Partial Libc

examples/libc/exit.c

@@ -0,0 +1,65 @@
+#include <raylib.h>
+#include <raymath.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+void raylib_js_set_entry(void (*entry)(void));
+
+const double time_per_calc = 1; // in s
+double time_since_last_calc = 0;
+char buf[BUFSIZ];
+int counter = 3;
+
+void GameFrame()
+{
+  BeginDrawing();
+
+  ClearBackground((Color){20, 20, 20, 255});
+
+  if (counter <= 0)
+  {
+    exit(0);
+  }
+
+  const size_t w = GetScreenWidth();
+  const size_t h = GetScreenHeight();
+  const size_t font_size = 72;
+
+  const int ch = h / 2 - (font_size / 2);
+
+  sprintf(buf, "%d%c", counter, '\0');
+  size_t text_size = MeasureText(buf, font_size);
+  int cw = w / 2 - (text_size / 2);
+  DrawText(buf, cw, ch, font_size, RED);
+
+  if (time_since_last_calc >= time_per_calc)
+  {
+    counter--;
+    time_since_last_calc = 0;
+  }
+  else
+  {
+    time_since_last_calc += GetFrameTime();
+  }
+
+  EndDrawing();
+}
+
+int main()
+{
+  InitWindow(800, 600, "Hello, with math.h");
+  SetTargetFPS(60);
+
+#ifdef PLATFORM_WEB
+  raylib_js_set_entry(GameFrame);
+#else
+  while (!WindowShouldClose())
+  {
+    GameFrame();
+  }
+  CloseWindow();
+#endif
+  return 0;
+}

examples/libc/file.c

@@ -0,0 +1,84 @@
+#include <raylib.h>
+#include <raymath.h>
+#include <stdio.h>
+#include <stdbool.h>
+
+void raylib_js_set_entry(void (*entry)(void));
+
+bool once = true;
+FILE *read_me = NULL;
+
+char buf[BUFSIZ];
+const double time_per_calc = 2; // in s
+double time_since_last_calc = 0;
+
+void GameFrame()
+{
+  BeginDrawing();
+
+  ClearBackground((Color){20, 20, 20, 255});
+
+  const size_t w = GetScreenWidth();
+  const size_t h = GetScreenHeight();
+  const size_t font_size = 48;
+
+  if (time_since_last_calc >= time_per_calc)
+  {
+    // Get new line
+    if (is_file_ready(read_me))
+    {
+      if (feof(read_me))
+      {
+        rewind(read_me);
+      }
+
+      fgets(buf, BUFSIZ, read_me);
+    }
+
+    time_since_last_calc = 0;
+  }
+  else
+  {
+    time_since_last_calc += GetFrameTime();
+  }
+
+  // display text somewhat sensibly
+  size_t current_font_size = font_size;
+  size_t text_size = MeasureText(buf, font_size);
+  while (text_size > w && current_font_size > font_size / 2)
+  {
+    text_size = MeasureText(buf, --current_font_size);
+  }
+  if (text_size <= w)
+  {
+    DrawText(buf, w / 2 - (text_size / 2), h / 2 - (current_font_size / 2), current_font_size, RED);
+  }
+  else
+  {
+    DrawText(buf, 10, h / 2 - (current_font_size / 2), current_font_size, RED);
+  }
+
+  EndDrawing();
+}
+
+int main()
+{
+  InitWindow(800, 600, "Hello, with loaded README.md");
+  SetTargetFPS(60);
+
+  read_me = fopen("README.md", "rb");
+
+  int w = GetScreenWidth();
+  int h = GetScreenHeight();
+
+#ifdef PLATFORM_WEB
+  raylib_js_set_entry(GameFrame);
+#else
+  while (!WindowShouldClose())
+  {
+    GameFrame();
+  }
+  CloseWindow();
+#endif
+  return 0;
+}

