From aad127ce5b932106bc2ddde0309688a0613f1587 Mon Sep 17 00:00:00 2001
From: Rusty Russell <rusty@rustcorp.com.au>
Date: Thu, 24 Jan 2008 23:54:19 +1100
Subject: [PATCH] Proper redraw and scoring.

---
 Makefile             |   4 +-
 images/0.png         | Bin 0 -> 2039 bytes
 images/1.png         | Bin 0 -> 559 bytes
 images/2.png         | Bin 0 -> 1505 bytes
 images/3.png         | Bin 0 -> 1823 bytes
 images/4.png         | Bin 0 -> 1070 bytes
 images/5.png         | Bin 0 -> 1418 bytes
 images/6.png         | Bin 0 -> 2189 bytes
 images/7.png         | Bin 0 -> 1224 bytes
 images/left-won.png  | Bin 0 -> 6416 bytes
 images/right-won.png | Bin 0 -> 7820 bytes
 prpong.c             | 416 ++++++++++++++++++++++++++++++++++---------
 12 files changed, 334 insertions(+), 86 deletions(-)
 create mode 100644 images/0.png
 create mode 100644 images/1.png
 create mode 100644 images/2.png
 create mode 100644 images/3.png
 create mode 100644 images/4.png
 create mode 100644 images/5.png
 create mode 100644 images/6.png
 create mode 100644 images/7.png
 create mode 100644 images/left-won.png
 create mode 100644 images/right-won.png

diff --git a/Makefile b/Makefile
index 11d33b3..f3e0240 100644
--- a/Makefile
+++ b/Makefile
@@ -1,7 +1,7 @@
 #! /usr/bin/make
 
 CFLAGS:=-Wall -Wmissing-prototypes -Wmissing-declarations -g -I../ccan #-g #-O2 -g
-LDFLAGS:=-lSDL -lcwiid
-prpong: prpong.c stdrusty.h
+LDFLAGS:=-lSDL -lSDL_image -lcwiid 
+prpong: prpong.c stdrusty.h ../ccan/talloc/talloc.o
 
 wiimote: wiimote.c stdrusty.h
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diff --git a/prpong.c b/prpong.c
index 7799f63..ddf4afb 100644
--- a/prpong.c
+++ b/prpong.c
@@ -9,14 +9,24 @@
 #include <limits.h>
 #include "stdrusty.h"
 #include "list/list.h"
+#include "talloc/talloc.h"
+#include "container_of/container_of.h"
 #include <SDL/SDL.h>
+#include <SDL/SDL_image.h>
 #include <cwiid.h>
 #include <assert.h>
 #include <unistd.h>
 
+#define EXPIRY_SECS 3
+
 #define MAX_X CWIID_IR_X_MAX
 #define MAX_Y CWIID_IR_Y_MAX
 
+#define LEFT_PLAYER 1
+#define RIGHT_PLAYER 2
+
+static LIST_HEAD(objects);
+
 struct coord
 {
 	double x;
@@ -475,18 +485,48 @@ static void line(SDL_Surface *s,
   }
 }
 
+/* Bounding box to be updated. */
+static bool needs_update;
+static struct coord start_update, end_update;
+
+struct object
+{
+	/* List of all objects. */
+	struct list_node list;
+	/* Bounding box. */
+	struct coord start, end;
+
+	void (*redraw)(SDL_Surface *s, struct object *me);
+};
+
 struct ball
 {
+	struct object object;
+
 	struct coord pos;
 	struct coord move;
+	SDL_Surface *image;
 };
 
 struct line_segment
 {
+	struct object object;
+
 	struct coord start, end;
 	struct list_node list;
 	bool ignore;
 	struct timeval expires;
+	/* Does someone score if they hit this line ? */
+	struct score *score;
+};
+
+struct score
+{
+	struct object object;
+
+	SDL_Surface *image;
+	unsigned int value;
+	SDL_Surface *won;
 };
 
 static void thick_line(SDL_Surface *s, const struct line_segment *l,
@@ -599,10 +639,10 @@ static void bounce(struct ball *ball, const struct line_segment *line,
 }
 
