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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
use webrender::shader_source::OPTIMIZED_SHADERS;
use glsl::parser::Parse as _;
use glsl::syntax::{InterpolationQualifier, ShaderStage, SingleDeclaration};
use glsl::syntax::{TypeSpecifierNonArray, TypeQualifierSpec};
use glsl::visitor::{Host, Visit, Visitor};
/// Tests that a shader contains no flat scalar varyings.
/// These must be avoided on Adreno 3xx devices due to bug 1630356.
fn test_no_flat_scalar_varyings(name: &str, shader: &mut ShaderStage) {
struct FlatScalarVaryingsVisitor {
shader_name: String,
}
impl Visitor for FlatScalarVaryingsVisitor {
fn visit_single_declaration(&mut self, declaration: &SingleDeclaration) -> Visit {
let is_scalar = matches!(declaration.ty.ty.ty,
TypeSpecifierNonArray::Bool
| TypeSpecifierNonArray::Int
| TypeSpecifierNonArray::UInt
| TypeSpecifierNonArray::Float
| TypeSpecifierNonArray::Double);
let qualifiers = declaration
.ty
.qualifier
.as_ref()
.map(|q| q.qualifiers.0.as_slice())
.unwrap_or(&[]);
let is_flat = qualifiers.contains(&TypeQualifierSpec::Interpolation(
InterpolationQualifier::Flat,
));
assert!(
!(is_scalar && is_flat),
"{}: {} is a flat scalar varying",
self.shader_name,
&declaration.name.as_ref().unwrap()
);
Visit::Parent
}
}
let mut visitor = FlatScalarVaryingsVisitor {
shader_name: name.to_string(),
};
shader.visit(&mut visitor);
}
pub fn test_shaders() {
for ((_version, name), shader) in OPTIMIZED_SHADERS.iter() {
let mut vert = ShaderStage::parse(shader.vert_source).unwrap();
let mut frag = ShaderStage::parse(shader.frag_source).unwrap();
if cfg!(target_os = "android") {
test_no_flat_scalar_varyings(&format!("{}.vert", name), &mut vert);
test_no_flat_scalar_varyings(&format!("{}.frag", name), &mut frag);
}
}
}
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