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dolphin/Source/Core/Core/HW/VideoInterface.cpp
Léo Lam b2c41cec0a Config: Include SYSCONF in base layer 
Settings that come from the SYSCONF are now included in Dolphin's
config system as part of the base layer. They are handled in a
special way compared to other settings to make sure they are only
loaded from and saved to the SYSCONF (to avoid different, possibly
contradicting sources of truth).
2017-08-11 15:36:31 +08:00

779 lines
29 KiB
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// Copyright 2008 Dolphin Emulator Project
// Licensed under GPLv2+
// Refer to the license.txt file included.
#include "Core/HW/VideoInterface.h"
#include <array>
#include <cmath>
#include <cstddef>
#include "Common/ChunkFile.h"
#include "Common/CommonTypes.h"
#include "Common/Config/Config.h"
#include "Common/Logging/Log.h"
#include "Common/MathUtil.h"
#include "Core/Config/SYSCONFSettings.h"
#include "Core/ConfigManager.h"
#include "Core/Core.h"
#include "Core/CoreTiming.h"
#include "Core/HW/MMIO.h"
#include "Core/HW/ProcessorInterface.h"
#include "Core/HW/SI/SI.h"
#include "Core/HW/SystemTimers.h"
#include "DiscIO/Enums.h"
#include "VideoCommon/VideoBackendBase.h"
#include "VideoCommon/VideoConfig.h"
namespace VideoInterface
{
// STATE_TO_SAVE
// Registers listed in order:
static UVIVerticalTimingRegister m_VerticalTimingRegister;
static UVIDisplayControlRegister m_DisplayControlRegister;
static UVIHorizontalTiming0 m_HTiming0;
static UVIHorizontalTiming1 m_HTiming1;
static UVIVBlankTimingRegister m_VBlankTimingOdd;
static UVIVBlankTimingRegister m_VBlankTimingEven;
static UVIBurstBlankingRegister m_BurstBlankingOdd;
static UVIBurstBlankingRegister m_BurstBlankingEven;
static UVIFBInfoRegister m_XFBInfoTop;
static UVIFBInfoRegister m_XFBInfoBottom;
static UVIFBInfoRegister m_3DFBInfoTop; // Start making your stereoscopic demos! :p
static UVIFBInfoRegister m_3DFBInfoBottom;
static std::array<UVIInterruptRegister, 4> m_InterruptRegister;
static std::array<UVILatchRegister, 2> m_LatchRegister;
static PictureConfigurationRegister m_PictureConfiguration;
static UVIHorizontalScaling m_HorizontalScaling;
static SVIFilterCoefTables m_FilterCoefTables;
static u32 m_UnkAARegister = 0; // ??? 0x00FF0000
static u16 m_Clock = 0; // 0: 27MHz, 1: 54MHz
static UVIDTVStatus m_DTVStatus;
static UVIHorizontalStepping m_FBWidth; // Only correct when scaling is enabled?
static UVIBorderBlankRegister m_BorderHBlank;
// 0xcc002076 - 0xcc00207f is full of 0x00FF: unknown
// 0xcc002080 - 0xcc002100 even more unknown
static u32 s_target_refresh_rate = 0;
static constexpr std::array<u32, 2> s_clock_freqs{{
27000000, 54000000,
}};
static u64 s_ticks_last_line_start; // number of ticks when the current full scanline started
static u32 s_half_line_count; // number of halflines that have occurred for this full frame
static u32 s_half_line_of_next_si_poll; // halfline when next SI poll results should be available
static constexpr u32 num_half_lines_for_si_poll = (7 * 2) + 1; // this is how long an SI poll takes
static FieldType s_current_field;
// below indexes are 1-based
static u32 s_even_field_first_hl; // index first halfline of the even field
static u32 s_odd_field_first_hl; // index first halfline of the odd field
static u32 s_even_field_last_hl; // index last halfline of the even field
static u32 s_odd_field_last_hl; // index last halfline of the odd field
void DoState(PointerWrap& p)
{
p.DoPOD(m_VerticalTimingRegister);
p.DoPOD(m_DisplayControlRegister);
p.Do(m_HTiming0);
p.Do(m_HTiming1);
p.Do(m_VBlankTimingOdd);
p.Do(m_VBlankTimingEven);
p.Do(m_BurstBlankingOdd);
p.Do(m_BurstBlankingEven);
p.Do(m_XFBInfoTop);
p.Do(m_XFBInfoBottom);
p.Do(m_3DFBInfoTop);
p.Do(m_3DFBInfoBottom);
p.DoArray(m_InterruptRegister);
p.DoArray(m_LatchRegister);
p.Do(m_PictureConfiguration);
p.DoPOD(m_HorizontalScaling);
p.Do(m_FilterCoefTables);
p.Do(m_UnkAARegister);
p.Do(m_Clock);
p.Do(m_DTVStatus);
p.Do(m_FBWidth);
p.Do(m_BorderHBlank);
p.Do(s_target_refresh_rate);
p.Do(s_ticks_last_line_start);
p.Do(s_half_line_count);
p.Do(s_half_line_of_next_si_poll);
p.Do(s_current_field);
p.Do(s_even_field_first_hl);
p.Do(s_odd_field_first_hl);
p.Do(s_even_field_last_hl);
p.Do(s_odd_field_last_hl);
}
// Executed after Init, before game boot
void Preset(bool _bNTSC)
{
// NOTE: Make sure all registers are set to the correct initial state. The
// variables are not going to start zeroed if another game has been run
// previously (and mutated everything).
