initial commit

src/utils.rs

@@ -0,0 +1,45 @@
+use glad_gl::gl;
+use glm;
+use anyhow::{Result, Context};
+
+pub fn load_texture(path: &str) -> Result<u32> {
+    let tex = image::io::Reader::open(path)
+        .with_context(|| format!("Failed to open texture file: {}", path))?
+        .decode()
+        .with_context(|| format!("Failed to decode texture: {}", path))?;
+
+    let mut texture_id: u32 = 0;
+    let format = match tex.color().channel_count() {
+        1 => gl::RED,
+        2 => gl::RG,
+        3 => gl::RGB,
+        4 => gl::RGBA,
+        _ => panic!("Unknown image format")
+    };
+
+    unsafe {
+        gl::GenTextures(1, &mut texture_id);
+        gl::BindTexture(gl::TEXTURE_2D, texture_id);
+
+        gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_MIN_FILTER, gl::LINEAR_MIPMAP_LINEAR as i32);
+        gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_MAG_FILTER, gl::LINEAR as i32);
+
+        gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_WRAP_S, gl::REPEAT as i32);
+        gl::TexParameteri(gl::TEXTURE_2D, gl::TEXTURE_WRAP_T, gl::REPEAT as i32);
+
+        gl::TexImage2D(gl::TEXTURE_2D, 0, format as i32, tex.width() as i32, tex.height() as i32, 0, format, gl::UNSIGNED_BYTE, tex.as_bytes().as_ptr() as *const std::ffi::c_void);
+        gl::GenerateMipmap(gl::TEXTURE_2D);
+    }
+
+    Ok(texture_id)
+}
+
+pub fn mat_ident() -> glm::Mat4 {
+    glm::mat4(
+        1., 0., 0., 0.,
+        0., 1., 0., 0.,
+        0., 0., 1., 0.,
+        0., 0., 0., 1.
+    )
+}
+