >> 16) & 0xFFFF, who);
// JaguarWriteWord(offset+2, data & 0xFFFF, who);
+// We're a 32-bit processor, we can do a long write...!
JaguarWriteLong(offset, data, who);
}
void gpu_init(void)
{
memory_malloc_secure((void **)&gpu_ram_8, 0x1000, "GPU work RAM");
-// memory_malloc_secure((void **)&gpu_reg, 32*sizeof(int32), "GPU bank 0 regs");
-// memory_malloc_secure((void **)&gpu_alternate_reg, 32*sizeof(int32), "GPU bank 1 regs");
memory_malloc_secure((void **)&gpu_reg_bank_0, 32 * sizeof(int32), "GPU bank 0 regs");
memory_malloc_secure((void **)&gpu_reg_bank_1, 32 * sizeof(int32), "GPU bank 1 regs");
WriteLog("\n");
memory_free(gpu_ram_8);
+ memory_free(gpu_reg_bank_0);
+ memory_free(gpu_reg_bank_1);
}
//
while (cycles > 0 && GPU_RUNNING)
{
+if (gpu_ram_8[0x054] == 0x98 && gpu_ram_8[0x055] == 0x0A && gpu_ram_8[0x056] == 0x03
+ && gpu_ram_8[0x057] == 0x00 && gpu_ram_8[0x058] == 0x00 && gpu_ram_8[0x059] == 0x00)
+{
+ if (gpu_pc == 0xF03000)
+ {
+ extern uint32 starCount;
+ starCount = 0;
+/* WriteLog("GPU: Starting starfield generator... Dump of [R03=%08X]:\n", gpu_reg_bank_0[03]);
+ uint32 base = gpu_reg_bank_0[3];
+ for(uint32 i=0; i<0x100; i+=16)
+ {
+ WriteLog("%02X: ", i);
+ for(uint32 j=0; j<16; j++)
+ {
+ WriteLog("%02X ", JaguarReadByte(base + i + j));
+ }
+ WriteLog("\n");
+ }*/
+ }
+// if (gpu_pc == 0xF03)
+ {
+ }
+}//*/
+/*if (gpu_pc == 0xF03B9E && gpu_reg_bank_0[01] == 0)
+{
+ GPUDumpRegisters();
+ WriteLog("GPU: Starting disassembly log...\n");
+ doGPUDis = true;
+}//*/
/*if (gpu_pc == 0xF0359A)
{
doGPUDis = true;
UINT32 res = RN - RM - gpu_flag_c;
UINT32 borrow = gpu_flag_c;
// SET_ZNC_SUB(RN, RM, res); //???BUG??? YES!!!
- SET_ZNC_SUB(RN - borrow, RM, res);
+//No matter how you do it, there is a problem. With below, it's 0-0 with carry,
+//and the one below it it's FFFFFFFF - FFFFFFFF with carry... !!! FIX !!!
+// SET_ZNC_SUB(RN - borrow, RM, res);
+ SET_ZNC_SUB(RN, RM + borrow, res);
RN = res;
#ifdef GPU_DIS_SUBC
if (doGPUDis)
WriteLog("[NCZ:%u%u%u, R%02u=%08X, R%02u=%08X]\n", gpu_flag_n, gpu_flag_c, gpu_flag_z, IMM_1, RM, IMM_2, RN);
#endif
}
+/*
+N = 5, M = 3, 3 - 5 = -2, C = 1... Or, in our case:
+N = 0, M = 1, 0 - 1 = -1, C = 0!
+#define SET_C_SUB(a,b) (gpu_flag_c = ((UINT32)(b) > (UINT32)(a)))
+#define SET_ZN(r) SET_N(r); SET_Z(r)
+#define SET_ZNC_ADD(a,b,r) SET_N(r); SET_Z(r); SET_C_ADD(a,b)
+#define SET_ZNC_SUB(a,b,r) SET_N(r); SET_Z(r); SET_C_SUB(a,b)
+*/
static void gpu_opcode_subq(void)
{
#ifdef GPU_DIS_SUBQ
{
#ifdef GPU_DIS_MOVEPC
if (doGPUDis)
- WriteLog("%06X: MOVE PC, R%02u [NCZ:%u%u%u, PC=%08X, R%02u=%08X] -> ", gpu_pc-2, IMM_1, IMM_2, gpu_flag_n, gpu_flag_c, gpu_flag_z, gpu_pc-2, IMM_2, RN);
+ WriteLog("%06X: MOVE PC, R%02u [NCZ:%u%u%u, PC=%08X, R%02u=%08X] -> ", gpu_pc-2, IMM_2, gpu_flag_n, gpu_flag_c, gpu_flag_z, gpu_pc-2, IMM_2, RN);
#endif
// Should be previous PC--this might not always be previous instruction!
// Then again, this will point right at the *current* instruction, i.e., MOVE PC,R!
projects / virtualjaguar / blobdiff