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//! Extract information from glsl source and transpiles it to valid glsl source code.
use core::panic;
use std::borrow::Borrow;
use anyhow::{anyhow, Result};
use glsl_lang::ast::{
FunIdentifier, PreprocessorDefine, TypeQualifier, TypeSpecifier, TypeSpecifierNonArray,
};
use glsl_lang::{
ast::{
Block, Expr, Identifier, IdentifierData, LayoutQualifier, LayoutQualifierSpec, SmolStr,
StructFieldSpecifier, TranslationUnit, TypeQualifierSpec,
},
parse::{Parsable, ParseOptions},
transpiler::glsl::FormattingState,
visitor::{HostMut, Visit, VisitorMut},
};
use log::{debug, error};
use mint::{Vector2, Vector3};
use crate::{ShaderMetadata, Slider};
impl VisitorMut for ShaderMetadata {
fn visit_block(&mut self, block: &mut Block) -> Visit {
if let Some(TypeQualifierSpec::Layout(layout)) = block.qualifier.qualifiers.first() {
if let Some(LayoutQualifierSpec::Identifier(id, _)) = layout.ids.first() {
if id.content.0 == "params" {
// We got the block we searched for
for field in block.fields.iter_mut() {
if let Ok(slider) = create_slider_from_field(field) {
self.sliders.push(slider);
convert_field(field);
} else {
panic!("Invalid field");
}
}
convert_params_block(block);
}
}
}
Visit::Parent
}
fn visit_preprocessor_define(&mut self, define: &mut PreprocessorDefine) -> Visit {
if let PreprocessorDefine::ObjectLike { ident, .. } = define {
if ident.content.0.as_str() == "NUANCE_STILL_IMAGE" {
self.still_image = true;
}
}
Visit::Parent
}
fn visit_expr(&mut self, expr: &mut Expr) -> Visit {
if let Expr::Dot(expr2, ident1) = expr {
if let Expr::Variable(ident0) = expr2.as_ref() {
let slider_name = ident0.content.0.as_str();
for slider in self.sliders.iter() {
match slider {
Slider::Float {
name,
min,
max,
default,
..
} => {
if name == slider_name {
*expr = Expr::FloatConst(match ident1.content.0.as_str() {
"max" => *max,
"min" => *min,
"init" => *default,
// No . accessors on a float value
other => panic!("No such property '{}' on float param", other),
});
return Visit::Parent;
}
}
Slider::Vec2 { name, default, .. } => {
if name == slider_name {
match ident1.content.0.as_str() {
"init" => {
*expr = Expr::FunCall(
FunIdentifier::TypeSpecifier(TypeSpecifier {
ty: TypeSpecifierNonArray::Vec2,
array_specifier: None,
}),
default
.as_ref()
.iter()
.map(|it| Expr::FloatConst(*it))
.collect(),
);
}
_ => {}
}
return Visit::Parent;
}
}
Slider::Vec3 { name, default, .. } => {
if name == slider_name {
match ident1.content.0.as_str() {
"init" => {
*expr = Expr::FunCall(
FunIdentifier::TypeSpecifier(TypeSpecifier {
ty: TypeSpecifierNonArray::Vec3,
array_specifier: None,
}),
default
.as_ref()
.iter()
.map(|it| Expr::FloatConst(*it))
.collect(),
);
}
_ => {}
}
return Visit::Parent;
}
}
_ => {}
}
}
}
}
Visit::Children
}
}
pub fn create_slider_from_field(field: &StructFieldSpecifier) -> Result<Slider> {
let name = field
.identifiers
.first()
.unwrap()
.ident
.content
.0
.to_string();
//debug!("{:#?}", field);
match field.ty.ty {
// To Slider::Float
TypeSpecifierNonArray::Float => {
let mut min = 0.0;
let mut max = 1.0;
let mut init = 0.0;
if let Some(TypeQualifier { qualifiers }) = field.qualifier.as_ref() {
if let TypeQualifierSpec::Layout(LayoutQualifier { ids }) =
qualifiers.first().unwrap()
{
for qualifier in ids.iter() {
if let LayoutQualifierSpec::Identifier(id, param) = qualifier {
match id.content.0.as_str() {
"min" => {
min = param.as_ref().unwrap().coerce_const();
}
"max" => {
max = param.as_ref().unwrap().coerce_const();
}
"init" => {
init = param.as_ref().unwrap().coerce_const();
}
other => {
error!("Wrong slider setting : {}", other)
}
}
}
}
}
}
return Ok(Slider::Float {
name,
min,
max,
value: init,
default: init,
});
}
TypeSpecifierNonArray::Vec2 => {
let mut init: Vector2<f32> = Vector2::from([0.0, 0.0]);
if let Some(TypeQualifier { qualifiers }) = field.qualifier.as_ref() {
if let TypeQualifierSpec::Layout(LayoutQualifier { ids }) =
qualifiers.first().unwrap()
{
for qualifier in ids.iter() {
if let LayoutQualifierSpec::Identifier(id, param) = qualifier {
match id.content.0.as_str() {
"init" => {
if let Some(Expr::FunCall(
FunIdentifier::TypeSpecifier(TypeSpecifier { ty, .. }),
params,
)) = param.as_deref()
{
if *ty == TypeSpecifierNonArray::Vec2 && params.len() == 2 {
init = Vector2::from([
params[0].coerce_const(),
params[1].coerce_const(),
]);
continue;
}
error!("Invalid initializer !");
}
}
other => {
