AnimTestbed/3rdparty/ozz-animation/extern/glfw/lib/win32/win32_fullscreen.c

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2021-11-11 21:22:24 +01:00
//========================================================================
// GLFW - An OpenGL framework
// Platform: Win32/WGL
// API version: 2.7
// 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"
//************************************************************************
//**** GLFW internal functions ****
//************************************************************************
//========================================================================
// Convert BPP to RGB bits based on "best guess"
//========================================================================
static void bpp2rgb( int bpp, int *r, int *g, int *b )
{
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
*r = *g = *b = bpp / 3;
delta = bpp - (*r * 3);
if( delta >= 1 )
{
*g = *g + 1;
}
if( delta == 2 )
{
*r = *r + 1;
}
}
//========================================================================
// Return closest video mode by dimensions, refresh rate and bits per pixel
//========================================================================
int _glfwGetClosestVideoModeBPP( int *w, int *h, int *bpp, int *refresh )
{
int mode, bestmode, match, bestmatch, rr, bestrr, success;
DEVMODE dm;
// Find best match
bestmatch = 0x7fffffff;
bestrr = 0x7fffffff;
mode = bestmode = 0;
do
{
dm.dmSize = sizeof( DEVMODE );
success = EnumDisplaySettings( NULL, mode, &dm );
if( success )
{
match = dm.dmBitsPerPel - *bpp;
if( match < 0 ) match = -match;
match = ( match << 25 ) |
( (dm.dmPelsWidth - *w) *
(dm.dmPelsWidth - *w) +
(dm.dmPelsHeight - *h) *
(dm.dmPelsHeight - *h) );
if( match < bestmatch )
{
bestmatch = match;
bestmode = mode;
bestrr = (dm.dmDisplayFrequency - *refresh) *
(dm.dmDisplayFrequency - *refresh);
}
else if( match == bestmatch && *refresh > 0 )
{
rr = (dm.dmDisplayFrequency - *refresh) *
(dm.dmDisplayFrequency - *refresh);
if( rr < bestrr )
{
bestmatch = match;
bestmode = mode;
bestrr = rr;
}
}
}
mode ++;
}
while( success );
// Get the parameters for the best matching display mode
dm.dmSize = sizeof( DEVMODE );
(void) EnumDisplaySettings( NULL, bestmode, &dm );
// Fill out actual width and height
*w = dm.dmPelsWidth;
*h = dm.dmPelsHeight;
// Return bits per pixel
*bpp = dm.dmBitsPerPel;
// Return vertical refresh rate
*refresh = dm.dmDisplayFrequency;
return bestmode;
}
//========================================================================
// Return closest video mode by dimensions, refresh rate and channel sizes
//========================================================================
static int getClosestVideoMode( int *w, int *h,
int *r, int *g, int *b,
int *refresh )
{
int bpp, bestmode;
// Colorbits = sum of red/green/blue bits
bpp = *r + *g + *b;
// If colorbits < 15 (e.g. 0) or >= 24, default to 32 bpp
if( bpp < 15 || bpp >= 24 )
{
bpp = 32;
}
// Find best match
bestmode = _glfwGetClosestVideoModeBPP( w, h, &bpp, refresh );
// Convert "bits per pixel" to red, green & blue sizes
bpp2rgb( bpp, r, g, b );
return bestmode;
}
//========================================================================
// Change the current video mode
//========================================================================
void _glfwSetVideoModeMODE( int mode )
{
DEVMODE dm;
int success;
// Get the parameters for the best matching display mode
dm.dmSize = sizeof( DEVMODE );
(void) EnumDisplaySettings( NULL, mode, &dm );
// Set which fields we want to specify
dm.dmFields = DM_PELSWIDTH | DM_PELSHEIGHT | DM_BITSPERPEL;
// Do we have a prefered refresh rate?
