fixed buffer inaccessible

README.md

@@ -1,25 +0,0 @@
-# Eruption
-Eruption is a vulkan based pathtracer. It is in an experimental state an may have performance issues
-
-# Features
-* flat and gouraud shading
-* physically based rendering (PBR)
-* Oren-Nayar diffuse BRDF
-* Schlick approximation for fresnel equations
-* Cosine weighted sampling
-* Temporal anti aliasing
-* Realtime denoising
-* Reinhard jodie tonemapping
-* Progressive sampling
-
-# Screenshots
-
-Cornellbox | Dark suzanne
-:-------------------------:|:-------------------------:
-![](https://git.montehaselino.de/servostar/eruption/raw/branch/main/screenshots/Screenshot_20230420_143057.png) | ![](https://git.montehaselino.de/servostar/eruption/raw/branch/main/screenshots/Screenshot_20230420_143346.png)
-
-Scene with text | RGB lights
-:-------------------------:|:-------------------------:
-![](https://git.montehaselino.de/servostar/eruption/raw/branch/main/screenshots/Screenshot_20230420_145416.png) | ![](https://git.montehaselino.de/servostar/eruption/raw/branch/main/screenshots/Screenshot_20230420_145957.png)
-
-![](https://git.montehaselino.de/servostar/eruption/raw/branch/main/screenshots/Screenshot_20230420_150915.png)

res/head.mtl

@@ -1,72 +0,0 @@
-# Blender 3.4.1 MTL File: 'None'
-# www.blender.org
-
-newmtl glass
-Ns 1000.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2
-
-newmtl glossy
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2
-
-newmtl green
-Ns 0.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.000000 0.000000 0.000000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 1
-
-newmtl light
-Ns 0.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.000000 0.000000 0.000000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 1
-
-newmtl red
-Ns 0.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.000000 0.000000 0.000000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 1
-
-newmtl white
-Ns 0.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.000000 0.000000 0.000000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 1
-
-newmtl white
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2

res/light_box.mtl

@@ -1,42 +0,0 @@
-# Blender 3.4.1 MTL File: 'None'
-# www.blender.org
-
-newmtl light
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2
-
-newmtl light_green
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2
-
-newmtl light_red
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2
-
-newmtl white
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2

res/plane.mtl

@@ -1,42 +0,0 @@
-# Blender 3.4.1 MTL File: 'None'
-# www.blender.org
-
-newmtl light_blue
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2
-
-newmtl light_green
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2
-
-newmtl light_red
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2
-
-newmtl white
-Ns 250.000000
-Ka 1.000000 1.000000 1.000000
-Kd 0.800000 0.800000 0.800000
-Ks 0.500000 0.500000 0.500000
-Ke 0.000000 0.000000 0.000000
-Ni 1.450000
-d 1.000000
-illum 2

src/shader/composite/final.frag

@@ -24,7 +24,7 @@ void main() {
 
     vec3 color = texture(image, uv).rgb;
 
-    color = smart_de_noise(image, uv, 5.0, 1.0, 0.200).rgb;
+    color = smart_de_noise(image, uv, 5.0, 1.0, 0.400).rgb;
 
     color = reinhard_jodie(color);
 

src/shader/pathtracing/bsdf.glsl

@@ -0,0 +1 @@
+

src/shader/pathtracing/camera.rs

@@ -17,8 +17,8 @@ impl Camera {
             front: Vector3::new(0.0, 0.0, -1.0),
             left: Vector3::new(1.0, 0.0, 0.0),
             up: Vector3::new(0.0, -1.0, 0.0),
-            pos: Vector3::new(0.0, 0.0, 3.9),
-            fov: 120.0f32
+            pos: Vector3::new(0.0, 1.0, 9.0),
+            fov: 90.0f32
         }
     }
 

src/shader/pathtracing/mod.rs

@@ -4,7 +4,7 @@ use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
 use std::time::Instant;
 use lazy_static::lazy_static;
-use vulkano::buffer::{Buffer, BufferContents, BufferCreateInfo, BufferError, BufferUsage, Subbuffer};
+use vulkano::buffer::{Buffer, BufferCreateInfo, BufferUsage, Subbuffer};
 use vulkano::buffer::allocator::{SubbufferAllocator, SubbufferAllocatorCreateInfo};
 use vulkano::command_buffer::allocator::StandardCommandBufferAllocator;
 use vulkano::command_buffer::{AutoCommandBufferBuilder, CommandBufferUsage, PrimaryAutoCommandBuffer, PrimaryCommandBufferAbstract};
@@ -36,10 +36,10 @@ lazy_static! {
         emission: Padded::from([0.0, 0.0, 0.0]),
         specular_color: [0.0, 0.0, 0.0],
         roughness: 1.0,
-        specular: 0.0,
         transmission: 0.0,
         ior: 1.0,
         metallic: false as u32,
+        __padding: 0
     };
 }
 
