first commit

shaders/sky_sphere.wgsl

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+@group(0) @binding(0) var<uniform> viewProjectionMatrix : mat4x4<f32>;
+@group(0) @binding(1) var<uniform> cameraPosition : vec3<f32>;
+
+struct VertexOutput {
+	@builtin(position) position    : vec4<f32>,
+	@location(0) worldPosition     : vec3<f32>,
+	@location(1) worldNormal       : vec3<f32>,
+};
+
+@vertex
+fn v_main(
+	@location(0) position : vec3<f32>,
+	@location(1) normal   : vec3<f32>
+) -> VertexOutput {
+
+	var output : VertexOutput;
+
+	output.position      = viewProjectionMatrix * vec4<f32>( position, 1.0 );
+	output.worldPosition = position;
+	output.worldNormal   = normalize( normal );
+
+	return output;
+
+}
+
+struct FragmentOutput {
+	@location(0) color : vec4<f32>,
+	@builtin(frag_depth) depth : f32,
+};
+
+@fragment
+fn f_main( input : VertexOutput ) -> FragmentOutput {
+
+	let surfaceDir : vec3<f32> = normalize( input.worldPosition );
+
+	let up : vec3<f32> = vec3<f32>( 0.0, 1.0, 0.0 );
+
+	let cosAngle : f32 = clamp( dot( surfaceDir, up ), 0.0, 1.0 );
+
+	let skyZenith : vec3<f32> = vec3<f32>( 0.45, 0.78, 0.98 );
+
+	let skyHorizon : vec3<f32> = vec3<f32>( 0.12, 0.28, 0.52 );
+
+	let sunDir : vec3<f32> = normalize( vec3<f32>( -0.1, 0.97, 0.2 ) );
+
+	let sunAngle : f32 = clamp( dot( surfaceDir, sunDir ), 0.0, 1.0 );
+
+	let sunExposure : f32 = smoothstep( 0.94, 0.999, sunAngle );
+
+	let skyGradient : vec3<f32> = mix( skyHorizon, skyZenith, pow( cosAngle, 1.1 ) );
+
+	let airglow : vec3<f32> = vec3<f32>( 0.09, 0.16, 0.28 ) * pow( 1.0 - cosAngle, 3.0 );
+
+	let scattering : vec3<f32> = skyGradient + airglow;
+
+	let sunDisk : vec3<f32> = vec3<f32>( 1.0, 0.94, 0.76 ) * sunExposure * sunExposure * 1.6;
+
+	let skyColor : vec3<f32> = mix( scattering, scattering + sunDisk, sunExposure );
+
+	let horizonBlend : f32 = smoothstep( 0.0, 0.6, 1.0 - cosAngle );
+
+	let baseColor : vec3<f32> = mix( skyHorizon, skyZenith, max( cosAngle, 0.1 ) );
+
+	let color : vec3<f32> = mix( baseColor * 1.1 + vec3<f32>( 0.02, 0.03, 0.04 ), skyColor * 0.9, 1.0 - horizonBlend );
+
+	return FragmentOutput(
+
+		vec4<f32>( color, 1.0 ),
+
+		0.999
+
+	);
+
+}