Thu Nov 21 12:23:45 PM EST 2024 (Introduced Defferred Rendering/Shading Threshold)

assets/shaders/outline_post_process.wgsl

@@ -1,48 +1,62 @@
 #import bevy_core_pipeline::fullscreen_vertex_shader::FullscreenVertexOutput;
+#import bevy_pbr::{ rgb9e5 };
 
 struct OutlinePostProcessSettings {
 	weight: f32,
-	threshold: f32,
-    adaptive: u32,
+	normal_threshold: f32,
+    	adaptive: u32,
+	light_threshold: f32,
 }
 
 @group(0) @binding(0) var screen_texture: texture_2d<f32>;
 @group(0) @binding(1) var screen_sampler: sampler;
 @group(0) @binding(2) var normal_texture: texture_2d<f32>;
 @group(0) @binding(3) var normal_sampler: sampler;
-@group(0) @binding(4) var<uniform> settings: OutlinePostProcessSettings;
+@group(0) @binding(4) var deferred_texture: texture_2d<u32>;
+@group(0) @binding(5) var<uniform> settings: OutlinePostProcessSettings;
 
 @fragment
 fn fragment(
 	in: FullscreenVertexOutput
 ) -> @location(0) vec4<f32> {
     let screen_color = textureSample(screen_texture, screen_sampler, in.uv);
-    let outline_width = settings.weight / vec2f(textureDimensions(screen_texture)); 
+    let deferred_dimensions = textureDimensions(deferred_texture);
+    let deferred_texel = textureLoad(deferred_texture, vec2u(vec2f(deferred_dimensions) * in.uv), 0);
+    let deferred_color = vec4f(vec3f(unpack4x8unorm(deferred_texel.r).rgb), 1.0);
+    let emissive = vec4f(rgb9e5::rgb9e5_to_vec3_(deferred_texel.g), 1.0);
+    let light = screen_color / ((deferred_color) + vec4f(0.001, 0.001, 0.001, 1.0));
 
-    let uv_top = vec2f(in.uv.x, in.uv.y - outline_width.y);
-    let uv_right = vec2f(in.uv.x + outline_width.x, in.uv.y);
-    let uv_top_right = vec2f(in.uv.x + outline_width.x, in.uv.y - outline_width.y);
-
-    let normal = textureSample(normal_texture, normal_sampler, in.uv);
-    let normal_top = textureSample(normal_texture, normal_sampler, uv_top);
-    let normal_right = textureSample(normal_texture, normal_sampler, uv_right);
-    let normal_top_right = textureSample(normal_texture, normal_sampler, uv_top_right);
-
-    let delta_top = abs(normal - normal_top);
-    let delta_right = abs(normal - normal_right);
-    let delta_top_right = abs(normal - normal_top_right);
-
-    let delta_max = max(delta_top, max(delta_right, delta_top_right));
-    let delta_raw = max(delta_max.x, max(delta_max.y, delta_max.z));
-
-    // let delta_clipped = clamp((delta_raw * 2.0) - settings.threshold, 0.0, 1.0);
-    let show_outline = f32(delta_raw > settings.threshold);
-
-    var outline = vec4f(show_outline, show_outline, show_outline, 0.0);
     let luma = (0.2126 * screen_color.r + 0.7152 * screen_color.g + 0.0722 * screen_color.b);
-    if settings.adaptive != 0 && luma < 0.5 {
-        outline = outline * -1;
-    }
+    let light_luma = (0.2126 * light.r + 0.7152 * light.g + 0.0722 * light.b);
+    let emissive_luma = (0.2126 * emissive.r + 0.7152 * emissive.g + 0.0722 * emissive.b);
+    let final_luma = luma + light_luma + emissive_luma;
 
