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examples/glupload: Pass actual program handle to glGetProgramiv()

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This is what you get with an untyped API.  `glGetError()` further down
the line was returning `GL_INVALID_OPERATION` and failing other calls
after `load()` in the `glutin 0.31` upgrade.  This turns out to be
[returned by `glGetProgramiv`] when the `program` that is passed in
does not refer to a program object.  Which was the case here, where the
fragment shader identifier was passed in instead.

Just in case we insert a few extra asserts that check the result of
`glGetError()` to catch such issues earlier on in the chain, instead of
postponing them and falsely accusing code that runs later.

[returned by `glGetProgramiv`]: https://registry.khronos.org/OpenGL-Refpages/es2.0/xhtml/glGetProgramiv.xml#errors

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer-rs/-/merge_requests/1336>
This commit is contained in:
Marijn Suijten 2023-11-02 22:49:44 +01:00
parent 5fdd56747f
commit 73180e530b
1 changed files with 6 additions and 3 deletions
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9
examples/src/glupload.rs
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@ -206,9 +206,10 @@ fn load(gl_context: &glutin::WindowedContext<glutin::PossiblyCurrent>) -> Gl {
gl.LinkProgram(program);
{
let mut success: gl::types::GLint = 1;
gl.GetProgramiv(fs, gl::LINK_STATUS, &mut success);
assert!(success != 0);
let mut success = 1;
gl.GetProgramiv(program, gl::LINK_STATUS, &mut success);
assert_ne!(success, 0);
assert_eq!(gl.GetError(), 0);
}
let attr_position = gl.GetAttribLocation(program, b"a_position\0".as_ptr() as *const _);
@ -279,6 +280,8 @@ fn load(gl_context: &glutin::WindowedContext<glutin::PossiblyCurrent>) -> Gl {
gl.BindBuffer(gl::ELEMENT_ARRAY_BUFFER, 0);
gl.BindBuffer(gl::ARRAY_BUFFER, 0);
assert_eq!(gl.GetError(), 0);
(
program,
attr_position,