view zooming & panning

src/game.c

@@ -139,67 +139,6 @@ INTERNAL void game_update(void)
     if (!run) {
         run = 1;
 
-        /* Create moving ents */
-        {
-            f32 start_x = -1;
-            f32 start_y = -1;
-            struct v2 draw_size = V2(0.25f, 0.25f);
-            {
-                struct entity *e = entity_alloc();
-                e->active = true;
-                e->start_pos = V2(start_x, start_y);
-                entity_enable_prop(e, ENTITY_PROP_TEST);
-                entity_enable_prop(e, ENTITY_PROP_TEXTURED);
-                e->draw_size = draw_size;
-                e->texture_name = STR("res/graphics/timmy.ase");
-            }
-            {
-                struct entity *e = entity_alloc();
-                e->active = true;
-                e->start_pos = V2(start_x + 0.5f, start_y);
-                entity_enable_prop(e, ENTITY_PROP_TEST);
-
-                entity_enable_prop(e, ENTITY_PROP_TEXTURED);
-                e->draw_size = draw_size;
-                e->texture_name = STR("res/graphics/bla.ase");
-
-                entity_start_animation(e, STR("Test"), ANIMATION_FLAG_LOOPING);
-            }
-            {
-                struct entity *e = entity_alloc();
-                e->active = true;
-                e->start_pos = V2(start_x + 1.f, start_y);
-                entity_enable_prop(e, ENTITY_PROP_TEST);
-                entity_enable_prop(e, ENTITY_PROP_TEXTURED);
-                e->draw_size = draw_size;
-                e->texture_name = STR("res/graphics/floor_tiles.ase");
-
-                entity_start_animation(e, STR("Test"), ANIMATION_FLAG_LOOPING);
-            }
-            {
-                struct entity *e = entity_alloc();
-                e->active = true;
-                e->start_pos = V2(start_x + 1.5f, start_y);
-                entity_enable_prop(e, ENTITY_PROP_TEST);
-                entity_enable_prop(e, ENTITY_PROP_TEXTURED);
-                e->draw_size = draw_size;
-                e->texture_name = STR("res/graphics/white.ase");
-
-                entity_start_animation(e, STR("Test"), ANIMATION_FLAG_LOOPING);
-            }
-            {
-                struct entity *e = entity_alloc();
-                e->active = true;
-                e->start_pos = V2(start_x + 2.f, start_y);
-                entity_enable_prop(e, ENTITY_PROP_TEST);
-                entity_enable_prop(e, ENTITY_PROP_TEXTURED);
-                e->draw_size = draw_size;
-                e->texture_name = STR("res/graphics/bad.ase");
-
-                entity_start_animation(e, STR("Test"), ANIMATION_FLAG_LOOPING);
-            }
-        }
-
         /* Player ent */
         {
             struct entity *e = entity_alloc();
@@ -214,38 +153,6 @@ INTERNAL void game_update(void)
             f32 meters_height = sheet->image_size.y / PIXELS_PER_UNIT;
             e->draw_size = V2(meters_width, meters_height);
         }
-
-        /* Screen center ent */
-        {
-            struct entity *e = entity_alloc();
-            e->active = true;
-            e->pos = V2(0, 0);
-            entity_enable_prop(e, ENTITY_PROP_TEST);
-            //entity_enable_prop(e, ENTITY_PROP_TEST_FOLLOW_MOUSE);
-
-            e->sound_name = STR("res/sounds/test2.mp3");
-            e->sound_desc = MIXER_DESC(
-                .volume = 1.0,
-                .flags = MIXER_FLAG_SPATIALIZE,
-                .looping = true,
-            );
-            entity_enable_prop(e, ENTITY_PROP_TEST_SOUND_EMITTER);
-
-            e->draw_size = V2(0.05, 0.05);
-            e->texture_name = STR("res/graphics/bad.ase");
-            entity_enable_prop(e, ENTITY_PROP_TEXTURED);
-        }
-        {
-            struct entity *e = entity_alloc();
-            e->active = true;
-            e->pos = V2(0, 0);
-            entity_enable_prop(e, ENTITY_PROP_TEXTURED);
-            //entity_enable_prop(e, ENTITY_PROP_TEST);
-            entity_enable_prop(e, ENTITY_PROP_TEST_FOLLOW_MOUSE);
-            e->draw_size = V2(0.5, 0.5);
-            e->texture_name = STR("res/graphics/bla.ase");
-            entity_start_animation(e, STR("Test"), ANIMATION_FLAG_LOOPING);
-        }
     }
 
