From fe58fdc2e53a01be94b4dbc845dcdbbdae0a7889 Mon Sep 17 00:00:00 2001
From: nsfisis <nsfisis@gmail.com>
Date: Sat, 15 Jul 2023 13:38:20 +0900
Subject: 7.4

---
 src/main.zig | 34 ++++++++++++++++++++++++++++++++--
 1 file changed, 32 insertions(+), 2 deletions(-)

diff --git a/src/main.zig b/src/main.zig
index 70da3fc..f0da441 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -258,6 +258,29 @@ fn generateEarthScene(allocator: anytype) !Hittable {
     return .{ .list = .{ .objects = hittable_objects } };
 }
 
+fn generateSimpleLightScene(rng: Random, allocator: anytype) !Hittable {
+    var hittable_objects = ArrayList(Hittable).init(allocator);
+
+    const perlin = try Texture.makeNoise(allocator, 4.0, rng);
+    var mat1 = try allocator.create(Material);
+    var mat2 = try allocator.create(Material);
+
+    mat1.* = .{ .diffuse = .{ .albedo = perlin } };
+    mat2.* = .{ .diffuse = .{ .albedo = perlin } };
+
+    try hittable_objects.append(makeSphere(.{ .x = 0, .y = -1000, .z = 0 }, 1000, mat1));
+    try hittable_objects.append(makeSphere(.{ .x = 0, .y = 2, .z = 0 }, 2, mat2));
+
+    const light = Texture.makeSolid(rgb(4, 4, 4));
+    var mat3 = try allocator.create(Material);
+
+    mat3.* = .{ .diffuse_light = .{ .emit = light } };
+
+    try hittable_objects.append(.{ .xyRect = .{ .x0 = 3.0, .x1 = 5.0, .y0 = 1.0, .y1 = 3.0, .k = -2.0, .material = mat3 } });
+
+    return .{ .list = .{ .objects = hittable_objects } };
+}
+
 pub fn main() !void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     const allocator = gpa.allocator();
@@ -270,10 +293,10 @@ pub fn main() !void {
     const aspect_ratio = 3.0 / 2.0;
     const image_width = 600;
     const image_height = @floatToInt(comptime_int, @divTrunc(image_width, aspect_ratio));
-    const samples_per_pixel = 50;
     const max_depth = 50;
+    var samples_per_pixel: u32 = 50;
 
-    const scene = 4;
+    const scene = 5;
 
     // World
     var world: Hittable = undefined;
@@ -308,6 +331,13 @@ pub fn main() !void {
         lookFrom = .{ .x = 13, .y = 2, .z = 3 };
         lookAt = .{ .x = 0, .y = 0, .z = 0 };
         vFov = 20.0;
+    } else if (scene == 5) {
+        world = try generateSimpleLightScene(rng, allocator);
+        background = rgb(0, 0, 0);
+        lookFrom = .{ .x = 26, .y = 3, .z = 6 };
+        lookAt = .{ .x = 0, .y = 2, .z = 0 };
+        vFov = 20.0;
+        samples_per_pixel = 400;
     }
     defer world.deinit(allocator);
 
-- 
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