Finally snake.c draws something. Deadlin is in 2 hours and we are still making babysteps, great

Makefile

@@ -108,7 +108,7 @@ debug-nox: image.bin
 		-ex "break _start" \
 		-ex "continue"
 
-USERPROGS=./user/false ./user/greet ./user/div0 ./user/shout ./user/badputs ./user/bss ./user/snake ./user/player
+USERPROGS=./user/false ./user/greet ./user/div0 ./user/shout ./user/badputs ./user/bss ./user/player ./snake/snake
 
 fs.img: ./kernel.bin ./tools/mkfs $(USERPROGS)
 	./tools/mkfs $@ $< $(USERPROGS)
@@ -118,6 +118,9 @@ LDFLAGS=-m elf_i386
 user/%: user/%.o user/crt.o
 	$(LD) $(LDFLAGS) -o $@ -Ttext 0x401000 $^
 
+snake/snake: snake/snake.o user/crt.o
+	$(LD) $(LDFLAGS) -o $@ -Ttext 0x401000 $^
+
 kernel.bin: $(OBJECTS)
 	$(LD) $(LDFLAGS) $(LDKERNELFLAGS) -o $@ -Ttext 0x80009000 $^
 

snake/map_data.h

@@ -0,0 +1,184 @@
+#pragma once
+
+#include "maps.h"
+
+static const MapList map_list = {
+    .maps = {
+        /* CLUSTERTRACT.png */
+        [0] = {
+            .name = "CLUSTERTRACT",
+            .map = {
+                [0] = { tile_wall_t, tile_wall_lr, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall_lr, tile_wall_b },
+                [1] = { tile_wall_rb, tile_wall_lt, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall_lb, tile_wall_rt },
+                [2] = { tile_wall_lr, tile_wall_rb, tile_wall_lt, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lb, tile_wall_rt, tile_wall_lr },
+                [3] = { tile_wall_lr, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall_lr },
+                [4] = { tile_wall_lr, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall_lr },
+                [5] = { tile_wall_lr, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_b, tile_wall_lrt, tile_wall_lr },
+                [6] = { tile_wall_lr, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall_lr },
+                [7] = { tile_wall_lr, tile_wall_lrb, tile_wall_rt, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall_lr },
+                [8] = { tile_wall_lr, tile_wall_lrb, tile_wall_lt, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_rb, tile_wall_lrt, tile_wall_lr },
+                [9] = { tile_wall_lr, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lb, tile_wall_lrt, tile_wall_lr },
+                [10] = { tile_wall_lr, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall_lr },
+                [11] = { tile_wall_lr, tile_wall_lrb, tile_wall_t, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall_lr },
+                [12] = { tile_wall_lr, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall_lr },
+                [13] = { tile_wall_lr, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall_lr },
+                [14] = { tile_wall_lr, tile_wall_lb, tile_wall_rt, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_rb, tile_wall_lt, tile_wall_lr },
+                [15] = { tile_wall_lb, tile_wall_rt, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall_rb, tile_wall_lt },
+            },
+        },
+        /* EMPTY.png */
+        [1] = {
+            .name = "EMPTY",
+            .map = {
+                [0] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [1] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [2] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [3] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [4] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [5] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [6] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [7] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [8] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [9] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [10] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [11] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [12] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [13] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [14] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [15] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+            },
+        },
+        /* GREEN DAYS.png */
+        [2] = {
+            .name = "GREEN DAYS",
+            .map = {
+                [0] = { tile_wall_rb, tile_wall_tb, tile_wall_tb, tile_wall_t, tile_empty, tile_empty, tile_wall_b, tile_wall_tb, tile_wall_tb, tile_wall_rt },
+                [1] = { tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr },
+                [2] = { tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr },
+                [3] = { tile_wall_l, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_l },
+                [4] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [5] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [6] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [7] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [8] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [9] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [10] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [11] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [12] = { tile_wall_r, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_r },
