Split peripheral-related logic into its own component

This has several advantages:

- `camera` no longer needs to define public functions for each
peripheral type.
- Peripheral-related is now no longer tighly coupled to human_player,
so peripheral logic can be reused elsewhere e.g.: on menus.
- Makes camera_update_touch consistent compared to equivalent functions,
since now `pan` has now been moved to `camera` (as it should be).

13 files changed, 165 insertions, 78 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index f04b6e3..7e96f88 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -55,6 +55,7 @@ set(components
     keyboard
     mouse
     pad
+    peripheral
     player
     resource
     sfx
diff --git a/src/camera/CMakeLists.txt b/src/camera/CMakeLists.txt
index f234098..1cb1f63 100644
--- a/src/camera/CMakeLists.txt
+++ b/src/camera/CMakeLists.txt
@@ -1,3 +1,3 @@
 add_library(camera "src/camera.c" "src/pad.c" "src/mouse.c" "src/touch.c")
 target_include_directories(camera PUBLIC "inc" PRIVATE "privinc")
-target_link_libraries(camera PUBLIC container mouse pad terrain util PRIVATE gfx)
+target_link_libraries(camera PUBLIC container mouse pad peripheral terrain util PRIVATE gfx)
diff --git a/src/camera/inc/camera.h b/src/camera/inc/camera.h
index 93ad740..8356bd8 100644
--- a/src/camera/inc/camera.h
+++ b/src/camera/inc/camera.h
@@ -3,6 +3,7 @@
 
 #include <mouse.h>
 #include <pad.h>
+#include <peripheral.h>
 #include <util.h>
 #include <stdbool.h>
 
@@ -15,6 +16,7 @@ struct camera
 {
     int x, y, x_speed, y_speed;
     unsigned int xt, yt;
+    bool pan;
 
     struct cursor
     {
@@ -33,9 +35,7 @@ struct camera
 
 extern struct sprite cursor_sprite;
 
-void camera_update_pad(struct camera *cam, const struct pad *p);
-void camera_update_mouse(struct camera *cam, const struct mouse *m);
-bool camera_update_touch(struct camera *cam, const struct mouse *m);
+void camera_update(struct camera *cam, const union peripheral *p);
 bool camera_translate(const struct camera *cam, const struct util_rect *dim, short *x, short *y);
 void cursor_init(struct cursor *c);
 bool cursor_collision(const struct camera *cam, const struct util_rect *d);
diff --git a/src/camera/privinc/camera_private.h b/src/camera/privinc/camera_private.h
index b9f4773..c3cb64c 100644
--- a/src/camera/privinc/camera_private.h
+++ b/src/camera/privinc/camera_private.h
@@ -15,6 +15,9 @@ enum
 };
 
 void camera_update_pos(struct camera *cam);
+void camera_update_pad(struct camera *cam, const struct pad *p);
+void camera_update_mouse(struct camera *cam, const struct mouse *m);
+void camera_update_touch(struct camera *cam, const struct mouse *m);
 
 #ifdef __cplusplus
 }
diff --git a/src/camera/src/camera.c b/src/camera/src/camera.c
index 0b96629..73f8bf4 100644
--- a/src/camera/src/camera.c
+++ b/src/camera/src/camera.c
@@ -103,3 +103,21 @@ bool camera_translate(const struct camera *const cam, const struct util_rect *co
     *y = ty;
     return true;
 }
+
+void camera_update(struct camera *const cam, const union peripheral *const p)
+{
+    switch (p->common.type)
+    {
+        case PERIPHERAL_TYPE_PAD:
+            camera_update_pad(cam, &p->pad.pad);
+            break;
+
+        case PERIPHERAL_TYPE_KEYBOARD_MOUSE:
+            camera_update_mouse(cam, &p->kbm.mouse);
+            break;
+
+        case PERIPHERAL_TYPE_TOUCH:
+            camera_update_touch(cam, &p->kbm.mouse);
+            break;
+    }
+}
diff --git a/src/camera/src/pad.c b/src/camera/src/pad.c
index 79c05ff..d61ef8b 100644
--- a/src/camera/src/pad.c
+++ b/src/camera/src/pad.c
@@ -2,6 +2,7 @@
 #include <camera_private.h>
 #include <pad.h>
 #include <terrain.h>
+#include <peripheral.h>
 #include <util.h>
 #include <stdbool.h>
 
diff --git a/src/camera/src/touch.c b/src/camera/src/touch.c
index 475b308..e4fc118 100644
--- a/src/camera/src/touch.c
+++ b/src/camera/src/touch.c
@@ -13,9 +13,8 @@ static void cursor_update(struct cursor *const c, const struct mouse *const m)
     c->y = m->y;
 }
 