     /* ========================== *

src/string.c

@@ -102,13 +102,13 @@ struct string string_from_float(struct arena *arena, f64 f, u32 precision)
 
     /* Currently this function doesn't support large floats. We should
      * rewrite this function if this needs to change. */
-    b32 unrepresentable = (f >= (f64)((u64)1 << 63));
+    f64 max_representable = (f64)((u64)1 << 62);
+    b32 too_large = (f >= max_representable) || (f <= -max_representable);
     b32 nan = f != f;
 
-
     if (nan) {
         final_len += string_cpy(arena, STR("NaN")).len;
-    } else if (unrepresentable) {
+    } else if (too_large) {
         string_from_char(arena, '?');
         ++final_len;
     } else {

src/sys_win32.c

@@ -870,7 +870,17 @@ INTERNAL LRESULT CALLBACK win32_window_proc(HWND hwnd, UINT msg, WPARAM wparam,
             }
         } break;
 
-        /* TODO: Mouse wheel */
+        case WM_MOUSEWHEEL: {
+            int delta = GET_WHEEL_DELTA_WPARAM(wparam);
+            i32 dir = delta >= 0 ? 1 : -1;
+            enum sys_btn button = dir >= 0 ? SYS_BTN_MWHEELUP : SYS_BTN_MWHEELDOWN;
+            for (i32 i = 0; i < (dir * delta); i += WHEEL_DELTA) {
+                /* Send a button down & button up event simultaneously */
+                win32_window_process_event(window, (struct sys_event) { .kind = SYS_EVENT_KIND_BUTTON_DOWN, .button = button });
+                win32_window_process_event(window, (struct sys_event) { .kind = SYS_EVENT_KIND_BUTTON_UP, .button = button });
+            }
+        } break;
+
 
         default: {
             result = DefWindowProcA(hwnd, msg, wparam, lparam);

src/user.c

@@ -39,6 +39,9 @@ GLOBAL struct {
     struct view world_view;
     struct tick blend_ticks[2];
 
+    b32 panning;
+    struct v2 panning_from;
+
     /* User thread input */
     struct sys_mutex sys_events_mutex;
     struct arena sys_events_arena;
@@ -51,17 +54,6 @@ GLOBAL struct {
     struct v2 screen_mouse;
 } L = { 0 } DEBUG_LVAR(L_user);
 
-/* ========================== *
- * View
- * ========================== */
-
-INTERNAL struct mat3x3 view_get_xform(struct view view)
-{
-    f32 scale = view.zoom * view.px_per_unit;
-    struct mat3x3 res = mat3x3_from_trs_pivot(v2_sub(L.screen_center, view.center), view.rot, V2(scale, scale), view.center);
-    return res;
-}
-
 /* ========================== *
  * Window -> user communication
  * ========================== */
@@ -183,6 +175,29 @@ INTERNAL void push_game_cmds(struct game_cmd_list *list)
     scratch_end(scratch);
 }
 
+/* ========================== *
+ * View
+ * ========================== */
+
+INTERNAL struct mat3x3 view_get_xform(struct view view)
+{
+    f32 scale = view.zoom * view.px_per_unit;
+    struct mat3x3 res = mat3x3_from_trs_pivot(v2_sub(L.screen_center, view.center), view.rot, V2(scale, scale), view.center);
+    return res;
+}
+
+INTERNAL struct v2 view_inverse_point(struct view view, struct v2 p)
+{
+    struct mat3x3 mtx_inverse = mat3x3_inverse(view_get_xform(view));
+    struct v3 p_inverse = mat3x3_mul_v3(mtx_inverse, V3(p.x, p.y, 1));
+    return V2(p_inverse.x, p_inverse.y);
+}
+
+INTERNAL struct v2 view_mouse_pos(struct view view)
+{
+    return view_inverse_point(view, L.screen_mouse);
+}
+
 /* ========================== *
  * Update
  * ========================== */
@@ -213,12 +228,12 @@ INTERNAL void user_update(void)
     L.screen_mouse = sys_window_get_mouse_pos(L.window);
     struct sys_event_array events = pull_sys_events(scratch.arena);
 
