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Implemented hardware gamma support for macOS
Hardware gamma is limited to main display only, use shader-based correction for other displays
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a69182f9ef
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2 changed files with 36 additions and 1 deletions
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@ -1086,6 +1086,20 @@ SDLGLFB::SDLGLFB(void*, const int width, const int height, int, int, const bool
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, m_lock(-1)
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, m_isUpdatePending(false)
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{
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CGGammaValue gammaTable[GAMMA_TABLE_SIZE];
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uint32_t actualChannelSize;
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const CGError result = CGGetDisplayTransferByTable(kCGDirectMainDisplay, GAMMA_CHANNEL_SIZE,
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gammaTable, &gammaTable[GAMMA_CHANNEL_SIZE], &gammaTable[GAMMA_CHANNEL_SIZE * 2], &actualChannelSize);
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m_supportsGamma = kCGErrorSuccess == result && GAMMA_CHANNEL_SIZE == actualChannelSize;
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if (m_supportsGamma)
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{
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for (uint32_t i = 0; i < GAMMA_TABLE_SIZE; ++i)
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{
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m_originalGamma[i] = static_cast<WORD>(gammaTable[i] * 65535.0f);
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}
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}
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}
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SDLGLFB::SDLGLFB()
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@ -1169,10 +1183,26 @@ void SDLGLFB::SwapBuffers()
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void SDLGLFB::SetGammaTable(WORD* table)
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{
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if (m_supportsGamma)
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{
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CGGammaValue gammaTable[GAMMA_TABLE_SIZE];
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for (uint32_t i = 0; i < GAMMA_TABLE_SIZE; ++i)
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{
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gammaTable[i] = static_cast<CGGammaValue>(table[i] / 65535.0f);
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}
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CGSetDisplayTransferByTable(kCGDirectMainDisplay, GAMMA_CHANNEL_SIZE,
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gammaTable, &gammaTable[GAMMA_CHANNEL_SIZE], &gammaTable[GAMMA_CHANNEL_SIZE * 2]);
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}
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}
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void SDLGLFB::ResetGammaTable()
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{
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if (m_supportsGamma)
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{
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SetGammaTable(m_originalGamma);
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}
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}
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int SDLGLFB::GetClientWidth()
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@ -71,7 +71,12 @@ protected:
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int m_lock;
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bool m_isUpdatePending;
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static const bool m_supportsGamma = false;
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static const uint32_t GAMMA_CHANNEL_SIZE = 256;
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static const uint32_t GAMMA_CHANNEL_COUNT = 3;
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static const uint32_t GAMMA_TABLE_SIZE = GAMMA_CHANNEL_SIZE * GAMMA_CHANNEL_COUNT;
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bool m_supportsGamma;
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WORD m_originalGamma[GAMMA_TABLE_SIZE];
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SDLGLFB();
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