get the bird to jump!

i added deltatime so the bird should hopefully have the same speed if
the framerate drops or if you play in PAL 50hz mode.
This commit is contained in:
Fries 2024-06-21 22:57:08 -07:00
parent 3362687710
commit fc7ca18fd7
6 changed files with 56 additions and 14 deletions

Binary file not shown.

Before

Width:  |  Height:  |  Size: 6.9 KiB

After

Width:  |  Height:  |  Size: 7.3 KiB

View file

@ -20,6 +20,8 @@ const PAD_BUTTON_A = 0x0100;
const RED_COLOR = rgba(255, 0, 0, 255); const RED_COLOR = rgba(255, 0, 0, 255);
const GREEN_COLOR = rgba(0, 255, 0, 255); const GREEN_COLOR = rgba(0, 255, 0, 255);
const WHITE_COLOR = rgba(255, 255, 255, 255); const WHITE_COLOR = rgba(255, 255, 255, 255);
const FALLING_SPEED = 250;
const TERMINAL_VELOCITY_SPEED = 500;
function rgba_compare(rgba1, rgba2) { function rgba_compare(rgba1, rgba2) {
return (rgba1[0] == rgba2[0]) && return (rgba1[0] == rgba2[0]) &&
@ -28,13 +30,26 @@ function rgba_compare(rgba1, rgba2) {
(rgba1[3] == rgba2[3]); (rgba1[3] == rgba2[3]);
} }
globalThis.rectangle_color = RED_COLOR; /**
* clamps a number to the min and max values.
* @param {number} num
* @param {number} min
* @param {number} max
* @returns a clamped number
*/
function clamp(num, min, max) {
return Math.min(Math.max(num, min), max);
}
globalThis.rectangle_color = RED_COLOR;
/** @type {GRRLibTexture} */ /** @type {GRRLibTexture} */
globalThis.background = null; globalThis.background = null;
/** @type {GRRLibTexture} */ /** @type {GRRLibTexture} */
globalThis.bird = null; globalThis.bird = null;
globalThis.bird_velocity = 0;
globalThis.bird_position = 0;
function swap_colors() { function swap_colors() {
if (rgba_compare(rectangle_color, RED_COLOR)) { if (rgba_compare(rectangle_color, RED_COLOR)) {
rectangle_color = GREEN_COLOR; rectangle_color = GREEN_COLOR;
@ -51,6 +66,14 @@ function start() {
globalThis.bird = wii.grrlib.load_texture(bird); globalThis.bird = wii.grrlib.load_texture(bird);
} }
function update_bird() {
const deltatime = wii.get_deltatime();
bird_position -= bird_velocity * deltatime;
bird_velocity = clamp(bird_velocity - (FALLING_SPEED * deltatime), -TERMINAL_VELOCITY_SPEED, TERMINAL_VELOCITY_SPEED);
wii.grrlib.draw_img(0, bird_position, bird, 0, 1, 1, WHITE_COLOR);
}
function update() { function update() {
const pressed = wii.pad.buttons_down(); const pressed = wii.pad.buttons_down();
@ -60,11 +83,10 @@ function update() {
} }
if (pressed & PAD_BUTTON_A) { if (pressed & PAD_BUTTON_A) {
wii.print("a pressed"); bird_velocity = FALLING_SPEED;
swap_colors();
} }
wii.grrlib.fill_screen(WHITE_COLOR);
wii.grrlib.draw_img(0, 0, background, 0, 1, 1, WHITE_COLOR); wii.grrlib.draw_img(0, 0, background, 0, 1, 1, WHITE_COLOR);
wii.grrlib.draw_img(0, 0, bird, 0, 1, 1, WHITE_COLOR); update_bird();
wii.print("deltatime: " + wii.get_deltatime())
} }

View file

@ -2,14 +2,18 @@
#include <duktape.h> #include <duktape.h>
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <ogc/lwp_watchdog.h>
#include "data.h" #include "data.h"
#include "wii_duk.h" #include "wii_duk.h"
const float MICROSECOND = 0.000001f;
extern const char * program; extern const char * program;
static bool running = true; static bool running = true;
static GRRLIB_ttfFont * font; static GRRLIB_ttfFont * font;
static unsigned int green = RGBA(0, 255, 0, 255); static unsigned int green = RGBA(0, 255, 0, 255);
static float deltatime = 1.0f/60;
static void duk_fatal_error(void *udata, const char *msg) { static void duk_fatal_error(void *udata, const char *msg) {
const char * err_message_format = "an error has occured: %s"; const char * err_message_format = "an error has occured: %s";
@ -36,7 +40,7 @@ int main(int argc, char **argv) {
duk_context * ctx = duk_create_heap(NULL, NULL, NULL, NULL, duk_fatal_error); duk_context * ctx = duk_create_heap(NULL, NULL, NULL, NULL, duk_fatal_error);
// create a wii object on the global object (globalThis) // create a wii object on the global object (globalThis)
define_wii_object(ctx, font, &running); define_wii_object(ctx, font, &running, &deltatime);
duk_put_global_string(ctx, "wii"); duk_put_global_string(ctx, "wii");
// evaluate functions from game.js // evaluate functions from game.js
@ -48,6 +52,8 @@ int main(int argc, char **argv) {
duk_pop(ctx); duk_pop(ctx);
while (running) { while (running) {
const unsigned int beginningOfFrame = ticks_to_microsecs(gettime());
PAD_ScanPads(); PAD_ScanPads();
// call update function // call update function
@ -56,6 +62,9 @@ int main(int argc, char **argv) {
duk_pop(ctx); duk_pop(ctx);
GRRLIB_Render(); GRRLIB_Render();
const unsigned int endOfFrame = ticks_to_microsecs(gettime());
deltatime = (endOfFrame - beginningOfFrame) * MICROSECOND;
} }
duk_destroy_heap(ctx); duk_destroy_heap(ctx);

