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Added generic video mode selection.

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This commit is contained in:
Camilla Berglund 2012-12-31 03:04:04 +01:00
parent 52dac79219
commit cf42282cfb
2 changed files with 44 additions and 0 deletions
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3
src/internal.h
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@ -378,6 +378,9 @@ void _glfwInputMonitorChange(void);
//========================================================================
// Fullscren management (fullscreen.c)
const GLFWvidmode* _glfwChooseVideoMode(const GLFWvidmode* desired,
const GLFWvidmode* alternatives,
unsigned int count);
int _glfwCompareVideoModes(const GLFWvidmode* first, const GLFWvidmode* second);
void _glfwSplitBPP(int bpp, int* red, int* green, int* blue);

41
src/monitor.c
View File

@ -32,6 +32,8 @@
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#if defined(_MSC_VER)
#include <malloc.h>
#define strdup _strdup
@ -195,6 +197,45 @@ void _glfwDestroyMonitors(void)
}
//========================================================================
// Returns the video mode closest to the desired one
//========================================================================
const GLFWvidmode* _glfwChooseVideoMode(const GLFWvidmode* desired,
const GLFWvidmode* alternatives,
unsigned int count)
{
unsigned int i;
unsigned int sizeDiff, leastSizeDiff = UINT_MAX;
unsigned int colorDiff, leastColorDiff = UINT_MAX;
const GLFWvidmode* current;
const GLFWvidmode* closest = NULL;
for (i = 0; i < count; i++)
{
current = alternatives + i;
colorDiff = abs((current->redBits + current->greenBits + current->blueBits) -
(desired->redBits + desired->greenBits + desired->blueBits));
sizeDiff = abs((current->width - desired->width) *
(current->width - desired->width) +
(current->height - desired->height) *
(current->height - desired->height));
if ((colorDiff < leastColorDiff) ||
(colorDiff == leastColorDiff && sizeDiff < leastSizeDiff))
{
closest = current;
leastSizeDiff = sizeDiff;
leastColorDiff = colorDiff;
}
}
return closest;
}
//========================================================================
// Lexical comparison of GLFW video modes
//========================================================================