implement brush cost gauges

they're a little ugly at the moment, and can be a little useless for most simple brushes, but whatever we'll make them better later
2024-10-25 21:38:18 +02:00 · 2024-10-25 21:38:18 +02:00 · 913d65b0a8
parent 43e6951f7d
commit 913d65b0a8
19 changed files with 378 additions and 65 deletions
--- a/crates/haku-wasm/src/lib.rs
+++ b/crates/haku-wasm/src/lib.rs
@ -279,11 +279,24 @@ extern "C" fn haku_status_string(code: StatusCode) -> *const i8 {
    .as_ptr()
 }

+#[derive(Debug)]
+struct CompileStats {
+    ast_size: usize,
+}
+
+#[derive(Debug)]
+struct RunnableBrush {
+    chunk_id: ChunkId,
+    closure_spec: ClosureSpec,
+
+    compile_stats: CompileStats,
+}
+
 #[derive(Debug, Default)]
 enum BrushState {
    #[default]
    Default,
-    Ready(ChunkId, ClosureSpec),
+    Ready(RunnableBrush),
 }

 #[derive(Debug, Default)]
@ -431,7 +444,13 @@ unsafe extern "C" fn haku_compile_brush(
        Ok(chunk_id) => chunk_id,
        Err(_) => return StatusCode::TooManyChunks,
    };
-    brush.state = BrushState::Ready(chunk_id, closure_spec);
+    brush.state = BrushState::Ready(RunnableBrush {
+        chunk_id,
+        closure_spec,
+        compile_stats: CompileStats {
+            ast_size: ast.len(),
+        },
+    });

    info!("brush compiled into {chunk_id:?}");

@ -470,7 +489,7 @@ unsafe extern "C" fn haku_begin_brush(instance: *mut Instance, brush: *const Bru
    let instance = &mut *instance;
    let brush = &*brush;

-    let BrushState::Ready(chunk_id, closure_spec) = brush.state else {
+    let BrushState::Ready(runnable) = &brush.state else {
        panic!("brush is not compiled and ready to be used");
    };

@ -479,10 +498,10 @@ unsafe extern "C" fn haku_begin_brush(instance: *mut Instance, brush: *const Bru
    instance.reset_exception();
    instance.trampoline = None;

-    let Ok(closure_id) = instance
-        .vm
-        .create_ref(Ref::Closure(Closure::chunk(chunk_id, closure_spec)))
-    else {
+    let Ok(closure_id) = instance.vm.create_ref(Ref::Closure(Closure::chunk(
+        runnable.chunk_id,
+        runnable.closure_spec,
+    ))) else {
        return StatusCode::OutOfRefSlots;
    };

@ -574,3 +593,26 @@ unsafe extern "C" fn haku_cont_dotter(
        )
    })
 }
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_stat_ast_size(brush: *const Brush) -> usize {
+    match &(*brush).state {
+        BrushState::Default => 0,
+        BrushState::Ready(runnable) => runnable.compile_stats.ast_size,
+    }
+}
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_stat_num_refs(instance: *const Instance) -> usize {
+    (*instance).vm.num_refs()
+}
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_stat_remaining_fuel(instance: *const Instance) -> usize {
+    (*instance).vm.remaining_fuel()
+}
+
+#[unsafe(no_mangle)]
+unsafe extern "C" fn haku_stat_remaining_memory(instance: *const Instance) -> usize {
+    (*instance).vm.remaining_memory()
+}
--- a/crates/haku/src/vm.rs
+++ b/crates/haku/src/vm.rs
@ -73,10 +73,18 @@ impl Vm {
        }
    }

+    pub fn num_refs(&self) -> usize {
+        self.refs.len()
+    }
+
    pub fn remaining_fuel(&self) -> usize {
        self.fuel
    }

+    pub fn remaining_memory(&self) -> usize {
+        self.memory
+    }
+
    pub fn set_fuel(&mut self, fuel: usize) {
        self.fuel = fuel;
    }
--- a/scripts/mkicon.fish
+++ b/scripts/mkicon.fish
@ -1,7 +1,13 @@
 #!/usr/bin/env fish

