Minor fixes and adjustments

assets/shaders.glsl

@@ -197,7 +197,7 @@ void main() {
     for (int i = 0; i < _DirectionalLightCount; i++) {
         Directional_Light light = _DirectionalLights[i];
 
-        vec3 lightDirectionVS = normalize((_MatrixWStoVS * vec4(light.directionWS, 0.0)).xyz);
+        vec3 lightDirectionVS = normalize((_MatrixWStoVS * vec4(-light.directionWS, 0.0)).xyz);
         vec3 incomingRadiance = light.color;
 
         outgoingRadiance += lightOutgoingRadiance(

src/game.zig

@@ -37,9 +37,12 @@ const camera_vertical_fov_deg = 90.0;
 const camera_half_vertical_fov_rad = 0.5 * camera_vertical_fov_deg * std.math.rad_per_deg;
 const camera_mouse_sensitivity = 0.0015;
 
+const max_point_lights = 100;
+const max_directional_lights = 4;
+
 pub fn init() void {
     point_light_buffer = sg.makeBuffer(.{
-        .size = @sizeOf([4]shaders.PointLight),
+        .size = @sizeOf([max_point_lights]shaders.PointLight),
         .usage = .{
             .stream_update = true,
             .storage_buffer = true,
@@ -50,7 +53,7 @@ pub fn init() void {
     });
 
     directional_light_buffer = sg.makeBuffer(.{
-        .size = @sizeOf([4]shaders.DirectionalLight),
+        .size = @sizeOf([max_directional_lights]shaders.DirectionalLight),
         .usage = .{
             .stream_update = true,
             .storage_buffer = true,
@@ -135,7 +138,7 @@ pub fn update(dt: f32) void {
         0,             0,             0,                 0,
     );
     // zig fmt: on
-    const ambient_light = Vector3.init(0, 0, 0);
+    const ambient_light = Vector3.init(0.3, 0.3, 0.3);
 
     sg.applyUniforms(shaders.UB_Global_Uniforms_Vertex, sg.asRange(&shaders.GlobalUniformsVertex{
         ._MatrixWStoVS = matrix_ws_to_vs.asArray(),
@@ -144,33 +147,45 @@ pub fn update(dt: f32) void {
 
     const point_lights: []const shaders.PointLight = &.{
         .{
-            .positionWS = .{ 0, 0, 1.62 },
-            .color = .{ 11, 11, 10 },
+            .positionWS = .{ 0, 0, 1 },
+            .color = .{ 10, 10, 10 },
         },
         .{
-            .positionWS = .{ -10, 10, 1.62 },
+            .positionWS = .{ -10, 10, 1 },
             .color = .{ 5, 0, 0 },
         },
         .{
-            .positionWS = .{ 0, 10, 1.62 },
+            .positionWS = .{ 10, 10, 1 },
+            .color = .{ 0, 0, 5 },
+        },
+        .{
+            .positionWS = .{ -10, -10, 1 },
             .color = .{ 0, 5, 0 },
         },
         .{
-            .positionWS = .{ 10, 10, 1.62 },
-            .color = .{ 0, 0, 5 },
+            .positionWS = .{ 10, -10, 1 },
+            .color = .{ 5, 5, 0 },
+        },
+    };
+
+    const directional_lights: []const shaders.DirectionalLight = &.{
+        .{
+            .directionWS = .{ 0, 0, -1 },
+            .color = .{ 0.2, 0.2, 0.2 },
         },
     };
 
     sg.updateBuffer(point_light_buffer, sg.asRange(point_lights));
+    sg.updateBuffer(directional_light_buffer, sg.asRange(directional_lights));
 
     sg.applyUniforms(shaders.UB_Global_Uniforms_Fragment, sg.asRange(&shaders.GlobalUniformsFragment{
         ._MatrixWStoVS = matrix_ws_to_vs.asArray(),
         ._AmbientLight = ambient_light.asArray(),
         ._PointLightCount = @intCast(point_lights.len),
-        ._DirectionalLightCount = 0,
+        ._DirectionalLightCount = @intCast(directional_lights.len),
     }));
 
-    var it = Iterator3.init(.init(-10, -10, 0), .init(10, 10, 0), .one);
+    var it = Iterator3.init(.init(-8, -8, 0), .init(8, 8, 0), .one);
     var tile_index: u32 = 0;
     while (it.next()) |pos| : (tile_index = (tile_index + 1) % 16) {
         tiles.draw(pos, .identity, tile_index);

src/math/Iterator3.zig

@@ -28,11 +28,11 @@ pub fn next(self: *@This()) ?Vector3 {
             next_current = next_current.setZ(next_current.getZ() + self.step.getZ());
             if (next_current.getZ() > self.max.getZ()) {
                 self.current = null;
-                return null;
+                return current;
             }
         }
     }
 
     self.current = next_current;
-    return next_current;
+    return current;
 }