diff --git a/assets/models/cornell_box.mtl b/assets/models/cornell_box.mtl
deleted file mode 100644
index d3a1c7a..0000000
--- a/assets/models/cornell_box.mtl
+++ /dev/null
@@ -1,24 +0,0 @@
-newmtl white
-Ka 0 0 0
-Kd 1 1 1
-Ks 0 0 0
-
-newmtl red
-Ka 0 0 0
-Kd 1 0 0
-Ks 0 0 0
-
-newmtl green
-Ka 0 0 0
-Kd 0 1 0
-Ks 0 0 0
-
-newmtl blue
-Ka 0 0 0
-Kd 0 0 1
-Ks 0 0 0
-
-newmtl light
-Ka 20 20 20
-Kd 1 1 1
-Ks 0 0 0
diff --git a/assets/models/cornell_box.obj b/assets/models/cornell_box.obj
deleted file mode 100644
index 43e021f..0000000
--- a/assets/models/cornell_box.obj
+++ /dev/null
@@ -1,145 +0,0 @@
-# cornell_box.obj and cornell_box.mtl are grabbed from Intel's embree project.
-# original cornell box data
-  # comment
-
-# empty line including some space
-   
-
-mtllib cornell_box.mtl
-
-o floor
-usemtl white
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-v 0.0   0.0   0.0
-v 0.0   0.0 559.2
-v 549.6 0.0 559.2
-
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-v 290.0 0.0 114.0
-
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-v 265.0 0.0 296.0
-v 314.0 0.0 456.0
-v 472.0 0.0 406.0
-
-f 1 2 3 4 
-f 8 7 6 5
-f 12 11 10 9
-
-o light
-usemtl light
-v 343.0 548.0 227.0
-v 343.0 548.0 332.0
-v 213.0 548.0 332.0
-v 213.0 548.0 227.0
-f -4 -3 -2 -1
-
-o ceiling
-usemtl white
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-v 556.0 548.8 559.2
-v 0.0 548.8 559.2
-v 0.0 548.8 0.0
-f -4 -3 -2 -1
-
-o back_wall
-usemtl white
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-v 0.0   0.0 559.2
-v 0.0 548.8 559.2
-v 556.0 548.8 559.2
-f -4 -3 -2 -1
-
-o front_wall
-usemtl blue
-v 549.6   0.0 0
-v 0.0   0.0 0
-v 0.0 548.8 0
-v 556.0 548.8 0
-#f -1 -2 -3 -4
-
-o green_wall
-usemtl green
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-v    0.0   0.0   0.0
-v    0.0 548.8   0.0
-v    0.0 548.8 559.2
-f -4 -3 -2 -1
-
-o red_wall
-usemtl red
-v    552.8   0.0   0.0
-v    549.6   0.0 559.2
-v    556.0 548.8 559.2
-v    556.0 548.8   0.0
-f -4 -3 -2 -1
-
-o short_block
-usemtl white
-
-v    130.0 165.0  65.0
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-f -4 -3 -2 -1
-
-v    290.0   0.0 114.0
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-v    240.0   0.0 272.0
-f -4 -3 -2 -1
-
-v    130.0   0.0  65.0
-v    130.0 165.0  65.0
-v    290.0 165.0 114.0
-v    290.0   0.0 114.0
-f -4 -3 -2 -1
-
-v     82.0   0.0 225.0
-v     82.0 165.0 225.0
-v    130.0 165.0  65.0
-v    130.0   0.0  65.0
-f -4 -3 -2 -1
-
-v    240.0   0.0 272.0
-v    240.0 165.0 272.0
-v     82.0 165.0 225.0
-v     82.0   0.0 225.0
-f -4 -3 -2 -1
-
-o tall_block
-usemtl white
-
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-v    265.0 330.0 296.0
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-v    472.0 330.0 406.0
-f -4 -3 -2 -1
-
-usemtl white
-v    423.0   0.0 247.0
-v    423.0 330.0 247.0
-v    472.0 330.0 406.0
-v    472.0   0.0 406.0
-f -4 -3 -2 -1
-
-v    472.0   0.0 406.0
-v    472.0 330.0 406.0
-v    314.0 330.0 456.0
-v    314.0   0.0 456.0
-f -4 -3 -2 -1
-
-v    314.0   0.0 456.0
-v    314.0 330.0 456.0
-v    265.0 330.0 296.0
-v    265.0   0.0 296.0
-f -4 -3 -2 -1
-
-v    265.0   0.0 296.0
-v    265.0 330.0 296.0
-v    423.0 330.0 247.0
-v    423.0   0.0 247.0
-f -4 -3 -2 -1
-
diff --git a/assets/models/tescoPiwo.mtl b/assets/models/tescoPiwo.mtl
new file mode 100644
index 0000000..1c58cf2
--- /dev/null
+++ b/assets/models/tescoPiwo.mtl
@@ -0,0 +1,13 @@
+# Blender 4.2.0 MTL File: 'tescoPiwo.blend'
+# www.blender.org
+
+newmtl Material.001
+Ns 360.000000
+Ka 0.500000 0.500000 0.500000
+Ks 0.500000 0.500000 0.500000
+Ke 0.000000 0.000000 0.000000
+Ni 1.500000
+d 1.000000
+illum 3
+map_Kd tescoPiwoTexture.png
+map_Bump -bm 1.000000 /home/przmk/Downloads/Downloads/tescoPiwoNormal.png
diff --git a/assets/models/tescoPiwo.obj b/assets/models/tescoPiwo.obj
new file mode 100644
index 0000000..92a9452
--- /dev/null
+++ b/assets/models/tescoPiwo.obj
@@ -0,0 +1,1751 @@
+# Blender 4.2.0
+# www.blender.org
+mtllib tescoPiwo.mtl
+o Piwo
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+f 417/367/324 418/368/324 419/369/324 420/370/324 421/371/324 422/372/324 423/373/324 424/374/324 425/375/324 426/376/324 427/377/324 428/378/324 429/379/324 430/380/324 431/381/324 432/382/324 433/383/324 434/384/324 435/385/324 436/386/324 437/387/324 438/388/324 439/389/324 440/390/324 441/391/324 442/392/324 443/393/324 444/394/324 445/395/324 446/396/324 447/397/324 448/398/324
