camera: add photo mode

meson.build

@@ -253,6 +253,7 @@ sources = [
   'src/game/phase/phase_game.c',
   'src/game/phase/phase_inventory.c',
   'src/game/phase/phase_pause.c',
+  'src/game/phase/phase_photo_mode.c',
   'src/game/phase/phase_picture.c',
   'src/game/phase/phase_stats.c',
   'src/game/random.c',

src/game/camera.c

@@ -5,13 +5,15 @@
 #include "game/items.h"
 #include "game/los.h"
 #include "game/music.h"
+#include "game/phase/phase.h"
 #include "game/random.h"
 #include "game/room.h"
 #include "game/sound.h"
 #include "game/viewport.h"
 #include "global/const.h"
 #include "global/vars.h"
 #include "math/math.h"
+#include "math/math_misc.h"
 #include "math/matrix.h"
 
 #include <libtrx/utils.h>
@@ -20,11 +22,31 @@
 #include <stdbool.h>
 #include <stddef.h>
 
+#define PHOTO_AXIS_SHIFT (STEP_L / 2)
+#define PHOTO_ROT_SHIFT (PHD_DEGREE * 3)
+#define PHOTO_CLAMP (STEP_L + 50)
+
+#define CAM_INPUT(neg, pos)                                                    \
+    ((g_Input.neg ? -1 : 0) + (g_Input.pos ? 1 : 0)) * PHOTO_AXIS_SHIFT
+
+#define SHIFT_POS(a, b)                                                        \
+    do {                                                                       \
+        a.x += b.x;                                                            \
+        a.y += b.y;                                                            \
+        a.z += b.z;                                                            \
+    } while (false)
+
 // Camera speed option ranges from 1-10, so index 0 is unused.
 static double m_ManualCameraMultiplier[11] = {
     1.0, .5, .625, .75, .875, 1.0, 1.2, 1.4, 1.6, 1.8, 2.0,
 };
 
+static bool m_PhotoMode = false;
+static CAMERA_INFO m_OldCamera = { 0 };
+
+static void M_UpdatePhotoMode(void);
+static void M_ExitPhotoMode(void);
+
 static bool M_BadPosition(int32_t x, int32_t y, int32_t z, int16_t room_num);
 static int32_t M_ShiftClamp(GAME_VECTOR *pos, int32_t clamp);
 static void M_SmartShift(
@@ -467,6 +489,7 @@ void Camera_ResetPosition(void)
 
 void Camera_Initialise(void)
 {
+    m_PhotoMode = false;
     Camera_ResetPosition();
     Camera_Update();
 }
@@ -616,8 +639,96 @@ void Camera_Fixed(void)
     }
 }
 
+static void M_UpdatePhotoMode(void)
+{
+    if (!m_PhotoMode) {
+        m_OldCamera = g_Camera;
+        m_PhotoMode = true;
+    }
+
+    PHD_ANGLE angles[2];
+    Math_GetVectorAngles(
+        g_Camera.target.x - g_Camera.pos.x, g_Camera.target.y - g_Camera.pos.y,
+        g_Camera.target.z - g_Camera.pos.z, angles);
+    g_Camera.target_angle = angles[0];
+    // [1] is x_rot
+
+    XYZ_16 shift = {
+        .x = CAM_INPUT(camera_left, camera_right),
+        .y = CAM_INPUT(photo_mode_down, photo_mode_up),
+        .z = CAM_INPUT(camera_down, camera_up),
+    };
+
+    DIRECTION direction = (uint16_t)(g_Camera.target_angle + PHD_45) / PHD_90;
+    switch (direction) {
+    case DIR_EAST: {
+        int16_t temp;
+        SWAP(shift.x, shift.z, temp);
+        shift.z *= -1;
+        break;
+    }
+    case DIR_SOUTH: {
+        shift.z *= -1;
+        shift.x *= -1;
+        break;
+    }
+    case DIR_WEST: {
+        int16_t temp;
+        SWAP(shift.x, shift.z, temp);
+        shift.x *= -1;
+        break;
+    }
+    default:
+        break;
+    }
+
+    SHIFT_POS(g_Camera.pos, shift);
+    SHIFT_POS(g_Camera.target, shift);
+
+    if (g_Input.left) {
+        g_Camera.target_angle -= PHOTO_ROT_SHIFT;
+    } else if (g_Input.right) {
+        g_Camera.target_angle += PHOTO_ROT_SHIFT;
+    }
+
+    if (g_Input.forward) {
+        g_Camera.target.y += PHOTO_AXIS_SHIFT;
+    } else if (g_Input.back) {
+        g_Camera.target.y -= PHOTO_AXIS_SHIFT;
+    }
+
+    if (g_Input.left || g_Input.right || g_Input.forward || g_Input.back) {
+        const int32_t distance =
+            g_Camera.target_distance * Math_Cos(g_Camera.target_elevation)
+            >> W2V_SHIFT;
+        g_Camera.target_square = SQUARE(distance);
+
+        const PHD_ANGLE angle = g_Camera.target_angle;
+        g_Camera.pos.x =
+            g_Camera.target.x - (distance * Math_Sin(angle) >> W2V_SHIFT);
+        g_Camera.pos.z =
+            g_Camera.target.z - (distance * Math_Cos(angle) >> W2V_SHIFT);
+    }
+
+    g_Camera.pos.y += M_ShiftClamp(&g_Camera.pos, PHOTO_CLAMP);
+    g_Camera.target.y += M_ShiftClamp(&g_Camera.target, PHOTO_CLAMP);
+}
+
+static void M_ExitPhotoMode(void)
+{
+    g_Camera = m_OldCamera;
+    m_PhotoMode = false;
+}
+
 void Camera_Update(void)
 {
+    if (Phase_Get() == PHASE_PHOTO_MODE) {
+        M_UpdatePhotoMode();
+        return;
+    } else if (m_PhotoMode) {
+        M_ExitPhotoMode();
+    }
+
     if (g_Camera.type == CAM_CINEMATIC) {
         M_LoadCutsceneFrame();
         return;

