From 633ae721488bc51a3714fe5503cda3add04ef480 Mon Sep 17 00:00:00 2001
From: Emil Kosz <ekosz@int.pl>
Date: Sun, 15 Jun 2025 19:48:50 +0200
Subject: [PATCH] IDK...

---
 game/res/shaders/uiwidget.frag  |  4 +-
 game/shell.nix                  |  1 +
 game/src/main.c                 |  3 +-
 game/src/ui/uiman.c             | 35 +++++++++++++---
 game/src/ui/uiman.h             |  1 +
 game/src/ui/widget_composites.c |  4 +-
 game/src/ui/widget_composites.h |  2 +-
 game/src/ui/widget_core.c       | 71 +++++++++++++++++++++++++++++----
 game/src/ui/widget_core.h       | 39 +++++++++---------
 game/src/ui/widget_layout.c     | 23 ++++++-----
 game/src/ui/widget_ops.c        |  2 +
 game/src/ui/widget_ops.h        |  5 +--
 game/src/ui/widget_render.c     | 21 ++++++----
 game/src/ui/widget_style.h      | 20 ++++++++++
 14 files changed, 170 insertions(+), 61 deletions(-)
 create mode 100644 game/src/ui/widget_style.h

diff --git a/game/res/shaders/uiwidget.frag b/game/res/shaders/uiwidget.frag
index c1276a8..5a8fa75 100644
--- a/game/res/shaders/uiwidget.frag
+++ b/game/res/shaders/uiwidget.frag
@@ -13,6 +13,8 @@ uniform vec4 border_color;
 
 uniform vec4 background_color;
 
+uniform vec4 icon_color;
+
 uniform vec2 scrollbar_position;
 uniform vec2 scrollbar_size;
 
@@ -54,7 +56,7 @@ void main ()
   
   if (has_icon)
     {
-      vec4 fg = texture2D (icons, f_icon_uv);
+      vec4 fg = texture2D (icons, f_icon_uv) * icon_color;
       base_color = mix (base_color, fg, fg.a);
     }
 
diff --git a/game/shell.nix b/game/shell.nix
index a9dd998..6bb98a7 100644
--- a/game/shell.nix
+++ b/game/shell.nix
@@ -11,6 +11,7 @@ pkgs.mkShellNoCC {
     cglm
     glew
     glib
+    lua
 
     gcc
     pkg-config
diff --git a/game/src/main.c b/game/src/main.c
index 12fc81c..afa67fe 100644
--- a/game/src/main.c
+++ b/game/src/main.c
@@ -16,7 +16,7 @@ SDL_AppInit (void **appstate, int argc, char **argv)
 {
   UNUSED (appstate, argc, argv);
   SDL_SetAppMetadata (GAME_NAME, GAME_VERSION, "eur.chopininteractive.wschod-game");
-  
+
   graphics_init ();
   resources_init ();
   flags_init ();
@@ -63,4 +63,5 @@ SDL_AppQuit (void *appstate, SDL_AppResult result)
 {
   UNUSED (appstate, result);
   graphics_free ();
+  uiman_free ();
 }
diff --git a/game/src/ui/uiman.c b/game/src/ui/uiman.c
index bfd043e..295635f 100644
--- a/game/src/ui/uiman.c
+++ b/game/src/ui/uiman.c
@@ -24,19 +24,18 @@ uiman_init ()
   ui_widget_mesh_init ();
   glm_ortho (0.0, (float) sdl_window_w, (float) sdl_window_h, 0.0, -1.0, 1.0, projection);
 
-  Widget *debug_menu = Widget_container_new (FALSE, 8, 4);
-  debug_menu->background_image = RESTEX ("terrain4");
+  Widget *debug_menu = Widget_container_new (FALSE);
+  debug_menu->style->layout_padding = 8;
+  debug_menu->style->background_image = RESTEX ("terrain4");
   VEC2_SETI (debug_menu->position, 32, 32);
   VEC2_SETI (debug_menu->size, 350, 170);
-  debug_menu->border_width = 4;
-  VEC4_SETI (debug_menu->border_color, 0, 1, 0, 1);
   Widget_add_child (ui_root, debug_menu);
 