+f 296/316/325 297/315/326 425/399/326 424/400/325
+f 310/268/199 311/365/327 439/401/327 438/269/199
+f 297/315/326 298/308/328 426/402/328 425/399/326
+f 311/365/327 312/312/329 440/403/329 439/401/327
+f 298/308/328 299/307/330 427/404/330 426/402/328
+f 312/312/329 313/311/331 441/405/331 440/403/329
+f 299/307/330 300/363/332 428/406/332 427/404/330
+f 313/311/331 314/361/333 442/407/333 441/405/331
+f 300/363/332 301/359/334 429/408/334 428/406/332
+f 314/361/333 315/357/335 443/409/335 442/407/333
+f 301/359/334 302/355/336 430/410/336 429/408/334
+f 315/357/335 316/353/337 444/411/337 443/409/335
+f 302/355/336 303/349/338 431/412/338 430/410/336
+f 289/351/339 290/347/340 418/413/340 417/414/339
+f 316/353/337 317/300/341 445/415/341 444/411/337
+f 303/349/338 304/344/342 432/416/342 431/412/338
+f 290/347/340 291/342/343 419/417/343 418/413/340
+f 317/300/341 318/299/344 446/418/344 445/415/341
+f 304/344/342 305/340/345 433/419/345 432/416/342
+f 291/342/343 292/338/346 420/420/346 419/417/343
+f 318/299/344 319/336/347 447/421/347 446/418/344
+f 305/340/345 306/334/348 434/422/348 433/419/345
+f 292/338/346 293/332/349 421/423/349 420/420/346
+f 319/336/347 320/328/350 448/424/350 447/421/347
+f 306/334/348 307/330/351 435/425/351 434/422/348
+f 293/332/349 294/324/352 422/426/352 421/423/349
+f 320/328/350 289/327/339 417/427/339 448/424/350
+f 307/330/351 308/366/353 436/428/353 435/425/351
+f 294/324/352 295/320/354 423/429/354 422/426/352
+f 308/366/353 309/267/198 437/270/198 436/428/353
+f 295/320/354 296/316/325 424/400/325 423/429/354
+f 449/430/163 450/431/163 480/432/163 479/433/163 478/434/163 477/435/163 476/436/163 475/437/163 474/438/163 473/439/163 472/440/163 471/441/163 470/442/163 469/443/163 468/444/163 467/445/163 466/446/163 465/447/163 464/448/163 463/449/163 462/450/163 461/451/163 460/452/163 459/453/163 458/454/163 457/455/163 456/456/163 455/457/163 454/458/163 453/459/163 452/460/163 451/461/163
+f 232/204/16 231/203/14 455/203/14 456/204/16
+f 246/205/44 245/107/42 469/107/42 470/205/44
+f 233/206/18 232/204/16 456/204/16 457/206/18
+f 247/207/46 246/205/44 470/205/44 471/207/46
+f 234/208/20 233/206/18 457/206/18 458/208/20
+f 248/209/48 247/207/46 471/207/46 472/209/48
+f 235/210/22 234/208/20 458/208/20 459/210/22
+f 249/211/50 248/209/48 472/209/48 473/211/50
+f 236/212/24 235/210/22 459/210/22 460/212/24
+f 250/213/52 249/211/50 473/211/50 474/213/52
+f 237/214/26 236/212/24 460/212/24 461/214/26
+f 251/215/54 250/213/52 474/213/52 475/215/54
+f 238/216/28 237/214/26 461/214/26 462/216/28
+f 252/217/56 251/215/54 475/215/54 476/217/56
+f 239/218/30 238/216/28 462/216/28 463/218/30
+f 225/220/4 226/219/1 450/219/1 449/220/4
+f 253/221/58 252/217/56 476/217/56 477/221/58
+f 240/222/32 239/218/30 463/218/30 464/222/32
+f 227/223/6 225/220/4 449/220/4 451/223/6
+f 254/224/60 253/221/58 477/221/58 478/224/60
+f 241/225/34 240/222/32 464/222/32 465/225/34
+f 228/226/8 227/223/6 451/223/6 452/226/8
+f 255/227/62 254/224/60 478/224/60 479/227/62
+f 242/228/36 241/225/34 465/225/34 466/228/36
+f 229/229/10 228/226/8 452/226/8 453/229/10
+f 256/230/66 255/227/62 479/227/62 480/230/66
+f 243/231/38 242/228/36 466/228/36 467/231/38
+f 230/232/12 229/229/10 453/229/10 454/232/12
+f 226/233/1 256/230/66 480/230/66 450/233/1
+f 244/106/40 243/231/38 467/231/38 468/106/40
+f 231/203/14 230/232/12 454/232/12 455/203/14
diff --git a/assets/textures/tescoPiwoNormal.png b/assets/textures/tescoPiwoNormal.png
new file mode 100644
index 0000000..1192b94
Binary files /dev/null and b/assets/textures/tescoPiwoNormal.png differ
diff --git a/assets/textures/tescoPiwoTexture.png b/assets/textures/tescoPiwoTexture.png
new file mode 100644
index 0000000..fa252f1
Binary files /dev/null and b/assets/textures/tescoPiwoTexture.png differ
diff --git a/build.zig b/build.zig
index 0a72756..2090664 100644
--- a/build.zig
+++ b/build.zig
@@ -1,6 +1,6 @@
 const std = @import("std");
-const sdl = @import("libs/sdl/build.zig");
-const vkgen = @import("vulkan_zig");
+const sdl = @import("sdl");
+const vkgen = @import("vulkan");
 
