ln, exp, pow, camera lerping

src/common.h

@@ -278,6 +278,10 @@ typedef u64 umm;
 #define I32_MIN ((i32)-0x80000000)
 #define I64_MIN ((i64)-0x8000000000000000LL)
 
+#define F32_INFINITY    (1.0 / 0.0f)
+#define F32_MAX         (3.402823466e+38F)
+#define F32_MIN         (1.175494351e-38F)
+
 #define PI      ((f32)3.14159265358979323846)
 #define TAU     ((f32)6.28318530717958647693)
 

src/entity.h

@@ -94,7 +94,11 @@ struct entity {
 
     /* ENTITY_PROP_CAMERA */
     struct entity_handle camera_follow;
+    struct xform camera_target_xform;  /* Calculated from camera_follow */
     f32 camera_zoom;
+    f32 camera_lerp;  /* Rate at which camera xform approaches target xform */
+    u32 camera_lerp_gen;
+    u32 camera_applied_lerp_gen_plus_one;  /* Calculated */
 };
 
 struct entity_array {

src/game.c

@@ -119,7 +119,7 @@ INTERNAL void game_update(void)
             e->sprite_tint = COLOR_WHITE;
 
             entity_enable_prop(e, ENTITY_PROP_PLAYER_CONTROLLED);
-            e->player_max_speed = 5.f;
+            e->player_max_speed = 4.f;
             e->player_acceleration = 20.0f;
             e->player_focus_dir = V2(0, -1);
 
@@ -452,18 +452,41 @@ INTERNAL void game_update(void)
          * Update camera position
          * ========================== */
 
+        /* Camera follow */
         if (entity_has_prop(ent, ENTITY_PROP_CAMERA)) {
             struct entity *follow = entity_from_handle(&L.world.entity_store, ent->camera_follow);
-            ent->world_xform = follow->world_xform;
+            ent->camera_target_xform = follow->world_xform;
-            ent->world_xform = xform_with_rotation(ent->world_xform, 0);
+            ent->camera_target_xform = xform_with_rotation(ent->camera_target_xform, 0);
-            ent->world_xform = xform_with_scale(ent->world_xform, V2(1, 1));
+            ent->camera_target_xform = xform_with_scale(ent->camera_target_xform, V2(1, 1));
 
             if (entity_has_prop(follow, ENTITY_PROP_PLAYER_CONTROLLED)) {
+#if 1
+                /* Regular style camera */
+                f32 target_dist_x = 0.5;
+                f32 target_dist_y = target_dist_x * (16.0f / 9.0f);
+                struct v2 focus_dir = follow->player_focus_dir;
+                struct v2 target_dir = v2_mul_v2(v2_norm(focus_dir), V2(target_dist_x, target_dist_y));
+                struct v2 target_pos = v2_add(ent->camera_target_xform.og, target_dir);
+                ent->camera_target_xform.og = target_pos;
+#else
+                /* "Look" style camera */
                 struct v2 focus_dir = follow->player_focus_dir;
                 struct v2 focus_half_dir = v2_mul(focus_dir, 0.5f);
                 struct v2 focus_half_pos = v2_add(follow->world_xform.og, focus_half_dir);
-                ent->world_xform.og = focus_half_pos;
+                ent->camera_target_xform.og = focus_half_pos;
+#endif
             }
+
+            /* Lerp camera */
+            if (ent->camera_applied_lerp_gen_plus_one == ent->camera_lerp_gen + 1) {
+                f32 t = 1 - math_pow(2.f, -10.f * (f32)L.world.dt);
+                ent->rel_xform = xform_lerp(ent->rel_xform, ent->camera_target_xform, t);
+            } else {
+                /* Skip lerp */
+                ent->rel_xform = ent->camera_target_xform;
+            }
+            ent->camera_applied_lerp_gen_plus_one = ent->camera_lerp_gen + 1;
+            ent->world_xform = ent->rel_xform;
         }
 
         /* ========================== *

src/math.h

@@ -3,6 +3,8 @@
 
 #include "intrinsics.h"
 
+INLINE f32 math_sqrt(f32 x);
+
 /* ========================== *
  * Rounding
  * ========================== */
@@ -37,9 +39,8 @@ INLINE f32 math_fabs(f32 f)
 
