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GPU: Refactor command execution/VRAM->CPU transfers

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Simpler, and handles odd sizes correctly.
pull/22/head
Connor McLaughlin 5 years ago
parent bc9ed3572b
commit 49569d29aa
4 changed files with 166 additions and 134 deletions
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154
src/core/gpu.cpp
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@ -34,6 +34,7 @@ void GPU::UpdateSettings() {}
void GPU::Reset()
{
SoftReset();
m_GPUREAD_latch = 0;
}
void GPU::SoftReset()
@ -47,8 +48,10 @@ void GPU::SoftReset()
m_crtc_state.regs.display_address_start = 0;
m_crtc_state.regs.horizontal_display_range = 0xC60260;
m_crtc_state.regs.vertical_display_range = 0x3FC10;
m_state = State::Idle;
m_command_total_words = 0;
m_vram_transfer = {};
m_GP0_buffer.clear();
m_GPUREAD_buffer.clear();
m_render_state = {};
m_render_state.texture_page_changed = true;
UpdateGPUSTAT();
@ -108,11 +111,16 @@ bool GPU::DoState(StateWrapper& sw)
sw.Do(&m_crtc_state.in_hblank);
sw.Do(&m_crtc_state.in_vblank);
if (sw.IsReading())
UpdateSliceTicks();
sw.Do(&m_GPUREAD_latch);
sw.Do(&m_vram_transfer.x);
sw.Do(&m_vram_transfer.y);
sw.Do(&m_vram_transfer.width);
sw.Do(&m_vram_transfer.height);
sw.Do(&m_vram_transfer.col);
sw.Do(&m_vram_transfer.row);
sw.Do(&m_GP0_buffer);
sw.Do(&m_GPUREAD_buffer);
if (sw.IsReading())
{
@ -133,6 +141,7 @@ bool GPU::DoState(StateWrapper& sw)
sw.DoBytes(temp.data(), VRAM_WIDTH * VRAM_HEIGHT * sizeof(u16));
UpdateVRAM(0, 0, VRAM_WIDTH, VRAM_HEIGHT, temp.data());
UpdateDisplay();
UpdateSliceTicks();
}
else
{
@ -149,9 +158,10 @@ void GPU::RestoreGraphicsAPIState() {}
void GPU::UpdateGPUSTAT()
{
m_GPUSTAT.ready_to_send_vram = !m_GPUREAD_buffer.empty();
m_GPUSTAT.ready_to_recieve_cmd = m_GPUREAD_buffer.empty();
m_GPUSTAT.ready_to_recieve_dma = m_GPUREAD_buffer.empty();
m_GPUSTAT.ready_to_send_vram = (m_state == State::ReadingVRAM);
m_GPUSTAT.ready_to_recieve_cmd = (m_state == State::Idle);
m_GPUSTAT.ready_to_recieve_dma =
(m_state == State::Idle || (m_state != State::ReadingVRAM && m_command_total_words > 0));
bool dma_request;
switch (m_GPUSTAT.dma_direction)
@ -228,22 +238,8 @@ void GPU::DMARead(u32* words, u32 word_count)
return;
}
const u32 words_to_copy = std::min(word_count, static_cast<u32>(m_GPUREAD_buffer.size()));
if (!m_GPUREAD_buffer.empty())
{
auto it = m_GPUREAD_buffer.begin();
for (u32 i = 0; i < word_count; i++)
words[i] = *(it++);
m_GPUREAD_buffer.erase(m_GPUREAD_buffer.begin(), it);
}
if (words_to_copy < word_count)
{
Log_WarningPrintf("Partially-empty GPUREAD buffer on GPU DMA read");
std::fill_n(words + words_to_copy, word_count - words_to_copy, u32(0));
}
UpdateGPUSTAT();
for (u32 i = 0; i < word_count; i++)
words[i] = ReadGPUREAD();
}
void GPU::DMAWrite(const u32* words, u32 word_count)
@ -252,53 +248,8 @@ void GPU::DMAWrite(const u32* words, u32 word_count)
{
case DMADirection::CPUtoGP0:
{
#if 0
// partial command buffered? have to go through the slow path
if (!m_GP0_buffer.empty())
{
std::copy(words, words + word_count, std::back_inserter(m_GP0_buffer));
const u32* command_ptr = m_GP0_buffer.data();
u32 command_size = static_cast<u32>(m_GP0_buffer.size());
do
{
const u32* prev_command_ptr = command_ptr;
const bool result = HandleGP0Command(command_ptr, command_size);
command_size -= command_ptr - prev_command_ptr;
if (!result)
break;
} while (command_size > 0);
if (command_size > 0 && command_size < m_GP0_buffer.size())
m_GP0_buffer.erase(m_GP0_buffer.begin(), m_GP0_buffer.begin() + (m_GP0_buffer.size() - command_size));
else if (command_size == 0)
m_GP0_buffer.clear();
}
else
{
// fast path - read directly from DMA buffer
const u32* command_ptr = words;
u32 command_size = word_count;
do
{
const u32* prev_command_ptr = command_ptr;
const bool result = HandleGP0Command(command_ptr, command_size);
command_size -= command_ptr - prev_command_ptr;
if (!result)
break;
} while (command_size > 0);
if (command_size > 0)
{
// partial command left over
std::copy(command_ptr, command_ptr + command_size, std::back_inserter(m_GP0_buffer));
}
}
UpdateGPUSTAT();
#else
for (u32 i = 0; i < word_count; i++)
WriteGP0(words[i]);
#endif
std::copy(words, words + word_count, std::back_inserter(m_GP0_buffer));
ExecuteCommands();
}
break;
@ -491,32 +442,44 @@ void GPU::Execute(TickCount ticks)
u32 GPU::ReadGPUREAD()
{
if (m_GPUREAD_buffer.empty())
if (m_state != State::ReadingVRAM)
return m_GPUREAD_latch;
// Read two pixels out of VRAM and combine them. Zero fill odd pixel counts.
