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GPU: Copy-less processing from DMA

Browse Source
pull/22/head
Connor McLaughlin 5 years ago
parent ec8c5d4bb6
commit 7448cbaf9d
4 changed files with 143 additions and 112 deletions
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205
src/core/gpu.cpp
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@ -39,7 +39,7 @@ 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_GP0_command.clear();
m_GP0_buffer.clear();
m_GPUREAD_buffer.clear();
m_render_state = {};
m_render_state.texture_page_changed = true;
@ -107,7 +107,7 @@ bool GPU::DoState(StateWrapper& sw)
if (sw.IsReading())
UpdateSliceTicks();
sw.Do(&m_GP0_command);
sw.Do(&m_GP0_buffer);
sw.Do(&m_GPUREAD_buffer);
if (sw.IsReading())
@ -250,11 +250,45 @@ void GPU::DMAWrite(const u32* words, u32 word_count)
{
case DMADirection::CPUtoGP0:
{
m_GP0_command.reserve(m_GP0_command.size() + word_count);
for (u32 i = 0; i < word_count; i++)
// partial command buffered? have to go through the slow path
if (!m_GP0_buffer.empty())
{
m_GP0_command.push_back(*(words++));
HandleGP0Command();
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();
@ -394,60 +428,50 @@ u32 GPU::ReadGPUREAD()
void GPU::WriteGP0(u32 value)
{
m_GP0_command.push_back(value);
Assert(m_GP0_command.size() <= 1048576);
HandleGP0Command();
m_GP0_buffer.push_back(value);
Assert(m_GP0_buffer.size() <= 1048576);
const u32* command_ptr = m_GP0_buffer.data();
if (HandleGP0Command(command_ptr, static_cast<u32>(m_GP0_buffer.size())))
{
DebugAssert((command_ptr - m_GP0_buffer.data()) == m_GP0_buffer.size());
m_GP0_buffer.clear();
}
UpdateGPUSTAT();
}
void GPU::HandleGP0Command()
bool GPU::HandleGP0Command(const u32*& command_ptr, u32 command_size)
{
const u8 command = Truncate8(m_GP0_command[0] >> 24);
const u32 param = m_GP0_command[0] & UINT32_C(0x00FFFFFF);
const u8 command = Truncate8(command_ptr[0] >> 24);
if (command >= 0x20 && command <= 0x7F)
{
// Draw polygon
if (!HandleRenderCommand())
return;
return HandleRenderCommand(command_ptr, command_size);
}
else
{
const u32 param = command_ptr[0] & UINT32_C(0x00FFFFFF);
switch (command)
{
case 0x00: // NOP
break;
case 0x01: // Clear cache
break;
command_ptr++;
return true;
case 0x02: // Fill Rectangle
{
if (!HandleFillRectangleCommand())
return;
}
break;
return HandleFillRectangleCommand(command_ptr, command_size);
case 0xA0: // Copy Rectangle CPU->VRAM
{
if (!HandleCopyRectangleCPUToVRAMCommand())
return;
}
break;
return HandleCopyRectangleCPUToVRAMCommand(command_ptr, command_size);
case 0xC0: // Copy Rectangle VRAM->CPU
{
if (!HandleCopyRectangleVRAMToCPUCommand())
return;
}
break;
return HandleCopyRectangleVRAMToCPUCommand(command_ptr, command_size);
case 0x80: // Copy Rectangle VRAM->VRAM
{
if (!HandleCopyRectangleVRAMToVRAMCommand())
return;
}
break;
return HandleCopyRectangleVRAMToVRAMCommand(command_ptr, command_size);
case 0xE1: // Set draw mode
{
@ -458,8 +482,9 @@ void GPU::HandleGP0Command()
m_render_state.texture_x_flip = (param & (UINT32_C(1) << 12)) != 0;
m_render_state.texture_y_flip = (param & (UINT32_C(1) << 13)) != 0;
Log_DebugPrintf("Set draw mode %08X", param);
command_ptr++;
return true;
}
break;
case 0xE2: // set texture window
{
@ -467,8 +492,9 @@ void GPU::HandleGP0Command()
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);
command_ptr++;
return true;
}
break;
case 0xE3: // Set drawing area top left
