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_multi_sample2d.c

@@ -0,0 +1,105 @@
+/*******************************************************************************************
+*
+*   raylib [shaders] example - Multiple sample2D with default batch system
+*
+*   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 3.5 (www.raylib.com)
+*   raylib is licensed under an unmodified zlib/libpng license (View raylib.h for details)
+*
+*   Copyright (c) 2020 Ramon Santamaria (@raysan5)
+*
+********************************************************************************************/
+
+#include "raylib.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;
+
+    InitWindow(screenWidth, screenHeight, "raylib - multiple sample2D");
+
+    Image imRed = GenImageColor(800, 450, (Color){ 255, 0, 0, 255 });
+    Texture texRed = LoadTextureFromImage(imRed);
+    UnloadImage(imRed);
+
+    Image imBlue = GenImageColor(800, 450, (Color){ 0, 0, 255, 255 });
+    Texture texBlue = LoadTextureFromImage(imBlue);
+    UnloadImage(imBlue);
+
+    Shader shader = LoadShader(0, TextFormat("resources/shaders/glsl%i/color_mix.fs", GLSL_VERSION));
+
+    // Get an additional sampler2D location to be enabled on drawing
+    int texBlueLoc = GetShaderLocation(shader, "texture1");
+
+    // Get shader uniform for divider
+    int dividerLoc = GetShaderLocation(shader, "divider");
+    float dividerValue = 0.5f;
+
+    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
+        //----------------------------------------------------------------------------------
+        if (IsKeyDown(KEY_RIGHT)) dividerValue += 0.01f;
+        else if (IsKeyDown(KEY_LEFT)) dividerValue -= 0.01f;
+
+        if (dividerValue < 0.0f) dividerValue = 0.0f;
+        else if (dividerValue > 1.0f) dividerValue = 1.0f;
+
+        SetShaderValue(shader, dividerLoc, &dividerValue, SHADER_UNIFORM_FLOAT);
+        //----------------------------------------------------------------------------------
+
+        // Draw
+        //----------------------------------------------------------------------------------
+        BeginDrawing();
+
+            ClearBackground(RAYWHITE);
+
+            BeginShaderMode(shader);
+
+                // WARNING: Additional samplers are enabled for all draw calls in the batch,
+                // EndShaderMode() forces batch drawing and consequently resets active textures
+                // to let other sampler2D to be activated on consequent drawings (if required)
+                SetShaderValueTexture(shader, texBlueLoc, texBlue);
+
+                // We are drawing texRed using default sampler2D texture0 but
+                // an additional texture units is enabled for texBlue (sampler2D texture1)
+                DrawTexture(texRed, 0, 0, WHITE);
+
+            EndShaderMode();
+
+            DrawText("Use KEY_LEFT/KEY_RIGHT to move texture mixing in shader!", 80, GetScreenHeight() - 40, 20, RAYWHITE);
+
+        EndDrawing();
+        //----------------------------------------------------------------------------------
+    }
+
+    // De-Initialization
+    //--------------------------------------------------------------------------------------
+    UnloadShader(shader);       // Unload shader
+    UnloadTexture(texRed);      // Unload texture
+    UnloadTexture(texBlue);     // Unload texture
+
+    CloseWindow();              // Close window and OpenGL context
+    //--------------------------------------------------------------------------------------
+
+    return 0;
+}