m_VerticalTimingRegister.EQU = 6;
m_VerticalTimingRegister.ACV = 0;
m_DisplayControlRegister.ENB = 1;
m_DisplayControlRegister.RST = 0;
m_DisplayControlRegister.NIN = 0;
m_DisplayControlRegister.DLR = 0;
m_DisplayControlRegister.LE0 = 0;
m_DisplayControlRegister.LE1 = 0;
m_DisplayControlRegister.FMT = _bNTSC ? 0 : 1;
m_HTiming0.HLW = 429;
m_HTiming0.HCE = 105;
m_HTiming0.HCS = 71;
m_HTiming1.HSY = 64;
m_HTiming1.HBE640 = 162;
m_HTiming1.HBS640 = 373;
m_VBlankTimingOdd.PRB = 502;
m_VBlankTimingOdd.PSB = 5;
m_VBlankTimingEven.PRB = 503;
m_VBlankTimingEven.PSB = 4;
m_BurstBlankingOdd.BS0 = 12;
m_BurstBlankingOdd.BE0 = 520;
m_BurstBlankingOdd.BS2 = 12;
m_BurstBlankingOdd.BE2 = 520;
m_BurstBlankingEven.BS0 = 13;
m_BurstBlankingEven.BE0 = 519;
m_BurstBlankingEven.BS2 = 13;
m_BurstBlankingEven.BE2 = 519;
m_XFBInfoTop.Hex = 0;
m_XFBInfoBottom.Hex = 0;
m_3DFBInfoTop.Hex = 0;
m_3DFBInfoBottom.Hex = 0;
m_InterruptRegister[0].HCT = 430;
m_InterruptRegister[0].VCT = 263;
m_InterruptRegister[0].IR_MASK = 1;
m_InterruptRegister[0].IR_INT = 0;
m_InterruptRegister[1].HCT = 1;
m_InterruptRegister[1].VCT = 1;
m_InterruptRegister[1].IR_MASK = 1;
m_InterruptRegister[1].IR_INT = 0;
m_InterruptRegister[2].Hex = 0;
m_InterruptRegister[3].Hex = 0;
m_LatchRegister = {};
m_PictureConfiguration.STD = 40;
m_PictureConfiguration.WPL = 40;
m_HorizontalScaling.Hex = 0;
m_FilterCoefTables = {};
m_UnkAARegister = 0;
DiscIO::Region region = SConfig::GetInstance().m_region;
// 54MHz, capable of progressive scan
m_Clock = DiscIO::IsNTSC(region);
// Say component cable is plugged
m_DTVStatus.component_plugged = Config::Get(Config::SYSCONF_PROGRESSIVE_SCAN);
m_DTVStatus.ntsc_j = SConfig::GetInstance().bForceNTSCJ || region == DiscIO::Region::NTSC_J;
m_FBWidth.Hex = 0;
m_BorderHBlank.Hex = 0;
s_ticks_last_line_start = 0;
s_half_line_count = 1;
s_half_line_of_next_si_poll = num_half_lines_for_si_poll; // first sampling starts at vsync
s_current_field = FieldType::Odd;
UpdateParameters();
}
void Init()
{
Preset(true);
}
void RegisterMMIO(MMIO::Mapping* mmio, u32 base)
{
struct MappedVar
{
u32 addr;
u16* ptr;
};
std::array<MappedVar, 46> directly_mapped_vars{{
{VI_VERTICAL_TIMING, &m_VerticalTimingRegister.Hex},
{VI_HORIZONTAL_TIMING_0_HI, &m_HTiming0.Hi},
