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GPU: Let the GPU drive DMA transfers for large time slices

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Fixes FMV breakage... again.
This commit is contained in:
Connor McLaughlin
2020-03-26 00:13:20 +10:00
parent d4ae0f13fe
commit 54abd37daa
4 changed files with 45 additions and 36 deletions
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18
src/core/gpu.h
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@ -133,6 +133,12 @@ public:
void DMARead(u32* words, u32 word_count);
void DMAWrite(const u32* words, u32 word_count);
/// Returns the number of pending GPU ticks.
TickCount GetPendingGPUTicks() const;
/// Returns true if enough ticks have passed for the raster to be on the next line.
bool IsRasterScanlinePending() const;
// Synchronizes the CRTC, updating the hblank timer.
void Synchronize();
@ -152,6 +158,12 @@ public:
static std::unique_ptr<GPU> CreateSoftwareRenderer();
protected:
static TickCount GPUTicksToSystemTicks(TickCount gpu_ticks)
{
// convert to master clock, rounding up as we want to overshoot not undershoot
return static_cast<TickCount>((static_cast<u32>(gpu_ticks) * 7u + 10u) / 11u);
}
// Helper/format conversion functions.
static constexpr u8 Convert5To8(u8 x5) { return (x5 << 3) | (x5 & 7); }
static constexpr u8 Convert8To5(u8 x8) { return (x8 >> 3); }
@ -311,12 +323,6 @@ protected:
// Ticks for hblank/vblank.
void Execute(TickCount ticks);
/// Returns the number of pending GPU ticks.
TickCount GetPendingGPUTicks() const;
/// Returns true if enough ticks have passed for the raster to be on the next line.
bool IsRasterScanlinePending() const;
/// Returns true if scanout should be interlaced.
bool IsDisplayInterlaced() const { return !m_force_progressive_scan && m_GPUSTAT.In480iMode(); }