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|
use crate::asset::Handle as AssetHandle;
use crate::image::Image;
use crate::matrix::Matrix;
use crate::shader::{TypeKind, TypeLayout, VariableLayout};
use crate::vector::Vec3;
/// Shader cursor
#[derive(Clone)]
pub struct Cursor<'a>
{
type_layout: TypeLayout<'a>,
binding_location: BindingLocation,
}
impl<'a> Cursor<'a>
{
pub fn new(var_layout: VariableLayout<'a>) -> Self
{
let binding_location = BindingLocation {
binding_index: var_layout.binding_index(),
binding_size: 0,
byte_offset: var_layout.offset(),
};
Self {
type_layout: var_layout.type_layout().unwrap(),
binding_location,
}
}
pub fn field(&self, name: &str) -> Self
{
let Some(field_var_layout) = self.type_layout.get_field_by_name(name) else {
panic!("Field '{name}' does not exist");
};
let field_type_kind = field_var_layout.ty().unwrap().kind();
let field_var_layout = match field_type_kind {
TypeKind::ConstantBuffer => field_var_layout
.type_layout()
.expect("Constant buffer field has no type layout")
.element_var_layout()
.expect("Constant buffer field type layout has no element var layout"),
TypeKind::Array
| TypeKind::Matrix
| TypeKind::Scalar
| TypeKind::Vector
| TypeKind::Struct
| TypeKind::Resource => field_var_layout,
type_kind => unimplemented!("Type kind {type_kind:?} is not yet supported"),
};
Self {
type_layout: field_var_layout.type_layout().unwrap(),
binding_location: BindingLocation {
binding_index: self.binding_location.binding_index
+ field_var_layout.binding_index(),
binding_size: if field_type_kind == TypeKind::ConstantBuffer {
field_var_layout
.type_layout()
.unwrap()
.uniform_size()
.unwrap()
} else {
self.binding_location.binding_size
},
byte_offset: self.binding_location.byte_offset
+ field_var_layout.offset(),
},
}
}
pub fn element(mut self, index: usize) -> Self
{
let element_type_layout = self.type_layout.element_type_layout().unwrap();
self.binding_location.byte_offset += index * element_type_layout.stride();
self.type_layout = element_type_layout;
self
}
pub fn with_field(self, name: &str, func: impl FnOnce(Self) -> Self) -> Self
{
let _ = func(self.field(name));
self
}
pub fn binding_location(&self) -> &BindingLocation
{
&self.binding_location
}
pub fn into_binding_location(self) -> BindingLocation
{
self.binding_location
}
}
#[derive(Debug, Clone)]
pub struct BindingLocation
{
pub binding_index: u32,
pub binding_size: usize,
pub byte_offset: usize,
}
#[derive(Debug, Clone)]
pub enum BindingValue
{
Uint(u32),
Int(i32),
Float(f32),
FVec3(Vec3<f32>),
FMat4x4(Matrix<f32, 4, 4>),
Texture(AssetHandle<Image>),
}
impl From<u32> for BindingValue
{
fn from(value: u32) -> Self
{
BindingValue::Uint(value)
}
}
impl From<i32> for BindingValue
{
fn from(value: i32) -> Self
{
BindingValue::Int(value)
}
}
impl From<f32> for BindingValue
{
fn from(value: f32) -> Self
{
BindingValue::Float(value)
}
}
impl From<Vec3<f32>> for BindingValue
{
fn from(vec: Vec3<f32>) -> Self
{
BindingValue::FVec3(vec)
}
}
impl From<Matrix<f32, 4, 4>> for BindingValue
{
fn from(matrix: Matrix<f32, 4, 4>) -> Self
{
BindingValue::FMat4x4(matrix)
}
}
|
