Reimplement C++ into C

src/main.c

@@ -1,43 +1,69 @@
 #include "raylib.h"
 #include "raymath.h"
+#include <math.h>
+#include <stdio.h>
 
 #include "../data/cube.png.h"
 
+#if defined(PLATFORM_WEB)
+#include <emscripten/emscripten.h>
+#endif
+
 #define SCREEN_WIDTH (320)
 #define SCREEN_HEIGHT (240)
+#define WIN_WIDTH (1280)
+#define WIN_HEIGHT (720)
 
 #define MAX(a, b) ((a) > (b) ? (a) : (b))
 #define MIN(a, b) ((a) < (b) ? (a) : (b))
 
-int main(void) {
+void MainLoop();
-  SetConfigFlags(FLAG_MSAA_4X_HINT | FLAG_WINDOW_RESIZABLE |
-                 FLAG_WINDOW_MAXIMIZED | FLAG_VSYNC_HINT);
-  InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT, "game");
-  SetWindowMinSize(320, 240);
-  SetTargetFPS(60);
 
-  RenderTexture2D target = LoadRenderTexture(SCREEN_WIDTH, SCREEN_HEIGHT);
+RenderTexture2D target;
+
+Image texImg;
+Texture2D texture;
+
+Camera3D cam;
+Model cube;
+
+int main(void) {
+  SetConfigFlags(FLAG_WINDOW_RESIZABLE | FLAG_VSYNC_HINT);
+  InitWindow(WIN_WIDTH, WIN_HEIGHT, "game");
+  SetTargetFPS(60);
+  SetExitKey(KEY_BACKSPACE);
+
+  target = LoadRenderTexture(SCREEN_WIDTH, SCREEN_HEIGHT);
   SetTextureFilter(target.texture, TEXTURE_FILTER_POINT);
 
-  Image image =
+  texImg = LoadImageFromMemory(".png", cube_png, cube_png_len);
-      LoadImageFromMemory(".png", assets_cube_png, assets_cube_png_len);
+  texture = LoadTextureFromImage(texImg);
 
-  Texture2D texture = LoadTextureFromImage(image);
+  cam = (Camera3D){0};
+  cam.position = (Vector3){0.0f, 0.0f, sqrtf(3.0f)};
+  cam.target = (Vector3){0.0f, 0.0f, 0.0f};
+  cam.up = (Vector3){0.0f, 1.0f, 0.0f};
+  cam.fovy = 60.0f;
+  cam.projection = CAMERA_PERSPECTIVE;
 
-  Camera camera = {0};
+  cube = LoadModelFromMesh(GenMeshCube(1.0f, 1.0f, 1.0f));
-  camera.position = (Vector3){0.0f, 0.0f, 5.0f};
-  camera.target = (Vector3){0.0f, 0.0f, 0.0f};
-  camera.up = (Vector3){0.0f, 1.0f, 0.0f};
-  camera.fovy = 60.0f;
-  camera.projection = CAMERA_PERSPECTIVE;
-
-  Model cube = LoadModelFromMesh(GenMeshCube(1.0f, 1.0f, 1.0f));
   cube.materials[0].maps[MATERIAL_MAP_ALBEDO].texture = texture;
 
-  while (!WindowShouldClose()) {
+#if defined(PLATFORM_WEB)
+  emscripten_set_main_loop(MainLoop, 0, 1);
+#else
+  while (!WindowShouldClose())
+    MainLoop();
+#endif
+  CloseWindow();
 
-    float scale = MIN((float)GetScreenWidth() / SCREEN_WIDTH,
+  return 0;
-                      (float)GetScreenHeight() / SCREEN_HEIGHT);
+}
+
+void MainLoop() {
+  int winWidth = GetScreenWidth(), winHeight = GetScreenHeight();
+  float scale =
+      MIN((float)winWidth / SCREEN_WIDTH, (float)winHeight / SCREEN_HEIGHT);
 
   cube.transform =
       MatrixMultiply(MatrixRotateXYZ(Vector3Scale((Vector3){1.0f, 1.5f, 2.5f},
@@ -47,7 +73,8 @@ int main(void) {
   BeginTextureMode(target);
   {
     ClearBackground(BLACK);
-      BeginMode3D(camera);
+    DrawCircleV((Vector2){160.0f, 120.0f}, 120.0f, WHITE);
+    BeginMode3D(cam);
     {
       DrawModel(cube, Vector3Zero(), 1.0f, WHITE);
     }
@@ -60,18 +87,11 @@ int main(void) {
     ClearBackground(BLACK);
     DrawTexturePro(
         target.texture,
-          (Rectangle){0.0f, 0.0f, (float)target.texture.width,
+        (Rectangle){0.0f, 0.0f, (float)SCREEN_WIDTH, (float)-SCREEN_HEIGHT},
-                      (float)-target.texture.height},
+        (Rectangle){(winWidth - ((float)SCREEN_WIDTH * scale)) * 0.5f,
-          (Rectangle){
+                    (winHeight - ((float)SCREEN_HEIGHT * scale)) * 0.5f,
-              (GetScreenWidth() - ((float)SCREEN_WIDTH * scale)) * 0.5f,
-              (GetScreenHeight() - ((float)SCREEN_HEIGHT * scale)) * 0.5f,
                     (float)SCREEN_WIDTH * scale, (float)SCREEN_HEIGHT * scale},
         (Vector2){0, 0}, 0.0f, WHITE);
   }
   EndDrawing();
-  }
-
-  CloseWindow();
-
-  return 0;
 }