pcsx2/pcsx2/GS.h

308 lines
7.7 KiB
C

/* PCSX2 - PS2 Emulator for PCs
* Copyright (C) 2002-2023 PCSX2 Dev Team
*
* PCSX2 is free software: you can redistribute it and/or modify it under the terms
* of the GNU Lesser General Public License as published by the Free Software Found-
* ation, either version 3 of the License, or (at your option) any later version.
*
* PCSX2 is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
* PURPOSE. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along with PCSX2.
* If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "Common.h"
#include "Gif.h"
#include "GS/GS.h"
#include "SingleRegisterTypes.h"
extern double GetVerticalFrequency();
alignas(16) extern u8 g_RealGSMem[Ps2MemSize::GSregs];
enum CSR_FifoState
{
CSR_FIFO_NORMAL = 0, // Somwhere in between (Neither empty or almost full).
CSR_FIFO_EMPTY, // Empty
CSR_FIFO_FULL, // Almost Full
CSR_FIFO_RESERVED // Reserved / Unused.
};
// --------------------------------------------------------------------------------------
// tGS_CSR
// --------------------------------------------------------------------------------------
// This is the Control Register for the GS. It is a dual-instance register that returns
// distinctly different values for most fields when read and written. In PCSX2 we house
// the written version in the gsRegs buffer, and generate the readback version on-demand
// from various other PCSX2 system statuses.
union tGS_CSR
{
struct
{
// Write:
// 0 - No action;
// 1 - Old event is cleared and event is enabled.
// Read:
// 0 - No SIGNAL pending.
// 1 - SIGNAL has been generated.
u64 SIGNAL : 1;
// Write:
// 0 - No action;
// 1 - FINISH event is enabled.
// Read:
// 0 - No FINISH event pending.
// 1 - FINISH event has been generated.
u64 FINISH : 1;
// Hsync Interrupt Control
// Write:
// 0 - No action;
// 1 - Hsync interrupt is enabled.
// Read:
// 0 - No Hsync interrupt pending.
// 1 - Hsync interrupt has been generated.
u64 HSINT : 1;
// Vsync Interrupt Control
// Write:
// 0 - No action;
// 1 - Vsync interrupt is enabled.
// Read:
// 0 - No Vsync interrupt pending.
// 1 - Vsync interrupt has been generated.
u64 VSINT : 1;
// Rect Area Write Termination Control
// 0 - No action;
// 1 - Rect area write interrupt is enabled.
// Read:
// 0 - No RAWrite interrupt pending.
// 1 - RAWrite interrupt has been generated.
u64 EDWINT : 1;
u64 _zero1 : 1;
u64 _zero2 : 1;
u64 pad1 : 1;
// FLUSH (write-only!)
// Write:
// 0 - Resume drawing if suspended (?)
// 1 - Flush the GS FIFO and suspend drawing
// Read: Always returns 0. (?)
u64 FLUSH : 1;
// RESET (write-only!)
// Write:
// 0 - Do nothing.
// 1 - GS soft system reset. Clears FIFOs and resets IMR to all 1's.
// (PCSX2 implementation also clears GIFpaths, though that behavior may differ on real HW).
// Read: Always returns 0. (?)
u64 RESET : 1;
u64 _pad2 : 2;
// (I have no idea what this reg is-- air)
// Output value is updated by sampling the VSync. (?)
u64 NFIELD : 1;
// Current Field of Display [page flipping] (read-only?)
// 0 - EVEN
// 1 - ODD
u64 FIELD : 1;
// GS FIFO Status (read-only)
// 00 - Somewhere in between
// 01 - Empty
// 10 - Almost Full
// 11 - Reserved (unused)
// Assign values using the CSR_FifoState enum.
u64 FIFO : 2;
// Revision number of the GS (fairly arbitrary)
u64 REV : 8;
// ID of the GS (also fairly arbitrary)
u64 ID : 8;
};
u64 _u64;
struct
{
u32 _u32; // lower 32 bits (all useful content!)
