Expand interactive sample

glow-extras @ 74c32ddb

-Subproject commit e6a26d9aba5d56f8bcff82eeb882befe5516ee4c
+Subproject commit 74c32ddbaac927c5183e6efaebfc4685ae2fd940

samples/wip/viewer/main.cc

-#include <iostream>
 #include <random>
 
+#include <imgui/imgui.h>
+
 #include <glow/common/str_utils.hh>
 #include <glow/data/TextureData.hh>
 #include <glow/objects/TextureCubeMap.hh>
@@ -166,17 +167,38 @@ int main()
         glow::viewer::view(pos);
 
         // Interactive
+        {
             // Creating renderables is expensive, cache them whenever possible, and capture by value!
-        auto r = glow::viewer::make_renderable(pos);
-
-        glow::viewer::interactive([r](auto dt) {
+            auto r1 = glow::viewer::make_renderable(pos);
+            glow::viewer::interactive([r1](auto dt) {
                 static auto time = 0.f;
                 time += dt;
 
-            r->transform(tg::translation(tg::vec3(tg::sin(tg::angle32::from_radians(time * .5f)) * .5f, 0.f, 0.f)));
+                r1->transform(tg::translation(tg::vec3(tg::sin(tg::angle32::from_radians(time * .5f)) * .5f, 0.f, 0.f)));
 
-            glow::viewer::view(r);
+                // Always a cleared view, resetting accumulation each frame
+                glow::viewer::view_cleared(r1);
             });
+
+            // Using imgui in an interactive view
+            auto r2 = glow::viewer::make_renderable(pos);
+            glow::viewer::interactive([r2](auto) {
+                static float configurable = 0.f;
+
+                ImGui::Begin("Interactive viewer");
+                auto const input = ImGui::SliderFloat("Height", &configurable, -3.f, 3.f);
+                ImGui::End();
+
+                r2->transform(tg::translation(tg::vec3(0.f, configurable, 0.f)));
+                {
+                    auto v = glow::viewer::view(r2);
+
+                    // Conditional clear
+                    if (input)
+                        glow::viewer::clear_accumulation();
+                }
+            });
+        }
     }
 
     // tg objects