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Fix bugs in glow on web (#1092)

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* 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.
This commit is contained in:
Emil Ernerfeldt
2022-01-10 23:19:30 +01:00
committed by GitHub
parent d5673412dd
commit 205e04aa18
8 changed files with 83 additions and 81 deletions
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36
egui_glow/src/misc_util.rs
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@@ -204,40 +204,36 @@ impl VAO {
/// If returned true no need to emulate vao
pub(crate) fn supports_vao(gl: &glow::Context) -> bool {
let web_sig = "WebGL ";
let es_sig = "OpenGL ES ";
const WEBGL_PREFIX: &str = "WebGL ";
const OPENGL_ES_PREFIX: &str = "OpenGL ES ";
let version_string = unsafe { gl.get_parameter_string(glow::VERSION) };
if let Some(pos) = version_string.rfind(web_sig) {
let version_str = &version_string[pos + web_sig.len()..];
glow_print(format!(
"detected WebGL prefix at {}:{}",
pos + web_sig.len(),
version_str
));
glow_print(format!("GL version: {:?}.", version_string));
// Examples:
// * "WebGL 2.0 (OpenGL ES 3.0 Chromium)"
// * "WebGL 2.0"
if let Some(pos) = version_string.rfind(WEBGL_PREFIX) {
let version_str = &version_string[pos + WEBGL_PREFIX.len()..];
if version_str.contains("1.0") {
//need to test OES_vertex_array_object .
// need to test OES_vertex_array_object .
gl.supported_extensions()
.contains("OES_vertex_array_object")
} else {
true
}
} else if let Some(pos) = version_string.rfind(es_sig) {
//glow targets es2.0+ so we don't concern about OpenGL ES-CM,OpenGL ES-CL
glow_print(format!(
"detected OpenGL ES prefix at {}:{}",
pos + es_sig.len(),
&version_string[pos + es_sig.len()..]
));
} else if version_string.contains(OPENGL_ES_PREFIX) {
// glow targets es2.0+ so we don't concern about OpenGL ES-CM,OpenGL ES-CL
if version_string.contains("2.0") {
//need to test OES_vertex_array_object .
// need to test OES_vertex_array_object .
gl.supported_extensions()
.contains("OES_vertex_array_object")
} else {
true
}
} else {
glow_print(format!("detected OpenGL: {:?}", version_string));
//from OpenGL 3 vao into core
// from OpenGL 3 vao into core
if version_string.starts_with('2') {
// I found APPLE_vertex_array_object , GL_ATI_vertex_array_object ,ARB_vertex_array_object
// but APPLE's and ATI's very old extension.