feat(engine): add ability to render triangles

1 files changed, 62 insertions, 0 deletions

diff --git a/engine/src/renderer/vertex_array.rs b/engine/src/renderer/vertex_array.rs
new file mode 100644
index 0000000..e54f638
--- /dev/null
+++ b/engine/src/renderer/vertex_array.rs
@@ -0,0 +1,62 @@
+pub struct VertexArray
+{
+    array: gl::types::GLuint,
+}
+
+impl VertexArray
+{
+    pub fn new() -> Self
+    {
+        let mut array = 0;
+
+        unsafe {
+            gl::GenVertexArrays(1, &mut array);
+        }
+
+        Self { array }
+    }
+
+    pub fn draw(&self, primitive_kind: PrimitiveKind, start_index: u32, index_cnt: u32)
+    {
+        self.bind();
+
+        unsafe {
+            #[allow(clippy::cast_possible_wrap)]
+            gl::DrawArrays(
+                primitive_kind.into_gl(),
+                start_index as gl::types::GLint,
+                index_cnt as gl::types::GLsizei,
+            );
+        }
+    }
+
+    pub fn bind(&self)
+    {
+        unsafe { gl::BindVertexArray(self.array) }
+    }
+}
+
+impl Drop for VertexArray
+{
+    fn drop(&mut self)
+    {
+        unsafe {
+            gl::DeleteVertexArrays(1, &self.array);
+        }
+    }
+}
+
+pub enum PrimitiveKind
+{
+    Triangles,
+}
+
+impl PrimitiveKind
+{
+    fn into_gl(self) -> gl::types::GLenum
+    {
+        match self {
+            Self::Triangles => gl::TRIANGLES,
+        }
+    }
+}