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Take into account the original gamma before applying gamma.

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This commit is contained in:
Tai Chi Minh Ralph Eastwood
2011-09-14 06:53:26 +01:00
parent 688772111d
commit 53f64983a9
3 changed files with 57 additions and 17 deletions
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src/gamma.c
+21 -7
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@@ -62,20 +62,34 @@ GLFWAPI void glfwSetGamma(float gamma)
for (i = 0; i < size; i++)
{
float value = (float) i / ((float) (size - 1));
int diffRed, diffGreen, diffBlue, newRed, newGreen, newBlue, pow1;
// Reference our gamma 1.0f
pow1 = value * 65535.f + 0.5;
// Apply gamma
value = (float) pow(value, 1.f / gamma) * 65535.f + 0.5f;
// Clamp values
if (value < 0.f)
value = 0.f;
else if (value > 65535.f)
value = 65535.f;
// Set the gamma ramp values
ramp.red[i] = (unsigned short) value;
ramp.green[i] = (unsigned short) value;
ramp.blue[i] = (unsigned short) value;
// Use original gamma as reference
diffRed = _glfwLibrary.originalRamp.red[i] - pow1;
diffGreen = _glfwLibrary.originalRamp.green[i] - pow1;
diffBlue = _glfwLibrary.originalRamp.blue[i] - pow1;
// Calculate new values
newRed = diffRed + (unsigned short) value;
newGreen = diffGreen + (unsigned short) value;
newBlue = diffBlue + (unsigned short) value;
// Set the gamma ramp values (whilst clamping)
ramp.red[i] = newRed > 65535 ? 65535 : newRed < 0 ? 0 : newRed;
ramp.green[i] = newGreen > 65535 ? 65535 : newGreen < 0 ? 0 : newGreen;
ramp.blue[i] = newBlue > 65535 ? 65535 : newBlue < 0 ? 0 : newBlue;
}
glfwSetGammaRamp(&ramp);