 INLINE i32 math_fsign(f32 f)
 {
-    u32 bits = *(u32 *)&f;
+    u32 sign_bit = (*(u32 *)&f >> 31) & 1;
-    i32 sign_bit = bits & ((u32)1 << 31);
+    return 1 + -(sign_bit << 1);
-    return 1 + (sign_bit * -2);
 }
 
 /* ========================== *
@@ -128,6 +129,174 @@ INLINE u64 math_pow_u64(u64 base, u8 exp) {
     }
 }
 
+/* Based on FreeBSD's implementation
+ * https://github.com/freebsd/freebsd-src/blob/main/lib/msun/src/e_logf.c */
+INLINE f32 math_ln(f32 x)
+{
+    static const f32 ln2_hi = 6.9313812256e-01;
+    static const f32 ln2_lo = 9.0580006145e-06;
+
+    i32 x_int = *(u32 *)&x;
+
+    i32 k = 0;
+    if (x_int < 0x00800000) {
+        f32 two_p25 = 3.3554432000e+07;
+        if ((x_int & 0x7fffffff) == 0) {
+            /* Return -inf if x is 0 */
+            return -two_p25 / 0;
+        } else if (x_int < 0) {
+            /* Return NaN if x is negative */
+            return (x - x) / 0;
+        }
+        k -= 25;
+        x *= two_p25;
+        x_int = *(u32 *)&x;
+    } else if (x_int >= 0x7f800000) {
+        return x + x;
+    }
+
+    k += (x_int >> 23) - 127;
+    x_int &= 0x007fffff;
+    i32 i = (x_int + (0x95f64 << 3)) & 0x800000;
+    i32 x_int_normalized = x_int | (i ^ 0x3f800000);
+    x = *(f32 *)&x_int_normalized - 1.0f;
+    k += (i >> 23);
+
+    if ((0x007fffff & (0x8000 + x_int)) < 0xc000) {
+        if (x == 0.0f) {
+            if (k == 0) {
+                return 0;
+            } else {
+                return (f32)k * ln2_hi + (f32)k * ln2_lo;
+            }
+        }
+        f32 r = x * x * (0.5f - 0.33333333333333333f * x);
+        if (k == 0) {
+            return x - r;
+        } else {
+            return (f32)k * ln2_hi - ((r - (f32)k * ln2_lo) - x);
+        }
+    }
+
+    f32 s = x / (2.0f + x);
+    f32 z = s * s;
+    f32 w = z * z;
+    f32 r = (z * (0.66666662693f + w * 0.28498786688f)) + (w * (0.40000972152f + w * 0.24279078841f));
+    if (((x_int - (0x6147a << 3)) | ((0x6b851 << 3) - x_int)) > 0) {
+        f32 hfsq = 0.5f * x * x;
+        if (k == 0) {
+            return x - (hfsq - s * (hfsq + r));
+        } else {
+            return (f32)k * ln2_hi - ((hfsq - (s * (hfsq + r) + (f32)k * ln2_lo)) - x);
+        }
+    } else {
+        if (k == 0) {
+            return x - s * (x - r);
+        } else {
+            return (f32)k * ln2_hi - ((s * (x - r) - (f32)k * ln2_lo) - x);
+        }
+    }
+}
+
+/* Based on FreeBSD's implementation
+ * https://github.com/freebsd/freebsd-src/blob/main/lib/msun/src/e_expf.c */
+INLINE f32 math_exp(f32 x)
+{
+    static const f32 half[2] = { 0.5, -0.5 };
+    static const f32 o_threshold = 8.8721679688e+01;
+    static const f32 u_threshold = -1.0397208405e+02;
+    static const f32 ln2_hi[2] = { 6.9314575195e-01, -6.9314575195e-01 };
+    static const f32 ln2_lo[2] = { 1.4286067653e-06, -1.4286067653e-06 };
+    static const f32 inv_ln2 = 1.4426950216e+00;
+    static const f32 huge = 1.0e+30;
+    static const f32 two_m100 = 7.8886090522e-31;
+
+    u32 x_uint = *(u32 *)&x;
+    i32 x_sign_bit = (x_uint >> 31) & 1;
+    x_uint &= 0x7fffffff;
+
+    /* Filter out non-finite argument */
+    if (x_uint >= 0x42b17218) { /* if |x|>=88.721... */
+        if (x_uint > 0x7f800000) {
+            return x + x;  /* NaN */
+        } else if (x_uint == 0x7f800000) {
+            return (x_sign_bit == 0) ? x : 0.0;
+        }
+        if (x > o_threshold) {
+            /* Overflow */
+            return huge * huge;
+        } else if (x < u_threshold) {
+            /* Underflow */
+            return two_m100 * two_m100;
+        }
+    }
+
+    /* Argument reduction */
+    i32 k = 0;
+    f32 hi = 0;
+    f32 lo = 0;
+    if (x_uint > 0x3eb17218) {
+        if (x_uint < 0x3F851592) {
+            hi = x - ln2_hi[x_sign_bit];
+            lo = ln2_lo[x_sign_bit];
+            k = 1 - x_sign_bit - x_sign_bit;
+        } else {
+            k = inv_ln2 * x + half[x_sign_bit];
+            hi = x - (f32)k * ln2_hi[0];
+            lo = (f32)k * ln2_lo[0];
+        }
+        x = hi - lo;
+    } else if (x_uint < 0x39000000)  {
+        if (huge + x > 1.0f) {
+            return 1.0f + x;
+        }
+    } else {
+        k = 0;
+    }
+
+    f32 two_pk;
+    if (k >= -125) {
+        u32 temp = ((u32)(0x7f + k)) << 23;
+        two_pk = *(f32 *)&temp;
+    } else {
+        u32 temp = ((u32)(0x7f + (k + 100))) << 23;
+        two_pk = *(f32 *)&temp;
+    }
+
+    f32 t = x * x;
+    f32 c  = x - t * (1.6666625440e-1f + t * -2.7667332906e-3f);
+    if (k == 0) {
+        return 1.0f - ((x * c) / (c - 2.0f) - x);
+    } else {
+        f32 y = 1.0f - ((lo - (x * c)/(2.0f - c))-hi);
+        if (k >= -125) {
+            if (k==128) {
+                u32 temp = 0x7f800000;
+                return y * 2.0f * (*(f32 *)&temp);
+            }
+            return y * two_pk;
+        } else {
+            return y * two_pk * two_m100;
+        }
+    }
+}
+
+INLINE f32 math_pow(f32 a, f32 b)
+{
+    if (a >= 0) {
+        /* a is positive */
+        return math_exp(math_ln(a) * b);
+    } else {
+        /* a is negative */
+        i32 res_sign = math_round(b) % 2 == 0 ? 1 : -1;
+        return math_exp(math_ln(-a) * b) * res_sign;
+    }
+}
+
+INLINE f32 math_sqrt(f32 x)
+{
+    return ix_sqrt_f32(x);
+}
 
