glfw/src/fullscreen.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/
//------------------------------------------------------------------------
// Copyright (c) 2002-2006 Marcus Geelnard
// Copyright (c) 2006-2010 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 <stdlib.h>
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//========================================================================
// Lexical comparison function for GLFW video modes, used by qsort
//========================================================================
static int compareVideoModes(const void* firstPtr, const void* secondPtr)
{
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int firstBPP, secondBPP, firstSize, secondSize;
GLFWvidmode* first = (GLFWvidmode*) firstPtr;
GLFWvidmode* second = (GLFWvidmode*) secondPtr;
// First sort on color bits per pixel
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firstBPP = first->redBits +
first->greenBits +
first->blueBits;
secondBPP = second->redBits +
second->greenBits +
second->blueBits;
if (firstBPP != secondBPP)
return firstBPP - secondBPP;
// Then sort on screen area, in pixels
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firstSize = first->width * first->height;
secondSize = second->width * second->height;
return firstSize - secondSize;
}
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//////////////////////////////////////////////////////////////////////////
////// GLFW internal API //////
//////////////////////////////////////////////////////////////////////////
//========================================================================
// Convert BPP to RGB bits based on "best guess"
//========================================================================
void _glfwSplitBPP(int bpp, int* red, int* green, int* blue)
{
int delta;
// We assume that by 32 they really meant 24
if (bpp == 32)
bpp = 24;
// Convert "bits per pixel" to red, green & blue sizes
*red = *green = *blue = bpp / 3;
delta = bpp - (*red * 3);
if (delta >= 1)
*green = *green + 1;
if (delta == 2)
*red = *red + 1;
}
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//////////////////////////////////////////////////////////////////////////
////// GLFW public API //////
//////////////////////////////////////////////////////////////////////////
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//========================================================================
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// Get a list of available video modes
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//========================================================================
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GLFWAPI int glfwGetVideoModes(GLFWvidmode* list, int maxcount)
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{
int count;
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if (!_glfwInitialized)
{
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_glfwSetError(GLFW_NOT_INITIALIZED, NULL);
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return 0;
}
if (maxcount <= 0 || list == NULL)
{
// TODO: Figure out if this is an error
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return 0;
}
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count = _glfwPlatformGetVideoModes(list, maxcount);
if (count > 0)
qsort(list, count, sizeof(GLFWvidmode), compareVideoModes);
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return count;
}
//========================================================================
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// Get the desktop video mode
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//========================================================================
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GLFWAPI void glfwGetDesktopMode(GLFWvidmode* mode)
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{
if (!_glfwInitialized)
{
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_glfwSetError(GLFW_NOT_INITIALIZED, NULL);
return;
}
if (mode == NULL)
{
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_glfwSetError(GLFW_INVALID_VALUE,
"glfwGetDesktopMode: Parameter 'mode' cannot be NULL");
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return;
}
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_glfwPlatformGetDesktopMode(mode);
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}