GLSL get screen coordinates

The gl_FragCoord variable also contains a z-component which contains the depth ... The depth test...

gl_FragCoord = gl_Position; Listing 39.1. ... In the pixel shader, the z-value is multiplied by 1...

You can refer to chapter 2.13 “Coordinate Transformations” of OpenGL specs, and to the fact, that...

Alternatively, you can get it recover it from gl_FragCoord... In a fragment shader, gl_FragCoord ...

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