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117 lines
3.5 KiB
C
117 lines
3.5 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 <string.h>
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//////////////////////////////////////////////////////////////////////////
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////// GLFW public API //////
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//////////////////////////////////////////////////////////////////////////
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//========================================================================
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// Calculate a gamma ramp from the specified value and set it
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//========================================================================
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GLFWAPI void glfwSetGamma(float gamma)
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{
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int i, size = GLFW_GAMMA_RAMP_SIZE;
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GLFWgammaramp ramp;
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if (!_glfwInitialized)
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{
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_glfwSetError(GLFW_NOT_INITIALIZED, NULL);
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return;
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}
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if (gamma <= 0.f)
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{
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_glfwSetError(GLFW_INVALID_VALUE,
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"glfwSetGamma: Gamma value must be greater than zero");
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return;
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}
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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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// 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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// 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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}
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//========================================================================
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// Return the cached currently set gamma ramp
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//========================================================================
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GLFWAPI void glfwGetGammaRamp(GLFWgammaramp* ramp)
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{
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if (!_glfwInitialized)
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{
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_glfwSetError(GLFW_NOT_INITIALIZED, NULL);
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return;
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}
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*ramp = _glfwLibrary.currentRamp;
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}
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//========================================================================
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// Make the specified gamma ramp current
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//========================================================================
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GLFWAPI void glfwSetGammaRamp(const GLFWgammaramp* ramp)
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{
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if (!_glfwInitialized)
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{
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_glfwSetError(GLFW_NOT_INITIALIZED, NULL);
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return;
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}
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_glfwPlatformSetGammaRamp(ramp);
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_glfwLibrary.currentRamp = *ramp;
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}
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