{
@ -483,8 +509,9 @@ void GPU::HandleGP0Command()
m_drawing_area.top = top;
UpdateDrawingArea();
}
command_ptr++;
return true;
}
break;
case 0xE4: // Set drawing area bottom right
{
@ -499,8 +526,9 @@ void GPU::HandleGP0Command()
m_drawing_area.bottom = bottom;
UpdateDrawingArea();
}
command_ptr++;
return true;
}
break;
case 0xE5: // Set drawing offset
{
@ -514,8 +542,9 @@ void GPU::HandleGP0Command()
m_drawing_offset.x = x;
m_drawing_offset.y = y;
}
command_ptr++;
return true;
}
break;
case 0xE6: // Mask bit setting
{
@ -523,18 +552,18 @@ void GPU::HandleGP0Command()
m_GPUSTAT.draw_to_masked_pixels = (param & UINT32_C(0x01)) != 0;
Log_DebugPrintf("Set mask bit %u %u", BoolToUInt32(m_GPUSTAT.draw_set_mask_bit),
BoolToUInt32(m_GPUSTAT.draw_to_masked_pixels));
command_ptr++;
return true;
}
break;
default:
{
Log_ErrorPrintf("Unimplemented GP0 command 0x%02X", command);
command_ptr++;
return true;
}
break;
}
}
m_GP0_command.clear();
}
void GPU::WriteGP1(u32 value)
@ -545,7 +574,7 @@ void GPU::WriteGP1(u32 value)
{
case 0x01: // Clear FIFO
{
m_GP0_command.clear();
m_GP0_buffer.clear();
Log_DebugPrintf("GP1 clear FIFO");
UpdateGPUSTAT();
}
@ -695,11 +724,9 @@ void GPU::HandleGetGPUInfoCommand(u32 value)
}
}
bool GPU::HandleRenderCommand()
bool GPU::HandleRenderCommand(const u32*& command_ptr, u32 command_size)
{
const u8 command = Truncate8(m_GP0_command[0] >> 24);
const RenderCommand rc{m_GP0_command[0]};
const RenderCommand rc{command_ptr[0]};
u8 words_per_vertex;
u32 num_vertices;
u32 total_words;
@ -722,10 +749,9 @@ bool GPU::HandleRenderCommand()
// polyline goes until we hit the termination code
num_vertices = 0;
bool found_terminator = false;
for (u32 pos = BoolToUInt32(!rc.shading_enable); pos < static_cast<u32>(m_GP0_command.size());
pos += words_per_vertex)
for (u32 pos = 1 + BoolToUInt32(!rc.shading_enable); pos < command_size; pos += words_per_vertex)
{
if (m_GP0_command[pos] == 0x55555555)
if (command_ptr[pos] == 0x55555555)
{
found_terminator = true;
break;
@ -759,7 +785,7 @@ bool GPU::HandleRenderCommand()
return true;
}
if (m_GP0_command.size() < total_words)
if (command_size < total_words)
return false;
static constexpr std::array<const char*, 4> primitive_names = {{"", "polygon", "line", "rectangle"}};
@ -770,22 +796,24 @@ bool GPU::HandleRenderCommand()
primitive_names[static_cast<u8>(rc.primitive.GetValue())], ZeroExtend32(num_vertices),
ZeroExtend32(words_per_vertex));
DispatchRenderCommand(rc, num_vertices);
DispatchRenderCommand(rc, num_vertices, command_ptr);
command_ptr += total_words;
return true;
}
bool GPU::HandleFillRectangleCommand()
bool GPU::HandleFillRectangleCommand(const u32*& command_ptr, u32 command_size)
{
if (m_GP0_command.size() < 3)
if (command_size < 3)
return false;
FlushRender();
const u32 color = m_GP0_command[0] & UINT32_C(0x00FFFFFF);
const u32 dst_x = m_GP0_command[1] & UINT32_C(0xFFFF);
const u32 dst_y = m_GP0_command[1] >> 16;
const u32 width = m_GP0_command[2] & UINT32_C(0xFFFF);
const u32 height = m_GP0_command[2] >> 16;
const u32 color = command_ptr[0] & UINT32_C(0x00FFFFFF);
const u32 dst_x = command_ptr[1] & UINT32_C(0xFFFF);
const u32 dst_y = command_ptr[1] >> 16;
const u32 width = command_ptr[2] & UINT32_C(0xFFFF);
const u32 height = command_ptr[2] >> 16;
command_ptr += 3;
Log_DebugPrintf("Fill VRAM rectangle offset=(%u,%u), size=(%u,%u)", dst_x, dst_y, width, height);
