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wasm-test
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bouncy penger

This commit is contained in:
nemo 2024-11-13 16:46:30 +01:00
parent fea6e3879c
commit e1d3de9c05
4 changed files with 123 additions and 55 deletions
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152
app.c
View File

@ -1,28 +1,23 @@
#include "penger.c"
#define BLUE 0xffff0000
#define GREEN 0xff00ff00
#define RED 0xff0000ff
#define BLUE 0xffff0000
#define BLACK 0xff000000
#define GRAVITY 9
const unsigned int width = 800;
const unsigned int height = 600;
unsigned int BUFFER[width * height];
int scale(void);
int get_scale(void);
typedef struct v2 {
float x, y;
} v2;
#define NB 10
v2 pos[NB];
#define GRAVITY 5
#define SPEED 500
v2 dir[NB];
unsigned int radius = 30;
v2 penger_pos = {400, 300};
float random(void);
@ -31,62 +26,115 @@ int rand(int min, int max)
return min + random() * (max - min);
}
typedef enum Key {
SHIFT = 16,
SPACE = 32,
ARROW_LEFT = 37,
ARROW_RIGHT = 39,
ARROW_UP = 38,
ARROW_DOWN = 40,
KEY_COUNT,
} Key;
Key keys[KEY_COUNT] = {0};
void key_pressed(int key)
{
if (key < 0 || key >= KEY_COUNT) return;
keys[key] = 1;
}
void key_released(int key)
{
if (key < 0 || key >= KEY_COUNT) return;
keys[key] = 0;
}
v2 velocity = {0, 0};
void reset_velocity(void)
{
velocity = (v2){0, 0};
}
void rebondi(v2 *pos, int scale)
{
if (pos->x - penger_width*scale/2 < 0) {
pos->x = penger_width*scale/2;
velocity.x /= -1.5;
}
if (pos->y - penger_height*scale/2 < 0) {
pos->y = penger_height*scale/2;
velocity.y /= -1.5;
}
if (pos->x + penger_width*scale/2 >= width) {
pos->x = width - penger_width*scale/2;
velocity.x /= -1.5;
}
if (pos->y + penger_height*scale/2 >= height) {
pos->y = height - penger_height*scale/2;
velocity.y /= -1.5;
}
}
void init()
{
for (int i = 0; i < NB; i++) {
pos[i].x = rand(radius, width - radius);
pos[i].y = rand(radius, height - radius);
dir[i].x = SPEED;
dir[i].y = SPEED;
}
}
void go(float dt)
{
for (int i = 0; i < NB; i++) {
v2 npos;
npos.x = pos[i].x + dir[i].x * dt;
npos.y = pos[i].y + dir[i].y * dt;
int scale = get_scale();
if (npos.x - radius < 0 || npos.x + radius > width) {
dir[i].x = -dir[i].x;
}
if (npos.y - radius < 0 || npos.y + radius > height) {
dir[i].y = -dir[i].y;
}
pos[i].x += dir[i].x * dt;
pos[i].y += dir[i].y * dt;
if (keys[SPACE]) {
velocity.y += velocity.y < 0 ? -10 : 10;
velocity.x += rand(-10, 10);
}
for (int h = 0; h < height; h++) {
for (int w = 0; w < width; w++) {
unsigned int color = BLUE;
for (int p = 0; p < NB; p++) {
unsigned int dw = (unsigned int) pos[p].x - w;
unsigned int dh = (unsigned int) pos[p].y - h;
unsigned int d = dw * dw + dh * dh;
if (d <= radius*radius) {
unsigned short int red = (float) d/(radius*radius) * 255;
color = BLACK + red;
break;
}
}
BUFFER[h*width + w] = color;
}
if (!keys[ARROW_UP] && !keys[ARROW_DOWN]) {
velocity.y += GRAVITY * dt;
penger_pos.y += velocity.y;
}
if (!keys[ARROW_LEFT] && !keys[ARROW_RIGHT]) {
penger_pos.x += velocity.x;
}
v2 penger_origin = {(float) width/2 - 32*scale()/2, (float) height/2 - 32*scale()/2};
float speed = 10.0f;
if ((keys[ARROW_UP] || keys[ARROW_DOWN]) && (keys[ARROW_LEFT] || keys[ARROW_RIGHT]))
speed = 6.324f; // sqrt(speed) * 2 with speed = 10
if (keys[SHIFT])
speed /= 2.0f;
if (keys[ARROW_RIGHT]) {
penger_pos.x += speed;
if (velocity.x < 0) velocity.x *= -1;
}
if (keys[ARROW_LEFT]) {
penger_pos.x -= speed;
if (velocity.x > 0) velocity.x *= -1;
}
if (keys[ARROW_DOWN])
penger_pos.y += speed;
if (keys[ARROW_UP])
penger_pos.y -= speed;
for (int i = 0; i < width * height; i++)
BUFFER[i] = GREEN;
rebondi(&penger_pos, scale);
v2 penger_origin = {0};
penger_origin.x = penger_pos.x - penger_width*scale/2;
penger_origin.y = penger_pos.y - penger_height*scale/2;
for (int y = 0; y < penger_height; y++) {
for (int i = 0; i < penger_width; i++) {
if (penger_img[y][i] <= 0x00FFFFFF)
continue;
for (int s1 = 0; s1 < scale(); s1++) {
for (int s2 = 0; s2 < scale(); s2++) {
int idx_x = penger_origin.x + i*scale()+s1;
int idx_y = penger_origin.y + y*scale()+s2;
for (int s1 = 0; s1 < scale; s1++) {
for (int s2 = 0; s2 < scale; s2++) {
int idx_x = penger_origin.x + i*scale+s1;
int idx_y = penger_origin.y + y*scale+s2;
if (idx_x < 0 || idx_x >= width || idx_y < 0 || idx_y >= height)
continue;
BUFFER[idx_y*width + idx_x] = penger_img[y][i];