@@ -50,121 +50,88 @@ fn add_default_materials() {
         albedo: Padded::from([1.0, 1.0, 1.0]),
         emission: Padded::from([0.0, 0.0, 0.0]),
         specular_color: [0.0, 0.0, 0.0],
-        roughness: 0.4,
-        specular: 0.0,
+        roughness: 1.0,
         transmission: 0.0,
         ior: 1.0,
         metallic: false as u32,
-    });
-
-    material_collection.insert(String::from("mirror"), cs::Material {
-        albedo: Padded::from([1.0, 1.0, 1.0]),
-        emission: Padded::from([0.0, 0.0, 0.0]),
-        specular_color: [0.0, 0.0, 0.0],
-        roughness: 0.12,
-        specular: 1.0,
-        transmission: 0.0,
-        ior: 1.0,
-        metallic: true as u32,
-    });
-
-    material_collection.insert(String::from("gold"), cs::Material {
-        albedo: Padded::from([0.944, 0.776, 0.373]),
-        emission: Padded::from([0.0, 0.0, 0.0]),
-        specular_color: [0.0, 0.0, 0.0],
-        roughness: 0.4,
-        specular: 0.0,
-        transmission: 0.0,
-        ior: 1.0,
-        metallic: true as u32,
+        __padding: 0
     });
 
     material_collection.insert(String::from("red"), cs::Material {
         albedo: Padded::from([1.0, 0.0, 0.0]),
         emission: Padded::from([0.0, 0.0, 0.0]),
         specular_color: [0.0, 0.0, 0.0],
-        roughness: 0.4,
-        specular: 0.0,
+        roughness: 1.0,
         transmission: 0.0,
         ior: 1.0,
         metallic: false as u32,
+        __padding: 0
     });
 
     material_collection.insert(String::from("green"), cs::Material {
         albedo: Padded::from([0.0, 1.0, 0.0]),
         emission: Padded::from([0.0, 0.0, 0.0]),
         specular_color: [0.0, 0.0, 0.0],
-        roughness: 0.4,
-        specular: 0.0,
+        roughness: 1.0,
         transmission: 0.0,
         ior: 1.0,
         metallic: false as u32,
+        __padding: 0
     });
 
     material_collection.insert(String::from("glass"), cs::Material {
         albedo: Padded::from([1.0, 1.0, 1.0]),
         emission: Padded::from([0.0, 0.0, 0.0]),
         specular_color: [0.0, 0.0, 0.0],
-        roughness: 0.0,
-        specular: 0.0,
+        roughness: 1.5,
         transmission: 1.0,
         ior: 1.0,
         metallic: false as u32,
+        __padding: 0
     });
 
     material_collection.insert(String::from("light"), cs::Material {
         albedo: Padded::from([1.0, 1.0, 1.0]),
         emission: Padded::from([1.0, 1.0, 1.0]),
         specular_color: [0.0, 0.0, 0.0],
-        roughness: 1.0,
-        specular: 0.0,
+        roughness: 1.5,
         transmission: 0.0,
         ior: 0.0,
         metallic: false as u32,
+        __padding: 0
     });
 
     material_collection.insert(String::from("light_blue"), cs::Material {
         albedo: Padded::from([0.3, 0.3, 1.0]),
         emission: Padded::from([0.3, 0.3, 1.0]),
         specular_color: [0.0, 0.0, 0.0],
-        roughness: 1.0,
-        specular: 0.0,
+        roughness: 1.5,
         transmission: 0.0,
         ior: 0.0,
         metallic: false as u32,
+        __padding: 0
     });
 
     material_collection.insert(String::from("light_red"), cs::Material {
         albedo: Padded::from([1.0, 0.3, 0.3]),
         emission: Padded::from([1.0, 0.3, 0.3]),
         specular_color: [0.0, 0.0, 0.0],
-        roughness: 1.0,
-        specular: 0.0,
+        roughness: 1.5,
         transmission: 0.0,
         ior: 0.0,
         metallic: false as u32,
+        __padding: 0
     });
 
     material_collection.insert(String::from("light_green"), cs::Material {
         albedo: Padded::from([0.3, 1.0, 0.3]),
         emission: Padded::from([0.3, 1.0, 0.3]),
         specular_color: [0.0, 0.0, 0.0],
-        roughness: 1.0,
-        specular: 0.0,
-        transmission: 0.0,
-        ior: 0.0,
-        metallic: false as u32,
-    });
-
-    material_collection.insert(String::from("glossy"), cs::Material {
-        albedo: Padded::from([1.0, 1.0, 1.0]),
-        emission: Padded::from([0.0, 0.0, 0.0]),
-        specular_color: [0.0, 0.0, 0.0],
-        roughness: 0.0,
-        specular: 1.0,
+        roughness: 1.5,
         transmission: 0.0,
         ior: 0.0,
         metallic: false as u32,
+        __padding: 0
     });
 }
 