-    /* TODO: remove this (testing) */
+    i32 zooms_to_apply = 0;
     for (u64 i = 0; i < events.count; ++i) {
         struct sys_event *event = &events.events[i];
 
-        b32 consumed = console_process_event(*event);
+        /* Send event to console. Skip if consumed. */
-        if (consumed) {
+        if (console_process_event(*event)) {
             continue;
         }
 
@@ -226,12 +241,33 @@ INTERNAL void user_update(void)
             app_quit();
         }
 
+        /* Move camera/view */
+        if (event->button == SYS_BTN_M3) {
+            if (event->kind == SYS_EVENT_KIND_BUTTON_DOWN) {
+                L.panning = true;
+                L.panning_from = view_mouse_pos(L.world_view);
+            } else if (event->kind == SYS_EVENT_KIND_BUTTON_UP) {
+                L.panning = false;
+            }
+        }
+
+        /* Zoom camera/view */
+        if (event->kind == SYS_EVENT_KIND_BUTTON_DOWN) {
+            if (event->button == SYS_BTN_MWHEELUP) {
+                ++zooms_to_apply;
+            } else if (event->button == SYS_BTN_MWHEELDOWN) {
+                --zooms_to_apply;
+            }
+        }
+
+        if (event->kind == SYS_EVENT_KIND_BUTTON_UP) {
 #if DEVELOPER
             /* Escape quit */
-        if (event->kind == SYS_EVENT_KIND_BUTTON_UP && event->button == SYS_BTN_ESC) {
+            if (event->button == SYS_BTN_ESC) {
                 app_quit();
             }
 #endif
+        }
 
         /* Text */
         if (event->kind == SYS_EVENT_KIND_TEXT) {
@@ -247,6 +283,38 @@ INTERNAL void user_update(void)
         }
     }
 
+    /* Pan view */
+    if (L.panning) {
+        struct v2 offset = v2_sub(L.panning_from, view_mouse_pos(L.world_view));
+        L.world_view.center = v2_add(L.world_view.center, offset);
+        L.panning_from = view_mouse_pos(L.world_view);
+    }
+
+    /* Zoom view */
+    if (zooms_to_apply != 0) {
+        i32 dir = zooms_to_apply >= 0 ? 1 : -1;
+        u32 zooms_abs = zooms_to_apply >= 0 ? zooms_to_apply : -zooms_to_apply;
+
+        /* Zoom camera/view */
+        f32 zoom_rate = 2;
+        f32 new_zoom = L.world_view.zoom;
+        for (u32 i = 0; i < zooms_abs; ++i) {
+            if (dir > 0) {
+                new_zoom *= zoom_rate;
+            } else {
+                new_zoom *= 1.0f / zoom_rate;
+            }
+        }
+
+        struct v2 old_mouse = view_mouse_pos(L.world_view);
+        L.world_view.zoom = new_zoom;
+        struct v2 new_mouse = view_mouse_pos(L.world_view);
+
+        /* Offset view to zoom in on mouse */
+        struct v2 offset = v2_sub(old_mouse, new_mouse);
+        L.world_view.center = v2_add(L.world_view.center, offset);
+    }
+
     /* Pull ticks */
     struct interp_ticks interp_ticks = pull_interp_ticks();
     struct tick *t0 = interp_ticks.from_tick;
@@ -282,9 +350,10 @@ INTERNAL void user_update(void)
      * ========================== */
 
