tumbledemerald-legacy/src/field_camera.c
2022-05-19 17:14:13 +00:00

510 lines
15 KiB
C

#include "global.h"
#include "berry.h"
#include "bike.h"
#include "field_camera.h"
#include "field_player_avatar.h"
#include "fieldmap.h"
#include "event_object_movement.h"
#include "gpu_regs.h"
#include "menu.h"
#include "overworld.h"
#include "rotating_gate.h"
#include "sprite.h"
#include "text.h"
EWRAM_DATA bool8 gUnusedBikeCameraAheadPanback = FALSE;
// Static type declarations
struct FieldCameraOffset
{
u8 xPixelOffset;
u8 yPixelOffset;
u8 xTileOffset;
u8 yTileOffset;
bool8 copyBGToVRAM;
};
// static functions
static void RedrawMapSliceNorth(struct FieldCameraOffset *cameraOffset, const struct MapLayout *mapLayout);
static void RedrawMapSliceSouth(struct FieldCameraOffset *cameraOffset, const struct MapLayout *mapLayout);
static void RedrawMapSliceEast(struct FieldCameraOffset *cameraOffset, const struct MapLayout *mapLayout);
static void RedrawMapSliceWest(struct FieldCameraOffset *cameraOffset, const struct MapLayout *mapLayout);
static s32 MapPosToBgTilemapOffset(struct FieldCameraOffset *a, s32 x, s32 y);
static void DrawWholeMapViewInternal(int x, int y, const struct MapLayout *mapLayout);
static void DrawMetatileAt(const struct MapLayout *mapLayout, u16, int, int);
static void DrawMetatile(s32 a, u16 *b, u16 c);
static void CameraPanningCB_PanAhead(void);
// IWRAM bss vars
static struct FieldCameraOffset sFieldCameraOffset;
static s16 sHorizontalCameraPan;
static s16 sVerticalCameraPan;
static bool8 sBikeCameraPanFlag;
static void (*sFieldCameraPanningCallback)(void);
struct CameraObject gFieldCamera;
u16 gTotalCameraPixelOffsetY;
u16 gTotalCameraPixelOffsetX;
// text
static void ResetCameraOffset(struct FieldCameraOffset *cameraOffset)
{
cameraOffset->xTileOffset = 0;
cameraOffset->yTileOffset = 0;
cameraOffset->xPixelOffset = 0;
cameraOffset->yPixelOffset = 0;
cameraOffset->copyBGToVRAM = TRUE;
}
static void AddCameraTileOffset(struct FieldCameraOffset *cameraOffset, u32 xOffset, u32 yOffset)
{
cameraOffset->xTileOffset += xOffset;
cameraOffset->xTileOffset %= 32;
cameraOffset->yTileOffset += yOffset;
cameraOffset->yTileOffset %= 32;
}
static void AddCameraPixelOffset(struct FieldCameraOffset *cameraOffset, u32 xOffset, u32 yOffset)
{
cameraOffset->xPixelOffset += xOffset;
cameraOffset->yPixelOffset += yOffset;
}
void ResetFieldCamera(void)
{
ResetCameraOffset(&sFieldCameraOffset);
}
void FieldUpdateBgTilemapScroll(void)
{
u32 r4, r5;
r5 = sFieldCameraOffset.xPixelOffset + sHorizontalCameraPan;
r4 = sVerticalCameraPan + sFieldCameraOffset.yPixelOffset + 8;
SetGpuReg(REG_OFFSET_BG1HOFS, r5);
SetGpuReg(REG_OFFSET_BG1VOFS, r4);
SetGpuReg(REG_OFFSET_BG2HOFS, r5);
SetGpuReg(REG_OFFSET_BG2VOFS, r4);
SetGpuReg(REG_OFFSET_BG3HOFS, r5);
SetGpuReg(REG_OFFSET_BG3VOFS, r4);
}
void GetCameraOffsetWithPan(s16 *x, s16 *y)
{
*x = sFieldCameraOffset.xPixelOffset + sHorizontalCameraPan;
*y = sFieldCameraOffset.yPixelOffset + sVerticalCameraPan + 8;
}
void DrawWholeMapView(void)
{
DrawWholeMapViewInternal(gSaveBlock1Ptr->pos.x, gSaveBlock1Ptr->pos.y, gMapHeader.mapLayout);
sFieldCameraOffset.copyBGToVRAM = TRUE;
}
static void DrawWholeMapViewInternal(int x, int y, const struct MapLayout *mapLayout)
{
u8 i;
u8 j;
u32 r6;
u8 temp;
for (i = 0; i < 32; i += 2)
{
