raycast start

code/first.c

@@ -9,6 +9,7 @@
 #include "vulkan/core.h"
 
 #include "game/impl/player.c"
+#include "game/impl/aabb.c"
 
 int main(int argc, char **argv)
 {
@@ -34,11 +35,31 @@ int main(int argc, char **argv)
 	Player player;
 	player.pos.x = 0;
 	player.pos.y = 0;
+	AABB a;
+	a.pos.x = 10;
+	a.pos.y = 10;
+	a.size.x = 10;
+	a.size.y = 10;
 	while (running)
 	{
 		SDL_Event e;
 		while (SDL_PollEvent(&e))
 		{
+			SDL_MouseButtonEvent mouseBtn = e.button;
+			if (mouseBtn.clicks == 1)
+			{
+				V2f point;
+				point.x = mouseBtn.x;
+				point.y = mouseBtn.y;
+				if (AABB_Slab(player.pos, point, a))
+				{
+					printf("hit");
+				}
+				else
+				{
+					printf("miss");
+				}
+			}
 			PlayerUpdate(&e, &player);
 			if (e.type == SDL_EVENT_QUIT)
 			{

code/game/aabb.h

@@ -1,17 +1,16 @@
 #if !defined(LD_GAME_AABB_H_)
 #define LD_GAME_AABB_H_
-#include "types.h"
+#include "../core/types.h"
 #include "../core/macros.h"
 
-
 typedef struct AABB AABB;
-struct AABB {
+struct AABB
+{
   V2f pos;
   V2f size;
 };
 
-
 function bool AABB_Collide(AABB a, AABB b);
 function bool AABB_Point(AABB a, V2f v);
-
+function bool AABB_Slab(V2f origin, V2f point, AABB a);
-#endif  // LD_GAME_AABB_H_
+#endif // LD_GAME_AABB_H_

code/game/impl/aabb.c

@@ -1,15 +1,36 @@
+#include "math.h"
 #include "../aabb.h"
-#include "../types.h"
+#include "../../core/types.h"
 
-bool AABB_Collide(AABB a, AABB b) {
+bool AABB_Collide(AABB a, AABB b)
+{
   bool collision_x = a.pos.x + a.size.x >= b.pos.x && b.pos.x + b.size.x >= a.pos.x;
   bool collision_y = a.pos.y + a.size.x >= b.pos.y && b.pos.y + b.size.y >= a.pos.y;
   return collision_x && collision_y;
 }
 
-bool AABB_Point(AABB a, V2f v) {
+bool AABB_Point(AABB a, V2f v)
+{
   bool collision_x = a.pos.x + a.size.x >= v.x && a.pos.x <= v.x;
   bool collision_y = a.pos.x + a.size.y >= v.y && a.pos.y <= v.y;
   return collision_x && collision_y;
 }
 
+bool AABB_Slab(V2f origin, V2f point, AABB a)
+{
+  V2f start = a.pos;
+  V2f finish = {a.pos.x + a.size.x, a.pos.y + a.size.y};
+  V2f direction = {origin.x - point.x, origin.y - point.y};
+  // x
+  F32 tLow = (start.x - origin.x) / direction.x;
+  F32 tHigh = (finish.x - origin.x) / direction.x;
+  F32 tMin = min(tLow, tHigh);
+  F32 tMax = max(tLow, tHigh);
+  // y
+  tLow = (start.x - origin.x) / direction.x;
+  tHigh = (finish.x - origin.x) / direction.x;
+
+  tMin = max(tMin, min(tLow, tHigh));
+  tMax = min(tMax, max(tLow, tHigh));
+  return tMax >= max(0.0, tMin);
+}

code/game/impl/player.c

@@ -3,6 +3,7 @@
 void PlayerUpdate(SDL_Event *event, Player *player)
 {
     SDL_KeyboardEvent key = event->key;
+    SDL_MouseButtonEvent mouseBtn = event->button;
     if (key.key == SDLK_W)
     {
         player->pos.y += 10;
@@ -19,4 +20,9 @@ void PlayerUpdate(SDL_Event *event, Player *player)
     {
         player->pos.y -= 10;
     }
+    if (mouseBtn.clicks == 1)
+    {
+        // shooting
+        player->bulletsLoaded -= 1;
+    }
 }

code/game/player.h

@@ -6,6 +6,7 @@ typedef struct Player Player;
 struct Player
 {
     V2f pos;
+    U32 bulletsLoaded;
 };
 
 function void PlayerUpdate(SDL_Event *event, Player *player);