convert submodules to normal folders for now

raylib/examples/models/models_billboard.c

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+/*******************************************************************************************
+*
+*   raylib [models] example - Drawing billboards
+*
+*   Example originally created with raylib 1.3, last time updated with raylib 3.5
+*
+*   Example licensed under an unmodified zlib/libpng license, which is an OSI-certified,
+*   BSD-like license that allows static linking with closed source software
+*
+*   Copyright (c) 2015-2024 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+#include "raymath.h"
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    InitWindow(screenWidth, screenHeight, "raylib [models] example - drawing billboards");
+
+    // Define the camera to look into our 3d world
+    Camera camera = { 0 };
+    camera.position = (Vector3){ 5.0f, 4.0f, 5.0f };    // Camera position
+    camera.target = (Vector3){ 0.0f, 2.0f, 0.0f };      // Camera looking at point
+    camera.up = (Vector3){ 0.0f, 1.0f, 0.0f };          // Camera up vector (rotation towards target)
+    camera.fovy = 45.0f;                                // Camera field-of-view Y
+    camera.projection = CAMERA_PERSPECTIVE;             // Camera projection type
+
+    Texture2D bill = LoadTexture("resources/billboard.png");    // Our billboard texture
+    Vector3 billPositionStatic = { 0.0f, 2.0f, 0.0f };          // Position of static billboard
+    Vector3 billPositionRotating = { 1.0f, 2.0f, 1.0f };        // Position of rotating billboard
+
+    // Entire billboard texture, source is used to take a segment from a larger texture.
+    Rectangle source = { 0.0f, 0.0f, (float)bill.width, (float)bill.height };
+
+    // NOTE: Billboard locked on axis-Y
+    Vector3 billUp = { 0.0f, 1.0f, 0.0f };
+
+    // Set the height of the rotating billboard to 1.0 with the aspect ratio fixed
+    Vector2 size = { source.width/source.height, 1.0f };
+
+    // Rotate around origin
+    // Here we choose to rotate around the image center
+    Vector2 origin = Vector2Scale(size, 0.5f);
+
+    // Distance is needed for the correct billboard draw order
+    // Larger distance (further away from the camera) should be drawn prior to smaller distance.
+    float distanceStatic;
+    float distanceRotating;
+    float rotation = 0.0f;
+
+    SetTargetFPS(60);                   // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!WindowShouldClose())        // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        UpdateCamera(&camera, CAMERA_ORBITAL);
+
+        rotation += 0.4f;
+        distanceStatic = Vector3Distance(camera.position, billPositionStatic);
+        distanceRotating = Vector3Distance(camera.position, billPositionRotating);
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            BeginMode3D(camera);
+
+                DrawGrid(10, 1.0f);        // Draw a grid
+
+                // Draw order matters!
+                if (distanceStatic > distanceRotating) 
+                {
+                    DrawBillboard(camera, bill, billPositionStatic, 2.0f, WHITE);
+                    DrawBillboardPro(camera, bill, source, billPositionRotating, billUp, size, origin, rotation, WHITE);
+                } 
+                else
+                {
+                    DrawBillboardPro(camera, bill, source, billPositionRotating, billUp, size, origin, rotation, WHITE);
+                    DrawBillboard(camera, bill, billPositionStatic, 2.0f, WHITE);
+                }
+                
+            EndMode3D();
+
+            DrawFPS(10, 10);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadTexture(bill);        // Unload texture
+
+    CloseWindow();              // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}