Implement button component

CMakeLists.txt

@@ -43,6 +43,7 @@ add_subdirectory("res")
 
 set(components
     building
+    button
     camera
     container
     font

src/button/CMakeLists.txt

@@ -0,0 +1,3 @@
+add_library(button "src/button.c")
+target_include_directories(button PUBLIC "inc")
+target_link_libraries(button PUBLIC gfx PRIVATE font)

src/button/inc/button.h

@@ -0,0 +1,36 @@
+#ifndef BUTTON_H
+#define BUTTON_H
+
+#include <gfx.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+enum
+{
+    BUTTON_LEFT,
+    BUTTON_MID,
+    BUTTON_RIGHT,
+
+    MAX_BUTTON_SPRITES
+};
+
+struct button
+{
+    const char *text;
+    short x, y, w;
+};
+
+bool button_is_pressed(const struct button *b);
+int button_render(const struct button *b);
+
+extern struct sprite button_sprites[MAX_BUTTON_SPRITES];
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* BUTTON_H */

src/button/src/button.c

@@ -0,0 +1,100 @@
+#include <button.h>
+#include <font.h>
+#include <gfx.h>
+
+struct sprite button_sprites[MAX_BUTTON_SPRITES];
+
+bool button_is_pressed(const struct button *const b)
+{
+    return false;
+}
+
+static int render_left(const struct button *const b, short *const x)
+{
+    sprite_get_or_ret(s, -1);
+
+    if (sprite_clone(&button_sprites[BUTTON_LEFT], s))
+        return -1;
+
+    s->x = b->x;
+    s->y = b->y;
+    sprite_sort(s);
+    *x = s->x + s->w;
+    return 0;
+}
+
+static int render_mid(const struct button *const b, short *const x)
+{
+    const short mid_w = button_sprites[BUTTON_MID].w;
+    const short lw = button_sprites[BUTTON_LEFT].w;
+    const short rw = button_sprites[BUTTON_RIGHT].w;
+    const short w = b->w - lw - rw;
+
+    if (w > 0)
+    {
+        const short rem_mid = w > 0 ? w % mid_w : 0;
+        const short whole_mid = w / mid_w;
+        const short n_mid = rem_mid ? whole_mid + 1 : whole_mid;
+
+        for (struct
+            {
+                size_t i;
+                short x;
+            } a = {.i = 0, .x = lw};
+            a.i < n_mid;
+            a.i++, a.x += mid_w)
+        {
+            sprite_get_or_ret(m, -1);
+
+            if (sprite_clone(&button_sprites[BUTTON_MID], m))
+                return -1;
+
+            m->x = *x;
+            m->y = b->y;
+
+            if (rem_mid && a.i + 1 == n_mid)
+                m->w = rem_mid;
+            else
+                m->w = mid_w;
+
+            sprite_sort(m);
+            *x += m->w;
+        }
+    }
+
+    return 0;
+}
+
+static int render_right(const struct button *const b, const short *const x)
+{
+    sprite_get_or_ret(s, -1);
+
+    if (sprite_clone(&button_sprites[BUTTON_RIGHT], s))
+        return -1;
+
+    s->x = *x;
+    s->y = b->y;
+    sprite_sort(s);
+    return 0;
+}
+
+static int render_text(const struct button *const b)
+{
+    const short x = b->x + button_sprites[BUTTON_LEFT].w,
+        y = b->y + (button_sprites[BUTTON_MID].h >> 2);
+
+    return font_printf(FONT, x, y, "%s", b->text) < 0;
+}
+
+int button_render(const struct button *const b)
+{
+    short x;
+
+    if (render_left(b, &x)
+        || render_mid(b, &x)
+        || render_right(b, &x)
+        || render_text(b))
+        return -1;
+
+    return 0;
+}

src/game/CMakeLists.txt

@@ -2,6 +2,7 @@ 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

src/game/src/res.c

@@ -1,5 +1,6 @@
 #include <game_private.h>
 #include <building.h>
+#include <button.h>
 #include <container.h>
 #include <font.h>
 #include <gfx.h>
@@ -216,7 +217,34 @@ static const struct container c[] =
         {
             .sound = &unit_sounds[UNIT_SOUND_SELECTED]
         }
-    }
+    },
+
+    {
+        .path = "btn_left",
+        .type = CONTAINER_TYPE_SPRITE,
+        .data =
+        {
+            .sprite = &button_sprites[BUTTON_LEFT]
+        }
+    },
+
+    {
+        .path = "btn_mid",
+        .type = CONTAINER_TYPE_SPRITE,
+        .data =
+        {
+            .sprite = &button_sprites[BUTTON_MID]
+        }
+    },
+
+    {
+        .path = "btn_right",
+        .type = CONTAINER_TYPE_SPRITE,
+        .data =
+        {
+            .sprite = &button_sprites[BUTTON_RIGHT]
+        }
+    },
 };
 
 static bool init;