-static bool update_speed(struct camera *const cam, const struct mouse *const m)
+static void update_speed(struct camera *const cam, const struct mouse *const m)
 {
-    bool ret = false;
     int *const sx = &cam->x_speed, *const sy = &cam->y_speed;
 
     if (mouse_pressed(m, MOUSE_BUTTON_LEFT))
@@ -23,7 +22,7 @@ static bool update_speed(struct camera *const cam, const struct mouse *const m)
         *sx = m->dx;
         *sy = m->dy;
 
-        ret = *sx || *sy;
+        cam->pan = *sx || *sy;
     }
     else if (*sx || *sy)
     {
@@ -41,17 +40,11 @@ static bool update_speed(struct camera *const cam, const struct mouse *const m)
         else
             *sy = 0;
     }
-
-    return ret;
 }
 
-bool camera_update_touch(struct camera *const cam, const struct mouse *const m)
+void camera_update_touch(struct camera *const cam, const struct mouse *const m)
 {
-    bool ret;
-
     cursor_update(&cam->cursor, m);
-    ret = update_speed(cam, m);
+    update_speed(cam, m);
     camera_update_pos(cam);
-
-    return ret;
 }
diff --git a/src/game/src/game.c b/src/game/src/game.c
index dede611..3c03dd5 100644
--- a/src/game/src/game.c
+++ b/src/game/src/game.c
@@ -26,7 +26,7 @@ int game(void)
     {
         const struct human_player_cfg cfg =
         {
-            .sel_periph = HUMAN_PLAYER_PERIPH_TOUCH,
+            .sel_periph = PERIPHERAL_TYPE_KEYBOARD_MOUSE,
             .padn = i,
             .pl =
             {
diff --git a/src/peripheral/CMakeLists.txt b/src/peripheral/CMakeLists.txt
new file mode 100644
index 0000000..9666a5c
--- /dev/null
+++ b/src/peripheral/CMakeLists.txt
@@ -0,0 +1,3 @@
+add_library(peripheral "src/peripheral.c")
+target_include_directories(peripheral PUBLIC "inc")
+target_link_libraries(peripheral PUBLIC pad mouse keyboard util)
diff --git a/src/peripheral/inc/peripheral.h b/src/peripheral/inc/peripheral.h
new file mode 100644
index 0000000..c405c3c
--- /dev/null
+++ b/src/peripheral/inc/peripheral.h
@@ -0,0 +1,64 @@
+#ifndef PERIPHERAL_H
+#define PERIPHERAL_H
+
+#include <pad.h>
+#include <keyboard.h>
+#include <mouse.h>
+#include <util.h>
+#include <stddef.h>
+#include <stdbool.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+enum peripheral_type
+{
+    PERIPHERAL_TYPE_PAD,
+    PERIPHERAL_TYPE_TOUCH,
+    PERIPHERAL_TYPE_KEYBOARD_MOUSE
+};
+
+union peripheral
+{
+    struct peripheral_common
+    {
+        enum peripheral_type type;
+    } common;
+
+    struct peripheral_pad
+    {
+        struct peripheral_common common;
+        struct pad pad;
+    } pad;
+
+    struct peripheral_kbm
+    {
+        struct peripheral_common common;
+        struct mouse mouse;
+        struct keyboard keyboard;
+        bool long_press;
+        unsigned int lp_t;
+    } kbm;
+};
+
+struct peripheral_cfg
+{
+    enum peripheral_type type;
+    int padn;
+};
+
+UTIL_STATIC_ASSERT(!offsetof(struct peripheral_pad, common),
+    "unexpected offsetof for struct peripheral_pad");
+UTIL_STATIC_ASSERT(!offsetof(struct peripheral_kbm, common),
+    "unexpected offsetof for struct peripheral_kbm");
+
+void peripheral_init(const struct peripheral_cfg *cfg, union peripheral *p);
+void peripheral_update(union peripheral *p);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* PERIPHERAL_H */
diff --git a/src/peripheral/src/peripheral.c b/src/peripheral/src/peripheral.c
new file mode 100644
index 0000000..a1f61be
--- /dev/null
+++ b/src/peripheral/src/peripheral.c
@@ -0,0 +1,41 @@
+#include <peripheral.h>
+#include <keyboard.h>
+#include <mouse.h>
+#include <pad.h>
+
+void peripheral_update(union peripheral *const p)
+{
+    switch (p->common.type)
+    {
+        case PERIPHERAL_TYPE_TOUCH:
+            /* Fall through. */
+        case PERIPHERAL_TYPE_KEYBOARD_MOUSE:
+            mouse_update(&p->kbm.mouse);
+            keyboard_update(&p->kbm.keyboard);
+            break;
+
+        case PERIPHERAL_TYPE_PAD:
+            pad_update(&p->pad.pad);
+            break;
+    }
+}
+
+void peripheral_init(const struct peripheral_cfg *const cfg,
+    union peripheral *const p)
+{
+    *p = (const union peripheral){0};
+
+    switch (p->common.type = cfg->type)
+    {
+        case PERIPHERAL_TYPE_TOUCH:
+            /* Fall through. */
+        case PERIPHERAL_TYPE_KEYBOARD_MOUSE:
+            mouse_init(&p->kbm.mouse);
+            keyboard_init(&p->kbm.keyboard);
+            break;
+
+        case PERIPHERAL_TYPE_PAD:
+            pad_init(cfg->padn, &p->pad.pad);
+            break;
+    }
+}
diff --git a/src/player/inc/human_player.h b/src/player/inc/human_player.h
index 08f47d9..ca52112 100644
--- a/src/player/inc/human_player.h
+++ b/src/player/inc/human_player.h
@@ -6,6 +6,7 @@
 #include <instance.h>
 #include <mouse.h>
 #include <pad.h>
+#include <peripheral.h>
 #include <player.h>
 #include <stdbool.h>
 #include <stddef.h>
@@ -19,35 +20,17 @@ enum {MAX_SELECTED_INSTANCES = 4};
 