examples/libc/malloc.c

@@ -0,0 +1,79 @@
+#include <raylib.h>
+#include <raymath.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+#include <string.h>
+
+void raylib_js_set_entry(void (*entry)(void));
+
+const double time_per_calc = 1; // in s
+double time_since_last_calc = 0;
+
+char buf[128];
+
+char *buf_dym = NULL;
+int counter = 1;
+
+void GameFrame()
+{
+  BeginDrawing();
+
+  ClearBackground((Color){20, 20, 20, 255});
+
+  const size_t w = GetScreenWidth();
+  const size_t h = GetScreenHeight();
+  const size_t font_size = 72;
+
+  const int ch = h / 2 - (font_size / 2);
+
+  buf_dym = realloc(buf_dym, counter + 1);
+
+  memset(buf_dym, 'a', counter);
+  buf_dym[counter] = '\0';
+  size_t text_size = MeasureText(buf_dym, font_size);
+  int cw = w / 2 - (text_size / 2);
+  DrawText(buf_dym, cw, ch - font_size, font_size, RED);
+
+  sprintf(buf, "malloc size: %d%c", counter + 1, '\0');
+  size_t m_text_size = MeasureText(buf, font_size);
+  cw = w / 2 - (m_text_size / 2);
+  DrawText(buf, cw, ch + font_size, font_size, RED);
+
+  if (text_size > w)
+  {
+    counter = 1;
+    free(buf_dym);
+    buf_dym = NULL;
+  }
+
+  if (time_since_last_calc >= time_per_calc)
+  {
+    counter++;
+    time_since_last_calc = 0;
+  }
+  else
+  {
+    time_since_last_calc += GetFrameTime();
+  }
+
+  EndDrawing();
+}
+
+int main()
+{
+  InitWindow(800, 600, "Hello, with malloc");
+  SetTargetFPS(60);
+
+#ifdef PLATFORM_WEB
+  raylib_js_set_entry(GameFrame);
+#else
+  while (!WindowShouldClose())
+  {
+    GameFrame();
+  }
+  CloseWindow();
+#endif
+  return 0;
+}

examples/libc/math.c

@@ -0,0 +1,69 @@
+#include <raylib.h>
+#include <raymath.h>
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdbool.h>
+
+void raylib_js_set_entry(void (*entry)(void));
+
+const double time_per_calc = 2; // in s
+double time_since_last_calc = 0;
+char buf[BUFSIZ];
+double random = 0;
+void GameFrame()
+{
+  BeginDrawing();
+
+  ClearBackground((Color){20, 20, 20, 255});
+
+  const size_t w = GetScreenWidth();
+  const size_t h = GetScreenHeight();
+  const size_t font_size = 48;
+
+  const int ch = h / 2 - (font_size / 2);
+
+  sprintf(buf, "cos(%.2g) = %.2g%c", random, cos(random), '\0');
+  size_t text_size = MeasureText(buf, font_size);
+  int cw = w / 2 - (text_size / 2);
+  DrawText(buf, cw, ch - font_size, font_size, RED);
+
+  sprintf(buf, "sin(%.2g) = %.2g%c", random, sin(random), '\0');
+  text_size = MeasureText(buf, font_size);
+  cw = w / 2 - (text_size / 2);
+  DrawText(buf, cw, ch + font_size, font_size, RED);
+
+  if (time_since_last_calc >= time_per_calc)
+  {
+    const int random_int = rand();
+    random = ((random_int / (double)RAND_MAX) - 0.5) * 2 * 4;
+
+    time_since_last_calc = 0;
+  }
+  else
+  {
+    time_since_last_calc += GetFrameTime();
+  }
+
+  EndDrawing();
+}
+
+int main()
+{
+  InitWindow(800, 600, "Hello, with math.h");
+  SetTargetFPS(60);
+
+  int w = GetScreenWidth();
+  int h = GetScreenHeight();
+
+#ifdef PLATFORM_WEB
+  raylib_js_set_entry(GameFrame);
+#else
+  while (!WindowShouldClose())
+  {
+    GameFrame();
+  }
+  CloseWindow();
+#endif
+  return 0;
+}

examples/libc/time.c

@@ -0,0 +1,51 @@
+#include <raylib.h>
+#include <raymath.h>
+#include <stdio.h>
+#include <stdbool.h>
+#include <time.h>
+
+void raylib_js_set_entry(void (*entry)(void));
+
+char buf[BUFSIZ];
+
+void GameFrame()
+{
+  BeginDrawing();
+
+  ClearBackground((Color){20, 20, 20, 255});
+
+  const size_t w = GetScreenWidth();
+  const size_t h = GetScreenHeight();
+  const size_t font_size = 48;
+
+  const int ch = h / 2 - (font_size / 2);
+
+  time_t t = time(NULL);
+  struct tm *ts = localtime(&t);
+
+  char *time_text = asctime(ts);
+  sprintf(buf, "%s%c", time_text, '\0');
+
+  size_t text_size = MeasureText(buf, font_size);
+  int cw = w / 2 - (text_size / 2);
+  DrawText(buf, cw, ch, font_size, RED);
+
+  EndDrawing();
+}
+
+int main()
+{
+  InitWindow(800, 600, "Hello, with math.h");
+  SetTargetFPS(60);
+
+#ifdef PLATFORM_WEB
+  raylib_js_set_entry(GameFrame);
+#else
+  while (!WindowShouldClose())
+  {
+    GameFrame();
+  }
+  CloseWindow();
+#endif
+  return 0;
+}