u32 _unused32; // upper 32 bits (unused -- should probably be 0)
};
void SwapField()
{
_u32 ^= 0x2000;
}
void SetField()
{
_u32 |= 0x2000;
}
void Reset()
{
FIFO = CSR_FIFO_EMPTY;
REV = 0x1B; // GS Revision
ID = 0x55; // GS ID
}
bool HasAnyInterrupts() const { return (SIGNAL || FINISH || HSINT || VSINT || EDWINT); }
u32 GetInterruptMask() const
{
return _u32 & 0x1f;
}
void SetAllInterrupts(bool value = true)
{
SIGNAL = FINISH = HSINT = VSINT = EDWINT = value;
}
tGS_CSR(u64 val) { _u64 = val; }
tGS_CSR(u32 val) { _u32 = val; }
tGS_CSR() { Reset(); }
};
// --------------------------------------------------------------------------------------
// tGS_IMR
// --------------------------------------------------------------------------------------
union tGS_IMR
{
struct
{
u32 _reserved1 : 8;
u32 SIGMSK : 1; // Signal evevnt interrupt mask
u32 FINISHMSK : 1; // Finish event interrupt mask
u32 HSMSK : 1; // HSync interrupt mask
u32 VSMSK : 1; // VSync interrupt mask
u32 EDWMSK : 1; // Rectangle write termination interrupt mask
u32 _undefined : 2; // undefined bits should be set to 1.
u32 _reserved2 : 17;
};
u32 _u32;
void reset()
{
_u32 = 0;
SIGMSK = FINISHMSK = HSMSK = VSMSK = EDWMSK = true;
_undefined = 0x3;
}
void set(u32 value)
{
_u32 = (value & 0x1f00); // Set only the interrupt mask fields.
_undefined = 0x3; // These should always be set.
}
bool masked() const { return (SIGMSK || FINISHMSK || HSMSK || VSMSK || EDWMSK); }
};
// --------------------------------------------------------------------------------------
// GSRegSMODE1
// --------------------------------------------------------------------------------------
// Previously, the union was used to get the CMOD bit of the SMODE1 register
// Commenting it out as it's unused right now. (Might potentially be useful in the future)
//union GSRegSMODE1
//{
// struct
// {
// u32 RC : 3;
// u32 LC : 7;
// u32 T1248 : 2;
// u32 SLCK : 1;
// u32 CMOD : 2;
// u32 EX : 1;
// u32 PRST : 1;
// u32 SINT : 1;
// u32 XPCK : 1;
// u32 PCK2 : 2;
// u32 SPML : 4;
// u32 GCONT : 1;
// u32 PHS : 1;
// u32 PVS : 1;
// u32 PEHS : 1;
// u32 PEVS : 1;
// u32 CLKSEL : 2;
// u32 NVCK : 1;
// u32 SLCK2 : 1;
// u32 VCKSEL : 2;
// u32 VHP : 1;
// u32 _PAD1 : 27;
// };
//
// u64 SMODE1;
//};
// --------------------------------------------------------------------------------------
// GSRegSIGBLID
// --------------------------------------------------------------------------------------
struct GSRegSIGBLID
{
u32 SIGID;
u32 LBLID;
};
#define PS2MEM_GS g_RealGSMem
#define PS2GS_BASE(mem) (PS2MEM_GS + (mem & 0x13ff))
#define CSRreg ((tGS_CSR&)*(PS2MEM_GS + 0x1000))
#define GSCSRr ((u32&)*(PS2MEM_GS + 0x1000))
#define GSIMR ((tGS_IMR&)*(PS2MEM_GS + 0x1010))
#define GSSIGLBLID ((GSRegSIGBLID&)*(PS2MEM_GS + 0x1080))
enum class GS_VideoMode : int
{
Uninitialized,
Unknown,
NTSC,
PAL,
VESA,
SDTV_480P,
SDTV_576P,
HDTV_720P,
HDTV_1080I,
HDTV_1080P,
DVD_NTSC,
DVD_PAL
};
extern GS_VideoMode gsVideoMode;
extern bool gsIsInterlaced;
/////////////////////////////////////////////////////////////////////////////
// Generalized GS Functions and Stuff
extern void gsReset();
extern void gsSetVideoMode(GS_VideoMode mode);
extern void gsPostVsyncStart();
extern void gsWrite8(u32 mem, u8 value);
extern void gsWrite16(u32 mem, u16 value);
extern void gsWrite32(u32 mem, u32 value);
extern void gsWrite64_page_00(u32 mem, u64 value);
extern void gsWrite64_page_01(u32 mem, u64 value);
extern void gsWrite64_generic(u32 mem, u64 value);
extern void TAKES_R128 gsWrite128_page_00(u32 mem, r128 value);
extern void TAKES_R128 gsWrite128_page_01(u32 mem, r128 value);
extern void TAKES_R128 gsWrite128_generic(u32 mem, r128 value);
extern u8 gsRead8(u32 mem);
extern u16 gsRead16(u32 mem);
extern u32 gsRead32(u32 mem);
extern u64 gsRead64(u32 mem);
extern u128 gsNonMirroredRead(u32 mem);
void gsIrq();
extern tGS_CSR CSRr;