From 9718ea68dd66f497404db311768c793bcfffd3ed Mon Sep 17 00:00:00 2001
From: Piotrek <piotrek54pl@gmail.com>
Date: Sun, 25 Apr 2021 13:50:39 +0200
Subject: [PATCH] sampling in random hemisphere

---
 src/renderer/buffers/uniform_buffer.rs |   2 +-
 src/renderer/camera.rs                 |   6 +--
 src/renderer/mod.rs                    |   2 +-
 src/shaders/bin/shader.frag.spv        | Bin 11172 -> 15176 bytes
 src/shaders/raycasting.cginc           |   4 +-
 src/shaders/shader.frag                |  53 ++++++++++++++++++-------
 src/shaders/shading.cginc              |  15 +++++--
 7 files changed, 57 insertions(+), 25 deletions(-)

diff --git a/src/renderer/buffers/uniform_buffer.rs b/src/renderer/buffers/uniform_buffer.rs
index f115ee0..ef12dc7 100644
--- a/src/renderer/buffers/uniform_buffer.rs
+++ b/src/renderer/buffers/uniform_buffer.rs
@@ -10,7 +10,7 @@ pub struct UniformValues {
     cam_pos: [f32; 3],
     padding: f32,
     sun_dir: [f32; 3],
-    padding2: f32,
+    //padding2: f32,
     time: f32
 }
 
diff --git a/src/renderer/camera.rs b/src/renderer/camera.rs
index 5650760..8bbb243 100644
--- a/src/renderer/camera.rs
+++ b/src/renderer/camera.rs
@@ -14,8 +14,8 @@ impl Camera {
 
     pub fn new(aspect: f32, fov: f32) -> Self {
         Self {
-            position: (2.0, 1.0, -1.0).into(),
-            forward: (-0.66, -0.33, 0.66).into(),
+            position: (1.0, 2.0, 1.0).into(),
+            forward: (0.66, -0.25, 0.66).into(),
             up: Vector3::unit_y(),
             aspect,
             fovy: fov,
@@ -33,6 +33,6 @@ impl Camera {
     }
 
     pub fn view_matrix(&self) -> Matrix4<f32> {
-        return Matrix4::look_to_rh((0.0,0.0,0.0).into(), self.forward, self.up);
+        return Matrix4::look_to_rh((0.0,0.0,0.0).into(), self.forward.normalize(), self.up);
     }
 }
diff --git a/src/renderer/mod.rs b/src/renderer/mod.rs
index c82f271..fb1619d 100644
--- a/src/renderer/mod.rs
+++ b/src/renderer/mod.rs
@@ -33,7 +33,7 @@ impl Renderer {
             format: adapter.get_swap_chain_preferred_format(&surface),
             width: size.width,
             height: size.height,
-            present_mode: wgpu::PresentMode::Mailbox, // Fifo = Vsync
+            present_mode: wgpu::PresentMode::Fifo, // Fifo = Vsync
         };
         let swapchain = device.create_swap_chain(&surface, &swapchain_desc);
         (swapchain_desc, swapchain)
diff --git a/src/shaders/bin/shader.frag.spv b/src/shaders/bin/shader.frag.spv
index d625b253db117e5888cba26b0b64374d2edd4f23..541d11cefb4bd42d3b58c2479bcf0c23ab9c36b7 100644
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diff --git a/src/shaders/raycasting.cginc b/src/shaders/raycasting.cginc
index 1c271ae..a420473 100644
--- a/src/shaders/raycasting.cginc
+++ b/src/shaders/raycasting.cginc
@@ -55,7 +55,7 @@ HitResult castBricks(vec3 origin, vec3 start, vec3 dir, vec3 incAxis, uint addr)
 *   origin: Camera position
 *   dir: Ray coming from camera position going through currently drawn pixel
 */
-HitResult castNodes(Ray ray)
+HitResult castNodes(Ray ray, uint maxSteps)
 {
     // Round input pos to nearest voxel
     vec3 pos = floor(ray.origin);
@@ -70,7 +70,7 @@ HitResult castNodes(Ray ray)
     vec3 incAxis = vec3(0,0,0);
 
     // Iterate
-    for(int i=0;i<110;i++)
+    for(int i=0;i<maxSteps;i++)
     {
         // Get node
         uint node = texelFetch(_NodesTexture, ivec3(pos), 0).r;
diff --git a/src/shaders/shader.frag b/src/shaders/shader.frag
index 267be7e..0a443ca 100644
--- a/src/shaders/shader.frag
+++ b/src/shaders/shader.frag
@@ -37,30 +37,55 @@ float random(float s) {
     return fract(sin(seed++ + s)*43758.5453123); 
 }
 