{VI_HORIZONTAL_TIMING_0_LO, &m_HTiming0.Lo},
{VI_HORIZONTAL_TIMING_1_HI, &m_HTiming1.Hi},
{VI_HORIZONTAL_TIMING_1_LO, &m_HTiming1.Lo},
{VI_VBLANK_TIMING_ODD_HI, &m_VBlankTimingOdd.Hi},
{VI_VBLANK_TIMING_ODD_LO, &m_VBlankTimingOdd.Lo},
{VI_VBLANK_TIMING_EVEN_HI, &m_VBlankTimingEven.Hi},
{VI_VBLANK_TIMING_EVEN_LO, &m_VBlankTimingEven.Lo},
{VI_BURST_BLANKING_ODD_HI, &m_BurstBlankingOdd.Hi},
{VI_BURST_BLANKING_ODD_LO, &m_BurstBlankingOdd.Lo},
{VI_BURST_BLANKING_EVEN_HI, &m_BurstBlankingEven.Hi},
{VI_BURST_BLANKING_EVEN_LO, &m_BurstBlankingEven.Lo},
{VI_FB_LEFT_TOP_LO, &m_XFBInfoTop.Lo},
{VI_FB_RIGHT_TOP_LO, &m_3DFBInfoTop.Lo},
{VI_FB_LEFT_BOTTOM_LO, &m_XFBInfoBottom.Lo},
{VI_FB_RIGHT_BOTTOM_LO, &m_3DFBInfoBottom.Lo},
{VI_PRERETRACE_LO, &m_InterruptRegister[0].Lo},
{VI_POSTRETRACE_LO, &m_InterruptRegister[1].Lo},
{VI_DISPLAY_INTERRUPT_2_LO, &m_InterruptRegister[2].Lo},
{VI_DISPLAY_INTERRUPT_3_LO, &m_InterruptRegister[3].Lo},
{VI_DISPLAY_LATCH_0_HI, &m_LatchRegister[0].Hi},
{VI_DISPLAY_LATCH_0_LO, &m_LatchRegister[0].Lo},
{VI_DISPLAY_LATCH_1_HI, &m_LatchRegister[1].Hi},
{VI_DISPLAY_LATCH_1_LO, &m_LatchRegister[1].Lo},
{VI_HSCALEW, &m_PictureConfiguration.Hex},
{VI_HSCALER, &m_HorizontalScaling.Hex},
{VI_FILTER_COEF_0_HI, &m_FilterCoefTables.Tables02[0].Hi},
{VI_FILTER_COEF_0_LO, &m_FilterCoefTables.Tables02[0].Lo},
{VI_FILTER_COEF_1_HI, &m_FilterCoefTables.Tables02[1].Hi},
{VI_FILTER_COEF_1_LO, &m_FilterCoefTables.Tables02[1].Lo},
{VI_FILTER_COEF_2_HI, &m_FilterCoefTables.Tables02[2].Hi},
{VI_FILTER_COEF_2_LO, &m_FilterCoefTables.Tables02[2].Lo},
{VI_FILTER_COEF_3_HI, &m_FilterCoefTables.Tables36[0].Hi},
{VI_FILTER_COEF_3_LO, &m_FilterCoefTables.Tables36[0].Lo},
{VI_FILTER_COEF_4_HI, &m_FilterCoefTables.Tables36[1].Hi},
{VI_FILTER_COEF_4_LO, &m_FilterCoefTables.Tables36[1].Lo},
{VI_FILTER_COEF_5_HI, &m_FilterCoefTables.Tables36[2].Hi},
{VI_FILTER_COEF_5_LO, &m_FilterCoefTables.Tables36[2].Lo},
{VI_FILTER_COEF_6_HI, &m_FilterCoefTables.Tables36[3].Hi},
{VI_FILTER_COEF_6_LO, &m_FilterCoefTables.Tables36[3].Lo},
{VI_CLOCK, &m_Clock},
{VI_DTV_STATUS, &m_DTVStatus.Hex},
{VI_FBWIDTH, &m_FBWidth.Hex},
{VI_BORDER_BLANK_END, &m_BorderHBlank.Lo},
{VI_BORDER_BLANK_START, &m_BorderHBlank.Hi},
}};
// Declare all the boilerplate direct MMIOs.
