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98 lines
2.9 KiB
98 lines
2.9 KiB
//======================================================================== |
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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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GLFWAPI void glfwSetGamma(GLFWmonitor* handle, 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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_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 < size; i++) |
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{ |
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float value; |
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// Calculate intensity |
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value = (float) i / (float) (size - 1); |
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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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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(handle, &ramp); |
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} |
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GLFWAPI void glfwGetGammaRamp(GLFWmonitor* handle, 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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_glfwPlatformGetGammaRamp(monitor, ramp); |
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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->rampChanged) |
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{ |
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_glfwPlatformGetGammaRamp(monitor, &monitor->originalRamp); |
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monitor->rampChanged = GL_TRUE; |
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} |
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_glfwPlatformSetGammaRamp(monitor, ramp); |
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} |
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