Tour of WGSL

If Statements

For simple branching, the if statement is provided for control flow.

An if statement requires a condition, which must be a boolean.

The parenthesis are optional around the condition, the braces are required around the body.

Example

if a {
} else if (b) {
}

An if can be followed by zero or more else if blocks and a single optional else block.

Example

if a {
} else if b {
} else if c {
} else {
}

The else must come last.

const a = true;

fn executed_block() -> u32 {
  if a {
    // Will be executed.
    return 1;
  }
  return 0;
}

fn else_block() -> u32 {
  // Parenthesis are optional.
  if (!a) {
    // Will not be executed.
    return 0;
  } else {
    return 1;
  }
}

fn casted_block() -> u32 {
  if bool(1) {
    // Will be executed.
    return 1;
  }
  return 0;
}