for (auto& mapped_var : directly_mapped_vars)
{
mmio->Register(base | mapped_var.addr, MMIO::DirectRead<u16>(mapped_var.ptr),
MMIO::DirectWrite<u16>(mapped_var.ptr));
}
std::array<MappedVar, 8> update_params_on_read_vars{{
{VI_VERTICAL_TIMING, &m_VerticalTimingRegister.Hex},
{VI_HORIZONTAL_TIMING_0_HI, &m_HTiming0.Hi},
{VI_HORIZONTAL_TIMING_0_LO, &m_HTiming0.Lo},
{VI_VBLANK_TIMING_ODD_HI, &m_VBlankTimingOdd.Hi},
{VI_VBLANK_TIMING_ODD_LO, &m_VBlankTimingOdd.Lo},
{VI_VBLANK_TIMING_EVEN_HI, &m_VBlankTimingEven.Hi},
{VI_VBLANK_TIMING_EVEN_LO, &m_VBlankTimingEven.Lo},
{VI_CLOCK, &m_Clock},
}};
// Declare all the MMIOs that update timing params.
for (auto& mapped_var : update_params_on_read_vars)
{
mmio->Register(base | mapped_var.addr, MMIO::DirectRead<u16>(mapped_var.ptr),
MMIO::ComplexWrite<u16>([mapped_var](u32, u16 val) {
*mapped_var.ptr = val;
UpdateParameters();
}));
}
// XFB related MMIOs that require special handling on writes.
mmio->Register(base | VI_FB_LEFT_TOP_HI, MMIO::DirectRead<u16>(&m_XFBInfoTop.Hi),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
m_XFBInfoTop.Hi = val;
if (m_XFBInfoTop.CLRPOFF)
m_XFBInfoTop.POFF = 0;
}));
mmio->Register(base | VI_FB_LEFT_BOTTOM_HI, MMIO::DirectRead<u16>(&m_XFBInfoBottom.Hi),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
m_XFBInfoBottom.Hi = val;
if (m_XFBInfoBottom.CLRPOFF)
m_XFBInfoBottom.POFF = 0;
}));
mmio->Register(base | VI_FB_RIGHT_TOP_HI, MMIO::DirectRead<u16>(&m_3DFBInfoTop.Hi),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
m_3DFBInfoTop.Hi = val;
if (m_3DFBInfoTop.CLRPOFF)
m_3DFBInfoTop.POFF = 0;
}));
mmio->Register(base | VI_FB_RIGHT_BOTTOM_HI, MMIO::DirectRead<u16>(&m_3DFBInfoBottom.Hi),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
m_3DFBInfoBottom.Hi = val;
if (m_3DFBInfoBottom.CLRPOFF)
m_3DFBInfoBottom.POFF = 0;
}));
// MMIOs with unimplemented writes that trigger warnings.
mmio->Register(
base | VI_VERTICAL_BEAM_POSITION,
MMIO::ComplexRead<u16>([](u32) { return 1 + (s_half_line_count - 1) / 2; }),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
WARN_LOG(VIDEOINTERFACE,
"Changing vertical beam position to 0x%04x - not documented or implemented yet",
val);
}));
mmio->Register(
base | VI_HORIZONTAL_BEAM_POSITION, MMIO::ComplexRead<u16>([](u32) {
u16 value =
static_cast<u16>(1 +
m_HTiming0.HLW * (CoreTiming::GetTicks() - s_ticks_last_line_start) /
(GetTicksPerHalfLine()));
return MathUtil::Clamp(value, static_cast<u16>(1), static_cast<u16>(m_HTiming0.HLW * 2));
}),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
WARN_LOG(VIDEOINTERFACE,
"Changing horizontal beam position to 0x%04x - not documented or implemented yet",
val);
}));
// The following MMIOs are interrupts related and update interrupt status
// on writes.