 static struct line_segment border[] = {
-	{ { 0, 0, }, { MAX_X-1, 0 } },
-	{ { MAX_X-1, 0, }, { MAX_X-1, MAX_Y-1 } },
-	{ { MAX_X-1, MAX_Y-1, }, { 0, MAX_Y-1 } },
-	{ { 0, MAX_Y-1, }, { 0, 0 } },
+	{ .start = { 0, 0, }, .end = { MAX_X-1, 0 } },
+	{ .start = { MAX_X-1, 0, }, .end = { MAX_X-1, MAX_Y-1 } },
+	{ .start = { MAX_X-1, MAX_Y-1, }, .end = { 0, MAX_Y-1 } },
+	{ .start = { 0, MAX_Y-1, }, .end = { 0, 0 } },
 };
 
 static inline float deg_to_rad(float degrees)
@@ -749,31 +789,218 @@ static bool map_coord(unsigned int x, unsigned int y,
 	return true;
 }
 
-static struct line_segment *new_line(unsigned int startx, unsigned int starty,
-				     unsigned int endx, unsigned int endy,
-				     const struct coord calib[])
+static void add_update(const struct object *obj)
 {
-	struct line_segment *l = malloc(sizeof(*l));
+	if (!needs_update) {
+		start_update = obj->start;
+		end_update = obj->end;
+		needs_update = true;
+		return;
+	}
+	if (obj->start.x < start_update.x)
+		start_update.x = obj->start.x;
+	if (obj->start.y < start_update.y)
+		start_update.y = obj->start.y;
+	if (obj->end.x > end_update.x)
+		end_update.x = obj->end.x;
+	if (obj->end.y > end_update.y)
+		end_update.y = obj->end.y;
+}
+
+static void destroy_object(struct object *object)
+{
+	list_del(&object->list);
+	add_update(object);
+}
+
+static void add_object(struct list_head *list,
+		       struct object *obj,
+		       unsigned int startx, unsigned int starty,
+		       unsigned int width, unsigned int height,
+		       void (*redraw)(SDL_Surface *s, struct object *me))
+{
+	list_add_tail(list, &obj->list);
+	obj->start.x = startx;
+	obj->start.y = starty;
+	obj->end.x = startx + width;
+	obj->end.y = starty + height;
+	obj->redraw = redraw;
+	add_update(obj);
+}
+
+static void redraw_line(SDL_Surface *s, struct object *me)
+{
+	struct line_segment *l = container_of(me, struct line_segment, object);
+
+	thick_line(s, l, 0);
+}
+
+static int destroy_line(struct line_segment *l)
+{
+	list_del(&l->list);
+	destroy_object(&l->object);
+	return 0;
+}
+
+static void line_object_setup(struct list_head *lines,
+			      struct list_head *objects,
+			      struct line_segment *l)
+{
+	unsigned int tmp, startx, endx, starty, endy;
+
+	list_add_tail(lines, &l->list);
+
+	startx = l->start.x;
+	starty = l->start.y;
+	endx = l->end.x;
+	endy = l->end.y;
+
+	/* Find bounding box */
+	if (startx > endx) {
+		tmp = endx;
+		endx = startx;
+		startx = tmp;
+	}
+	if (starty > endy) {
+		tmp = endy;
+		endy = starty;
+		starty = tmp;
+	}
+	/* Padding for thick lines (beware underflow) */
+	if (startx > 0)
+		startx--;
+	if (starty > 0)
+		starty--;
+	endx++;
+	endy++;
+
+	add_object(objects, &l->object, startx, starty,
+		   endx - startx, endy - starty, redraw_line);
+}
+
+static void add_line(struct list_head *lines,
+		     unsigned int startx, unsigned int starty,
+		     unsigned int endx, unsigned int endy,
+		     const struct coord calib[])
+{
+	struct line_segment *l = talloc(NULL, struct line_segment);
+	struct timeval now;
 