+                [13] = { tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr },
+                [14] = { tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr },
+                [15] = { tile_wall_lb, tile_wall_tb, tile_wall_tb, tile_wall_t, tile_empty, tile_empty, tile_wall_b, tile_wall_tb, tile_wall_tb, tile_wall_lt },
+            },
+        },
+        /* QUARTERHOUSE.png */
+        [3] = {
+            .name = "QUARTERHOUSE",
+            .map = {
+                [0] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [1] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [2] = { tile_empty, tile_empty, tile_empty, tile_wall_b, tile_wall_rtb, tile_wall_tb, tile_wall_t, tile_empty, tile_empty, tile_empty },
+                [3] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall, tile_empty, tile_empty, tile_empty, tile_empty },
+                [4] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall, tile_empty, tile_empty, tile_empty, tile_empty },
+                [5] = { tile_wall_rt, tile_empty, tile_empty, tile_empty, tile_wall_lb, tile_wall_rt, tile_empty, tile_empty, tile_empty, tile_wall_rb },
+                [6] = { tile_wall_lrt, tile_empty, tile_empty, tile_empty, tile_wall, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_wall_lrb },
+                [7] = { tile_wall_lrt, tile_wall, tile_wall_rb, tile_wall_tb, tile_wall_rtb, tile_wall_lrtb, tile_wall_tb, tile_wall_rt, tile_wall, tile_wall_lrb },
+                [8] = { tile_wall_lrtb, tile_wall_tb, tile_wall_lt, tile_wall, tile_wall_lrb, tile_wall_lt, tile_wall, tile_wall_lb, tile_wall_tb, tile_wall_lrtb },
+                [9] = { tile_wall_lrt, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_wall, tile_empty, tile_empty, tile_empty, tile_wall_lrb },
+                [10] = { tile_wall_lt, tile_empty, tile_empty, tile_empty, tile_wall_lb, tile_wall_rt, tile_empty, tile_empty, tile_empty, tile_wall_lb },
+                [11] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_wall, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty },
+                [12] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_wall, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty },
+                [13] = { tile_empty, tile_empty, tile_empty, tile_wall_b, tile_wall_tb, tile_wall_ltb, tile_wall_t, tile_empty, tile_empty, tile_empty },
+                [14] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [15] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+            },
+        },
+        /* SERPENTINE STRUTS.png */
+        [4] = {
+            .name = "SERPENTINE STRUTS",
+            .map = {
+                [0] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [1] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_r, tile_empty, tile_empty, tile_wall_r, tile_empty, tile_empty },
+                [2] = { tile_empty, tile_empty, tile_empty, tile_wall_b, tile_wall_lrtb, tile_wall_tb, tile_wall_tb, tile_wall_lrtb, tile_wall_t, tile_empty },
+                [3] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_l, tile_empty, tile_empty, tile_wall_l, tile_empty, tile_empty },
+                [4] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [5] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [6] = { tile_empty, tile_empty, tile_empty, tile_wall_r, tile_empty, tile_empty, tile_wall_r, tile_empty, tile_empty, tile_empty },
+                [7] = { tile_empty, tile_empty, tile_wall_b, tile_wall_lrtb, tile_wall_tb, tile_wall_tb, tile_wall_lrtb, tile_wall_t, tile_empty, tile_empty },
+                [8] = { tile_empty, tile_empty, tile_empty, tile_wall_l, tile_empty, tile_empty, tile_wall_l, tile_empty, tile_empty, tile_empty },
+                [9] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [10] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [11] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [12] = { tile_empty, tile_empty, tile_wall_r, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_r, tile_empty, tile_empty },
+                [13] = { tile_empty, tile_wall_b, tile_wall_lrtb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_lrtb, tile_wall_t, tile_empty },
+                [14] = { tile_empty, tile_empty, tile_wall_l, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_l, tile_empty, tile_empty },
+                [15] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+            },
+        },
+        /* SHEER GIRTH.png */
+        [5] = {
+            .name = "SHEER GIRTH",
+            .map = {
