first commit

Makefile

@@ -0,0 +1,28 @@
+.PHONY: all clean run
+VERSION = 0.0.1
+
+LIBS = sdl2
+CMACRO = -DVERSION=\"$(VERSION)\"
+
+CC = gcc
+CFLAGS = -g -Wall -Wextra -pedantic $(shell pkg-config $(LIBS) --cflags) $(CMACRO)
+LDFLAGS = $(shell pkg-config $(LIBS) --libs) -lm
+
+all: pong 
+
+pong: pong.o
+	$(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+clean: 
+	rm -f *.o
+	rm -f pong 
+
+bear: clean
+	bear -- make
+
+run: pong 
+	./$<
+

pong.c

@@ -0,0 +1,84 @@
+#include <SDL2/SDL.h>
+#include <SDL2/SDL_error.h>
+#include <SDL2/SDL_events.h>
+#include <SDL2/SDL_rect.h>
+#include <SDL2/SDL_render.h>
+#include <SDL2/SDL_video.h>
+
+#include <unistd.h>
+
+#define WIDTH 1920 
+#define HEIGHT 1200
+#define BALLSIZE 50
+
+SDL_Window *win;	
+SDL_Renderer *ren;	
+
+struct {
+	int x, y;
+	float dx, dy;
+} ballPos = {10, 10, 3, 2};
+
+void* cpv(void * v, const char *msg){
+	if( v == 0 ){
+		fprintf(stderr, "%s -> %s\n",msg, SDL_GetError());
+		exit(1);
+	}
+	return v;
+}
+
+int civ(int v, const char *msg){
+	if( v != 0 ){
+		fprintf(stderr, "%s -> %s\n",msg, SDL_GetError());
+		exit(1);
+	}
+	return v;
+}
+
+void ballMove(){
+	if(ballPos.x <=0 || ballPos.x >= WIDTH - BALLSIZE){
+	   	ballPos.dx = ballPos.dx * -1;
+		ballPos.dy = (ballPos.dy / abs(ballPos.dy)) * ((rand() % 5) + 1);
+	}
+	if(ballPos.y <=0 || ballPos.y >= HEIGHT - BALLSIZE){
+	   	ballPos.dy = ballPos.dy * -1;
+		ballPos.dx = (ballPos.dx / abs(ballPos.dx)) * ((rand() % 5) + 1);
+	}
+	ballPos.x = ballPos.x + ballPos.dx;
+	ballPos.y = ballPos.y + ballPos.dy;
+}
+
+int main()
+{
+	civ(SDL_Init(SDL_INIT_VIDEO), "can't init SDL");
+
+	win = cpv(SDL_CreateWindow("pong", 0, 0, WIDTH, HEIGHT, SDL_WINDOW_SHOWN), "can't create window");
+	ren = cpv(SDL_CreateRenderer(win, -1, SDL_RENDERER_SOFTWARE), "can't create renderer");
+
+	int i = 0;
+	SDL_RenderClear(ren);
+
+	SDL_bool should_close = SDL_FALSE;
+	SDL_Event e;
+	while(!should_close){
+		while(SDL_PollEvent(&e)){
+			if(e.type == SDL_QUIT){
+				should_close = SDL_TRUE;
+			}
+		}
+		/* SDL_SetRenderDrawColor(ren, 0, 0, 0, 255); */
+		/* SDL_RenderClear(ren); */
+
+		ballMove();
+
+		SDL_SetRenderDrawColor(ren, (sin((double)i/20) + 1) * 128, (cos((double)i/10) + 1) * 128, (sin((double)i/50) + 1) * 128, 255);
+		SDL_Rect ball = {ballPos.x, ballPos.y, BALLSIZE, BALLSIZE};
+		SDL_RenderFillRect(ren, &ball);
+
+
+		SDL_RenderPresent(ren);
+		i++;
+	}
+
+	return 0;
+}