u32 value = 0;
for (u32 i = 0; i < 2; i++)
{
Log_DevPrintf("GPUREAD read while buffer is empty");
return UINT32_C(0xFFFFFFFF);
// Read with correct wrap-around behavior.
const u16 read_x = (m_vram_transfer.x + m_vram_transfer.col) % VRAM_WIDTH;
const u16 read_y = (m_vram_transfer.y + m_vram_transfer.row) % VRAM_HEIGHT;
value = (value << 16) | ZeroExtend32(m_vram_ptr[read_y * VRAM_WIDTH + read_x]);
if (++m_vram_transfer.col == m_vram_transfer.width)
{
m_vram_transfer.col = 0;
if (++m_vram_transfer.row == m_vram_transfer.height)
{
Log_DebugPrintf("End of VRAM->CPU transfer");
m_vram_transfer = {};
m_state = State::Idle;
UpdateGPUSTAT();
// end of transfer, catch up on any commands which were written (unlikely)
ExecuteCommands();
break;
}
}
}
const u32 value = m_GPUREAD_buffer.front();
m_GPUREAD_buffer.pop_front();
UpdateGPUSTAT();
m_GPUREAD_latch = value;
return value;
}
void GPU::WriteGP0(u32 value)
{
m_GP0_buffer.push_back(value);
Assert(m_GP0_buffer.size() <= 1048576);
const u32* command_ptr = m_GP0_buffer.data();
const u32 command = m_GP0_buffer[0] >> 24;
if ((this->*s_GP0_command_handler_table[command])(command_ptr, static_cast<u32>(m_GP0_buffer.size())))
{
DebugAssert(static_cast<size_t>(command_ptr - m_GP0_buffer.data()) == m_GP0_buffer.size());
m_GP0_buffer.clear();
}
UpdateGPUSTAT();
ExecuteCommands();
}
void GPU::WriteGP1(u32 value)
@ -535,6 +498,9 @@ void GPU::WriteGP1(u32 value)
case 0x01: // Clear FIFO
{
Log_DebugPrintf("GP1 clear FIFO");
m_state = State::Idle;
m_command_total_words = 0;
m_vram_transfer = {};
m_GP0_buffer.clear();
UpdateGPUSTAT();
}
@ -658,31 +624,31 @@ void GPU::HandleGetGPUInfoCommand(u32 value)
case 0x02: // Get Texture Window
{
Log_DebugPrintf("Get texture window");
m_GPUREAD_buffer.push_back(m_render_state.texture_window_value);
m_GPUREAD_latch = m_render_state.texture_window_value;
}
break;
case 0x03: // Get Draw Area Top Left
{
Log_DebugPrintf("Get drawing area top left");
m_GPUREAD_buffer.push_back((m_drawing_area.left & UINT32_C(0b1111111111)) |
((m_drawing_area.top & UINT32_C(0b1111111111)) << 10));
m_GPUREAD_latch =
((m_drawing_area.left & UINT32_C(0b1111111111)) | ((m_drawing_area.top & UINT32_C(0b1111111111)) << 10));
}
break;
case 0x04: // Get Draw Area Bottom Right
{
Log_DebugPrintf("Get drawing area bottom right");
m_GPUREAD_buffer.push_back((m_drawing_area.right & UINT32_C(0b1111111111)) |
((m_drawing_area.bottom & UINT32_C(0b1111111111)) << 10));
m_GPUREAD_latch =
((m_drawing_area.right & UINT32_C(0b1111111111)) | ((m_drawing_area.bottom & UINT32_C(0b1111111111)) << 10));
}
break;
case 0x05: // Get Drawing Offset
{
Log_DebugPrintf("Get drawing offset");
m_GPUREAD_buffer.push_back((m_drawing_offset.x & INT32_C(0b11111111111)) |
((m_drawing_offset.y & INT32_C(0b11111111111)) << 11));
m_GPUREAD_latch =
((m_drawing_offset.x & INT32_C(0b11111111111)) | ((m_drawing_offset.y & INT32_C(0b11111111111)) << 11));
}
break;

27
src/core/gpu.h
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@ -72,6 +72,15 @@ public:
Disabled = 4 // Not a register value
};
enum class State : u8
{
Idle,
WaitingForParameters,
ExecutingCommand,
ReadingVRAM,
WritingVRAM
};
enum : u32
{
VRAM_WIDTH = 1024,
@ -285,6 +294,8 @@ protected:
u32 ReadGPUREAD();
void WriteGP0(u32 value);
void WriteGP1(u32 value);
void ExecuteCommands();
void EndCommand();
void HandleGetGPUInfoCommand(u32 value);
// Rendering in the backend
@ -467,8 +478,22 @@ protected:
