wehub-resource-sync
111 lines
3.9 KiB
GLSL
111 lines
3.9 KiB
GLSL
(
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name: "PointVolumetric",
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resources: [
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(
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name: "depthSampler",
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kind: Texture(kind: Sampler2D, fallback: White),
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binding: 0
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),
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(
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name: "properties",
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kind: PropertyGroup([
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(name: "worldViewProjection", kind: Matrix4()),
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(name: "invProj", kind: Matrix4()),
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(name: "lightPosition", kind: Vector3()),
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(name: "lightColor", kind: Vector3()),
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(name: "scatterFactor", kind: Vector3()),
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(name: "intensity", kind: Float()),
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(name: "lightRadius", kind: Float()),
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]),
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binding: 0
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),
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],
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passes: [
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(
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name: "Primary",
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draw_parameters: DrawParameters(
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cull_face: None,
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color_write: ColorMask(
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red: true,
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green: true,
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blue: true,
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alpha: true,
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),
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depth_write: false,
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stencil_test: Some(StencilFunc(
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func: Equal,
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ref_value: 0xFF,
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mask: 0xFFFF_FFFF
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)),
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depth_test: None,
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blend: Some(BlendParameters(
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func: BlendFunc(
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sfactor: One,
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dfactor: One,
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alpha_sfactor: One,
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alpha_dfactor: One,
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),
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equation: BlendEquation(
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rgb: Add,
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alpha: Add
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)
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)),
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stencil_op: StencilOp(
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fail: Keep,
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zfail: Keep,
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zpass: Zero,
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write_mask: 0xFFFF_FFFF,
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),
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scissor_box: None
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),
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vertex_shader:
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r#"
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layout (location = 0) in vec3 vertexPosition;
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layout (location = 1) in vec2 vertexTexCoord;
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out vec2 texCoord;
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void main()
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{
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texCoord = vertexTexCoord;
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gl_Position = properties.worldViewProjection * vec4(vertexPosition, 1.0);
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}
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"#,
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fragment_shader:
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r#"
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out vec4 FragColor;
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in vec2 texCoord;
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void main()
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{
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vec3 fragmentPosition = S_UnProject(vec3(texCoord, texture(depthSampler, texCoord).r), properties.invProj);
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float fragmentDepth = length(fragmentPosition);
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vec3 viewDirection = fragmentPosition / fragmentDepth;
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// Find intersection
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vec3 scatter = vec3(0.0);
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float minDepth, maxDepth;
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if (S_RaySphereIntersection(vec3(0.0), viewDirection, properties.lightPosition, properties.lightRadius, minDepth, maxDepth))
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{
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// Perform depth test.
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if (minDepth > 0.0 || fragmentDepth > minDepth)
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{
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minDepth = max(minDepth, 0.0);
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maxDepth = clamp(maxDepth, 0.0, fragmentDepth);
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vec3 closestPoint = viewDirection * minDepth;
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scatter = properties.scatterFactor * S_InScatter(closestPoint, viewDirection, properties.lightPosition, maxDepth - minDepth);
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}
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}
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FragColor = vec4(properties.lightColor.xyz * pow(clamp(properties.intensity * scatter, 0.0, 1.0), vec3(2.2)), 1.0);
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}
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"#,
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)
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]
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) |