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imgui-glium-renderer: stop reusing vertex/index buffers

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For some reason, index buffer recycling leads in some cases to 100% CPU
usage due to some OpenGL synchronization stuff I don't fully understand.
This commit is contained in:
Joonas Javanainen 2018-10-13 00:33:49 +03:00
parent 411a7c7514
commit cddef5ee34
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GPG Key ID: D39CCA5CB19B9179
1 changed files with 8 additions and 49 deletions
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57
imgui-glium-renderer/src/lib.rs
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@ -129,10 +129,12 @@ impl Renderer {
let (fb_width, fb_height) = fb_size;
self.device_objects
.upload_vertex_buffer(&self.ctx, draw_list.vtx_buffer)?;
self.device_objects
.upload_index_buffer(&self.ctx, draw_list.idx_buffer)?;
let vtx_buffer = VertexBuffer::immutable(&self.ctx, draw_list.vtx_buffer)?;
let idx_buffer = IndexBuffer::immutable(
&self.ctx,
PrimitiveType::TrianglesList,
draw_list.idx_buffer,
)?;
let mut idx_start = 0;
for cmd in draw_list.cmd_buffer {
@ -146,10 +148,8 @@ impl Renderer {
let idx_end = idx_start + cmd.elem_count as usize;
surface.draw(
&self.device_objects.vertex_buffer,
&self
.device_objects
.index_buffer
&vtx_buffer,
&idx_buffer
.slice(idx_start..idx_end)
.expect("Invalid index buffer range"),
&self.device_objects.program,
@ -183,8 +183,6 @@ impl Renderer {
}
pub struct DeviceObjects {
vertex_buffer: VertexBuffer<ImDrawVert>,
index_buffer: IndexBuffer<ImDrawIdx>,
program: Program,
textures: Textures<Texture2d>,
}
@ -226,9 +224,6 @@ impl DeviceObjects {
pub fn init<F: Facade>(im_gui: &mut ImGui, ctx: &F) -> RendererResult<DeviceObjects> {
use glium::texture::{ClientFormat, RawImage2d};
let vertex_buffer = VertexBuffer::empty_dynamic(ctx, 0)?;
let index_buffer = IndexBuffer::empty_dynamic(ctx, PrimitiveType::TrianglesList, 0)?;
let program = compile_default_program(ctx)?;
let texture = im_gui.prepare_texture(|handle| {
let data = RawImage2d {
@ -243,44 +238,8 @@ impl DeviceObjects {
im_gui.set_font_texture_id(textures.insert(texture));
Ok(DeviceObjects {
vertex_buffer: vertex_buffer,
index_buffer: index_buffer,
program: program,
textures: textures,
})
}
pub fn upload_vertex_buffer<F: Facade>(
&mut self,
ctx: &F,
vtx_buffer: &[ImDrawVert],
) -> RendererResult<()> {
self.vertex_buffer.invalidate();
if let Some(slice) = self.vertex_buffer.slice_mut(0..vtx_buffer.len()) {
slice.write(vtx_buffer);
return Ok(());
}
self.vertex_buffer = VertexBuffer::dynamic(ctx, vtx_buffer)?;
let _ = ctx.get_context().insert_debug_marker(&format!(
"imgui-rs: resized vertex buffer to {} bytes",
self.vertex_buffer.get_size()
));
Ok(())
}
pub fn upload_index_buffer<F: Facade>(
&mut self,
ctx: &F,
idx_buffer: &[ImDrawIdx],
) -> RendererResult<()> {
self.index_buffer.invalidate();
if let Some(slice) = self.index_buffer.slice_mut(0..idx_buffer.len()) {
slice.write(idx_buffer);
return Ok(());
}
self.index_buffer = IndexBuffer::dynamic(ctx, PrimitiveType::TrianglesList, idx_buffer)?;
let _ = ctx.get_context().insert_debug_marker(&format!(
"imgui-rs: resized index buffer to {} bytes",
self.index_buffer.get_size()
));
Ok(())
}
}