@@ -179,7 +146,6 @@ pub struct PathtracerPipeline {
     uniform_buffer: Arc<SubbufferAllocator>,
     vertex_buffer: Subbuffer<[[f32; 4]]>,
     index_buffer: Subbuffer<[u32]>,
-    normal_buffer: Subbuffer<[[f32; 4]]>,
     material_buffer: Subbuffer<[cs::Material]>,
     camera: Camera,
     frames: f32
@@ -211,9 +177,9 @@ impl PathtracerPipeline {
             },
         );
 
-        let (vertices, indices, normals, materials) = load_example_scene();
+        let (vertices, indices, materials) = load_example_scene();
 
-        let (vertex_buffer, index_buffer, normal_buffer, materials) = create_gpu_buffer(&vertices, &indices, &normals, &materials, &renderer.memory_allocator);
+        let (vertex_buffer, index_buffer, materials) = create_gpu_buffer(&vertices, &indices, &materials, &renderer.memory_allocator);
 
         return PathtracerPipeline {
             compute_queue: compute_queue.clone(),
@@ -225,7 +191,6 @@ impl PathtracerPipeline {
             uniform_buffer: Arc::new(uniform_buffer),
             vertex_buffer,
             index_buffer,
-            normal_buffer,
             material_buffer: materials,
             seconds: Instant::now(),
             camera: Camera::new(),
@@ -259,7 +224,6 @@ impl PathtracerPipeline {
         let image = create_image(&self.memory_allocator, &self.compute_queue, size);
 
         self.image = image;
-        self.frames = 0.0;
     }
 
     /// Builds the command for a dispatch.
@@ -293,8 +257,7 @@ impl PathtracerPipeline {
                 WriteDescriptorSet::buffer(2, subbuffer),
                 WriteDescriptorSet::buffer(3, self.vertex_buffer.clone()),
                 WriteDescriptorSet::buffer(4, self.index_buffer.clone()),
-                WriteDescriptorSet::buffer(5, self.material_buffer.clone()),
-                WriteDescriptorSet::buffer(6, self.normal_buffer.clone())
+                WriteDescriptorSet::buffer(5, self.material_buffer.clone())
             ],
         ).unwrap();
 
@@ -327,18 +290,16 @@ fn create_image(memory_allocator: &StandardMemoryAllocator, queue: &Arc<Queue>,
     ).unwrap()
 }
 
-fn load_example_scene() -> (Vec<[f32; 4]>, Vec<u32>, Vec<[f32; 4]>, Vec<cs::Material>) {
-    let (mut models, materials) = tobj::load_obj("res/head.obj", &tobj::GPU_LOAD_OPTIONS).expect("unable to load scene from obj");
+fn load_example_scene() -> (Vec<[f32; 4]>, Vec<u32>, Vec<cs::Material>) {
+    let (mut models, materials) = tobj::load_obj("res/example-scene.obj", &tobj::GPU_LOAD_OPTIONS).expect("unable to load scene from obj");
 
     // allocate some host memory
     let mut vertices:Vec<[f32; 4]> = vec![];
     let mut indices:Vec<u32> = vec![];
     let mut shader_materials:Vec<cs::Material> = vec![];
 
-    let mut normals:Vec<[f32; 4]> = vec![];
-
     for model in models.iter_mut() {
-        let vertex_offset = vertices.len() as u32;
+        let offset = vertices.len() as u32;
 
         let material = model.mesh.material_id.unwrap_or(0);
 
@@ -355,54 +316,20 @@ fn load_example_scene() -> (Vec<[f32; 4]>, Vec<u32>, Vec<[f32; 4]>, Vec<cs::Mate
 
         // fill the index buffer
         for index in model.mesh.indices.iter() {
-            indices.push(*index + vertex_offset);
-        }
-
-        // fill the normal buffer
-        for normal_index in (0..model.mesh.normals.len()).step_by(3) {
-            normals.push([
-                model.mesh.normals[normal_index],
-                model.mesh.normals[normal_index + 1],
-                model.mesh.normals[normal_index + 2],
-                0.0 // padding
-            ]);
+            indices.push(*index + offset);
         }
     }
 