+                [0] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [1] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [2] = { tile_empty, tile_wall_rb, tile_wall_rtb, tile_wall_rtb, tile_wall_rtb, tile_wall_rtb, tile_wall_rtb, tile_wall_rtb, tile_wall_rt, tile_empty },
+                [3] = { tile_empty, tile_wall_lrb, tile_wall_lrtb, tile_wall_lrtb, tile_wall_lrtb, tile_wall_lrtb, tile_wall_lrtb, tile_wall_lrtb, tile_wall_lrt, tile_empty },
+                [4] = { tile_empty, tile_wall_lb, tile_wall_ltb, tile_wall_ltb, tile_wall_ltb, tile_wall_ltb, tile_wall_ltb, tile_wall_ltb, tile_wall_lt, tile_empty },
+                [5] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [6] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [7] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [8] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [9] = { tile_empty, tile_wall_rb, tile_wall_rtb, tile_wall_rt, tile_empty, tile_empty, tile_wall_rb, tile_wall_rtb, tile_wall_rt, tile_empty },
+                [10] = { tile_empty, tile_wall_lrb, tile_wall_lrtb, tile_wall_lrt, tile_empty, tile_empty, tile_wall_lrb, tile_wall_lrtb, tile_wall_lrt, tile_empty },
+                [11] = { tile_empty, tile_wall_lrb, tile_wall_lrtb, tile_wall_lrt, tile_empty, tile_empty, tile_wall_lrb, tile_wall_lrtb, tile_wall_lrt, tile_empty },
+                [12] = { tile_empty, tile_wall_lrb, tile_wall_lrtb, tile_wall_lrt, tile_empty, tile_empty, tile_wall_lrb, tile_wall_lrtb, tile_wall_lrt, tile_empty },
+                [13] = { tile_empty, tile_wall_lb, tile_wall_ltb, tile_wall_lt, tile_empty, tile_empty, tile_wall_lb, tile_wall_ltb, tile_wall_lt, tile_empty },
+                [14] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [15] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+            },
+        },
+        /* VAULT.png */
+        [6] = {
+            .name = "VAULT",
+            .map = {
+                [0] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [1] = { tile_empty, tile_empty, tile_empty, tile_wall_rb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_rt, tile_empty },
+                [2] = { tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty },
+                [3] = { tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty },
+                [4] = { tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty },
+                [5] = { tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty },
+                [6] = { tile_empty, tile_empty, tile_empty, tile_wall_lb, tile_wall_t, tile_empty, tile_empty, tile_wall_b, tile_wall_lrt, tile_empty },
+                [7] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty },
+                [8] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty },
+                [9] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty },
+                [10] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty },
+                [11] = { tile_empty, tile_empty, tile_wall_rb, tile_wall_t, tile_empty, tile_empty, tile_wall_b, tile_wall_tb, tile_wall_lrt, tile_empty },
+                [12] = { tile_empty, tile_empty, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty },
+                [13] = { tile_empty, tile_empty, tile_wall_lr, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_wall_lr, tile_empty },
+                [14] = { tile_empty, tile_empty, tile_wall_lb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_lt, tile_empty },
+                [15] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+            },
+        },
+        /* WALLS.png */
+        [7] = {
+            .name = "WALLS",
+            .map = {
+                [0] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [1] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [2] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [3] = { tile_wall_tb, tile_wall_t, tile_empty, tile_empty, tile_wall_b, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb },
+                [4] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [5] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [6] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [7] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [8] = { tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_t, tile_empty, tile_empty, tile_wall_b, tile_wall_tb, tile_wall_tb },
+                [9] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [10] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [11] = { tile_wall_t, tile_empty, tile_empty, tile_wall_b, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb },
+                [12] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [13] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+                [14] = { tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_tb, tile_wall_t, tile_empty, tile_empty, tile_wall_b },
+                [15] = { tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty, tile_empty },
+            },
+        },
+    }
+};