bool in_vblank;
} m_crtc_state = {};
State m_state = State::Idle;
u32 m_command_total_words = 0;
struct VRAMTransfer
{
u16 x;
u16 y;
u16 width;
u16 height;
u16 col;
u16 row;
} m_vram_transfer = {};
/// GPUREAD value for non-VRAM-reads.
u32 m_GPUREAD_latch = 0;
std::vector<u32> m_GP0_buffer;
std::deque<u32> m_GPUREAD_buffer;
struct Stats
{

117
src/core/gpu_commands.cpp
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@ -5,6 +5,14 @@
#include "system.h"
Log_SetChannel(GPU);
#define CHECK_COMMAND_SIZE(num_words) \
if (command_size < num_words) \
{ \
m_command_total_words = num_words; \
m_state = State::WaitingForParameters; \
return false; \
}
static u32 s_cpu_to_vram_dump_id = 1;
static u32 s_vram_to_cpu_dump_id = 1;
@ -13,6 +21,38 @@ static constexpr u32 ReplaceZero(u32 value, u32 value_for_zero)
return value == 0 ? value_for_zero : value;
}
void GPU::ExecuteCommands()
{
Assert(m_GP0_buffer.size() < 1048576);
const u32* command_ptr = m_GP0_buffer.data();
u32 command_size = static_cast<u32>(m_GP0_buffer.size());
while (m_state != State::ReadingVRAM && command_size > 0 && command_size >= m_command_total_words)
{
const u32 command = command_ptr[0] >> 24;
const u32* old_command_ptr = command_ptr;
if (!(this->*s_GP0_command_handler_table[command])(command_ptr, command_size))
break;
const u32 words_used = static_cast<u32>(command_ptr - old_command_ptr);
DebugAssert(words_used <= command_size);
command_size -= words_used;
}
if (command_size == 0)
m_GP0_buffer.clear();
else if (command_ptr > m_GP0_buffer.data())
m_GP0_buffer.erase(m_GP0_buffer.begin(), m_GP0_buffer.begin() + (command_ptr - m_GP0_buffer.data()));
UpdateGPUSTAT();
}
void GPU::EndCommand()
{
m_state = State::Idle;
m_command_total_words = 0;
}
GPU::GP0CommandHandlerTable GPU::GenerateGP0CommandHandlerTable()
{
GP0CommandHandlerTable table = {};
@ -50,12 +90,14 @@ bool GPU::HandleUnknownGP0Command(const u32*& command_ptr, u32 command_size)
{
const u32 command = *(command_ptr++) >> 24;
Log_ErrorPrintf("Unimplemented GP0 command 0x%02X", command);
EndCommand();
return true;
}
bool GPU::HandleNOPCommand(const u32*& command_ptr, u32 command_size)
{
command_ptr++;
EndCommand();
return true;
}
@ -63,6 +105,7 @@ bool GPU::HandleClearCacheCommand(const u32*& command_ptr, u32 command_size)
{
Log_DebugPrintf("GP0 clear cache");
command_ptr++;
EndCommand();
return true;
}
@ -75,6 +118,7 @@ bool GPU::HandleInterruptRequestCommand(const u32*& command_ptr, u32 command_siz
m_interrupt_controller->InterruptRequest(InterruptController::IRQ::GPU);
}
EndCommand();
return true;
}
@ -89,6 +133,8 @@ bool GPU::HandleSetDrawModeCommand(const u32*& command_ptr, u32 command_size)
m_render_state.texture_x_flip = (param & (1 << 12)) != 0;
m_render_state.texture_y_flip = (param & (1 << 13)) != 0;
Log_DebugPrintf("Set draw mode %08X", param);
EndCommand();
return true;
}
@ -99,6 +145,8 @@ bool GPU::HandleSetTextureWindowCommand(const u32*& command_ptr, u32 command_siz
Log_DebugPrintf("Set texture window %02X %02X %02X %02X", m_render_state.texture_window_mask_x,
m_render_state.texture_window_mask_y, m_render_state.texture_window_offset_x,
m_render_state.texture_window_offset_y);
EndCommand();
return true;
}
@ -117,6 +165,7 @@ bool GPU::HandleSetDrawingAreaTopLeftCommand(const u32*& command_ptr, u32 comman
m_drawing_area_changed = true;
}
EndCommand();
return true;
}
@ -136,6 +185,7 @@ bool GPU::HandleSetDrawingAreaBottomRightCommand(const u32*& command_ptr, u32 co