2
build.sh
View File

@ -1,6 +1,6 @@
#!/bin/bash
export_sym="init go BUFFER width height"
export_sym="init go key_pressed key_released reset_velocity BUFFER width height"
export_cmd=""
for e in $export_sym; do
export_cmd="$export_cmd -Wl,--export=$e";

4
index.html
View File

@ -9,5 +9,9 @@
<p id='scale'></p>
<button id='descaling'>scale - 1</button>
<button id='scaling'>scale + 1</button>
<button id='reset'>reset velocity</button>
<br>
<p>press arrow key to move</p>
<p>press space key to boost</p>
</body>
</html>

20
load.js
View File

@ -1,9 +1,12 @@
var scale = 12;
var scale = 7;
var global_instance;
window.onload = () => {
var scale_but = document.getElementById("scaling");
var descale_but = document.getElementById("descaling");
var scale_p = document.getElementById("scale");
var reset_but = document.getElementById("reset");
scale_p.innerText = "scale: " + scale;
scale_but.onclick = () => {
scale++;
@ -13,6 +16,9 @@ window.onload = () => {
scale--;
scale_p.innerText = "scale: " + scale;
}
reset_but.onclick = () => {
global_instance.exports.reset_velocity();
}
};
function make_environment(...envs) {
@ -33,10 +39,12 @@ function make_environment(...envs) {
const { instance } = await WebAssembly.instantiateStreaming(fetch("./app.wasm"), {
"env": make_environment({
'random': Math.random,
'scale': () => {return scale},
'get_scale': () => {return scale},
})
});
global_instance = instance;
const memory = new Uint32Array(instance.exports.memory.buffer);
const width = memory[instance.exports.width.value / 4];
@ -76,4 +84,12 @@ function loop(timestamp) {
}
window.requestAnimationFrame(first);
addEventListener('keydown', (e) => {
instance.exports.key_pressed(e.keyCode);
});
addEventListener('keyup', (e) => {
instance.exports.key_released(e.keyCode);
});
})()