Function executionMode [src]

Declare the mode entry point executes in.

Prototype

pub fn executionMode(comptime entry_point: anytype, comptime mode: ExecutionMode) void

Parameters

mode: ExecutionMode

Source

  pub fn executionMode(comptime entry_point: anytype, comptime mode: ExecutionMode) void {
    const cc = @typeInfo(@TypeOf(entry_point)).@"fn".calling_convention;
    switch (mode) {
        .origin_upper_left,
        .origin_lower_left,
        .depth_replacing,
        .depth_greater,
        .depth_less,
        .depth_unchanged,
        => {
            if (cc != .spirv_fragment) {
                @compileError(
                    \\invalid execution mode '
                ++ @tagName(mode) ++
                    \\' for function with '
                ++ @tagName(cc) ++
                    \\' calling convention
                );
            }
            asm volatile (
                \\OpExecutionMode %entry_point $mode
                :
                : [entry_point] "" (entry_point),
                  [mode] "c" (@intFromEnum(mode)),
            );
        },
        .local_size => |size| {
            if (cc != .spirv_kernel) {
                @compileError(
                    \\invalid execution mode 'local_size' for function with '
                ++ @tagName(cc) ++
                    \\' calling convention
                );
            }
            asm volatile (
                \\OpExecutionMode %entry_point LocalSize $x $y $z
                :
                : [entry_point] "" (entry_point),
                  [x] "c" (size.x),
                  [y] "c" (size.y),
                  [z] "c" (size.z),
            );
        },
    }
}  