snake/maps.h

@@ -0,0 +1,72 @@
+#pragma once
+
+#include "misc_utils.h"
+
+typedef enum {
+    tile_empty = 0,
+    tile_apple = 1,
+    tile_wall = 2,
+    tile_wall_lr = 3,
+    tile_wall_l = 4,
+    tile_wall_r = 5,
+    tile_wall_lrt = 6,
+    tile_wall_lt = 7,
+    tile_wall_rt = 8,
+    tile_wall_lrb = 9,
+    tile_wall_lb = 10,
+    tile_wall_rb = 11,
+    tile_wall_lrtb = 12,
+    tile_wall_ltb = 13,
+    tile_wall_rtb = 14,
+    tile_wall_t = 15,
+    tile_wall_b = 16,
+    tile_wall_tb = 17,
+
+    tile_snake_l = 18,
+    tile_snake_r = 19,
+    tile_snake_t = 20,
+    tile_snake_b = 21,
+    tile_snake_bl = 22,
+    tile_snake_br = 23,
+    tile_snake_lb = 24,
+    tile_snake_rb = 25,
+    tile_snake_tl = 26,
+    tile_snake_tr = 27,
+    tile_snake_lt = 28,
+    tile_snake_rt = 29,
+
+    tile_pupa_m2_l = 30,
+    tile_pupa_m2_r = 31,
+    tile_pupa_m1_l = 32,
+    tile_pupa_m1_r = 33,
+    tile_pupa_0_l = 34,
+    tile_pupa_0_r = 35,
+    tile_pupa_p1_l = 36,
+    tile_pupa_p1_r = 37,
+    tile_pupa_p2_l = 38,
+    tile_pupa_p2_r = 39,
+    tile_pupa_m2_t = 40,
+    tile_pupa_m1_t = 41,
+    tile_pupa_0_t = 42,
+    tile_pupa_p1_t = 43,
+    tile_pupa_p2_t = 44,
+    tile_pupa_m2_b = 45,
+    tile_pupa_m1_b = 46,
+    tile_pupa_0_b = 47,
+    tile_pupa_p1_b = 48,
+    tile_pupa_p2_b = 49,
+} tile_t;
+
+#define WORLD_WIDTH 16
+#define WORLD_HEIGHT 10
+
+typedef struct {
+    const char* name;
+    tile_t map[WORLD_WIDTH][WORLD_HEIGHT];
+} MapConfig;
+
+#define PLAYABLE_MAPS_COUNT 8
+
+typedef struct {
+    MapConfig maps[PLAYABLE_MAPS_COUNT];
+} MapList;

snake/misc_utils.h

@@ -0,0 +1,86 @@
+#pragma once
+
+#include "../syscall.h"
+#include <stdbool.h>
+#include <stdint.h>
+
+void _Noreturn panic(const char* message) {
+    syscall(SYS_switch_to_text, 0); // ???
+    syscall(SYS_puts, (uintptr_t)message);
+    syscall(SYS_exit, 1);
+    __builtin_unreachable();
+}
+
+#define check(expr) if (!(expr)){ panic( "Assertion failed at " __FILE__ ": " #expr); }
+
+typedef struct {
+    int x, y;
+} ivec2;
+
+void* memcpy(void* dst, const void* src, uint32_t size) {
+    uint8_t* d = (uint8_t*)dst;
+    const uint8_t* s = (const uint8_t*)src;
+    for (uint32_t i = 0; i < size; i++) {
+        d[i] = s[i];
+    }
+    return dst;
+}
+
+void* memset(void* dst, int value, uint32_t size) {
+    uint8_t* d = (uint8_t*)dst;
+    uint8_t byte = (uint8_t)value;
+    for (uint32_t i = 0; i < size; i++) {
+        d[i] = byte;
+    }
+    return dst;
+}
+
+#define STRING_BUILDER_CAPACITY 150
+
+typedef struct {
+    char buf[STRING_BUILDER_CAPACITY];
+    int len;
+} StringBuilder;
+
+void StringBuilder_putc(StringBuilder* self, char ch) {
+    if (self->len + 1 > STRING_BUILDER_CAPACITY) {
+        panic("string builder\n");
+    }
+    self->buf[self->len++] = ch;
+}
+
+void StringBuilder_append_cstr(StringBuilder* self, const char* str) {
+    for (const char* p = str; *p; p++) {
+        StringBuilder_putc(self, *p);
+    }
+}
+
+void StringBuilder_append_u32(StringBuilder* self, uint32_t x) {
+    char b[11];
+    int len = 0;
+
+    if (x == 0) {
+        b[len++] = '0';
+    } else {
+        while (x > 0) {
+            b[len++] = (char)('0' + (x % 10));
+            x /= 10;
+        }
+        int i = 0, j = len - 1;
+        while (i < j) {
+            char tmp = b[i];
+            b[i] = b[j];
+            b[j] = tmp;
+            i++;
+            j--;
+        }
+    }
+
+    b[len] = 0;
+    StringBuilder_append_cstr(self, b);
+}
+
+const char* StringBuilder_get_cstr(StringBuilder* self) {
+    StringBuilder_putc(self, 0);
+    return self->buf;
+}

