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use crate::types::{RafxResourceType, RafxShaderStageFlags};
use crate::{RafxResult, RafxShaderStageDef};
use fnv::FnvHashMap;
#[cfg(feature = "serde-support")]
use serde::{Deserialize, Serialize};
#[derive(PartialEq, Eq, Hash)]
struct RafxShaderResourceBindingKey {
set: u32,
binding: u32,
}
#[derive(Debug, Clone, PartialEq, Eq, Default, Hash)]
#[cfg_attr(feature = "serde-support", derive(Serialize, Deserialize))]
pub struct RafxShaderResource {
pub resource_type: RafxResourceType,
pub set_index: u32,
pub binding: u32,
pub element_count: u32,
pub size_in_bytes: u32,
pub used_in_shader_stages: RafxShaderStageFlags,
pub name: Option<String>,
}
impl RafxShaderResource {
pub fn element_count_normalized(&self) -> u32 {
self.element_count.max(1)
}
pub fn validate(&self) -> RafxResult<()> {
if self.resource_type == RafxResourceType::ROOT_CONSTANT {
if self.element_count != 0 {
Err(
format!(
"binding (set={:?} binding={:?} name={:?} type={:?}) has non-zero element_count",
self.set_index,
self.binding,
self.name,
self.resource_type
)
)?;
}
if self.size_in_bytes == 0 {
Err(format!(
"binding (set={:?} binding={:?} name={:?} type={:?}) has zero size_in_bytes",
self.set_index, self.binding, self.name, self.resource_type
))?;
}
if self.set_index != 0 {
Err(format!(
"binding (set={:?} binding={:?} name={:?} type={:?}) has non-zero set_index",
self.set_index, self.binding, self.name, self.resource_type
))?;
}
if self.binding != 0 {
Err(format!(
"binding (set={:?} binding={:?} name={:?} type={:?}) has non-zero binding",
self.set_index, self.binding, self.name, self.resource_type
))?;
}
} else {
if self.size_in_bytes != 0 {
Err(
format!(
"binding (set={:?} binding={:?} name={:?} type={:?}) has non-zero size_in_bytes",
self.set_index,
self.binding,
self.name,
self.resource_type
)
)?;
}
}
Ok(())
}
fn binding_key(&self) -> RafxShaderResourceBindingKey {
RafxShaderResourceBindingKey {
set: self.set_index,
binding: self.binding,
}
}
fn verify_compatible_across_stages(
&self,
other: &Self,
) -> RafxResult<()> {
if self.resource_type != other.resource_type {
Err(format!(
"Pass is using shaders in different stages with different resource_type {:?} and {:?} (set={} binding={})",
self.resource_type, other.resource_type,
self.set_index,
self.binding
))?;
}
if self.element_count_normalized() != other.element_count_normalized() {
Err(format!(
"Pass is using shaders in different stages with different element_count {} and {} (set={} binding={})", self.element_count_normalized(), other.element_count_normalized(),
self.set_index, self.binding
))?;
}
if self.size_in_bytes != other.size_in_bytes {
Err(format!(
"Pass is using shaders in different stages with different size_in_bytes {} and {} (set={} binding={})",
self.size_in_bytes, other.size_in_bytes,
self.set_index, self.binding
))?;
}
Ok(())
}
}
#[derive(Debug, Clone, PartialEq)]
#[cfg_attr(feature = "serde-support", derive(Serialize, Deserialize))]
pub struct RafxShaderStageReflection {
pub shader_stage: RafxShaderStageFlags,
pub resources: Vec<RafxShaderResource>,
pub thread_count: [u32; 3],
pub entry_point_name: String,
}
#[derive(Debug)]
pub struct RafxPipelineReflection {
pub shader_stages: RafxShaderStageFlags,
pub resources: Vec<RafxShaderResource>,
}
impl RafxPipelineReflection {
pub fn from_stages(stages: &[RafxShaderStageDef]) -> RafxResult<RafxPipelineReflection> {
let mut unmerged_resources = Vec::default();
for stage in stages {
assert!(!stage.shader_stage.is_empty());
for resource in &stage.resources {
if !(resource.used_in_shader_stages - stage.shader_stage).is_empty() {
let message = format!(
"A resource in shader stage {:?} has other stages {:?} set",
stage.shader_stage,
resource.used_in_shader_stages - stage.shader_stage
);
log::error!("{}", message);
Err(message)?;
}
let mut resource = resource.clone();
resource.used_in_shader_stages |= stage.shader_stage;
unmerged_resources.push(resource);
}
}
log::trace!("Create RafxPipelineReflection from stages");
let mut all_shader_stages = RafxShaderStageFlags::empty();
for stage in stages {
if all_shader_stages.intersects(stage.shader_stage) {
Err(format!(
"Duplicate shader stage ({}) found when creating RafxPipelineReflection",
(all_shader_stages & stage.shader_stage).bits()
))?;
}
all_shader_stages |= stage.shader_stage;
}
let mut merged_resources =
FnvHashMap::<RafxShaderResourceBindingKey, RafxShaderResource>::default();
for resource in &unmerged_resources {
log::trace!(
" Resource {:?} from stage {:?}",
resource.name,
resource.used_in_shader_stages
);
let key = resource.binding_key();
if let Some(existing_resource) = merged_resources.get_mut(&key) {
existing_resource.verify_compatible_across_stages(resource)?;
log::trace!(
" Already used in stages {:?} and is compatible, adding stage {:?}",
existing_resource.used_in_shader_stages,
resource.used_in_shader_stages,
);
existing_resource.used_in_shader_stages |= resource.used_in_shader_stages;
} else {
log::trace!(
" Resource not yet used, adding it for stage {:?}",
resource.used_in_shader_stages
);
assert!(!resource.used_in_shader_stages.is_empty());
let old = merged_resources.insert(key, resource.clone());
assert!(old.is_none());
}
}
let resources = merged_resources.into_iter().map(|(_, v)| v).collect();
Ok(RafxPipelineReflection {
shader_stages: all_shader_stages,
resources,
})
}
}