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GPU: Handle oversized transfers (wrap around behavior)

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This commit is contained in:
Connor McLaughlin
2019-11-14 20:31:48 +10:00
parent 9ea7a8418c
commit 9d66638bce
6 changed files with 49 additions and 26 deletions
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30
src/core/gpu.cpp
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@ -698,7 +698,35 @@ void GPU::ReadVRAM(u32 x, u32 y, u32 width, u32 height) {}
void GPU::FillVRAM(u32 x, u32 y, u32 width, u32 height, u32 color) {}
void GPU::UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void* data) {}
void GPU::UpdateVRAM(u32 x, u32 y, u32 width, u32 height, const void* data)
{
// Fast path when the copy is not oversized.
if ((x + width) <= VRAM_WIDTH && (y + height) <= VRAM_HEIGHT)
{
const u16* src_ptr = static_cast<const u16*>(data);
u16* dst_ptr = &m_vram_ptr[y * VRAM_WIDTH + x];
for (u32 yoffs = 0; yoffs < height; yoffs++)
{
std::copy_n(src_ptr, width, dst_ptr);
src_ptr += width;
dst_ptr += VRAM_WIDTH;
}
}
else
{
// Slow path when we need to handle wrap-around.
const u16* src_ptr = static_cast<const u16*>(data);
for (u32 row = 0; row < height;)
{
u16* dst_row_ptr = &m_vram_ptr[((y + row++) % VRAM_HEIGHT) * VRAM_WIDTH];
for (u32 col = 0; col < width;)
{
// TODO: Handle unaligned reads...
dst_row_ptr[(x + col++) % VRAM_WIDTH] = *(src_ptr++);
}
}
}
}
void GPU::CopyVRAM(u32 src_x, u32 src_y, u32 dst_x, u32 dst_y, u32 width, u32 height) {}