-set filename $argv[1]
-set icon_name (basename $filename .svg)
-set icon_base64 (svgcleaner --stdout $filename 2>/dev/null | base64 -w0)
+function mkicon
+    set -l filename $argv[1]
+    set -l icon_name (basename $filename .svg)
+    set -l icon_base64 (svgcleaner --stdout $filename 2>/dev/null | base64 -w0)

-printf "--icon-%s: url('data:image/svg+xml;base64,%s');" "$icon_name" "$icon_base64"
+    printf "--icon-%s: url('data:image/svg+xml;base64,%s');\n" "$icon_name" "$icon_base64"
+end
+
+for arg in $argv
+    mkicon $arg
+end
--- a/static/base.css
+++ b/static/base.css
@ -166,12 +166,20 @@ pre:has(code) {
 /* Icons */

 :root {
-    --icon-rkgk-grayscale: url("data:image/svg+xml;base64,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");
+    --icon-brackets: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJtNyA0aC0zdjhoM20yLThoM3Y4aC0zIiBzdHJva2U9IiMwMDAiIHN0cm9rZS13aWR0aD0iMiIvPjwvc3ZnPg==");
+    --icon-droplet: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJtNSAxMGMwLTEuNjM0NzIgMS4wMDIxMi00LjI3MTU2IDIuMTg3MjYtNi41NDUzNy4zNDg5My0uNjY5NDQgMS4yNzY1NS0uNjY5NDQgMS42MjU0OCAwIDEuMTg1MTQgMi4yNzM4MSAyLjE4NzI2IDQuOTEwNjUgMi4xODcyNiA2LjU0NTM3IDAgMi0xLjUgMy0zIDNzLTMtMS0zLTN6IiBmaWxsPSIjMDAwIi8+PC9zdmc+");
    --icon-external-link: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48ZyBzdHJva2U9IiMwMDAiPjxwYXRoIGQ9Im0xMC41IDl2Mi41aC02di02aDIuNSIvPjxwYXRoIGQ9Im03IDkgNC41LTQuNW0wIDBoLTMuNW0zLjUgMHYzLjUiLz48L2c+PC9zdmc+");
+    --icon-memory: url("data:image/svg+xml;base64,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");
+    --icon-object: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBjbGlwLXJ1bGU9ImV2ZW5vZGQiIGQ9Im0xMiA2YzAgMS4xMDQ1Ny0uODk1NCAyLTIgMnYyYzIuMjA5MSAwIDQtMS43OTA4NiA0LTRzLTEuNzkwOS00LTQtNGMtMi4yMDkxNCAwLTQgMS43OTA4Ni00IDRoMmMwLTEuMTA0NTcuODk1NDMtMiAyLTIgMS4xMDQ2IDAgMiAuODk1NDMgMiAyeiIgZmlsbD0iIzAwMCIgZmlsbC1ydWxlPSJldmVub2RkIi8+PHBhdGggZD0ibTMgN2g2djZoLTZ6IiBzdHJva2U9IiMwMDAiIHN0cm9rZS13aWR0aD0iMiIvPjwvc3ZnPg==");
+    --icon-rkgk-grayscale: url("data:image/svg+xml;base64,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");
+
+    --icon-brackets-white: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJtNyA0aC0zdjhoM20yLThoM3Y4aC0zIiBzdHJva2U9IiNmZmYiIHN0cm9rZS13aWR0aD0iMiIvPjwvc3ZnPg==");
+    --icon-droplet-white: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBkPSJtNSAxMGMwLTEuNjM0NzIgMS4wMDIxMi00LjI3MTU2IDIuMTg3MjYtNi41NDUzNy4zNDg5My0uNjY5NDQgMS4yNzY1NS0uNjY5NDQgMS42MjU0OCAwIDEuMTg1MTQgMi4yNzM4MSAyLjE4NzI2IDQuOTEwNjUgMi4xODcyNiA2LjU0NTM3IDAgMi0xLjUgMy0zIDNzLTMtMS0zLTN6IiBmaWxsPSIjZmZmIi8+PC9zdmc+");
+    --icon-object-white: url("data:image/svg+xml;base64,PHN2ZyBmaWxsPSJub25lIiBoZWlnaHQ9IjE2IiB2aWV3Qm94PSIwIDAgMTYgMTYiIHdpZHRoPSIxNiIgeG1sbnM9Imh0dHA6Ly93d3cudzMub3JnLzIwMDAvc3ZnIj48cGF0aCBjbGlwLXJ1bGU9ImV2ZW5vZGQiIGQ9Im0xMiA2YzAgMS4xMDQ1Ny0uODk1NCAyLTIgMnYyYzIuMjA5MSAwIDQtMS43OTA4NiA0LTRzLTEuNzkwOS00LTQtNGMtMi4yMDkxNCAwLTQgMS43OTA4Ni00IDRoMmMwLTEuMTA0NTcuODk1NDMtMiAyLTIgMS4xMDQ2IDAgMiAuODk1NDMgMiAyeiIgZmlsbD0iI2ZmZiIgZmlsbC1ydWxlPSJldmVub2RkIi8+PHBhdGggZD0ibTMgN2g2djZoLTZ6IiBzdHJva2U9IiNmZmYiIHN0cm9rZS13aWR0aD0iMiIvPjwvc3ZnPg==");
+    --icon-memory-white: url("data:image/svg+xml;base64,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");
 }

