view test/graywin.c @ 1768:814f9f2c7a33

Fixed bug #80 Date: 21 Apr 2003 17:20:20 +0100 From: Alan Swanson <swanson@uklinux.net> Subject: [SDL] New XFree 4.3 Video Mode Patch If you look at the unsorted list of modes returned by X, here's mine; 1280 x 1024 @ 85.0 > 1024 x 768 @ 100.3 > USER 800 x 600 @ 125.5 > SET 640 x 480 @ 124.9 > 1280 x 1024 @ 75.0 ] 1280 x 1024 @ 60.0 ] 1280 x 960 @ 85.0 ] X11 1280 x 960 @ 60.0 ] AUTO 1152 x 864 @ 75.0 ]=20 1152 x 768 @ 54.8 ] 960 x 720 @ 120.0 ] ... 640 x 400 @ 85.1 ] 256k 576 x 432 @ 150.0 ] 249k PIXEL 640 x 350 @ 85.1 ] 224k COUNT 576 x 384 @ 109.6 ] 221k ... The user set modes come first followed by X set modes which are ordered by decreasing number of pixels and refresh. The reason why every other library or program not using SDL working is due to SDL scanning the modes in reverse getting X11 provided modes modes with the lowest refresh.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 05 May 2006 05:50:26 +0000
parents d33645c36072
children 782fd950bd46 c121d94672cb
line wrap: on
line source


/* Simple program:  Fill a colormap with gray and stripe it down the screen */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "SDL.h"

#ifdef TEST_VGA16 /* Define this if you want to test VGA 16-color video modes */
#define NUM_COLORS	16
#else
#define NUM_COLORS	256
#endif

/* Draw a randomly sized and colored box centered about (X,Y) */
void DrawBox(SDL_Surface *screen, int X, int Y, int width, int height)
{
	static unsigned int seeded = 0;
	SDL_Rect area;
	Uint32 color;
        Uint32 randc;

	/* Seed the random number generator */
	if ( seeded == 0 ) {
		srand(time(NULL));
		seeded = 1;
	}

	/* Get the bounds of the rectangle */
	area.w = (rand()%width);
	area.h = (rand()%height);
	area.x = X-(area.w/2);
	area.y = Y-(area.h/2);
        randc = (rand()%NUM_COLORS);

        if (screen->format->BytesPerPixel==1)
        {
            color = randc;
        }
        else
        {
            color = SDL_MapRGB(screen->format, randc, randc, randc);
        }

	/* Do it! */
	SDL_FillRect(screen, &area, color);
	if ( screen->flags & SDL_DOUBLEBUF ) {
		SDL_Flip(screen);
	} else {
		SDL_UpdateRects(screen, 1, &area);
	}
}

void DrawBackground(SDL_Surface *screen)
{
	int i, j, k;
	Uint8  *buffer;
	Uint16 *buffer16;
        Uint16 color;
        Uint8  gradient;

	/* Set the surface pixels and refresh! */
	/* Use two loops in case the surface is double-buffered (both sides) */

	for ( j=0; j<2; ++j ) {
		if ( SDL_LockSurface(screen) < 0 ) {
			fprintf(stderr, "Couldn't lock display surface: %s\n",
								SDL_GetError());
			return;
		}
		buffer = (Uint8 *)screen->pixels;

		if (screen->format->BytesPerPixel!=2) {
			for ( i=0; i<screen->h; ++i ) {
				memset(buffer,(i*(NUM_COLORS-1))/screen->h, screen->w * screen->format->BytesPerPixel);
				buffer += screen->pitch;
			}
		}
                else
                {
			for ( i=0; i<screen->h; ++i ) {
				gradient=((i*(NUM_COLORS-1))/screen->h);
                                color = SDL_MapRGB(screen->format, gradient, gradient, gradient);
                                buffer16=(Uint16*)buffer;
                                for (k=0; k<screen->w; k++)
                                {
                                   *(buffer16+k)=color;
                                }
				buffer += screen->pitch;
			}
                }

		SDL_UnlockSurface(screen);
		if ( screen->flags & SDL_DOUBLEBUF ) {
			SDL_Flip(screen);
		} else {
			SDL_UpdateRect(screen, 0, 0, 0, 0);
                        break;
		}
	}
}

SDL_Surface *CreateScreen(Uint16 w, Uint16 h, Uint8 bpp, Uint32 flags)
{
	SDL_Surface *screen;
	int i;
	SDL_Color palette[NUM_COLORS];

