forked from kdx/jtmm2-old
118 lines
3.9 KiB
C
118 lines
3.9 KiB
C
#include <gint/display.h>
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#include <stdbool.h>
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#include "player.h"
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#include "vec.h"
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#include "conf.h"
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#include "camera.h"
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#include "input.h"
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#include "collide.h"
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/* TODO: Determine FRICTION and ACCELERATION from UPS. */
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#define MAX_SPD (64 * PXS)
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#define FRICTION (0.95)
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#define ACCELERATION (int)(MAX_SPD * (1 - FRICTION))
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#define GRAVITY PXS
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#define JUMP_SPD (-128 * PXS)
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#define GRACE_UNITS (int)(UPS / 5)
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#define SGN(x) ((x > 0) ? (1) : ((x < 0) ? (-1) : (0)))
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#define PLAYER_COLLIDE(pos) player_collide(player, pos, level, level->solid_layer)
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void player_move(Player *player, const Level *level) {
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/* TODO: Take into account player.origin. */
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const int sgn_spd_x = SGN(player->spd.x);
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const int sgn_spd_y = SGN(player->spd.y);
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Vec destination;
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vec_cpy(&destination, player->pos);
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/* snap the player to the grid if they hit a wall */
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destination.x += player->spd.x;
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if (PLAYER_COLLIDE(destination)) {
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destination.x = player->pos.x - player->pos.x % TILE_SIZE;
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/* Move the player tile per tile until it enters an
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* occuped tile. */
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while (!PLAYER_COLLIDE(destination)) {
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destination.x += TILE_SIZE * sgn_spd_x;
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}
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/* then, move it back one tile */
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destination.x -= TILE_SIZE * sgn_spd_x;
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player->spd.x = 0;
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}
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/* do the same for y */
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destination.y += player->spd.y;
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if (PLAYER_COLLIDE(destination)) {
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destination.y = player->pos.y - player->pos.y % TILE_SIZE;
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while (!PLAYER_COLLIDE(destination)) {
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destination.y += TILE_SIZE * sgn_spd_y;
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}
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destination.y -= TILE_SIZE * sgn_spd_y;
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if (sgn_spd_y > 0) { /* the player was falling */
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player->grace = GRACE_UNITS;
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}
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player->spd.y = 0;
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}
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/* move the player to their new position */
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vec_cpy(&player->pos, destination);
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}
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void player_step(Player *player, Input *input, const Level *level) {
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/* Get directionnal input and assign it to move.x/move.y:
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* i.e., if the player hold left and down move will have
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* move.x = -1 and move.y = 1. */
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Vec move = {
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(input_is_down(input, K_RIGHT) - input_is_down(input, K_LEFT)),
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(input_is_down(input, K_DOWN) - input_is_down(input, K_UP))
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};
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/* other keys */
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bool kp_jump = input_is_pressed(input, K_JUMP);
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int xacc = move.x * ACCELERATION; /* calculate horizontal acceleration */
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player->spd.x *= FRICTION; /* apply horizontal friction */
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player->spd.x += xacc; /* apply horizontal acceleration */
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player->spd.y += GRAVITY; /* apply gravity */
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/* Grace frames allow the player to jump a short
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* time after leaving a platform. */
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if (player->grace) {
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player->grace -= 1;
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if (kp_jump) {
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/* If the player try to jump and can, prevent
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* them to do it again and assign them the
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* corresponding y speed. */
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player->grace = 0;
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player->spd.y = JUMP_SPD;
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}
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}
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player_move(player, level); /* move the player according to their speed */
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}
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void player_draw(Player *player, Camera *camera) {
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Vec tl; /* top left */
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Vec br; /* bottom right */
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/* The rest of this function calculates the player on screen
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* position and draw it. */
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vec_cpy(&tl, player->pos);
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vec_sub(&tl, player->origin);
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vec_cpy(&br, tl);
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vec_div(&tl, VEC_PRECISION);
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vec_div(&br, VEC_PRECISION);
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vec_add(&br, player->vbox);
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vec_sub(&tl, camera->offset);
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vec_sub(&br, camera->offset);
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vec_mul(&tl, SCALE);
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vec_mul(&br, SCALE);
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vec_add(&br, (Vec){ SCALE - 1, SCALE - 1 });
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/* draw code here */
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vec_drect(tl, br, C_BLACK);
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}
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void player_draw_debug(Player *player, uint step, const Level *level, uint layer_id) {
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/* This debug function displays more or less usefull
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* informations for debugging player movement. */
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dprint(0, 0, C_BLACK, "x: %d", player->pos.x);
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dprint(0, 10, C_BLACK, "y: %d", player->pos.y);
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dprint(0, 20, C_BLACK, "vp: %d", VEC_PRECISION);
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dprint(0, 30, C_BLACK, "st: %u", step);
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dprint(0, 40, C_BLACK, "cx: %d", player->pos.x / TILE_SIZE);
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dprint(0, 50, C_BLACK, "cy: %d", player->pos.y / TILE_SIZE);
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dprint(0, 60, C_BLACK, "cl: %d", collide_point(player->pos, level, layer_id));
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}
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