diff options
Diffstat (limited to 'engine/src/opengl/buffer.rs')
| -rw-r--r-- | engine/src/opengl/buffer.rs | 32 |
1 files changed, 32 insertions, 0 deletions
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 |