bool FifoCommandRunnable()
{
u32 buffer_size = (u32)(GetVideoBufferEndPtr() - g_pVideoData);
if (buffer_size == 0)
return false; // can't peek
u8 cmd_byte = DataPeek8(0);
u32 command_size = 0;
switch (cmd_byte)
{
case GX_NOP: // Hm, this means that we scan over nop streams pretty slowly...
case GX_CMD_INVL_VC: // Invalidate Vertex Cache - no parameters
case GX_CMD_UNKNOWN_METRICS: // zelda 4 swords calls it and checks the metrics registers after that
command_size = 1;
break;
case GX_LOAD_BP_REG:
command_size = 5;
break;
case GX_LOAD_CP_REG:
command_size = 6;
break;
case GX_LOAD_INDX_A:
case GX_LOAD_INDX_B:
case GX_LOAD_INDX_C:
case GX_LOAD_INDX_D:
command_size = 5;
break;
case GX_CMD_CALL_DL:
command_size = 9;
break;
case GX_LOAD_XF_REG:
{
// check if we can read the header
if (buffer_size >= 5)
{
command_size = 1 + 4;
u32 Cmd2 = DataPeek32(1);
int transfer_size = ((Cmd2 >> 16) & 15) + 1;
command_size += transfer_size * 4;
}
else
{
return false;
}
}
u32 FifoCommandRunnable(u32 &command_size)
{
u32 cycleTime = 0;
u32 buffer_size = (u32)(GetVideoBufferEndPtr() - g_pVideoData);
if (buffer_size == 0)
return 0; // can't peek
u8 cmd_byte = DataPeek8(0);
switch (cmd_byte)
{
case GX_NOP: // Hm, this means that we scan over nop streams pretty slowly...
command_size = 1;
cycleTime = 6;
break;
case GX_CMD_INVL_VC: // Invalidate Vertex Cache - no parameters
command_size = 1;
cycleTime = 6;
break;
case GX_CMD_UNKNOWN_METRICS: // zelda 4 swords calls it and checks the metrics registers after that
command_size = 1;
cycleTime = 6;
break;
case GX_LOAD_BP_REG:
command_size = 5;
cycleTime = 12;
break;
case GX_LOAD_CP_REG:
command_size = 6;
cycleTime = 12;
break;
case GX_LOAD_INDX_A:
case GX_LOAD_INDX_B:
case GX_LOAD_INDX_C:
case GX_LOAD_INDX_D:
command_size = 5;
cycleTime = 6; // TODO
break;
case GX_CMD_CALL_DL:
{
// FIXME: Calculate the cycle time of the display list.
//u32 address = DataPeek32(1);
//u32 size = DataPeek32(5);
//u8* old_pVideoData = g_pVideoData;
//u8* startAddress = Memory::GetPointer(address);
//// Avoid the crash if Memory::GetPointer failed ..
//if (startAddress != 0)
//{
// g_pVideoData = startAddress;
// u8 *end = g_pVideoData + size;
// u32 step = 0;
// while (g_pVideoData < end)
// {
// cycleTime += FifoCommandRunnable(step);
// g_pVideoData += step;
// }
//}
//else
//{
// cycleTime = 45;
//}
//// reset to the old pointer
//g_pVideoData = old_pVideoData;
command_size = 9;
cycleTime = 45; // This is unverified
}
break;
case GX_LOAD_XF_REG:
{
// check if we can read the header
if (buffer_size >= 5)
{
command_size = 1 + 4;
u32 Cmd2 = DataPeek32(1);
int transfer_size = ((Cmd2 >> 16) & 15) + 1;
command_size += transfer_size * 4;
cycleTime = 18 + 6 * transfer_size;
}
else
{
return 0;
}
}