 pub fn build(b: *std.Build) void {
     const target = b.standardTargetOptions(.{});
@@ -20,7 +20,7 @@ pub fn build(b: *std.Build) void {
     // --- Dependencies ---
 
     // Vulkan
-    const vkzig_dep = b.dependency("vulkan_zig", .{
+    const vkzig_dep = b.dependency("vulkan", .{
         .registry = @as([]const u8, b.pathFromRoot("./vk.xml")),
     });
     const vkzig_bindings = vkzig_dep.module("vulkan-zig");
@@ -28,15 +28,18 @@ pub fn build(b: *std.Build) void {
 
     const shader_comp = vkgen.ShaderCompileStep.create(
         b,
-        &[_][]const u8{ "glslc", "--target-env=vulkan1.3" },
+        .{ .real_path = "glslc" },
+        &[_][]const u8{"--target-env=vulkan1.3"},
         "-o",
     );
     shader_comp.add("shader_frag", "src/shaders/shader.frag", .{});
     shader_comp.add("shader_vert", "src/shaders/shader.vert", .{});
+    shader_comp.add("second_frag", "src/shaders/second.frag", .{});
+    shader_comp.add("second_vert", "src/shaders/second.vert", .{});
     exe.root_module.addImport("shaders", shader_comp.getModule());
 
     // SDL2
-    const sdl_sdk = sdl.init(b, null, null);
+    const sdl_sdk = sdl.init(b, .{});
     sdl_sdk.link(exe, .dynamic, sdl.Library.SDL2);
     exe.root_module.addImport("sdl2", sdl_sdk.getWrapperModuleVulkan(vkzig_bindings));
 
diff --git a/build.zig.zon b/build.zig.zon
index bf20cb5..bd0d9d0 100644
--- a/build.zig.zon
+++ b/build.zig.zon
@@ -6,9 +6,10 @@
     .dependencies = .{
         .zmath = .{ .path = "libs/zmath" },
         .zstbi = .{ .path = "libs/zstbi" },
-        .vulkan_zig = .{
-            .url = "https://github.com/Snektron/vulkan-zig/archive/9f6e6177b1fdb3ed22231d9216a24480e84cfa5e.tar.gz",
-            .hash = "1220f2961df224f7d35dee774b26194b8b937cc252fa8e4023407776c58521d53e38",
+        .sdl = .{ .path = "libs/sdl" },
+        .vulkan = .{
+            .url = "https://github.com/Snektron/vulkan-zig/archive/f7b21d034f527765f62935de1b62855033621989.tar.gz",
+            .hash = "12201e484e173e70634e664864763223427703e677f28c63ebec9332513c8ca5121c",
         },
         .obj = .{
             .url = "https://github.com/chip2n/zig-obj/archive/58f524ed6834790b29ac1e97b2f9e6b7de7b5346.tar.gz",
diff --git a/libs/sdl b/libs/sdl
index 9663dc7..172a84e 160000
--- a/libs/sdl
+++ b/libs/sdl
@@ -1 +1 @@
-Subproject commit 9663dc70c19b13afcb4b9f596c928d7b2838e548
+Subproject commit 172a84e7b5ce7d4891b8b970c68f4532f96aa7e9
diff --git a/libs/zmath/src/zmath.zig b/libs/zmath/src/zmath.zig
index e38eebf..782a3d1 100644
--- a/libs/zmath/src/zmath.zig
+++ b/libs/zmath/src/zmath.zig
@@ -329,7 +329,7 @@ pub inline fn boolx16(
 // zig fmt: on
 
 pub inline fn veclen(comptime T: type) comptime_int {
-    return @typeInfo(T).Vector.len;
+    return @typeInfo(T).vector.len;
 }
 
 pub inline fn splat(comptime T: type, value: f32) T {
@@ -413,14 +413,14 @@ pub inline fn storeArr4(arr: *[4]f32, v: F32x4) void {
 }
 
 pub inline fn arr3Ptr(ptr: anytype) *const [3]f32 {
-    comptime assert(@typeInfo(@TypeOf(ptr)) == .Pointer);
+    comptime assert(@typeInfo(@TypeOf(ptr)) == .pointer);
     const T = std.meta.Child(@TypeOf(ptr));
     comptime assert(T == F32x4);
     return @as(*const [3]f32, @ptrCast(ptr));
 }
 
 pub inline fn arrNPtr(ptr: anytype) [*]const f32 {
-    comptime assert(@typeInfo(@TypeOf(ptr)) == .Pointer);
+    comptime assert(@typeInfo(@TypeOf(ptr)) == .pointer);
     const T = std.meta.Child(@TypeOf(ptr));
     comptime assert(T == Mat or T == F32x4 or T == F32x8 or T == F32x16);
     return @as([*]const f32, @ptrCast(ptr));
diff --git a/src/main.zig b/src/main.zig
index 5937000..9855338 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -71,7 +71,7 @@ pub fn main() !void {
     var angle: f32 = 0.0;
     const move_speed: f32 = 1000;
 
-    const model_handle = try vulkan_renderer.createMeshModel("teapot.obj");
+    const model_handle = try vulkan_renderer.createMeshModel("tescoPiwo.obj");
 
     mainLoop: while (true) {
         while (sdl.pollEvent()) |ev| {
diff --git a/src/shaders/second.frag b/src/shaders/second.frag
new file mode 100644
index 0000000..7c98a5c
--- /dev/null
+++ b/src/shaders/second.frag
@@ -0,0 +1,22 @@
+#version 450
+
+// Colour output from subpass 1
+layout(input_attachment_index = 0, binding = 0) uniform subpassInput inputColour;
+// Depth output from subpass 1
+layout(input_attachment_index = 1, binding = 1) uniform subpassInput inputDepth;
+
+layout(location = 0) out vec4 colour;
+
+void main() {
+    int xHalf = 800 / 2; 
+    if (gl_FragCoord.x > xHalf) {
+        float lowerBound = 0.98;
+        float upperBound = 1;
+
+        float depth = subpassLoad(inputDepth).r;
+        float depthColourScaled = 1.0f - ((depth - lowerBound) / (upperBound - lowerBound));
+        colour  = vec4(subpassLoad(inputColour).rgb * depthColourScaled, 1.0f);
+    } else {
+        colour = subpassLoad(inputColour).rgba;
+    }
+}
diff --git a/src/shaders/second.vert b/src/shaders/second.vert
new file mode 100644
index 0000000..e9b3199
--- /dev/null
+++ b/src/shaders/second.vert
@@ -0,0 +1,12 @@
+#version 450
+
+// Array for triangle that fills screen
+vec2 positions[3] = vec2[](
+    vec2(3.0, -1.0),
+    vec2(-1.0, -1.0),
+    vec2(-1.0, 3.0)
+);
+
+void main() {
+    gl_Position = vec4(positions[gl_VertexIndex], 0.0, 1.0);
+}
diff --git a/src/vulkan_renderer.zig b/src/vulkan_renderer.zig
index f58728a..75eabd9 100644
--- a/src/vulkan_renderer.zig
+++ b/src/vulkan_renderer.zig
@@ -82,19 +82,26 @@ pub const VulkanRenderer = struct {
     swapchain_framebuffers: []vk.Framebuffer,
     command_buffers: []CommandBuffer,
 
