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Handle more than 2^16 vertices in WebGL renderer

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This commit is contained in:
Emil Ernerfeldt
2019-03-12 14:43:50 +01:00
parent 0ba687f521
commit 0be9722af5
4 changed files with 95 additions and 36 deletions
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73
emigui_wasm/src/webgl.rs
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@@ -145,7 +145,7 @@ impl Painter {
pub fn paint(
&mut self,
mesh: &Mesh,
mesh: Mesh,
texture: &Texture,
pixels_per_point: f32,
) -> Result<(), JsValue> {
@@ -153,16 +153,49 @@ impl Painter {
let gl = &self.gl;
// --------------------------------------------------------------------
gl.enable(Gl::BLEND);
gl.blend_func(Gl::SRC_ALPHA, Gl::ONE_MINUS_SRC_ALPHA);
gl.use_program(Some(&self.program));
gl.active_texture(Gl::TEXTURE0);
gl.bind_texture(Gl::TEXTURE_2D, Some(&self.texture));
// --------------------------------------------------------------------
let u_screen_size_loc = gl
.get_uniform_location(&self.program, "u_screen_size")
.unwrap();
gl.uniform2f(
Some(&u_screen_size_loc),
self.canvas.width() as f32 / pixels_per_point,
self.canvas.height() as f32 / pixels_per_point,
);
let u_tex_size_loc = gl
.get_uniform_location(&self.program, "u_tex_size")
.unwrap();
gl.uniform2f(
Some(&u_tex_size_loc),
f32::from(self.tex_size.0),
f32::from(self.tex_size.1),
);
let u_sampler_loc = gl.get_uniform_location(&self.program, "u_sampler").unwrap();
gl.uniform1i(Some(&u_sampler_loc), 0);
gl.viewport(
0,
0,
self.canvas.width() as i32,
self.canvas.height() as i32,
);
gl.clear_color(0.05, 0.05, 0.05, 1.0);
gl.clear(Gl::COLOR_BUFFER_BIT);
for mesh in mesh.split_to_u16() {
self.paint_mesh(&mesh)?;
}
Ok(())
}
fn paint_mesh(&mut self, mesh: &Mesh) -> Result<(), JsValue> {
let indices: Vec<u16> = mesh.indices.iter().map(|idx| *idx as u16).collect();
let mut positions: Vec<f32> = Vec::with_capacity(2 * mesh.vertices.len());
@@ -184,6 +217,8 @@ impl Painter {
// --------------------------------------------------------------------
let gl = &self.gl;
let indices_memory_buffer = wasm_bindgen::memory()
.dyn_into::<WebAssembly::Memory>()?
.buffer();
@@ -280,36 +315,6 @@ impl Painter {
// --------------------------------------------------------------------
let u_screen_size_loc = gl
.get_uniform_location(&self.program, "u_screen_size")
.unwrap();
gl.uniform2f(
Some(&u_screen_size_loc),
self.canvas.width() as f32 / pixels_per_point,
self.canvas.height() as f32 / pixels_per_point,
);
let u_tex_size_loc = gl
.get_uniform_location(&self.program, "u_tex_size")
.unwrap();
gl.uniform2f(
Some(&u_tex_size_loc),
f32::from(self.tex_size.0),
f32::from(self.tex_size.1),
);
let u_sampler_loc = gl.get_uniform_location(&self.program, "u_sampler").unwrap();
gl.uniform1i(Some(&u_sampler_loc), 0);
gl.viewport(
0,
0,
self.canvas.width() as i32,
self.canvas.height() as i32,
);
gl.clear_color(0.05, 0.05, 0.05, 1.0);
gl.clear(Gl::COLOR_BUFFER_BIT);
gl.draw_elements_with_i32(Gl::TRIANGLES, indices.len() as i32, Gl::UNSIGNED_SHORT, 0);
Ok(())