205e04aa18
* Re-add check of WEBGL_debug_renderer_info to avoid OpenGL error I removed this check in https://github.com/emilk/egui/pull/1020 because it produced a warning on Firefox. Better a warning than an OpenGL error though. * Bug fix: don't ask for webgl context and then later for webgl2 context The browser will only allow the first thing we check, so this will prevent webgl2 from working.
84 lines
2.4 KiB
Rust
84 lines
2.4 KiB
Rust
#![allow(unsafe_code)]
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use crate::misc_util::glow_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_string =
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unsafe { gl.get_parameter_string(glow::SHADING_LANGUAGE_VERSION) };
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let shader_version = Self::parse(&shading_lang_string);
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glow_print(format!(
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"Shader version: {:?} ({:?}).",
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shader_version, shading_lang_string
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));
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shader_version
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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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