Z prepass

shaders/voxel.wgsl

@@ -6,7 +6,8 @@ struct VertexOutput
     @location(2) cam_pos: vec3<f32>,
     @location(3) world_pos: vec3<f32>,
     @location(4) @interpolate(flat) structure_id: u32,
-    @location(5) chunk_position: vec3<f32>
+    @location(5) chunk_position: vec3<f32>,
+    @location(6) ndc: vec4<f32>
 }
 
 struct ChunkImmediate
@@ -123,6 +124,7 @@ fn chunk(@builtin(vertex_index) index: u32, @location(0) position: vec3<f32>, @l
     output.world_pos = vertex + position;
     output.structure_id = id;
     output.chunk_position = position;
+    output.ndc = output_vertex;
 
     //let output = vec4<f32>(vertex, 1.0f);
     return output;
@@ -389,6 +391,14 @@ fn fragment_prepass(in: VertexOutput) -> FragmentPrepassOutput
 @fragment
 fn fragment(in: VertexOutput) -> FragmentOutput
 {
+    let surface_depth = in.ndc.z;
+    let prepass_depth = textureSample(prepass_depth, prepass_depth_sampler, in.ndc.xy).x;
+
+    if surface_depth <= prepass_depth
+    {
+        discard;
+    }
+
     //frag_out.color = vec4<f32>(2 * 0.01 / (100. + 0.01 - depth * (100. - 0.01)));
     let ray_dir = normalize(in.world_pos - in.cam_pos);
     let interp = box_inter(in.cam_pos - in.chunk_position, ray_dir, vec3(0.), vec3(1));
@@ -401,7 +411,9 @@ fn fragment(in: VertexOutput) -> FragmentOutput
     var frag_out: FragmentOutput;
     //frag_out.color = result.color;
     frag_out.color = result.color;
-    frag_out.depth = depth;
+    //frag_out.color = vec4<f32>(smpl);
+    //frag_out.color = vec4<f32>((2. * 0.01 * 100.) / (0.01 + 100. - prepass_depth * (100. - 0.01)));
+    //frag_out.depth = depth;
     return frag_out;
 
     //return vec4<f32>(ray_origin, 1.);