   Widget_add_child_weighed (debug_menu, Widget_label_make_float ("Frame time: %.3f", &delta_time, TEXT_ALIGN_LEFT), 1);
   Widget_add_child_weighed (debug_menu, Widget_label_make_int ("Chunks rendered: %d", &n_frame_chunks, TEXT_ALIGN_LEFT), 1);
   Widget_add_child_weighed (debug_menu, Widget_label_make_int ("Entities rendered: %d", &n_frame_ents, TEXT_ALIGN_LEFT), 1);
 
-  Widget *poscont = Widget_container_new (TRUE, 0, 4);
+  Widget *poscont = Widget_container_new (TRUE);
   Widget_add_child_weighed (poscont, Widget_label_make_float ("X: %.1f", &camera_position[0], TEXT_ALIGN_LEFT), 1);
   Widget_add_child_weighed (poscont, Widget_label_make_float ("Y: %.1f", &camera_position[1], TEXT_ALIGN_CENTER), 1);
   Widget_add_child_weighed (poscont, Widget_label_make_float ("Z: %.1f", &camera_position[2], TEXT_ALIGN_RIGHT), 1);
@@ -44,10 +43,28 @@ uiman_init ()
 
   Widget_add_child_weighed (debug_menu, Widget_composite_spinner_make_int ("Render distance: %d", &render_distance), 1);
 
-  Widget *chkboxes = Widget_container_new (TRUE, 0, 4);
+  Widget *chkboxes = Widget_container_new (TRUE);
   Widget_add_child_weighed (chkboxes, Widget_composite_checkbox_make ("Wireframe", "wireframe_enabled"), 1);
   Widget_add_child_weighed (chkboxes, Widget_composite_checkbox_make ("Flight", "flight_enabled"), 1);
   Widget_add_child_weighed (debug_menu, chkboxes, 1);
+
+  Widget *window2 = Widget_container_new (TRUE);
+  window2->style->layout_padding = 8;
+  window2->style->background_image = RESTEX ("terrain3");
+  VEC2_SETI (window2->position, 400, 32);
+  VEC2_SETI (window2->size, 350, 170);
+
+  Widget *scrollable = Widget_scrollable_new ();
+
+  Widget *image = Widget_plain_new ();
+  image->style->background_image = RESTEX ("terrain2");
+  VEC2_SETI (image->size, 400, 400);
+  Widget_add_child (scrollable, image);
+
+  Widget_add_child_weighed (window2, scrollable, 0.95);
+  Widget_add_child_weighed (window2, Widget_scrollbar_new (scrollable, FALSE), 0.05);
+
+  Widget_add_child (ui_root, window2);
 }
 
 void
@@ -62,6 +79,12 @@ uiman_render ()
   Widget_render (ui_root, projection, sdl_window_h);
 }
 
+void
+uiman_free ()
+{
+  Widget_free (ui_root);
+}
+
 static inline gboolean
 _uiman_call_on_event (Widget *widget, WidgetEvent event)
 {
diff --git a/game/src/ui/uiman.h b/game/src/ui/uiman.h
index 53ea036..996b006 100644
--- a/game/src/ui/uiman.h
+++ b/game/src/ui/uiman.h
@@ -10,6 +10,7 @@
 void uiman_init ();
 void uiman_tick ();
 void uiman_render ();
+void uiman_free ();
 
 gboolean uiman_cb_switch_focus (SDL_Event *event, void *data);
 
diff --git a/game/src/ui/widget_composites.c b/game/src/ui/widget_composites.c
index c40dcfe..6c06736 100644
--- a/game/src/ui/widget_composites.c
+++ b/game/src/ui/widget_composites.c
@@ -19,7 +19,7 @@ Widget_label_make_float (const char *fmt, float *ptr, TextAlignment alignment)
 Widget *
 Widget_composite_spinner_make_int (const char *fmt, int *ptr)
 {
-  Widget *cont = Widget_container_new (TRUE, 0, 8);
+  Widget *cont = Widget_container_new (TRUE);
   Widget *left = Widget_plain_new ();
   Widget *label = Widget_label_make_int (fmt, ptr, TEXT_ALIGN_CENTER);
   Widget *right = Widget_plain_new ();
@@ -43,7 +43,7 @@ Widget_composite_checkbox_make (const char *label, char *flag)
 {
   UNUSED (flag);
   
