Update Viewer sample with new examples

samples/wip/viewer/main.cc

@@ -65,7 +65,7 @@ int main()
         view(pos, "Suzanne");
 
         // smooth normals
-        view(polygons(pos).smooth_normals());
+        view(polygons(pos).smooth_normals(), "smoothed normals");
 
         // Configuration nesting
         {
@@ -83,40 +83,40 @@ int main()
         }
 
         // Mapped 1D vertex data
-        view(pos, mapping(vdata).linear({0, 0, 0}, {1, 0, 0}, 0.1f, 0.3f));
+        view(pos, mapping(vdata).linear({0, 0, 0}, {1, 0, 0}, 0.1f, 0.3f), "vertex data");
 
         // Mapped 1D face data
-        view(pos, mapping(fdata).linear({0, 1, 0}, {0, 0, 1}, -0.5f, 0.5f).clamped());
+        view(pos, mapping(fdata).linear({0, 1, 0}, {0, 0, 1}, -0.5f, 0.5f).clamped(), "face data");
 
         // Textured mesh
-        view(pos, textured(uv, tex));
+        view(pos, textured(uv, tex), "textured");
 
         // Textured mesh (async texture)
-        view(pos, textured(uv, atex));
+        view(pos, textured(uv, atex), "textured (async)");
 
         // Simple point cloud
-        view(points(pos));
+        view(points(pos), "point cloud");
 
         // Square, oriented point cloud with adaptive point size
-        view(points(pos).point_size_world(ptsize).normals(vnormals).square());
+        view(points(pos).point_size_world(ptsize).normals(vnormals).square(), "normal oriented squares");
 
         // Points rendered as 3D spheres
-        view(points(pos).spheres().point_size_world(0.03f));
+        view(points(pos).spheres().point_size_world(0.03f), "sphere cloud");
 
         // Simple line soup
-        view(lines(pos));
+        view(lines(pos), "edges");
 
         // Configure view
         {
             auto v = glow::viewer::view();
-            v.view(pos, glow::colors::color(0, 1, 0));
+            v.view(pos, glow::colors::color(0, 1, 0), "configured view");
             // when out-of-scope, v immediately shows
         }
 
         // Multiple objects
         {
             auto v = glow::viewer::view();
-            v.view(polygons(pos).move({-1.5f, 0, 0}), glow::colors::color(1, 0, 0));
+            v.view(polygons(pos).move({-1.5f, 0, 0}), glow::colors::color(1, 0, 0), "multiple objects");
             v.view(polygons(pos).move({+1.5f, 0, 0}), glow::colors::color(0, 0, 1));
 
             // or:
@@ -201,6 +201,31 @@ int main()
         }
     }
 
+    // Create a "headless" screenshot
+    {
+        // Viewer never shows a window, returns once screenshot is rendered
+        GLOW_VIEWER_CONFIG(glow::viewer::headless_screenshot(tg::ivec2(1000, 1000), 32, "demo_screenshot.png"));
+        glow::viewer::view(pos);
+    }
+
+    // Conditional RAII objects
+    {
+        // Use an outer viewer object conditionally
+        auto o = (sizeof(int) > 1) ? glow::viewer::rows() : glow::viewer::nothing();
+
+        {
+            // Camera starting position
+            GLOW_VIEWER_CONFIG(glow::viewer::camera_orientation(125_deg, -15_deg, 1.7f));
+
+            // Tonemapping
+            GLOW_VIEWER_CONFIG(glow::viewer::tonemap_exposure(3.5f));
+
+            // These two either nest into the outer object, or create their own windows
+            view(pos, textured(uv, tex));
+            view(points(pos));
+        }
+    }
+
     // tg objects
     {
         auto v = glow::viewer::grid();
@@ -293,15 +318,5 @@ int main()
         });
     }
 
-    // Alternatively, output a single frame headlessly
-    // auto view = glow::viewer::view(pos);
-    // view->render()->bind().writeToFile("viewer_output.png");
-    // view->to_file("viewer_output.png");
-    // view->to_texture() -> SharedTexture2D/Rect;
-    // view->to_image() -> img;
-    // view->into_file(ostream&);
-    // view->into_texture(SharedTexture2D/Rect);
-    // view->into_image(img&);
-
     return 0;
 }