-    depth_buffer_image: vk.Image,
-    depth_buffer_image_memory: vk.DeviceMemory,
-    depth_buffer_image_view: vk.ImageView,
+    depth_buffer_image: []vk.Image,
+    depth_buffer_image_memory: []vk.DeviceMemory,
+    depth_buffer_image_view: []vk.ImageView,
+
+    colour_buffer_image: []vk.Image,
+    colour_buffer_image_memory: []vk.DeviceMemory,
+    colour_buffer_image_view: []vk.ImageView,
 
     // Descriptors
     descriptor_set_layout: vk.DescriptorSetLayout,
     sampler_set_layout: vk.DescriptorSetLayout,
+    input_set_layout: vk.DescriptorSetLayout,
     push_constant_range: vk.PushConstantRange,
 
     descriptor_pool: vk.DescriptorPool,
     sampler_descriptor_pool: vk.DescriptorPool,
+    input_descriptor_pool: vk.DescriptorPool,
     descriptor_sets: []vk.DescriptorSet,
     sampler_descriptor_sets: std.ArrayList(vk.DescriptorSet),
+    input_descriptor_sets: []vk.DescriptorSet,
 
     vp_uniform_buffer: []vk.Buffer,
     vp_uniform_buffer_memory: []vk.DeviceMemory,
@@ -109,6 +116,10 @@ pub const VulkanRenderer = struct {
     // Pipeline
     graphics_pipeline: vk.Pipeline,
     pipeline_layout: vk.PipelineLayout,
+
+    second_pipeline: vk.Pipeline,
+    second_pipeline_layout: vk.PipelineLayout,
+
     render_pass: vk.RenderPass,
 
     // Pools
@@ -146,6 +157,7 @@ pub const VulkanRenderer = struct {
         try self.getPhysicalDevice();
         try self.createLogicalDevice();
         try self.createSwapchain();
+        try self.createColourBufferImage();
         try self.createDepthBufferImage();
         try self.createRenderPass();
         try self.createDescriptorSetLayout();
@@ -154,12 +166,14 @@ pub const VulkanRenderer = struct {
         try self.createFramebuffers();
         try self.createCommandPool();
 
+        self.sampler_descriptor_sets = try std.ArrayList(vk.DescriptorSet).initCapacity(self.allocator, self.swapchain_images.len);
+
         try self.createCommandBuffers();
         try self.createTextureSampler();
         try self.createUniformBuffers();
         try self.createDescriptorPool();
         try self.createDescriptorSets();
-
+        try self.createInputDescriptorSets();
         try self.createSynchronisation();
 
         self.image_files = std.ArrayList(img.Image).init(self.allocator);
@@ -167,7 +181,6 @@ pub const VulkanRenderer = struct {
         self.texture_image_memory = std.ArrayList(vk.DeviceMemory).init(self.allocator);
         self.texture_image_views = std.ArrayList(vk.ImageView).init(self.allocator);
         self.model_list = std.ArrayList(MeshModel).init(allocator);
-        self.sampler_descriptor_sets = std.ArrayList(vk.DescriptorSet).init(self.allocator);
 
         const aspect: f32 = @as(f32, @floatFromInt(self.extent.width)) / @as(f32, @floatFromInt(self.extent.height));
         self.ubo_view_projection.projection = zm.perspectiveFovRh(
@@ -289,15 +302,34 @@ pub const VulkanRenderer = struct {
         self.texture_image_memory.deinit();
         self.texture_image_views.deinit();
 
-        self.device.destroyImageView(self.depth_buffer_image_view, null);
-        self.device.destroyImage(self.depth_buffer_image, null);
-        self.device.freeMemory(self.depth_buffer_image_memory, null);
+        for (0..self.depth_buffer_image.len) |i| {
+            self.device.destroyImageView(self.depth_buffer_image_view[i], null);
+            self.device.destroyImage(self.depth_buffer_image[i], null);
+            self.device.freeMemory(self.depth_buffer_image_memory[i], null);
+        }
 
+        self.allocator.free(self.depth_buffer_image);
+        self.allocator.free(self.depth_buffer_image_memory);
+        self.allocator.free(self.depth_buffer_image_view);
+
+        for (0..self.colour_buffer_image.len) |i| {
+            self.device.destroyImageView(self.colour_buffer_image_view[i], null);
+            self.device.destroyImage(self.colour_buffer_image[i], null);
+            self.device.freeMemory(self.colour_buffer_image_memory[i], null);
+        }
+
+        self.allocator.free(self.colour_buffer_image);
+        self.allocator.free(self.colour_buffer_image_memory);
+        self.allocator.free(self.colour_buffer_image_view);
+
+        self.device.destroyDescriptorPool(self.input_descriptor_pool, null);
         self.device.destroyDescriptorPool(self.descriptor_pool, null);
         self.device.destroyDescriptorSetLayout(self.descriptor_set_layout, null);
         self.device.destroyDescriptorPool(self.sampler_descriptor_pool, null);
         self.device.destroyDescriptorSetLayout(self.sampler_set_layout, null);
+        self.device.destroyDescriptorSetLayout(self.input_set_layout, null);
         self.sampler_descriptor_sets.deinit();
+        self.allocator.free(self.input_descriptor_sets);
 
         for (0..self.swapchain_images.len) |i| {
             self.device.destroyBuffer(self.vp_uniform_buffer[i], null);
@@ -322,6 +354,8 @@ pub const VulkanRenderer = struct {
 
         self.allocator.free(self.swapchain_framebuffers);
 