-    println!("loaded vertices: {}", vertices.len());
-    println!("loaded indices: {}", indices.len());
-    println!("loaded normals: {}", normals.len());
-
     let material_collection = &MATERIAL_COLLECTIO.lock().unwrap();
     for material in materials.unwrap().iter() {
         shader_materials.push(*material_collection.get(&material.name).unwrap_or(&DEFAULT_MATERIAL));
     }
 
-    (vertices, indices, normals, shader_materials)
+    (vertices, indices, shader_materials)
 }
 
-fn create_gpu_buffer(vertices: &Vec<[f32; 4]>, indices: &Vec<u32>, normals: &Vec<[f32; 4]>, materials: &Vec<cs::Material>, memory_allocator: &StandardMemoryAllocator) -> (Subbuffer<[[f32; 4]]>, Subbuffer<[u32]>, Subbuffer<[[f32; 4]]>, Subbuffer<[cs::Material]>) {
-    let vertex_buffer = create_subbuffer_from_host(memory_allocator, vertices)
-        .expect("Failed to create subbuffer for vertices");
-
-    let index_buffer = create_subbuffer_from_host(memory_allocator, indices)
-        .expect("Failed to create subbuffer for indices");
-
-    let normal_buffer = create_subbuffer_from_host(memory_allocator, normals)
-        .expect("Failed to create subbuffer for vertices");
-
-    let material_buffer = create_subbuffer_from_host(memory_allocator, materials)
-        .expect("Failed to create subbuffer for material");
-
-    (vertex_buffer, index_buffer, normal_buffer, material_buffer)
-}
-
-fn create_subbuffer_from_host<T, I>(memory_allocator: &StandardMemoryAllocator, host_data: &I) -> Result<Subbuffer<[T]>, BufferError> where
-    T: BufferContents,
-    I: IntoIterator<Item = T> + Clone,
-    I::IntoIter: ExactSizeIterator, {
-
-    Buffer::from_iter(
+fn create_gpu_buffer(vertices: &Vec<[f32; 4]>, indices: &Vec<u32>, materials: &Vec<cs::Material>, memory_allocator: &StandardMemoryAllocator) -> (Subbuffer<[[f32; 4]]>, Subbuffer<[u32]>, Subbuffer<[cs::Material]>) {
+    let vertex_buffer = Buffer::from_iter(
         memory_allocator,
         BufferCreateInfo {
             usage: BufferUsage::STORAGE_BUFFER,
@@ -412,6 +339,34 @@ fn create_subbuffer_from_host<T, I>(memory_allocator: &StandardMemoryAllocator,
             usage: MemoryUsage::Upload,
             ..Default::default()
         },
-        host_data.clone(),
-    )
+        vertices.clone(),
+    ).unwrap();
+
+    let index_buffer = Buffer::from_iter(
+        memory_allocator,
+        BufferCreateInfo {
+            usage: BufferUsage::STORAGE_BUFFER,
+            ..Default::default()
+        },
+        AllocationCreateInfo {
+            usage: MemoryUsage::Upload,
+            ..Default::default()
+        },
+        indices.clone(),
+    ).unwrap();
+
+    let material_buffer = Buffer::from_iter(
+        memory_allocator,
+        BufferCreateInfo {
+            usage: BufferUsage::STORAGE_BUFFER,
+            ..Default::default()
+        },
+        AllocationCreateInfo {
+            usage: MemoryUsage::Upload,
+            ..Default::default()
+        },
+        materials.clone(),
+    ).unwrap();
+
+    (vertex_buffer, index_buffer, material_buffer)
 }

src/shader/pathtracing/pathtracer.comp

@@ -27,32 +27,6 @@ uint get_pixel_index() {
     return gl_GlobalInvocationID.y * uint(program_metadata.resolution.x) + gl_GlobalInvocationID.x;
 }
 
-// from: https://github.com/glslify/glsl-diffuse-oren-nayar/blob/master/index.glsl
-vec3 oren_nayar_diffuse(in vec3 lightDirection, in vec3 viewDirection, in vec3 surfaceNormal, in float roughness, in vec3 albedo) {
-    float LdotV = dot(lightDirection, viewDirection);
-    float NdotL = dot(lightDirection, surfaceNormal);
-    float NdotV = dot(surfaceNormal, viewDirection);
-
-    float s = LdotV - NdotL * NdotV;
-    float t = mix(1.0, max(NdotL, NdotV), step(0.0, s));
-
-    float sigma2 = roughness * roughness;
-    vec3 A = 1.0 + sigma2 * (albedo / (sigma2 + 0.13) + 0.5 / (sigma2 + 0.33));
-    float B = 0.45 * sigma2 / (sigma2 + 0.09);
-
-    return albedo * max(0.0, NdotL) * (A + B * s / t) / PI;
-}
-
-float schlick(in float cosTheta, in float R0) {
-    return R0 + (1.0 - R0) * pow(1.0 - cosTheta, 5.0);
-}
-
-float R0(in float ior) {
-    float a = (ior - 1.0);
-    float b = (ior + 1.0);
-    return (a * a) / (b * b);
-}
-
 vec3 trace_direct(in Ray ray) {
     vec3 color = vec3(0);
     vec3 throughput = vec3(1);
@@ -68,48 +42,12 @@ vec3 trace_direct(in Ray ray) {
 