-  Widget *cont = Widget_container_new (TRUE, 0, 8);
+  Widget *cont = Widget_container_new (TRUE);
   Widget *box = Widget_plain_new ();
 
   box->icon = ICON_CHECKBOX_UNCHECKED;
diff --git a/game/src/ui/widget_composites.h b/game/src/ui/widget_composites.h
index 99c1bb1..eea0d12 100644
--- a/game/src/ui/widget_composites.h
+++ b/game/src/ui/widget_composites.h
@@ -1,6 +1,6 @@
 #pragma once
 
-#include "widget_fw.h"
+/* #include "widget_fw.h" */
 #include "widget_core.h"
 #include "widget_ops.h"
 
diff --git a/game/src/ui/widget_core.c b/game/src/ui/widget_core.c
index a4a6d60..f628454 100644
--- a/game/src/ui/widget_core.c
+++ b/game/src/ui/widget_core.c
@@ -6,9 +6,23 @@ static const Widget DEFAULT_WIDGET =
     .do_layout        = NULL,
     .do_render        = Widget_render_base,
     .visible          = true,
+    .layout_dirty     = true,
     .children         = NULL,
-    .icon             = ICON_NONE,
-    .background_color = { 0.0, 0.0, 0.0, 0.0 }
+    .icon             = ICON_NONE
+  };
+
+WidgetStyle DEFAULT_STYLE =
+  {
+    .background_color = { 0.0, 0.0, 0.0, 0.0 },
+    .text_color       = { 1.0, 1.0, 1.0, 1.0 },
+    .icon_color       = { 1.0, 1.0, 1.0, 1.0 },
+    .border_color     = { 1.0, 1.0, 1.0, 1.0 },
+
+    .border_width         = 0,
+    .layout_padding       = 0,
+    .layout_child_spacing = 8,
+
+    .background_image = 0
   };
 
 static inline Widget *
@@ -20,6 +34,7 @@ ui_el_new_internal (WidgetKind kind)
   *e = DEFAULT_WIDGET;
   e->kind = kind;
   e->children = g_array_new (false, false, sizeof (Widget *));
+  e->style = g_memdup2 (&DEFAULT_STYLE, sizeof (WidgetStyle));
   return e;
 }
 
@@ -30,13 +45,11 @@ Widget_plain_new ()
 }
 
 Widget *
-Widget_container_new (gboolean horizontal, float padding, float child_spacing)
+Widget_container_new (gboolean horizontal)
 {
   Widget *e = ui_el_new_internal (WIDGET_CONTAINER);
   e->do_layout = Widget_layout_container;
   e->container.horizontal = horizontal;
-  e->container.padding = padding;
-  e->container.child_spacing = child_spacing;
   return e;
 }
 
@@ -47,7 +60,6 @@ Widget_label_new (const char *text, TextAlignment alignment)
   e->do_render = Widget_render_label;
   e->label.text = g_string_new (text);
   e->label.text_alignment = alignment;
-  glm_vec4_one (e->label.color);
   return e;
 }
 
@@ -57,6 +69,10 @@ Widget_scrollable_new ()
   Widget *e = ui_el_new_internal (WIDGET_SCROLLABLE);
   e->do_layout = Widget_layout_scrollable;
   e->scrollable.scroll_amount = 10.0;
+  Widget_set_on_event (e, EVENT_SCROLL_UP, uicb_widget_op,
+		       WidgetOpData_new (OP_SCROLLABLE_SCROLL, e, (vec2) { 0.0, -1.0 }));
+  Widget_set_on_event (e, EVENT_SCROLL_DOWN, uicb_widget_op,
+		       WidgetOpData_new (OP_SCROLLABLE_SCROLL, e, (vec2) { 0.0, 1.0 }));
   return e;
 }
 
@@ -67,6 +83,10 @@ Widget_scrollbar_new (Widget *target, gboolean horizontal)
   e->do_render = Widget_render_scrollbar;
   e->scrollbar.target = target;
   e->scrollbar.horizontal = horizontal;
+  e->on_event[EVENT_LEFT_DOWN] = uicb_scrollbar_start_scroll;
+  e->on_event[EVENT_MOUSE_MOVE] = uicb_scrollbar_scroll;
+  e->on_event[EVENT_LEFT_UP] = uicb_scrollbar_stop_scroll;
+  e->on_event[EVENT_MOUSE_LEAVE] = uicb_scrollbar_stop_scroll;
   return e;
 }
 