 struct human_player_cfg
 {
-    enum human_player_periph
-    {
-        HUMAN_PLAYER_PERIPH_PAD,
-        HUMAN_PLAYER_PERIPH_TOUCH,
-        HUMAN_PLAYER_PERIPH_KEYBOARD_MOUSE
-    } sel_periph;
-
+    enum peripheral_type sel_periph;
     struct player_cfg pl;
     int padn;
+    struct camera_dim dim;
 };
 
 struct human_player
 {
     struct player pl;
     struct camera cam;
-    enum human_player_periph sel_periph;
-
-    union
-    {
-        struct pad pad;
-
-        struct human_player_kbm
-        {
-            struct mouse mouse;
-            struct keyboard keyboard;
-            bool long_press, pan;
-            unsigned int lp_t;
-        } kbm;
-    } periph;
+    union peripheral periph;
 
     struct sel_instance
     {
diff --git a/src/player/src/human_player.c b/src/player/src/human_player.c
index 3430035..14e4680 100644
--- a/src/player/src/human_player.c
+++ b/src/player/src/human_player.c
@@ -528,9 +528,7 @@ static bool update_from_pad(struct human_player *const h,
     struct player_others *const o)
 {
     bool ret = false;
-    struct pad *const p = &h->periph.pad;
-
-    pad_update(p);
+    struct pad *const p = &h->periph.pad.pad;
 
     if (pad_justpressed(p, PAD_KEY_OPTIONS)
         || pad_justpressed(p, PAD_KEY_EXIT))
@@ -565,13 +563,10 @@ static bool update_from_touch(struct human_player *const h,
 {
     struct mouse *const m = &h->periph.kbm.mouse;
     struct keyboard *const k = &h->periph.kbm.keyboard;
+    struct peripheral_kbm *const kbm = &h->periph.kbm;
+    bool *const pan = &h->cam.pan;
 
