playcanvas/build/playcanvas/src/scene/shader-lib/wgsl/chunks/common/frag/screenDepth.js

Open-source WebGL/WebGPU 3D engine for the web

var screenDepth_default = `
var uSceneDepthMap: texture_2d<uff>;
#ifndef SCREENSIZE
	#define SCREENSIZE
	uniform uScreenSize: vec4f;
#endif
#ifndef VIEWMATRIX
	#define VIEWMATRIX
	uniform matrix_view: mat4x4f;
#endif
#ifndef LINEARIZE_DEPTH
	#define LINEARIZE_DEPTH
	#ifndef CAMERAPLANES
		#define CAMERAPLANES
		uniform camera_params: vec4f;
	#endif
	fn linearizeDepth(z: f32) -> f32 {
		if (uniform.camera_params.w == 0.0) {
			return (uniform.camera_params.z * uniform.camera_params.y) / (uniform.camera_params.y + z * (uniform.camera_params.z - uniform.camera_params.y));
		} else {
			return uniform.camera_params.z + z * (uniform.camera_params.y - uniform.camera_params.z);
		}
	}
#endif
fn delinearizeDepth(linearDepth: f32) -> f32 {
	if (uniform.camera_params.w == 0.0) {
		return (uniform.camera_params.y * (uniform.camera_params.z - linearDepth)) / (linearDepth * (uniform.camera_params.z - uniform.camera_params.y));
	} else {
		return (linearDepth - uniform.camera_params.z) / (uniform.camera_params.y - uniform.camera_params.z);
	}
}
fn getLinearScreenDepth(uv: vec2f) -> f32 {
	let textureSize = textureDimensions(uSceneDepthMap, 0);
	let texel: vec2i = vec2i(uv * vec2f(textureSize));
	#ifdef SCENE_DEPTHMAP_LINEAR
		return textureLoad(uSceneDepthMap, texel, 0).r;
	#else
		return linearizeDepth(textureLoad(uSceneDepthMap, texel, 0).r);
	#endif
}
#ifndef VERTEXSHADER
	fn getLinearScreenDepthFrag() -> f32 {
		let uv: vec2f = pcPosition.xy * uniform.uScreenSize.zw;
		return getLinearScreenDepth(uv);
	}
#endif
fn getLinearDepth(pos: vec3f) -> f32 {
	return -(uniform.matrix_view * vec4f(pos, 1.0)).z;
}
`;
export {
	screenDepth_default as default
};