temp = sFieldCameraOffset.yTileOffset + i;
if (temp >= 32)
temp -= 32;
r6 = temp * 32;
for (j = 0; j < 32; j += 2)
{
temp = sFieldCameraOffset.xTileOffset + j;
if (temp >= 32)
temp -= 32;
DrawMetatileAt(mapLayout, r6 + temp, x + j / 2, y + i / 2);
}
}
}
static void RedrawMapSlicesForCameraUpdate(struct FieldCameraOffset *cameraOffset, int x, int y)
{
const struct MapLayout *mapLayout = gMapHeader.mapLayout;
if (x > 0)
RedrawMapSliceWest(cameraOffset, mapLayout);
if (x < 0)
RedrawMapSliceEast(cameraOffset, mapLayout);
if (y > 0)
RedrawMapSliceNorth(cameraOffset, mapLayout);
if (y < 0)
RedrawMapSliceSouth(cameraOffset, mapLayout);
cameraOffset->copyBGToVRAM = TRUE;
}
static void RedrawMapSliceNorth(struct FieldCameraOffset *cameraOffset, const struct MapLayout *mapLayout)
{
u8 i;
u8 temp;
u32 r7;
temp = cameraOffset->yTileOffset + 28;
if (temp >= 32)
temp -= 32;
r7 = temp * 32;
for (i = 0; i < 32; i += 2)
{
temp = cameraOffset->xTileOffset + i;
if (temp >= 32)
temp -= 32;
DrawMetatileAt(mapLayout, r7 + temp, gSaveBlock1Ptr->pos.x + i / 2, gSaveBlock1Ptr->pos.y + 14);
}
}
static void RedrawMapSliceSouth(struct FieldCameraOffset *cameraOffset, const struct MapLayout *mapLayout)
{
u8 i;
u8 temp;
u32 r7 = cameraOffset->yTileOffset * 32;
for (i = 0; i < 32; i += 2)
{
temp = cameraOffset->xTileOffset + i;
if (temp >= 32)
temp -= 32;
DrawMetatileAt(mapLayout, r7 + temp, gSaveBlock1Ptr->pos.x + i / 2, gSaveBlock1Ptr->pos.y);
}
}
static void RedrawMapSliceEast(struct FieldCameraOffset *cameraOffset, const struct MapLayout *mapLayout)
{
u8 i;
u8 temp;
u32 r6 = cameraOffset->xTileOffset;
for (i = 0; i < 32; i += 2)
{
temp = cameraOffset->yTileOffset + i;
if (temp >= 32)
temp -= 32;
DrawMetatileAt(mapLayout, temp * 32 + r6, gSaveBlock1Ptr->pos.x, gSaveBlock1Ptr->pos.y + i / 2);
}
}
static void RedrawMapSliceWest(struct FieldCameraOffset *cameraOffset, const struct MapLayout *mapLayout)
{
u8 i;
u8 temp;
u8 r5 = cameraOffset->xTileOffset + 28;
if (r5 >= 32)
r5 -= 32;
for (i = 0; i < 32; i += 2)
{
temp = cameraOffset->yTileOffset + i;
if (temp >= 32)
temp -= 32;
DrawMetatileAt(mapLayout, temp * 32 + r5, gSaveBlock1Ptr->pos.x + 14, gSaveBlock1Ptr->pos.y + i / 2);
}
}
void CurrentMapDrawMetatileAt(int x, int y)
{
int offset = MapPosToBgTilemapOffset(&sFieldCameraOffset, x, y);
if (offset >= 0)
{
DrawMetatileAt(gMapHeader.mapLayout, offset, x, y);
sFieldCameraOffset.copyBGToVRAM = TRUE;
}
}
void DrawDoorMetatileAt(int x, int y, u16 *arr)
{
int offset = MapPosToBgTilemapOffset(&sFieldCameraOffset, x, y);
if (offset >= 0)
{
DrawMetatile(1, arr, offset);
sFieldCameraOffset.copyBGToVRAM = TRUE;
}
}
static void DrawMetatileAt(const struct MapLayout *mapLayout, u16 offset, int x, int y)
{
u16 metatileId = MapGridGetMetatileIdAt(x, y);
u16 *metatiles;
if (metatileId > NUM_METATILES_TOTAL)
metatileId = 0;
if (metatileId < NUM_METATILES_IN_PRIMARY)
metatiles = mapLayout->primaryTileset->metatiles;
else
{
metatiles = mapLayout->secondaryTileset->metatiles;
metatileId -= NUM_METATILES_IN_PRIMARY;
}
DrawMetatile(MapGridGetMetatileLayerTypeAt(x, y), metatiles + metatileId * 8, offset);
}
static void DrawMetatile(s32 metatileLayerType, u16 *metatiles, u16 offset)
{
switch (metatileLayerType)
{
case 2: // LAYER_TYPE_
// Draw metatile's bottom layer to the bottom background layer.
