Added Ballfield demo to test HW-accelerated alpha

project/jni/application/ballfield/AndroidAppSettings.cfg

@@ -0,0 +1,30 @@
+# The application settings for Android libSDL port
+AppSettingVersion=12
+LibSdlVersion=1.2
+AppName="Ballfield"
+AppFullName=net.olofson.ballfield
+ScreenOrientation=h
+InhibitSuspend=n
+AppDataDownloadUrl="Game data is 1 Mb|ballfield.zip"
+SdlVideoResize=y
+SdlVideoResizeKeepAspect=n
+NeedDepthBuffer=n
+AppUsesMouse=n
+AppNeedsArrowKeys=n
+AppUsesJoystick=n
+AppHandlesJoystickSensitivity=n
+AppUsesMultitouch=n
+NonBlockingSwapBuffers=n
+RedefinedKeys="SPACE RETURN"
+AppTouchscreenKeyboardKeysAmount=1
+AppTouchscreenKeyboardKeysAmountAutoFire=0
+MultiABI=n
+AppVersionCode=101
+AppVersionName="1.01"
+CompiledLibraries="sdl_mixer sdl_image"
+CustomBuildScript=n
+AppCflags='-O2 -finline-functions'
+AppLdflags=''
+AppSubdirsBuild=''
+AppUseCrystaXToolchain=n
+ReadmeText='^'

project/jni/application/ballfield/ballfield.c

@@ -0,0 +1,515 @@
+/*
+ * "Ballfield"
+ *
+ *   (C) David Olofson <david@olofson.net>, 2002, 2003
+ *
+ * This software is released under the terms of the GPL.
+ *
+ * Contact author for permission if you want to use this
+ * software, or work derived from it, under other terms.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+
+#include "SDL.h"
+#include "SDL_image.h"
+
+#include "ballfield.h"
+
+
+/*----------------------------------------------------------
+	General tool functions
+----------------------------------------------------------*/
+
+/*
+ * Bump areas of low and high alpha to 0% or 100%
+ * respectively, just in case the graphics contains
+ * "alpha noise".
+ */
+SDL_Surface *clean_alpha(SDL_Surface *s)
+{
+	SDL_Surface *work;
+	SDL_Rect r;
+	Uint32 *pixels;
+	int pp;
+	int x, y;
+	
+	work = SDL_CreateRGBSurface(SDL_SWSURFACE, s->w, s->h,
+			32, 0xff000000, 0x00ff0000, 0x0000ff00,
+			0x000000ff);
+	if(!work)
+		return NULL;
+
+	r.x = r.y = 0;
+	r.w = s->w;
+	r.h = s->h;
+	if(SDL_BlitSurface(s, &r, work, NULL) < 0)
+	{
+		SDL_FreeSurface(work);
+		return NULL;
+	}
+
+	SDL_LockSurface(work);
+	pixels = work->pixels;
+	pp = work->pitch / sizeof(Uint32);
+	for(y = 0; y < work->h; ++y)
+		for(x = 0; x < work->w; ++x)
+		{
+			Uint32 pix = pixels[y*pp + x];
+			switch((pix & 0xff) >> 4)
+			{
+			  case 0:
+				pix = 0x00000000;
+			  	break;
+			  default:
+			  	break;
+			  case 15:
+				pix |= 0xff;
+			  	break;
+			}
+			pixels[y*pp + x] = pix;
+		}
+	SDL_UnlockSurface(work);
+
+	return work;
+}
+
+
+/*
+ * Load and convert an antialiazed, zoomed set of sprites.