 .icon {
-    display: inline-block;
    vertical-align: middle;
    width: 16px;
    height: 16px;
@ -179,10 +187,35 @@ pre:has(code) {
    background-repeat: no-repeat;
    background-position: 50% 50%;

-    &.icon-rkgk-grayscale {
-        background-image: var(--icon-rkgk-grayscale);
+    &.icon-brackets {
+        background-image: var(--icon-brackets);
+    }
+    &.icon-droplet {
+        background-image: var(--icon-droplet);
    }
    &.icon-external-link {
        background-image: var(--icon-external-link);
    }
+    &.icon-memory {
+        background-image: var(--icon-memory);
+    }
+    &.icon-object {
+        background-image: var(--icon-object);
+    }
+    &.icon-rkgk-grayscale {
+        background-image: var(--icon-rkgk-grayscale);
+    }
+
+    &.icon-brackets-white {
+        background-image: var(--icon-brackets-white);
+    }
+    &.icon-droplet-white {
+        background-image: var(--icon-droplet-white);
+    }
+    &.icon-memory-white {
+        background-image: var(--icon-memory-white);
+    }
+    &.icon-object-white {
+        background-image: var(--icon-object-white);
+    }
 }
--- a/static/brush-cost.js
+++ b/static/brush-cost.js
@ -0,0 +1,81 @@
+class Gauge extends HTMLElement {
+    constructor(iconName, label) {
+        super();
+
+        this.iconName = iconName;
+        this.label = label;
+    }
+
+    connectedCallback() {
+        this.role = "progressbar";
+        this.classList.add("icon", `icon-${this.iconName}`);
+
+        this.full = this.appendChild(document.createElement("div"));
+        this.full.classList.add("full", "icon", `icon-${this.iconName}-white`);
+    }
+
+    setValue(value, valueMax) {
+        let clampedNormalized = Math.max(0, Math.min(1, value / valueMax));
+        this.style.setProperty("--progress", `${clampedNormalized * 100}%`);
+        this.title = `${this.label}: ${value} / ${valueMax} (${Math.ceil((value / valueMax) * 100)}%)`;
+    }
+}
+
+customElements.define("rkgk-brush-cost-gauge", Gauge);
+
+export class BrushCostGauges extends HTMLElement {
+    constructor() {
+        super();
+    }
+
+    connectedCallback() {
+        this.codeSizeGauge = this.appendChild(
+            createGauge({
+                className: "code-size",
+                iconName: "brackets",
+                label: "Code size",
+            }),
+        );
+        this.fuelGauge = this.appendChild(
+            createGauge({
+                className: "fuel",
+                iconName: "droplet",
+                label: "Fuel",
+            }),
+        );
+        this.objectsGauge = this.appendChild(
+            createGauge({
+                className: "objects",
+                iconName: "object",
+                label: "Objects",
+            }),
+        );
+        this.memoryGauge = this.appendChild(
+            createGauge({
+                className: "memory",
+                iconName: "memory",
+                label: "Bulk memory",
+            }),
+        );
+
+        this.codeSizeGauge.setValue(0);
+        this.fuelGauge.setValue(0);
+        this.objectsGauge.setValue(0);
+        this.memoryGauge.setValue(0);
+    }
+
+    update(stats) {
+        this.codeSizeGauge.setValue(stats.astSize, stats.astSizeMax);
+        this.fuelGauge.setValue(stats.fuel, stats.fuelMax);
+        this.objectsGauge.setValue(stats.numRefs, stats.numRefsMax);
+        this.memoryGauge.setValue(stats.memory, stats.memoryMax);
+    }
+}
+
+customElements.define("rkgk-brush-cost-gauges", BrushCostGauges);
+
+function createGauge({ className, iconName, label }) {
+    let gauge = new Gauge(iconName, label);
+    gauge.classList.add(className);
+    return gauge;
+}
--- a/static/haku.js
+++ b/static/haku.js
@ -257,4 +257,24 @@ export class Haku {