gBGTilemapBuffers3[offset] = metatiles[0];
gBGTilemapBuffers3[offset + 1] = metatiles[1];
gBGTilemapBuffers3[offset + 0x20] = metatiles[2];
gBGTilemapBuffers3[offset + 0x21] = metatiles[3];
// Draw transparent tiles to the middle background layer.
gBGTilemapBuffers1[offset] = 0;
gBGTilemapBuffers1[offset + 1] = 0;
gBGTilemapBuffers1[offset + 0x20] = 0;
gBGTilemapBuffers1[offset + 0x21] = 0;
// Draw metatile's top layer to the top background layer.
gBGTilemapBuffers2[offset] = metatiles[4];
gBGTilemapBuffers2[offset + 1] = metatiles[5];
gBGTilemapBuffers2[offset + 0x20] = metatiles[6];
gBGTilemapBuffers2[offset + 0x21] = metatiles[7];
break;
case 1: // LAYER_TYPE_COVERED_BY_OBJECTS
// Draw metatile's bottom layer to the bottom background layer.
gBGTilemapBuffers3[offset] = metatiles[0];
gBGTilemapBuffers3[offset + 1] = metatiles[1];
gBGTilemapBuffers3[offset + 0x20] = metatiles[2];
gBGTilemapBuffers3[offset + 0x21] = metatiles[3];
// Draw metatile's top layer to the middle background layer.
gBGTilemapBuffers1[offset] = metatiles[4];
gBGTilemapBuffers1[offset + 1] = metatiles[5];
gBGTilemapBuffers1[offset + 0x20] = metatiles[6];
gBGTilemapBuffers1[offset + 0x21] = metatiles[7];
// Draw transparent tiles to the top background layer.
gBGTilemapBuffers2[offset] = 0;
gBGTilemapBuffers2[offset + 1] = 0;
gBGTilemapBuffers2[offset + 0x20] = 0;
gBGTilemapBuffers2[offset + 0x21] = 0;
break;
case 0: // LAYER_TYPE_NORMAL
// Draw garbage to the bottom background layer.
gBGTilemapBuffers3[offset] = 0x3014;
gBGTilemapBuffers3[offset + 1] = 0x3014;
gBGTilemapBuffers3[offset + 0x20] = 0x3014;
gBGTilemapBuffers3[offset + 0x21] = 0x3014;
// Draw metatile's bottom layer to the middle background layer.
gBGTilemapBuffers1[offset] = metatiles[0];
gBGTilemapBuffers1[offset + 1] = metatiles[1];
gBGTilemapBuffers1[offset + 0x20] = metatiles[2];
gBGTilemapBuffers1[offset + 0x21] = metatiles[3];
// Draw metatile's top layer to the top background layer, which covers object event sprites.
gBGTilemapBuffers2[offset] = metatiles[4];
gBGTilemapBuffers2[offset + 1] = metatiles[5];
gBGTilemapBuffers2[offset + 0x20] = metatiles[6];
gBGTilemapBuffers2[offset + 0x21] = metatiles[7];
break;
}
ScheduleBgCopyTilemapToVram(1);
ScheduleBgCopyTilemapToVram(2);
ScheduleBgCopyTilemapToVram(3);
}
static s32 MapPosToBgTilemapOffset(struct FieldCameraOffset *cameraOffset, s32 x, s32 y)
{
x -= gSaveBlock1Ptr->pos.x;
x *= 2;
if (x >= 32 || x < 0)
return -1;
x = x + cameraOffset->xTileOffset;
if (x >= 32)
x -= 32;
y = (y - gSaveBlock1Ptr->pos.y) * 2;
if (y >= 32 || y < 0)
return -1;
y = y + cameraOffset->yTileOffset;
if (y >= 32)
y -= 32;
return y * 32 + x;
}
static void CameraUpdateCallback(struct CameraObject *fieldCamera)
{
if (fieldCamera->spriteId != 0)
{
fieldCamera->movementSpeedX = gSprites[fieldCamera->spriteId].data[2];
fieldCamera->movementSpeedY = gSprites[fieldCamera->spriteId].data[3];
}
}
void ResetCameraUpdateInfo(void)
{
gFieldCamera.movementSpeedX = 0;
gFieldCamera.movementSpeedY = 0;
gFieldCamera.x = 0;
gFieldCamera.y = 0;
gFieldCamera.spriteId = 0;
gFieldCamera.callback = NULL;
}
u32 InitCameraUpdateCallback(u8 trackedSpriteId)
{
if (gFieldCamera.spriteId != 0)
DestroySprite(&gSprites[gFieldCamera.spriteId]);