     {
-        //f32 thickness = 1.f / PIXELS_PER_UNIT;
+        f32 thickness = 3.f / PIXELS_PER_UNIT / L.world_view.zoom;
-        f32 thickness = 5.f / PIXELS_PER_UNIT;
         u32 color = RGBA(0x3f, 0x3f, 0x3f, 0xFF);
+        u32 x_color = RGBA(0x3f, 0, 0, 0xFF);
+        u32 y_color = RGBA(0, 0x3f, 0, 0xFF);
 
         i64 startx = -5;
         i64 starty = -5;
@@ -295,18 +364,24 @@ INTERNAL void user_update(void)
         /* Draw column lines */
         struct v2 col_ray = V2(0, rows);
         for (i64 col = starty; col <= (starty + cols); ++col) {
+            u32 line_color = color;
+            if (col == 0) {
+                line_color = y_color;
+            }
+
             struct v2 pos = V2(col, starty);
-            draw_solid_ray(L.world_canvas, pos, col_ray, thickness, color);
+            draw_solid_ray(L.world_canvas, pos, col_ray, thickness, line_color);
         }
 
         struct v2 row_ray = V2(cols, 0);
         for (i64 row = startx; row <= (startx + rows); ++row) {
-            struct v2 pos = V2(startx, row);
+            u32 line_color = color;
-            draw_solid_ray(L.world_canvas, pos, row_ray, thickness, color);
+            if (row == 0) {
+                line_color = x_color;
+            }
+            struct v2 pos = V2(startx, row);
+            draw_solid_ray(L.world_canvas, pos, row_ray, thickness, line_color);
         }
-
-        /* Draw center square */
-        draw_solid_rect(L.world_canvas, RECT(0, 0, 1.f / 10, 1.f / 10), RGBA_F(1, 0, 0, 0.2));
     }
 
 
@@ -358,42 +433,16 @@ INTERNAL void user_update(void)
         }
     }
 
-    /* ========================== *
-     * Testing
-     * ========================== */
-
-    /* Calculate view matrices */
-
-    /* World view testing */
-    {
-        //L.world_view.center.x += (1.0 / USER_FPS) * 3;
-        //L.world_view.center.y += (1.0 / USER_FPS) * 3;
-        //L.world_view.rot += -(1.0 / USER_FPS);
-        //L.world_view.zoom *= 1 - ((1.0 / USER_FPS) * 0.2);
-
-        /* Draw vectors */
-        f32 thickness = 2;
-        struct v2 pos = L.screen_center;
-        struct mat3x3 mtx = view_get_xform(L.world_view);
-
-
-        struct v2 right = mat3x3_right(mtx);
-        struct v2 down = mat3x3_down(mtx);
-
-        draw_solid_ray(L.ui_canvas, pos, right, thickness, COLOR_RED);
-        draw_solid_ray(L.ui_canvas, pos, down, thickness, COLOR_GREEN);
-    }
-
     /* Update listener using world view */
     mixer_set_listener(L.world_view.center, V2(-math_sin(L.world_view.rot), -math_cos(L.world_view.rot)));
 
-    /* Get world mouse pos */
+    /* Send world mouse pos */
-    struct v2 world_mouse = { 0 };
+    struct v2 world_mouse = view_mouse_pos(L.world_view);
-    {
+    queue_game_cmd(&cmd_list, (struct game_cmd) {
-        struct mat3x3 world_view_inverse = mat3x3_inverse(view_get_xform(L.world_view));
+        .kind = GAME_CMD_KIND_SET_PLAYER_FOCUS,
-        struct v3 world_mouse_v3 = mat3x3_mul_v3(world_view_inverse, V3(L.screen_mouse.x, L.screen_mouse.y, 1));
+        .state = true,
-        world_mouse = V2(world_mouse_v3.x, world_mouse_v3.y);
+        .pos = world_mouse
-    }
+    });
 
     /* Draw debug info */
     {
@@ -426,13 +475,6 @@ INTERNAL void user_update(void)
         pos.y += spacing;
     }
 
-    /* Send world mouse pos */
-    queue_game_cmd(&cmd_list, (struct game_cmd) {
-        .kind = GAME_CMD_KIND_SET_PLAYER_FOCUS,
-        .state = true,
-        .pos = world_mouse
-    });
-
     /* Push game cmds */
     push_game_cmds(&cmd_list);