        return { status: "ok" };
    }
+
+    get astSize() {
+        if (this.#pBrush != 0) {
+            return w.haku_stat_ast_size(this.#pBrush);
+        } else {
+            return 0;
+        }
+    }
+
+    get numRefs() {
+        return w.haku_stat_num_refs(this.#pInstance);
+    }
+
+    get remainingFuel() {
+        return w.haku_stat_remaining_fuel(this.#pInstance);
+    }
+
+    get remainingMemory() {
+        return w.haku_stat_remaining_memory(this.#pInstance);
+    }
 }
--- a/static/icon/brackets-white.svg
+++ b/static/icon/brackets-white.svg
@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M7 4H4V12H7M9 4H12V12H9" stroke="white" stroke-width="2"/>
+</svg>
--- a/static/icon/brackets.svg
+++ b/static/icon/brackets.svg
@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M7 4H4V12H7M9 4H12V12H9" stroke="black" stroke-width="2"/>
+</svg>
--- a/static/icon/droplet-white.svg
+++ b/static/icon/droplet-white.svg
@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M5 10C5 8.36528 6.00212 5.72844 7.18726 3.45463C7.53619 2.78519 8.46381 2.78519 8.81274 3.45463C9.99788 5.72844 11 8.36528 11 10C11 12 9.5 13 8 13C6.5 13 5 12 5 10Z" fill="white"/>
+</svg>
--- a/static/icon/droplet.svg
+++ b/static/icon/droplet.svg
@ -0,0 +1,3 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path d="M5 10C5 8.36528 6.00212 5.72844 7.18726 3.45463C7.53619 2.78519 8.46381 2.78519 8.81274 3.45463C9.99788 5.72844 11 8.36528 11 10C11 12 9.5 13 8 13C6.5 13 5 12 5 10Z" fill="black"/>
+</svg>
--- a/static/icon/memory-white.svg
+++ b/static/icon/memory-white.svg
@ -0,0 +1,9 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<rect x="5.05" y="3.05" width="5.9" height="9.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="3.05" y="4.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="11.05" y="4.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="3.05" y="7.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="11.05" y="7.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="3.05" y="10.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+<rect x="11.05" y="10.05" width="1.9" height="1.9" fill="white" stroke="white" stroke-width="0.1"/>
+</svg>
--- a/static/icon/memory.svg
+++ b/static/icon/memory.svg
@ -0,0 +1,9 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<rect x="5.05" y="3.05" width="5.9" height="9.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="3.05" y="4.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="11.05" y="4.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="3.05" y="7.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="11.05" y="7.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="3.05" y="10.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+<rect x="11.05" y="10.05" width="1.9" height="1.9" fill="black" stroke="black" stroke-width="0.1"/>
+</svg>
--- a/static/icon/object-white.svg
+++ b/static/icon/object-white.svg
@ -0,0 +1,4 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M12 6C12 7.10457 11.1046 8 10 8V10C12.2091 10 14 8.20914 14 6C14 3.79086 12.2091 2 10 2C7.79086 2 6 3.79086 6 6H8C8 4.89543 8.89543 4 10 4C11.1046 4 12 4.89543 12 6Z" fill="white"/>
+<rect x="3" y="7" width="6" height="6" stroke="white" stroke-width="2"/>
+</svg>
--- a/static/icon/object.svg
+++ b/static/icon/object.svg
@ -0,0 +1,4 @@
+<svg width="16" height="16" viewBox="0 0 16 16" fill="none" xmlns="http://www.w3.org/2000/svg">
+<path fill-rule="evenodd" clip-rule="evenodd" d="M12 6C12 7.10457 11.1046 8 10 8V10C12.2091 10 14 8.20914 14 6C14 3.79086 12.2091 2 10 2C7.79086 2 6 3.79086 6 6H8C8 4.89543 8.89543 4 10 4C11.1046 4 12 4.89543 12 6Z" fill="black"/>
+<rect x="3" y="7" width="6" height="6" stroke="black" stroke-width="2"/>
+</svg>
--- a/static/icon/rkgk
+++ b/static/icon/rkgk
--- a/static/index.css
+++ b/static/index.css
@ -15,7 +15,7 @@ main {
    height: 100%;
    position: relative;