 INLINE f32 math_rsqrt(f32 x)
 {
@@ -145,15 +314,10 @@ INLINE f32 math_rsqrt_fast(f32 x)
     i32 i = *(i32 *)&y;
     i = 0x5f3759df - (i >> 1);
     y = *(f32 *)&i;
-    y *= three_halfs - (x2 * y * y);  /* 1st iteration */
+    y *= three_halfs - (x2 * y * y);
     return y;
 }
 
-INLINE f32 math_sqrt(f32 x)
-{
-    return ix_sqrt_f32(x);
-}
-
 /* ========================== *
  * Trig
  * ========================== */
@@ -224,7 +388,7 @@ INLINE f32 math_acos(f32 x)
  * Lerp
  * ========================== */
 
-INLINE f32 math_lerp_f32(f32 val0, f32 val1, f32 t)
+INLINE f32 math_lerp(f32 val0, f32 val1, f32 t)
 {
     return val0 + ((val1 - val0) * t);
 }
@@ -364,8 +528,8 @@ INLINE b32 v2_eq(struct v2 a, struct v2 b)
 INLINE struct v2 v2_lerp(struct v2 val0, struct v2 val1, f32 t)
 {
     struct v2 res;
-    res.x = math_lerp_f32(val0.x, val1.x, t);
+    res.x = math_lerp(val0.x, val1.x, t);
-    res.y = math_lerp_f32(val0.y, val1.y, t);
+    res.y = math_lerp(val0.y, val1.y, t);
     return res;
 }
 