-	l->ignore = false;
 	if (!map_coord(startx, starty, calib, &l->start)
 	    || !map_coord(endx, endy, calib, &l->end)) {
-		free(l);
-		return NULL;
+		talloc_free(l);
+		return;
 	}
-	return l;
+
+	l->ignore = false;
+	l->score = NULL;
+	gettimeofday(&now, NULL);
+	l->expires = now;
+	l->expires.tv_sec += EXPIRY_SECS;
+
+	line_object_setup(lines, &objects, l);
+	talloc_set_destructor(l, destroy_line);
+}
+
+static void redraw_ball(SDL_Surface *s, struct object *me)
+{
+	struct ball *b = container_of(me, struct ball, object);
+	SDL_Rect rect = { .x = b->pos.x - b->image->w/2,
+			  .y = b->pos.y - b->image->h/2 };
+
+	SDL_BlitSurface(b->image, NULL, s, &rect);
+}
+
+static void redraw_score(SDL_Surface *s, struct object *me)
+{
+	struct score *score = container_of(me, struct score, object);
+	SDL_Rect rect = { .x = score->object.start.x,
+			  .y = score->object.start.y };
+
+	SDL_BlitSurface(score->image, NULL, s, &rect);
+}
+
+static SDL_Surface *score(struct score *s)
+{
+	char filename[40];
+
+	s->value++;
+	SDL_FreeSurface(s->image);
+	sprintf(filename, "images/%u.png", s->value);
+	s->image = IMG_Load(filename);
+	/* No more images?  You won! */
+	if (!s->image)
+		return s->won;
+
+	add_update(&s->object);
+	return NULL;
+}
+
+/* Due to rounding, we exaggerate bounding box by 1 here. */
+static void do_updates(struct list_head *objects, SDL_Surface *screen)
+{
+	struct object *i;
+	unsigned int y, startx, starty, endx, endy;
+
+	/* Clip */
+	if (start_update.x <= 0)
+		startx = 0;
+	else
+		startx = start_update.x - 1;
+	if (start_update.y <= 0)
+		starty = 0;
+	else
+		starty = start_update.y - 1;
+
+	endx = end_update.x+1;
+	endy = end_update.y+1;
+
+	if (endx > screen->w)
+		endx = screen->w;
+	if (endy > screen->h)
+		endy = screen->h;
+
+	SDL_LockSurface(screen);
+	/* First we clear the area to white. */
+	for (y = starty; y < endy; y++) {
+		memset(screen->pixels + y * screen->pitch
+		       + screen->format->BytesPerPixel * startx,
+		       0xFF,
+		       (endx - startx) * screen->format->BytesPerPixel);
+	}
+	SDL_UnlockSurface(screen);
+
+	/* Now redraw everything which overlaps it */
+	list_for_each(objects, i, list) {
+		if (i->end.x < startx)
+			continue;
+		if (i->end.y < starty)
+			continue;
+		if (i->start.x > endx)
+			continue;
+		if (i->start.y > endy)
+			continue;
+		i->redraw(screen, i);
+	}
+
+	SDL_UpdateRect(screen, startx, starty, endx - startx, endy - starty);
+
+	/* Reset bounding box */
+	needs_update = false;
 }
 
+static bool same_side(const struct ball *ball, unsigned int x)
+{
+	return (ball->pos.x >= MAX_X/2) == (x >= MAX_X/2);
+}
 
 int main(int argc, char *argv[])
 {
 	struct ball ball;
-	SDL_Surface *screen, *ballsur, *savesur = NULL;
+	SDL_Surface *screen;
 	Uint8  video_bpp;
 	Uint32 videoflags;
 	unsigned int i, time_since_last_ir = INT_MAX;
-	SDL_Rect rect;
-	struct timeval line_life = { 3, 0 };
 	cwiid_wiimote_t *wiimote;
 	struct cwiid_state state;
 	struct coord calib[4];
@@ -781,7 +1008,7 @@ int main(int argc, char *argv[])
 	bool mouse = false, needs_calibration = true, drawing = false;
 	LIST_HEAD(lines);
 	struct cwiid_ir_src *ir, last_ir = { .valid = 0 };
-	struct line_segment *n;
+	struct score left, right;
 
 	videoflags = SDL_SWSURFACE;
 
@@ -817,17 +1044,10 @@ int main(int argc, char *argv[])
 		argv++;
 	}
 
-	if (argc != 5)
-		errx(1, "Usage: %s [--fullscreen] [--calib=x,y,x,y,x,y,x,y] [--mouse] ballx bally ballangle ballspeed\n"
-		     "   Where ballangle is 0 for north, 90 for east, etc\n",
+	if (argc != 2)
+		errx(1, "Usage: %s [--fullscreen] [--calib=x,y,x,y,x,y,x,y] [--mouse] speed\n",
 			argv[0]);
 