-    &>.fullscreen {
+    & > .fullscreen {
        width: 100%;
        height: 100%;
        max-width: 100%;
@ -25,23 +25,26 @@ main {
        top: 0;
    }

-    &>.panels {
+    & > .panels {
        --right-width: 384px; /* Overridden by JavaScript */
-        
+
        box-sizing: border-box;
        padding: 16px;

        display: grid;
-        grid-template-columns: [left] 1fr [right-resize] auto [right] minmax(0, var(--right-width));
+        grid-template-columns: [left] 1fr [right-resize] auto [right] minmax(
+                0,
+                var(--right-width)
+            );

        /* Pass all events through. Children may receive events as normal. */
        pointer-events: none;

-        &>* {
+        & > * {
            pointer-events: all;
        }

-        &>.right {
+        & > .right {
            grid-column: right / right;
            min-height: 0;

@ -53,29 +56,41 @@ main {

            pointer-events: none;

-            &>* {
+            & > * {
                min-width: 0;
                min-height: 0;
            }

-            &>rkgk-resize-handle {
+            & > rkgk-resize-handle {
                pointer-events: auto;
            }

-            &>.docked>rkgk-brush-editor {
+            & > .docked > rkgk-brush-editor {
                max-height: 100%;
                pointer-events: auto;
            }

-            &>.floating>rkgk-brush-preview {
-                width: 128px;
-                height: 128px;
-                pointer-events: auto;
+            & > .floating {
+                display: flex;
+                flex-direction: column;
+
+                gap: 12px;
+
+                & > rkgk-brush-preview {
+                    width: 128px;
+                    height: 128px;
+                    pointer-events: auto;
+                }
+
+                & > rkgk-brush-cost-gauges {
+                    width: 100%;
+                    pointer-events: auto;
+                }
            }
        }
    }

-    &>rkgk-canvas-renderer {
+    & > rkgk-canvas-renderer {
        width: 100%;
        height: 100%;
        position: absolute;
@ -83,7 +98,7 @@ main {
        top: 0;
    }

-    &>rkgk-reticle-renderer {
+    & > rkgk-reticle-renderer {
        width: 100%;
        height: 100%;
        position: absolute;
@ -92,7 +107,7 @@ main {
        overflow: hidden;
    }

-    &>#js-loading {
+    & > #js-loading {
        background-color: var(--color-panel-background);

        display: flex;
@ -111,7 +126,7 @@ rkgk-resize-handle {

        cursor: col-resize;

-        &>.visual {
+        & > .visual {
            width: 2px;
            height: 100%;
            background-color: var(--color-brand-blue);
@ -119,7 +134,8 @@ rkgk-resize-handle {
            opacity: 0%;
        }

-        &:hover>.visual, &.dragging>.visual {
+        &:hover > .visual,
+        &.dragging > .visual {
            opacity: 100%;
        }
    }
@ -130,7 +146,7 @@ rkgk-resize-handle {
 rkgk-canvas-renderer {
    display: block;

-    &>canvas {
+    & > canvas {
        display: block;
    }
 }
@ -142,7 +158,7 @@ rkgk-reticle-renderer {

    pointer-events: none;

-    &>.reticles {
+    & > .reticles {
        position: relative;
    }
 }
@ -153,15 +169,15 @@ rkgk-reticle-cursor {
    position: absolute;
    display: block;

-    &>.container {
-        &>.arrow {
+    & > .container {
+        & > .arrow {
            width: 24px;
            height: 24px;
            background-color: var(--color);
            clip-path: path("M 0,0 L 13,13 L 6,13 L 0,19 Z");
        }