@ -797,20 +825,20 @@ bool GPU::HandleFillRectangleCommand()
return true;
}
bool GPU::HandleCopyRectangleCPUToVRAMCommand()
bool GPU::HandleCopyRectangleCPUToVRAMCommand(const u32*& command_ptr, u32 command_size)
{
if (m_GP0_command.size() < 3)
if (command_size < 3)
return false;
const u32 copy_width = m_GP0_command[2] & UINT32_C(0xFFFF);
const u32 copy_height = m_GP0_command[2] >> 16;
const u32 copy_width = command_ptr[2] & UINT32_C(0xFFFF);
const u32 copy_height = command_ptr[2] >> 16;
const u32 num_pixels = copy_width * copy_height;
const u32 num_words = 3 + ((num_pixels + 1) / 2);
if (m_GP0_command.size() < num_words)
if (command_size < num_words)
return false;
const u32 dst_x = m_GP0_command[1] & UINT32_C(0xFFFF);
const u32 dst_y = m_GP0_command[1] >> 16;
const u32 dst_x = command_ptr[1] & UINT32_C(0xFFFF);
const u32 dst_y = command_ptr[1] >> 16;
Log_DebugPrintf("Copy rectangle from CPU to VRAM offset=(%u,%u), size=(%u,%u)", dst_x, dst_y, copy_width,
copy_height);
@ -824,25 +852,27 @@ bool GPU::HandleCopyRectangleCPUToVRAMCommand()
if (m_debug_options.dump_cpu_to_vram_copies)
{
DumpVRAMToFile(SmallString::FromFormat("cpu_to_vram_copy_%u.png", s_cpu_to_vram_dump_id++), copy_width, copy_height,
sizeof(u16) * copy_width, &m_GP0_command[3], true);
sizeof(u16) * copy_width, &command_ptr[3], true);
}
FlushRender();
UpdateVRAM(dst_x, dst_y, copy_width, copy_height, &m_GP0_command[3]);
UpdateVRAM(dst_x, dst_y, copy_width, copy_height, &command_ptr[3]);
command_ptr += num_words;
return true;
}
bool GPU::HandleCopyRectangleVRAMToCPUCommand()
bool GPU::HandleCopyRectangleVRAMToCPUCommand(const u32*& command_ptr, u32 command_size)
{
if (m_GP0_command.size() < 3)
if (command_size < 3)
return false;
const u32 width = m_GP0_command[2] & UINT32_C(0xFFFF);
const u32 height = m_GP0_command[2] >> 16;
const u32 width = command_ptr[2] & UINT32_C(0xFFFF);
const u32 height = command_ptr[2] >> 16;
const u32 num_pixels = width * height;
const u32 num_words = ((num_pixels + 1) / 2);
const u32 src_x = m_GP0_command[1] & UINT32_C(0xFFFF);
const u32 src_y = m_GP0_command[1] >> 16;
const u32 src_x = command_ptr[1] & UINT32_C(0xFFFF);
const u32 src_y = command_ptr[1] >> 16;
command_ptr += 3;
Log_DebugPrintf("Copy rectangle from VRAM to CPU offset=(%u,%u), size=(%u,%u)", src_x, src_y, width, height);
@ -871,17 +901,18 @@ bool GPU::HandleCopyRectangleVRAMToCPUCommand()
return true;
}
bool GPU::HandleCopyRectangleVRAMToVRAMCommand()
bool GPU::HandleCopyRectangleVRAMToVRAMCommand(const u32*& command_ptr, u32 command_size)
{
if (m_GP0_command.size() < 4)
if (command_size < 4)
return false;
const u32 src_x = m_GP0_command[1] & UINT32_C(0xFFFF);
const u32 src_y = m_GP0_command[1] >> 16;
const u32 dst_x = m_GP0_command[2] & UINT32_C(0xFFFF);
const u32 dst_y = m_GP0_command[2] >> 16;
const u32 width = m_GP0_command[3] & UINT32_C(0xFFFF);
const u32 height = m_GP0_command[3] >> 16;
const u32 src_x = command_ptr[1] & UINT32_C(0xFFFF);
const u32 src_y = command_ptr[1] >> 16;
const u32 dst_x = command_ptr[2] & UINT32_C(0xFFFF);
const u32 dst_y = command_ptr[2] >> 16;
const u32 width = command_ptr[3] & UINT32_C(0xFFFF);
const u32 height = command_ptr[3] >> 16;
command_ptr += 4;
Log_DebugPrintf("Copy rectangle from VRAM to VRAM src=(%u,%u), dst=(%u,%u), size=(%u,%u)", src_x, src_y, dst_x, dst_y,
width, height);
@ -910,7 +941,7 @@ void GPU::UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void* data) {}