	/* Set the video mode */
	screen = SDL_SetVideoMode(w, h, bpp, flags);
	if ( screen == NULL ) {
		fprintf(stderr, "Couldn't set display mode: %s\n",
							SDL_GetError());
		return(NULL);
	}
	fprintf(stderr, "Screen is in %s mode\n",
		(screen->flags & SDL_FULLSCREEN) ? "fullscreen" : "windowed");

	if (bpp==8) {
		/* Set a gray colormap, reverse order from white to black */
		for ( i=0; i<NUM_COLORS; ++i ) {
			palette[i].r = (NUM_COLORS-1)-i * (256 / NUM_COLORS);
			palette[i].g = (NUM_COLORS-1)-i * (256 / NUM_COLORS);
			palette[i].b = (NUM_COLORS-1)-i * (256 / NUM_COLORS);
		}
		SDL_SetColors(screen, palette, 0, NUM_COLORS);
	}

	return(screen);
}

int main(int argc, char *argv[])
{
	SDL_Surface *screen;
	Uint32 videoflags;
	int    done;
	SDL_Event event;
	int width, height, bpp;

	/* Initialize SDL */
	if ( SDL_Init(SDL_INIT_VIDEO) < 0 ) {
		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
		exit(1);
	}

	/* See if we try to get a hardware colormap */
	width = 640;
	height = 480;
	bpp = 8;
	videoflags = SDL_SWSURFACE;
	while ( argc > 1 ) {
		--argc;
		if ( argv[argc-1] && (strcmp(argv[argc-1], "-width") == 0) ) {
			width = atoi(argv[argc]);
			--argc;
		} else
		if ( argv[argc-1] && (strcmp(argv[argc-1], "-height") == 0) ) {
			height = atoi(argv[argc]);
			--argc;
		} else
		if ( argv[argc-1] && (strcmp(argv[argc-1], "-bpp") == 0) ) {
			bpp = atoi(argv[argc]);
			--argc;
		} else
		if ( argv[argc] && (strcmp(argv[argc], "-hw") == 0) ) {
			videoflags |= SDL_HWSURFACE;
		} else
		if ( argv[argc] && (strcmp(argv[argc], "-hwpalette") == 0) ) {
			videoflags |= SDL_HWPALETTE;
		} else
		if ( argv[argc] && (strcmp(argv[argc], "-flip") == 0) ) {
			videoflags |= SDL_DOUBLEBUF;
		} else
		if ( argv[argc] && (strcmp(argv[argc], "-noframe") == 0) ) {
			videoflags |= SDL_NOFRAME;
		} else
		if ( argv[argc] && (strcmp(argv[argc], "-resize") == 0) ) {
			videoflags |= SDL_RESIZABLE;
		} else
		if ( argv[argc] && (strcmp(argv[argc], "-fullscreen") == 0) ) {
			videoflags |= SDL_FULLSCREEN;
		} else {
			fprintf(stderr, "Usage: %s [-width] [-height] [-bpp] [-hw] [-hwpalette] [-flip] [-noframe] [-fullscreen] [-resize]\n",
								argv[0]);
			exit(1);
		}
	}

	/* Set a video mode */
	screen = CreateScreen(width, height, bpp, videoflags);
	if ( screen == NULL ) {
		exit(2);
	}
        
        DrawBackground(screen);
		
	/* Wait for a keystroke */
	done = 0;
	while ( !done && SDL_WaitEvent(&event) ) {
		switch (event.type) {
			case SDL_MOUSEBUTTONDOWN:
				DrawBox(screen, event.button.x, event.button.y, width, height);
				break;
			case SDL_KEYDOWN:
				/* Ignore ALT-TAB for windows */
				if ( (event.key.keysym.sym == SDLK_LALT) ||
				     (event.key.keysym.sym == SDLK_TAB) ) {
					break;
				}
				/* Center the mouse on <SPACE> */
				if ( event.key.keysym.sym == SDLK_SPACE ) {
					SDL_WarpMouse(width/2, height/2);
					break;
				}
				/* Toggle fullscreen mode on <RETURN> */
				if ( event.key.keysym.sym == SDLK_RETURN ) {
					videoflags ^= SDL_FULLSCREEN;
					screen = CreateScreen(
						screen->w, screen->h,
						screen->format->BitsPerPixel,
								videoflags);
					if ( screen == NULL ) {
						fprintf(stderr,
					"Couldn't toggle fullscreen mode\n");
						done = 1;
					}
                                        DrawBackground(screen);
					break;
				}
				/* Any other key quits the application... */
			case SDL_QUIT:
				done = 1;
				break;
			case SDL_VIDEOEXPOSE:
				DrawBackground(screen);
				break;
			case SDL_VIDEORESIZE:
					screen = CreateScreen(
						event.resize.w, event.resize.h,
						screen->format->BitsPerPixel,
								videoflags);
					if ( screen == NULL ) {
						fprintf(stderr,
					"Couldn't resize video mode\n");
						done = 1;
					}
					DrawBackground(screen);
				break;
			default:
				break;
		}
	}
	SDL_Quit();
	return(0);
}