Update/merge examples back into main repo (#192)

Examples/Shaders/ModelShader.cs

@@ -0,0 +1,108 @@
+/*******************************************************************************************
+*
+*   raylib [shaders] example - Apply a shader to a 3d model
+*
+*   NOTE: This example requires raylib OpenGL 3.3 or ES2 versions for shaders support,
+*         OpenGL 1.1 does not support shaders, recompile raylib to OpenGL 3.3 version.
+*
+*   NOTE: Shaders used in this example are #version 330 (OpenGL 3.3), to test this example
+*         on OpenGL ES 2.0 platforms (Android, Raspberry Pi, HTML5), use #version 100 shaders
+*         raylib comes with shaders ready for both versions, check raylib/shaders install folder
+*
+*   This example has been created using raylib 1.3 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2014 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+using System.Numerics;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Shaders;
+
+public class ModelShader
+{
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        const int screenWidth = 800;
+        const int screenHeight = 450;
+
+        // Enable Multi Sampling Anti Aliasing 4x (if available)
+        SetConfigFlags(ConfigFlags.FLAG_MSAA_4X_HINT);
+
+        InitWindow(screenWidth, screenHeight, "raylib [shaders] example - model shader");
+
+        // Define the camera to look into our 3d world
+        Camera3D camera = new();
+        camera.Position = new Vector3(4.0f, 4.0f, 4.0f);
+        camera.Target = new Vector3(0.0f, 1.0f, -1.0f);
+        camera.Up = new Vector3(0.0f, 1.0f, 0.0f);
+        camera.FovY = 45.0f;
+        camera.Projection = CameraProjection.CAMERA_PERSPECTIVE;
+
+        Model model = LoadModel("resources/models/watermill.obj");
+        Texture2D texture = LoadTexture("resources/models/watermill_diffuse.png");
+        Shader shader = LoadShader("resources/shaders/glsl330/base.vs",
+                                   "resources/shaders/glsl330/grayscale.fs");
+
+        Raylib.SetMaterialShader(ref model, 0, ref shader);
+        Raylib.SetMaterialTexture(ref model, 0, MaterialMapIndex.MATERIAL_MAP_ALBEDO, ref texture);
+
+        Vector3 position = new(0.0f, 0.0f, 0.0f);
+
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        // Main game loop
+        while (!WindowShouldClose())
+        {
+            // Update
+            //----------------------------------------------------------------------------------
+            UpdateCamera(ref camera, CameraMode.CAMERA_FREE);
+            //----------------------------------------------------------------------------------
+
+            // Draw
+            //----------------------------------------------------------------------------------
+            BeginDrawing();
+            ClearBackground(Color.RAYWHITE);
+
+            BeginMode3D(camera);
+
+            DrawModel(model, position, 0.2f, Color.WHITE);
+
+            DrawGrid(10, 1.0f);
+
+            EndMode3D();
+
+            DrawText(
+                "(c) Watermill 3D model by Alberto Cano",
+                screenWidth - 210,
+                screenHeight - 20,
+                10,
+                Color.GRAY
+            );
+
+            DrawText($"Camera3D position: ({camera.Position})", 600, 20, 10, Color.BLACK);
+            DrawText($"Camera3D target: ({camera.Position})", 600, 40, 10, Color.GRAY);
+
+            DrawFPS(10, 10);
+
+            EndDrawing();
+            //----------------------------------------------------------------------------------
+        }
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        UnloadShader(shader);
+        UnloadTexture(texture);
+        UnloadModel(model);
+
+        CloseWindow();
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}