From c4073d7d91a68f1591027e580b2083c5abb72020 Mon Sep 17 00:00:00 2001
From: Daniel Bross <daniel@brossferatu.com>
Date: Wed, 4 Dec 2024 23:41:52 +0100
Subject: [PATCH] Point lights

---
 core/scene.jai              |  3 ++-
 core/transform.jai          | 12 +++++++----
 module.jai                  |  6 ++++++
 renderer/engine_buffers.jai |  9 ++++++++
 renderer/point_light.jai    | 41 +++++++++++++++++++++++++++++++++++++
 5 files changed, 66 insertions(+), 5 deletions(-)
 create mode 100644 renderer/point_light.jai

diff --git a/core/scene.jai b/core/scene.jai
index cc3bc69..5758948 100644
--- a/core/scene.jai
+++ b/core/scene.jai
@@ -1,4 +1,5 @@
 #load "../renderer/directional_light.jai";
+#load "../renderer/point_light.jai";
 #load "particles.jai";
 
 MAX_CACHED_PILES :: 8;
@@ -160,7 +161,7 @@ create_scene :: (name: string = "", max_entities: s64 = 256) -> *Scene {
 
     array_reserve(*scene.entities, max_entities);
 
-    scene.directional_light.color_and_intensity = .{1,1,1,2};
+    scene.directional_light.color_and_intensity = .{1,1,1,1};
     scene.directional_light.direction = to_v4(normalize(Vector3.{0.2, -0.7, 0.4}));
 
     dir_light_data : Directional_Light_Buffer_Data;
diff --git a/core/transform.jai b/core/transform.jai
index 8912761..932538f 100644
--- a/core/transform.jai
+++ b/core/transform.jai
@@ -72,7 +72,7 @@ translate :: (transform: *Transform, translation: Vector3, calculate_matrix: boo
 }
 
 euler_to_quaternion :: (value: Vector3) -> Quaternion {
-    return euler_to_quaternion(value.x, value.y, value.z);
+    return euler_to_quaternion(value.y, value.x, value.z);
 }
 
 euler_to_quaternion :: (yaw: float, pitch: float, roll: float) -> Quaternion {
@@ -102,8 +102,8 @@ quaternion_to_euler_v3 :: (q: Quaternion) -> Vector3 {
     yaw, pitch, roll := quaternion_to_euler(q);
 
     v : Vector3 = ---;
-    v.x = yaw;
-    v.y = pitch;
+    v.x = pitch;
+    v.y = yaw;
     v.z = roll;
 
     return v;
@@ -130,7 +130,7 @@ quaternion_to_euler :: (q: Quaternion) -> yaw: float, pitch: float, roll: float
     cosy_cosp := 1.0 - 2.0 * (q.y * q.y + q.z * q.z);
     yaw = atan2(siny_cosp, cosy_cosp);
 
-    return yaw, pitch, roll;
+    return pitch, yaw, roll;
 }
 
 set_rotation :: (e: *Entity, orientation: Quaternion, calculate_matrix: bool = true) {
@@ -148,6 +148,10 @@ set_rotation :: (transform: *Transform, euler_angles: Vector3, calculate_matrix:
     if calculate_matrix update_matrix(transform);
 }
 
+set_rotation :: (e: *Entity, euler_angles: Vector3, calculate_matrix: bool = true) {
+    set_rotation(*e.transform, euler_angles, calculate_matrix);
+}
+
 set_scale :: (e: *Entity, scale: Vector3, calculate_matrix: bool = true) {
     set_scale(*e.transform, scale, calculate_matrix);
 }
diff --git a/module.jai b/module.jai
index cdf7050..2161f0b 100644
--- a/module.jai
+++ b/module.jai
@@ -32,6 +32,7 @@ Engine_Core :: struct {
     time_buffer : Buffer_Handle;
     screen_data_buffer : Buffer_Handle;
     directional_light_buffer : Buffer_Handle;
+    point_light_buffer : Buffer_Handle;
 
     procs: struct {
        on_scene_loaded: (*Scene, Engine_Mode);
@@ -41,6 +42,9 @@ Engine_Core :: struct {
     }
 
     paused: bool;
+
+    time: float;
+    dt: float;
 }
 
 engine: Engine_Core;
@@ -94,6 +98,8 @@ coven_run :: (game_update_proc: (float), game_update_post_physics_proc: (float))
         now : float = xx seconds_since_init();
         dt = now - time;
         time = now;
+        engine.time = time;
+        engine.dt = dt;
 
         update_fps_counter(dt);
 
diff --git a/renderer/engine_buffers.jai b/renderer/engine_buffers.jai
index 0347bc1..0406ab4 100644
--- a/renderer/engine_buffers.jai
+++ b/renderer/engine_buffers.jai
@@ -61,6 +61,15 @@ update_light_buffer :: () {
     light_data.light_matrix = light_matrix;
 
     upload_data_to_buffer(engine.renderer, engine.directional_light_buffer, *light_data, size_of(Directional_Light_Buffer_Data));
+
+    point_light_array: Point_Light_Array;
+    for light: engine.current_scene.by_type._Point_Light {
+        shd_point_light := to_shader_point_light(light);
+        point_light_array.point_lights[point_light_array.num_point_lights] = shd_point_light;
+        point_light_array.num_point_lights += 1;
+    }
+
+    upload_data_to_buffer(engine.renderer, engine.point_light_buffer, *point_light_array, size_of(Point_Light_Array));
 }
 
 sync_engine_buffers :: () { 
diff --git a/renderer/point_light.jai b/renderer/point_light.jai
new file mode 100644
index 0000000..5019f69
--- /dev/null
+++ b/renderer/point_light.jai
@@ -0,0 +1,41 @@
+Point_Light :: struct {
+    using #as entity : Entity;
+    entity.type = Point_Light;
+
+    color: Vector3;
+    intensity: float = 1.0;
+    attenuation_radius: float = 3.0;
+}
+
+Point_Light_Shader_Data :: struct {
+    position: Vector4;
+    color: Vector4;
+    attenuation_radius: float;
+
+    pad: Vector3;
+}
+
+MAX_POINT_LIGHTS :: 64;
+
+Point_Light_Array :: struct {
+    point_lights: [MAX_POINT_LIGHTS] Point_Light_Shader_Data;
+    num_point_lights: s32;
+    
+    padding: Vector3;
+}
+
+init_entity :: (light: *Point_Light) {
+    light.intensity = 1.0;
+    light.color = .{1,1,1};
+    light.attenuation_radius = 3.0;
+}
+
+to_shader_point_light :: (point_light: *Point_Light) -> Point_Light_Shader_Data {
+    data : Point_Light_Shader_Data;
+
+    data.position = to_v4(get_position(point_light.transform));
+    data.color = to_v4(point_light.color*point_light.intensity);
+    data.attenuation_radius = point_light.attenuation_radius;
+
+    return data;
+}
\ No newline at end of file