82 lines
2.3 KiB
Rust
82 lines
2.3 KiB
Rust
// Copyright 2016 Matthew Collins
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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use std::collections::HashMap;
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#[derive(Default)]
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pub struct Registry {
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shaders: HashMap<String, String>,
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shader_version: String,
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}
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impl Registry {
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pub fn new(shader_version: &str) -> Registry {
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Registry {
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shaders: Default::default(),
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shader_version: shader_version.to_string(),
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}
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}
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pub fn register(&mut self, name: &str, source: &str) {
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if self.shaders.contains_key(name) {
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panic!("shader {} is already defined", name);
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}
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self.shaders
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.insert(name.to_owned(), source.trim().to_owned());
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}
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fn add_version(&self, out: &mut String) {
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out.push_str(&self.shader_version);
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out.push('\n');
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if self.shader_version.ends_with(" es") {
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out.push_str(
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r#"precision mediump float;
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precision mediump sampler2DArray;
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#define ES
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"#,
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);
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}
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}
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pub fn get(&self, name: &str) -> String {
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let mut out = String::new();
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self.add_version(&mut out);
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self.get_internal(&mut out, name);
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out
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}
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pub fn get_define(&self, name: &str, define: &str) -> String {
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let mut out = String::new();
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self.add_version(&mut out);
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out.push_str("#define ");
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out.push_str(define);
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out.push('\n');
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self.get_internal(&mut out, name);
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out
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}
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fn get_internal(&self, out: &mut String, name: &str) {
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let src = self.shaders.get(name).unwrap();
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for line in src.lines() {
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if let Some(stripped) = line.strip_prefix("#include ") {
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let inc = stripped.trim();
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self.get_internal(out, inc);
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continue;
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}
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out.push_str(line);
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out.push('\n');
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}
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}
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}
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