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Removed buffer copy from webgl example

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This commit is contained in:
David Jozis 2018-10-14 12:38:54 -04:00
parent aac8696d05
commit f408310ab7
1 changed files with 13 additions and 7 deletions
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20
examples/webgl/src/lib.rs
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@ -6,6 +6,12 @@ use wasm_bindgen::prelude::*;
use wasm_bindgen::JsCast;
use web_sys::{WebGlProgram, WebGlRenderingContext, WebGlShader};
#[wasm_bindgen]
extern {
#[wasm_bindgen(js_namespace = Reflect)]
fn get(obj: &JsValue, member: &str) -> JsValue;
}
#[wasm_bindgen]
pub fn draw() {
let document = web_sys::window().unwrap().document().unwrap();
@ -44,17 +50,17 @@ pub fn draw() {
let program = link_program(&context, [vert_shader, frag_shader].iter()).unwrap();
context.use_program(Some(&program));
let vertices = [-0.7, -0.7, 0.0, 0.7, -0.7, 0.0, 0.0, 0.7, 0.0];
let vert_array = js_sys::Float32Array::new(&wasm_bindgen::JsValue::from(vertices.len() as u32));
for (i, f) in vertices.iter().enumerate() {
vert_array.fill(*f, i as u32, (i + 1) as u32);
}
let vertices: [f32; 9] = [-0.7, -0.7, 0.0, 0.7, -0.7, 0.0, 0.0, 0.7, 0.0];
let vert_array = js_sys::Float32Array::new(&get(&wasm_bindgen::memory(), "buffer")).subarray(
&vertices as *const f32 as u32 / 4,
&vertices as *const f32 as u32 / 4 + vertices.len() as u32,
);
let buffer = context.create_buffer().unwrap();
context.bind_buffer(WebGlRenderingContext::ARRAY_BUFFER, Some(&buffer));
context.buffer_data_with_opt_array_buffer(
context.buffer_data_with_array_buffer_view(
WebGlRenderingContext::ARRAY_BUFFER,
Some(&vert_array.buffer()),
vert_array.as_ref(),
WebGlRenderingContext::STATIC_DRAW,
);
context.vertex_attrib_pointer_with_i32(0, 3, WebGlRenderingContext::FLOAT, false, 0, 0);