error!("Unsupported setting : {}", other)
}
}
} else {
error!("Invalid qualifier shared");
}
}
}
}
return Ok(Slider::Vec2 {
name,
value: init,
default: init,
});
}
// To Slider::Color if color layout qualifier is set
TypeSpecifierNonArray::Vec3 => {
let mut init: Vector3<f32> = Vector3::from([0.0, 0.0, 0.0]);
let mut color = false;
if let Some(TypeQualifier { qualifiers }) = field.qualifier.as_ref() {
if let TypeQualifierSpec::Layout(LayoutQualifier { ids }) =
qualifiers.first().unwrap()
{
for qualifier in ids.iter() {
if let LayoutQualifierSpec::Identifier(id, param) = qualifier {
match id.content.0.as_str() {
"color" => {
color = true;
}
"init" => {
if let Some(Expr::FunCall(
FunIdentifier::TypeSpecifier(TypeSpecifier { ty, .. }),
params,
)) = param.as_deref()
{
if *ty == TypeSpecifierNonArray::Vec3 && params.len() == 3 {
init = Vector3::from([
params[0].coerce_const(),
params[1].coerce_const(),
params[2].coerce_const(),
]);
continue;
}
error!("Invalid initializer !");
}
}
other => {
error!("Unsupported setting : {}", other)
}
}
} else {
error!("Invalid qualifier shared");
}
}
}
}
return Ok(if color {
Slider::Color {
name,
value: init,
default: init,
}
} else {
Slider::Vec3 {
name,
value: init,
default: init,
}
});
}
TypeSpecifierNonArray::Bool => {
let mut init = 0;
if let Some(TypeQualifier { qualifiers }) = field.qualifier.as_ref() {
if let TypeQualifierSpec::Layout(LayoutQualifier { ids }) =
qualifiers.first().unwrap()
{
for qualifier in ids.iter() {
if let LayoutQualifierSpec::Identifier(id, param) = qualifier {
match id.content.0.as_str() {
"init" => match param.as_ref().unwrap().as_ref() {
Expr::BoolConst(value) => {
init = if *value { 1 } else { 0 };
}
_ => {
error!("Expected boolean value");
}
},
other => {
error!("Wrong slider setting : {}", other);
}
}
}
}
}
}
return Ok(Slider::Bool {
name,
value: init,
default: init,
});
}
_ => {}
}
Err(anyhow!("Invalid field in params block"))
}
/// Replace the layout(params) with a predefined layout(set=?, binding=?)
pub fn convert_params_block(block: &mut Block) {
block.qualifier.qualifiers[0] = TypeQualifierSpec::Layout(LayoutQualifier {
ids: vec![
LayoutQualifierSpec::Identifier(
Identifier {
content: IdentifierData(SmolStr::new("std140")),
span: None,
},
None,
),
LayoutQualifierSpec::Identifier(
Identifier {
content: IdentifierData(SmolStr::new("set")),
span: None,
},
Some(Box::new(Expr::IntConst(1))),
),
LayoutQualifierSpec::Identifier(
Identifier {
content: IdentifierData(SmolStr::new("binding")),
span: None,
},
Some(Box::new(Expr::IntConst(0))),
),
],
});
}
/// Replace the layout(min=?, max=?) with nothing
pub fn convert_field(field: &mut StructFieldSpecifier) {
field.qualifier = None;
}
pub fn extract(source: &str) -> Result<(ShaderMetadata, String)> {
let mut metadata = ShaderMetadata::default();
// The AST
let (mut ast, _ctx) = TranslationUnit::parse_with_options(
source,
&ParseOptions {
target_vulkan: true,
source_id: 0,
allow_rs_ident: false,
}
.build(),
)?;
// Extract some ast juice
ast.visit_mut(&mut metadata);
let mut transpiled = String::new();
glsl_lang::transpiler::glsl::show_translation_unit(
&mut transpiled,
&ast,
FormattingState::default(),
)?;
Ok((metadata, transpiled))
}
trait CoerceConst<T> {
fn coerce_const(&self) -> T;
}
impl<T> CoerceConst<f32> for T
where
T: Borrow<Expr>,
{
fn coerce_const(&self) -> f32 {
match self.borrow() {
Expr::IntConst(value) => *value as f32,
Expr::UIntConst(value) => *value as f32,
Expr::FloatConst(value) => *value,
Expr::DoubleConst(value) => *value as f32,
_ => {
panic!("Not a number constant")
}
}
}
}
impl CoerceConst<f64> for Expr {
fn coerce_const(&self) -> f64 {
match self {
Expr::IntConst(value) => *value as f64,
Expr::UIntConst(value) => *value as f64,
Expr::FloatConst(value) => *value as f64,
Expr::DoubleConst(value) => *value,
_ => {
panic!("Not a number constant")
}
}
}
}
impl CoerceConst<i32> for Expr {
fn coerce_const(&self) -> i32 {
match self {
Expr::IntConst(value) => *value,
Expr::UIntConst(value) => *value as i32,
Expr::FloatConst(value) => *value as i32,
Expr::DoubleConst(value) => *value as i32,
_ => {
panic!("Not a number constant")
}
}
}
}
impl CoerceConst<u32> for Expr {
fn coerce_const(&self) -> u32 {
match self {
Expr::IntConst(value) => *value as u32,
Expr::UIntConst(value) => *value,
Expr::FloatConst(value) => *value as u32,
Expr::DoubleConst(value) => *value as u32,
_ => {
panic!("Not a number constant")
}
}
}
}