View file

@ -5,6 +5,7 @@
static GRRLIB_ttfFont * font; static GRRLIB_ttfFont * font;
static bool * running; static bool * running;
static unsigned int green = RGBA(0, 255, 0, 255); static unsigned int green = RGBA(0, 255, 0, 255);
static float * deltatime;
static duk_ret_t native_print(duk_context * ctx) { static duk_ret_t native_print(duk_context * ctx) {
GRRLIB_PrintfTTF(0, 0, font, duk_to_string(ctx, 0), 32, green); GRRLIB_PrintfTTF(0, 0, font, duk_to_string(ctx, 0), 32, green);
@ -17,7 +18,7 @@ static duk_ret_t native_exit(duk_context *ctx) {
} }
static duk_ret_t pad_buttons_down(duk_context * ctx) { static duk_ret_t pad_buttons_down(duk_context * ctx) {
u32 pressed = PAD_ButtonsDown(0); unsigned int pressed = PAD_ButtonsDown(0);
duk_push_number(ctx, pressed); duk_push_number(ctx, pressed);
return 1; return 1;
} }
@ -46,6 +47,11 @@ static duk_ret_t get_file(duk_context *ctx) {
return duk_error(ctx, DUK_ERR_ERROR, "Error trying to get the file %s.", filename); return duk_error(ctx, DUK_ERR_ERROR, "Error trying to get the file %s.", filename);
} }
static duk_ret_t get_deltatime(duk_context * ctx) {
duk_push_number(ctx, *deltatime);
return 1;
}
static void define_pad_object(duk_context *ctx) { static void define_pad_object(duk_context *ctx) {
duk_idx_t pad_obj = duk_push_object(ctx); duk_idx_t pad_obj = duk_push_object(ctx);
@ -53,9 +59,10 @@ static void define_pad_object(duk_context *ctx) {
duk_put_prop_string(ctx, pad_obj, "buttons_down"); duk_put_prop_string(ctx, pad_obj, "buttons_down");
} }
void define_wii_object(duk_context *ctx, struct GRRLIB_Font * grrlib_font, bool * global_running) { void define_wii_object(duk_context * ctx, struct GRRLIB_Font * grrlib_font, bool * global_running, float * global_deltatime) {
font = grrlib_font; font = grrlib_font;
running = global_running; running = global_running;
deltatime = global_deltatime;
duk_idx_t wii_obj = duk_push_object(ctx); duk_idx_t wii_obj = duk_push_object(ctx);
@ -73,4 +80,7 @@ void define_wii_object(duk_context *ctx, struct GRRLIB_Font * grrlib_font, bool
duk_push_c_function(ctx, get_file, 1); duk_push_c_function(ctx, get_file, 1);
duk_put_prop_string(ctx, wii_obj, "get_file"); duk_put_prop_string(ctx, wii_obj, "get_file");
duk_push_c_function(ctx, get_deltatime, 0);
duk_put_prop_string(ctx, wii_obj, "get_deltatime");
} }

View file

@ -2,5 +2,5 @@
#define WII_DUK_H #define WII_DUK_H
#include <duktape.h> #include <duktape.h>
#include <grrlib.h> #include <grrlib.h>
void define_wii_object(duk_context * ctx, struct GRRLIB_Font * grrlib_font, bool * global_running); void define_wii_object(duk_context * ctx, struct GRRLIB_Font * grrlib_font, bool * global_running, float * global_deltatime);
#endif #endif

1
types.d.ts vendored
View file

@ -5,6 +5,7 @@ declare interface GRRLibTexture {}
declare namespace wii { declare namespace wii {
function exit(): void function exit(): void
function get_file(filename: string) : FilePtr function get_file(filename: string) : FilePtr
function get_deltatime() : number
namespace grrlib { namespace grrlib {
function load_texture(file: FilePtr) : GRRLibTexture function load_texture(file: FilePtr) : GRRLibTexture
function fill_screen(color: RGBA): void function fill_screen(color: RGBA): void