-        &>.nickname {
+        & > .nickname {
            position: absolute;
            top: 20px;
            left: 8px;
@ -188,7 +204,7 @@ rkgk-code-editor {

    overflow: auto;

-    &>.layer {
+    & > .layer {
        position: absolute;
        left: 0;
        top: 0;
@ -203,7 +219,7 @@ rkgk-code-editor {
        display: flex;
        flex-direction: column;

-        &>.line {
+        & > .line {
            flex-shrink: 0;
            white-space: pre-wrap;

@ -211,14 +227,14 @@ rkgk-code-editor {
        }
    }

-    &>.layer-gutter {
+    & > .layer-gutter {
        user-select: none;

        counter-reset: line;

        color: transparent;

-        &>.line {
+        & > .line {
            display: flex;
            flex-direction: row;

@ -241,27 +257,27 @@ rkgk-code-editor {
        }
    }

-    &>.layer:not(.layer-gutter) {
+    & > .layer:not(.layer-gutter) {
        margin-left: var(--gutter-width);
        width: calc(100% - var(--gutter-width));
    }

-    &>.layer-error-squiggles {
+    & > .layer-error-squiggles {
        color: transparent;

-        &>.line {
-            &>.squiggle {
+        & > .line {
+            & > .squiggle {
                text-decoration: underline wavy black;
                text-decoration-skip-ink: none;
            }

-            &>.squiggle-error {
+            & > .squiggle-error {
                text-decoration-color: var(--color-error);
            }
        }
    }

-    &>textarea {
+    & > textarea {
        display: block;
        width: calc(100% - var(--gutter-width));
        margin: 0;
@ -294,8 +310,8 @@ rkgk-brush-editor.rkgk-panel {
    gap: 4px;

    position: relative;
-    
-    &>.text-area {
+
+    & > .text-area {
        display: block;
        width: 100%;
        margin: 0;
@ -306,18 +322,19 @@ rkgk-brush-editor.rkgk-panel {
        box-sizing: border-box;
    }

-    &>.errors:empty, &>.error-header:empty {
+    & > .errors:empty,
+    & > .error-header:empty {
        display: none;
    }

-    &>.error-header {
+    & > .error-header {
        margin: 0;
        margin-top: 0.5em;
        font-size: 1rem;
        color: var(--color-error);
    }

-    &>.errors {
+    & > .errors {
        margin: 0;
        color: var(--color-error);
        white-space: pre-wrap;
@ -334,13 +351,19 @@ rkgk-brush-preview {
    display: block;
    position: relative;

-    background:
-        repeating-conic-gradient(var(--checkerboard-light) 0% 25%, var(--checkerboard-dark) 0% 50%)
+    background: repeating-conic-gradient(
+            var(--checkerboard-light) 0% 25%,
+            var(--checkerboard-dark) 0% 50%
+        )
        50% 50% / var(--checkerboard-size) var(--checkerboard-size);
    border-radius: 4px;

+    & > canvas {
+        border-radius: 4px;
+    }
+
    &.error {
-        &>canvas {
+        & > canvas {
            display: none;
        }

@ -354,10 +377,53 @@ rkgk-brush-preview {
    }
 }

+/* Brush cost gauges */
+
+rkgk-brush-cost-gauges,
+rkgk-brush-cost-gauges.rkgk-panel {
+    --gauge-size: 20px;
+
+    height: var(--gauge-size);
+    border-radius: 4px;
+
+    display: flex;
+    flex-direction: row;
+
+    overflow: clip; /* clip corners */
+
+    & > rkgk-brush-cost-gauge {
+        display: block;
+        height: var(--gauge-size);
+        flex-grow: 1;
+
+        & > .full {
+            width: 100%;
+            height: 100%;
+
+            clip-path: xywh(0 0 var(--progress) 100%);
+
+            background-color: var(--gauge-color);
+        }
+
+        &.code-size {
+            --gauge-color: var(--color-brand-blue);
+        }
+        &.fuel {
+            --gauge-color: #f44096;
+        }
+        &.objects {
+            --gauge-color: #fd9916;
+        }
+        &.memory {
+            --gauge-color: #5aca40;
+        }
+    }
+}
+
 /* Welcome screen */

 rkgk-welcome {
-    &>dialog {
+    & > dialog {
        h3 {
            margin: 0.5rem 0;
            font-size: 2rem;
@ -369,7 +435,8 @@ rkgk-welcome {
 /* Connection status dialogs */

 rkgk-connection-status {
-    &>dialog[name='logging-in-dialog'][open], &>dialog[name='disconnected-dialog'][open] {
+    & > dialog[name="logging-in-dialog"][open],
+    & > dialog[name="disconnected-dialog"][open] {
        border: none;
        outline: none;
        background: none;
@ -379,8 +446,8 @@ rkgk-connection-status {
        align-items: center;
    }

