view test/graywin.c @ 937:1e6366bde299

Date: Tue, 27 Jul 2004 17:14:00 +0200 From: "Eckhard Stolberg" Subject: Controller names in SDL for Windows I'm working on an Atari 2600 emulator for different systems that uses the SDL. Some time ago someone created an adaptor that lets you use your old Atari controllers with your computer through the USB port. Some of the Atari controllers require special handling by the emulator, so it would be nice, if it would be possible to detect if any of the controllers connected to the computer is this adaptor. SDL would allow that with the SDL_JoystickName function, but unfortunately it doesn't work properly on Windows. On Linux and MacOSX this function returns the name of the controller, but on Windows you'll only get the name of the joystick driver. Most joysticks nowadays use the generic Microsoft driver, so they all return the same name. In an old MSDN article (http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/dnarinput/html/msdn_extdirect.asp) Microsoft describes how to read out the OEM controller names from the registry. I have implemented this for the SDL controller handler on Windows, and now reading the joystick name works properly there too.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Aug 2004 03:45:58 +0000
parents 609543e2b3a1
children d33645c36072
line wrap: on
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/* 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], "-fullscreen") == 0) ) {
			videoflags |= SDL_FULLSCREEN;
		} else {
			fprintf(stderr, "Usage: %s [-width] [-height] [-bpp] [-hw] [-hwpalette] [-flip] [-noframe] [-fullscreen]\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;
			default:
				break;
		}
	}
	SDL_Quit();
	return(0);
}