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Fix glfwSetGamma generating ramps of invalid sizes

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This makes glfwSetGamma generate a gamma ramp of the same size as the
monitor's current ramp, which will avoid failure on non-256 entry
monitors on X11 and avoid ramp interpolation on macOS.

Closes #1387.
Fixes #1388.
This commit is contained in:
Camilla Löwy
2018-12-17 17:40:18 +01:00
parent 52c7a4fc7f
commit 3531c320af
3 changed files with 20 additions and 10 deletions
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include/GLFW/glfw3.h
+5 -5
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@@ -2156,9 +2156,9 @@ GLFWAPI const GLFWvidmode* glfwGetVideoMode(GLFWmonitor* monitor);
/*! @brief Generates a gamma ramp and sets it for the specified monitor.
*
* This function generates a 256-element gamma ramp from the specified exponent
* and then calls @ref glfwSetGammaRamp with it. The value must be a finite
* number greater than zero.
* This function generates an appropriately sized gamma ramp from the specified
* exponent and then calls @ref glfwSetGammaRamp with it. The value must be
* a finite number greater than zero.
*
* The software controlled gamma ramp is applied _in addition_ to the hardware
* gamma correction, which today is usually an approximation of sRGB gamma.
@@ -2237,8 +2237,8 @@ GLFWAPI const GLFWgammaramp* glfwGetGammaRamp(GLFWmonitor* monitor);
* @errors Possible errors include @ref GLFW_NOT_INITIALIZED and @ref
* GLFW_PLATFORM_ERROR.
*
* @remark Gamma ramp sizes other than 256 are not supported by all platforms
* or graphics hardware.
* @remark The size of the specified gamma ramp should match the size of the
* current ramp for that monitor.
*
* @remark @win32 The gamma ramp size must be 256.
*