view test/graywin.c @ 4106:12bb6311fd5d SDL-1.2

Hans de Goede fixed bug #495 When running boswars: http://www.boswars.org/ on a machine with intel integrathed graphics it crashes when it tries to play the initial theora splashscreen video: X Error of failed request: BadAlloc (insufficient resources for operation) Major opcode of failed request: 140 (XVideo) Minor opcode of failed request: 19 () Serial number of failed request: 25 Current serial number in output stream: 26 boswars: xcb_xlib.c:41: xcb_xlib_lock: Assertion `!c->xlib.lock' failed. Aborted I recognized this problem from a few years back, when I encountered it while working on the Xv blitter for xmame. The problem is that for some reason creation the Xvport and XvImage succeeds, and failure (lack of resources / hw capability?) is only indicated during the first XvPut[Shm]Image. I've written a patch for SDL using the work around for this I developed for xmame (and which is still used successfully in xmame after many years of usage). I'll admit it isn't very pretty, but after investigating several possibilities this was the best option, any other fixes would need changes to the SDL api and abi.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 29 Dec 2007 02:23:48 +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);
}