+ */
+SDL_Surface *load_zoomed(char *name, int alpha)
+{
+	SDL_Surface *sprites;
+	SDL_Surface *temp = IMG_Load(name);
+	if(!temp)
+		return NULL;
+
+	/*
+	sprites = temp;
+	SDL_SetAlpha(sprites, 0, 255);
+	temp = clean_alpha(sprites);
+	SDL_FreeSurface(sprites);
+	*/
+	if(!temp)
+	{
+		fprintf(stderr, "Could not clean alpha!\n");
+		return NULL;
+	}
+
+	if(alpha)
+	{
+		SDL_SetAlpha(temp, 0, SDL_ALPHA_OPAQUE);
+		sprites = SDL_DisplayFormatAlpha(temp);
+	}
+	else
+	{
+		SDL_SetColorKey(temp, SDL_SRCCOLORKEY,
+				SDL_MapRGB(temp->format, 0, 0, 0));
+		sprites = SDL_DisplayFormat(temp);
+	}
+	SDL_FreeSurface(temp);
+
+	return sprites;
+}
+
+
+void print_num(SDL_Surface *dst, SDL_Surface *font, int x, int y, float value)
+{
+	char buf[16];
+	int val = (int)(value * 10.0);
+	int pos, p = 0;
+	SDL_Rect from;
+
+	/* Sign */
+	if(val < 0)
+	{
+		buf[p++] = 10;
+		val = -val;
+	}
+
+	/* Integer part */
+	pos = 10000000;
+	while(pos > 1)
+	{
+		int num = val / pos;
+		val -= num * pos;
+		pos /= 10;
+		if(p || num)
+			buf[p++] = num;
+	}
+
+	/* Decimals */
+	if(val / pos)
+	{
+		buf[p++] = 11;
+		while(pos > 0)
+		{
+			int num = val / pos;
+			val -= num * pos;
+			pos /= 10;
+			buf[p++] = num;
+		}
+	}
+
+	/* Render! */
+	from.y = 0;
+	from.w = 7;
+	from.h = 10;
+	for(pos = 0; pos < p; ++pos)
+	{
+		SDL_Rect to;
+		to.x = x + pos * 7;
+		to.y = y;
+		from.x = buf[pos] * 7;
+		SDL_BlitSurface(font, &from, dst, &to);
+	}
+}
+
+
+
+/*----------------------------------------------------------
+	ballfield_t functions
+----------------------------------------------------------*/
+
+ballfield_t *ballfield_init(void)
+{
+	int i;
+	ballfield_t *bf = calloc(sizeof(ballfield_t), 1);
+	if(!bf)
+		return NULL;
+	for(i = 0; i < BALLS; ++i)
+	{
+		bf->points[i].x = rand() % 0x20000;
+		bf->points[i].y = rand() % 0x20000;
+		bf->points[i].z = 0x20000 * i / BALLS;
+		if(rand() % 100 > 80)
+			bf->points[i].c = 1;
+		else
+			bf->points[i].c = 0;
+	}
+	return bf;
+}
+
+
+void ballfield_free(ballfield_t *bf)
+{
+	int i;
+	for(i = 0; i < COLORS; ++i)
+		SDL_FreeSurface(bf->gfx[i]);
+}
+
+
+static int ballfield_init_frames(ballfield_t *bf)
+{
+	int i, j;
+	/*
+	 * Set up source rects for all frames
+	 */
+	bf->frames = calloc(sizeof(SDL_Rect), bf->gfx[0]->w);
+	if(!bf->frames)
+	{
+		fprintf(stderr, "No memory for frame rects!\n");
+		return -1;
+	}
+	for(j = 0, i = 0; i < bf->gfx[0]->w; ++i)
+	{
+		bf->frames[i].x = 0;
+		bf->frames[i].y = j;
+		bf->frames[i].w = bf->gfx[0]->w - i;
+		bf->frames[i].h = bf->gfx[0]->w - i;
+		j += bf->gfx[0]->w - i;
+	}
+	return 0;
+}
+
+
+int ballfield_load_gfx(ballfield_t *bf, char *name, unsigned int color)
+{
+	if(color >= COLORS)
+		return -1;
+
+	bf->gfx[color] = load_zoomed(name, bf->use_alpha);
+	if(!bf->gfx[color])
+		return -2;
+
+	if(!bf->frames)
+		return ballfield_init_frames(bf);
+
+	return 0;
+}
+
+
+void ballfield_move(ballfield_t *bf, Sint32 dx, Sint32 dy, Sint32 dz)
+{
+	int i;
+	for(i = 0; i < BALLS; ++i)
+	{
+		bf->points[i].x += dx;
+		bf->points[i].x &= 0x1ffff;
+		bf->points[i].y += dy;
+		bf->points[i].y &= 0x1ffff;
+		bf->points[i].z += dz;
+		bf->points[i].z &= 0x1ffff;
+	}
+}
+
+
+void ballfield_render(ballfield_t *bf, SDL_Surface *screen)
+{
+	int i, j, z;
+
+	/* 
+	 * Find the ball with the highest Z.
+	 */
+	z = 0;
+	j = 0;
+	for(i = 0; i < BALLS; ++i)
+	{
+		if(bf->points[i].z > z)
+		{
+			j = i;
+			z = bf->points[i].z;
+		}
+	}
+
+	/* 
+	 * Render all balls in back->front order.