snake/pause_effect.h

@@ -0,0 +1,26 @@
+#pragma once
+
+#include <stdint.h>
+
+static const uint8_t VGA_GRAY_LUT[256] = {
+    16, 17, 23, 24, 20, 21, 23, 27, 22, 23, 28, 29, 25, 27, 30, 31,
+    16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31,
+    18, 19, 21, 22, 23, 23, 23, 22, 22, 24, 26, 28, 30, 29, 28, 27,
+    26, 27, 27, 27, 28, 26, 23, 21, 26, 26, 27, 27, 28, 28, 27, 27,
+    27, 28, 29, 30, 30, 30, 30, 29, 29, 29, 29, 29, 30, 29, 28, 27,
+    28, 29, 29, 29, 29, 29, 29, 29, 29, 29, 30, 30, 31, 30, 30, 30,
+    30, 30, 30, 30, 30, 30, 29, 29, 17, 17, 18, 18, 19, 19, 19, 18,
+    18, 19, 21, 22, 23, 23, 22, 21, 21, 21, 21, 22, 22, 21, 19, 18,
+    20, 21, 21, 21, 22, 22, 22, 21, 21, 22, 23, 23, 24, 23, 23, 23,
+    22, 23, 23, 23, 23, 22, 22, 21, 22, 22, 22, 23, 23, 23, 23, 23,
+    23, 23, 23, 23, 24, 24, 23, 23, 23, 23, 23, 23, 23, 23, 23, 22,
+    16, 17, 17, 17, 18, 17, 17, 17, 17, 18, 18, 19, 20, 20, 19, 19,
+    18, 19, 19, 19, 19, 18, 17, 17, 18, 18, 19, 19, 19, 19, 19, 19,
+    19, 19, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 20, 19, 19, 19,
+    19, 19, 19, 20, 20, 20, 20, 20, 19, 20, 20, 20, 21, 20, 20, 20,
+    20, 20, 20, 20, 20, 20, 20, 19, 16, 16, 16, 16, 16, 16, 16, 16,
+};
+
+static inline uint8_t vga_to_gray(uint8_t color){
+    return VGA_GRAY_LUT[color];
+}

