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

Examples/Shaders/Raymarching.cs

@@ -0,0 +1,121 @@
+/*******************************************************************************************
+*
+*   raylib [shaders] example - Raymarching shapes generation
+*
+*   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 2.0 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2018 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+using System.Numerics;
+using static Raylib_cs.Raylib;
+using static Raylib_cs.ConfigFlags;
+
+namespace Examples.Shaders;
+
+public class Raymarching
+{
+    public const int GlslVersion = 330;
+
+    public static int Main()
+    {
+        // Initialization
+        //--------------------------------------------------------------------------------------
+        int screenWidth = 800;
+        int screenHeight = 450;
+
+        SetConfigFlags(FLAG_WINDOW_RESIZABLE);
+        InitWindow(screenWidth, screenHeight, "raylib [shaders] example - raymarching shapes");
+
+        Camera3D camera = new();
+        camera.Position = new Vector3(2.5f, 2.5f, 3.0f);
+        camera.Target = new Vector3(0.0f, 0.0f, 0.7f);
+        camera.Up = new Vector3(0.0f, 1.0f, 0.0f);
+        camera.FovY = 65.0f;
+
+        // Load raymarching shader
+        // NOTE: Defining 0 (NULL) for vertex shader forces usage of internal default vertex shader
+        Shader shader = LoadShader(null, $"resources/shaders/glsl{GlslVersion}/raymarching.fs");
+
+        // Get shader locations for required uniforms
+        int viewEyeLoc = GetShaderLocation(shader, "viewEye");
+        int viewCenterLoc = GetShaderLocation(shader, "viewCenter");
+        int runTimeLoc = GetShaderLocation(shader, "runTime");
+        int resolutionLoc = GetShaderLocation(shader, "resolution");
+
+        float[] resolution = { (float)screenWidth, (float)screenHeight };
+        Raylib.SetShaderValue(shader, resolutionLoc, resolution, ShaderUniformDataType.SHADER_UNIFORM_VEC2);
+
+        float runTime = 0.0f;
+
+        SetTargetFPS(60);
+        //--------------------------------------------------------------------------------------
+
+        // Main game loop
+        while (!WindowShouldClose())
+        {
+            // Check if screen is resized
+            //----------------------------------------------------------------------------------
+            if (IsWindowResized())
+            {
+                screenWidth = GetScreenWidth();
+                screenHeight = GetScreenHeight();
+                resolution = new float[] { (float)screenWidth, (float)screenHeight };
+                Raylib.SetShaderValue(shader, resolutionLoc, resolution, ShaderUniformDataType.SHADER_UNIFORM_VEC2);
+            }
+
+            // Update
+            //----------------------------------------------------------------------------------
+            UpdateCamera(ref camera, CameraMode.CAMERA_FREE);
+
+            float deltaTime = GetFrameTime();
+            runTime += deltaTime;
+
+            // Set shader required uniform values
+            Raylib.SetShaderValue(shader, viewEyeLoc, camera.Position, ShaderUniformDataType.SHADER_UNIFORM_VEC3);
+            Raylib.SetShaderValue(shader, viewCenterLoc, camera.Target, ShaderUniformDataType.SHADER_UNIFORM_VEC3);
+            Raylib.SetShaderValue(shader, runTimeLoc, runTime, ShaderUniformDataType.SHADER_UNIFORM_FLOAT);
+            //----------------------------------------------------------------------------------
+
+            // Draw
+            //----------------------------------------------------------------------------------
+            BeginDrawing();
+            ClearBackground(Color.RAYWHITE);
+
+            // We only draw a white full-screen rectangle,
+            // frame is generated in shader using raymarching
+            BeginShaderMode(shader);
+            DrawRectangle(0, 0, screenWidth, screenHeight, Color.WHITE);
+            EndShaderMode();
+
+            DrawText(
+                "(c) Raymarching shader by Iñigo Quilez. MIT License.",
+                screenWidth - 280,
+                screenHeight - 20,
+                10,
+                Color.BLACK
+            );
+
+            EndDrawing();
+            //----------------------------------------------------------------------------------
+        }
+
+        // De-Initialization
+        //--------------------------------------------------------------------------------------
+        UnloadShader(shader);
+
+        CloseWindow();
+        //--------------------------------------------------------------------------------------
+
+        return 0;
+    }
+}