         Material material = materials[hit.material_index];
 
-        color += material.emission * 512.0 * throughput * pdf;
-
-        float R0 = R0(1.45);
-        float fresnel = schlick(abs(dot(ray.direction, hit.normal)), R0);
-
-        ray.origin = ray.origin + ray.direction * hit.depth;
-
-        // metalic
-        if (material.metallic) {
-            // reflection ray
-            ray.direction = generate_brdf_ray_direction(hit.normal, ray.direction, material.roughness);
+        color += material.emission * 64.0 * throughput * pdf;
 
         throughput *= material.albedo;
-            continue;
-        }
 
-        // transmission
-        if (material.transmission > random()) {
-
-            if (random() < fresnel) {
-                // reflection ray
-                ray.direction = generate_brdf_ray_direction(hit.normal, ray.direction, material.roughness);
-            } else {
-                // refraction ray
-                ray.direction = generate_btdf_ray_direction(-hit.normal, ray.direction, material.roughness, material.ior);
-            }
-
-            continue;
-        }
-
-        // dielectric
-        if (random() < material.specular * fresnel) {
-            // reflection ray
-            ray.direction = generate_brdf_ray_direction(hit.normal, ray.direction, material.roughness);
-        } else {
-            vec3 incident = ray.direction;
-
-            // diffuse ray
+        ray.origin = ray.origin + ray.direction * hit.depth;
         ray.direction = generate_brdf_ray_direction(hit.normal, ray.direction, 1.0);
-
-            throughput *= oren_nayar_diffuse(ray.direction, incident, hit.normal, material.roughness, material.albedo);
-        }
     }
 
     return color;

src/shader/pathtracing/rand/one-at-a-time.glsl

@@ -0,0 +1,22 @@
+#ifdef _ONE_AT_A_TIME_
+
+uint x;
+
+void init_random_state_one_at_a_time(in float seed) {
+    x = ((gl_GlobalInvocationID.y << 16) | (gl_GlobalInvocationID.x)) + floatBitsToInt(seed);
+}
+
+// A single iteration of Bob Jenkins' One-At-A-Time hashing algorithm.
+uint one_at_a_time_hash() {
+    x += (x << 10u);
+    x ^= (x >> 6u);
+    x += (x << 3u);
+    x ^= (x >> 11u);
+    x += (x << 15u);
+    return x;
+}
+
+#define HASH_FUNCTION one_at_a_time_hash
+#define INIT_STATE_FUNCTION init_random_state_one_at_a_time
+
+#endif

src/shader/pathtracing/rand/random.glsl

@@ -1,32 +1,30 @@
 #ifndef __RANDOM_GLSL__
 #define __RANDOM_GLSL__
 
-// Gold Noise ©2015 dcerisano@standard3d.com
-// - based on the Golden Ratio
-// - uniform normalized distribution
-// - fastest static noise generator function (also runs at low precision)
-// - use with indicated fractional seeding method.
+#define _ONE_AT_A_TIME_
+//#define _XOSHIRO_
 
-const float PHI = 1.61803398874989484820459;  // Φ = Golden Ratio
+#include "one-at-a-time.glsl"
+#include "xoshiro.glsl"
 
-// different for every pixel on the image
-vec2 xy;
-// different for every iteration and based on time
-float seed;
+// Construct a float with half-open range [0:1] using low 23 bits.
+// All zeroes yields 0.0, all ones yields the next smallest representable value below 1.0.
+float floatConstruct(in uint m) {
+    const uint ieeeMantissa = 0x007FFFFFu; // binary32 mantissa bitmask
+    const uint ieeeOne = 0x3F800000u; // 1.0 in IEEE binary32
 
-// based on https://www.shadertoy.com/view/ltB3zD
-float gold_noise(){
-    return fract(tan(distance(xy * PHI, xy) * seed)*xy.x);
+    m &= ieeeMantissa;                     // Keep only mantissa bits (fractional part)
+    m |= ieeeOne;                          // Add fractional part to 1.0
+
+    return uintBitsToFloat(m) - 1.0;
 }
 
