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GPU: Implement interlaced VRAM fills

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This commit is contained in:
Connor McLaughlin
2020-04-04 00:11:39 +10:00
parent 2aecb570c1
commit c483a78889
13 changed files with 155 additions and 39 deletions
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22
src/core/gpu.cpp
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@ -893,7 +893,7 @@ void GPU::ReadVRAM(u32 x, u32 y, u32 width, u32 height) {}
void GPU::FillVRAM(u32 x, u32 y, u32 width, u32 height, u32 color)
{
const u16 color16 = RGBA8888ToRGBA5551(color);
if ((x + width) <= VRAM_WIDTH)
if ((x + width) <= VRAM_WIDTH && !IsInterlacedRenderingEnabled())
{
for (u32 yoffs = 0; yoffs < height; yoffs++)
{
@ -901,6 +901,26 @@ void GPU::FillVRAM(u32 x, u32 y, u32 width, u32 height, u32 color)
std::fill_n(&m_vram_ptr[row * VRAM_WIDTH + x], width, color16);
}
}
else if (IsInterlacedRenderingEnabled())
{
// Hardware tests show that fills seem to break on the first two lines when the offset matches the displayed field.
if (IsRasterScanlinePending())
Synchronize();
const u32 active_field = GetInterlacedField();
for (u32 yoffs = 0; yoffs < height; yoffs++)
{
const u32 row = (y + yoffs) % VRAM_HEIGHT;
if ((row & u32(1)) == active_field)
continue;
u16* row_ptr = &m_vram_ptr[row * VRAM_WIDTH];
for (u32 xoffs = 0; xoffs < width; xoffs++)
{
const u32 col = (x + xoffs) % VRAM_WIDTH;
row_ptr[col] = color16;
}
}
}
else
{
for (u32 yoffs = 0; yoffs < height; yoffs++)