source: Daodan/src/daodan_gl.c@ 322

#include "daodan_gl.h"

#define max_modes (104) // Dirty hack to add more resolutions, it really should only be 16 ^_^
#define builtin_modes  (sizeof(daodan_reslist) / sizeof(M3tDisplayMode))
#define builtin_depths (sizeof(daodan_resdepths) / sizeof(short))

const M3tDisplayMode daodan_reslist[] = {
        { 720 , 480,  0, 0 },
        { 720 , 576,  0, 0 },
        { 768 , 480,  0, 0 },
        { 800 , 480,  0, 0 },
        { 852 , 480,  0, 0 },
        { 856 , 480,  0, 0 },
        { 960 , 540,  0, 0 },
        { 960 , 720,  0, 0 },
        { 1024, 576,  0, 0 },
        { 1024, 600,  0, 0 },
        { 1024, 640,  0, 0 },
        { 1024, 768,  0, 0 },
        { 1152, 768,  0, 0 },
        { 1152, 864,  0, 0 },
        { 1280, 720,  0, 0 },
        { 1280, 768,  0, 0 },
        { 1280, 800,  0, 0 },
        { 1280, 960,  0, 0 },
        { 1280, 1024, 0, 0 },
        { 1366, 768,  0, 0 },
        { 1400, 1050, 0, 0 },
        { 1440, 900,  0, 0 },
        { 1600, 900,  0, 0 },
        { 1600, 1200, 0, 0 },
        { 1920, 1080, 0, 0 },
        { 1920, 1440, 0, 0 },
};

const short daodan_resdepths[] = { 16, 32 };

unsigned int ONICALL daodan_enumerate_valid_display_modes(M3tDisplayMode modes[max_modes])
{
        unsigned int vmodes = 0;
        unsigned int screen_x = GetSystemMetrics(SM_CXSCREEN);
        unsigned int screen_y = GetSystemMetrics(SM_CYSCREEN);
        
        int i, j;
        
        for (i = 0; i < builtin_depths; i ++)
        {
                modes[vmodes].Width  = 640;
                modes[vmodes].Height = 480;
                modes[vmodes].Depth  = daodan_resdepths[i];
                
                if (++vmodes == max_modes - builtin_modes + i)
                        goto modesfull;
                
                for (j = 0; j < builtin_modes; j ++)
                        if (!(daodan_reslist[j].Width == 640 && daodan_reslist[j].Height == 480) && !(daodan_reslist[j].Width == screen_x && daodan_reslist[j].Height == screen_y) &&
                                ((daodan_reslist[j].Width < screen_x && daodan_reslist[j].Height < screen_y) || daodan_testmode(daodan_reslist[j])))
                        {
                                modes[vmodes].Width  = daodan_reslist[j].Width;
                                modes[vmodes].Height = daodan_reslist[j].Height;
                                modes[vmodes].Depth  = daodan_resdepths[i];
                                
                                if (++vmodes == max_modes - builtin_modes + i)
                                        goto modesfull;
                        }
                
                modes[vmodes].Width  = GetSystemMetrics(SM_CXSCREEN);
                modes[vmodes].Height = GetSystemMetrics(SM_CYSCREEN);
                modes[vmodes].Depth  = daodan_resdepths[i];
                
                if (++vmodes == max_modes - builtin_modes + i)
                        goto modesfull;
        }
        
        modesfull:
        return vmodes;
}

bool daodan_testmode(M3tDisplayMode mode)
{
        DEVMODE devmode;
        memset(&devmode, 0, sizeof(devmode));
        
        devmode.dmSize = sizeof(devmode);
        devmode.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT;
        devmode.dmBitsPerPel = mode.Depth;
        devmode.dmPelsWidth  = mode.Width;
        devmode.dmPelsHeight = mode.Height;
        
        return (ChangeDisplaySettings(&devmode, CDS_TEST) == DISP_CHANGE_SUCCESSFUL);
}