mmio->Register(base | VI_PRERETRACE_HI, MMIO::DirectRead<u16>(&m_InterruptRegister[0].Hi),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
m_InterruptRegister[0].Hi = val;
UpdateInterrupts();
}));
mmio->Register(base | VI_POSTRETRACE_HI, MMIO::DirectRead<u16>(&m_InterruptRegister[1].Hi),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
m_InterruptRegister[1].Hi = val;
UpdateInterrupts();
}));
mmio->Register(base | VI_DISPLAY_INTERRUPT_2_HI,
MMIO::DirectRead<u16>(&m_InterruptRegister[2].Hi),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
m_InterruptRegister[2].Hi = val;
UpdateInterrupts();
}));
mmio->Register(base | VI_DISPLAY_INTERRUPT_3_HI,
MMIO::DirectRead<u16>(&m_InterruptRegister[3].Hi),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
m_InterruptRegister[3].Hi = val;
UpdateInterrupts();
}));
// Unknown anti-aliasing related MMIO register: puts a warning on log and
// needs to shift/mask when reading/writing.
mmio->Register(base | VI_UNK_AA_REG_HI,
MMIO::ComplexRead<u16>([](u32) { return m_UnkAARegister >> 16; }),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
m_UnkAARegister = (m_UnkAARegister & 0x0000FFFF) | ((u32)val << 16);
WARN_LOG(VIDEOINTERFACE, "Writing to the unknown AA register (hi)");
}));
mmio->Register(base | VI_UNK_AA_REG_LO,
MMIO::ComplexRead<u16>([](u32) { return m_UnkAARegister & 0xFFFF; }),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
m_UnkAARegister = (m_UnkAARegister & 0xFFFF0000) | val;
WARN_LOG(VIDEOINTERFACE, "Writing to the unknown AA register (lo)");
}));
// Control register writes only updates some select bits, and additional
// processing needs to be done if a reset is requested.
mmio->Register(base | VI_CONTROL_REGISTER, MMIO::DirectRead<u16>(&m_DisplayControlRegister.Hex),
MMIO::ComplexWrite<u16>([](u32, u16 val) {
UVIDisplayControlRegister tmpConfig(val);
m_DisplayControlRegister.ENB = tmpConfig.ENB;
m_DisplayControlRegister.NIN = tmpConfig.NIN;
m_DisplayControlRegister.DLR = tmpConfig.DLR;
m_DisplayControlRegister.LE0 = tmpConfig.LE0;
m_DisplayControlRegister.LE1 = tmpConfig.LE1;
m_DisplayControlRegister.FMT = tmpConfig.FMT;
if (tmpConfig.RST)
{
// shuffle2 clear all data, reset to default vals, and enter idle mode
m_DisplayControlRegister.RST = 0;
m_InterruptRegister = {};
UpdateInterrupts();
}
UpdateParameters();
}));
// Map 8 bit reads (not writes) to 16 bit reads.
for (int i = 0; i < 0x1000; i += 2)
{
mmio->Register(base | i, MMIO::ReadToLarger<u8>(mmio, base | i, 8), MMIO::InvalidWrite<u8>());
mmio->Register(base | (i + 1), MMIO::ReadToLarger<u8>(mmio, base | i, 0),
MMIO::InvalidWrite<u8>());
}
// Map 32 bit reads and writes to 16 bit reads and writes.
for (int i = 0; i < 0x1000; i += 4)
{
mmio->Register(base | i, MMIO::ReadToSmaller<u32>(mmio, base | i, base | (i + 2)),
MMIO::WriteToSmaller<u32>(mmio, base | i, base | (i + 2)));
}
}
void UpdateInterrupts()
{
if ((m_InterruptRegister[0].IR_INT && m_InterruptRegister[0].IR_MASK) ||
(m_InterruptRegister[1].IR_INT && m_InterruptRegister[1].IR_MASK) ||
(m_InterruptRegister[2].IR_INT && m_InterruptRegister[2].IR_MASK) ||
(m_InterruptRegister[3].IR_INT && m_InterruptRegister[3].IR_MASK))
{
ProcessorInterface::SetInterrupt(ProcessorInterface::INT_CAUSE_VI, true);
}
else
{
ProcessorInterface::SetInterrupt(ProcessorInterface::INT_CAUSE_VI, false);
}
}
u32 GetXFBAddressTop()
{
if (m_XFBInfoTop.POFF)
return m_XFBInfoTop.FBB << 5;
else
return m_XFBInfoTop.FBB;
}
u32 GetXFBAddressBottom()
{
// POFF for XFB bottom is connected to POFF for XFB top
if (m_XFBInfoTop.POFF)
return m_XFBInfoBottom.FBB << 5;
else
return m_XFBInfoBottom.FBB;
}
static u32 GetHalfLinesPerEvenField()
{
return (3 * m_VerticalTimingRegister.EQU + m_VBlankTimingEven.PRB +
2 * m_VerticalTimingRegister.ACV + m_VBlankTimingEven.PSB);
}
static u32 GetHalfLinesPerOddField()
{
return (3 * m_VerticalTimingRegister.EQU + m_VBlankTimingOdd.PRB +
2 * m_VerticalTimingRegister.ACV + m_VBlankTimingOdd.PSB);
}
static u32 GetTicksPerEvenField()
{
return GetTicksPerHalfLine() * GetHalfLinesPerEvenField();
}
static u32 GetTicksPerOddField()
{
return GetTicksPerHalfLine() * GetHalfLinesPerOddField();
}
// Get the aspect ratio of VI's active area.
