ups

3 files changed, 255 insertions, 0 deletions

diff --git a/05-brain/Makefile b/05-brain/Makefile
new file mode 100644
index 0000000..d0464d9
--- /dev/null
+++ b/05-brain/Makefile
@@ -0,0 +1,29 @@
+CFLAGS+=-Wall -O2 $(shell pkg-config --cflags allegro-5 allegro_primitives-5 libsodium)
+CFLAGSDEBUG=-Wall -ggdb3 -O0 -DDEBUG $(shell pkg-config --cflags allegro-5 allegro_primitives-5)
+LDFLAGS+=-Wall -O2 $(shell pkg-config --libs allegro-5 allegro_primitives-5 libsodium)
+LDFLAGSDEBUG=-Wall -ggdb3 -O0 -DDEBUG $(shell pkg-config --libs allegro-5 allegro_primitives-5)
+SRCDIR=./src
+OBJDIR=./build
+SRC=$(wildcard $(SRCDIR)/*.c)
+OBJ=$(patsubst $(SRCDIR)%.c,$(OBJDIR)%.o,$(SRC))
+BIN=brain
+
+all: $(OBJ)
+	$(CC) $(LDFLAGS) -o $(BIN) $^
+
+$(OBJ): | $(OBJDIR)
+
+$(OBJDIR)/%.o: $(SRCDIR)/%.c
+	$(CC) $(CFLAGS) -c -o $@ $<
+
+$(OBJDIR):
+	mkdir -p $(OBJDIR)
+
+clean:
+	rm -rf $(OBJDIR) $(BIN)
+
+debug: CFLAGS=$(CFLAGSDEBUG)
+debug: LDFLAGS=$(LDFLAGSDEBUG)
+debug: all
+
+new: clean all
diff --git a/05-brain/screenshot.png b/05-brain/screenshot.png
new file mode 100644
index 0000000..4803800
--- /dev/null
+++ b/05-brain/screenshot.png
diff --git a/05-brain/src/main.c b/05-brain/src/main.c
new file mode 100644
index 0000000..dfa2d2c
--- /dev/null
+++ b/05-brain/src/main.c
@@ -0,0 +1,226 @@
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <allegro5/allegro5.h>
+#include <allegro5/allegro_primitives.h>
+
+#include <sodium.h>
+
+#define BUF_W 256
+#define BUF_H 256
+
+#define DISP_SCALE 3
+
+#define SEED_BITS 4096
+
+#define FPS 30.0
+
+#define DO_INIT(check, desc) \
+	if (!(check)) { \
+		fprintf(stderr, "err: can't initialise %s\n", desc); \
+		rval = 1; \
+		goto done; \
+	}
+
+int main(int argc, char **argv)
+{
+	int rval = 0;
+
+	uint8_t bits1[BUF_H][BUF_W] = {0};
+	uint8_t bits2[BUF_H][BUF_W] = {0};
+
+	uint8_t framerate = 8;
+	unsigned goframes = 1;
+	unsigned x, y, sum;
+
+	bool pause = true;
+	bool mouse_down = false;
+
+	ALLEGRO_MOUSE_STATE ms;
+
+	ALLEGRO_DISPLAY *d = NULL;
+	ALLEGRO_BITMAP *b = NULL;
+	ALLEGRO_TIMER *t = NULL;
+	ALLEGRO_EVENT_QUEUE *eq = NULL;
+	ALLEGRO_EVENT e;
+
+
+	DO_INIT(sodium_init() >= 0, "sodium");
+
+	DO_INIT(al_init(), "allegro");
+	DO_INIT(al_init_primitives_addon(), "primitives");
+	DO_INIT(al_install_keyboard(), "keyboard");
+	DO_INIT(al_install_mouse(), "mouse");
+
+	DO_INIT(t = al_create_timer(1.0 / FPS), "timer");
+	DO_INIT(eq = al_create_event_queue(), "event queue");
+
+	al_set_new_display_option(ALLEGRO_SINGLE_BUFFER, 1, ALLEGRO_REQUIRE);
+	DO_INIT(d = al_create_display(
+			DISP_SCALE * BUF_W, DISP_SCALE * BUF_H
+			), "display"
+	);
+	al_set_new_bitmap_flags(ALLEGRO_MEMORY_BITMAP);
+	DO_INIT(b = al_create_bitmap(BUF_W, BUF_H), "buffer");
+
+	al_register_event_source(eq, al_get_keyboard_event_source());
+	al_register_event_source(eq, al_get_mouse_event_source());
+	al_register_event_source(eq, al_get_display_event_source(d));
+	al_register_event_source(eq, al_get_timer_event_source(t));
+
+
+	al_start_timer(t);
