Revamp gui component

`gui` was tighly coupled to game logic, and could not be extended for
other purposes. Therefore, a generic GUI implementation, loosely
inspired by well-known GUI frameworks such as GTK, is now provided, with
the following properties:

- Does not depend on dynamic or static memory allocation, only automatic
(i.e., stack) memory allocation required.
- Portable among existing implementations.
- Simple to extend.
- Tiny memory footprint.

`gui` is now composed by GUI elements that can be chained to form a tree
structure. This is useful e.g.: to calculate X/Y coordinates for a given
GUI element given its parent(s).

This commit also refactors the older implementation, moving
game-specific logic into `player` and making use of the new component.

2 files changed, 15 insertions, 15 deletions

diff --git a/src/game/CMakeLists.txt b/src/game/CMakeLists.txt
index 3eeef87..0c21b0c 100644
--- a/src/game/CMakeLists.txt
+++ b/src/game/CMakeLists.txt
@@ -2,7 +2,6 @@ add_library(game "src/game.c" "src/res.c")
 target_include_directories(game PUBLIC "inc" PRIVATE "privinc")
 target_link_libraries(game PRIVATE
     building
-    button
     container
     font
     gfx
diff --git a/src/game/src/res.c b/src/game/src/res.c
index 093fc45..c41af47 100644
--- a/src/game/src/res.c
+++ b/src/game/src/res.c
@@ -1,10 +1,11 @@
 #include <game_private.h>
 #include <building.h>
-#include <button.h>
 #include <container.h>
 #include <font.h>
 #include <gfx.h>
-#include <gui.h>
+#include <gui/bar.h>
+#include <gui/button.h>
+#include <gui/rounded_rect.h>
 #include <resource.h>
 #include <terrain.h>
 #include <unit.h>
@@ -89,7 +90,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &gui_sprites[GUI_BAR_LEFT]
+            .sprite = &gui_bar_sprites[GUI_BAR_LEFT]
         }
     },
 
@@ -98,7 +99,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &gui_sprites[GUI_BAR_MID]
+            .sprite = &gui_bar_sprites[GUI_BAR_MID]
         }
     },
 
@@ -107,7 +108,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &gui_sprites[GUI_BAR_RIGHT]
+            .sprite = &gui_bar_sprites[GUI_BAR_RIGHT]
         }
     },
 
@@ -116,7 +117,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &gui_sprites[GUI_SELECTION_UP_LEFT]
+            .sprite = &gui_rounded_rect_sprites[GUI_ROUNDED_RECT_UP_LEFT]
         }
     },
 
@@ -125,7 +126,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &gui_sprites[GUI_SELECTION_UP_RIGHT]
+            .sprite = &gui_rounded_rect_sprites[GUI_ROUNDED_RECT_UP_RIGHT]
         }
     },
 
@@ -134,7 +135,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &gui_sprites[GUI_SELECTION_DOWN_LEFT]
+            .sprite = &gui_rounded_rect_sprites[GUI_ROUNDED_RECT_DOWN_LEFT]
         }
     },
 
@@ -143,7 +144,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &gui_sprites[GUI_SELECTION_DOWN_RIGHT]
+            .sprite = &gui_rounded_rect_sprites[GUI_ROUNDED_RECT_DOWN_RIGHT]
         }
     },
 
@@ -152,7 +153,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &gui_sprites[GUI_SELECTION_MID]
+            .sprite = &gui_rounded_rect_sprites[GUI_ROUNDED_RECT_MID]
         }
     },
 
@@ -161,7 +162,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &gui_sprites[GUI_SELECTION_MID_VERT]
+            .sprite = &gui_rounded_rect_sprites[GUI_ROUNDED_RECT_MID_VERT]
         }
     },
 
@@ -224,7 +225,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &button_sprites[BUTTON_LEFT]
+            .sprite = &gui_button_sprites[GUI_BUTTON_LEFT]
         }
     },
 
@@ -233,7 +234,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &button_sprites[BUTTON_MID]
+            .sprite = &gui_button_sprites[GUI_BUTTON_MID]
         }
     },
 
@@ -242,7 +243,7 @@ static const struct container c[] =
         .type = CONTAINER_TYPE_SPRITE,
         .data =
         {
-            .sprite = &button_sprites[BUTTON_RIGHT]
+            .sprite = &gui_button_sprites[GUI_BUTTON_RIGHT]
         }
     },
 };