m_drawing_area_changed = true;
}
EndCommand();
return true;
}
@ -153,6 +203,8 @@ bool GPU::HandleSetDrawingOffsetCommand(const u32*& command_ptr, u32 command_siz
m_drawing_offset.y = y;
m_drawing_offset_changed = true;
}
EndCommand();
return true;
}
@ -164,6 +216,8 @@ bool GPU::HandleSetMaskBitCommand(const u32*& command_ptr, u32 command_size)
m_GPUSTAT.draw_to_masked_pixels = (param & 0x01) != 0;
Log_DebugPrintf("Set mask bit %u %u", BoolToUInt32(m_GPUSTAT.draw_set_mask_bit),
BoolToUInt32(m_GPUSTAT.draw_to_masked_pixels));
EndCommand();
return true;
}
@ -229,8 +283,7 @@ bool GPU::HandleRenderCommand(const u32*& command_ptr, u32 command_size)
return true;
}
if (command_size < total_words)
return false;
CHECK_COMMAND_SIZE(total_words);
static constexpr std::array<const char*, 4> primitive_names = {{"", "polygon", "line", "rectangle"}};
@ -244,13 +297,13 @@ bool GPU::HandleRenderCommand(const u32*& command_ptr, u32 command_size)
command_ptr += total_words;
m_stats.num_vertices += num_vertices;
m_stats.num_polygons++;
EndCommand();
return true;
}
bool GPU::HandleFillRectangleCommand(const u32*& command_ptr, u32 command_size)
{
if (command_size < 3)
return false;
CHECK_COMMAND_SIZE(3);
FlushRender();
@ -265,20 +318,24 @@ bool GPU::HandleFillRectangleCommand(const u32*& command_ptr, u32 command_size)
FillVRAM(dst_x, dst_y, width, height, color);
m_stats.num_vram_fills++;
EndCommand();
return true;
}
bool GPU::HandleCopyRectangleCPUToVRAMCommand(const u32*& command_ptr, u32 command_size)
{
if (command_size < 3)
return false;
CHECK_COMMAND_SIZE(3);
const u32 copy_width = ReplaceZero(command_ptr[2] & 0x3FF, 0x400);
const u32 copy_height = ReplaceZero((command_ptr[2] >> 16) & 0x1FF, 0x200);
const u32 num_pixels = copy_width * copy_height;
const u32 num_words = 3 + ((num_pixels + 1) / 2);
if (command_size < num_words)
{
m_command_total_words = num_words;
m_state = State::WritingVRAM;
return false;
}
const u32 dst_x = command_ptr[1] & 0x3FF;
const u32 dst_y = (command_ptr[1] >> 16) & 0x3FF;
@ -296,57 +353,40 @@ bool GPU::HandleCopyRectangleCPUToVRAMCommand(const u32*& command_ptr, u32 comma
UpdateVRAM(dst_x, dst_y, copy_width, copy_height, &command_ptr[3]);
command_ptr += num_words;
m_stats.num_vram_writes++;
EndCommand();
return true;
}
bool GPU::HandleCopyRectangleVRAMToCPUCommand(const u32*& command_ptr, u32 command_size)
{
if (command_size < 3)
return false;
CHECK_COMMAND_SIZE(3);
const u32 width = ReplaceZero(command_ptr[2] & 0x3FF, 0x400);
const u32 height = ReplaceZero((command_ptr[2] >> 16) & 0x1FF, 0x200);
const u32 num_pixels = width * height;
const u32 num_words = ((num_pixels + 1) / 2);
const u32 src_x = command_ptr[1] & 0x3FF;
const u32 src_y = (command_ptr[1] >> 16) & 0x3FF;
m_vram_transfer.width = ((Truncate16(command_ptr[2]) - 1) & 0x3FF) + 1;
m_vram_transfer.height = ((Truncate16(command_ptr[2] >> 16) - 1) & 0x1FF) + 1;
m_vram_transfer.x = Truncate16(command_ptr[1] & 0x3FF);
m_vram_transfer.y = Truncate16((command_ptr[1] >> 16) & 0x3FF);
command_ptr += 3;
Log_DebugPrintf("Copy rectangle from VRAM to CPU offset=(%u,%u), size=(%u,%u)", src_x, src_y, width, height);
Log_DebugPrintf("Copy rectangle from VRAM to CPU offset=(%u,%u), size=(%u,%u)", m_vram_transfer.x, m_vram_transfer.y,
m_vram_transfer.width, m_vram_transfer.height);
DebugAssert(m_vram_transfer.col == 0 && m_vram_transfer.row == 0);
// all rendering should be done first...