snake/random.h

@@ -0,0 +1,4 @@
+#pragma once
+
+#include <stdint.h>
+

snake/snake.c

@@ -0,0 +1,262 @@
+#include "../drivers/vga.h"
+#include "../syscall.h"
+
+#include "sprites.h"
+#include <stdbool.h>
+#include <stdint.h>
+#include "misc_utils.h"
+#include "pause_effect.h"
+
+#include "sprites.h"
+#include "sprite_data.h"
+#include "maps.h"
+#include "map_data.h"
+
+#define FRAME_SIZE (VGA_GRAPHICS_WIDTH * VGA_GRAPHICS_HEIGHT)
+
+#define HUD_OFFSET 3
+#define GLYPH_SPACING 3
+
+#define FONT_SPACE_INDEX 0
+#define FONT_DIGIT_BASE 1
+#define FONT_LETTER_BASE (FONT_DIGIT_BASE + 10)
+
+uint8_t frame[FRAME_SIZE] = { 1 };
+
+#define SNAKE_GAMEMODE_MAX_APPLES 10
+#define SNAKE_GAMEMODE_DEFAULT_APPLES 5
+
+typedef enum {
+    game_screen_gaming,
+    game_screen_pause,
+    game_screen_select_map,
+    game_screen_select_apple_count,
+} GameScreen;
+
+
+#define SNAKE_START_Y  2
+#define SNAKE_START_HEAD_X 4
+#define SNAKE_START_PUPA_X 6
+
+typedef enum {
+    snake_direction_left = 0,
+    snake_direction_right = 1,
+    snake_direction_top = 2,
+    snake_direction_bottom = 3,
+} SnakeDirection;
+
+#define WALKING_ANIM_TIME_SLOW 500
+#define HATCHING_ANIM_TIME_SLOW 200
+#define WALKING_ANIM_TIME_FAST 200
+#define HATCHING_ANIM_TIME_FAST 80
+
+struct Snake {
+    GameScreen game_screen;
+    bool have_game;
+    /* from 0 to PLAYABLE_MAPS_COUNT - 1 */
+    int selected_map_index;
+    /* from 1 to SNAKE_GAMEMODE_MAX_APPLES, default is SNAKE_GAMEMODE_DEFAULT_APPLES */
+    int gamemode_apples_count;
+
+    tile_t world[WORLD_WIDTH][WORLD_HEIGHT];
+    uint8_t ghost_apples[WORLD_WIDTH][WORLD_HEIGHT];
+    ivec2 snake_head;
+    ivec2 snake_pupa;
+    bool is_time_sped_up;
+    SnakeDirection cur_snake_direction;
+    SnakeDirection new_snake_direction;
+    /* If we are about to make a step into a wall, we start dying,
+     * we enter into dying mode, where we keep making steps, but the head
+     * just disappears after walking, moving back.
+     * When the pupa disappears this way, we enter is_dead state, where
+     * nothing moves.
+     * If we are about to hit ourselves, we don't even move,
+     * we immediately draw one small splash and enter is_dead state.
+     * There is no winning state, you just raise your score until you are dead.
+     */
+    bool is_dying;
+    bool is_dead;
+    int score;
+
+} snake = {1};
+
+void init_snake() {
+    snake.game_screen = game_screen_pause;
+    snake.have_game = false;
+    snake.selected_map_index = 0;
+    snake.gamemode_apples_count = SNAKE_GAMEMODE_DEFAULT_APPLES;
+    /* snake_head and snake_pupa and snake.world
+     * and other gameplay-related variables will be initialized during
+     * map loading */
+}
+
+void start_snake_game() {
+    snake.have_game = true;
+    snake.game_screen = game_screen_gaming;
+    const MapConfig* map_config = &map_list.maps[snake.selected_map_index];
+    memcpy(&snake.world[0][0], &map_config->map[0][0], sizeof(tile_t) * WORLD_WIDTH * WORLD_HEIGHT);
+    memset(&snake.ghost_apples, 0, sizeof(snake.ghost_apples));
+    for (int tx = SNAKE_START_HEAD_X; tx < SNAKE_START_PUPA_X; tx++) {
+        snake.world[tx][SNAKE_START_Y] = tile_snake_l;
+    }
+    snake.world[SNAKE_START_PUPA_X][SNAKE_START_Y] = tile_pupa_0_l;
+    snake.new_snake_direction = snake.cur_snake_direction = snake_direction_left;
+    snake.is_dying = false;
+    snake.is_dead = false;
+    snake.score = 0;
+}
+
+
+uint32_t time_ms(void) {
+    return (uint32_t)syscall(SYS_time_ms, 0);
+}
+
+void clear_frame(uint8_t color) {
+    for (uint32_t i = 0; i < FRAME_SIZE; i++) {
+        frame[i] = color;
+    }
+}
+
+void put_pixel(int x, int y, uint8_t color) {
+    if (x < 0 || x >= VGA_GRAPHICS_WIDTH || y < 0 || y >= VGA_GRAPHICS_HEIGHT) {
+        return;
+    }
+    frame[y * VGA_GRAPHICS_WIDTH + x] = color;
+}
+
+void draw_sprite(
+    int dst_x, int dst_y, int sprite_width, int sprite_height,
+    const uint8_t* sprite) {
+    for (int x = 0; x < sprite_width; x++) {
+        for (int y = 0; y < sprite_height; y++) {
+            uint8_t color = sprite[x * sprite_height + y];
