Add direction to camera

3 files changed, 8 insertions, 2 deletions

diff --git a/src/core/src/loop.c b/src/core/src/loop.c
index 2657e9f..534acce 100644
--- a/src/core/src/loop.c
+++ b/src/core/src/loop.c
@@ -38,6 +38,7 @@ Platform* GLOBAL_PLATFORM = NULL;
 
 static Camera default_camera = {
   .pos = {3, 0, 0},
+  .dir = {1, 1, 1},
 };
 
 input_callback_t* callbacks[128];
diff --git a/src/rendering/include/engine/rendering/rendering.h b/src/rendering/include/engine/rendering/rendering.h
index e1232d5..87de0b2 100644
--- a/src/rendering/include/engine/rendering/rendering.h
+++ b/src/rendering/include/engine/rendering/rendering.h
@@ -72,6 +72,10 @@ typedef enum {
 typedef struct {
   /* Position of the camera in world-space. */
   vec3 pos;
+
+  /* The viewing direction of the camera, relative to the camera. */
+  vec3 dir;
+
   /* Perspective matrix. Initialize with r_perspective_ortho or r_perspective. */
   /* Alternatively, use `glm_perspective` or `glm_ortho`. */
   mat4 per;
diff --git a/src/rendering/src/rendering.c b/src/rendering/src/rendering.c
index 845cd70..aa9306e 100644
--- a/src/rendering/src/rendering.c
+++ b/src/rendering/src/rendering.c
@@ -36,8 +36,9 @@ void render_present(Window* w) {
   const f32 ratio = (float)w->windowsize[0] / (float)w->windowsize[1];
 
   mat4 view; // view
-  vec3 angle = {1, 2.0, 1};
-  glm_vec3_sub(c.pos, angle, angle);
+  vec3 angle; // viewing angle / direction of the camera
+
+  glm_vec3_sub(c.pos, c.dir, angle);
   glm_lookat(c.pos, angle, GLM_YUP, view);
 
   for (i32 i = 0; i < drawcall_len; i++) {