float GetAspectRatio()
{
// The picture of a PAL/NTSC TV signal is defined to have a 4:3 aspect ratio,
// but it's only 4:3 if the picture fill the entire active area.
// All games configure VideoInterface to add padding in both the horizontal and vertical
// directions and most games also do a slight horizontal scale.
// This means that XFB never fills the entire active area and is therefor almost never 4:3
// To work out the correct aspect ratio of the XFB, we need to know how VideoInterface's
// currently configured active area compares to the active area of a stock PAL or NTSC
// signal (which would be 4:3)
// This function only deals with standard aspect ratios. For widescreen aspect ratios,
// multiply the result by 1.33333..
// 1. Get our active area in BT.601 samples (more or less pixels)
int active_lines = m_VerticalTimingRegister.ACV;
int active_width_samples = (m_HTiming0.HLW + m_HTiming1.HBS640 - m_HTiming1.HBE640);
// 2. TVs are analog and don't have pixels. So we convert to seconds.
float tick_length = (1.0f / SystemTimers::GetTicksPerSecond());
float vertical_period = tick_length * GetTicksPerField();
float horizontal_period = tick_length * GetTicksPerHalfLine() * 2;
float vertical_active_area = active_lines * horizontal_period;
float horizontal_active_area = tick_length * GetTicksPerSample() * active_width_samples;
// We are approximating the horizontal/vertical flyback transformers that control the
// position of the electron beam on the screen. Our flyback transformers create a
// perfect Sawtooth wave, with a smooth rise and a fall that takes zero time.
// For more accurate emulation of video signals out of the 525 or 625 line standards,
// it might be necessary to emulate a less precise flyback transformer with more flaws.
// But those modes aren't officially supported by TVs anyway and could behave differently
// on different TVs.
// 3. Calculate the ratio of active time to total time for VI's active area
float vertical_active_ratio = vertical_active_area / vertical_period;
float horizontal_active_ratio = horizontal_active_area / horizontal_period;
// 4. And then scale the ratios to typical PAL/NTSC signals.
// NOTE: With the exception of selecting between PAL-M and NTSC color encoding on Brazilian
// GameCubes, the FMT field doesn't actually do anything on real hardware. But
// Nintendo's SDK always sets it appropriately to match the number of lines.
if (m_DisplayControlRegister.FMT == 1) // 625 line TV (PAL)
{
// PAL defines the horizontal active area as 52us of the 64us line.
// BT.470-6 defines the blanking period as 12.0us +0.0 -0.3 [table on page 5]
horizontal_active_ratio *= 64.0f / 52.0f;
// PAL defines the vertical active area as 576 of 625 lines.
vertical_active_ratio *= 625.0f / 576.0f;
// TODO: Should PAL60 games go through the 625 or 525 line codepath?
// The resulting aspect ratio is close, but not identical.
}
else // 525 line TV (NTSC or PAL-M)
{
// The NTSC standard doesn't define it's active area very well.
// The line is 63.55555..us long, which is derived from 1.001 / (30 * 525)
// but the blanking area is defined with a large amount of slack in the SMPTE 170M-2004
// standard, 10.7us +0.3 -0.2 [derived from table on page 9]
// The BT.470-6 standard provides a different number of 10.9us +/- 0.2 [table on page 5]
// This results in an active area between 52.5555us and 53.05555us
// Lots of different numbers float around the Internet including:
// * 52.655555.. us --
// http://web.archive.org/web/20140218044518/http://lipas.uwasa.fi/~f76998/video/conversion/
// * 52.66 us -- http://www.ni.com/white-paper/4750/en/
// * 52.6 us -- http://web.mit.edu/6.111/www/f2008/handouts/L12.pdf
//
// None of these website provide primary sources for their numbers, back in the days of
// analog, TV signal timings were not that precise to start with and it never got standardized
// during the move to digital.