@@ -532,9 +696,9 @@ INLINE struct xform xform_scale(struct xform xf, struct v2 v)
 
 INLINE struct xform xform_with_rotation(struct xform xf, f32 r)
 {
-	struct v2 scale = xform_get_scale(xf);
+    struct v2 scale = xform_get_scale(xf);
-	f32 c = math_cos(r);
+    f32 c = math_cos(r);
-	f32 s = math_sin(r);
+    f32 s = math_sin(r);
     xf.bx = V2(c, s);
     xf.by = V2(-s, c);
     xf = xform_with_scale(xf, scale);
@@ -543,8 +707,8 @@ INLINE struct xform xform_with_rotation(struct xform xf, f32 r)
 
 INLINE struct xform xform_with_scale(struct xform xf, struct v2 s)
 {
-	xf.bx = v2_mul(v2_norm(xf.bx), s.x);
+    xf.bx = v2_mul(v2_norm(xf.bx), s.x);
-	xf.by = v2_mul(v2_norm(xf.by), s.y);
+    xf.by = v2_mul(v2_norm(xf.by), s.y);
     return xf;
 }
 
@@ -586,8 +750,8 @@ INLINE struct xform xform_lerp(struct xform a, struct xform b, f32 t)
 
 INLINE struct xform xform_invert(struct xform xf)
 {
-	f32 det = xform_get_determinant(xf);
+    f32 det = xform_get_determinant(xf);
-	f32 inv_det = 1.0f / det;
+    f32 inv_det = 1.0f / det;
 
     f32 old_bx_x = xf.bx.x;
     xf.bx.x = xf.by.y;
@@ -691,7 +855,7 @@ INLINE f32 xform_get_rotation(struct xform xf)
 INLINE struct v2 xform_get_scale(struct xform xf)
 {
     f32 det_sign = math_fsign(xform_get_determinant(xf));
-	return V2(v2_len(xf.bx), det_sign * v2_len(xf.by));
+    return V2(v2_len(xf.bx), det_sign * v2_len(xf.by));
 }
 
 /* ========================== *

src/mixer.c

@@ -370,8 +370,8 @@ struct mixed_pcm_f32 mixer_update(struct arena *arena, u64 frame_count)
 
                     /* Lerp */
                     f32 t = in_frame_pos_exact - (f32)in_frame_pos_prev;
-                    f32 sample1 = math_lerp_f32(sample1_prev, sample1_next, t);
+                    f32 sample1 = math_lerp(sample1_prev, sample1_next, t);
-                    f32 sample2 = math_lerp_f32(sample2_prev, sample2_next, t);
+                    f32 sample2 = math_lerp(sample2_prev, sample2_next, t);
 
                     out_samples[(out_frame_pos * 2) + 0] += sample1;
                     out_samples[(out_frame_pos * 2) + 1] += sample2;
@@ -389,7 +389,7 @@ struct mixed_pcm_f32 mixer_update(struct arena *arena, u64 frame_count)
 
                     /* Lerp */
                     f32 t = (f32)in_frame_pos_exact - in_frame_pos_prev;
-                    f32 sample = math_lerp_f32(sample_prev, sample_next, t);
+                    f32 sample = math_lerp(sample_prev, sample_next, t);
 
                     out_samples[(out_frame_pos * 2) + 0] += sample;
                     out_samples[(out_frame_pos * 2) + 1] += sample;
@@ -440,8 +440,8 @@ struct mixed_pcm_f32 mixer_update(struct arena *arena, u64 frame_count)
             /* Spatialize samples */
             for (u64 frame_pos = 0; frame_pos < frame_count; ++frame_pos) {
                 f32 t = (f32)frame_pos / (f32)(frame_count - 1);
-                f32 volume = math_lerp_f32(volume_start, volume_end, t);
+                f32 volume = math_lerp(volume_start, volume_end, t);
-                f32 pan = math_lerp_f32(pan_start, pan_end, t);
+                f32 pan = math_lerp(pan_start, pan_end, t);
 
