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GPU: Basic/hacky CPU->VRAM transfers

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This commit is contained in:
Connor McLaughlin
2019-09-13 01:10:08 +10:00
parent 52b619facc
commit cfe361c1a6
5 changed files with 84 additions and 5 deletions
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39
src/pse/gpu.cpp
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@ -103,7 +103,7 @@ u32 GPU::ReadGPUREAD()
void GPU::WriteGP0(u32 value)
{
m_GP0_command.push_back(value);
Assert(m_GP0_command.size() <= 128);
Assert(m_GP0_command.size() <= 1048576);
const u8 command = Truncate8(m_GP0_command[0] >> 24);
const u32 param = m_GP0_command[0] & UINT32_C(0x00FFFFFF);
@ -121,6 +121,13 @@ void GPU::WriteGP0(u32 value)
case 0x00: // NOP
break;
case 0xA0: // Copy Rectangle CPU->VRAM
{
if (!HandleCopyRectangleCPUToVRAMCommand())
return;
}
break;
case 0xE1: // Set draw mode
{
// 0..10 bits match GPUSTAT
@ -288,6 +295,36 @@ bool GPU::HandleRenderCommand()
return true;
}
bool GPU::HandleCopyRectangleCPUToVRAMCommand()
{
if (m_GP0_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 num_pixels = copy_width * copy_height;
const u32 num_words = 3 + ((num_pixels + 1) / 2);
if (m_GP0_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;
Log_DebugPrintf("Copy rectangle from CPU to VRAM offset=(%u,%u), size=(%u,%u)", dst_x, dst_y, copy_width,
copy_height);
if ((dst_x + copy_width) > VRAM_WIDTH || (dst_y + copy_height) > VRAM_HEIGHT)
{
Panic("Out of bounds VRAM copy");
return true;
}
UpdateVRAM(dst_x, dst_y, copy_width, copy_height, &m_GP0_command[3]);
return true;
}
void GPU::UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void* data) {}
void GPU::DispatchRenderCommand(RenderCommand rc, u32 num_vertices) {}
void GPU::FlushRender() {}