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assets/shaders/lighting.nzsl

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+[nzsl_version("1.0")]
+module;
+
+import Engine.ViewerData;
+
+[layout(std140)]
+struct PointLight
+{
+	color: vec3[f32],
+	position: vec3[f32],
+
+	radius: f32,
+	invRadius: f32,
+}
+
+[layout(std140)]
+struct SpotLight
+{
+	transformMatrix: mat4[f32],
+
+	color: vec3[f32],
+	position: vec3[f32],
+	direction: vec3[f32],
+
+	radius: f32,
+	invRadius: f32,
+
+	innerAngle: f32,
+	outerAngle: f32
+}
+
+[set(0)]
+external
+{
+	[binding(0)] viewerData: uniform[ViewerData],
+	[binding(1)] colorTexture: sampler2D[f32],
+	[binding(2)] normalTexture: sampler2D[f32],
+	[binding(3)] positionTexture: sampler2D[f32],
+}
+
+[set(1)]
+external
+{
+	[binding(0)] lightParameters: uniform[SpotLight],
+}
+
+struct FragIn
+{
+	[builtin(fragcoord)] fragcoord: vec4[f32]
+}
+
+struct FragOut
+{
+	[location(0)] color: vec4[f32]
+}
+
+struct VertIn
+{
+	[location(0)] pos: vec3[f32]
+}
+
+struct VertOut
+{
+	[builtin(position)] position: vec4[f32]
+}
+
+[entry(frag)]
+fn main(input: FragIn) -> FragOut
+{
+	let fragcoord = input.fragcoord.xy * viewerData.invRenderTargetSize;
+	let normal = normalTexture.Sample(fragcoord).xyz * 2.0 - vec3[f32](1.0, 1.0, 1.0);
+	let position = positionTexture.Sample(fragcoord).xyz;
+
+	let attenuation = compute_attenuation(position, normal);
+
+	let output: FragOut;
+	output.color = vec4[f32](lightParameters.color, 1.0) * attenuation * colorTexture.Sample(fragcoord);
+
+	return output;
+}
+
+[entry(vert)]
+fn main(input: VertIn) -> VertOut
+{
+	let output: VertOut;
+	output.position = viewerData.projectionMatrix * viewerData.viewMatrix * lightParameters.transformMatrix * vec4[f32](input.pos, 1.0);
+
+	return output;
+}
+
+fn compute_attenuation(worldPos: vec3[f32], normal: vec3[f32]) -> f32
+{
+	let distance = length(lightParameters.position - worldPos);
+
+	let posToLight = (lightParameters.position - worldPos) / distance;
+	let lambert = dot(normal, posToLight);
+
+	let curAngle = dot(lightParameters.direction, -posToLight);
+	let innerMinusOuterAngle = lightParameters.innerAngle - lightParameters.outerAngle;
+
+	let attenuation = max(1.0 - distance * lightParameters.invRadius, 0.0);
+	attenuation = attenuation * lambert * max((curAngle - lightParameters.outerAngle) / innerMinusOuterAngle, 0.0);
+
+	return attenuation;
+}