Examples: Added null_example/ which is helpful for quick testing on multiple compilers/settings without relyong on graphics library.

examples/null_example/main.cpp

@@ -0,0 +1,33 @@
+// ImGui - null/dummy example application (compile and link imgui with no inputs, no outputs)
+#include <imgui.h>
+#include <stdio.h>
+
+int main(int, char**)
+{
+    ImGuiIO& io = ImGui::GetIO();
+
+    // Build atlas
+    unsigned char* tex_pixels = NULL;
+    int tex_w, tex_h;
+    io.Fonts->GetTexDataAsRGBA32(&tex_pixels, &tex_w, &tex_h);
+
+    for (int n = 0; n < 50; n++)
+    {
+        printf("NewFrame() %d\n", n);
+        io.DisplaySize = ImVec2(1920, 1080);
+        io.DeltaTime = 1.0f / 60.0f;
+        ImGui::NewFrame();
+
+        static float f = 0.0f;
+        ImGui::Text("Hello, world!");
+        ImGui::SliderFloat("float", &f, 0.0f, 1.0f);
+        ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / io.Framerate, io.Framerate);
+        ImGui::ShowTestWindow(NULL);
+
+        ImGui::Render();
+    }
+
+    printf("Shutdown()\n");
+    ImGui::Shutdown();
+    return 0;
+}