feat:Validate and fix modular graph canvas for Emscripten web demo

.github/workflows/ci.yml

@@ -389,13 +389,22 @@ jobs:
         run: npx playwright test
 
       - name: Upload Playwright HTML report
-        if: failure()
+        if: always()
         uses: actions/upload-artifact@v7
         with:
           name: playwright-report
           path: tests/web/playwright-report/
           retention-days: 7
 
+      - name: Upload Playwright test results
+        if: always()
+        uses: actions/upload-artifact@v7
+        with:
+          name: playwright-test-results
+          path: tests/web/test-results/
+          retention-days: 7
+
+
   test-windows:
     name: Test on Windows
     runs-on: windows-latest

.gitignore

@@ -35,7 +35,13 @@ desktop.ini
 external/
 node_modules/
 package-lock.json
+# Playwright test results & reports
 test-results/
+playwright-report/
+blob-report/
+tests/web/test-results/
+tests/web/playwright-report/
+tests/web/blob-report/
 
 # Compiled
 *.o

src/gui/gui_graph_state.h

@@ -20,10 +20,15 @@ class GuiGraphState {
 
     // Canvas panning and zoom/grid configurations
     ImVec2 scrolling = ImVec2(0.0f, 0.0f);
+    ImVec2 target_scrolling = ImVec2(0.0f, 0.0f);
     bool show_grid = true;
     bool is_fullscreen = false;
     bool hand_tool_active = false;
     float zoom = 1.0f;
+    float target_zoom = 1.0f;
+    float dpi_scale = 1.0f;
+    ImVec2 last_canvas_pos = ImVec2(0.0f, 0.0f);
+    bool canvas_hovered = false;
 
     // Node positioning registry mapped by Node ID
     std::unordered_map<int, NodeLayoutState> node_positions;

src/gui/gui_manager.cpp

@@ -3,6 +3,7 @@
 #include "gui/theme.h"
 #include "gui/file_dialog.h"
 #include "gui/command.h"
+#include "gui/gui_graph_state.h"
 #include "preset_manager.h"
 
 #include "gui/gl_setup.h"
@@ -123,6 +124,8 @@ bool GuiManager::initialize(int width, int height) {
     }
 #endif
 
+    GuiGraphState::get_instance().dpi_scale = dpi_scale;
+
     {
         const float base_font_size = 14.0f;
         const float scaled_size    = base_font_size * dpi_scale;

src/gui/gui_manager.h

@@ -46,6 +46,7 @@ class GuiManager {
     bool run_frame();
 
     MidiManager& midi_manager() { return midi_manager_; }
+    AudioEngine& audio_engine() { return engine_; }
 
 private:
     void render_menu_bar();

src/main.cpp

@@ -1,6 +1,7 @@
 #include "common.h"
 #include "audio/audio_engine.h"
 #include "gui/gui_manager.h"
+#include "gui/gui_graph_state.h"
 #include "preset_manager.h"
 #include "cli.h"
 
@@ -88,6 +89,110 @@ extern "C" EMSCRIPTEN_KEEPALIVE void on_midi_device_connected(const char* device
 
