Add Forth Salon pixel shader demo

Makefile

@@ -141,6 +141,7 @@ ifeq ($(CONFIG_DEMO_EXAMPLE),y)
 
     libiui_example_files-y := tests/example.c
     libiui_example_files-$(CONFIG_DEMO_PIXELWALL) += tests/pixelwall-demo.c
+    libiui_example_files-$(CONFIG_DEMO_FORTHSALON) += tests/forthsalon-demo.c
     libiui_example_includes-y := include ports externals tests
     libiui_example_depends-y := libiui.a $(NYANCAT_DATA)
     libiui_example_ldflags-y := libiui.a $(TARGET_LIBS)

configs/Kconfig

@@ -359,6 +359,15 @@ config DEMO_PIXELWALL
       Includes Snake, Pong, Tetris, Invaders, and Pacman March.
       Uses a segmented button to switch between designs.
 
+config DEMO_FORTHSALON
+    bool "Forth Salon Pixel Shader"
+    default y
+    depends on DEMO_EXAMPLE && MODULE_NAVIGATION
+    help
+      Forth Salon pixel shader demo.  A bytecode Forth interpreter
+      runs a program per-pixel to generate animated visuals.
+      Built-in examples from boomlinde/sf (twister, rainbow, etc.).
+
 endmenu
 
 # Build Options

src/container.c

@@ -599,8 +599,9 @@ bool iui_bottom_sheet_begin(iui_context *ctx,
 
     /* Track component for MD3 validation (use logical height, not padded rect)
      */
-    iui_rect_t validation_rect = {0, sheet_y, screen_width, current_height};
-    IUI_MD3_TRACK_BOTTOM_SHEET(validation_rect, IUI_BOTTOM_SHEET_CORNER_RADIUS);
+    IUI_MD3_TRACK_BOTTOM_SHEET(
+        ((iui_rect_t) {0, sheet_y, screen_width, current_height}),
+        IUI_BOTTOM_SHEET_CORNER_RADIUS);
 
     /* Draw drag handle */
     float handle_x = (screen_width - IUI_BOTTOM_SHEET_DRAG_HANDLE_WIDTH) * 0.5f;

tests/example.c

@@ -46,6 +46,10 @@
 #include "pixelwall-demo.h"
 #endif
 
+#ifdef CONFIG_DEMO_FORTHSALON
+#include "forthsalon-demo.h"
+#endif
+
 #ifndef M_PI
 #define M_PI 3.14159265358979323846
 #endif
@@ -2930,6 +2934,10 @@ typedef struct {
     pixelwall_state_t pixelwall;
     bool show_pixelwall;
 #endif
+#ifdef CONFIG_DEMO_FORTHSALON
+    forthsalon_state_t forthsalon;
+    bool show_forthsalon;
+#endif
 #ifdef CONFIG_FEATURE_THEME
     bool dark_mode;
 #endif
@@ -3033,6 +3041,10 @@ static void demo_close_other_windows(demo_state_t *state, bool *keep_open)
     if (&state->show_pixelwall != keep_open)
         state->show_pixelwall = false;
 #endif
+#ifdef CONFIG_DEMO_FORTHSALON
+    if (&state->show_forthsalon != keep_open)
+        state->show_forthsalon = false;
+#endif
 }
 #endif /* CONFIG_MODULE_BASIC */
 
@@ -3216,6 +3228,12 @@ static void example_frame(void *arg)
         demo_close_other_windows(state, &state->show_pixelwall);
     iui_grid_next(ui);
 #endif
+#ifdef CONFIG_DEMO_FORTHSALON
+    if (iui_switch(ui, "Forth Salon", &state->show_forthsalon, NULL, NULL) &&
+        state->show_forthsalon)
+        demo_close_other_windows(state, &state->show_forthsalon);
+    iui_grid_next(ui);
+#endif
 #ifdef CONFIG_FEATURE_THEME
     if (iui_switch(ui, "Dark mode", &state->dark_mode, NULL, NULL)) {
         iui_set_theme(ui,
@@ -3318,6 +3336,11 @@ static void example_frame(void *arg)
         draw_pixelwall_window(ui, port, &state->pixelwall, delta_time,
                               get_demo_window_height());
 #endif
+#ifdef CONFIG_DEMO_FORTHSALON
+    if (state->show_forthsalon)
+        draw_forthsalon_window(ui, port, &state->forthsalon, delta_time,
+                               get_demo_window_height());
+#endif
 #ifdef CONFIG_MODULE_INPUT
     if (state->show_textfield_demo)
         draw_textfield_window(ui);
@@ -3638,6 +3661,9 @@ int main(int argc, char *argv[])
 #ifdef CONFIG_DEMO_PIXELWALL
     state.show_pixelwall = DEMO_DEFAULT_VIS;
 #endif
+#ifdef CONFIG_DEMO_FORTHSALON
+    state.show_forthsalon = DEMO_DEFAULT_VIS;
+#endif
 #ifdef CONFIG_FEATURE_THEME
     state.dark_mode = true;
 #endif
@@ -3647,6 +3673,9 @@ int main(int argc, char *argv[])
 #ifdef CONFIG_DEMO_PIXELWALL
     pixelwall_init(&state.pixelwall);
 #endif
+#ifdef CONFIG_DEMO_FORTHSALON
+    forthsalon_init(&state.forthsalon);
+#endif
 
 #ifdef CONFIG_FEATURE_THEME
     /* Set initial theme */