                 u64 sample1_index = frame_pos * 2;
                 u64 sample2_index = sample1_index + 1;

src/sys.h

@@ -13,8 +13,8 @@ enum sys_event_kind {
 
     SYS_EVENT_KIND_BUTTON_DOWN,
     SYS_EVENT_KIND_BUTTON_UP,
+    SYS_EVENT_KIND_CURSOR_MOVE,
     SYS_EVENT_KIND_MOUSE_MOVE,
-    SYS_EVENT_KIND_RAW_MOUSE_MOVE,
     SYS_EVENT_KIND_TEXT,
     SYS_EVENT_KIND_QUIT,
 
@@ -128,15 +128,19 @@ enum sys_btn {
 struct sys_event {
     enum sys_event_kind kind;
 
+    /* SYS_EVENT_KIND_BUTTON_DOWN */
+    /* SYS_EVENT_KIND_BUTTON_UP */
     enum sys_btn button;
     b32 is_repeat;
 
+    /* SYS_EVENT_KIND_TEXT */
     u32 text_character;
 
-    struct v2 mouse_position;
+    /* SYS_EVENT_KIND_CURSOR_MOVE */
-    struct v2 mouse_delta;
+    struct v2 cursor_position;
 
-    struct v2 raw_mouse_delta;
+    /* SYS_EVENT_KIND_MOUSE_MOVE */
+    struct v2 mouse_delta;
 };
 
 struct sys_event_array {

src/sys_win32.c

@@ -59,7 +59,6 @@ struct win32_window {
      * their pre-minimized values) */
     i32 x, y, width, height;
 
-    struct v2 cursor_pos;
     u32 cursor_set_flags;
     struct v2 cursor_set_position;
 
@@ -788,7 +787,7 @@ INTERNAL void win32_update_window_from_settings(struct win32_window *window, str
 INTERNAL void win32_window_wake(struct win32_window *window)
 {
     /* Post a blank message to the window's thread message queue to wake it. */
-    PostThreadMessageA(window->tid, 0, 0, 0);
+    PostThreadMessageA(window->tid, WM_NULL, 0, 0);
 }
 
 INTERNAL LRESULT CALLBACK win32_window_proc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
@@ -915,8 +914,7 @@ INTERNAL LRESULT CALLBACK win32_window_proc(HWND hwnd, UINT msg, WPARAM wparam,
                     window,
                     (struct sys_event) {
                         .kind = event_kind,
-                        .button = button,
+                        .button = button
-                        .mouse_position = window->cursor_pos
                     }
                 );
             }
@@ -938,15 +936,11 @@ INTERNAL LRESULT CALLBACK win32_window_proc(HWND hwnd, UINT msg, WPARAM wparam,
         case WM_MOUSEMOVE: {
             i32 x = GET_X_LPARAM(lparam);
             i32 y = GET_Y_LPARAM(lparam);
-            struct v2 old = window->cursor_pos;
-            window->cursor_pos = V2(x, y);
-            struct v2 delta = v2_sub(window->cursor_pos, old);
             win32_window_process_event(
                 window,
                 (struct sys_event) {
-                    .kind = SYS_EVENT_KIND_MOUSE_MOVE,
+                    .kind = SYS_EVENT_KIND_CURSOR_MOVE,
-                    .mouse_position = window->cursor_pos,
+                    .cursor_position = V2(x, y)
-                    .mouse_delta = delta
                 }
             );
         } break;
@@ -972,8 +966,8 @@ INTERNAL LRESULT CALLBACK win32_window_proc(HWND hwnd, UINT msg, WPARAM wparam,
                 win32_window_process_event(
                     window,
                     (struct sys_event) {
-                        .kind = SYS_EVENT_KIND_RAW_MOUSE_MOVE,
+                        .kind = SYS_EVENT_KIND_MOUSE_MOVE,
-                        .raw_mouse_delta = delta
+                        .mouse_delta = delta
                     }
                 );
             }

src/ttf_dwrite.cpp

@@ -8,7 +8,6 @@ extern "C"
 #include "ttf.h"
 #include "renderer.h"
 #include "scratch.h"
-#include "math.h"
 #include "util.h"
 
