From 6b2feeab0b845d05cdf76328d44b7b70a5e50c18 Mon Sep 17 00:00:00 2001
From: HampusM <hampus@hampusmat.com>
Date: Sat, 10 May 2025 13:10:46 +0200
Subject: refactor(engine): make GL renderer have it's own Vertex struct

---
 engine/src/opengl/buffer.rs | 32 ++++++++++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

(limited to 'engine/src/opengl/buffer.rs')

diff --git a/engine/src/opengl/buffer.rs b/engine/src/opengl/buffer.rs
index 2fabe4d..eded553 100644
--- a/engine/src/opengl/buffer.rs
+++ b/engine/src/opengl/buffer.rs
@@ -1,5 +1,6 @@
 use std::marker::PhantomData;
 use std::mem::size_of_val;
+use std::ptr::null;
 
 #[derive(Debug)]
 pub struct Buffer<Item>
@@ -35,6 +36,37 @@ impl<Item> Buffer<Item>
         }
     }
 
+    pub fn store_mapped<Value>(
+        &mut self,
+        values: &[Value],
+        usage: Usage,
+        mut map_func: impl FnMut(&Value) -> Item,
+    )
+    {
+        unsafe {
+            #[allow(clippy::cast_possible_wrap)]
+            gl::NamedBufferData(
+                self.buf,
+                (size_of::<Item>() * values.len()) as gl::types::GLsizeiptr,
+                null(),
+                usage.into_gl(),
+            );
+        }
+
+        for (index, value) in values.iter().enumerate() {
+            let item = map_func(value);
+
+            unsafe {
+                gl::NamedBufferSubData(
+                    self.buf,
+                    (index * size_of::<Item>()) as gl::types::GLintptr,
+                    size_of::<Item>() as gl::types::GLsizeiptr,
+                    (&raw const item).cast(),
+                );
+            }
+        }
+    }
+
     pub fn object(&self) -> gl::types::GLuint
     {
         self.buf
-- 
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