first commit - a kind of working thingy
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224
src/main.c
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224
src/main.c
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#include <gb/gb.h>
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#include <stdlib.h>
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#include "../res/tiles.h"
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#include "../res/map.h"
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#include"../res/sprites.h"
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#include "./flags.h"
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#include "./constants.h"
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#include "./vec.c"
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int getTileIndexByCoord(unsigned int x, unsigned int y)
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{
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return ((y / PIXELS_PER_TILE) * 20) + (x / PIXELS_PER_TILE);
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}
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// check for external collisions (if rectangle is at least touchign something)
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unsigned int collision(unsigned char map[], struct UVec *sprite_pos, struct UVec *sprite_size)
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{
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unsigned int rv = 0;
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struct UVec itl, itr, ibl, ibr;
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itl.x = sprite_pos->x-8; itl.y = sprite_pos->y-16;
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itr.x = sprite_pos->x-1; itr.y = sprite_pos->y-16;
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ibl.x = sprite_pos->x-8; ibl.y = sprite_pos->y-9;
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ibr.x = sprite_pos->x-1; ibr.y = sprite_pos->y-9;
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// check if corners are in a non 0 tile
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if (map[getTileIndexByCoord(itl.x, itl.y-1)]) rv = rv | SC_TL;
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if (map[getTileIndexByCoord(itr.x, itr.y-1)]) rv = rv | SC_TR;
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if (map[getTileIndexByCoord(ibl.x, ibl.y+1)]) rv = rv | SC_BL;
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if (map[getTileIndexByCoord(ibr.x, ibr.y+1)]) rv = rv | SC_BR;
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if (map[getTileIndexByCoord(itl.x-1, itl.y)]) rv = rv | SC_LT;
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if (map[getTileIndexByCoord(ibl.x-1, ibl.y)]) rv = rv | SC_LB;
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if (map[getTileIndexByCoord(itr.x+1, itr.y)]) rv = rv | SC_RT;
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if (map[getTileIndexByCoord(ibr.x+1, ibr.y)]) rv = rv | SC_RB;
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return rv;
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}
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// calculate internal collisions from external collisions
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unsigned int icollision(unsigned char map[], struct UVec *sprite_pos, struct UVec *sprite_size)
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{
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unsigned int c, rv = 0;
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struct UVec itl, itr, ibl, ibr;
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itl.x = sprite_pos->x-8; itl.y = sprite_pos->y-16;
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itr.x = sprite_pos->x-1; itr.y = sprite_pos->y-16;
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ibl.x = sprite_pos->x-8; ibl.y = sprite_pos->y-9;
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ibr.x = sprite_pos->x-1; ibr.y = sprite_pos->y-9;
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if (map[getTileIndexByCoord(itl.x, itl.y)]) rv = rv | SC_ITL;
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if (map[getTileIndexByCoord(itr.x, itr.y)]) rv = rv | SC_ITR;
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if (map[getTileIndexByCoord(ibl.x, ibl.y)]) rv = rv | SC_IBL;
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if (map[getTileIndexByCoord(ibr.x, ibr.y)]) rv = rv | SC_IBR;
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return rv;
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}
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void init_gfx()
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{
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// Load Background tiles and then map
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set_bkg_data(0, 23, tiles);
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set_bkg_tiles(0, 0, mapWidth, mapHeight, map);
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set_sprite_data(0, 11, sprites);
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set_sprite_tile(0, 2);
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set_sprite_prop(0, 0);
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// Turn the background map on to make it visible
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SHOW_BKG;
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SHOW_SPRITES;
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}
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void main(void)
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{
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unsigned int c, search_found, frames_since_last_jump, frames_since_last_dash, fc = 0;
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int xsearch, ysearch;
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struct UVec sprite_pos, search_pos, sprite_size;
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struct Vec velocity, acceleration;
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init_gfx();
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sprite_pos.x = 72;
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sprite_pos.y = 35;
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sprite_size.x = 8;
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sprite_size.y = 8;
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frames_since_last_jump = JUMP_TIMEOUT_FRAMES;
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frames_since_last_dash = DASH_TIMEOUT_FRAMES;
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velocity.x = 0;
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velocity.y = 0;
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acceleration.x = 0;
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acceleration.y = 0;
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move_sprite(0, sprite_pos.x, sprite_pos.y);
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// Loop forever
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while(1) {
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// the gameboy simulates physics too quickly to have good control over the speeds of things
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// so draw them less often and move them more
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if (frames_since_last_jump <= JUMP_TIMEOUT_FRAMES) frames_since_last_jump++;
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if (frames_since_last_dash <= DASH_TIMEOUT_FRAMES) frames_since_last_dash++;
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if (++fc % 2 == 0) {
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velocity.y += GRAV_ACC;
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fc = 0;
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}
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// player move left/right
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if ((joypad() & J_RIGHT) && (velocity.x < TERM_VELX)) acceleration.x = 1;
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else if ((joypad() & J_LEFT) && (velocity.x > -TERM_VELX)) acceleration.x = -1;
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else acceleration.x = -velocity.x/abs(velocity.x);
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velocity.x += acceleration.x;
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// player dash
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if ((joypad() & J_B) && (frames_since_last_dash > DASH_TIMEOUT_FRAMES)) {
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int frames_since_last_dash_copy = frames_since_last_dash;
