Move all crates into a crates directory (#1940)

crates/egui_glow/src/misc_util.rs

@@ -0,0 +1,40 @@
+#![allow(unsafe_code)]
+
+use glow::HasContext as _;
+
+pub(crate) unsafe fn compile_shader(
+    gl: &glow::Context,
+    shader_type: u32,
+    source: &str,
+) -> Result<glow::Shader, String> {
+    let shader = gl.create_shader(shader_type)?;
+
+    gl.shader_source(shader, source);
+
+    gl.compile_shader(shader);
+
+    if gl.get_shader_compile_status(shader) {
+        Ok(shader)
+    } else {
+        Err(gl.get_shader_info_log(shader))
+    }
+}
+
+pub(crate) unsafe fn link_program<'a, T: IntoIterator<Item = &'a glow::Shader>>(
+    gl: &glow::Context,
+    shaders: T,
+) -> Result<glow::Program, String> {
+    let program = gl.create_program()?;
+
+    for shader in shaders {
+        gl.attach_shader(program, *shader);
+    }
+
+    gl.link_program(program);
+
+    if gl.get_program_link_status(program) {
+        Ok(program)
+    } else {
+        Err(gl.get_program_info_log(program))
+    }
+}