 /* TODO: remove this */

src/user.c

@@ -64,9 +64,9 @@ GLOBAL struct {
     f64 dt;
     struct v2 screen_size;
     struct v2 screen_center;
-    struct v2 screen_mouse;
+    struct v2 screen_cursor;
-    struct v2 screen_mouse_delta;
+    struct v2 world_cursor;
-    struct v2 world_mouse;
+    struct v2 mouse_delta;
     struct v2 last_focus_screen_pos;
 } L = { 0 }, DEBUG_LVAR(L_user);
 
@@ -405,13 +405,14 @@ INTERNAL void user_update(void)
 
                 e->acceleration = v2_lerp(e0->acceleration, e1->acceleration, tick_blend);
                 e->velocity = v2_lerp(e0->velocity, e1->velocity, tick_blend);
-                e->player_acceleration = math_lerp_f32(e0->player_acceleration, e1->player_acceleration, tick_blend);
+                e->player_acceleration = math_lerp(e0->player_acceleration, e1->player_acceleration, tick_blend);
                 e->player_focus_dir = v2_lerp(e0->player_focus_dir, e1->player_focus_dir, tick_blend);
 
                 e->sprite_xform = xform_lerp(e0->sprite_xform, e1->sprite_xform, tick_blend);
                 e->animation_time_in_frame = math_lerp_f64(e0->animation_time_in_frame, e1->animation_time_in_frame, (f64)tick_blend);
 
-                e->camera_zoom = math_lerp_f32(e0->camera_zoom, e1->camera_zoom, tick_blend);
+                e->camera_zoom = math_lerp(e0->camera_zoom, e1->camera_zoom, tick_blend);
+                e->camera_target_xform = xform_lerp(e0->camera_target_xform, e1->camera_target_xform, tick_blend);
             }
         }
 #else
@@ -436,7 +437,7 @@ INTERNAL void user_update(void)
         };
     }
 
-    L.screen_mouse_delta = V2(0, 0);
+    L.mouse_delta = V2(0, 0);
 
     for (u64 entity_index = 0; entity_index < events.count; ++entity_index) {
         struct sys_event *event = &events.events[entity_index];
@@ -475,13 +476,13 @@ INTERNAL void user_update(void)
 #endif
 
         /* Update mouse pos */
-        if (event->kind == SYS_EVENT_KIND_MOUSE_MOVE) {
+        if (event->kind == SYS_EVENT_KIND_CURSOR_MOVE) {
-            L.screen_mouse = event->mouse_position;
+            L.screen_cursor = event->cursor_position;
         }
 
         /* Update mouse delta */
-        if (event->kind == SYS_EVENT_KIND_RAW_MOUSE_MOVE) {
+        if (event->kind == SYS_EVENT_KIND_MOUSE_MOVE) {
-            L.screen_mouse_delta = v2_add(L.screen_mouse_delta, event->raw_mouse_delta);
+            L.mouse_delta = v2_add(L.mouse_delta, event->mouse_delta);
         }
 
         /* Update bind states */
@@ -540,12 +541,12 @@ INTERNAL void user_update(void)
         /* Pan view */
         if (L.bind_states[USER_BIND_KIND_PAN].is_held) {
             if (!L.debug_camera_panning) {
-                L.debug_camera_pan_start = xform_invert_mul_v2(L.world_view, L.screen_mouse);
+                L.debug_camera_pan_start = xform_invert_mul_v2(L.world_view, L.screen_cursor);
             }
             L.debug_camera_panning = true;
-            struct v2 offset = v2_sub(L.debug_camera_pan_start, xform_invert_mul_v2(L.world_view, L.screen_mouse));
+            struct v2 offset = v2_sub(L.debug_camera_pan_start, xform_invert_mul_v2(L.world_view, L.screen_cursor));
             L.world_view = xform_translate(L.world_view, v2_neg(offset));
-            L.debug_camera_pan_start = xform_invert_mul_v2(L.world_view, L.screen_mouse);
+            L.debug_camera_pan_start = xform_invert_mul_v2(L.world_view, L.screen_cursor);
         } else {
             L.debug_camera_panning = false;
         }
@@ -567,13 +568,12 @@ INTERNAL void user_update(void)
                 }
             }
 
