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Brought back non-relative gamma ramp generation.
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parent
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28
src/gamma.c
28
src/gamma.c
@ -62,34 +62,20 @@ GLFWAPI void glfwSetGamma(float gamma)
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for (i = 0; i < size; i++)
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{
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float value = (float) i / ((float) (size - 1));
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int diffRed, diffGreen, diffBlue, newRed, newGreen, newBlue, pow1;
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// Reference our gamma 1.0f
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pow1 = value * 65535.f + 0.5;
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// Apply gamma
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value = (float) pow(value, 1.f / gamma) * 65535.f + 0.5f;
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// Clamp values
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if (value < 0.f)
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value = 0.f;
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else if (value > 65535.f)
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value = 65535.f;
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// Use original gamma as reference
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diffRed = _glfwLibrary.originalRamp.red[i] - pow1;
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diffGreen = _glfwLibrary.originalRamp.green[i] - pow1;
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diffBlue = _glfwLibrary.originalRamp.blue[i] - pow1;
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// Calculate new values
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newRed = diffRed + (unsigned short) value;
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newGreen = diffGreen + (unsigned short) value;
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newBlue = diffBlue + (unsigned short) value;
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// Set the gamma ramp values (whilst clamping)
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ramp.red[i] = newRed > 65535 ? 65535 : newRed < 0 ? 0 : newRed;
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ramp.green[i] = newGreen > 65535 ? 65535 : newGreen < 0 ? 0 : newGreen;
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ramp.blue[i] = newBlue > 65535 ? 65535 : newBlue < 0 ? 0 : newBlue;
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// Set the gamma ramp values
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ramp.red[i] = (unsigned short) value;
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ramp.green[i] = (unsigned short) value;
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ramp.blue[i] = (unsigned short) value;
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}
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glfwSetGammaRamp(&ramp);
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