-void init_random_state(in float time) {
-    xy = vec2(gl_GlobalInvocationID.xy);
-    seed = time;
+void init_random_state(in float seed) {
+    INIT_STATE_FUNCTION(seed);
 }
 
 float random() {
-    seed += 0.1;
-    return gold_noise();
+    return floatConstruct(HASH_FUNCTION());
 }
 
 #endif

src/shader/pathtracing/rand/xoshiro.glsl

@@ -0,0 +1,36 @@
+
+#ifdef _XOSHIRO_
+
+uint rol(in uint x, in uint k) {
+    return (x << k) | (x >> (32 - k));
+}
+
+uint XoshiroState[4];
+
+void init_random_state_xhoshiro(in float seed) {
+    uint utime = floatBitsToUint(seed);
+    XoshiroState[0] = ((gl_GlobalInvocationID.x << 16) | gl_GlobalInvocationID.y) + utime;
+    XoshiroState[1] = XoshiroState[0] ^ utime;
+    XoshiroState[2] = 0x92abc32;
+    XoshiroState[3] = rol(utime, 16);
+}
+
+uint xoshiro_hash() {
+    uint result = rol(XoshiroState[1] * 5, 7) * 9;
+    uint t = XoshiroState[1] << 8;
+
+    XoshiroState[2] ^= XoshiroState[0];
+    XoshiroState[3] ^= XoshiroState[1];
+    XoshiroState[1] ^= XoshiroState[2];
+    XoshiroState[0] ^= XoshiroState[3];
+
+    XoshiroState[2] ^= t;
+    XoshiroState[3] = rol(XoshiroState[3], 22);
+
+    return result;
+}
+
+#define HASH_FUNCTION xoshiro_hash
+#define INIT_STATE_FUNCTION init_random_state_xhoshiro
+
+#endif

src/shader/pathtracing/raytracing/bsdf.glsl

@@ -41,20 +41,9 @@ vec3 cosine_weighted_hemisphere(in float radius) {
 }
 
 vec3 generate_brdf_ray_direction(in vec3 normal, in vec3 incident, in float roughness) {
-    vec3 merged_normal = mix(reflect(incident, normal), normal, roughness * roughness);
+    vec3 merged_normal = mix(normal, reflect(incident, normal), 1.0 - roughness);
 
-    vec3 hemisphere = cosine_weighted_hemisphere(roughness * roughness);
-
-    vec3 u, v, w;
-    construct_orthonormal_basis(merged_normal, u, v, w);
-
-    return u * hemisphere.x + v * hemisphere.y + w * hemisphere.z;
-}
-
-vec3 generate_btdf_ray_direction(in vec3 normal, in vec3 incident, in float roughness, in float ior) {
-    vec3 merged_normal = mix(refract(incident, normal, ior), normal, roughness * roughness);
-
-    vec3 hemisphere = cosine_weighted_hemisphere(roughness * roughness);
+    vec3 hemisphere = cosine_weighted_hemisphere(roughness);
 
     vec3 u, v, w;
     construct_orthonormal_basis(merged_normal, u, v, w);

src/shader/pathtracing/raytracing/raytracing.glsl

@@ -30,31 +30,30 @@ struct Material {
     vec3 specular_color;
     // roughtness of the microfacets
     float roughness;
-    float specular;
     // index of refraction (exclusive to metalic)
     float ior;
     // how transmissive the surface is (exclusive to metalic)
     float transmission;
     // whether the surface is metalic or not (exclusive to ior and transmission)
     bool metallic;
+    // extra padding required for vulkano not properly padding the structs in the buffer
+    // the size of the useble data is 60 bytes, GLSL will add 4 additional bytes, to round up to 64.
+    // for compatibility I added the padding manually
+    bool __padding;
 };
 
-layout(set = 0, binding = 3) readonly buffer VertexBuffer {
+layout(set = 0, binding = 3) buffer VertexBuffer {
     vec4 vertices[];
 };
 
-layout(set = 0, binding = 4) readonly buffer IndexBuffer {
+layout(set = 0, binding = 4) buffer IndexBuffer {
     uint indices[];
 };
 
-layout(set = 0, binding = 5) readonly buffer MaterialBuffer {
+layout(set = 0, binding = 5) buffer MaterialBuffer {
     Material materials[];
 };
 
-layout(set = 0, binding = 6) readonly buffer NormalBuffer {
-    vec4 normals[];
-};
-
 // from: https://iquilezles.org/articles/intersectors/ with a view modifications
 vec3 intersect_triangle(in Ray ray, in vec3 v0, in vec3 v1, in vec3 v2, out vec3 n) {
     // triangle edges
@@ -75,7 +74,7 @@ vec3 intersect_triangle(in Ray ray, in vec3 v0, in vec3 v1, in vec3 v2, out vec3
 
