Merge branch 'feature/add-interactive-viewer' into 'develop'

Interactive viewer samples

See merge request Glow/glow-samples!9

glow @ 20f6d1bf

-Subproject commit 3349193c2c4b6b311616bec86b5345a780d0add5
+Subproject commit 20f6d1bf4cf07ea9232c20b510f069b3e16eda54

glow-extras @ 58093524

-Subproject commit 1ac889e244d8047c429b7c3a13cc9a6f562de8e0
+Subproject commit 5809352490444801aa4da3911f9558e91a6c2417

polymesh @ 4d43aff5

-Subproject commit 6c22fa0315f450b7dbd48b5555fbbff2a80c6bcd
+Subproject commit 4d43aff5521c251531f67974b491efa860f9665e

typed-geometry @ b34be03e

-Subproject commit 78c765799fea9fa305e9cb9eda0ba5cefedaefde
+Subproject commit b34be03e5f3283b50e0962c9a5de83d6c8e9c1da

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>
@@ -16,8 +17,6 @@
 
 #include <typed-geometry/tg.hh>
 
-const bool sCustomSkybox = false;
-
 int main()
 {
     std::string const dataPath = glow::util::pathOf(__FILE__) + "/../../../data/";
@@ -25,16 +24,6 @@ int main()
     // Create a context
     glow::glfw::GlfwContext ctx;
 
-    if (sCustomSkybox)
-    {
-        // Load a skybox, init viewer
-        auto const skyboxPath = dataPath + "ibl/bell_park/skybox/skybox_";
-        auto skybox = glow::TextureCubeMap::createFromData(
-            glow::TextureData::createFromFileCube(skyboxPath + "posx.hdr", skyboxPath + "negx.hdr", skyboxPath + "posy.hdr", skyboxPath + "negy.hdr",
-                                                  skyboxPath + "posz.hdr", skyboxPath + "negz.hdr", glow::ColorSpace::sRGB));
-        glow::viewer::Viewer::GlobalInit(skybox);
-    }
-
     std::uniform_real_distribution<float> dis(0.0f, 1.0f);
     std::default_random_engine rng;
 
@@ -63,17 +52,32 @@ int main()
     {
         auto v = glow::viewer::grid();
 
+        // Scoped configuration
+        {
+            GLOW_VIEWER_CONFIG(glow::viewer::no_grid);
+
             // ADL view
             view(pos);
+        }
+
 
         // smooth normals
         view(polygons(pos).smooth_normals());
 
+        // Configuration nesting
+        {
+            GLOW_VIEWER_CONFIG(glow::viewer::print_mode);
+
             // Colored faces
             view(pos, fcolors);
 
+            {
+                GLOW_VIEWER_CONFIG(glow::viewer::no_shadow);
+
                 // Colored vertices
                 view(pos, vcolors);
+            }
+        }
 
         // Mapped 1D vertex data
         view(pos, mapping(vdata).linear({0, 0, 0}, {1, 0, 0}, 0.1f, 0.3f));
@@ -110,7 +114,7 @@ int main()
             v.view(polygons(pos).move({+1.5f, 0, 0}), glow::colors::color(0, 0, 1));
 
             // or:
-            v.view(pos, scale(glm::vec3(0.5f, 1, 1.5f)), glow::colors::color(0, 1, 0));
+            v.view(pos, scaling(tg::size3(0.5f, 1, 1.5f)), glow::colors::color(0, 1, 0));
         }
 
         // Complex material
@@ -149,14 +153,47 @@ int main()
             // when out-of-scope, v immediately shows
         }
 
-        // Interaction
+        // Picking
         {
             // TODO
         }
+    }
 
-        // Picking
+    // Interactive
     {
-            // TODO
+        auto v = glow::viewer::grid();
+
+        // Non-interactive
+        glow::viewer::view(pos);
+
+        // Interactive
+        {
+            // Creating renderables is expensive, cache them whenever possible, and capture by value!
+            auto r1 = glow::viewer::make_renderable(pos);
+            glow::viewer::interactive([r1](auto dt) {
+                static auto time = 0.f;
+                time += dt;
+
+                // Always a cleared view, resetting accumulation each frame
+                glow::viewer::view_cleared(r1, tg::translation(tg::vec3(tg::sin(tg::radians(time * .5f)) * .5f, 0.f, 0.f)));
+            });
+
+            // 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();
+                {
+                    auto v = glow::viewer::view(r2, tg::translation(tg::vec3(0.f, configurable, 0.f)));
+
+                    // Conditional clear
+                    if (input)
+                        glow::viewer::clear_accumulation();
+                }
+            });
         }
     }
 
@@ -211,11 +248,6 @@ int main()
         }
     }
 
-    // Animation
-    {
-        // TODO
-    }
-
     // Alternatively, output a single frame headlessly
     // auto view = glow::viewer::view(pos);
     // view->render()->bind().writeToFile("viewer_output.png");