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https://github.com/glfw/glfw.git
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132 lines
3.7 KiB
C
132 lines
3.7 KiB
C
//========================================================================
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// GLFW - An OpenGL library
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// Platform: Any
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// API version: 3.0
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// WWW: http://www.glfw.org/
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//------------------------------------------------------------------------
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// Copyright (c) 2010 Camilla Berglund <elmindreda@elmindreda.org>
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would
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// be appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//
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//========================================================================
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#include "internal.h"
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#if defined(_MSC_VER)
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#include <malloc.h>
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#endif
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//////////////////////////////////////////////////////////////////////////
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////// GLFW internal API //////
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//////////////////////////////////////////////////////////////////////////
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void _glfwAllocGammaArrays(GLFWgammaramp* ramp, unsigned int size)
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{
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ramp->red = calloc(size, sizeof(unsigned short));
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ramp->green = calloc(size, sizeof(unsigned short));
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ramp->blue = calloc(size, sizeof(unsigned short));
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ramp->size = size;
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}
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void _glfwFreeGammaArrays(GLFWgammaramp* ramp)
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{
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free(ramp->red);
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free(ramp->green);
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free(ramp->blue);
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memset(ramp, 0, sizeof(GLFWgammaramp));
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}
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//////////////////////////////////////////////////////////////////////////
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////// GLFW public API //////
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//////////////////////////////////////////////////////////////////////////
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GLFWAPI void glfwSetGamma(GLFWmonitor* handle, float gamma)
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{
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int i;
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unsigned short values[256];
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GLFWgammaramp ramp;
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_GLFW_REQUIRE_INIT();
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if (gamma <= 0.f)
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{
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_glfwInputError(GLFW_INVALID_VALUE,
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"Gamma value must be greater than zero");
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return;
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}
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for (i = 0; i < 256; i++)
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{
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float value;
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// Calculate intensity
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value = i / 255.f;
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// Apply gamma curve
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value = (float) pow(value, 1.f / gamma) * 65535.f + 0.5f;
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// Clamp to value range
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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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values[i] = (unsigned short) value;
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}
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ramp.red = values;
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ramp.green = values;
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ramp.blue = values;
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ramp.size = 256;
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glfwSetGammaRamp(handle, &ramp);
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}
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GLFWAPI const GLFWgammaramp* glfwGetGammaRamp(GLFWmonitor* handle)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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_GLFW_REQUIRE_INIT_OR_RETURN(NULL);
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_glfwFreeGammaArrays(&monitor->currentRamp);
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_glfwPlatformGetGammaRamp(monitor, &monitor->currentRamp);
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return &monitor->currentRamp;
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}
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GLFWAPI void glfwSetGammaRamp(GLFWmonitor* handle, const GLFWgammaramp* ramp)
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{
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_GLFWmonitor* monitor = (_GLFWmonitor*) handle;
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_GLFW_REQUIRE_INIT();
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if (!monitor->originalRamp.size)
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_glfwPlatformGetGammaRamp(monitor, &monitor->originalRamp);
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_glfwPlatformSetGammaRamp(monitor, ramp);
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}
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