mirror of
https://github.com/gwm17/glfw.git
synced 2024-10-08 15:17:25 -04:00
99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
//========================================================================
|
|
// GLFW - An OpenGL library
|
|
// Platform: Any
|
|
// API version: 3.0
|
|
// WWW: http://www.glfw.org/
|
|
//------------------------------------------------------------------------
|
|
// Copyright (c) 2010 Camilla Berglund <elmindreda@elmindreda.org>
|
|
//
|
|
// This software is provided 'as-is', without any express or implied
|
|
// warranty. In no event will the authors be held liable for any damages
|
|
// arising from the use of this software.
|
|
//
|
|
// Permission is granted to anyone to use this software for any purpose,
|
|
// including commercial applications, and to alter it and redistribute it
|
|
// freely, subject to the following restrictions:
|
|
//
|
|
// 1. The origin of this software must not be misrepresented; you must not
|
|
// claim that you wrote the original software. If you use this software
|
|
// in a product, an acknowledgment in the product documentation would
|
|
// be appreciated but is not required.
|
|
//
|
|
// 2. Altered source versions must be plainly marked as such, and must not
|
|
// be misrepresented as being the original software.
|
|
//
|
|
// 3. This notice may not be removed or altered from any source
|
|
// distribution.
|
|
//
|
|
//========================================================================
|
|
|
|
#include "internal.h"
|
|
|
|
#include <math.h>
|
|
#include <string.h>
|
|
|
|
|
|
//////////////////////////////////////////////////////////////////////////
|
|
////// GLFW public API //////
|
|
//////////////////////////////////////////////////////////////////////////
|
|
|
|
GLFWAPI void glfwSetGamma(GLFWmonitor* handle, float gamma)
|
|
{
|
|
int i, size = GLFW_GAMMA_RAMP_SIZE;
|
|
GLFWgammaramp ramp;
|
|
|
|
_GLFW_REQUIRE_INIT();
|
|
|
|
if (gamma <= 0.f)
|
|
{
|
|
_glfwInputError(GLFW_INVALID_VALUE,
|
|
"Gamma value must be greater than zero");
|
|
return;
|
|
}
|
|
|
|
for (i = 0; i < size; i++)
|
|
{
|
|
float value;
|
|
|
|
// Calculate intensity
|
|
value = (float) i / (float) (size - 1);
|
|
// Apply gamma curve
|
|
value = (float) pow(value, 1.f / gamma) * 65535.f + 0.5f;
|
|
|
|
// Clamp to value range
|
|
if (value < 0.f)
|
|
value = 0.f;
|
|
else if (value > 65535.f)
|
|
value = 65535.f;
|
|
|
|
ramp.red[i] = (unsigned short) value;
|
|
ramp.green[i] = (unsigned short) value;
|
|
ramp.blue[i] = (unsigned short) value;
|
|
}
|
|
|
|
glfwSetGammaRamp(handle, &ramp);
|
|
}
|
|
|
|
GLFWAPI void glfwGetGammaRamp(GLFWmonitor* handle, GLFWgammaramp* ramp)
|
|
{
|
|
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
|
|
_GLFW_REQUIRE_INIT();
|
|
_glfwPlatformGetGammaRamp(monitor, ramp);
|
|
}
|
|
|
|
GLFWAPI void glfwSetGammaRamp(GLFWmonitor* handle, const GLFWgammaramp* ramp)
|
|
{
|
|
_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
|
|
|
|
_GLFW_REQUIRE_INIT();
|
|
|
|
if (!monitor->rampChanged)
|
|
{
|
|
_glfwPlatformGetGammaRamp(monitor, &monitor->originalRamp);
|
|
monitor->rampChanged = GL_TRUE;
|
|
}
|
|
|
|
_glfwPlatformSetGammaRamp(monitor, ramp);
|
|
}
|
|
|