if( _glfwWin.desiredRefreshRate > 0 )
{
dm.dmFields = dm.dmFields | DM_DISPLAYFREQUENCY;
dm.dmDisplayFrequency = _glfwWin.desiredRefreshRate;
}
// Change display setting
dm.dmSize = sizeof( DEVMODE );
success = ChangeDisplaySettings( &dm, CDS_FULLSCREEN );
// If the mode change was not possible, query the current display
// settings (we'll use the desktop resolution for fullscreen mode)
if( success == DISP_CHANGE_SUCCESSFUL )
{
_glfwWin.modeID = mode;
}
else
{
_glfwWin.modeID = ENUM_REGISTRY_SETTINGS;
EnumDisplaySettings( NULL, ENUM_REGISTRY_SETTINGS, &dm );
}
// Set the window size to that of the display mode
_glfwWin.width = dm.dmPelsWidth;
_glfwWin.height = dm.dmPelsHeight;
}
//========================================================================
// Change the current video mode
//========================================================================
void _glfwSetVideoMode( int *w, int *h, int r, int g, int b, int refresh )
{
int bestmode;
// Find a best match mode
bestmode = getClosestVideoMode( w, h, &r, &g, &b, &refresh );
// Change mode
_glfwSetVideoModeMODE( bestmode );
}
//************************************************************************
//**** GLFW user functions ****
//************************************************************************
//========================================================================
// Get a list of available video modes
//========================================================================
int _glfwPlatformGetVideoModes( GLFWvidmode *list, int maxcount )
{
int count, success, mode, i, j;
int m1 = 0, m2 = 0, bpp, r, g, b;
DEVMODE dm;
// Loop through all video modes and extract all the UNIQUE modes
count = 0;
mode = 0;
do
{
// Get video mode properties
dm.dmSize = sizeof( DEVMODE );
success = EnumDisplaySettings( NULL, mode, &dm );
// Is it a valid mode? (only list depths >= 15 bpp)
if( success && dm.dmBitsPerPel >= 15 )
{
// Convert to RGB, and back to bpp ("mask out" alpha bits etc)
bpp2rgb( dm.dmBitsPerPel, &r, &g, &b );
bpp = r + g + b;
// Mode "code" for this mode
m1 = (bpp << 25) | (dm.dmPelsWidth * dm.dmPelsHeight);
// Insert mode in list (sorted), and avoid duplicates
for( i = 0; i < count; i ++ )
{
// Mode "code" for already listed mode
bpp = list[i].RedBits + list[i].GreenBits +
list[i].BlueBits;
m2 = (bpp << 25) | (list[i].Width * list[i].Height);
if( m1 <= m2 )
{
break;
}
}
// New entry at the end of the list?
if( i >= count )
{
list[count].Width = dm.dmPelsWidth;
list[count].Height = dm.dmPelsHeight;
list[count].RedBits = r;
list[count].GreenBits = g;
list[count].BlueBits = b;
count ++;
}
// Insert new entry in the list?
else if( m1 < m2 )
{
for( j = count; j > i; j -- )
{
list[j] = list[j-1];
}
list[i].Width = dm.dmPelsWidth;
list[i].Height = dm.dmPelsHeight;
list[i].RedBits = r;
list[i].GreenBits = g;
list[i].BlueBits = b;
count ++;
}
}
mode ++;
}
while( success && (count < maxcount) );
return count;
}
//========================================================================
// Get the desktop video mode
//========================================================================
void _glfwPlatformGetDesktopMode( GLFWvidmode *mode )
{
DEVMODE dm;
// Get desktop display mode
dm.dmSize = sizeof( DEVMODE );
(void) EnumDisplaySettings( NULL, ENUM_REGISTRY_SETTINGS, &dm );
// Return desktop mode parameters
mode->Width = dm.dmPelsWidth;
mode->Height = dm.dmPelsHeight;
bpp2rgb( dm.dmBitsPerPel, &mode->RedBits, &mode->GreenBits, &mode->BlueBits );
}