-	ball.pos.x = atol(argv[1]);
-	ball.pos.y = atol(argv[2]);
-	ball.move.x = sin(deg_to_rad(atof(argv[3]))) * atol(argv[4]);
-	ball.move.y = cos(deg_to_rad(atof(argv[3]))) * atol(argv[4]);
-	printf("ball move = %f,%f\n", ball.move.x, ball.move.y);
-
 	/* Initialize SDL */
 	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
 		fprintf(stderr, "Couldn't initialize SDL: %s\n",SDL_GetError());
@@ -846,13 +1066,13 @@ int main(int argc, char *argv[])
 			errx(1, "Can't set IR repeat mode");
 	}
 
-	if ( (screen=SDL_SetVideoMode(MAX_X,MAX_Y,video_bpp,videoflags)) == NULL ) {
+	if ((screen=SDL_SetVideoMode(MAX_X,MAX_Y,video_bpp,videoflags)) == NULL) {
 		errx(1, "Couldn't set %dx%dx%d video mode: %s",
 		     MAX_X, MAX_Y,video_bpp, SDL_GetError());
 	}
 
 	/* Set the surface pixels and refresh! */
-	if ( SDL_LockSurface(screen) < 0 ) {
+	if (SDL_LockSurface(screen) < 0) {
 		errx(1, "Couldn't lock the display surface: %s",
 		     SDL_GetError());
 	}
@@ -870,16 +1090,44 @@ int main(int argc, char *argv[])
 		calibrate(screen, wiimote, &calib[3], 0, MAX_Y - 1);
 	}
 
-	/* Draw borders, put them in list. */
+	/* Create borders, put them in list. */
 	for (i = 0; i < ARRAY_SIZE(border); i++) {
 		border[i].ignore = false;
 		border[i].expires.tv_sec = LONG_MAX;
 		border[i].expires.tv_usec = 0;
-		list_add(&lines, &border[i].list);
-		thick_line(screen, &border[i], 0);
+		line_object_setup(&lines, &objects, &border[i]);
 	}
 
-	ballsur = ball_surface(screen);
+	/* Set up scores. */
+	left.value = right.value = 0;
+	left.image = IMG_Load("images/0.png");
+	left.won = IMG_Load("images/left-won.png");
+	right.image = IMG_Load("images/0.png");
+	right.won = IMG_Load("images/right-won.png");
+	if (!left.image || !right.image || !left.won || !right.won)
+		err(1, "Opening score images");
+
+	add_object(&objects, &left.object,
+		   MAX_X/6 - left.image->w/2, 10,
+		   left.image->w, left.image->h, redraw_score);
+	add_object(&objects, &right.object,
+		   MAX_X - MAX_X/6 - left.image->w/2, 10,
+		   left.image->w, left.image->h, redraw_score);
+
+	/* Hit right border = score to left, and vice versa. */
+	border[1].score = &left;
+	border[3].score = &right;
+
+	srandom(time(NULL));
+	ball.pos.x = MAX_X/2;
+	ball.pos.y = MAX_Y/2;
+	ball.move.x = (random() % 2 ? -1 : 1) * atoi(argv[1]);
+	ball.move.y = 0;
+	ball.image = ball_surface(screen);
+	add_object(&objects, &ball.object,
+		   ball.pos.x - ball.image->w/2,
+		   ball.pos.y - ball.image->h/2,
+		   ball.image->w, ball.image->h, redraw_ball);
 
 	for (;;) {
 		struct coord new, isect, move = ball.move;
@@ -893,13 +1141,8 @@ int main(int argc, char *argv[])
 
 		/* Expire lines */
 		list_for_each_safe(&lines, l, next, list) {
-			if (timercmp(&l->expires, &now, <)) {
-				printf("Deleting line %p\n", l);
-				list_del(&l->list);
-				/* FIXME: Undraw properly. */
-				thick_line(screen, l, 0xFFFFFFFF);
-				free(l);
-			}
+			if (timercmp(&l->expires, &now, <))
+				talloc_free(l);
 		}
 
 	again:
@@ -934,6 +1177,24 @@ int main(int argc, char *argv[])
 			/* Don't hit the same line twice. */
 			printf("Ignoring that line\n");
 			best_l->ignore = ignored = true;
+			if (best_l->score) {
+				SDL_Surface *won = score(best_l->score);
+				if (won) {
+					SDL_Rect rect;
+
+					rect.x = MAX_X/2 - won->w/2;
+					rect.y = MAX_Y/2 - won->h/2;
+					rect.w = won->w;
+					rect.h = won->h;
+					SDL_BlitSurface(won, NULL, screen,
+							&rect);
+					SDL_UpdateRect(screen,
+						       rect.x, rect.y,
+						       rect.w, rect.h);
+					SDL_Delay(3000);
+					exit(0);
+				}
+			}
 			goto again;
 		}
 
