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Implemented hardware gamma support for macOS

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Hardware gamma is limited to main display only, use shader-based correction for other displays
This commit is contained in:
alexey.lysiuk 2016-07-31 12:19:08 +03:00
parent a69182f9ef
commit d3457f4508
2 changed files with 36 additions and 1 deletions
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30
src/posix/cocoa/i_video.mm
View file

@ -1086,6 +1086,20 @@ SDLGLFB::SDLGLFB(void*, const int width, const int height, int, int, const bool
, m_lock(-1)
, m_isUpdatePending(false)
{
CGGammaValue gammaTable[GAMMA_TABLE_SIZE];
uint32_t actualChannelSize;
const CGError result = CGGetDisplayTransferByTable(kCGDirectMainDisplay, GAMMA_CHANNEL_SIZE,
gammaTable, &gammaTable[GAMMA_CHANNEL_SIZE], &gammaTable[GAMMA_CHANNEL_SIZE * 2], &actualChannelSize);
m_supportsGamma = kCGErrorSuccess == result && GAMMA_CHANNEL_SIZE == actualChannelSize;
if (m_supportsGamma)
{
for (uint32_t i = 0; i < GAMMA_TABLE_SIZE; ++i)
{
m_originalGamma[i] = static_cast<WORD>(gammaTable[i] * 65535.0f);
}
}
}
SDLGLFB::SDLGLFB()
@ -1169,10 +1183,26 @@ void SDLGLFB::SwapBuffers()
void SDLGLFB::SetGammaTable(WORD* table)
{
if (m_supportsGamma)
{
CGGammaValue gammaTable[GAMMA_TABLE_SIZE];
for (uint32_t i = 0; i < GAMMA_TABLE_SIZE; ++i)
{
gammaTable[i] = static_cast<CGGammaValue>(table[i] / 65535.0f);
}
CGSetDisplayTransferByTable(kCGDirectMainDisplay, GAMMA_CHANNEL_SIZE,
gammaTable, &gammaTable[GAMMA_CHANNEL_SIZE], &gammaTable[GAMMA_CHANNEL_SIZE * 2]);
}
}
void SDLGLFB::ResetGammaTable()
{
if (m_supportsGamma)
{
SetGammaTable(m_originalGamma);
}
}
int SDLGLFB::GetClientWidth()

7
src/posix/cocoa/sdlglvideo.h
View file

@ -71,7 +71,12 @@ protected:
int m_lock;
bool m_isUpdatePending;
static const bool m_supportsGamma = false;
static const uint32_t GAMMA_CHANNEL_SIZE = 256;
static const uint32_t GAMMA_CHANNEL_COUNT = 3;
static const uint32_t GAMMA_TABLE_SIZE = GAMMA_CHANNEL_SIZE * GAMMA_CHANNEL_COUNT;
bool m_supportsGamma;
WORD m_originalGamma[GAMMA_TABLE_SIZE];
SDLGLFB();