Allow declare the shader arrays with a size defined before identifier #53527
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This is mostly syntax sugar, but it's possible (in GLSL) to declare an array with the size defined before identifier eg:
int[2] arr;
instead ofint arr[2];
This PR makes it possible. To decrease code repetition - I've pushed the index parsing to a separate function.Note: It's already possible to do for varying/uniform arrays, this PR is for local arrays in functions and struct members.