+        self.device.destroyPipeline(self.second_pipeline, null);
+        self.device.destroyPipelineLayout(self.second_pipeline_layout, null);
         self.device.destroyPipeline(self.graphics_pipeline, null);
         self.device.destroyPipelineLayout(self.pipeline_layout, null);
         self.device.destroyRenderPass(self.render_pass, null);
@@ -523,8 +557,65 @@ pub const VulkanRenderer = struct {
 
     fn createRenderPass(self: *Self) !void {
         // -- Attachments --
-        // Colour attachment of the render pass
+
+        var subpasses: [2]vk.SubpassDescription = undefined;
+
+        // Subpass 1 attachments and references (input attachments)
+
+        // Colour attachment (input)
+        const colour_format = chooseSupportedFormat(
+            self.physical_device,
+            self.instance,
+            &[_]vk.Format{.r8g8b8a8_srgb},
+            .optimal,
+            .{ .color_attachment_bit = true },
+        );
         const colour_attachment: vk.AttachmentDescription = .{
+            .format = colour_format.?,
+            .samples = .{ .@"1_bit" = true },
+            .load_op = .clear,
+            .store_op = .dont_care,
+            .stencil_load_op = .dont_care,
+            .stencil_store_op = .dont_care,
+            .initial_layout = .undefined,
+            .final_layout = .color_attachment_optimal,
+        };
+
+        // Depth attachment (input)
+        const depth_attachment: vk.AttachmentDescription = .{
+            .format = self.depth_format,
+            .samples = .{ .@"1_bit" = true },
+            .load_op = .clear,
+            .store_op = .dont_care,
+            .stencil_load_op = .dont_care,
+            .stencil_store_op = .dont_care,
+            .initial_layout = .undefined,
+            .final_layout = .depth_stencil_attachment_optimal,
+        };
+
+        // Colour attachment (input) reference
+        const colour_attachment_reference: vk.AttachmentReference = .{
+            .attachment = 1,
+            .layout = .color_attachment_optimal,
+        };
+
+        // Depth attachment (input) reference
+        const depth_attachment_reference: vk.AttachmentReference = .{
+            .attachment = 2,
+            .layout = .depth_stencil_attachment_optimal,
+        };
+
+        subpasses[0] = .{
+            .pipeline_bind_point = .graphics, // Pipeline type subpass is to be bound to
+            .color_attachment_count = 1,
+            .p_color_attachments = @ptrCast(&colour_attachment_reference),
+            .p_depth_stencil_attachment = &depth_attachment_reference,
+        };
+
+        // Subpass 2 attachments and references
+
+        // Colour attachment of the render pass
+        const swapchain_colour_attachment: vk.AttachmentDescription = .{
             .format = self.swapchain_image_format, // Format to use for attachment
             .samples = .{ .@"1_bit" = true }, // Number of samples to write for multisampling
             .load_op = .clear, // Describes what to do with attachment before rendering
@@ -537,42 +628,38 @@ pub const VulkanRenderer = struct {
             .final_layout = vk.ImageLayout.present_src_khr, // Image data layout after render pass (to change to)
         };
 
-        // Depth attachment of render pass
-        const depth_attachment: vk.AttachmentDescription = .{
-            .format = self.depth_format,
-            .samples = .{ .@"1_bit" = true },
-            .load_op = .clear,
-            .store_op = .dont_care,
-            .stencil_load_op = .dont_care,
-            .stencil_store_op = .dont_care,
-            .initial_layout = .undefined,
-            .final_layout = .depth_stencil_attachment_optimal,
-        };
-
-        // -- References --
         // Attachment reference uses an attachment index that refers to index in the attachment list passed to render pass create info
-        const colour_attachment_reference: vk.AttachmentReference = .{
+        const swapchain_colour_attachment_reference: vk.AttachmentReference = .{
             .attachment = 0,
             .layout = vk.ImageLayout.color_attachment_optimal,
         };
 
-        const depth_attachment_reference: vk.AttachmentReference = .{
-            .attachment = 1,
-            .layout = vk.ImageLayout.depth_stencil_attachment_optimal,
+        // References to attachments that subpass will take input from
+        const input_references = [_]vk.AttachmentReference{
+            .{
+                .attachment = 1, // Colour attachment
+                .layout = .shader_read_only_optimal,
+            },
+            .{
+                .attachment = 2, // Depth attachment
+                .layout = .shader_read_only_optimal,
+            },
         };
 
-        // Information about a particular subpass the render pass is using
-        const subpass: vk.SubpassDescription = .{
-            .pipeline_bind_point = .graphics, // Pipeline type subpass is to be bound to
+        subpasses[1] = .{
+            .pipeline_bind_point = .graphics,
             .color_attachment_count = 1,
-            .p_color_attachments = @ptrCast(&colour_attachment_reference),
-            .p_depth_stencil_attachment = &depth_attachment_reference,
+            .p_color_attachments = @ptrCast(&swapchain_colour_attachment_reference),
+            .input_attachment_count = @intCast(input_references.len),
+            .p_input_attachments = &input_references,
         };
 
