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Fix fragment shader position references #141

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Fix fragment shader position references #141

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2 changes: 1 addition & 1 deletion exercises/frag-1/README.md
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Expand Up @@ -33,6 +33,6 @@ void main() {

Every fragment shader also receives a special input variable called `gl_FragCoord`. `gl_FragCoord` is a `vec4` which returns the coordinate of the fragment in device coordinates. Specifically:

* `gl_FragCoord.xy` is the coordinate of the fragment in units relative to the top-left of the buffer. The y-component is the row of the fragment, and the x-coordinate is the column.
* `gl_FragCoord.xy` is the coordinate of the fragment in units relative to the bottom-left of the buffer. The y-component is the row of the fragment, and the x-coordinate is the column.
* `gl_FragCoord.z` is the depth value of the fragment, in units between `[0,1]`, where `0` represents the closest possible z value and `1` represents the farthest possible z-value.
* `gl_FragCoord.w` is the reciprocal of the homogeneous part of the fragment's position in clip coordinates