feat: preview

Makefile

@@ -2,13 +2,13 @@ CFLAGS := -ggdb -Wall -Wextra
 # -fsanitize=address
 LDFLAGS = -lglfw -lm -lGL -I./glad/include
 
-SOURCES = main.c game.c game.h glad/src/glad.c assets/dominos.h domino.c domino.h
+SOURCES = main.c game.c game.h glad/src/glad.c assets/white_and_blue_dominoes.h assets/red_and_peach_dominoes.h domino.c domino.h
 
 domino-dungeon: ${SOURCES}
 	$(CC) ${CFLAGS} -o $@ $^ ${LDFLAGS} 
 
-assets/dominos.h: src_build/domino_assets
-	$< assets/1bit_dominoes_asset_pack/white_and_blue_dominoes.png > $@
+assets/%.h: src_build/domino_assets
+	$< assets/1bit_dominoes_asset_pack/$*.png $* > $@
 
 src_build/domino_assets: src_build/domino_assets.c
 	$(CC) -o $@ $^ -lm

game.c

@@ -5,7 +5,8 @@
 
 #include "game.h"
 #include "domino.h"
-#include "assets/dominos.h"
+#include "assets/white_and_blue_dominoes.h"
+#include "assets/red_and_peach_dominoes.h"
 
 #define MIN(a,b) (((a)<(b))?(a):(b))
 #define MAX(a,b) (((a)>(b))?(a):(b))
@@ -21,6 +22,13 @@ size_t hand_count = 0;
 struct brick active = {0};
 int has_active = 0;
 
+struct eye direction[4] = {
+  {.x =  0, .y = -1},
+  {.x = -2, .y =  0},
+  {.x =  1, .y =  0},
+  {.x =  0, .y =  1},
+};
+
 void key_callback(int key, int scancode, int action, int mods) {
   if (action != GLFW_PRESS) return;
   switch (key) {
@@ -58,8 +66,10 @@ void mouse_button_callback(int button, int action, int mods) {
 
   printf("click!\n");
   if (button == GLFW_MOUSE_BUTTON_LEFT && action == GLFW_RELEASE) {
-    has_active = 0;
-    hand[hand_count++] = active;
+    if (has_active) {
+      has_active = 0;
+      hand[hand_count++] = active;
+    }
   }
 
 }
@@ -113,7 +123,39 @@ void render(struct image canvas) {
   // domino playground
   for (size_t i = 0; i < bricks.count; i++) {
     struct brick *b = &bricks.items.brick[i];
-    draw(canvas, domino[b->back.val][b->front.val], b->front.x * EYE_SIZE, b->front.y * EYE_SIZE);
+    draw(canvas, red_and_peach_dominoes[b->back.val][b->front.val], b->front.x * EYE_SIZE, b->front.y * EYE_SIZE);
+  }
+
+  if (has_active) {
+    for (size_t i = 0; i < bricks.count * 2; i++) {
+      struct eye e = bricks.items.eye[i];
+      if (e.val != active.front.val) continue;
+
+      struct brick p = active;
+      p.front.x = e.x;
+      p.front.y = e.y;
+      p.back.x = e.x + 1;
+      p.back.y = e.y;
+      struct brick previews[4] = {p, p, p, p};
+      for (size_t ii = 0; ii < 4; ii++) {
+        previews[ii].front.x += direction[ii].x;
+        previews[ii].front.y += direction[ii].y;
+        previews[ii].front.val = 0;
+
+        previews[ii].back.x += direction[ii].x;
+        previews[ii].back.y += direction[ii].y;
+
+        for (size_t iii = 0; iii < bricks.count * 2; iii++) {
+          previews[ii].front.val |= ((bricks.items.eye[iii].x == previews[ii].back.x && bricks.items.eye[iii].y == previews[ii].back.y) ||
+              (bricks.items.eye[iii].x == previews[ii].front.x && bricks.items.eye[iii].y == previews[ii].front.y));
+        }
+      }
+
+      for (size_t ii = 0; ii < 4; ii++) {
+        if (!previews[ii].front.val)
+          draw(canvas, white_and_blue_dominoes[active.back.val][active.front.val], previews[ii].front.x * EYE_SIZE, previews[ii].front.y * EYE_SIZE);
+      }
+    }
   }
 
   // hand
@@ -121,12 +163,12 @@ void render(struct image canvas) {
     struct brick *b = &hand[i];
     b->front.x = (canvas.width - hand_count *(DOMINO_WIDTH + 4))/2 + i * (DOMINO_WIDTH + 4);
     b->front.y = canvas.height - DOMINO_WIDTH;
-    draw(canvas, domino[b->back.val][b->front.val], b->front.x, b->front.y);
+    draw(canvas, red_and_peach_dominoes[b->back.val][b->front.val], b->front.x, b->front.y);
   }
 
   // active
   if (has_active) {
-    draw(canvas,domino[active.back.val][active.front.val], CLAMP(mouse_x + active.front.x, 0, canvas.width), CLAMP(mouse_y + active.front.y, 0, canvas.height));
+    draw(canvas, red_and_peach_dominoes[active.back.val][active.front.val], CLAMP(mouse_x + active.front.x, 0, canvas.width), CLAMP(mouse_y + active.front.y, 0, canvas.height));
   }
 }
 

src_build/domino_assets.c

@@ -33,7 +33,7 @@ void print_domino(unsigned char *data, int width, int n, int posx, int posy) {
 
 int main(int argc, char **argv) {
   int x,y,n;
-  if (argc != 2) return 1;
+  if (argc != 3) return 1;
 
   unsigned char *data = stbi_load(argv[1], &x, &y, &n, 0);
   // n = n < 3 ? n : 3;
@@ -47,7 +47,8 @@ int main(int argc, char **argv) {
   printf("#define EYE_SIZE         %d\n", EYE_SIZE);
   printf("#define BYTES_PER_PIXEL  %d\n", n);
 
-  printf("struct image domino[%d][%d] = {\n",
+  printf("struct image %s[%d][%d] = {\n",
+      argv[2],
       NUM_DOMINO_X,
       NUM_DOMINO_Y
       );