void GPU::CopyVRAM(u32 src_x, u32 src_y, u32 dst_x, u32 dst_y, u32 width, u32 height) {}
void GPU::DispatchRenderCommand(RenderCommand rc, u32 num_vertices) {}
void GPU::DispatchRenderCommand(RenderCommand rc, u32 num_vertices, const u32* command_ptr) {}
void GPU::FlushRender() {}

16
src/core/gpu.h
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@ -185,12 +185,12 @@ protected:
void HandleGetGPUInfoCommand(u32 value);
// Rendering commands, returns false if not enough data is provided
void HandleGP0Command();
bool HandleRenderCommand();
bool HandleFillRectangleCommand();
bool HandleCopyRectangleCPUToVRAMCommand();
bool HandleCopyRectangleVRAMToCPUCommand();
bool HandleCopyRectangleVRAMToVRAMCommand();
bool HandleGP0Command(const u32*& command_ptr, u32 command_size);
bool HandleRenderCommand(const u32*& command_ptr, u32 command_size);
bool HandleFillRectangleCommand(const u32*& command_ptr, u32 command_size);
bool HandleCopyRectangleCPUToVRAMCommand(const u32*& command_ptr, u32 command_size);
bool HandleCopyRectangleVRAMToCPUCommand(const u32*& command_ptr, u32 command_size);
bool HandleCopyRectangleVRAMToVRAMCommand(const u32*& command_ptr, u32 command_size);
// Rendering in the backend
virtual void UpdateDisplay();
@ -199,7 +199,7 @@ protected:
virtual void FillVRAM(u32 x, u32 y, u32 width, u32 height, u16 color);
virtual void UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void* data);
virtual void CopyVRAM(u32 src_x, u32 src_y, u32 dst_x, u32 dst_y, u32 width, u32 height);
virtual void DispatchRenderCommand(RenderCommand rc, u32 num_vertices);
virtual void DispatchRenderCommand(RenderCommand rc, u32 num_vertices, const u32* command_ptr);
virtual void FlushRender();
// Debugging
@ -353,7 +353,7 @@ protected:
bool in_vblank;
} m_crtc_state = {};
std::vector<u32> m_GP0_command;
std::vector<u32> m_GP0_buffer;
std::deque<u32> m_GPUREAD_buffer;
DebugOptions m_debug_options;

30
src/core/gpu_hw.cpp
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@ -15,7 +15,7 @@ void GPU_HW::Reset()
m_batch = {};
}
void GPU_HW::LoadVertices(RenderCommand rc, u32 num_vertices)
void GPU_HW::LoadVertices(RenderCommand rc, u32 num_vertices, const u32* command_ptr)
{
const u32 texpage =
ZeroExtend32(m_render_state.texpage_attribute) | (ZeroExtend32(m_render_state.texlut_attribute) << 16);
@ -38,16 +38,16 @@ void GPU_HW::LoadVertices(RenderCommand rc, u32 num_vertices)
for (u32 i = 0; i < num_vertices; i++)
{
HWVertex hw_vert;
hw_vert.color = (shaded && i > 0) ? (m_GP0_command[buffer_pos++] & UINT32_C(0x00FFFFFF)) : first_color;
hw_vert.color = (shaded && i > 0) ? (command_ptr[buffer_pos++] & UINT32_C(0x00FFFFFF)) : first_color;
const VertexPosition vp{m_GP0_command[buffer_pos++]};
const VertexPosition vp{command_ptr[buffer_pos++]};
hw_vert.x = vp.x;
hw_vert.y = vp.y;
hw_vert.texpage = texpage;
if (textured)
{
hw_vert.texcoord = Truncate16(m_GP0_command[buffer_pos++]);
hw_vert.texcoord = Truncate16(command_ptr[buffer_pos++]);
// auto [u, v] = HWVertex::DecodeTexcoord(hw_vert.texcoord);
// u = (u & (~(m_render_state.texture_window_mask_x * 8))) | ((m_render_state.texture_window_offset_x &
// m_render_state.texture_window_mask_x) * 8); v = (v & (~(m_render_state.texture_window_mask_y * 8))) |
@ -80,11 +80,11 @@ void GPU_HW::LoadVertices(RenderCommand rc, u32 num_vertices)
u32 buffer_pos = 1;