+            if (color != TRANSPARENCY_COLOR) {
+                put_pixel(dst_x + x, dst_y + y, color);
+            }
+        }
+    }
+}
+
+bool font_index_for_char(char ch, int *out_index) {
+    if (ch == ' ') {
+        *out_index = FONT_SPACE_INDEX;
+        return true;
+    }
+    if (ch >= '0' && ch <= '9') {
+        *out_index = FONT_DIGIT_BASE + (ch - '0');
+        return true;
+    }
+    if (ch >= 'A' && ch <= 'Z') {
+        *out_index = FONT_LETTER_BASE + (ch - 'A');
+        return true;
+    }
+    return false;
+}
+
+void draw_hud(const char *text) {
+    // int lines_count = 1;
+    int y0 = HUD_OFFSET;
+    for (const char* line_start = text; *line_start;) {
+        int glyph_count = 0;
+        const char* p = line_start;
+        for (; *p != '\n' && *p != 0; p++) {
+            glyph_count++;
+        }
+        if (glyph_count > 0) {
+            const int text_width = glyph_count * FONT_WIDTH + (glyph_count - 1) * GLYPH_SPACING;
+            int x0 = VGA_GRAPHICS_WIDTH - HUD_OFFSET - text_width;
+            for (const char* q = line_start; q != p; q++) {
+                int glyph_index;
+                check(font_index_for_char(*q, &glyph_index));
+                draw_sprite(x0, y0, FONT_WIDTH, FONT_HEIGHT,
+                    &sprite_data.font[glyph_index].tex[0][0]);
+                x0 += FONT_WIDTH + GLYPH_SPACING;
+            }
+        }
+        if (*p == 0) {
+            break;
+        }
+        line_start = p + 1;
+        y0 += FONT_HEIGHT + GLYPH_SPACING;
+    }
+}
+
+void draw_game_world() {
+    if (!snake.have_game)
+        return;
+
+    for (int tx = 0; tx < WORLD_WIDTH; tx++) {
+        for (int ty = 0; ty < WORLD_HEIGHT; ty++) {
+            tile_t tt = snake.world[tx][ty];
+            if (tt == tile_empty)
+                continue;
+            check((uint8_t)tt < TILE_SPRITES);
+            draw_sprite(TILE_WIDTH * tx, TILE_WIDTH * ty - TILE_HEIGHT_OFFSET,
+                TILE_WIDTH, TILE_HEIGHT, &sprite_data.tile[tt].tex[0][0]);
+        }
+    }
+    if (snake.game_screen != game_screen_gaming) {
+        for (uint32_t pix = 0; pix < FRAME_SIZE; pix++) {
+            frame[pix] = vga_to_gray(frame[pix]);
+        }
+    }
+}
+
+void draw_frame() {
+    clear_frame(0);
+    draw_game_world();
+
+    StringBuilder hud = { 0 };
+    if (snake.game_screen == game_screen_gaming) {
+        StringBuilder_append_u32(&hud, snake.score);
+    } else if (snake.game_screen == game_screen_pause) {
+        if (snake.have_game) {
+            StringBuilder_append_cstr(&hud, "PAUSED");
+        }
+        StringBuilder_append_cstr(&hud, "PRESS 1 FOR NEW GAME");
+        if (snake.have_game) {
+            StringBuilder_append_cstr(&hud, "PRESS 2 TO CONTINUE");
+        }
+        StringBuilder_append_cstr(&hud, "PRESS Q TO QUIT");
+    } else if (snake.game_screen == game_screen_select_map) {
+        StringBuilder_append_cstr(&hud, "SELECT LEVEL\nCURRENTLY SELECTED:\n");
+        check(snake.selected_map_index < PLAYABLE_MAPS_COUNT);
+        StringBuilder_append_cstr(&hud, map_list.maps[snake.selected_map_index].name);
+    } else if (snake.game_screen == game_screen_select_apple_count) {
+        StringBuilder_append_cstr(&hud, "SELECT DIFFICULTY\n"
+            "HOW MANY APPLES ON MAP\nCURRENTLY SELECTED:\n");
+        StringBuilder_append_u32(&hud, snake.gamemode_apples_count);
+    }
+    draw_hud(StringBuilder_get_cstr(&hud));
+}
+
+void wait_until(uint32_t deadline_ms) {
+    while ((int32_t)(time_ms() - deadline_ms) < 0) {
+        syscall(SYS_halt, 0);
+    }
+}
+
+int main(void) {
+    init_snake();
+    syscall(SYS_switch_to_graphics, 0);
+
+    snake.selected_map_index = 3;
+    start_snake_game();
+
+    uint32_t next_frame_ms = time_ms();
+    while (1) {
+        // while (true) {
+        //     int ch = syscall(SYS_getc, 0);
+        //     if (ch < 0)
+        //         break;
+        //     uint8_t keycode = (uint8_t)ch;
+        //
+        // }
+        draw_frame();
+
+        syscall(SYS_swap_frame, (uintptr_t)frame);
+
+        next_frame_ms += 500;
+        wait_until(next_frame_ms);
+    }
+}

