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gradOS.c
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gradOS.c
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/*
╔════════════════════════════════════════════════════════════════════════════╗
║ ╔══════╗ . . . . ╔═╗ ╔╗ . . . . ╔═╗ ╔══════╗ ╔══════╗ ║
║ ║ ╔════╝ . . . . ║ ║ ╚╝ . . . . ╔╝ ╚╗ ║ ╔══╗ ║ ║ ╔════╝ ║
║ ║ ║╔═══╗ ╔════╗ ╔════╗ ╔══╝ ║ ╔══╗ ╔════╗ ╔════╗ ╚╗ ╔╝ ║ ║ ║ ║ ║ ╚════╗ ║
║ ║ ║╚═╗ ║ ║ ╔══╝ ╠═══ ║ ║ ╔╗ ║ ╚╗ ║ ║ ── ║ ║ ╔╗ ║ ║ ║ ║ ║ ║ ║ ╚════╗ ║ ║
║ ║ ╚══╝ ║ ║ ║ . ║ ── ║ ║ ╚╝ ║ ║ ╚╗ ║ ═══╣ ║ ║║ ║ ║ ╚═╗ ║ ╚══╝ ║ ╔════╝ ║ ║
║ ╚══════╝ ╚═╝ . ╚════╝ ╚════╝ ╚══╝ ╚════╝ ╚═╝╚═╝ ╚═══╝ ╚══════╝ ╚══════╝ ║
╚════════════════════════════════════════════════════════════════════════════╝
Ⓒ GradientOS 2024-present. All rights reserved. Hosted by Neocities.
The JS source code is located at https://gradientos.neocities.org/wasm.js
*/
#include <stdio.h>
#include <emscripten.h>
#include <string.h>
#include <math.h>
#include <stdbool.h>
#include <stdlib.h>
#include "libs/wins.h"
#define FONT_SIZ 10
#define SEL_CELLS 8
int width = 384;
int height = 216;
int scrArea;
int *screen;
int appSelH = 4 + (1 * 2) + ((FONT_SIZ + 3 * (SEL_CELLS - 1)) + FONT_SIZ); // 4 = (((border width <1>) * 2) * 2; (1 * 2) = padding on top and bottom (1px)
int appSelPos;
int appSelW;
int initCol = 0x808080;
int mouseX = 0;
int mouseY = 0;
bool isDown = false;
int activeWin = -1;
int scroll = 0; // -1 = down; 0 = not scrolling; 1 = up;
// clang-format off
EM_JS(char*, netGet, (char* url), {
// Definition in JS source
})
EM_JS(void, drawLett, (int x, int y, char ch, int hex), {
// Definition in JS source
})
EM_JS(int, getLettW, (char ch), {
// Definition in JS source
})
EM_JS(void, print, (char* txt), {
// Definition in JS source
// This function is only here for debugging purposes.
// Example: print("Hello, world!");
})
// clang-format on
void getXYFrom1D(int px, int *x, int *y) {
*x = px % width;
*y = (int)floor((double)px / width);
}
int get1DFromXY(int x, int y) {
return y * width + x;
}
void EMSCRIPTEN_KEEPALIVE setPixel(int x, int y, int hex) {
screen[get1DFromXY(x, y)] = hex;
}
void writeStr(int x, int y, char* str, int hex) {
int lettCount = x;
int count = 0;
int lettW;
char ch;
while (str[count] != *"\0") {
ch = (char)str[count];
lettW = getLettW(ch);
drawLett(lettCount, y, ch, hex);
lettCount += lettW;
lettCount += 1;
count += 1;
}
}
void fillRectOnScr(int x, int y, int w, int h, int hex) { // ...since 2024/04/15
if (x > width) return;
if (y > height) return;
// TODO: add more edge-cases here
int xCnt;
int yCnt = 0;
while (yCnt < h) {
xCnt = 0;
while (xCnt < w) {
setPixel(x + xCnt, y + yCnt, hex);
xCnt += 1;
}
yCnt += 1;
}
}
void drawLineOnScr(int x0, int y0, int x1, int y1, int hex) { // Code from Wikipedia, fixed from previous algo since 2024/04/21.
int dX, incrX, dY, incrY, err, err2;
dX = abs(x1 - x0);
incrX = x0 < x1 ? 1 : -1;
dY = 0 - abs(y1 - y0);
incrY = y0 < y1 ? 1 : -1;
err = dX + dY;
while (true) {
setPixel(x0, y0, hex);
if ((x0 == x1) && (y0 == y1)) break;
err2 = err * 2;
if (err2 >= dY) {
if (x0 == x1) break;
err = err + dY;
x0 += incrX;
}
if (err2 <= dX) {
if (y0 == y1) break;
err = err + dX;
y0 += incrY;
}
}
}
void EMSCRIPTEN_KEEPALIVE init() {
print("Screen initialized.");
scrArea = width * height;
screen = (int*)malloc(scrArea * sizeof(int));
fillRectOnScr(0, 0, width, height, initCol);
// netGet("https://google.com"); Seems like this thing works fine; will work on return checks pretty soon.
appSelPos = (height - appSelH) / 2;
appSelW = width - (appSelPos * 2);
}
int EMSCRIPTEN_KEEPALIVE render(int frm) {
int x, y;
int audio = 0;
fillRectOnScr(0, 0, width, height, initCol);
if (isDown) {audio = 1000;}
fillRectOnScr(appSelPos, appSelPos, appSelW, appSelH, 0xff00ff);
return audio;
}
void EMSCRIPTEN_KEEPALIVE freeScr() {free(screen);}
int* EMSCRIPTEN_KEEPALIVE retScr() {return screen;}
int EMSCRIPTEN_KEEPALIVE getWidth() {return width;}
int EMSCRIPTEN_KEEPALIVE getHeight() {return height;}
void EMSCRIPTEN_KEEPALIVE setMouseXY(int x, int y) {
mouseX = x;
mouseY = y;
}
void EMSCRIPTEN_KEEPALIVE setMouseDown(bool smth) {
isDown = smth;
}
void EMSCRIPTEN_KEEPALIVE setScrollMode(int m) {
if (m < 0) m = -1;
if (m > 0) m = 1;
scroll = m;
}