@@ -943,28 +1204,22 @@ int main(int argc, char *argv[])
 			       move.x, move.y, new.x, new.y);
 		}
 
-		/* Restore what was there before ball. */
-		if (savesur) {
-			SDL_BlitSurface(savesur, NULL, screen, &rect);
-			SDL_UpdateRect(screen, rect.x, rect.y, rect.w, rect.h);
-		} else {
-			savesur = sub_surface(screen, ballsur->w, ballsur->h);
-		}
+		/* We also need to redraw under old ball. */
+		add_update(&ball.object);
 
-		/* Save away image under new ball. */
-		rect.w = ballsur->w;
-		rect.h = ballsur->h;
-		rect.x = new.x - ballsur->w/2;
-		rect.y = new.y - ballsur->h/2;
-		SDL_BlitSurface(screen, &rect, savesur, NULL);
-
-		/* Draw new ball */
-		SDL_BlitSurface(ballsur, NULL, screen, &rect);
-		SDL_UpdateRect(screen, rect.x, rect.y, rect.w, rect.h);
-		/* That SDL_BlitSurface can crop rect. */
-		rect.x = new.x - ballsur->w/2;
-		rect.y = new.y - ballsur->h/2;
+		/* Move ball. */
 		ball.pos = new;
+		ball.object.start.x = ball.pos.x - ball.image->w/2;
+		ball.object.start.y = ball.pos.y - ball.image->h/2;
+		ball.object.end.x = ball.pos.x + ball.image->w/2;
+		ball.object.end.y = ball.pos.y + ball.image->h/2;
+
+		/* Need to draw under new ball. */
+		add_update(&ball.object);
+
+		/* Clears, redraws and resets the updates */
+		do_updates(&objects, screen);
+
 		SDL_Delay(25);
 
 		while (SDL_PollEvent(&event)) {
@@ -983,23 +1238,17 @@ int main(int argc, char *argv[])
 					drawing = false;
 					break;
 				case SDL_MOUSEMOTION:
-					if (!drawing)
+					if (!drawing ||
+					    !same_side(&ball, event.motion.x))
 						break;
 
-					n = new_line(event.motion.x,
-						     event.motion.y,
-						     event.motion.x
-						     + event.motion.xrel,
-						     event.motion.y
-						     + event.motion.yrel,
-						     calib);
-
-					if (n) {
-						timeradd(&now, &line_life,
-							 &n->expires);
-						list_add_tail(&lines, &n->list);
-						thick_line(screen, n, 0);
-					}
+					add_line(&lines, event.motion.x,
+						 event.motion.y,
+						 event.motion.x
+						 + event.motion.xrel,
+						 event.motion.y
+						 + event.motion.yrel,
+						 calib);
 				}
 			}
 		}
@@ -1015,23 +1264,22 @@ int main(int argc, char *argv[])
 		for (i = 0; i < CWIID_IR_SRC_COUNT; i++) {
 			if (!state.ir_src[i].valid)
 				continue;
+			/* Only look at dots on same side as ball */
+			if (!same_side(&ball, state.ir_src[i].pos[0]))
+				continue;
 			if (!ir->valid || state.ir_src[i].size > ir->size)
 				ir = &state.ir_src[0];
 		}
 
 		if (ir->valid) {
 			/* Give it some slack for missing one or two... */
-			if (time_since_last_ir <= 5) {
-				n = new_line(last_ir.pos[0],
-					     last_ir.pos[1],
-					     ir->pos[0],
-					     ir->pos[1],
-					     calib);
-				if (n) {
-					timeradd(&now, &line_life, &n->expires);
-					list_add_tail(&lines, &n->list);
-					thick_line(screen, n, 0);
-				}
+			if (time_since_last_ir <= 5
+			    && same_side(&ball, last_ir.pos[0])) {
+				add_line(&lines, last_ir.pos[0],
+					 last_ir.pos[1],
+					 ir->pos[0],
+					 ir->pos[1],
+					 calib);
 			}
 			time_since_last_ir = 0;
 			last_ir = *ir;
-- 
2.39.2