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background: avoid allocating empty layers

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Only increment the layer index if we allocated any quads into it
This commit is contained in:
Wez Furlong 2022-06-01 12:07:14 -07:00
parent 1ae72bccae
commit 749db1435d
1 changed files with 12 additions and 6 deletions
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18
wezterm-gui/src/termwindow/background.rs
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@ -374,8 +374,11 @@ impl crate::TermWindow {
top: StableRowIndex,
) -> anyhow::Result<()> {
let gl_state = self.render_state.as_ref().unwrap();
for (idx, layer) in self.window_background.iter().enumerate() {
self.render_background(gl_state, bg_color, layer, idx, top)?;
let mut layer_idx = -127;
for layer in self.window_background.iter() {
if self.render_background(gl_state, bg_color, layer, layer_idx, top)? {
layer_idx = layer_idx.saturating_add(1);
}
}
Ok(())
}
@ -385,10 +388,10 @@ impl crate::TermWindow {
gl_state: &RenderState,
bg_color: LinearRgba,
layer: &LoadedBackgroundLayer,
layer_index: usize,
layer_index: i8,
top: StableRowIndex,
) -> anyhow::Result<()> {
let render_layer = gl_state.layer_for_zindex(-127 + layer_index as i8)?;
) -> anyhow::Result<bool> {
let render_layer = gl_state.layer_for_zindex(layer_index)?;
let vbs = render_layer.vb.borrow();
let mut vb_mut0 = vbs[0].current_vb_mut();
let mut layer0 = vbs[0].map(&mut vb_mut0);
@ -529,6 +532,8 @@ impl crate::TermWindow {
let limit_y = top_pixel + pixel_height;
let mut emitted = false;
for y_step in start_tile.. {
let offset_y = (y_step - start_tile) as f32 * repeat_y;
let origin_y = origin_y + offset_y;
@ -547,6 +552,7 @@ impl crate::TermWindow {
}
let origin_x = origin_x + offset_x;
let mut quad = layer0.allocate()?;
emitted = true;
// log::info!("quad {origin_x},{origin_y} {width}x{height}");
quad.set_position(origin_x, origin_y, origin_x + width, origin_y + height);
@ -569,6 +575,6 @@ impl crate::TermWindow {
}
}
Ok(())
Ok(emitted)
}
}