gFieldCamera.spriteId = AddCameraObject(trackedSpriteId);
gFieldCamera.callback = CameraUpdateCallback;
return 0;
}
void CameraUpdate(void)
{
int deltaX;
int deltaY;
int curMovementOffsetY;
int curMovementOffsetX;
int movementSpeedX;
int movementSpeedY;
if (gFieldCamera.callback != NULL)
gFieldCamera.callback(&gFieldCamera);
movementSpeedX = gFieldCamera.movementSpeedX;
movementSpeedY = gFieldCamera.movementSpeedY;
deltaX = 0;
deltaY = 0;
curMovementOffsetX = gFieldCamera.x;
curMovementOffsetY = gFieldCamera.y;
if (curMovementOffsetX == 0 && movementSpeedX != 0)
{
if (movementSpeedX > 0)
deltaX = 1;
else
deltaX = -1;
}
if (curMovementOffsetY == 0 && movementSpeedY != 0)
{
if (movementSpeedY > 0)
deltaY = 1;
else
deltaY = -1;
}
if (curMovementOffsetX != 0 && curMovementOffsetX == -movementSpeedX)
{
if (movementSpeedX > 0)
deltaX = 1;
else
deltaX = -1;
}
if (curMovementOffsetY != 0 && curMovementOffsetY == -movementSpeedY)
{
if (movementSpeedY > 0)
deltaX = 1;
else
deltaX = -1;
}
gFieldCamera.x += movementSpeedX;
gFieldCamera.x = gFieldCamera.x - 16 * (gFieldCamera.x / 16);
gFieldCamera.y += movementSpeedY;
gFieldCamera.y = gFieldCamera.y - 16 * (gFieldCamera.y / 16);
if (deltaX != 0 || deltaY != 0)
{
CameraMove(deltaX, deltaY);
UpdateObjectEventsForCameraUpdate(deltaX, deltaY);
RotatingGatePuzzleCameraUpdate(deltaX, deltaY);
SetBerryTreesSeen();
AddCameraTileOffset(&sFieldCameraOffset, deltaX * 2, deltaY * 2);
RedrawMapSlicesForCameraUpdate(&sFieldCameraOffset, deltaX * 2, deltaY * 2);
}
AddCameraPixelOffset(&sFieldCameraOffset, movementSpeedX, movementSpeedY);
gTotalCameraPixelOffsetX -= movementSpeedX;
gTotalCameraPixelOffsetY -= movementSpeedY;
}
void MoveCameraAndRedrawMap(int deltaX, int deltaY) //unused
{
CameraMove(deltaX, deltaY);
UpdateObjectEventsForCameraUpdate(deltaX, deltaY);
DrawWholeMapView();
gTotalCameraPixelOffsetX -= deltaX * 16;
gTotalCameraPixelOffsetY -= deltaY * 16;
}
void SetCameraPanningCallback(void (*callback)(void))
{
sFieldCameraPanningCallback = callback;
}
void SetCameraPanning(s16 a, s16 b)
{
sHorizontalCameraPan = a;
sVerticalCameraPan = b + 32;
}
void InstallCameraPanAheadCallback(void)
{
sFieldCameraPanningCallback = CameraPanningCB_PanAhead;
sBikeCameraPanFlag = FALSE;
sHorizontalCameraPan = 0;
sVerticalCameraPan = 32;
}
void UpdateCameraPanning(void)
{
if (sFieldCameraPanningCallback != NULL)
sFieldCameraPanningCallback();
//Update sprite offset of overworld objects
gSpriteCoordOffsetX = gTotalCameraPixelOffsetX - sHorizontalCameraPan;
gSpriteCoordOffsetY = gTotalCameraPixelOffsetY - sVerticalCameraPan - 8;
}
static void CameraPanningCB_PanAhead(void)
{
u8 var;
if (gUnusedBikeCameraAheadPanback == FALSE)
{
InstallCameraPanAheadCallback();
}
else
{
// this code is never reached
if (gPlayerAvatar.tileTransitionState == T_TILE_TRANSITION)
{
sBikeCameraPanFlag ^= 1;
if (sBikeCameraPanFlag == FALSE)
return;
}
else
{
sBikeCameraPanFlag = FALSE;
}
var = GetPlayerMovementDirection();
if (var == 2)
{
if (sVerticalCameraPan > -8)
sVerticalCameraPan -= 2;
}
else if (var == 1)
{
if (sVerticalCameraPan < 72)
sVerticalCameraPan += 2;
}
else if (sVerticalCameraPan < 32)
{
sVerticalCameraPan += 2;
}
else if (sVerticalCameraPan > 32)
{
sVerticalCameraPan -= 2;
}
}
}