-    &>dialog[name='error-dialog'][open] {
-        & textarea[name='error-text'] {
+    & > dialog[name="error-dialog"][open] {
+        & textarea[name="error-text"] {
            box-sizing: border-box;
            width: 100%;
            resize: none;
@ -394,7 +461,7 @@ rkgk-connection-status {

 .menu-bar {
    --border-radius: 4px;
-    
+
    display: flex;
    align-items: center;
    box-sizing: border-box;
@ -403,9 +470,9 @@ rkgk-connection-status {
    height: 24px;
    border-radius: var(--border-radius);

-    &>a {
+    & > a {
        display: block;
-        
+
        color: var(--color-text);
        padding: 4px 8px;
        text-decoration: none;
@ -432,11 +499,10 @@ rkgk-connection-status {
        }
    }

-    &>hr {
+    & > hr {
        height: 100%;
        margin: 0;
        border: none;
        border-right: 1px solid var(--color-panel-border);
    }
 }
-
--- a/static/index.js
+++ b/static/index.js
@ -18,6 +18,7 @@ let canvasRenderer = main.querySelector("rkgk-canvas-renderer");
 let reticleRenderer = main.querySelector("rkgk-reticle-renderer");
 let brushEditor = main.querySelector("rkgk-brush-editor");
 let brushPreview = main.querySelector("rkgk-brush-preview");
+let brushCostGauges = main.querySelector("rkgk-brush-cost-gauges");
 let welcome = main.querySelector("rkgk-welcome");
 let connectionStatus = main.querySelector("rkgk-connection-status");

@ -251,12 +252,15 @@ function readUrl(urlString) {
        let compileResult = currentUser.setBrush(brushEditor.code);
        brushEditor.renderHakuResult("Compilation", compileResult);

+        brushCostGauges.update(currentUser.getStats(session.wallInfo));
+
        if (compileResult.status != "ok") {
            brushPreview.setErrorFlag();
            return;
        }

        brushPreview.renderBrush(currentUser.haku).then((previewResult) => {
+            brushCostGauges.update(currentUser.getStats(session.wallInfo));
            if (previewResult.status == "error") {
                brushEditor.renderHakuResult(
                    previewResult.phase == "eval" ? "Evaluation" : "Rendering",
--- a/static/online-users.js
+++ b/static/online-users.js
@ -89,6 +89,19 @@ export class User {
            return false;
        }
    }
+
+    getStats(wallInfo) {
+        return {
+            astSize: this.haku.astSize,
+            astSizeMax: wallInfo.hakuLimits.ast_capacity,
+            numRefs: this.haku.numRefs,
+            numRefsMax: wallInfo.hakuLimits.ref_capacity,
+            fuel: wallInfo.hakuLimits.fuel - this.haku.remainingFuel,
+            fuelMax: wallInfo.hakuLimits.fuel,
+            memory: wallInfo.hakuLimits.memory - this.haku.remainingMemory,
+            memoryMax: wallInfo.hakuLimits.memory,
+        };
+    }
 }

 export class OnlineUsers extends EventTarget {
--- a/template/index.hbs.html
+++ b/template/index.hbs.html
@ -21,6 +21,7 @@
        <script type="module">
            import "rkgk/live-reload.js";

+            import "rkgk/brush-cost.js";
            import "rkgk/brush-editor.js";
            import "rkgk/brush-preview.js";
            import "rkgk/canvas-renderer.js";
@ -64,6 +65,7 @@
                <div class="right">
                    <div class="floating">
                        <rkgk-brush-preview></rkgk-brush-preview>
+                        <rkgk-brush-cost-gauges class="rkgk-panel"></rkgk-brush-cost-gauges>
                    </div>
                    <rkgk-resize-handle
                        data-direction="vertical"