80 lines
2.2 KiB
Rust
80 lines
2.2 KiB
Rust
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#![allow(unsafe_code)]
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use crate::misc_util::glow_debug_print;
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use glow::HasContext;
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use std::convert::TryInto;
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#[derive(Copy, Clone, Debug, PartialEq, Eq)]
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#[allow(dead_code)]
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pub(crate) enum ShaderVersion {
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Gl120,
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Gl140,
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Es100,
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Es300,
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}
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impl ShaderVersion {
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pub(crate) fn get(gl: &glow::Context) -> Self {
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let shading_lang = unsafe { gl.get_parameter_string(glow::SHADING_LANGUAGE_VERSION) };
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glow_debug_print(&shading_lang);
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Self::parse(&shading_lang)
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}
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#[inline]
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pub(crate) fn parse(glsl_ver: &str) -> Self {
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let start = glsl_ver.find(|c| char::is_ascii_digit(&c)).unwrap();
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let es = glsl_ver[..start].contains(" ES ");
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let ver = glsl_ver[start..].splitn(2, ' ').next().unwrap();
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let [maj, min]: [u8; 2] = ver
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.splitn(3, '.')
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.take(2)
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.map(|x| x.parse().unwrap_or_default())
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.collect::<Vec<u8>>()
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.try_into()
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.unwrap();
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if es {
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if maj >= 3 {
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Self::Es300
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} else {
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Self::Es100
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}
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} else if maj > 1 || (maj == 1 && min >= 40) {
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Self::Gl140
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} else {
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Self::Gl120
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}
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}
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pub(crate) fn version(&self) -> &'static str {
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match self {
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Self::Gl120 => "#version 120\n",
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Self::Gl140 => "#version 140\n",
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Self::Es100 => "#version 100\n",
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Self::Es300 => "#version 300 es\n",
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}
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}
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pub(crate) fn is_new_shader_interface(&self) -> &'static str {
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match self {
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ShaderVersion::Es300 | ShaderVersion::Gl140 => "#define NEW_SHADER_INTERFACE\n",
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_ => "",
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}
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}
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}
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#[test]
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fn test_shader_version() {
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use ShaderVersion::{Es100, Es300, Gl120, Gl140};
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for (s, v) in [
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("1.2 OpenGL foo bar", Gl120),
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("3.0", Gl140),
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("0.0", Gl120),
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("OpenGL ES GLSL 3.00 (WebGL2)", Es300),
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("OpenGL ES GLSL 1.00 (WebGL)", Es100),
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("OpenGL ES GLSL ES 1.00 foo bar", Es100),
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("WebGL GLSL ES 3.00 foo bar", Es300),
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("WebGL GLSL ES 3.00", Es300),
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("WebGL GLSL ES 1.0 foo bar", Es100),
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] {
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assert_eq!(ShaderVersion::parse(s), v);
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}
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}
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