LOTS of unsafe later... got my black triangle.

src/main.rs

@@ -1,8 +1,9 @@
 use sdl2::event::Event;
 use sdl2::keyboard::Keycode;
 
+use std::collections::HashMap;
 use std::convert::TryInto;
-use std::ffi::{CStr, CString};
+use std::ffi::{c_void, CStr, CString};
 use std::time::Duration;
 
 const VERT_SHADER_SRC: &str = 
@@ -164,6 +165,13 @@ impl ShaderProgram {
 			gl::GetUniformLocation (self.id, name.as_ptr ())
 		}
 	}
+	
+	pub fn get_attribute_location (&self, name: &CStr) -> i32 {
+		unsafe {
+			gl::UseProgram (self.id);
+			gl::GetAttribLocation (self.id, name.as_ptr ())
+		}
+	}
 }
 
 impl Drop for ShaderProgram {
@@ -210,11 +218,66 @@ fn main () {
 	
 	let shader_program = ShaderProgram::new (&vert_shader, &frag_shader).unwrap ();
 	
-	let uni_model = shader_program.get_uniform_location (&CString::new ("uni_model").unwrap ());
-	let uni_viewproj = shader_program.get_uniform_location (CStr::from_bytes_with_nul (b"uni_viewproj\0").unwrap ());
+	let unis: HashMap <_, _> = vec! [
+		"model",
+		"viewproj",
+	].iter ()
+	.map (|name| {
+		let mut s = String::from ("uni_");
+		s.push_str (name);
+		
+		let c_str = CString::new (s.as_bytes ()).unwrap ();
+		
+		(String::from (*name), shader_program.get_uniform_location (&c_str))
+	})
+	.collect ();
 	
-	println! ("uni_model: {}", uni_model);
-	println! ("uni_viewproj: {}", uni_viewproj);
+	println! ("uni_model: {}", unis ["model"]);
+	println! ("uni_viewproj: {}", unis ["viewproj"]);
+	
+	let attrs: HashMap <_, u32> = vec! [
+		"pos",
+		"uv",
+		//"normal",
+	].iter ()
+	.map (|name| {
+		let mut s = String::from ("attr_");
+		s.push_str (name);
+		
+		let c_str = CString::new (s.as_bytes ()).unwrap ();
+		let loc = shader_program.get_attribute_location (&c_str);
+		
+		(String::from (*name), loc.try_into ().unwrap ())
+	})
+	.collect ();
+	
+	println! ("attr_pos: {}", attrs ["pos"]);
+	
+	let tri_mesh: Vec <f32> = vec! [
+		0.0, 0.0,
+		1.0, 0.0,
+		1.0, 1.0,
+	];
+	
+	let id_mat: Vec <f32> = vec! [
+		1.0, 0.0, 0.0, 0.0,
+		0.0, 1.0, 0.0, 0.0,
+		0.0, 0.0, 1.0, 0.0,
+		0.0, 0.0, 0.0, 1.0,
+	];
+	let indexes: Vec <u16> = vec! [0, 1, 2];
+	
+	const FALSE_U8: u8 = 0;
+	
+	unsafe {
+		gl::EnableVertexAttribArray (attrs ["pos"]);
+		let stride = 4 * 2;
+		
+		gl::VertexAttribPointer (attrs ["pos"], 2, gl::FLOAT, FALSE_U8, stride, &tri_mesh [0] as *const f32 as *const c_void);
+		
+		gl::UniformMatrix4fv (unis ["viewproj"], 1, FALSE_U8, &id_mat [0]);
+		gl::UniformMatrix4fv (unis ["model"], 1, FALSE_U8, &id_mat [0]);
+	}
 	
 	let mut event_pump = sdl_context.event_pump ().unwrap ();
 	'running: loop {
@@ -235,6 +298,8 @@ fn main () {
 		unsafe {
 			gl::ClearColor (1.0f32, 0.0f32, 1.0f32, 1.0f32);
 			gl::Clear (gl::COLOR_BUFFER_BIT | gl::DEPTH_BUFFER_BIT);
+			
+			gl::DrawElements (gl::TRIANGLES, 3, gl::UNSIGNED_SHORT, &indexes [0] as *const u16 as *const c_void);
 		}
 		
 		window.gl_swap_window ();
@@ -242,4 +307,3 @@ fn main () {
 		::std::thread::sleep (Duration::from_millis (15));
 	}
 }
-