+        // -- Subpass dependencies
+
         // Need to determine when layout transitions occur using subpass dependencies
-        const subpass_dependencies = [2]vk.SubpassDependency{
+        const subpass_dependencies = [_]vk.SubpassDependency{
             // Conversion from VK_IMAGE_LAYOUT_UNDEFINED to VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL
-            vk.SubpassDependency{
+            .{
                 // Transition must happen after...
                 .src_subpass = vk.SUBPASS_EXTERNAL, // Subpass index (VK_SUBPASS_EXTERNAL = outside of renderpass)
                 .src_stage_mask = .{ .bottom_of_pipe_bit = true }, // Pipeline stage
@@ -582,8 +669,17 @@ pub const VulkanRenderer = struct {
                 .dst_stage_mask = .{ .color_attachment_output_bit = true },
                 .dst_access_mask = .{ .color_attachment_read_bit = true, .color_attachment_write_bit = true },
             },
+            // Subpass 1 layout (colour/depth) to subpass 2 layout (shader read)
+            .{
+                .src_subpass = 0,
+                .src_stage_mask = .{ .color_attachment_output_bit = true },
+                .src_access_mask = .{ .color_attachment_write_bit = true },
+                .dst_subpass = 1,
+                .dst_stage_mask = .{ .fragment_shader_bit = true },
+                .dst_access_mask = .{ .shader_read_bit = true },
+            },
             // Conversion from VK_IMAGE_LAYOUT_COLOR_ATTACHMENT_OPTIMAL to VK_IMAGE_LAYOUT_PRESENT_SRC_KHR
-            vk.SubpassDependency{
+            .{
                 // Transition must happen after...
                 .src_subpass = 0,
                 .src_stage_mask = .{ .color_attachment_output_bit = true },
@@ -596,13 +692,13 @@ pub const VulkanRenderer = struct {
         };
 
         // Order matters
-        const render_pass_attachments = [_]vk.AttachmentDescription{ colour_attachment, depth_attachment };
+        const render_pass_attachments = [_]vk.AttachmentDescription{ swapchain_colour_attachment, colour_attachment, depth_attachment };
 
         const render_pass_create_info: vk.RenderPassCreateInfo = .{
             .attachment_count = @intCast(render_pass_attachments.len),
             .p_attachments = &render_pass_attachments,
-            .subpass_count = 1,
-            .p_subpasses = @ptrCast(&subpass),
+            .subpass_count = @intCast(subpasses.len),
+            .p_subpasses = &subpasses,
             .dependency_count = @intCast(subpass_dependencies.len),
             .p_dependencies = &subpass_dependencies,
         };
@@ -651,6 +747,34 @@ pub const VulkanRenderer = struct {
         };
 
         self.sampler_set_layout = try self.device.createDescriptorSetLayout(&texture_layout_info, null);
+
+        // -- Create input attachment image descriptor set layout
+        // Colour input binding
+        const colour_input_layout_binding: vk.DescriptorSetLayoutBinding = .{
+            .binding = 0,
+            .descriptor_type = .input_attachment,
+            .descriptor_count = 1,
+            .stage_flags = .{ .fragment_bit = true },
+        };
+
+        // Depth input binding
+        const depth_input_layout_binding: vk.DescriptorSetLayoutBinding = .{
+            .binding = 1,
+            .descriptor_type = .input_attachment,
+            .descriptor_count = 1,
+            .stage_flags = .{ .fragment_bit = true },
+        };
+
+        // Array of input attachment bindings
+        const input_bindings = [_]vk.DescriptorSetLayoutBinding{ colour_input_layout_binding, depth_input_layout_binding };
+
+        // Create a descriptor set layout for input attachments
+        const input_layout_create_info: vk.DescriptorSetLayoutCreateInfo = .{
+            .binding_count = @intCast(input_bindings.len),
+            .p_bindings = &input_bindings,
+        };
+
+        self.input_set_layout = try self.device.createDescriptorSetLayout(&input_layout_create_info, null);
     }
 
     fn createPushConstantRange(self: *Self) !void {
@@ -662,7 +786,45 @@ pub const VulkanRenderer = struct {
         };
     }
 
+    fn createColourBufferImage(self: *Self) !void {
+        self.colour_buffer_image = try self.allocator.alloc(vk.Image, self.swapchain_images.len);
+        self.colour_buffer_image_memory = try self.allocator.alloc(vk.DeviceMemory, self.swapchain_images.len);
+        self.colour_buffer_image_view = try self.allocator.alloc(vk.ImageView, self.swapchain_images.len);
+
+        // Get supported format for colour attachment
+        const colour_format = chooseSupportedFormat(
+            self.physical_device,
+            self.instance,
+            &[_]vk.Format{.r8g8b8a8_srgb},
+            .optimal,
+            .{ .color_attachment_bit = true },
+        ) orelse return error.FormatNotSupported;
+
+        // Create colour buffers
+        for (0..self.colour_buffer_image.len) |i| {
+            self.colour_buffer_image[i] = try self.createImage(
+                self.extent.width,
+                self.extent.height,
+                colour_format,
+                .optimal,
+                .{ .color_attachment_bit = true, .input_attachment_bit = true },
+                .{ .device_local_bit = true },
+                &self.colour_buffer_image_memory[i],
+            );
+
+            self.colour_buffer_image_view[i] = try self.createImageView(
+                self.colour_buffer_image[i],
+                colour_format,
+                .{ .color_bit = true },
+            );
+        }
+    }
+
     fn createDepthBufferImage(self: *Self) !void {
+        self.depth_buffer_image = try self.allocator.alloc(vk.Image, self.swapchain_images.len);
+        self.depth_buffer_image_memory = try self.allocator.alloc(vk.DeviceMemory, self.swapchain_images.len);
+        self.depth_buffer_image_view = try self.allocator.alloc(vk.ImageView, self.swapchain_images.len);
+
         // Get supported depth buffer format
         const formats = [_]vk.Format{ .d32_sfloat_s8_uint, .d32_sfloat, .d24_unorm_s8_uint };
         self.depth_format = chooseSupportedFormat(
@@ -673,19 +835,21 @@ pub const VulkanRenderer = struct {
             .{ .depth_stencil_attachment_bit = true },
         ) orelse return error.UnsupportedDepthBufferFormat;
 
-        // Create depth buffer image
-        self.depth_buffer_image = try self.createImage(
-            self.extent.width,
-            self.extent.height,
-            self.depth_format,
-            .optimal,
-            .{ .depth_stencil_attachment_bit = true },
-            .{ .device_local_bit = true },
-            &self.depth_buffer_image_memory,
-        );
+        for (0..self.depth_buffer_image.len) |i| {
+            // Create depth buffer image
+            self.depth_buffer_image[i] = try self.createImage(
+                self.extent.width,
+                self.extent.height,
+                self.depth_format,
+                .optimal,
+                .{ .depth_stencil_attachment_bit = true, .input_attachment_bit = true },
+                .{ .device_local_bit = true },
+                &self.depth_buffer_image_memory[i],
+            );
 