     // test if the intersection lies outside of the triangle by checking the bounds of the barycentric coordinates
     // also perform backface culling
-    if(u < 0.0 || v < 0.0 || (u + v) > 1.0)
+    if(u < 0.0 || v < 0.0 || (u + v) > 1.0 || d > 0.0)
         t = -1.0;
 
     return vec3(t, u, v);
@@ -87,13 +86,9 @@ Hit intersect_scene(in Ray ray) {
     hit.intersected = false;
 
     for (int i = 0; i < indices.length(); i += 3) {
-        uint index_0 = indices[i];
-        uint index_1 = indices[i + 1];
-        uint index_2 = indices[i + 2];
-
-        vec3 v0 = vertices[index_0].xyz;
-        vec3 v1 = vertices[index_1].xyz;
-        vec3 v2 = vertices[index_2].xyz;
+        vec3 v0 = vertices[indices[i]].xyz;
+        vec3 v1 = vertices[indices[i + 1]].xyz;
+        vec3 v2 = vertices[indices[i + 2]].xyz;
 
         vec3 normal;
         vec3 result = intersect_triangle(ray, v0, v1, v2, normal);
@@ -101,12 +96,7 @@ Hit intersect_scene(in Ray ray) {
         if (result.x > ray.near && result.x < hit.depth) {
             hit.barycentric = result.yz;
             hit.depth = result.x;
-
-            vec2 smoother_barycentric = smoothstep(vec2(0.0), vec2(1.0), result.yz);
-
-            // gouraud shading: interpolate between vertex normals with barycentric coordinates
-            hit.normal = mix(mix(normals[index_0], normals[index_1], smoother_barycentric.x), normals[index_2], smoother_barycentric.y).xyz;
-            // flat shading only: use raw triangle normals: hit.normal = normalize(normal);
+            hit.normal = normalize(normal);
             hit.material_index = uint(vertices[indices[i]].a);
             hit.intersected = true;
         }

src/vulkan/mod.rs

@@ -2,7 +2,6 @@ mod device;
 pub(crate) mod textured_quad;
 
 use std::sync::Arc;
-use std::thread;
 use std::time::Instant;
 use vulkano::device::{Device};
 use vulkano::image::{ImageAccess, ImageUsage, SwapchainImage};
@@ -20,7 +19,6 @@ use vulkano::pipeline::graphics::viewport::Viewport;
 use vulkano::render_pass::{Framebuffer, FramebufferCreateInfo, RenderPass};
 use vulkano::sync::{FlushError, GpuFuture};
 use winit::event::{Event, VirtualKeyCode, WindowEvent};
-use winit::platform::run_return::EventLoopExtRunReturn;
 use crate::shader::composite::TextureDrawPipeline;
 use crate::shader::pathtracing::PathtracerPipeline;
 
@@ -57,7 +55,7 @@ pub fn init() {
     //
     // This returns a `vulkano::swapchain::Surface` object that contains both a cross-platform
     // winit window and a cross-platform Vulkan surface that represents the surface of the window.
-    let mut event_loop = EventLoop::new();
+    let event_loop = EventLoop::new();
     let surface = WindowBuilder::new()
         .build_vk_surface(&event_loop, instance.clone())
         .unwrap();
@@ -110,7 +108,7 @@ pub fn init() {
     //
     // Since we need to draw to multiple images, we are going to create a different framebuffer for
     // each image.
-    let mut framebuffers = window_size_dependent_setup(&images, &render_pass, &mut viewport, &mut pathtracer);
+    let mut framebuffers = window_size_dependent_setup(&images, render_pass.clone(), &mut viewport, &mut pathtracer);
 
     // Initialization is finally finished!
 
@@ -135,19 +133,74 @@ pub fn init() {
 
     let texture_drawer = TextureDrawPipeline::new(&renderer, &queue, &render_pass);
 
+    let mut now_keys = [false; 255];
+
     let mut start_frame = Instant::now();
 
