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I'm creating a level editor for a Nintendo game that uses tile-based rendering. My current idea is:
Only doing one layer, which has 94,640 tiles alone, makes it run at 10 FPS. It'll likely be even slower when I added the two additional layers and be well over 100k tiles. How can I handle this more efficiently? It's not a memory problem, as the textures are cached and the process is only 100 MB, but a CPU problem. It's doing this inside the |
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Replies: 1 comment 4 replies
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If you're not viewing all 96k tiles at once, you should look into virtual scrolling built into ScrollArea or something like infinite scroll. You only need to draw what is visible in the viewport. |
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I can't find anything about virtual scrolling, but the idea of only drawing what's visible in the viewport is tempting. How do I find what area is visible in the viewport from within the show function of the ScrollArea however? |
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show_rows or show_viewport instead of show |
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fn example(ui: &mut egui::Ui) {
let total_rows = 10;
let total_cols = 50000;
let cell_size = egui::vec2(80., 30.);
egui::ScrollArea::horizontal().show_viewport(ui, |ui, viewport| {
let visible_col_start = (viewport.min.x / cell_size.x).floor() as usize;
let visible_col_end = (viewport.max.x / cell_size.x).ceil() as usize;
// Reserve space for scrolling
ui.allocate_space(egui::vec2(
total_cols as f32 * cell_size.x,
total_rows as f32 * cell_size.y,
));
let painter = ui.painter();
let top_left = ui.min_rect().min;
for row in 0..total_rows {
for col in visible_col_start..visible_col_end {
let pos = top_left + egui::vec2(col as f32 * cell_size.x, row as f32 * cell_size.y);
let rect = egui::Rect::from_min_size(pos, cell_size);
painter.rect_filled(rect, 0., egui::Color32::from_gray(50));
painter.text(
rect.center(),
egui::Align2::CENTER_CENTER,
format!("{col}"),
egui::FontId::monospace(12.0),
egui::Color32::WHITE,
);
}
}
});
} |
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Yep I ended up doing something similar: canceling the tile draw if it was outside the rect's bounds. This worked fantastically. Thank you! |
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show_rows or show_viewport instead of show