imageQuerySize

pub fn imageQuerySize(
    image: anytype,
) ImageCoordinate(std.meta.Child(@TypeOf(image)), u32)

File

Code

pub fn imageQuerySize(
    image: anytype,
) ImageCoordinate(std.meta.Child(@TypeOf(image)), u32) {
    const Image = switch (@typeInfo(@TypeOf(image))) {
        .pointer => |pointer| pointer.child,
        else => @compileError("Expected a pointer to SPIR-V image type, found '" ++ @typeName(@TypeOf(image)) ++ "'"),
    };

    const image_info = switch (@typeInfo(Image)) {
        .spirv => |spirv| switch (spirv) {
            .image => |info| info,
            else => @compileError("Expected SPIR-V image type, found '" ++ @typeName(Image) ++ "'"),
        },
        else => @compileError("Expected SPIR-V image type, found '" ++ @typeName(Image) ++ "'"),
    };

    // TODO: Remove this check if dimension is not 1d, 2d, 3d, or cube (in case buffer is added).
    if (!image_info.multisampled and image_info.usage != .unknown and image_info.usage != .storage)
        @compileError("SPIR-V image must be either be multisampled or have an unknown or storage usage");

    const Result = ImageCoordinate(std.meta.Child(@TypeOf(image)), u32);

    return asm volatile (
        \\%loaded_image = OpLoad %Image %image
        \\%ret          = OpImageQuerySize %Result %loaded_image
        : [ret] "" (-> Result),
        : [Image] "t" (Image),
          [image] "" (image),
          [Result] "t" (Result),
    );
}