src/game/phase/phase.c

@@ -8,6 +8,7 @@
 #include "game/phase/phase_game.h"
 #include "game/phase/phase_inventory.h"
 #include "game/phase/phase_pause.h"
+#include "game/phase/phase_photo_mode.h"
 #include "game/phase/phase_picture.h"
 #include "game/phase/phase_stats.h"
 #include "global/types.h"
@@ -93,6 +94,10 @@ static void M_SetUnconditionally(const PHASE phase, void *arg)
     case PHASE_INVENTORY:
         m_Phaser = &g_InventoryPhaser;
         break;
+
+    case PHASE_PHOTO_MODE:
+        m_Phaser = &g_PhotoModePhaser;
+        break;
     }
 
     if (m_Phaser && m_Phaser->start) {

src/game/phase/phase.h

@@ -28,6 +28,7 @@ typedef enum PHASE {
     PHASE_PICTURE,
     PHASE_STATS,
     PHASE_INVENTORY,
+    PHASE_PHOTO_MODE,
 } PHASE;
 
 typedef struct PHASER {

src/game/phase/phase_game.c

@@ -106,6 +106,9 @@ static PHASE_CONTROL M_Control(int32_t nframes)
         if (!g_Lara.death_timer && g_InputDB.pause) {
             Phase_Set(PHASE_PAUSE, NULL);
             return (PHASE_CONTROL) { .end = false };
+        } else if (g_InputDB.toggle_photo_mode) {
+            Phase_Set(PHASE_PHOTO_MODE, NULL);
+            return (PHASE_CONTROL) { .end = false };
         } else {
             Item_Control();
             Effect_Control();

src/game/phase/phase_photo_mode.c

@@ -0,0 +1,77 @@
+#include "game/phase/phase_photo_mode.h"
+
+#include "game/camera.h"
+#include "game/game.h"
+#include "game/input.h"
+#include "game/interpolation.h"
+#include "game/music.h"
+#include "game/overlay.h"
+#include "game/sound.h"
+#include "game/text.h"
+#include "global/vars.h"
+
+static TEXTSTRING *m_PhotoText = NULL;
+
+static void M_Start(void *arg);
+static void M_End(void);
+static PHASE_CONTROL M_Control(int32_t nframes);
+static void M_Draw(void);
+
+static void M_Start(void *arg)
+{
+    g_OldInputDB = g_Input;
+
+    Overlay_HideGameInfo();
+    Music_Pause();
+    Sound_PauseAll();
+}
+
+static void M_End(void)
+{
+    g_Input = g_OldInputDB;
+
+    Text_Remove(m_PhotoText);
+    m_PhotoText = NULL;
+}
+
+static void M_UpdateText(void)
+{
+    if (m_PhotoText != NULL) {
+        return;
+    }
+
+    m_PhotoText = Text_Create(0, -24, "Photo Mode");
+    Text_CentreH(m_PhotoText, 1);
+    Text_AlignBottom(m_PhotoText, 1);
+}
+
+static PHASE_CONTROL M_Control(int32_t nframes)
+{
+    Input_Update();
+    Camera_Update();
+    M_UpdateText();
+
+    if (g_InputDB.toggle_photo_mode) {
+        Music_Unpause();
+        Sound_UnpauseAll();
+        Phase_Set(PHASE_GAME, NULL);
+    }
+
+    return (PHASE_CONTROL) { .end = false };
+}
+
+static void M_Draw(void)
+{
+    Interpolation_Disable();
+    Game_DrawScene(false);
+    Interpolation_Enable();
+    Text_Draw();
+}
+
+PHASER g_PhotoModePhaser = {
+    .start = M_Start,
+    .end = M_End,
+    .control = M_Control,
+    .draw = M_Draw,
+    .wait = NULL,
+};

src/game/phase/phase_photo_mode.h

@@ -0,0 +1,5 @@
+#pragma once
+
+#include "game/phase/phase.h"
+
+extern PHASER g_PhotoModePhaser;

src/global/types.h

@@ -1673,6 +1673,9 @@ typedef union INPUT_STATE {
         uint64_t toggle_bilinear_filter : 1;
         uint64_t toggle_perspective_filter : 1;
         uint64_t toggle_fps_counter : 1;
+        uint64_t toggle_photo_mode : 1;
+        uint64_t photo_mode_up : 1;
+        uint64_t photo_mode_down : 1;
         uint64_t menu_up : 1;
         uint64_t menu_down : 1;
         uint64_t menu_left : 1;

src/specific/s_input.c

@@ -981,6 +981,12 @@ INPUT_STATE S_Input_GetCurrentState(
     linput.toggle_fps_counter        = M_Key(INPUT_ROLE_FPS, layout_num);
     linput.toggle_bilinear_filter    = M_Key(INPUT_ROLE_BILINEAR, layout_num);
     linput.toggle_perspective_filter = KEY_DOWN(SDL_SCANCODE_F4);
+
+    // Temp - use roles
+    linput.toggle_photo_mode         = KEY_DOWN(SDL_SCANCODE_F1);
+    linput.photo_mode_up             = KEY_DOWN(SDL_SCANCODE_E);
+    linput.photo_mode_down           = KEY_DOWN(SDL_SCANCODE_Q);
+
     // clang-format on
 
     if (m_Controller) {