@@ -212,7 +232,7 @@ Widget_tick (Widget *widget)
 void
 Widget_render (Widget *widget, mat4 projection, int window_height)
 {
-  if (widget->do_layout)
+  if (widget->do_layout && widget->layout_dirty)
     {
       widget->do_layout (widget);
     }
@@ -228,3 +248,40 @@ Widget_render (Widget *widget, mat4 projection, int window_height)
       Widget_render (child, projection, window_height);
     }
 }
+
+void
+Widget_free (Widget *widget)
+{
+  if (!widget)
+    {
+      return;
+    }
+  
+  for (unsigned int i = 0; i < widget->children->len; ++i)
+    {
+      Widget *c = g_array_index (widget->children, Widget *, i);
+      Widget_free (c);
+    }
+  
+  g_array_free (widget->children, TRUE);
+
+  if (widget->kind == WIDGET_LABEL)
+    {
+      g_string_free (widget->label.text, TRUE);
+    }
+
+  if (widget->on_tick && widget->tick_data)
+    {
+      g_free (widget->tick_data);
+    }
+  
+  for (int ev = 0; ev < EVENT_COUNT; ++ev)
+    {
+      if (widget->on_event[ev] && widget->event_data[ev])
+	{
+	  g_free (widget->event_data[ev]);
+	}
+    }
+
+  g_free (widget);
+}
diff --git a/game/src/ui/widget_core.h b/game/src/ui/widget_core.h
index c1d739a..96cd1e4 100644
--- a/game/src/ui/widget_core.h
+++ b/game/src/ui/widget_core.h
@@ -5,6 +5,8 @@
 
 #include "widget_render.h"
 #include "widget_layout.h"
+#include "widget_style.h"
+#include "widget_ops.h"
 
 #include "../util.h"
 #include "../resources.h"
@@ -49,16 +51,11 @@ typedef enum WidgetEvent
     EVENT_MOUSE_LEAVE,
     EVENT_MOUSE_MOVE,
     EVENT_SCROLL_UP,
-    EVENT_SCROLL_DOWN
+    EVENT_SCROLL_DOWN,
+    
+    EVENT_COUNT
   } WidgetEvent;
 
-typedef struct ContainerWidget
-{
-  gboolean horizontal;
-  float padding;
-  float child_spacing;
-} ContainerWidget;
-
 typedef enum TextAlignment
   {
     TEXT_ALIGN_LEFT,
@@ -66,10 +63,14 @@ typedef enum TextAlignment
     TEXT_ALIGN_RIGHT
   } TextAlignment;
 
+typedef struct ContainerWidget
+{
+  gboolean horizontal;
+} ContainerWidget;
+
 typedef struct LabelWidget
 {
   GString *text;
-  vec4 color;
   TextAlignment text_alignment;
 } LabelWidget;
 
@@ -103,18 +104,16 @@ typedef struct Widget
   };
 
   gboolean visible;
-
+  gboolean layout_dirty;
+  gboolean hovered, clicked;
+  
   vec2 position;
   vec2 size;
   float layout_weight;
   float aspect_ratio;
-  
-  vec4 background_color;
-  unsigned int background_image;
-  WidgetIcon icon;
 
-  float border_width;
-  vec4 border_color;
+  WidgetStyle *style;
+  WidgetIcon icon;
 
   void (*do_layout) (struct Widget *);
   void (*do_render) (struct Widget *, mat4, int);
@@ -122,16 +121,15 @@ typedef struct Widget
   void (*on_tick) (struct Widget *, void *);
   void *tick_data;
   
-  void (*on_event[9]) (struct Widget *, void *);
-  void *event_data[9];
+  void (*on_event[EVENT_COUNT]) (struct Widget *, void *);
+  void *event_data[EVENT_COUNT];
 } Widget;
 
 Widget *Widget_plain_new ();
-Widget *Widget_container_new (gboolean horizontal, float padding, float child_spacing);
+Widget *Widget_container_new (gboolean horizontal);
 Widget *Widget_label_new (const char *text, TextAlignment alignment);
 Widget *Widget_scrollable_new ();
 Widget *Widget_scrollbar_new (Widget *target, gboolean horizontal);
-Widget *Widget_multiline_new (const char *text, TextAlignment alignment);
 
 void Widget_add_child (Widget *parent, Widget *child);
 void Widget_add_child_weighed (Widget *parent, Widget *child,
@@ -150,3 +148,4 @@ Widget *Widget_find_xy (Widget *widget, vec2 point);
 
