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

Examples/Shaders/CustomUniform.cs

@@ -0,0 +1,145 @@
+/*******************************************************************************************
+*
+*   raylib [shaders] example - Apply a postprocessing shader and connect a custom uniform variable
+*
+*   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) 2015 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+using System.Numerics;
+using static Raylib_cs.Raylib;
+
+namespace Examples.Shaders;
+
+public class CustomUniform
+{
+    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 - custom uniform variable");
+
+        // Define the camera to look into our 3d world
+        Camera3D camera = new();
+        camera.Position = new Vector3(8.0f, 8.0f, 8.0f);
+        camera.Target = new Vector3(0.0f, 1.5f, 0.0f);
+        camera.Up = new Vector3(0.0f, 1.0f, 0.0f);
+        camera.FovY = 45.0f;
+        camera.Projection = CameraProjection.CAMERA_PERSPECTIVE;
+
+        Model model = LoadModel("resources/models/barracks.obj");
+        Texture2D texture = LoadTexture("resources/models/barracks_diffuse.png");
+
+        // Set model diffuse texture
+        Raylib.SetMaterialTexture(ref model, 0, MaterialMapIndex.MATERIAL_MAP_ALBEDO, ref texture);
+
+        Vector3 position = new(0.0f, 0.0f, 0.0f);
+
+        // Load postpro shader
+        Shader shader = LoadShader("resources/shaders/glsl330/base.vs",
+                                   "resources/shaders/glsl330/swirl.fs");
+
+        // Get variable (uniform) location on the shader to connect with the program
+        // NOTE: If uniform variable could not be found in the shader, function returns -1
+        int swirlCenterLoc = GetShaderLocation(shader, "center");
+
+        float[] swirlCenter = new float[2] { (float)screenWidth / 2, (float)screenHeight / 2 };
+
+        // Create a RenderTexture2D to be used for render to texture
+        RenderTexture2D target = LoadRenderTexture(screenWidth, screenHeight);
+
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        // Main game loop
+        while (!WindowShouldClose())
+        {
+            // Update
+            //----------------------------------------------------------------------------------
+            Vector2 mousePosition = GetMousePosition();
+
+            swirlCenter[0] = mousePosition.X;
+            swirlCenter[1] = screenHeight - mousePosition.Y;
+
+            // Send new value to the shader to be used on drawing
+            Raylib.SetShaderValue(shader, swirlCenterLoc, swirlCenter, ShaderUniformDataType.SHADER_UNIFORM_VEC2);
+
+            UpdateCamera(ref camera, CameraMode.CAMERA_ORBITAL);
+            //----------------------------------------------------------------------------------
+
+            // Draw
+            //----------------------------------------------------------------------------------
+            BeginDrawing();
+            ClearBackground(Color.RAYWHITE);
+
+            // Enable drawing to texture
+            BeginTextureMode(target);
+            ClearBackground(Color.RAYWHITE);
+
+            BeginMode3D(camera);
+
+            DrawModel(model, position, 0.5f, Color.WHITE);
+            DrawGrid(10, 1.0f);
+
+            EndMode3D();
+
+            DrawText("TEXT DRAWN IN RENDER TEXTURE", 200, 10, 30, Color.RED);
+
+            // End drawing to texture (now we have a texture available for next passes)
+            EndTextureMode();
+
+            BeginShaderMode(shader);
+
+            // NOTE: Render texture must be y-flipped due to default OpenGL coordinates (left-bottom)
+            DrawTextureRec(
+                target.Texture,
+                new Rectangle(0, 0, target.Texture.Width, -target.Texture.Height),
+                new Vector2(0, 0),
+                Color.WHITE
+            );
+
+            EndShaderMode();
+
+            DrawText(
+                "(c) Barracks 3D model by Alberto Cano",
+                screenWidth - 220,
+                screenHeight - 20,
+                10,
+                Color.GRAY
+            );
+
+            DrawFPS(10, 10);
+
+            EndDrawing();
+            //----------------------------------------------------------------------------------
+        }
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        UnloadShader(shader);
+        UnloadTexture(texture);
+        UnloadModel(model);
+        UnloadRenderTexture(target);
+
+        CloseWindow();
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}