-        // Create depth buffer image view
-        self.depth_buffer_image_view = try self.createImageView(self.depth_buffer_image, self.depth_format, .{ .depth_bit = true });
+            // Create depth buffer image view
+            self.depth_buffer_image_view[i] = try self.createImageView(self.depth_buffer_image[i], self.depth_format, .{ .depth_bit = true });
+        }
     }
 
     fn createGraphicsPipeline(self: *Self) !void {
@@ -705,14 +869,14 @@ pub const VulkanRenderer = struct {
         // -- Shader stage creation information --
 
         // Vertex stage creation information
-        const vertex_shader_create_info: vk.PipelineShaderStageCreateInfo = .{
+        var vertex_shader_create_info: vk.PipelineShaderStageCreateInfo = .{
             .stage = .{ .vertex_bit = true },
             .module = vert,
             .p_name = "main",
         };
 
         // Fragment stage creation information
-        const fragment_shader_create_info: vk.PipelineShaderStageCreateInfo = .{
+        var fragment_shader_create_info: vk.PipelineShaderStageCreateInfo = .{
             .stage = .{ .fragment_bit = true },
             .module = frag,
             .p_name = "main",
@@ -758,7 +922,7 @@ pub const VulkanRenderer = struct {
         };
 
         // -- Vertex input --
-        const vertex_input_create_info: vk.PipelineVertexInputStateCreateInfo = .{
+        var vertex_input_create_info: vk.PipelineVertexInputStateCreateInfo = .{
             .vertex_binding_description_count = 1,
             .p_vertex_binding_descriptions = @ptrCast(&binding_description), // List of vertex binding descriptions (data spacing, stride info)
             .vertex_attribute_description_count = @intCast(attribute_descriptions.len),
@@ -864,7 +1028,7 @@ pub const VulkanRenderer = struct {
         self.pipeline_layout = try self.device.createPipelineLayout(&pipeline_layout_create_info, null);
 
         // -- Depth stencil testing --
-        const depth_stencil_create_info: vk.PipelineDepthStencilStateCreateInfo = .{
+        var depth_stencil_create_info: vk.PipelineDepthStencilStateCreateInfo = .{
             .depth_test_enable = vk.TRUE, // Enable checking depth to determine fragment write
             .depth_write_enable = vk.TRUE, // Enable writing to depth buffer to replace all values
             .depth_compare_op = .less, // Comparison operation that allows an overwrite (is in front)
@@ -877,7 +1041,7 @@ pub const VulkanRenderer = struct {
         };
 
         // -- Graphics pipeline creation --
-        const pipeline_create_info: vk.GraphicsPipelineCreateInfo = .{
+        var pipeline_create_info: vk.GraphicsPipelineCreateInfo = .{
             .stage_count = @intCast(shader_create_infos.len), // Number of shader stages
             .p_stages = &shader_create_infos, // List of shader stages
             .p_vertex_input_state = &vertex_input_create_info,
@@ -903,6 +1067,57 @@ pub const VulkanRenderer = struct {
             null,
             @ptrCast(&self.graphics_pipeline),
         );
+
+        // -- Create second pass pipeline
+        // Second pass shaders
+        const second_vert_shader_module = try self.device.createShaderModule(&.{
+            .code_size = shaders.second_vert.len,
+            .p_code = @ptrCast(&shaders.second_vert),
+        }, null);
+        defer self.device.destroyShaderModule(second_vert_shader_module, null);
+
+        const second_frag_shader_module = try self.device.createShaderModule(&.{
+            .code_size = shaders.second_frag.len,
+            .p_code = @ptrCast(&shaders.second_frag),
+        }, null);
+        defer self.device.destroyShaderModule(second_frag_shader_module, null);
+
+        // Set new shaders
+        vertex_shader_create_info.module = second_vert_shader_module;
+        fragment_shader_create_info.module = second_frag_shader_module;
+
+        const second_shader_stages = [_]vk.PipelineShaderStageCreateInfo{ vertex_shader_create_info, fragment_shader_create_info };
+
+        // No vertex data for second pass
+        vertex_input_create_info.vertex_binding_description_count = 0;
+        vertex_input_create_info.p_vertex_binding_descriptions = null;
+        vertex_input_create_info.vertex_attribute_description_count = 0;
+        vertex_input_create_info.p_vertex_attribute_descriptions = null;
+
+        // Don't want to write to depth buffer
+        depth_stencil_create_info.depth_write_enable = vk.FALSE;
+
+        // Create new pipeline layout
+        const second_pipeline_layout_create_info: vk.PipelineLayoutCreateInfo = .{
+            .set_layout_count = 1,
+            .p_set_layouts = @ptrCast(&self.input_set_layout),
+        };
+
+        self.second_pipeline_layout = try self.device.createPipelineLayout(&second_pipeline_layout_create_info, null);
+
+        pipeline_create_info.stage_count = @intCast(second_shader_stages.len);
+        pipeline_create_info.p_stages = &second_shader_stages;
+        pipeline_create_info.layout = self.second_pipeline_layout;
+        pipeline_create_info.subpass = 1;
+
+        // Create second pipeline
+        _ = try self.device.createGraphicsPipelines(
+            .null_handle,
+            1,
+            @ptrCast(&pipeline_create_info),
+            null,
+            @ptrCast(&self.second_pipeline),
+        );
     }
 
     fn createFramebuffers(self: *Self) !void {
@@ -911,7 +1126,11 @@ pub const VulkanRenderer = struct {
         // Create a frammebuffer for each swapchain image
         for (self.swapchain_images, 0..) |swapchain_image, i| {
             // Order matters
-            const attachments = [_]vk.ImageView{ swapchain_image.image_view, self.depth_buffer_image_view };
+            const attachments = [_]vk.ImageView{
+                swapchain_image.image_view,
+                self.colour_buffer_image_view[i],
+                self.depth_buffer_image_view[i],
+            };
 
