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#include "types.h"
#include "point.h"
#include "velocity.h"
#include "toolbox.h"
#include "fixed.h"
#ifndef PLAYEROBJECT_H
#define PLAYEROBJECT_H
#define GRAVITY 0.75
typedef struct playerObject {
VELOCITY vel;
POINT pt;
u32 rotation; // Rotation amount
OBJ_ATTR *obj; // Attributes of the object for GBA
int pallete_bank; // Index of pallete
int tile_id; // Index of player tile
int isJumping;
} ALIGN(4) playerObject; // Word-align to ensure corruption doesn't occur
static inline void initializePlayerObject (playerObject *object) {
// Initialize the point and velocity of an object
object->vel = createVelocity(0, 0);
object->pt = createPoint(20 << FIX_SHIFT, 100 << FIX_SHIFT);
}
static inline playerObject createPlayerObject (OBJ_ATTR *obj_buffer, int pallete_bank, int tile_id) {
// Create a player object from data
playerObject temp;
initializePlayerObject(&temp);
temp.rotation = 0;
temp.obj = obj_buffer;
temp.pallete_bank = pallete_bank;
temp.tile_id = tile_id;
temp.isJumping = 0;
obj_set_attr(temp.obj,
ATTR0_SQUARE, // Set attribute 1 to be a square
ATTR1_SIZE_16, // Set size to 16 x 16
ATTR2_PALBANK(pallete_bank) | tile_id // Which pallete to use, as we are in
// 16-color mode
);
obj_set_pos(temp.obj, temp.pt.x >> FIX_SHIFT, temp.pt.y >> FIX_SHIFT);
return temp;
}
static inline void applyGravity (playerObject *object) {
// Apply a gravity constant to a player
object->vel.dy += float_to_fixed(GRAVITY);
// This is a weird convention to have gravity in the positive direction,
// but I don't want to deal with coordinate changing. Too lazy
}
static inline void updatePlayer (playerObject *object, u32 GROUND_LEVEL) {
// Update the position of a player object
updatePoint(&object->pt, &object->vel);
if (object->pt.y >> FIX_SHIFT >= GROUND_LEVEL) {
// Only apply gravity if player is not touching the ground
object->isJumping = 0;
object->pt.y = GROUND_LEVEL << FIX_SHIFT; // Don't go through ground
object->vel.dy = 0;
}
else {
object->isJumping = 1;
applyGravity(object);
}
// Update the player object's attributes' position
obj_set_pos(object->obj, object->pt.x >> FIX_SHIFT, object->pt.y >> FIX_SHIFT);
// Update the player's second attribute (tile and pallete bank)
object->obj->attr2 = ATTR2_BUILD(object->tile_id, object->pallete_bank, 0);
}
#endif // PLAYEROBJECT_H
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