snake/sprites.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <stdbool.h>
+#include <stdint.h>
+
+#define TRANSPARENCY_COLOR 47
+
+#define TILE_WIDTH 20
+#define TILE_HEIGHT 32
+#define TILE_HEIGHT_OFFSET 12
+
+typedef struct {
+    uint8_t tex[TILE_WIDTH][TILE_HEIGHT];
+} TileSprite;
+
+#define FONT_WIDTH 12
+#define FONT_HEIGHT 21
+
+typedef struct {
+    uint8_t tex[FONT_WIDTH][FONT_HEIGHT];
+} FontSprite;
+
+#define PUDDLE_WIDTH 40
+
+typedef struct {
+    uint8_t tex[PUDDLE_WIDTH][PUDDLE_WIDTH];
+} PuddleSprite;
+
+#define TILE_SPRITES 50
+#define FONT_SPRITES (1+10+26)
+#define PUDDLE_SPRITES 5
+
+typedef struct {
+    TileSprite tile[TILE_SPRITES];
+    FontSprite font[FONT_SPRITES];
+    PuddleSprite puddle[PUDDLE_SPRITES];
+} SpriteData;
+

user/snake.c

@@ -1,61 +0,0 @@
-#include "../syscall.h"
-#include "../drivers/vga.h"
-#include <stdint.h>
-
-enum {
-    FRAME_SIZE = VGA_GRAPHICS_WIDTH * VGA_GRAPHICS_HEIGHT,
-    BLOCK_WIDTH = 270,
-    BLOCK_HEIGHT = 100,
-    BLOCK_X = 10,
-    BLOCK_Y = 0,
-};
-
-// Non-zero initializer keeps the framebuffer in the program image, which this
-// loader maps more reliably than a large BSS object.
-static uint8_t frame[FRAME_SIZE] = { 1 };
-
-static uint32_t time_ms(void) {
-    return (uint32_t)syscall(SYS_time_ms, 0);
-}
-
-static void clear_frame(uint8_t color) {
-    for (uint32_t i = 0; i < FRAME_SIZE; i++) {
-        frame[i] = color;
-    }
-}
-
-static void put_pixel(int x, int y, uint8_t color) {
-    if (x < 0 || x >= VGA_GRAPHICS_WIDTH || y < 0 || y >= VGA_GRAPHICS_HEIGHT) {
-        return;
-    }
-    frame[y * VGA_GRAPHICS_WIDTH + x] = color;
-}
-
-static void draw_demo(void) {
-    clear_frame(0x01);
-
-    for (int y = 0; y < BLOCK_HEIGHT; y++) {
-        for (int x = 0; x < BLOCK_WIDTH; x++) {
-            int screen_x = BLOCK_X + x;
-            int screen_y = BLOCK_Y + y;
-            uint8_t color = (uint8_t)((x + 2 * y) & 0x3f);
-
-            if (x < 3 || y < 3 || x >= BLOCK_WIDTH - 3 || y >= BLOCK_HEIGHT - 3) {
-                color = 0x3f;
-            }
-            put_pixel(screen_x, screen_y, color);
-        }
-    }
-}
-
-int main(void) {
-    syscall(SYS_switch_to_graphics, 0);
-    draw_demo();
-    syscall(SYS_swap_frame, (uintptr_t)frame);
-
-    uint32_t start = time_ms();
-    while ((uint32_t)(time_ms() - start) < 2000) {
-    }
-
-    return 0;
-}