-            /* Zoom to mouse */
+            /* Zoom to cursor */
-            struct v2 world_mouse = xform_invert_mul_v2(L.world_view, L.screen_mouse);
+            struct v2 world_cursor = xform_invert_mul_v2(L.world_view, L.screen_cursor);
-            L.world_view = xform_translate(L.world_view, world_mouse);
+            L.world_view = xform_translate(L.world_view, world_cursor);
             L.world_view = xform_scale(L.world_view, V2(zoom, zoom));
-            L.world_view = xform_translate(L.world_view, v2_neg(world_mouse));
+            L.world_view = xform_translate(L.world_view, v2_neg(world_cursor));
         }
-
     } else {
         /* Keep cursor invisible and in screen */
         sys_window_cursor_hide(L.window);
@@ -602,6 +602,7 @@ INTERNAL void user_update(void)
         L.world_view = xform_translate(L.world_view, pivot);
         L.world_view = xform_trs_pivot_rs(L.world_view, trs, pivot);
     }
+    L.world_cursor = xform_invert_mul_v2(L.world_view, L.screen_cursor);
 
     /* ========================== *
      * Update listener
@@ -658,7 +659,7 @@ INTERNAL void user_update(void)
             .move_dir = player_move_dir
         };
         if (!L.debug_camera) {
-            struct v2 focus_move_dir = xform_basis_invert_mul_v2(L.world_view, L.screen_mouse_delta);  /* Make focus relative to world view direction */
+            struct v2 focus_move_dir = xform_basis_invert_mul_v2(L.world_view, L.mouse_delta);  /* Make focus relative to world view direction */
             focus_move_dir = v2_mul(focus_move_dir, MOUSE_SENSITIVITY);
             cmd.focus_move_dir = focus_move_dir;
         }
@@ -887,7 +888,7 @@ INTERNAL void user_update(void)
         draw_text(L.screen_canvas, font, pos, string_format(temp.arena, STR("screen_center: (%F, %F)"), FMT_FLOAT((f64)L.screen_center.x), FMT_FLOAT((f64)L.screen_center.y)));
         pos.y += spacing;
 
-        draw_text(L.screen_canvas, font, pos, string_format(temp.arena, STR("screen_mouse: (%F, %F)"), FMT_FLOAT((f64)L.screen_mouse.x), FMT_FLOAT((f64)L.screen_mouse.y)));
+        draw_text(L.screen_canvas, font, pos, string_format(temp.arena, STR("screen_cursor: (%F, %F)"), FMT_FLOAT((f64)L.screen_cursor.x), FMT_FLOAT((f64)L.screen_cursor.y)));
         pos.y += spacing;
 
         draw_text(L.screen_canvas, font, pos, string_format(temp.arena, STR("world_view.og: (%F, %F)"), FMT_FLOAT((f64)L.world_view.og.x), FMT_FLOAT((f64)L.world_view.og.y)));
@@ -899,7 +900,7 @@ INTERNAL void user_update(void)
         draw_text(L.screen_canvas, font, pos, string_format(temp.arena, STR("world_view scale: (%F, %F)"), FMT_FLOAT((f64)xform_get_scale(L.world_view).x), FMT_FLOAT((f64)xform_get_scale(L.world_view).x)));
         pos.y += spacing;
 
-        draw_text(L.screen_canvas, font, pos, string_format(temp.arena, STR("world_mouse: (%F, %F)"), FMT_FLOAT((f64)L.world_mouse.x), FMT_FLOAT((f64)L.world_mouse.y)));
+        draw_text(L.screen_canvas, font, pos, string_format(temp.arena, STR("world_cursor: (%F, %F)"), FMT_FLOAT((f64)L.world_cursor.x), FMT_FLOAT((f64)L.world_cursor.y)));
         pos.y += spacing;
 
         draw_text(L.screen_canvas, font, pos, string_format(temp.arena, STR("debug_camera: %F"), FMT_STR(L.debug_camera ? STR("true") : STR("false"))));