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frames_since_last_dash = 0;
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if ((joypad() & J_LEFT) && !(joypad() & (J_UP | J_RIGHT | J_DOWN))) {
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velocity.x = -DASH_VELL;
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} else if ((joypad() & J_RIGHT) && !(joypad() & (J_UP | J_LEFT | J_DOWN))) {
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velocity.x = DASH_VELL;
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} else if ((joypad() & J_UP) && !(joypad() & (J_RIGHT | J_LEFT | J_DOWN))) {
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velocity.y = -DASH_VELL;
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} else if ((joypad() & J_DOWN) && !(joypad() & (J_UP | J_LEFT | J_RIGHT))) {
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velocity.y = DASH_VELL;
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} else if ((joypad() & J_RIGHT) && (joypad() & J_UP)) {
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velocity.x = DASH_VELD;
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velocity.y = -DASH_VELD;
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} else if ((joypad() & J_LEFT) && (joypad() & J_UP)) {
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velocity.x = -DASH_VELD;
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velocity.y = -DASH_VELD;
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} else if ((joypad() & J_LEFT) && (joypad() & J_DOWN)) {
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velocity.x = -DASH_VELD;
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velocity.y = DASH_VELD;
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} else if ((joypad() & J_RIGHT) && (joypad() & J_DOWN)) {
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velocity.x = DASH_VELD;
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velocity.y = DASH_VELD;
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} else {
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// if player doesn't hold the right buttons to dash, don't dash and set the
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// frames_since_last_dash counter back to what it was before
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frames_since_last_dash = frames_since_last_dash_copy;
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}
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}
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// slow down sprite in kind of realistic way
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// (in real life i think it's drag is proportional to velocity square but not
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// sure if that is worth the compute yet)
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if (velocity.y > TERM_VELY) velocity.y -= (abs(velocity.y)-TERM_VELY)/TERM_VELY_DIVISOR;
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if (velocity.y < -TERM_VELY) velocity.y += (abs(velocity.y)-TERM_VELY)/TERM_VELY_DIVISOR;
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if (velocity.x > TERM_VELX) velocity.x -= (abs(velocity.x)-TERM_VELX)/TERM_VELX_DIVISOR;
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if (velocity.x < -TERM_VELX) velocity.x += (abs(velocity.x)-TERM_VELX)/TERM_VELX_DIVISOR;
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// don't let player move in a direction which they are already touching something
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if (((c & SC_TL) | (c & SC_TR)) && (velocity.y < 0)) { velocity.y = 0; }
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if (((c & SC_BL) | (c & SC_BR)) && (velocity.y > 0)) {
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// player jump
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if ((joypad() & J_A) && (frames_since_last_jump > JUMP_TIMEOUT_FRAMES)) {
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velocity.y = -JUMP_VEL;
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frames_since_last_jump = 0;
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}
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else velocity.y = 0;
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}
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if (((c & SC_RT) | (c & SC_RB)) && (velocity.x > 0)) { velocity.x = 0; }
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if (((c & SC_LT) | (c & SC_LB)) && (velocity.x < 0)) { velocity.x = 0; }
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sprite_pos.x += velocity.x;
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sprite_pos.y += velocity.y;
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c = collision(map, &sprite_pos, &sprite_size);
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// move player out of tiles by brute force searching :eyes:
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// TODO this is really stupid and bad and i think it will have to be changed when there
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// are more players moving around
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search_found = 0;
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for (ysearch = 0; ysearch <= SPRITE_HEIGHT; ysearch++) {
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for (xsearch = 0; xsearch <= SPRITE_WIDTH; xsearch++) {
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search_pos.x = sprite_pos.x + xsearch;
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search_pos.y = sprite_pos.y + ysearch;
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if(icollision(map, &search_pos, &sprite_size) == 0) {
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sprite_pos.x = search_pos.x;
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sprite_pos.y = search_pos.y;
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search_found = 1;
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break;
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}
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search_pos.x = sprite_pos.x - xsearch;
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search_pos.y = sprite_pos.y + ysearch;
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if(icollision(map, &search_pos, &sprite_size) == 0) {
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sprite_pos.x = search_pos.x;
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sprite_pos.y = search_pos.y;
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search_found = 1;
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break;
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}
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search_pos.x = sprite_pos.x - xsearch;
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search_pos.y = sprite_pos.y - ysearch;
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if(icollision(map, &search_pos, &sprite_size) == 0) {
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sprite_pos.x = search_pos.x;
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sprite_pos.y = search_pos.y;
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search_found = 1;
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break;
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}
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search_pos.x = sprite_pos.x + xsearch;
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search_pos.y = sprite_pos.y - ysearch;
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if(icollision(map, &search_pos, &sprite_size) == 0) {
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sprite_pos.x = search_pos.x;
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sprite_pos.y = search_pos.y;
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search_found = 1;
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break;
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}
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}
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if (search_found) break;
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}
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// finally move the sprite
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move_sprite(0, sprite_pos.x, sprite_pos.y);
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// Done processing, yield CPU and wait for start of next frame
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wait_vbl_done();
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}
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}
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