94 lines
1.8 KiB
Rust
94 lines
1.8 KiB
Rust
use std::collections::*;
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use std::iter::FromIterator;
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use crate::{
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renderable_model::AttrMap,
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shader::ShaderProgram,
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};
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pub struct ShaderClosure {
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program: ShaderProgram,
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uniforms: HashMap <u32, i32>,
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attributes: AttrMap,
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}
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pub struct BorrowedShaderVars <'a> {
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pub unis: &'a HashMap <u32, i32>,
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pub attrs: &'a AttrMap,
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}
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pub fn get_shader_attrs (
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shader: &ShaderProgram,
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attr_names: &[(usize, &str)]
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)
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-> AttrMap
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{
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let mut v = vec! [None; attr_names.iter ().map (|(i, _)| i).max ().unwrap () + 1];
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let attrs = shader.get_attribute_locations (attr_names.iter ().map (|(_, v)| v).copied ());
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for ((i, _), loc) in attr_names.iter ().zip (attrs.into_iter ()) {
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v [*i] = loc;
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}
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v
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}
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pub fn get_shader_uniforms (
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shader: &ShaderProgram,
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uni_names: &[(u32, &str)]
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)
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-> HashMap <u32, i32>
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{
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let unis = shader.get_uniform_locations (uni_names.iter ().map (|(_, v)| v).copied ());
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let pairs =
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uni_names.iter ().map (|(i, _)| i).copied ()
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.zip (unis.into_iter ())
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.filter (|(_, v)| *v >= 0)
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;
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HashMap::from_iter (pairs)
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}
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impl ShaderClosure {
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pub fn new (
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program: ShaderProgram,
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uniform_names: &[(u32, &str)],
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attr_names: &[(usize, &str)]
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) -> Self
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{
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let uniforms = get_shader_uniforms (&program, uniform_names);
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let attributes = get_shader_attrs (&program, attr_names);
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Self {
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program,
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uniforms,
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attributes,
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}
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}
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pub fn get_id (&self) -> u32 {
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self.program.get_id ()
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}
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pub fn with <F> (&self, previous_id: Option <u32>, callback: F)
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where F: Fn (BorrowedShaderVars)
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{
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if previous_id != Some (self.get_id ()) {
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self.program.use_program ();
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}
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else {
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//println! ("Elided use_program ()");
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}
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callback (BorrowedShaderVars {
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unis: &self.uniforms,
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attrs: &self.attributes,
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});
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}
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}
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pub trait ShaderLookup {
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fn lookup <'a> (&'a self, id: u32) -> &'a ShaderClosure;
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}
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