     emscripten_log(EM_LOG_INFO, "[MIDI] Device connected: %s", device_name);
 }
+
+extern "C" EMSCRIPTEN_KEEPALIVE void on_canvas_touch_gesture(float dx, float dy, float dscale, float local_x, float local_y) {
+    auto& ui = Amplitron::GuiGraphState::get_instance();
+    if (dscale != 0.0f) {
+        float factor = 1.0f + dscale;
+        float old_zoom = ui.target_zoom;
+        float new_zoom = old_zoom * factor;
+        if (new_zoom < 0.2f) new_zoom = 0.2f;
+        if (new_zoom > 5.0f) new_zoom = 5.0f;
+        float actual_factor = new_zoom / old_zoom;
+        ui.target_scrolling.x = local_x - (local_x - ui.target_scrolling.x) * actual_factor;
+        ui.target_scrolling.y = local_y - (local_y - ui.target_scrolling.y) * actual_factor;
+        ui.target_zoom = new_zoom;
+    }
+    ui.target_scrolling.x += dx;
+    ui.target_scrolling.y += dy;
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE bool is_canvas_hovered() {
+    return Amplitron::GuiGraphState::get_instance().canvas_hovered;
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE float get_canvas_zoom() {
+    return Amplitron::GuiGraphState::get_instance().target_zoom;
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE float get_canvas_scroll_x() {
+    return Amplitron::GuiGraphState::get_instance().target_scrolling.x;
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE float get_canvas_scroll_y() {
+    return Amplitron::GuiGraphState::get_instance().target_scrolling.y;
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE int get_node_count() {
+    if (!g_gui) return 0;
+    return static_cast<int>(g_gui->audio_engine().graph().get_nodes().size());
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE int get_link_count() {
+    if (!g_gui) return 0;
+    return static_cast<int>(g_gui->audio_engine().graph().get_links().size());
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE bool has_node_of_type(int routing_type) {
+    if (!g_gui) return false;
+    for (const auto& n : g_gui->audio_engine().graph().get_nodes()) {
+        if (static_cast<int>(n.routing_type) == routing_type) return true;
+    }
+    return false;
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE int trigger_add_splitter_node() {
+    if (!g_gui) return -1;
+    auto& graph = g_gui->audio_engine().graph();
+    int id = graph.add_node("Splitter", Amplitron::NodeRoutingType::Splitter);
+    g_gui->audio_engine().commit_graph_changes();
+    return id;
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE int trigger_add_link(int src_pin, int dst_pin) {
+    if (!g_gui) return -1;
+    auto& graph = g_gui->audio_engine().graph();
+    int id = graph.add_link(src_pin, dst_pin);
+    g_gui->audio_engine().commit_graph_changes();
+    return id;
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE int get_node_output_pin_by_index(int node_index, int pin_index) {
+    if (!g_gui) return -1;
+    const auto& nodes = g_gui->audio_engine().graph().get_nodes();
+    if (node_index < 0 || node_index >= static_cast<int>(nodes.size())) return -1;
+    const auto& node = nodes[node_index];
+    if (pin_index < 0 || pin_index >= static_cast<int>(node.output_pin_ids.size())) return -1;
+    return node.output_pin_ids[pin_index];
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE int get_node_input_pin_by_index(int node_index, int pin_index) {
+    if (!g_gui) return -1;
+    const auto& nodes = g_gui->audio_engine().graph().get_nodes();
+    if (node_index < 0 || node_index >= static_cast<int>(nodes.size())) return -1;
+    const auto& node = nodes[node_index];
+    if (pin_index < 0 || pin_index >= static_cast<int>(node.input_pin_ids.size())) return -1;
+    return node.input_pin_ids[pin_index];
+}
+
+extern "C" EMSCRIPTEN_KEEPALIVE bool trigger_delete_last_node() {
+    if (!g_gui) return false;
+    auto& graph = g_gui->audio_engine().graph();
+    const auto& nodes = graph.get_nodes();
+    // Walk backwards to find the last deletable node (mirrors GUI rules: Input and Amp Sim are protected)
+    for (int i = static_cast<int>(nodes.size()) - 1; i >= 0; --i) {
+        const auto& node = nodes[i];
+        if (node.name == "Input" || node.name == "Amp Sim") continue;
+        bool ok = graph.remove_node(node.id);
+        if (ok) {
+            Amplitron::GuiGraphState::get_instance().node_positions.erase(node.id);
+            g_gui->audio_engine().commit_graph_changes();
+        }
+        return ok;
+    }
+    return false; // No deletable node found
+}
+
 #endif
 
 void signal_handler(int /*signal*/) {

tests/web/amplitron.spec.ts

@@ -14,6 +14,17 @@
 
 import { test, expect, Page, ConsoleMessage } from '@playwright/test';
 
