From 44d403c7823e58abb4993229b56e81de117e9c1b Mon Sep 17 00:00:00 2001
From: James Bunton <jamesbunton@fastmail.fm>
Date: Sat, 23 Jun 2007 22:00:46 +1000
Subject: [PATCH] Welcome screen

Added welcome screen with instructions
Can select multi/single player game from welcome screen
Winners are announced on the welcome screen
---
 pong.c | 135 ++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 96 insertions(+), 39 deletions(-)

diff --git a/pong.c b/pong.c
index f09d718..09bf9d4 100644
--- a/pong.c
+++ b/pong.c
@@ -20,7 +20,12 @@
 #define PADDLESIZE  10
 #define HEIGHT      100
 
-static int AI = 0;
+#define STATE_UI 0
+#define STATE_1P 1
+#define STATE_2P 2
+
+static char* menu = "";
+static int state  = 0;
 static int p1move = 0;
 static int p2move = 0;
 static int score1 = 0;
@@ -33,7 +38,7 @@ static GLdouble ballVecX = 0.0;
 static GLdouble ballVecY = 0.0;
 
 
-static void initball(void) {
+static void initBall(void) {
 	ballX = 0.0;
 	ballY = 0.0;
 	if(ballVecX < 0)
@@ -44,8 +49,8 @@ static void initball(void) {
 }
 
 static void run(void) {
-	// AI
-	if(AI) {
+	// AI is on
+	if(state == STATE_1P) {
 		if(ballY < paddle2 - PADDLESIZE)
 			p2move = -1;
 		else if(ballY > paddle2 + PADDLESIZE)
@@ -90,11 +95,11 @@ static void run(void) {
 	// Check if it's past the sides of the screen
 	if(ballX >= HEIGHT) {
 		++score1;
-		initball();
+		initBall();
 	}
 	if(ballX <= -HEIGHT) {
 		++score2;
-		initball();
+		initBall();
 	}
 
 	// Move the ball
@@ -103,19 +108,53 @@ static void run(void) {
 
 	// Check scores for winners..
 	if(score1 == 9) {
-		// Player 1 wins
+		menu = "Player 1 wins!";
+		state = STATE_UI;
 		score1 = score2 = 0;
 	}
 	if(score2 == 9) {
-		// Player 2 wins
+		menu = "Player 2 wins!";
+		state = STATE_UI;
 		score1 = score2 = 0;
 	}
 }
 
-static void display(void) {
-	glClear(GL_COLOR_BUFFER_BIT);
-	glColor3d(0.0, 0.0, 0.0);
+static void timer(int lastTime) {
+	if(state == STATE_UI) {
+		return;
+	}
+
+	int curTime = glutGet(GLUT_ELAPSED_TIME);
+	do {
+		lastTime += FRAME;
+		run();
+	} while(lastTime + FRAME < curTime);
+	glutPostRedisplay();
+	glutTimerFunc(FRAME - (curTime - lastTime), timer, curTime);
+}
 
+static void startGame(void) {
+	glutTimerFunc(FRAME, timer, glutGet(GLUT_ELAPSED_TIME));
+	initBall();
+}
+
+static void drawText(double x, double y, char* str) {
+	glRasterPos2d(x, y);
+	while(*str) {
+		glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, *str);
+		++str;
+	}
+}
+
+static void menuDisplay(void) {
+	drawText(-20, 50, "Awesome PONG!");
+	drawText(-50, -50, "Press 1 for a single player game.");
+	drawText(-50, -60, "Press 2 for a multi player game.");
+	drawText(-50, -70, "Keys: w/s and i/k");
+	drawText(-20, 0, menu);
+}
+
+static void gameDisplay(void) {
 	// Draw the paddles
 	glLineWidth(2.0);
 	glBegin(GL_LINES);
@@ -136,6 +175,17 @@ static void display(void) {
 	glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, '0' + score1);
 	glRasterPos2d( 5.0, HEIGHT - 10.0);
 	glutBitmapCharacter(GLUT_BITMAP_HELVETICA_18, '0' + score2);
+}
+
+static void display(void) {
+	glClear(GL_COLOR_BUFFER_BIT);
+	glColor3d(0.0, 0.0, 0.0);
+
+	if(state == STATE_UI) {
+		menuDisplay();
+	} else {
+		gameDisplay();
+	}
 
 	glutSwapBuffers();
 }
@@ -146,15 +196,24 @@ static void resize(int w, int h) {
 	glOrtho(-HEIGHT, HEIGHT, -HEIGHT, HEIGHT, -1.0, 1.0);
 }
 
-static void keyboard(unsigned char key, int x, int y) {
-	(void)x;(void)y;
-
+static void menuKeyboard(unsigned char key) {
 	switch(key) {
-		case 'q':
-		case 'Q':
-		case '\033':
-			exit(0);
+		case '1':
+			state = STATE_1P;
+			break;
 
+		case '2':
+			state = STATE_2P;
+			break;
+
+		default:
+			return;
+	}
+	startGame();
+}
+
+static void gameKeyboard(unsigned char key) {
+	switch(key) {
 		case 'w':
 			p1move = 1;
 			break;
@@ -175,6 +234,24 @@ static void keyboard(unsigned char key, int x, int y) {
 	glutPostRedisplay();
 }
 
+static void keyboard(unsigned char key, int x, int y) {
+	(void)x;(void)y;
+
+	switch(key) {
+		case 'q':
+		case 'Q':
+		case '\033':
+			exit(0);
+	}
+
+
+	if(state == STATE_UI) {
+		menuKeyboard(key);
+	} else {
+		gameKeyboard(key);
+	}
+}
+
 static void keyboardUp(unsigned char key, int x, int y) {
 	(void)x;(void)y;
 
@@ -192,26 +269,7 @@ static void keyboardUp(unsigned char key, int x, int y) {
 	}
 }
 
-static void timer(int lastTime) {
-	int curTime = glutGet(GLUT_ELAPSED_TIME);
-	do {
-		lastTime += FRAME;
-		run();
-	} while(lastTime + FRAME < curTime);
-	glutPostRedisplay();
-	glutTimerFunc(FRAME - (curTime - lastTime), timer, curTime);
-}
-
-static void init(void) {
-	glClearColor(1.0, 1.0, 1.0, 0.0);
-	initball();
-}
-
 int main(int argc, char *argv[]) {
-	if(argc == 2 && *argv[1] == '1') {
-		AI = 1;
-	}
-
 	glutInitWindowPosition(100, 100);
 	glutInitWindowSize(640, 480);
 	glutInit(&argc, argv);
@@ -221,8 +279,7 @@ int main(int argc, char *argv[]) {
 	glutReshapeFunc(resize);
 	glutKeyboardFunc(keyboard);
 	glutKeyboardUpFunc(keyboardUp);
-	glutTimerFunc(FRAME, timer, glutGet(GLUT_ELAPSED_TIME));
-	init();
+	glClearColor(1.0, 1.0, 1.0, 0.0);
 	glutMainLoop();
 	return 0;
 }
-- 
2.39.2