-    return screen_color - outline;
+	if final_luma > settings.light_threshold {
+	    let outline_width = settings.weight / vec2f(textureDimensions(screen_texture)); 
+
+	    let uv_top = vec2f(in.uv.x, in.uv.y - outline_width.y);
+	    let uv_right = vec2f(in.uv.x + outline_width.x, in.uv.y);
+	    let uv_top_right = vec2f(in.uv.x + outline_width.x, in.uv.y - outline_width.y);
+
+	    let normal = textureSample(normal_texture, normal_sampler, in.uv);
+	    let normal_top = textureSample(normal_texture, normal_sampler, uv_top);
+	    let normal_right = textureSample(normal_texture, normal_sampler, uv_right);
+	    let normal_top_right = textureSample(normal_texture, normal_sampler, uv_top_right);
+
+	    let normal_delta_top = abs(normal - normal_top);
+	    let normal_delta_right = abs(normal - normal_right);
+	    let normal_delta_top_right = abs(normal - normal_top_right);
+
+	    let normal_delta_max = max(normal_delta_top, max(normal_delta_right, normal_delta_top_right));
+	    let normal_delta_raw = max(normal_delta_max.x, max(normal_delta_max.y, normal_delta_max.z));
+
+	    let show_outline = f32(normal_delta_raw > settings.normal_threshold);
+
+	    var outline = vec4f(show_outline, show_outline, show_outline, 0.0);
+	    if settings.adaptive != 0 && luma < 0.5 {
+		outline = outline * -1;
+	    }
+	    return screen_color - outline + emissive;
+	}
+	return screen_color + emissive;
 }

src/components.rs

@@ -11,28 +11,32 @@ pub struct OutlinePostProcessSettings {
     weight: f32,
     /// A threshold for normal differences, values below this threshold will not become outlines.
     /// Higher values will result in more outlines which may look better on smooth surfaces.
-    threshold: f32,
+    normal_threshold: f32,
     /// Whether to use adaptive outlines. White outlines will be drawn around darker objects, while black ones will be drawn around lighter ones.
     adaptive: u32,
+    /// Threshold of illumination for outlines to apply. Requires deferred prepass.
+    light_threshold: f32,
 }
 
 impl OutlinePostProcessSettings {
     /// Create a new instance with the given settings
-    pub fn new(weight: f32, threshold: f32, adaptive: bool) -> Self {
+    pub fn new(weight: f32, normal_threshold: f32, adaptive: bool, light_threshold: f32) -> Self {
         Self {
             weight,
-            threshold,
+            normal_threshold,
             adaptive: adaptive as u32,
+            light_threshold,
         }
-    }    
+    }
 }
 
 impl Default for OutlinePostProcessSettings {
     fn default() -> Self {
-        Self { 
+        Self {
             weight: 1.0,
-            threshold: 0.0,
-            adaptive: 0
+            normal_threshold: 0.0,
+            adaptive: 0,
+            light_threshold: 0.0,
         }
     }
-}
+}

src/nodes.rs

@@ -57,6 +57,11 @@ impl ViewNode for OutlineRenderNode {
             return Ok(());
         };
 
+        let Some(deferred_buffer_view) = view_prepass_textures.deferred_view() else {
+            error!("Failed to get deferred buffer view");
+            return Ok(());
+        };
+
         let post_process = view_target.post_process_write();
 
         let bind_group = render_context.render_device().create_bind_group(
@@ -67,6 +72,7 @@ impl ViewNode for OutlineRenderNode {
                 &render_pipeline.screen_sampler,
                 normal_buffer_view,
                 &render_pipeline.normal_sampler,
+                deferred_buffer_view,
                 uniform_binding,
             )),
         );

src/resources.rs

@@ -37,6 +37,7 @@ impl FromWorld for OutlinePostProcessPipeline {
                     sampler(SamplerBindingType::Filtering),
                     texture_2d(TextureSampleType::Float { filterable: true }),
                     sampler(SamplerBindingType::Filtering),
+                    texture_2d(TextureSampleType::Uint),
                     uniform_buffer::<components::OutlinePostProcessSettings>(false),
                 ),
             ),