// We are just going to use 52.655555.. as most other numbers on the Internet appear to be a
// simplification of it. 53.655555.. is a blanking period of 10.9us, matching the BT.470-6
// standard
// and within tolerance of the SMPTE 170M-2004 standard.
horizontal_active_ratio *= 63.555555f / 52.655555f;
// Even 486 active lines isn't completely agreed upon.
// Depending on how you count the two half lines you could get 485 or 484
vertical_active_ratio *= 525.0f / 486.0f;
}
// 5. Calculate the final ratio and scale to 4:3
float ratio = horizontal_active_ratio / vertical_active_ratio;
if (std::isnormal(
ratio)) // Check we have a sane ratio and haven't propagated any infs/nans/zeros
return ratio * (4.0f / 3.0f); // Scale to 4:3
else
return (4.0f / 3.0f); // VI isn't initialized correctly, just return 4:3 instead
}
// This function updates:
// a) the scanlines that are considered the 'active region' of each field
// b) the equivalent refresh rate for the current timing configuration
//
// Each pair of fields is laid out like:
// [typical values are for NTSC interlaced]
//
// <---------- one scanline width ---------->
// EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
// ... lines omitted, 9 total E scanlines
// ... is typical
// EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
// RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
// ... lines omitted, 12 total R scanlines
// ... is typical
// RRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
// AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
// ... lines omitted, 240 total A scanlines
// ... is typical
// AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA
// SSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS
// SSSSSSSSSSSSSSSSSSSSSeeeeeeeeeeeeeeeeeeeee
// eeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
// ... lines omitted, 9 total e scanlines
// ... is typical
// eeeeeeeeeeeeeeeeeeeeerrrrrrrrrrrrrrrrrrrrr
// rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
// ... lines omitted, 12.5 total r scanlines
// ... is typical
// rrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr
// aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
// ... line omitted, 240 total a scanlines
// ... is typical
// aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
// ssssssssssssssssssssssssssssssssssssssssss
//
// Uppercase is field 1, lowercase is field 2
// E,e = pre-equ/vert-sync/post-equ
// = (m_VerticalTimingRegister.EQU*3) half-scanlines
// R,r = preblanking
// = (m_VBlankTimingX.PRB) half-scanlines
// A,a = active lines
// = (m_VerticalTimingRegister.ACV*2) half-scanlines
// S,s = postblanking
// = (m_VBlankTimingX.PSB) half-scanlines
//
// NB: for double-strike modes, the second field
// does not get offset by half a scanline
void UpdateParameters()
{
s_even_field_first_hl = 3 * m_VerticalTimingRegister.EQU + m_VBlankTimingEven.PRB + 1;
s_odd_field_first_hl =
GetHalfLinesPerEvenField() + 3 * m_VerticalTimingRegister.EQU + m_VBlankTimingOdd.PRB + 1;
s_even_field_last_hl = s_even_field_first_hl + m_VerticalTimingRegister.ACV * 2;
s_odd_field_last_hl = s_odd_field_first_hl + m_VerticalTimingRegister.ACV * 2;
s_target_refresh_rate = lround(2.0 * SystemTimers::GetTicksPerSecond() /
(GetTicksPerEvenField() + GetTicksPerOddField()));
}
u32 GetTargetRefreshRate()
{
return s_target_refresh_rate;
}
u32 GetTicksPerSample()
{
return 2 * SystemTimers::GetTicksPerSecond() / s_clock_freqs[m_Clock];
}
u32 GetTicksPerHalfLine()
{
return GetTicksPerSample() * m_HTiming0.HLW;
}
u32 GetTicksPerField()
{
return GetTicksPerEvenField();
}
static void LogField(FieldType field, u32 xfb_address)
{
static constexpr std::array<const char*, 2> field_type_names{{"Odd", "Even"}};
static const std::array<const UVIVBlankTimingRegister*, 2> vert_timing{{
&m_VBlankTimingOdd, &m_VBlankTimingEven,
}};
const auto field_index = static_cast<size_t>(field);
DEBUG_LOG(VIDEOINTERFACE, "(VI->BeginField): Address: %.08X | WPL %u | STD %u | EQ %u | PRB %u | "
"ACV %u | PSB %u | Field %s",
xfb_address, m_PictureConfiguration.WPL, m_PictureConfiguration.STD,
m_VerticalTimingRegister.EQU, vert_timing[field_index]->PRB,
m_VerticalTimingRegister.ACV, vert_timing[field_index]->PSB,
field_type_names[field_index]);
DEBUG_LOG(VIDEOINTERFACE, "HorizScaling: %04x | fbwidth %d | %u | %u", m_HorizontalScaling.Hex,
m_FBWidth.Hex, GetTicksPerEvenField(), GetTicksPerOddField());
}
static void BeginField(FieldType field, u64 ticks)
{
// Could we fit a second line of data in the stride?