+
+reset:
+
+	memset(bits1, 0, sizeof(bits1));
+
+	while(true) {
+		al_wait_for_event(eq, &e);
+
+		switch (e.type) {
+
+		case ALLEGRO_EVENT_DISPLAY_CLOSE:
+			goto done;
+
+		case ALLEGRO_EVENT_MOUSE_BUTTON_DOWN:
+			bits1[e.mouse.y / DISP_SCALE][e.mouse.x / DISP_SCALE] = 1;
+			mouse_down = true;
+			break;
+
+		case ALLEGRO_EVENT_MOUSE_BUTTON_UP:
+			mouse_down = false;
+			break;
+
+		case ALLEGRO_EVENT_KEY_DOWN:
+			switch(e.keyboard.keycode) {
+
+			case ALLEGRO_KEY_Q:
+				goto done;
+
+			case ALLEGRO_KEY_1:
+				framerate = (framerate == 1 ? 16 : framerate / 2);
+				printf("fps: %.1f\n", FPS / ((float)framerate) );
+				break;
+
+			case ALLEGRO_KEY_2:
+				memset(bits1, 0, sizeof(bits1));
+				for (x = 0; x < SEED_BITS; x++) {
+					bits1[randombytes_random() % BUF_H][randombytes_random() % BUF_W] = 1;
+				}
+				break;
+
+			case ALLEGRO_KEY_3:
+				goto reset;
+
+			case ALLEGRO_KEY_ENTER:
+				pause = !pause;
+				printf("%s\n", pause ? "pause" : "play");
+				break;
+
+			default:
+				break;
+
+			}
+
+			break;
+
+		case ALLEGRO_EVENT_TIMER:
+
+			if (mouse_down) {
+				al_get_mouse_state(&ms);
+				bits1[ms.y / DISP_SCALE][ms.x / DISP_SCALE] = 1;
+			}
+
+			/* step */
+
+			if (goframes) {
+				goframes--;
+			} else if (!pause) {
+				for (y = 0; y < BUF_H; y++) {
+					for (x = 0; x < BUF_W; x++) {
+						if (bits1[y][x] == 2) {
+							bits2[y][x] = 0;
+							continue;
+						}
+
+						if (bits1[y][x] == 1) {
+							bits2[y][x] = 2;
+							continue;
+						}
+
+						sum =
+							  (1 == bits1[(y-1) % BUF_H][(x-1) % BUF_W])
+							+ (1 == bits1[(y-1) % BUF_H][ x           ])
+							+ (1 == bits1[(y-1) % BUF_H][(x+1) % BUF_W])
+							+ (1 == bits1[ y           ][(x-1) % BUF_W])
+							+ (1 == bits1[ y           ][(x+1) % BUF_W])
+							+ (1 == bits1[(y+1) % BUF_H][(x-1) % BUF_W])
+							+ (1 == bits1[(y+1) % BUF_H][ x           ])
+							+ (1 == bits1[(y+1) % BUF_H][(x+1) % BUF_W])
+						;
+
+						if (sum == 2)
+							bits2[y][x] = 1;
+					}
+				}
+
+				memcpy(bits1, bits2, sizeof(bits1));
+				goframes = framerate;
+			}
+
+			/* draw frame */
+
+			al_lock_bitmap(b, ALLEGRO_PIXEL_FORMAT_ANY, ALLEGRO_LOCK_WRITEONLY);
+
+			al_set_target_bitmap(b);
+
+			for (y = 0; y < BUF_H; y++) {
+				for (x = 0; x < BUF_W; x++) {
+					switch (bits1[y][x]) {
+
+					case 0:
+						al_put_pixel(x, y, al_map_rgb(0, 0, 0));
+						break;
+
+					case 1:
+						al_put_pixel(x, y, al_map_rgb(255, 255, 255));
+						break;
+
+					case 2:
+						al_put_pixel(x, y, al_map_rgb(255, 0, 0));
+						break;
+
+					}
+				}
+			}
+
+			al_unlock_bitmap(b);
+
+			al_set_target_backbuffer(d);
+			al_draw_scaled_bitmap(b,
+				0, 0, BUF_W, BUF_H,
+				0, 0, DISP_SCALE * BUF_W, DISP_SCALE * BUF_H,
+				0
+			);
+			al_flip_display();
+
+		}
+	}
+
+
+done:
+
+	if (d)
+		al_destroy_display(d);
+	if (b)
+		al_destroy_bitmap(b);
+	if (t)
+		al_destroy_timer(t);
+	if (eq)
+		al_destroy_event_queue(eq);
+	
+	return rval;
+}