git subrepo clone (merge) https://github.com/HarbourMasters/otrgui.git OTRGui

subrepo:
  subdir:   "OTRGui"
  merged:   "a6066a251"
upstream:
  origin:   "https://github.com/HarbourMasters/otrgui.git"
  branch:   "master"
  commit:   "a6066a251"
git-subrepo:
  version:  "0.4.1"
  origin:   "???"
  commit:   "???"

OTRGui/libs/raylib/examples/shaders/shaders_basic_lighting.c

@@ -0,0 +1,152 @@
+/*******************************************************************************************
+*
+*   raylib [shaders] example - basic lighting
+*
+*   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).
+*
+*   This example has been created using raylib 3.8 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Example contributed by Chris Camacho (@codifies, http://bedroomcoders.co.uk/) and 
+*   reviewed by Ramon Santamaria (@raysan5)
+*
+*   Copyright (c) 2019-2021 Chris Camacho (@codifies) and Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.h"
+
+#include "raymath.h"
+
+#define RLIGHTS_IMPLEMENTATION
+#include "rlights.h"
+
+#if defined(PLATFORM_DESKTOP)
+    #define GLSL_VERSION            330
+#else   // PLATFORM_RPI, PLATFORM_ANDROID, PLATFORM_WEB
+    #define GLSL_VERSION            100
+#endif
+
+int main(void)
+{
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const int screenWidth = 800;
+    const int screenHeight = 450;
+
+    SetConfigFlags(FLAG_MSAA_4X_HINT);  // Enable Multi Sampling Anti Aliasing 4x (if available)
+    InitWindow(screenWidth, screenHeight, "raylib [shaders] example - basic lighting");
+
+    // Define the camera to look into our 3d world
+    Camera camera = { 0 };
+    camera.position = (Vector3){ 2.0f, 4.0f, 6.0f };    // Camera position
+    camera.target = (Vector3){ 0.0f, 0.5f, 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 mode type
+
+    // Load plane model from a generated mesh
+    Model model = LoadModelFromMesh(GenMeshPlane(10.0f, 10.0f, 3, 3));
+    Model cube = LoadModelFromMesh(GenMeshCube(2.0f, 4.0f, 2.0f));
+    
+    Shader shader = LoadShader(TextFormat("resources/shaders/glsl%i/base_lighting.vs", GLSL_VERSION),
+                               TextFormat("resources/shaders/glsl%i/lighting.fs", GLSL_VERSION));
+
+    // Get some required shader loactions
+    shader.locs[SHADER_LOC_VECTOR_VIEW] = GetShaderLocation(shader, "viewPos");
+    // NOTE: "matModel" location name is automatically assigned on shader loading, 
+    // no need to get the location again if using that uniform name
+    //shader.locs[SHADER_LOC_MATRIX_MODEL] = GetShaderLocation(shader, "matModel");
+    
+    // Ambient light level (some basic lighting)
+    int ambientLoc = GetShaderLocation(shader, "ambient");
+    SetShaderValue(shader, ambientLoc, (float[4]){ 0.1f, 0.1f, 0.1f, 1.0f }, SHADER_UNIFORM_VEC4);
+
+    // Assign out lighting shader to model
+    model.materials[0].shader = shader;
+    cube.materials[0].shader = shader;
+
+    // Using 4 point lights: gold, red, green and blue
+    Light lights[MAX_LIGHTS] = { 0 };
+    lights[0] = CreateLight(LIGHT_POINT, (Vector3){ -2, 1, -2 }, Vector3Zero(), YELLOW, shader);
+    lights[1] = CreateLight(LIGHT_POINT, (Vector3){ 2, 1, 2 }, Vector3Zero(), RED, shader);
+    lights[2] = CreateLight(LIGHT_POINT, (Vector3){ -2, 1, 2 }, Vector3Zero(), GREEN, shader);
+    lights[3] = CreateLight(LIGHT_POINT, (Vector3){ 2, 1, -2 }, Vector3Zero(), BLUE, shader);
+
+    SetCameraMode(camera, CAMERA_ORBITAL);  // Set an orbital camera mode
+
+    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);              // Update camera
+        
+        // Check key inputs to enable/disable lights
+        if (IsKeyPressed(KEY_Y)) { lights[0].enabled = !lights[0].enabled; }
+        if (IsKeyPressed(KEY_R)) { lights[1].enabled = !lights[1].enabled; }
+        if (IsKeyPressed(KEY_G)) { lights[2].enabled = !lights[2].enabled; }
+        if (IsKeyPressed(KEY_B)) { lights[3].enabled = !lights[3].enabled; }
+        
+        // Update light values (actually, only enable/disable them)
+        UpdateLightValues(shader, lights[0]);
+        UpdateLightValues(shader, lights[1]);
+        UpdateLightValues(shader, lights[2]);
+        UpdateLightValues(shader, lights[3]);
+
+        // Update the shader with the camera view vector (points towards { 0.0f, 0.0f, 0.0f })
+        float cameraPos[3] = { camera.position.x, camera.position.y, camera.position.z };
+        SetShaderValue(shader, shader.locs[SHADER_LOC_VECTOR_VIEW], cameraPos, SHADER_UNIFORM_VEC3);
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            BeginMode3D(camera);
+
+                DrawModel(model, Vector3Zero(), 1.0f, WHITE);
+                DrawModel(cube, Vector3Zero(), 1.0f, WHITE);
+
+                // Draw markers to show where the lights are
+                if (lights[0].enabled) DrawSphereEx(lights[0].position, 0.2f, 8, 8, YELLOW);
+                else DrawSphereWires(lights[0].position, 0.2f, 8, 8, ColorAlpha(YELLOW, 0.3f));
+                if (lights[1].enabled) DrawSphereEx(lights[1].position, 0.2f, 8, 8, RED);
+                else DrawSphereWires(lights[1].position, 0.2f, 8, 8, ColorAlpha(RED, 0.3f));
+                if (lights[2].enabled) DrawSphereEx(lights[2].position, 0.2f, 8, 8, GREEN);
+                else DrawSphereWires(lights[2].position, 0.2f, 8, 8, ColorAlpha(GREEN, 0.3f));
+                if (lights[3].enabled) DrawSphereEx(lights[3].position, 0.2f, 8, 8, BLUE);
+                else DrawSphereWires(lights[3].position, 0.2f, 8, 8, ColorAlpha(BLUE, 0.3f));
+
+                DrawGrid(10, 1.0f);
+
+            EndMode3D();
+
+            DrawFPS(10, 10);
+
+            DrawText("Use keys [Y][R][G][B] to toggle lights", 10, 40, 20, DARKGRAY);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadModel(model);     // Unload the model
+    UnloadModel(cube);      // Unload the model
+    UnloadShader(shader);   // Unload shader
+
+    CloseWindow();          // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}
+