source: Daodan/src/daodan_gl.c@ 326

#include <windows.h>
#include <math.h>

#include "Oni.h"
#include "Oni_Persistence.h"
#include "Daodan_Utility.h"

#include "BFW_Utility.h"

#include "daodan_gl.h"
#include "oni_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 };

DEVMODE orig_devmode, cur_devmode, new_devmode;

void init_daodan_gl()
{
        memset(&orig_devmode, 0, sizeof(orig_devmode));
        orig_devmode.dmSize = sizeof(orig_devmode);
        
        if (!EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &orig_devmode))
        {
                orig_devmode.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT;
                orig_devmode.dmBitsPerPel = 32;
                orig_devmode.dmPelsWidth  = GetSystemMetrics(SM_CXSCREEN);
                orig_devmode.dmPelsHeight = GetSystemMetrics(SM_CYSCREEN);
        }
        
        memcpy(&cur_devmode, &orig_devmode, sizeof(orig_devmode));
        memcpy(&new_devmode, &orig_devmode, sizeof(orig_devmode));
}

void update_cdmode()
{
        if (!EnumDisplaySettings(NULL, ENUM_CURRENT_SETTINGS, &cur_devmode))
        {
                cur_devmode.dmFields = DM_BITSPERPEL | DM_PELSWIDTH | DM_PELSHEIGHT;
                cur_devmode.dmBitsPerPel = 32;
                cur_devmode.dmPelsWidth  = GetSystemMetrics(SM_CXSCREEN);
                cur_devmode.dmPelsHeight = GetSystemMetrics(SM_CYSCREEN);
        }
}

unsigned int ONICALL daodan_enumerate_valid_display_modes(M3tDisplayMode modes[max_modes])
{
        unsigned int vmodes = 0;
        unsigned int screen_x = orig_devmode.dmPelsWidth;
        unsigned int screen_y = orig_devmode.dmPelsHeight;
        
        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  = screen_x;
                modes[vmodes].Height = screen_y;
                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);
}

int daodan_set_display_mode(short width, short height, short depth)
{
        if (M3gResolutionSwitch)
        {
                DEVMODE new_devmode;
                new_devmode.dmSize = sizeof(new_devmode);
                new_devmode.dmFields = DM_BITSPERPEL | DM_PELSHEIGHT | DM_PELSWIDTH;
                new_devmode.dmPelsWidth = width;
                new_devmode.dmPelsHeight = height;
                new_devmode.dmBitsPerPel = depth;
                
                if (ChangeDisplaySettings(&new_devmode, CDS_TEST) != DISP_CHANGE_SUCCESSFUL)
                        return 0;
                
                if (ChangeDisplaySettings(&new_devmode, CDS_FULLSCREEN) != DISP_CHANGE_SUCCESSFUL)
                        return 0;
                
                update_cdmode();
                gl->DisplayMode.Width = cur_devmode.dmPelsWidth;
                gl->DisplayMode.Height = cur_devmode.dmPelsHeight;
                if (cur_devmode.dmBitsPerPel > depth)
                        gl->DisplayMode.Depth = cur_devmode.dmBitsPerPel;
        }
        else
        {
                update_cdmode();
                if (cur_devmode.dmBitsPerPel > depth)
                        gl->DisplayMode.Depth = cur_devmode.dmBitsPerPel;
        }
        return 1;
}

void daodan_set_gamma(float gamma)
{
        WORD ramp[3 * 256];
        int i;

        if (!gl_gamma_ramp_valid)
                return;

        gamma = (1.0f - gamma) * 1.2f + 0.4f;

        for (i = 0; i < sizeof(ramp); i++) 
        {
                int value = (int)(pow(gl_gamma_ramp[i] / 65535.0f, gamma) * 65535.0f);

                if (value < 0)
                        value = 0;
                else if (value > 65535)
                        value = 65535;

                ramp[i] = value;
        }
        
        if (gl_api->wglSetDeviceGammaRamp3DFX)
                gl_api->wglSetDeviceGammaRamp3DFX(gl->HDC, ramp);
        else
                SetDeviceGammaRamp(gl->HDC, ramp);
}

int ONICALL daodangl_platform_initialize()
{
        static M3tDisplayMode lastmode = {0, 0, 0, 0};
        
        if (lastmode.Width != gl->DisplayMode.Width || lastmode.Height != gl->DisplayMode.Height || lastmode.Depth != gl->DisplayMode.Depth)
                if (!daodan_set_display_mode(gl->DisplayMode.Width, gl->DisplayMode.Height, gl->DisplayMode.Depth))
                        if (gl->DisplayMode.Width != 640 || gl->DisplayMode.Height != 480 || gl->DisplayMode.Depth != 16)
                        {
                                gl->DisplayMode.Width = 640;
                                gl->DisplayMode.Height = 480;
                                if (!daodan_set_display_mode(640, 480, 16))
                                        goto exit_err;
                        }

        if (lastmode.Width != gl->DisplayMode.Width || lastmode.Height != gl->DisplayMode.Height)
        {
                RECT Rect;
                Rect.left = (GetSystemMetrics(SM_CXSCREEN) / 2) - (gl->DisplayMode.Width / 2);
                Rect.top = (GetSystemMetrics(SM_CYSCREEN) / 2) - (gl->DisplayMode.Height / 2);
                Rect.right = Rect.left + gl->DisplayMode.Width;
                Rect.bottom = Rect.top + gl->DisplayMode.Height;
                AdjustWindowRect(&Rect, WS_OVERLAPPED | WS_MAXIMIZEBOX | WS_MINIMIZEBOX, FALSE);
                
                SetWindowPos(ONgPlatformData.Window, NULL, Rect.left, Rect.top, Rect.right - Rect.left, Rect.bottom - Rect.top, SWP_NOACTIVATE | SWP_NOZORDER);
        }

        if (gl->HDC == NULL)
                if ((gl->HDC = GetDC(ONgPlatformData.Window)) == NULL)
                        goto exit_err;
        
        if (gl_api->wglGetDeviceGammaRamp3DFX != NULL)
        {
                DDrStartupMessage("Using 3DFX gamma adjustment");

                if (gl_api->wglGetDeviceGammaRamp3DFX(gl->HDC, gl_gamma_ramp))
                        gl_gamma_ramp_valid = 1;
        }
        else
        {
                DDrStartupMessage("Using standard Windows gamma adjustment");

                if (GetDeviceGammaRamp(gl->HDC, gl_gamma_ramp))
                        gl_gamma_ramp_valid = 1;
        }
        
//      if (gl_gamma_ramp_valid)
//              daodan_set_gamma(ONrPersist_GetGamma());  Its not working :(
//      else
                DDrStartupMessage("gamma adjustment not supported");
        
        if (!gl_platform_set_pixel_format(gl->HDC))
                if (gl->DisplayMode.Depth != 16)
                {
                        if (!daodan_set_display_mode(gl->DisplayMode.Width, gl->DisplayMode.Height, 16))
                                goto exit_err;
                        
                        if (!gl_platform_set_pixel_format(gl->HDC))
                                goto exit_err;
                }

        lastmode.Width = gl->DisplayMode.Width;
        lastmode.Height = gl->DisplayMode.Height;
        lastmode.Depth = gl->DisplayMode.Depth;
        
        return 0;

exit_err:
        AUrMessageBox(1, "Failed to initialize OpenGL contexts; Oni will now exit.");
        exit(0);
        return 1;
}