+	 */
+	for(i = 0; i < BALLS; ++i)
+	{
+		SDL_Rect r;
+		int f;
+		z = bf->points[j].z;
+		z += 50;
+		f = ((bf->frames[0].w << 12) + 100000) / z;
+		f = bf->frames[0].w - f;
+		if(f < 0)
+			f = 0;
+		else if(f > bf->frames[0].w - 1)
+			f = bf->frames[0].w - 1;
+		z >>= 7;
+		z += 1;
+		r.x = (bf->points[j].x - 0x10000) / z;
+		r.y = (bf->points[j].y - 0x10000) / z;
+		r.x += (screen->w - bf->frames[f].w) >> 1;
+		r.y += (screen->h - bf->frames[f].h) >> 1;
+		SDL_BlitSurface(bf->gfx[bf->points[j].c],
+			&bf->frames[f], screen, &r);
+		if(--j < 0)
+			j = BALLS - 1;
+	}
+}
+
+
+
+/*----------------------------------------------------------
+	Other rendering functions
+----------------------------------------------------------*/
+
+/*
+ * Draw tiled background image with offset.
+ */
+void tiled_back(SDL_Surface *back, SDL_Surface *screen, int xo, int yo)
+{
+	int x, y;
+	SDL_Rect r;
+	if(xo < 0)
+		xo += back->w*(-xo/back->w + 1);
+	if(yo < 0)
+		yo += back->h*(-yo/back->h + 1);
+	xo %= back->w;
+	yo %= back->h;
+	for(y = -yo; y < screen->h; y += back->h)
+		for(x = -xo; x < screen->w; x += back->w)
+		{
+			r.x = x;
+			r.y = y;
+			SDL_BlitSurface(back, NULL, screen, &r);
+		}
+}
+
+
+
+/*----------------------------------------------------------
+	main()
+----------------------------------------------------------*/
+
+int main(int argc, char* argv[])
+{
+	ballfield_t	*balls;
+	SDL_Surface	*screen;
+	SDL_Surface	*temp_image;
+	SDL_Surface	*back, *logo, *font;
+	SDL_Event	event;
+	int		bpp = 16,
+			flags = SDL_DOUBLEBUF | SDL_HWSURFACE,
+			alpha = 1;
+	int		x_offs = 0, y_offs = 0;
+	long		tick,
+			last_tick,
+			last_avg_tick;
+	double		t = 0;
+	float		dt;
+	int		i;
+	float		fps = 0.0;
+	int		fps_count = 0;
+	int		fps_start = 0;
+	float		x_speed, y_speed, z_speed;
+
+	SDL_Init(SDL_INIT_VIDEO);
+
+	atexit(SDL_Quit);
+
+	for(i = 1; i < argc; ++i)
+	{
+		if(strncmp(argv[i], "-na", 3) == 0)
+			alpha = 0;
+		else if(strncmp(argv[i], "-nd", 3) == 0)
+			flags &= ~SDL_DOUBLEBUF;
+		else if(strncmp(argv[i], "-h", 2) == 0)
+		{
+			flags |= SDL_HWSURFACE;
+			flags &= ~SDL_SWSURFACE;
+		}
+		else if(strncmp(argv[i], "-f", 2) == 0)
+			flags |= SDL_FULLSCREEN;
+		else
+			bpp = atoi(&argv[i][1]);
+	}
+
+	screen = SDL_SetVideoMode(SCREEN_W, SCREEN_H, bpp, flags);
+	if(!screen)
+	{
+		fprintf(stderr, "Failed to open screen!\n");
+		exit(-1);
+	}
+
+	SDL_WM_SetCaption("Ballfield", "Ballfield");
+	if(flags & SDL_FULLSCREEN)
+		SDL_ShowCursor(0);
+
+	balls = ballfield_init();
+	if(!balls)
+	{
+		fprintf(stderr, "Failed to create ballfield!\n");
+		exit(-1);
+	}
+
+	/*
+	 * Load and prepare balls...