-void main() 
+vec3 randomHemisphere(vec3 dir)
 {
-    // Black by default
-    out_color = vec4(0,0,0,1);
+    vec3 uu = normalize(cross(dir, vec3(0.0,1.0,1.0)));
+    vec3 vv = cross(uu, dir);
+	
+    vec2 rv2 = vec2(random(1), random(2));
 
+	float ra = sqrt(rv2.y);
+	float rx = ra*cos(6.2831*rv2.x); 
+	float ry = ra*sin(6.2831*rv2.x);
+	float rz = sqrt(1.0-rv2.y);
+	vec3  rr = vec3(rx*uu + ry*vv + rz*dir );
+
+    return normalize(rr);
+}
+
+vec3 solve()
+{
     // Calculate ray direction
     vec3 view_dir = (_ProjMatrixInv * vec4(vert_uv, 0, 1)).xyz;
     vec3 rayDir = normalize(_ViewMatrix * vec4(view_dir,0)).xyz;
     Ray primaryRay = Ray(_CamPos, rayDir);
 
     // Raycast
-    HitResult primary = castNodes(primaryRay);
+    HitResult primary = castNodes(primaryRay, 100);
     if(primary.data > 0)
     {
-        out_color = vec4(applyLighting(primary.pos, primaryRay.dir, primary.normal, primary.data), 1.0);
+        vec3 color = applyLighting(primary.pos, primaryRay.dir, primary.normal, primary.data);
+        vec3 hitPos = primary.pos-primaryRay.dir*0.000001;
 
-        Ray shadowRay =  Ray(primary.pos-primaryRay.dir*0.000001, _SunDir);
-        HitResult shadow = castNodes(shadowRay);
-        if(shadow.data > 0) out_color *= 0.1;
-    }
-    else
-    {
-        float up = clamp(dot(primaryRay.dir, vec3(0, 1, 0)) + 0.1, 0, 1);
-        vec3 sky = vec3(0.176, 0.592, 0.901) * up;
-        out_color = vec4(sky, 1.0);
+        // Shadow ray
+        Ray shadowRay = Ray(hitPos, _SunDir);
+        HitResult shadow = castNodes(shadowRay, 50);
+        if(shadow.data > 0) color *= 0.1;
+
+        // Secondary ray
+        Ray secondRay = Ray(hitPos, randomHemisphere(primary.normal));
+        HitResult second = castNodes(secondRay, 25);
+        if(second.data > 0) color += getAlbedo(second.data) * 0.8;
+
+        return color;
     }
+
+    float up = clamp(dot(primaryRay.dir, vec3(0, 1, 0)) + 0.1, 0, 1);
+    return vec3(0.176, 0.592, 0.901) * up;
+}
+
+void main() 
+{
+    seed = 420 * vert_uv.x + 1337 * vert_uv.y + _Time * 1234;
+    out_color = vec4(solve(), 1);
 }
\ No newline at end of file
diff --git a/src/shaders/shading.cginc b/src/shaders/shading.cginc
index 2d8c021..6208bba 100644
--- a/src/shaders/shading.cginc
+++ b/src/shaders/shading.cginc
@@ -1,18 +1,25 @@
+/*
+*   Returns material albedo for given voxel
+*/
+vec3 getAlbedo(uint data)
+{
+    return _Materials[data-1].albedo.rgb;
+}
+
 /*
     point: Hit point
     view: View vector (camera ray)
     normal: Normal vector
 */
-vec3 applyLighting(vec3 hitPoint, vec3 view, vec3 normal, uint brick)
+vec3 applyLighting(vec3 hitPoint, vec3 view, vec3 normal, uint data)
 {
     // Lighting
-    vec3 light_color = vec3(1.0, 1.0, 1.0);
+    vec3 light_color = vec3(1);
 
     vec3 ambient = light_color * 0.1;
     vec3 diffuse = light_color * max(1.0-dot(normal, _SunDir), 0.0);
     vec3 specular = light_color * pow(max(dot(view, reflect(_SunDir, normal)), 0.0), 32);
 
     // Combine colors
-    vec3 object_color = _Materials[brick-1].albedo.rgb;//vec3(0.0, 0.1, 0.5);
-    return (ambient + diffuse + specular) * object_color;
+    return (ambient + diffuse + specular) * getAlbedo(data);
 }
\ No newline at end of file