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Updating a couple examples

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This commit is contained in:
Pauan
2019-06-24 18:21:12 +02:00
parent 8cb9b88acb
commit 92a464d48e
2 changed files with 22 additions and 8 deletions
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25
examples/webgl/src/lib.rs
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@ -39,12 +39,25 @@ pub fn start() -> Result<(), JsValue> {
let buffer = context.create_buffer().ok_or("failed to create buffer")?;
context.bind_buffer(WebGlRenderingContext::ARRAY_BUFFER, Some(&buffer));
let vert_array = unsafe { js_sys::Float32Array::view(&vertices) };
context.buffer_data_with_array_buffer_view(
WebGlRenderingContext::ARRAY_BUFFER,
&vert_array,
WebGlRenderingContext::STATIC_DRAW,
);
// Note that `Float32Array::view` is somewhat dangerous (hence the
// `unsafe`!). This is creating a raw view into our module's
// `WebAssembly.Memory` buffer, but if we allocate more pages for ourself
// (aka do a memory allocation in Rust) it'll cause the buffer to change,
// causing the `Float32Array` to be invalid.
//
// As a result, after `Float32Array::view` we have to be very careful not to
// do any memory allocations before it's dropped.
unsafe {
let vert_array = js_sys::Float32Array::view(&vertices);
context.buffer_data_with_array_buffer_view(
WebGlRenderingContext::ARRAY_BUFFER,
&vert_array,
WebGlRenderingContext::STATIC_DRAW,
);
}
context.vertex_attrib_pointer_with_i32(0, 3, WebGlRenderingContext::FLOAT, false, 0, 0);
context.enable_vertex_attrib_array(0);