+	 */
+	balls->use_alpha = alpha;
+	if( ballfield_load_gfx(balls, "blueball.png", 0)
+				||
+			ballfield_load_gfx(balls, "redball.png", 1) )
+	{
+		fprintf(stderr, "Could not load balls!\n");
+		exit(-1);
+	}
+
+	/*
+	 * Load background image
+	 */
+	temp_image = IMG_Load("redbluestars.png");
+	if(!temp_image)
+	{
+		fprintf(stderr, "Could not load background!\n");
+		exit(-1);
+	}
+	back = SDL_DisplayFormat(temp_image);
+	SDL_FreeSurface(temp_image);
+
+	/*
+	 * Load logo
+	 */
+	temp_image = SDL_LoadBMP("logo.bmp");
+	if(!temp_image)
+	{
+		fprintf(stderr, "Could not load logo!\n");
+		exit(-1);
+	}
+	SDL_SetColorKey(temp_image, SDL_SRCCOLORKEY|SDL_RLEACCEL,
+			SDL_MapRGB(temp_image->format, 255, 0, 255));
+	logo = SDL_DisplayFormat(temp_image);
+	SDL_FreeSurface(temp_image);
+
+	/*
+	 * Load font
+	 */
+	temp_image = SDL_LoadBMP("font7x10.bmp");
+	if(!temp_image)
+	{
+		fprintf(stderr, "Could not load font!\n");
+		exit(-1);
+	}
+	SDL_SetColorKey(temp_image, SDL_SRCCOLORKEY|SDL_RLEACCEL,
+			SDL_MapRGB(temp_image->format, 255, 0, 255));
+	font = SDL_DisplayFormat(temp_image);
+	SDL_FreeSurface(temp_image);
+
+	last_avg_tick = last_tick = SDL_GetTicks();
+	while(1)
+	{
+		SDL_Rect r;
+		if(SDL_PollEvent(&event) > 0)
+		{
+			if(event.type == SDL_MOUSEBUTTONDOWN)
+				break;
+
+			if(event.type & (SDL_KEYUP | SDL_KEYDOWN))
+			{
+				Uint8	*keys = SDL_GetKeyState(&i);
+				if(keys[SDLK_ESCAPE])
+					break;
+			}
+		}
+
+		/* Timing */
+		tick = SDL_GetTicks();
+		dt = (tick - last_tick) * 0.001f;
+		last_tick = tick;
+
+		/* Background image */
+		tiled_back(back, screen, x_offs>>11, y_offs>>11);
+
+		/* Ballfield */
+		ballfield_render(balls, screen);
+
+		/* Logo */
+		r.x = 2;
+		r.y = 2;
+		SDL_BlitSurface(logo, NULL, screen, &r);
+
+		/* FPS counter */
+		if(tick > fps_start + 500)
+		{
+			fps = (float)fps_count * 1000.0 / (tick - fps_start);
+			fps_count = 0;
+			fps_start = tick;
+		}
+		print_num(screen, font, screen->w-37, screen->h-12, fps);
+		++fps_count;
+
+		SDL_Flip(screen);
+
+		/* Animate */
+		x_speed = 500.0 * sin(t * 0.37);
+		y_speed = 500.0 * sin(t * 0.53);
+		z_speed = 400.0 * sin(t * 0.21);
+
+		ballfield_move(balls, x_speed, y_speed, z_speed);
+		x_offs -= x_speed;
+		y_offs -= y_speed;
+
+		t += dt;
+	}
+
+	ballfield_free(balls);
+	SDL_FreeSurface(back);
+	SDL_FreeSurface(logo);
+	SDL_FreeSurface(font);
+	exit(0);
+}

project/jni/application/ballfield/ballfield.h

@@ -0,0 +1,61 @@
+/*
+ * "Ballfield"
+ *
+ *   (C) David Olofson <david@olofson.net>, 2002
+ *
+ * This software is released under the terms of the GPL.
+ *
+ * Contact author for permission if you want to use this
+ * software, or work derived from it, under other terms.
+ */
+
+#ifndef	_BALLFIELD_H_
+#define	_BALLFIELD_H_
+
+#include "SDL.h"
+
+/*----------------------------------------------------------
+	Definitions...
+----------------------------------------------------------*/
+
+#define	BALLS	200
+
+#define	COLORS	2
+
+typedef struct
+{
+	Sint32	x, y, z;	/* Position */
+	Uint32	c;		/* Color */
+} point_t;
+
+
+/*
+ * Ballfield
+ */
+typedef struct
+{
+	point_t		points[BALLS];
+	SDL_Rect	*frames;
+	SDL_Surface	*gfx[COLORS];
+	int		use_alpha;
+} ballfield_t;
+
+
+/*
+ * Size of the screen in pixels
+ */
+#define	SCREEN_W	320
+#define	SCREEN_H	240
+
+/*
+ * Size of the biggest ball image in pixels
+ *
+ * Balls are scaled down and *packed*, one pixel
+ * smaller for each frame down to 1x1. The actual
+ * image width is (obviously...) the same as the
+ * width of the first frame.
+ */
+#define	BALL_W	32
+#define	BALL_H	32
+
+#endif	/* _BALLFIELD_H_ */