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PPU: Implement brightness control

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This commit is contained in:
Sour 2019-02-22 22:31:20 -05:00
parent dbfed2bb46
commit f028518664
2 changed files with 15 additions and 3 deletions
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17
Core/Ppu.cpp
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@ -314,6 +314,7 @@ void Ppu::RenderScanline()
}
ApplyColorMath();
ApplyBrightness();
//Process sprites for next scanline
memset(_spritePriority, 0xFF, sizeof(_spritePriority));
@ -627,7 +628,6 @@ void Ppu::ApplyColorMath()
otherPixel = _fixedColor;
}
if(_colorMathSubstractMode) {
uint16_t r = std::max((mainPixel & 0x001F) - (otherPixel & 0x001F), 0) >> halfShift;
uint16_t g = std::max(((mainPixel >> 5) & 0x001F) - ((otherPixel >> 5) & 0x001F), 0) >> halfShift;
@ -645,6 +645,19 @@ void Ppu::ApplyColorMath()
}
}
void Ppu::ApplyBrightness()
{
if(_screenBrightness != 15) {
for(int x = 0; x < 256; x++) {
uint16_t &pixel = _currentBuffer[(_scanline << 8) | x];
uint16_t r = (pixel & 0x1F) * _screenBrightness / 15;
uint16_t g = ((pixel >> 5) & 0x1F) * _screenBrightness / 15;
uint16_t b = ((pixel >> 10) & 0x1F) * _screenBrightness / 15;
pixel = r | (g << 5) | (b << 10);
}
}
}
template<uint8_t layerIndex>
bool Ppu::ProcessMaskWindow(uint8_t activeWindowCount, int x)
{
@ -830,8 +843,6 @@ void Ppu::Write(uint32_t addr, uint8_t value)
switch(addr) {
case 0x2100:
_forcedVblank = (value & 0x80) != 0;
//TODO Apply brightness
_screenBrightness = value & 0x0F;
//TODO : Also, writing this register on the first line of V-Blank (225 or 240, depending on overscan) when force blank is currently active causes the OAM Address Reset to occur.

1
Core/Ppu.h
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@ -158,6 +158,7 @@ private:
void RenderScanline();
void ApplyColorMath();
void ApplyBrightness();
template<uint8_t layerIndex>
bool ProcessMaskWindow(uint8_t activeWindowCount, int x);