804722a1ba
Add WebGL1 and WebGL2 support to glow painter. Add "glow" feature to egui_web to use the glow painter there. Make winit an optional part of egui_glow
57 lines
1.6 KiB
Rust
57 lines
1.6 KiB
Rust
#![allow(unsafe_code)]
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use glow::HasContext;
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pub(crate) struct BufferInfo {
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pub location: u32, //
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pub vector_size: i32,
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pub data_type: u32, //GL_FLOAT,GL_UNSIGNED_BYTE
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pub normalized: bool,
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pub stride: i32,
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pub offset: i32,
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}
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pub struct EmulatedVao {
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buffer: Option<glow::Buffer>,
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buffer_infos: Vec<BufferInfo>,
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}
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impl EmulatedVao {
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pub(crate) fn new() -> Self {
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Self {
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buffer: None,
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buffer_infos: vec![],
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}
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}
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pub(crate) fn bind_buffer(&mut self, buffer: &glow::Buffer) {
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let _old = self.buffer.replace(*buffer);
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}
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pub(crate) fn add_new_attribute(&mut self, buffer_info: BufferInfo) {
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self.buffer_infos.push(buffer_info);
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}
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pub(crate) fn bind_vertex_array(&self, gl: &glow::Context) {
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unsafe {
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gl.bind_buffer(glow::ARRAY_BUFFER, self.buffer);
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}
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for attribute in self.buffer_infos.iter() {
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unsafe {
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gl.vertex_attrib_pointer_f32(
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attribute.location,
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attribute.vector_size,
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attribute.data_type,
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attribute.normalized,
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attribute.stride,
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attribute.offset,
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);
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gl.enable_vertex_attrib_array(attribute.location);
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}
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}
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}
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pub(crate) fn unbind_vertex_array(&self, gl: &glow::Context) {
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for attribute in self.buffer_infos.iter() {
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unsafe {
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gl.disable_vertex_attrib_array(attribute.location);
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}
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}
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unsafe {
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gl.bind_buffer(glow::ARRAY_BUFFER, None);
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}
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}
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}
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