99 lines
3.2 KiB
C
99 lines
3.2 KiB
C
#include "../include/playerObject.h"
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void initializePlayerObject (playerObject *object) {
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// Initialize the point and velocity of a player object
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object->vel = createVelocity(0, 0);
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object->pt = createPoint(20 << FIX_SHIFT, 100 << FIX_SHIFT);
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}
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playerObject createPlayerObject (OBJ_ATTR *obj_buffer, OBJ_AFFINE *affine_buffer, int pallete_bank, int tile_id) {
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// Create a player object from data
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obj_affine_identity(affine_buffer);
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playerObject temp;
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initializePlayerObject(&temp);
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temp.rotation = 0;
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temp.obj = obj_buffer;
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temp.affine = affine_buffer;
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temp.pallete_bank = pallete_bank;
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temp.tile_id = tile_id;
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temp.isJumping = 0;
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obj_set_attr(temp.obj,
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ATTR0_SQUARE | ATTR0_AFF | ATTR0_AFF_DBL_BIT, // Set attribute 1 to be a square using affine
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ATTR1_SIZE_16 | ATTR1_AFF_ID(0), // Set size to 16 x 16
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ATTR2_PALBANK(pallete_bank) | tile_id // Which pallete to use, as we are in
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// 16-color mode
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);
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obj_set_pos(temp.obj, temp.pt.x >> FIX_SHIFT, temp.pt.y >> FIX_SHIFT);
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return temp;
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}
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void applyGravity (playerObject *object) {
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// Apply a gravity constant to a player
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object->vel.dy += float_to_fixed(GRAVITY);
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// This is a weird convention to have gravity in the positive direction,
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// but I don't want to deal with coordinate changing. Too lazy
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}
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void scalePlayer (playerObject *object, u32 scaleX, u32 scaleY) {
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// Scale the player's sprite
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// Maximum 0.5
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object->affine->pa = scaleX; object->affine->pb = 0 ;
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object->affine->pc = 0 ; object->affine->pd = scaleY;
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}
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void rotatePlayer (playerObject *object) {
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// Rotate the player's sprite
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int sinAlpha = lu_sin(object->rotation >> 4) >> 4;
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int cosAlpha = lu_cos(object->rotation >> 4) >> 4;
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object->affine->pa = cosAlpha; object->affine->pb =-sinAlpha;
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object->affine->pc = sinAlpha; object->affine->pd = cosAlpha;
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}
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u32 roundToNearest90Degrees(u32 rotation) {
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// Round a rotation to the nearest 90 degree equivalent of "binary radians"
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// (Where 2pi = 0xFFFF and 0pi = 0)
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u32 twoPi = 0xFFFF << 4;
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u32 pi = 0x8000 << 4;
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u32 halfPi = 0x4000 << 4;
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u32 quarterPi = 0x2000 << 4;
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if (rotation > quarterPi && rotation < 3 * quarterPi) {
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return halfPi;
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}
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else if (rotation > 3 * quarterPi && rotation < (pi + quarterPi)) {
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return pi;
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}
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else if (rotation > (pi + quarterPi) && rotation < (pi + 3*quarterPi)) {
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return pi + halfPi;
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}
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else if (rotation < quarterPi || rotation > (twoPi - quarterPi)) {
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return 1;
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}
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return 1;
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}
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void updatePlayer (playerObject *object, u32 GROUND_LEVEL) {
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// Update the position of a player object
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updatePoint(&object->pt, &object->vel);
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if (object->pt.y >> FIX_SHIFT >= GROUND_LEVEL) {
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// Only apply gravity if player is not touching the ground
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object->isJumping = 0;
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object->pt.y = GROUND_LEVEL << FIX_SHIFT; // Don't go through ground
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object->vel.dy = 0;
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object->rotation = roundToNearest90Degrees(object->rotation);
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}
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else {
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object->isJumping = 1;
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applyGravity(object);
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object->rotation += 100 << 8;
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}
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rotatePlayer(object);
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// Update the player object's attributes' position
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obj_set_pos(object->obj, object->pt.x >> FIX_SHIFT, object->pt.y >> FIX_SHIFT);
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// Update the player's second attribute (tile and pallete bank)
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object->obj->attr2 = ATTR2_BUILD(object->tile_id, object->pallete_bank, 0);
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}
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