initial kart commit

games/config.in

@@ -9,4 +9,5 @@ comment "Games"
 	dep_bool "Space Invaders" GAME_SPACE_INVADERS $JOYSTICK_SUPPORT $RANDOM_SUPPORT
 	dep_bool "Snake"          GAME_SNAKE          $JOYSTICK_SUPPORT $RANDOM_SUPPORT
 	dep_bool "Breakout"       GAME_BREAKOUT       $JOYSTICK_SUPPORT $RANDOM_SUPPORT
+	dep_bool "Kart"       	  GAME_KART           $JOYSTICK_SUPPORT $RANDOM_SUPPORT
 endmenu

games/games.mk

@@ -20,3 +20,7 @@ endif
 ifeq ($(GAME_BREAKOUT),y)
   SUBDIRS += games/breakout
 endif
+
+ifeq ($(GAME_KART),y)
+  SUBDIRS += games/kart
+endif

games/kart/Makefile

@@ -0,0 +1,8 @@
+TARGET =
+TOPDIR = ../..
+
+include $(TOPDIR)/defaults.mk
+
+SRC = kart.c
+
+include $(TOPDIR)/rules.mk

games/kart/kart.c

@@ -0,0 +1,197 @@
+/*
+ * kart.c
+ *
+ *  Created on: 07.02.2014
+ *      Author: Stefan Kinzel
+ */
+
+
+#include <assert.h>
+#include <stdint.h>
+#include "../../config.h"
+#include "../../compat/pgmspace.h"
+#include "../../pixel.h"
+#include "../../random/prng.h"
+#include "../../util.h"
+#include "../../joystick/joystick.h"
+#include "../../menu/menu.h"
+#include "../../scrolltext/scrolltext.h"
+#include "kart.h"
+
+
+#include <stdio.h>
+
+
+#if defined MENU_SUPPORT && defined GAME_KART
+// icon (TODO: convert to hex)
+static const uint8_t icon[8] PROGMEM =
+	{	0b11100001,
+		0b11100001,
+		0b11000011,
+		0b10000111,
+		0b10000111,
+		0b11000011,
+		0b11000011,
+		0b10010111};
+
+game_descriptor_t kart_game_descriptor __attribute__((section(".game_descriptors"))) =
+{
+	&kart_game,
+	icon,
+};
+#endif
+
+#define WAIT 75
+
+#define DRIVEDIV 3
+#define MOVEDIV 1
+#define DECREASE_WIDTH_DIV 120
+
+#define CARCOLOR 3
+#define BORDERCOLOR 2
+#define LINECOLOR 1
+
+#define CURVE_PROP 30
+
+uint8_t borders[NUM_ROWS][2];
+
+void kart_game(){
+
+	// Initialisation
+	uint8_t carpos = NUM_COLS / 2;
+	uint32_t cycle = 0;
+	uint8_t draw_line = 1;
+	uint8_t width = NUM_COLS -2;
+	uint8_t middle = NUM_COLS / 2;
+	char game_over[100] = "";
+
+	clear_screen(0);
+
+	// init border memory
+	for(uint8_t row = 0; row < NUM_ROWS; row++){
+		borders[row][0] = middle;
+		borders[row][1] = width;
+	}
+
+	setpixel((pixel){carpos, NUM_ROWS-1}, CARCOLOR);
+
+	// Wait some seconds to start...
+	while(1){
+		cycle++;
+		wait(WAIT);
+		if(cycle >= DRIVEDIV*0){
+			break;
+		}
+	}
+
+	// main loop
+	while(1){
+
+		// DECREASE WIDTH
+		if(cycle % DECREASE_WIDTH_DIV == 0){
+			width--;
+		}
+
+		// MOVE-STEP
+		if(cycle % MOVEDIV == 0){
+			if (JOYISLEFT){
+				carpos++;
+				setpixel((pixel){carpos, NUM_ROWS-1}, 0);
+			}else if (JOYISRIGHT){
+				carpos--;
+				setpixel((pixel){carpos, NUM_ROWS-1}, 0);
+			}
+
+			if(check_collision(carpos)){
+				break;
+			}
+		}
+
+		// DRIVE-STEP
+		if(cycle % DRIVEDIV == 0){
+
+			// generate a route
+			int rnd = random8();
+			if(rnd < CURVE_PROP && middle-(width/2) > 1){
+				middle--;
+			}else if(rnd > 256-CURVE_PROP && middle+(width/2) < NUM_COLS-1){
+				middle++;
+			}
+
+			// shift pixmap down
+			drive();
+
+			// save border state
+			save_borders(middle, width);
+
+			// draw new first line
+			unsigned int px;
+			for(px=0; px < NUM_COLS; px++){
+				if(px<middle-(width/2) || px >= middle+(width/2)){
+					setpixel((pixel){px, 0}, BORDERCOLOR);
+				}
+			}
+		}
+
+		// toggle drawing the middle line
+		if(cycle % (DRIVEDIV*4) == 0){
+			draw_line = 1-draw_line;
+		}
+
+		// paint middle line
+		if(width > 4 && draw_line){
+			setpixel((pixel){middle, 0}, LINECOLOR);
+		}
+
+		// Paint car
+		setpixel((pixel){carpos, NUM_ROWS-1}, CARCOLOR);
+
+		cycle++;
+		wait(WAIT);
+	}
+
+	snprintf(game_over, sizeof(game_over), "</#Game Over, Score: %i",  cycle);
+	scrolltext(game_over);
+}
+
+/**
+ * Shifts the Pixmap one px down
+ */
+void drive(void){
+
+	unsigned char plane, row;
+
+	for(plane=0; plane<NUMPLANE; plane++){
+		for(row=NUM_ROWS-1;row>0; row--){
+			pixmap[plane][row][0] = pixmap[plane][row-1][0];
+			pixmap[plane][row][1] = pixmap[plane][row-1][1];
+		}
+		pixmap[plane][0][0] = 0x00;
+		pixmap[plane][0][1] = 0x00;
+	}
+
+}
+
+/**
+ * Save the border state at the top line, so collision detection can
+ * work in the last line (where the car is).
+ */
+void save_borders(uint8_t middle, uint8_t width){
+	uint8_t row;
+	for(row = NUM_ROWS-1; row > 0 ; row--){
+		borders[row][0] = borders[row-1][0];
+		borders[row][1] = borders[row-1][1];
+	}
+	borders[0][0] = middle;
+	borders[0][1] = width;
+}
+
+/**
+ * check if collision occours
+ */
+uint8_t check_collision(uint8_t carpos){
+	uint8_t middle = borders[NUM_ROWS-1][0];
+	uint8_t width = borders[NUM_ROWS-1][1];
+
+	return ( carpos<middle-(width/2) || carpos >= middle+(width/2) );
+}

games/kart/kart.h

@@ -0,0 +1,17 @@
+/*
+ * kart.h
+ *
+ *  Created on: 07.02.2014
+ *      Author: Stefan Kinzel
+ */
+
+#ifndef KART_H_
+#define KART_H_
+
+void kart_game(void);
+
+void drive(void);
+void save_borders(uint8_t middle, uint8_t width);
+uint8_t check_collision(uint8_t carpos);
+
+#endif /* KART_H_ */