FragCoord(3)

Name

FragCoord - Coordinates of the fragment

FragCoord: Decorating a variable with the FragCoord built-in decoration will make that variable contain the coordinates (x,y,z,1/w) of the fragment being processed.

The (x,y) values are the framebuffer coordinates (x_f,y_f) of the fragment.

When Sample Shading is enabled, the x and y components of FragCoord reflect the location of one of the samples corresponding to the shader invocation.

Otherwise, the x and y components of FragCoord reflect the location of the center of the fragment.

The z component of FragCoord is the interpolated depth value of the primitive.

The w component is the interpolated .

The Centroid interpolation decoration is ignored, but allowed, on FragCoord.

Valid Usage

VUID-FragCoord-FragCoord-04210
The FragCoord decoration must be used only within the Fragment Execution Model
VUID-FragCoord-FragCoord-04211
The variable decorated with FragCoord must be declared using the Input Storage Class
VUID-FragCoord-FragCoord-04212
The variable decorated with FragCoord must be declared as a four-component vector of 32-bit floating-point values

For more information, see the Vulkan Specification (NOTE: cannot determine Specification page containing this refpage).

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.