const bool textured = rc.texture_enable;
const u32 color = rc.color_for_first_vertex;
const VertexPosition vp{m_GP0_command[buffer_pos++]};
const VertexPosition vp{command_ptr[buffer_pos++]};
const s32 pos_left = vp.x;
const s32 pos_top = vp.y;
const auto [tex_left, tex_top] =
HWVertex::DecodeTexcoord(rc.texture_enable ? Truncate16(m_GP0_command[buffer_pos++]) : 0);
HWVertex::DecodeTexcoord(rc.texture_enable ? Truncate16(command_ptr[buffer_pos++]) : 0);
s32 rectangle_width;
s32 rectangle_height;
switch (rc.rectangle_size)
@ -102,8 +102,8 @@ void GPU_HW::LoadVertices(RenderCommand rc, u32 num_vertices)
rectangle_height = 16;
break;
default:
rectangle_width = static_cast<s32>(m_GP0_command[buffer_pos] & UINT32_C(0xFFFF));
rectangle_height = static_cast<s32>(m_GP0_command[buffer_pos] >> 16);
rectangle_width = static_cast<s32>(command_ptr[buffer_pos] & UINT32_C(0xFFFF));
rectangle_height = static_cast<s32>(command_ptr[buffer_pos] >> 16);
break;
}
@ -134,8 +134,8 @@ void GPU_HW::LoadVertices(RenderCommand rc, u32 num_vertices)
u32 buffer_pos = 1;
for (u32 i = 0; i < num_vertices; i++)
{
const u32 color = (shaded && i > 0) ? (m_GP0_command[buffer_pos++] & UINT32_C(0x00FFFFFF)) : first_color;
const VertexPosition vp{m_GP0_command[buffer_pos++]};
const u32 color = (shaded && i > 0) ? (command_ptr[buffer_pos++] & UINT32_C(0x00FFFFFF)) : first_color;
const VertexPosition vp{command_ptr[buffer_pos++]};
m_batch.vertices.push_back(HWVertex{vp.x.GetValue(), vp.y.GetValue(), color});
}
}
@ -480,7 +480,7 @@ GPU_HW::HWRenderBatch::Primitive GPU_HW::GetPrimitiveForCommand(RenderCommand rc
void GPU_HW::InvalidateVRAMReadCache() {}
void GPU_HW::DispatchRenderCommand(RenderCommand rc, u32 num_vertices)
void GPU_HW::DispatchRenderCommand(RenderCommand rc, u32 num_vertices, const u32* command_ptr)
{
if (rc.texture_enable)
{
@ -490,15 +490,15 @@ void GPU_HW::DispatchRenderCommand(RenderCommand rc, u32 num_vertices)
case Primitive::Polygon:
{
if (rc.shading_enable)
m_render_state.SetFromPolygonTexcoord(m_GP0_command[2], m_GP0_command[5]);
m_render_state.SetFromPolygonTexcoord(command_ptr[2], command_ptr[5]);
else
m_render_state.SetFromPolygonTexcoord(m_GP0_command[2], m_GP0_command[4]);
m_render_state.SetFromPolygonTexcoord(command_ptr[2], command_ptr[4]);
}
break;
case Primitive::Rectangle:
{
m_render_state.SetFromRectangleTexcoord(m_GP0_command[2]);
m_render_state.SetFromRectangleTexcoord(command_ptr[2]);
m_render_state.SetFromPageAttribute(Truncate16(m_GPUSTAT.bits));
}
break;
@ -586,5 +586,5 @@ void GPU_HW::DispatchRenderCommand(RenderCommand rc, u32 num_vertices)
m_render_state.ClearTextureWindowChangedFlag();
}
LoadVertices(rc, num_vertices);
LoadVertices(rc, num_vertices, command_ptr);
}

4
src/core/gpu_hw.h
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@ -83,7 +83,7 @@ protected:
bool IsFlushed() const { return m_batch.vertices.empty(); }
void DispatchRenderCommand(RenderCommand rc, u32 num_vertices) override;
void DispatchRenderCommand(RenderCommand rc, u32 num_vertices, const u32* command_ptr) override;
void CalcScissorRect(int* left, int* top, int* right, int* bottom);
@ -107,5 +107,5 @@ private:
void GenerateShaderHeader(std::stringstream& ss);
void LoadVertices(RenderCommand rc, u32 num_vertices);
void LoadVertices(RenderCommand rc, u32 num_vertices, const u32* command_ptr);
};

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