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GPU: Approxiate texture cache reload time for P8/C16 sprites

This commit is contained in:
Stenzek 2024-08-11 23:28:59 +10:00
parent db4e28f44c
commit abbb21ffec
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1 changed files with 33 additions and 1 deletions
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34
src/core/gpu.h
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@ -360,7 +360,39 @@ protected:
u32 ticks_per_row = drawn_width;
if (textured)
ticks_per_row += drawn_width;
{
switch (m_draw_mode.mode_reg.texture_mode)
{
case GPUTextureMode::Palette4Bit:
ticks_per_row += drawn_width;
break;
case GPUTextureMode::Palette8Bit:
{
// Texture cache reload every 2 pixels, reads in 8 bytes (assuming 4x2). Cache only reloads if the
// draw width is greater than 32, otherwise the cache hits between rows.
if (drawn_width >= 32)
ticks_per_row += (drawn_width / 4) * 8;
else
ticks_per_row += drawn_width;
}
break;
case GPUTextureMode::Direct16Bit:
case GPUTextureMode::Reserved_Direct16Bit:
{
// Same as above, except with 2x2 blocks instead of 4x2.
if (drawn_width >= 32)
ticks_per_row += (drawn_width / 2) * 8;
else
ticks_per_row += drawn_width;
}
break;
DefaultCaseIsUnreachable()
}
}
if (semitransparent || m_GPUSTAT.check_mask_before_draw)
ticks_per_row += (drawn_width + 1u) / 2u;
if (m_GPUSTAT.SkipDrawingToActiveField())