-    mouse_update(m);
-    keyboard_update(k);
-
-    struct human_player_kbm *const kbm = &h->periph.kbm;
-
-    if (mouse_pressed(m, MOUSE_BUTTON_LEFT) && !kbm->pan)
+    if (mouse_pressed(m, MOUSE_BUTTON_LEFT) && !*pan)
     {
         enum {LONG_PRESS_THRESHOLD = 30};
 
@@ -585,10 +580,10 @@ static bool update_from_touch(struct human_player *const h,
     }
     else if (mouse_justreleased(m, MOUSE_BUTTON_LEFT))
     {
-        if (!kbm->pan && !select_instances(h, o, false, true))
+        if (!*pan && !select_instances(h, o, false, true))
             move_units(h, o);
 
-        kbm->pan = false;
+        *pan = false;
         kbm->long_press = false;
         kbm->lp_t = 0;
     }
@@ -602,9 +597,6 @@ static bool update_from_keyboard_mouse(struct human_player *const h,
     struct mouse *const m = &h->periph.kbm.mouse;
     struct keyboard *const k = &h->periph.kbm.keyboard;
 
-    mouse_update(m);
-    keyboard_update(k);
-
     if (mouse_justreleased(m, MOUSE_BUTTON_LEFT))
     {
         const bool shift_pressed =
@@ -631,29 +623,24 @@ bool human_player_update(struct human_player *const h,
         gui_update(h);
         update_selected(h);
         update_target(h);
+        peripheral_update(&h->periph);
 
-        switch (h->sel_periph)
+        switch (h->periph.common.type)
         {
-            case HUMAN_PLAYER_PERIPH_PAD:
+            case PERIPHERAL_TYPE_PAD:
                 ret = update_from_pad(h, o);
-                camera_update_pad(&h->cam, &h->periph.pad);
                 break;
 
-            case HUMAN_PLAYER_PERIPH_TOUCH:
-            {
-                struct human_player_kbm *const kbm = &h->periph.kbm;
-
+            case PERIPHERAL_TYPE_TOUCH:
                 ret = update_from_touch(h, o);
-                kbm->pan |= camera_update_touch(&h->cam, &kbm->mouse);
-            }
                 break;
 
-            case HUMAN_PLAYER_PERIPH_KEYBOARD_MOUSE:
+            case PERIPHERAL_TYPE_KEYBOARD_MOUSE:
                 ret = update_from_keyboard_mouse(h, o);
-                camera_update_mouse(&h->cam, &h->periph.kbm.mouse);
                 break;
         }
 
+        camera_update(&h->cam, &h->periph);
         player_update(p);
     }
 
@@ -730,15 +717,15 @@ int human_player_render(const struct human_player *const h,
         || gui_render(h))
         return -1;
 
-    switch (h->sel_periph)
+    switch (h->periph.common.type)
     {
-        case HUMAN_PLAYER_PERIPH_PAD:
+        case PERIPHERAL_TYPE_PAD:
             /* Fall through. */
-        case HUMAN_PLAYER_PERIPH_KEYBOARD_MOUSE:
+        case PERIPHERAL_TYPE_KEYBOARD_MOUSE:
             cursor_render(&h->cam.cursor);
             break;
 
-        case HUMAN_PLAYER_PERIPH_TOUCH:
+        case PERIPHERAL_TYPE_TOUCH:
             break;
 
         default:
@@ -756,20 +743,13 @@ int human_player_init(const struct human_player_cfg *const cfg,
     if (player_init(&cfg->pl, &h->pl))
         return -1;
 
-    switch (h->sel_periph = cfg->sel_periph)
+    const struct peripheral_cfg p_cfg =
     {
-        case HUMAN_PLAYER_PERIPH_TOUCH:
-            /* Fall through. */
-        case HUMAN_PLAYER_PERIPH_KEYBOARD_MOUSE:
-            mouse_init(&h->periph.kbm.mouse);
-            keyboard_init(&h->periph.kbm.keyboard);
-            break;
-
-        case HUMAN_PLAYER_PERIPH_PAD:
-            pad_init(cfg->padn, &h->periph.pad);
-            break;
-    }
+        .type = cfg->sel_periph,
+        .padn = cfg->padn
+    };
 
+    peripheral_init(&p_cfg, &h->periph);
     cursor_init(&h->cam.cursor);
     h->top_gui = true;
     memmove(h->gui_res, h->pl.resources, sizeof h->gui_res);