Additional resources from the Raylib repo.

Examples/resources/shaders/glsl100/depth_render.fs

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+#version 100
+
+precision mediump float;
+
+// Input vertex attributes (from vertex shader)
+varying vec2 fragTexCoord;
+
+// Input uniform values
+uniform sampler2D depthTexture;
+uniform bool flipY;
+
+float nearPlane = 0.1;
+float farPlane = 100.0;
+
+void main()
+{
+    // Handle potential Y-flipping
+    vec2 texCoord = fragTexCoord;
+    if (flipY) texCoord.y = 1.0 - texCoord.y;
+
+    // Sample depth texture
+    float depth = texture2D(depthTexture, texCoord).r;
+
+    // Linearize depth
+    float linearDepth = (2.0*nearPlane)/(farPlane + nearPlane - depth*(farPlane - nearPlane));
+
+    // Output final color
+    gl_FragColor = vec4(vec3(linearDepth), 1.0);
+}