bool potentially_interlaced_xfb =
((m_PictureConfiguration.STD / m_PictureConfiguration.WPL) == 2);
// Are there an odd number of half-lines per field (definition of interlaced video)
bool interlaced_video_mode = (GetHalfLinesPerEvenField() & 1) == 1;
u32 fbStride = m_PictureConfiguration.STD * 16;
u32 fbWidth = m_PictureConfiguration.WPL * 16;
u32 fbHeight = m_VerticalTimingRegister.ACV;
u32 xfbAddr;
if (field == FieldType::Even)
{
xfbAddr = GetXFBAddressBottom();
}
else
{
xfbAddr = GetXFBAddressTop();
}
if (potentially_interlaced_xfb && interlaced_video_mode && g_ActiveConfig.bForceProgressive)
{
// Strictly speaking, in interlaced mode, we're only supposed to read
// half of the lines of the XFB, and use that to display a field; the
// other lines are unspecified junk. However, in practice, we can
// almost always double the vertical resolution of the output by
// forcing progressive output: there's usually useful data in the
// other field. One notable exception: the title screen teaser
// videos in Metroid Prime don't render correctly using this hack.
fbStride /= 2;
fbHeight *= 2;
// PRB for the different fields should only ever differ by 1 in
// interlaced mode, and which is less determines which field
// has the first line. For the field with the second line, we
// offset the xfb by (-stride_of_one_line) to get the start
// address of the full xfb.
if (field == FieldType::Odd && m_VBlankTimingOdd.PRB == m_VBlankTimingEven.PRB + 1 && xfbAddr)
xfbAddr -= fbStride * 2;
if (field == FieldType::Even && m_VBlankTimingOdd.PRB == m_VBlankTimingEven.PRB - 1 && xfbAddr)
xfbAddr -= fbStride * 2;
}
LogField(field, xfbAddr);
// This assumes the game isn't going to change the VI registers while a
// frame is scanning out.
// To correctly handle that case we would need to collate all changes
// to VI during scanout and delay outputting the frame till then.
if (xfbAddr)
g_video_backend->Video_BeginField(xfbAddr, fbWidth, fbStride, fbHeight, ticks);
}
static void EndField()
{
Core::VideoThrottle();
}
// Purpose: Send VI interrupt when triggered
// Run when: When a frame is scanned (progressive/interlace)
void Update(u64 ticks)
{
if (s_half_line_of_next_si_poll == s_half_line_count)
{
SerialInterface::UpdateDevices();
s_half_line_of_next_si_poll += SerialInterface::GetPollXLines();
}
if (s_half_line_count == s_even_field_first_hl)
{
BeginField(FieldType::Even, ticks);
}
else if (s_half_line_count == s_odd_field_first_hl)
{
BeginField(FieldType::Odd, ticks);
}
else if (s_half_line_count == s_even_field_last_hl)
{
EndField();
}
else if (s_half_line_count == s_odd_field_last_hl)
{
EndField();
}
for (UVIInterruptRegister& reg : m_InterruptRegister)
{
if (s_half_line_count + 1 == 2u * reg.VCT)
{
reg.IR_INT = 1;
}
}
s_half_line_count++;
if (s_half_line_count > GetHalfLinesPerEvenField() + GetHalfLinesPerOddField())
{
s_half_line_count = 1;
s_half_line_of_next_si_poll = num_half_lines_for_si_poll; // first results start at vsync
}
if (s_half_line_count == GetHalfLinesPerEvenField())
{
s_half_line_of_next_si_poll = GetHalfLinesPerEvenField() + num_half_lines_for_si_poll;
}
if (s_half_line_count & 1)
{
s_ticks_last_line_start = CoreTiming::GetTicks();
}
UpdateInterrupts();
}
} // namespace
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