-    loop {
-        let (running, resized) = handle_events(&mut event_loop);
+    event_loop.run(move |event, _, control_flow| {
+        match event {
+            Event::WindowEvent {
+                event: WindowEvent::CloseRequested,
+                ..
+            } => {
+                *control_flow = ControlFlow::Exit;
+            }
+            Event::WindowEvent {
+                event: WindowEvent::Resized(_),
+                ..
+            } => {
+                recreate_swapchain = true;
+            },
+            Event::WindowEvent {
+                // Note this deeply nested pattern match
+                event: WindowEvent::KeyboardInput {
+                    input:winit::event::KeyboardInput {
+                        // Which serves to filter out only events we actually want
+                        virtual_keycode:Some(keycode),
+                        state,
+                        ..
+                    },
+                    ..
+                },
+                ..
+            } => {
+                // It also binds these handy variable names!
+                match state {
+                    winit::event::ElementState::Pressed => {
+                        // VirtualKeycode is an enum with a defined representation
+                        now_keys[keycode as usize] = true;
+                    },
+                    winit::event::ElementState::Released => {
+                        now_keys[keycode as usize] = false;
+                    }
+                }
+            },
+            Event::RedrawEventsCleared => {
+                let elapsed = (Instant::now() - start_frame).as_secs_f32();
 
-        if !running {
-            break;
+                // Do not draw the frame when the screen dimensions are zero. On Windows, this can
+                // occur when minimizing the application.
+                let window = surface.object().unwrap().downcast_ref::<Window>().unwrap();
+                let dimensions = window.inner_size();
+                if dimensions.width == 0 || dimensions.height == 0 {
+                    return;
                 }
 
-        if resized || recreate_swapchain {
+                // It is important to call this function from time to time, otherwise resources
+                // will keep accumulating and you will eventually reach an out of memory error.
+                // Calling this function polls various fences in order to determine what the GPU
+                // has already processed, and frees the resources that are no longer needed.
+                previous_frame_end.as_mut().unwrap().cleanup_finished();
+
+                // Whenever the window resizes we need to recreate everything dependent on the
+                // window size. In this example that includes the swapchain, the framebuffers and
+                // the dynamic state viewport.
+                if recreate_swapchain {
+                    // Use the new dimensions of the window.
+
                     let (new_swapchain, new_images) =
                         match swapchain.recreate(SwapchainCreateInfo {
-                    //image_extent: dimensions.into(),
+                            image_extent: dimensions.into(),
                             ..swapchain.create_info()
                         }) {
                             Ok(r) => r,
@@ -164,29 +217,14 @@ pub fn init() {
                     // recreate framebuffers as well.
                     framebuffers = window_size_dependent_setup(
                         &new_images,
-                &render_pass,
+                        render_pass.clone(),
                         &mut viewport,
                         &mut pathtracer
                     );
+
                     recreate_swapchain = false;
                 }
 
-        let elapsed = (Instant::now() - start_frame).as_secs_f32();
-
-        // Do not draw the frame when the screen dimensions are zero. On Windows, this can
-        // occur when minimizing the application.
-        let window = surface.object().unwrap().downcast_ref::<Window>().unwrap();
-        let dimensions = window.inner_size();
-        if dimensions.width == 0 || dimensions.height == 0 {
-            return;
-        }
-
-        // It is important to call this function from time to time, otherwise resources
-        // will keep accumulating and you will eventually reach an out of memory error.
-        // Calling this function polls various fences in order to determine what the GPU
-        // has already processed, and frees the resources that are no longer needed.
-        previous_frame_end.as_mut().unwrap().cleanup_finished();
-
                 // Before we can draw on the output, we have to *acquire* an image from the
                 // swapchain. If no image is available (which happens if you submit draw commands
                 // too quickly), then the function will block. This operation returns the index of
@@ -253,43 +291,15 @@ pub fn init() {
 
                 start_frame = Instant::now();
             }
-}
-
-
-/// Handles events and returns a `bool` indicating if we should quit.
-fn handle_events(
-    event_loop: &mut EventLoop<()>,
-) -> (bool, bool) {
-    let mut is_running = true;
-    let mut resize = false;
-
-    event_loop.run_return(|event, _, control_flow| {
-        *control_flow = ControlFlow::Wait;
-
-        match &event {
-            Event::WindowEvent { event, .. } => match event {
-                WindowEvent::CloseRequested => is_running = false,
-                WindowEvent::Resized(_) | WindowEvent::ScaleFactorChanged { .. } => {
-                    resize = true;
-                }
-                _ => (),
-            },
-            Event::MainEventsCleared => *control_flow = ControlFlow::Exit,
             _ => (),
         }
-
-        // Pass event for the app to handle our inputs.
-        // app.handle_input(renderer.window_size(), &event);
     });
-
-    (is_running, resize)
 }
 
-
 /// This function is called once during initialization, then again whenever the window is resized.
 fn window_size_dependent_setup(
     images: &[Arc<SwapchainImage>],
-    render_pass: &Arc<RenderPass>,
+    render_pass: Arc<RenderPass>,
     viewport: &mut Viewport,
     pathtracer: &mut PathtracerPipeline,
 ) -> Vec<Arc<Framebuffer>> {