FlushRender();
// TODO: A better way of doing this.. get rid of the m_GPUREAD_buffer.
ReadVRAM(src_x, src_y, width, height);
for (u32 row = 0; row < height;)
{
const u32 row_offset = ((src_y + row++) % VRAM_HEIGHT) * VRAM_WIDTH;
for (u32 col = 0; col < width;)
{
// TODO: Handle unaligned reads...
const u32 col_offset1 = row_offset + ((src_x + col++) % VRAM_WIDTH);
const u32 col_offset2 = row_offset + ((src_x + col++) % VRAM_WIDTH);
m_GPUREAD_buffer.push_back(ZeroExtend32(m_vram_ptr[col_offset1]) | (ZeroExtend32(m_vram_ptr[col_offset2]) << 16));
}
}
if (m_system->GetSettings().debugging.dump_vram_to_cpu_copies)
{
std::vector<u32> temp;
std::copy(m_GPUREAD_buffer.begin(), m_GPUREAD_buffer.end(), std::back_inserter(temp));
DumpVRAMToFile(SmallString::FromFormat("vram_to_cpu_copy_%u.png", s_vram_to_cpu_dump_id++), width, height,
sizeof(u16) * width, temp.data(), true);
}
// ensure VRAM shadow is up to date
ReadVRAM(m_vram_transfer.x, m_vram_transfer.y, m_vram_transfer.width, m_vram_transfer.height);
// switch to pixel-by-pixel read state
m_stats.num_vram_reads++;
m_state = State::ReadingVRAM;
m_command_total_words = 0;
return true;
}
bool GPU::HandleCopyRectangleVRAMToVRAMCommand(const u32*& command_ptr, u32 command_size)
{
if (command_size < 4)
return false;
CHECK_COMMAND_SIZE(4);
const u32 src_x = command_ptr[1] & 0x3FF;
const u32 src_y = (command_ptr[1] >> 16) & 0x3FF;
@ -369,5 +409,6 @@ bool GPU::HandleCopyRectangleVRAMToVRAMCommand(const u32*& command_ptr, u32 comm
FlushRender();
CopyVRAM(src_x, src_y, dst_x, dst_y, width, height);
m_stats.num_vram_copies++;
EndCommand();
return true;
}

2
src/duckstation/main.cpp
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@ -83,7 +83,7 @@ int main(int argc, char* argv[])
#else
g_pLog->SetConsoleOutputParams(true, nullptr, LOGLEVEL_DEBUG);
// g_pLog->SetConsoleOutputParams(true, "GPU GPU_HW_OpenGL SPU Pad DigitalController", LOGLEVEL_DEBUG);
g_pLog->SetConsoleOutputParams(true, "GPU GPU_HW_OpenGL Pad DigitalController MemoryCard InterruptController SPU MDEC", LOGLEVEL_DEBUG);
// g_pLog->SetConsoleOutputParams(true, "GPU GPU_HW_OpenGL Pad DigitalController MemoryCard InterruptController SPU MDEC", LOGLEVEL_DEBUG);
// g_pLog->SetFilterLevel(LOGLEVEL_TRACE);
g_pLog->SetFilterLevel(LOGLEVEL_DEBUG);
// g_pLog->SetFilterLevel(LOGLEVEL_DEV);

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