             const framebuffer_create_info: vk.FramebufferCreateInfo = .{
                 .render_pass = self.render_pass, // Render pass layout the frambuffer will be used with
@@ -1056,6 +1275,30 @@ pub const VulkanRenderer = struct {
         };
 
         self.sampler_descriptor_pool = try self.device.createDescriptorPool(&sampler_pool_create_info, null);
+
+        // -- Create input attachment descriptor pool
+        // Colour attachment pool size
+        const colour_input_pool_size: vk.DescriptorPoolSize = .{
+            .type = .input_attachment,
+            .descriptor_count = @intCast(self.colour_buffer_image_view.len),
+        };
+
+        // Depth attachment pool size
+        const depth_input_pool_size: vk.DescriptorPoolSize = .{
+            .type = .input_attachment,
+            .descriptor_count = @intCast(self.depth_buffer_image_view.len),
+        };
+
+        const input_pool_sizes = [_]vk.DescriptorPoolSize{ colour_input_pool_size, depth_input_pool_size };
+
+        // Create input attachment pool
+        const input_pool_create_info: vk.DescriptorPoolCreateInfo = .{
+            .max_sets = @intCast(self.swapchain_images.len),
+            .pool_size_count = @intCast(input_pool_sizes.len),
+            .p_pool_sizes = &input_pool_sizes,
+        };
+
+        self.input_descriptor_pool = try self.device.createDescriptorPool(&input_pool_create_info, null);
     }
 
     fn createDescriptorSets(self: *Self) !void {
@@ -1108,6 +1351,74 @@ pub const VulkanRenderer = struct {
         }
     }
 
+    fn createInputDescriptorSets(self: *Self) !void {
+        self.input_descriptor_sets = try self.allocator.alloc(vk.DescriptorSet, self.swapchain_images.len);
+
+        // Fill array of layouts ready for set creation
+        var set_layouts = try self.allocator.alloc(vk.DescriptorSetLayout, self.swapchain_images.len);
+        defer self.allocator.free(set_layouts);
+        for (0..set_layouts.len) |i| {
+            set_layouts[i] = self.input_set_layout;
+        }
+
+        // Input attachment descriptor set allocation info
+        const set_alloc_info: vk.DescriptorSetAllocateInfo = .{
+            .descriptor_pool = self.input_descriptor_pool,
+            .descriptor_set_count = @intCast(self.swapchain_images.len),
+            .p_set_layouts = set_layouts.ptr,
+        };
+
+        // Allocate descriptor sets
+        try self.device.allocateDescriptorSets(&set_alloc_info, self.input_descriptor_sets.ptr);
+
+        // Update each descriptor set with input attachment
+        for (0..self.swapchain_images.len) |i| {
+            // Colour attachment descriptor
+            const colour_attachment_descriptor: vk.DescriptorImageInfo = .{
+                .image_layout = .shader_read_only_optimal,
+                .image_view = self.colour_buffer_image_view[i],
+                .sampler = .null_handle,
+            };
+
+            // Colour attachment descriptor write
+            const colour_write: vk.WriteDescriptorSet = .{
+                .dst_set = self.input_descriptor_sets[i],
+                .dst_binding = 0,
+                .dst_array_element = 0,
+                .descriptor_type = .input_attachment,
+                .descriptor_count = 1,
+                .p_image_info = @ptrCast(&colour_attachment_descriptor),
+                .p_buffer_info = undefined,
+                .p_texel_buffer_view = undefined,
+            };
+
+            // Depth attachment descriptor
+            const depth_attachment_descriptor: vk.DescriptorImageInfo = .{
+                .image_layout = .shader_read_only_optimal,
+                .image_view = self.depth_buffer_image_view[i],
+                .sampler = .null_handle,
+            };
+
+            // Depth attachment descriptor write
+            const depth_write: vk.WriteDescriptorSet = .{
+                .dst_set = self.input_descriptor_sets[i],
+                .dst_binding = 1,
+                .dst_array_element = 0,
+                .descriptor_type = .input_attachment,
+                .descriptor_count = 1,
+                .p_image_info = @ptrCast(&depth_attachment_descriptor),
+                .p_buffer_info = undefined,
+                .p_texel_buffer_view = undefined,
+            };
+
+            // List of input descriptor set writes
+            const set_writes = [_]vk.WriteDescriptorSet{ colour_write, depth_write };
+
+            // Update descriptor sets
+            self.device.updateDescriptorSets(@intCast(set_writes.len), &set_writes, 0, null);
+        }
+    }
+
     fn updateUniformBuffers(self: *Self, image_index: u32) !void {
         // Copy VP data
         const data = try self.device.mapMemory(
@@ -1130,7 +1441,8 @@ pub const VulkanRenderer = struct {
         };
 
         const clear_values = [_]vk.ClearValue{
-            .{ .color = .{ .float_32 = [4]f32{ 0.6, 0.65, 0.4, 1.0 } } },
+            .{ .color = .{ .float_32 = .{ 0.0, 0.0, 0.0, 0.0 } } },
+            .{ .color = .{ .float_32 = .{ 0.6, 0.65, 0.4, 1.0 } } },
             .{ .depth_stencil = .{ .depth = 1.0, .stencil = 1 } },
         };
 
@@ -1204,6 +1516,21 @@ pub const VulkanRenderer = struct {
                 }
             }
 
+            // Start second subpass
+            command_buffer.nextSubpass(.@"inline");
+
+            command_buffer.bindPipeline(.graphics, self.second_pipeline);
+            command_buffer.bindDescriptorSets(
+                .graphics,
+                self.second_pipeline_layout,
+                0,
+                1,
+                @ptrCast(&self.input_descriptor_sets[current_image]),
+                0,
+                null,
+            );
+            command_buffer.draw(3, 1, 0, 0);
+
             // End render pass
             command_buffer.endRenderPass();
         }