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/// Trait for filter chains that allow runtime reflection of shader parameters.
pub trait FilterChainParameters {
/// Gets the number of shader passes enabled at runtime.
fn get_enabled_pass_count(&self) -> usize;
/// Sets the number of shader passes enabled at runtime.
fn set_enabled_pass_count(&mut self, count: usize);
/// Enumerates the active parameters as well as their values in the current filter chain.
fn enumerate_parameters(&self) -> std::collections::hash_map::Iter<String, f32>;
/// Get the value of the given parameter if present.
fn get_parameter(&self, parameter: &str) -> Option<f32>;
/// Set the value of the given parameter if present.
///
/// Returns `None` if the parameter did not exist, or the old value if successful.
fn set_parameter(&mut self, parameter: &str, new_value: f32) -> Option<f32>;
}
#[macro_export]
macro_rules! impl_filter_chain_parameters {
($ty:ty) => {
impl ::librashader_runtime::parameters::FilterChainParameters for $ty {
fn get_enabled_pass_count(&self) -> usize {
self.common.config.passes_enabled
}
fn set_enabled_pass_count(&mut self, count: usize) {
self.common.config.passes_enabled = count
}
fn enumerate_parameters(&self) -> ::std::collections::hash_map::Iter<String, f32> {
self.common.config.parameters.iter()
}
fn get_parameter(&self, parameter: &str) -> Option<f32> {
self.common
.config
.parameters
.get::<str>(parameter.as_ref())
.copied()
}
fn set_parameter(&mut self, parameter: &str, new_value: f32) -> Option<f32> {
if let Some(value) = self
.common
.config
.parameters
.get_mut::<str>(parameter.as_ref())
{
let old = *value;
*value = new_value;
Some(old)
} else {
None
}
}
}
};
}