+// Emscripten injects `Module` into the page's global scope at runtime.
+// Declare it here so TypeScript doesn't report ts(2304) errors.
+// Overloads narrow the return type based on the `returnType` string literal.
+declare const Module: {
+  ccall(ident: string, returnType: 'number', argTypes: string[], args: (number | string | boolean)[]): number;
+  ccall(ident: string, returnType: 'boolean', argTypes: string[], args: (number | string | boolean)[]): boolean;
+  ccall(ident: string, returnType: 'string', argTypes: string[], args: (number | string | boolean)[]): string;
+  ccall(ident: string, returnType: null, argTypes: string[], args: (number | string | boolean)[]): void;
+};
+
+
 // ---------------------------------------------------------------------------
 // Helpers
 // ---------------------------------------------------------------------------
@@ -465,4 +476,139 @@ test.describe('Web MIDI Support', () => {
       timeout: 5000 
     });
   });
+});
+test.describe('Modular Graph Canvas Interactions', () => {
+  async function waitForRuntime(page: Page) {
+    page.on('console', msg => console.log('BROWSER LOG:', msg.text()));
+    page.on('pageerror', err => console.error('BROWSER ERROR:', err.message));
+    await page.goto('/');
+    await page.waitForSelector('#loading.hidden', { timeout: 60_000 });
+    const overlay = page.locator('#audio-unlock');
+    if (await overlay.isVisible()) await overlay.click();
+    await page.waitForTimeout(500);
+  }
+
+  test('canvas pan via right-click drag shifts scrolling', async ({ page }) => {
+    await waitForRuntime(page);
+
+    const before = await page.evaluate(() => ({
+      x: Module.ccall('get_canvas_scroll_x', 'number', [], []),
+      y: Module.ccall('get_canvas_scroll_y', 'number', [], []),
+    }));
+
+    const canvas = page.locator('#canvas');
+    const box = await canvas.boundingBox();
+    if (!box) throw new Error('canvas not visible');
+
+    const cx = box.x + box.width / 2;
+    const cy = box.y + box.height / 2;
+    await page.mouse.click(cx, cy, { button: 'right' });
+    await page.mouse.move(cx, cy);
+    await page.mouse.down({ button: 'right' });
+    await page.mouse.move(cx + 80, cy + 60, { steps: 10 });
+    await page.mouse.up({ button: 'right' });
+
+    await page.waitForTimeout(200);
+
+    const after = await page.evaluate(() => ({
+      x: Module.ccall('get_canvas_scroll_x', 'number', [], []),
+      y: Module.ccall('get_canvas_scroll_y', 'number', [], []),
+    }));
+
+    expect(after.x).not.toBeCloseTo(before.x, 0);
+    expect(after.y).not.toBeCloseTo(before.y, 0);
+  });
+
+  test('two-finger touch gesture pans and zooms the canvas', async ({ page }) => {
+    await waitForRuntime(page);
+
+    const before = await page.evaluate(() => ({
+      zoom: Module.ccall('get_canvas_zoom', 'number', [], []),
+      sx: Module.ccall('get_canvas_scroll_x', 'number', [], []),
+    }));
+
+    await page.evaluate(() => {
+      Module.ccall('on_canvas_touch_gesture', null, ['number','number','number','number','number'], [30, 20, 0.15, 640, 360]);
+    });
+
+    const after = await page.evaluate(() => ({
+      zoom: Module.ccall('get_canvas_zoom', 'number', [], []),
+      sx: Module.ccall('get_canvas_scroll_x', 'number', [], []),
+    }));
+
+    expect(after.zoom).toBeGreaterThan(before.zoom);
+    expect(after.sx).not.toBeCloseTo(before.sx, 0);
+  });
+
+  test('adding a Splitter node increases the node count', async ({ page }) => {
+    await waitForRuntime(page);
+
+    const countBefore: number = await page.evaluate(() =>
+      Module.ccall('get_node_count', 'number', [], [])
+    );
+
+    await page.evaluate(() =>
+      Module.ccall('trigger_add_splitter_node', 'number', [], [])
+    );
+    await page.waitForTimeout(200);
+
+    const countAfter: number = await page.evaluate(() =>
+      Module.ccall('get_node_count', 'number', [], [])
+    );
+
+    expect(countAfter).toBe(countBefore + 1);
+
+    const hasSplitter: boolean = await page.evaluate(() =>
+      Module.ccall('has_node_of_type', 'boolean', ['number'], [1])
+    );
+    expect(hasSplitter).toBe(true);
+  });
+
+  test('drawing a cable between two nodes increases link count', async ({ page }) => {
+    await waitForRuntime(page);
+
+    const linksBefore: number = await page.evaluate(() =>
+      Module.ccall('get_link_count', 'number', [], [])
+    );
+
+    await page.evaluate(() => {
+      Module.ccall('trigger_add_splitter_node', 'number', [], []);
+    });
+    await page.waitForTimeout(100);
+
+    const result: number = await page.evaluate(() => {
+      const srcPin = Module.ccall('get_node_output_pin_by_index', 'number', ['number', 'number'], [2, 0]);
+      const dstPin = Module.ccall('get_node_input_pin_by_index', 'number', ['number', 'number'], [3, 0]);
+      return Module.ccall('trigger_add_link', 'number', ['number', 'number'], [srcPin, dstPin]);
+    });
+
+    const linksAfter: number = await page.evaluate(() =>
+      Module.ccall('get_link_count', 'number', [], [])
+    );
+
+    expect(linksAfter).toBeGreaterThan(linksBefore);
+  });
+
+  test('deleting a node decreases the node count', async ({ page }) => {
+    await waitForRuntime(page);
+
+    await page.evaluate(() =>
+      Module.ccall('trigger_add_splitter_node', 'number', [], [])
+    );
+    await page.waitForTimeout(100);
+
+    const countBefore: number = await page.evaluate(() =>
+      Module.ccall('get_node_count', 'number', [], [])
+    );
+
+    const deleted: boolean = await page.evaluate(() =>
+      Module.ccall('trigger_delete_last_node', 'boolean', [], [])
+    );
+    expect(deleted).toBe(true);
+
+    const countAfter: number = await page.evaluate(() =>
+      Module.ccall('get_node_count', 'number', [], [])
+    );
+    expect(countAfter).toBe(countBefore - 1);
+  });
 });

tests/web/playwright.config.ts

@@ -43,9 +43,7 @@ export default defineConfig({
         '--use-fake-audio-capture',
         '--use-fake-device-for-media-stream',
         '--use-fake-ui-for-media-stream',
-        // SwiftShader software rasteriser for WebGL in CI (no GPU)
-        '--use-gl=swiftshader',
-        '--disable-gpu',
+        ...(process.env.CI ? ['--use-gl=swiftshader', '--disable-gpu'] : ['--use-gl=angle']),
         '--no-sandbox',
       ],
     },