 void Widget_tick (Widget *widget);
 void Widget_render (Widget *widget, mat4 projection, int window_height);
+void Widget_free (Widget *widget);
diff --git a/game/src/ui/widget_layout.c b/game/src/ui/widget_layout.c
index 5697a0f..733c49d 100644
--- a/game/src/ui/widget_layout.c
+++ b/game/src/ui/widget_layout.c
@@ -6,7 +6,8 @@ Widget_layout_container (Widget *self)
   float total_weights = 0.0;
   float total_fixed = 0.0;
   gboolean horizontal = self->container.horizontal;
-
+  WidgetStyle *style = self->style;
+  
   Widget *child;
   WIDGET_FOREACH_CHILD (self, i, child)
     {
@@ -14,13 +15,13 @@ Widget_layout_container (Widget *self)
 	{
 	  if (horizontal)
 	    {
-	      float h = self->size[1] - 2 * self->container.padding;
+	      float h = self->size[1] - 2 * style->layout_padding;
 	      child->size[1] = h;
 	      child->size[0] = h * child->aspect_ratio;
 	    }
 	  else
 	    {
-	      float w = self->size[0] - 2 * self->container.padding;
+	      float w = self->size[0] - 2 * style->layout_padding;
 	      child->size[0] = w;
 	      child->size[1] = w / child->aspect_ratio;
 	    }
@@ -33,11 +34,11 @@ Widget_layout_container (Widget *self)
 	}
     }
 
-  float spacing_total = glm_max (0, self->children->len - 1) * self->container.child_spacing;
+  float spacing_total = glm_max (0, self->children->len - 1) * style->layout_child_spacing;
   float total_size = (horizontal ? self->size[0] : self->size[1])
-    - 2.0 * self->container.padding - spacing_total;
+    - 2.0 * style->layout_padding - spacing_total;
   float weights_size = total_weights > 0.0 ? (total_size - total_fixed) / total_weights : 0;
-  float offset = self->container.padding;
+  float offset = style->layout_padding;
 
   WIDGET_FOREACH_CHILD (self, i, child)
     {
@@ -69,12 +70,12 @@ Widget_layout_container (Widget *self)
 	      if (horizontal)
 		{
 		  child->size[0] = size;
-		  child->size[1] = self->size[1] - 2 * self->container.padding;
+		  child->size[1] = self->size[1] - 2 * style->layout_padding;
 		}
 	      else
 		{
 		  child->size[1] = size;
-		  child->size[0] = self->size[0] - 2 * self->container.padding;
+		  child->size[0] = self->size[0] - 2 * style->layout_padding;
 		}
 	    }
 	}
@@ -82,15 +83,15 @@ Widget_layout_container (Widget *self)
       if (horizontal)
 	{
 	  VEC2_SETI (child->position, self->position[0] + offset,
-		     self->position[1] + self->container.padding);
+		     self->position[1] + style->layout_padding);
 	}
       else
 	{
-	  VEC2_SETI (child->position, self->position[0] + self->container.padding,
+	  VEC2_SETI (child->position, self->position[0] + style->layout_padding,
 		     self->position[1] + offset);
 	}
     
-      offset += size + self->container.child_spacing;
+      offset += size + style->layout_child_spacing;
     }
 }
 
diff --git a/game/src/ui/widget_ops.c b/game/src/ui/widget_ops.c
index 6eb98a1..0e48263 100644
--- a/game/src/ui/widget_ops.c
+++ b/game/src/ui/widget_ops.c
@@ -60,6 +60,8 @@ uicb_widget_op (Widget *self, void *userdata)
     }
 }
 
+/* Scrollbar boilerplate. */
+
 void
 uicb_scrollbar_start_scroll (Widget *self, void *userdata)
 {
diff --git a/game/src/ui/widget_ops.h b/game/src/ui/widget_ops.h
index 6237f9d..2519be5 100644
--- a/game/src/ui/widget_ops.h
+++ b/game/src/ui/widget_ops.h
@@ -10,10 +10,7 @@ typedef enum WidgetOp
     OP_LABEL_SHOW_INT,
     OP_LABEL_SHOW_FLOAT,
     OP_CHECKBOX_SHOW_FLAG,
-    OP_SCROLLABLE_SCROLL,
-    OP_SCROLLBAR_START_SCROLL,
-    OP_SCROLLBAR_SCROLL,
-    OP_SCROLLBAR_STOP_SCROLL
+    OP_SCROLLABLE_SCROLL
   } WidgetOp;
 
