40a56bf165
Most use cases are internal so at least for the runtime consumers there's no API change, but preset parsing and reflection items are public API so might as well put this as part of 0.4.0
149 lines
5 KiB
Rust
149 lines
5 KiB
Rust
use crate::{PreprocessError, ShaderParameter};
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use librashader_common::ImageFormat;
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use nom::bytes::complete::{is_not, tag, take_while};
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use librashader_common::map::ShortString;
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use nom::character::complete::multispace1;
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use nom::number::complete::float;
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use nom::sequence::delimited;
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use nom::IResult;
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use std::str::FromStr;
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#[derive(Debug)]
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pub(crate) struct ShaderMeta {
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pub(crate) format: ImageFormat,
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pub(crate) parameters: Vec<ShaderParameter>,
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pub(crate) name: Option<ShortString>,
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}
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fn parse_parameter_string(input: &str) -> Result<ShaderParameter, PreprocessError> {
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fn parse_parameter_string_name(input: &str) -> IResult<&str, (&str, &str)> {
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let (input, _) = tag("#pragma parameter ")(input)?;
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let (input, name) = take_while(|c| c != ' ' && c != '\t')(input)?;
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let (input, _) = multispace1(input)?;
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let (input, description) = delimited(tag("\""), is_not("\""), tag("\""))(input)?;
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let (input, _) = multispace1(input)?;
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Ok((input, (name, description)))
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}
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fn parse_parameter_string_inner<'a, 'b>(
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name: &'a str,
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description: &'a str,
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input: &'b str,
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) -> IResult<&'b str, ShaderParameter> {
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let (input, initial) = float(input)?;
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let (input, _) = multispace1(input)?;
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let (input, minimum) = float(input)?;
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let (input, _) = multispace1(input)?;
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let (input, maximum) = float(input)?;
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let (input, _) = multispace1(input)?;
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let (input, step) = float(input)?;
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Ok((
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input,
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ShaderParameter {
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id: name.into(),
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description: description.to_string(),
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initial,
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minimum,
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maximum,
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step,
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},
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))
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}
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let Ok((params, (name, description))) = parse_parameter_string_name(input) else {
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return Err(PreprocessError::PragmaParseError(input.to_string()));
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};
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// some shaders do some really funky things with their pragmas so we need to be lenient and ignore
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// that it can be set at all.
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if let Ok((_, param)) = parse_parameter_string_inner(name, description, params) {
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Ok(param)
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} else {
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Ok(ShaderParameter {
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id: name.into(),
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description: description.to_string(),
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initial: 0f32,
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minimum: 0f32,
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maximum: 0f32,
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step: 0f32,
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})
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}
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}
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pub(crate) fn parse_pragma_meta(source: impl AsRef<str>) -> Result<ShaderMeta, PreprocessError> {
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let source = source.as_ref();
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let mut parameters: Vec<ShaderParameter> = Vec::new();
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let mut format = ImageFormat::default();
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let mut name = None;
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for line in source.lines() {
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if line.starts_with("#pragma parameter ") {
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let parameter = parse_parameter_string(line)?;
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if let Some(existing) = parameters.iter().find(|&p| p.id == parameter.id) {
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if existing != ¶meter {
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return Err(PreprocessError::DuplicatePragmaError(parameter.id));
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}
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} else {
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parameters.push(parameter);
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}
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}
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if let Some(format_string) = line.strip_prefix("#pragma format ") {
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if format != ImageFormat::Unknown {
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return Err(PreprocessError::DuplicatePragmaError(line.into()));
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}
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let format_string = format_string.trim();
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format = ImageFormat::from_str(format_string)?;
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if format == ImageFormat::Unknown {
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return Err(PreprocessError::UnknownImageFormat);
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}
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}
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if line.starts_with("#pragma name ") {
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if name.is_some() {
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return Err(PreprocessError::DuplicatePragmaError(line.into()));
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}
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name = Some(ShortString::from(line.trim()))
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}
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}
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Ok(ShaderMeta {
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name,
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format,
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parameters,
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})
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}
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#[cfg(test)]
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mod test {
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use crate::pragma::parse_parameter_string;
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use crate::ShaderParameter;
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#[test]
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fn parses_parameter_pragma() {
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assert_eq!(ShaderParameter {
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id: "exc".into(),
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description: "orizontal correction hack (games where players stay at center)".to_string(),
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initial: 0.0,
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minimum: -10.0,
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maximum: 10.0,
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step: 0.25
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}, parse_parameter_string(r#"#pragma parameter exc "orizontal correction hack (games where players stay at center)" 0.0 -10.0 10.0 0.25"#).unwrap())
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}
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#[test]
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fn parses_parameter_pragma_test() {
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assert_eq!(ShaderParameter {
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id: "HSM_CORE_RES_SAMPLING_MULT_SCANLINE_DIR".into(),
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description: " Scanline Dir Multiplier".to_string(),
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initial: 100.0,
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minimum: 25.0,
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maximum: 1600.0,
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step: 25.0
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}, parse_parameter_string(r#"#pragma parameter HSM_CORE_RES_SAMPLING_MULT_SCANLINE_DIR " Scanline Dir Multiplier" 100 25 1600 25"#).unwrap())
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}
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}
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