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Merge pull request #965 from djozis/master

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Removed buffer copy from webgl example
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Alex Crichton 2018-10-14 22:08:38 -05:00 committed by GitHub
commit 2b90532db5
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1 changed files with 10 additions and 7 deletions
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17
examples/webgl/src/lib.rs
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@ -5,6 +5,7 @@ extern crate web_sys;
use wasm_bindgen::prelude::*;
use wasm_bindgen::JsCast;
use web_sys::{WebGlProgram, WebGlRenderingContext, WebGlShader};
use js_sys::{WebAssembly};
#[wasm_bindgen]
pub fn draw() {
@ -44,17 +45,19 @@ 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 memory_buffer = wasm_bindgen::memory().dyn_into::<WebAssembly::Memory>().unwrap().buffer();
let vertices_location = vertices.as_ptr() as u32 / 4;
let vert_array = js_sys::Float32Array::new(&memory_buffer).subarray(
vertices_location,
vertices_location + 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);