 typedef struct WidgetOpData
diff --git a/game/src/ui/widget_render.c b/game/src/ui/widget_render.c
index 882bd84..d61069f 100644
--- a/game/src/ui/widget_render.c
+++ b/game/src/ui/widget_render.c
@@ -20,19 +20,22 @@ Widget_render_base (Widget *self, mat4 projection, int window_height)
     {
       SimpleMesh_bind (&quad);
     }
+
+  WidgetStyle *style = self->style;
   
   program_use (RESPRG ("uiwidget"));
-  program_set_float (RESPRG ("uiwidget"), "border_width", self->border_width);
-  program_set_vec4 (RESPRG ("uiwidget"), "border_color", self->border_color);
+  program_set_float (RESPRG ("uiwidget"), "border_width", style->border_width);
+  program_set_vec4 (RESPRG ("uiwidget"), "border_color", style->border_color);
   program_set_vec2 (RESPRG ("uiwidget"), "widget_size", self->size);
 
-  program_set_int (RESPRG ("uiwidget"), "has_background_image", self->background_image != 0);
-  texture_use (self->background_image, 0); /* If it doesn't have a texture, it'll be 0 anyway. */
+  program_set_int (RESPRG ("uiwidget"), "has_background_image", style->background_image != 0);
+  texture_use (style->background_image, 0); /* If it doesn't have a texture, it'll be 0 anyway. */
 
-  program_set_vec4 (RESPRG ("uiwidget"), "background_color", self->background_color);
+  program_set_vec4 (RESPRG ("uiwidget"), "background_color", style->background_color);
 
   program_set_int (RESPRG ("uiwidget"), "has_icon", self->icon != -1);
   program_set_float (RESPRG ("uiwidget"), "icon_index", self->icon);
+  program_set_vec4 (RESPRG ("uiwidget"), "icon_color", style->icon_color);
   texture_use (RESTEX ("icons"), 1);
 
   mat3 model;
@@ -78,9 +81,12 @@ void
 Widget_render_label (Widget *self, mat4 projection, int window_height)
 {
   Widget_render_base (self, projection, window_height);
+
+  WidgetStyle *style = self->style;
   
   program_use (RESPRG ("uitext"));
   program_set_mat4 (RESPRG ("uitext"), "projection", projection);
+  program_set_vec4 (RESPRG ("uitext"), "color", style->text_color);
   texture_use (RESTEX ("font0"), 0);
   
   float char_width = self->size[1] * 0.5;
@@ -106,7 +112,6 @@ Widget_render_label (Widget *self, mat4 projection, int window_height)
       gunichar ch = g_utf8_get_char (p);
 
       program_set_float (RESPRG ("uitext"), "character", ch);
-      program_set_vec4 (RESPRG ("uitext"), "color", self->label.color);
 
       mat3 model;
       glm_translate2d_make (model, (vec2) { self->position[0] + offset + char_width, self->position[1] });
@@ -143,7 +148,7 @@ Widget_render_scrollbar (Widget *self, mat4 projection, int window_height)
   program_set_vec2 (RESPRG ("uiwidget"), "scrollbar_size", self->scrollbar.horizontal
 		    ? (vec2) { thumb_size_norm, 1.0f }
 		    : (vec2) { 1.0f, thumb_size_norm });
-  program_set_int (RESPRG ("uiwidget"), "has_scrollbar", FALSE);
-  
+
   Widget_render_base (self, projection, window_height);
+  program_set_int (RESPRG ("uiwidget"), "has_scrollbar", FALSE);
 }
diff --git a/game/src/ui/widget_style.h b/game/src/ui/widget_style.h
new file mode 100644
index 0000000..84ac3de
--- /dev/null
+++ b/game/src/ui/widget_style.h
@@ -0,0 +1,20 @@
+#pragma once
+
+#include "widget_fw.h"
+#include "widget_core.h"
+
+typedef struct WidgetStyle
+{
+  vec4 background_color;
+  vec4 text_color;
+  vec4 icon_color;
+  vec4 border_color;
+
+  float border_width;
+  /* The two below apply only to container widgets. */
+  float layout_padding;
+  float layout_child_spacing;
+
+  unsigned int background_image;
+} WidgetStyle;
+