1 files changed, 113 insertions, 0 deletions
diff --git a/examples/input/ex_input.c b/examples/input/ex_input.c
new file mode 100644
index 0000000..d3d1fbd
--- /dev/null
+++ b/examples/input/ex_input.c
@@ -0,0 +1,113 @@
+#include <glfw3.h>
+
+#include "camera.h"
+#include "core.h"
+#include "input.h"
+#include "keys.h"
+#include "maths.h"
+#include "maths_types.h"
+#include "render.h"
+#include "render_backend.h"
+
+typedef struct game_state {
+  camera camera;
+  vec3 camera_euler;
+  bool first_mouse_update;
+} game_state;
+
+void update_camera_rotation(input_state* input, game_state* game, camera* cam);
+
+int main() {
+  core* core = core_bringup();
+
+  game_state game = {
+    .camera = camera_create(vec3_create(0, 0, 30), vec3_create(0, 0, -1), VEC3_Y, deg_to_rad(45.0)),
+    .camera_euler = vec3_create(90, 0, 0),
+    .first_mouse_update = true,
+  };
+
+  printf("Starting look direction: ");
+  print_vec3(game.camera.front);
+
+  // Main loop
+  const f32 camera_speed = 0.4;
+
+  while (!should_exit(core)) {
+    input_update(&core->input);
+
+    vec3 translation = VEC3_ZERO;
+    if (key_is_pressed(KEYCODE_W) || key_is_pressed(KEYCODE_KEY_UP)) {
+      printf("Move Forwards\n");
+      translation = vec3_mult(game.camera.front, camera_speed);
+    } else if (key_is_pressed(KEYCODE_S) || key_is_pressed(KEYCODE_KEY_DOWN)) {
+      printf("Move Backwards\n");
+      translation = vec3_mult(game.camera.front, -camera_speed);
+    } else if (key_is_pressed(KEYCODE_A) || key_is_pressed(KEYCODE_KEY_LEFT)) {
+      printf("Move Left\n");
+      vec3 lateral = vec3_normalise(vec3_cross(game.camera.front, game.camera.up));
+      translation = vec3_mult(lateral, -camera_speed);
+    } else if (key_is_pressed(KEYCODE_D) || key_is_pressed(KEYCODE_KEY_RIGHT)) {
+      printf("Move Right\n");
+      vec3 lateral = vec3_normalise(vec3_cross(game.camera.front, game.camera.up));
+      translation = vec3_mult(lateral, camera_speed);
+    }
+    game.camera.position = vec3_add(game.camera.position, translation);
+    update_camera_rotation(&core->input, &game, &game.camera);
+
+    // UNUSED: threadpool_process_results(&core->threadpool, 1);
+
+    render_frame_begin(&core->renderer);
+
+    mat4 model = mat4_translation(VEC3_ZERO);
+
+    gfx_backend_draw_frame(&core->renderer, &game.camera, model);
+
+    render_frame_end(&core->renderer);
+  }
+
+  core_shutdown(core);
+
+  return 0;
+}
+
+void update_camera_rotation(input_state* input, game_state* game, camera* cam) {
+  float xoffset = -input->mouse.x_delta;  // xpos - lastX;
+  float yoffset = -input->mouse.y_delta;  // reversed since y-coordinates go from bottom to top
+  if (game->first_mouse_update) {
+    xoffset = 0.0;
+    yoffset = 0.0;
+    game->first_mouse_update = false;
+  }
+
+  printf("x offset: %f y offset %f\n", xoffset, yoffset);
+
+  float sensitivity = 0.1f;  // change this value to your liking
+  xoffset *= sensitivity;
+  yoffset *= sensitivity;
+
+  // x = yaw
+  game->camera_euler.x += xoffset;
+  // y = pitch
+  game->camera_euler.y += yoffset;
+  // we dont update roll
+
+  f32 yaw = game->camera_euler.x;
+  f32 pitch = game->camera_euler.y;
+
+  // make sure that when pitch is out of bounds, screen doesn't get flipped
+  if (game->camera_euler.y > 89.0f) game->camera_euler.y = 89.0f;
+  if (game->camera_euler.y < -89.0f) game->camera_euler.y = -89.0f;
+
+  vec3 front = cam->front;
+  front.x = cos(deg_to_rad(yaw) * cos(deg_to_rad(pitch)));
+  front.y = sin(deg_to_rad(pitch));
+  front.z = sin(deg_to_rad(yaw)) * cos(deg_to_rad(pitch));
+
+  front = vec3_normalise(front);
+  // save it back
+  cam->front.x = front.x;
+  cam->front.y = front.y;
+  // cam->front.z = front.z;
+
+  print_vec3(cam->front);
+}