Add project files.

tests/editor_headless/impl.cpp

@@ -0,0 +1,24 @@
+// No-op raylib / ImGui back-ends + scripted mouse state so the editor's logic can run headless.
+#include <cstdarg>
+#include <cstdlib>
+#include <cstdio>
+#include "raylib.h"
+#include "imgui.h"
+#include "rlgl.h"
+
+void *MemAlloc(unsigned int size) { return calloc(1, size); }
+void MemFree(void *p) { free(p); }
+void UploadMesh(Mesh *, bool) {}
+void UnloadMesh(Mesh m) { MemFree(m.vertices); MemFree(m.texcoords); MemFree(m.normals); MemFree(m.colors); }
+bool FileExists(const char *) { return false; }
+bool DirectoryExists(const char *) { return false; }
+void TraceLog(int, const char *, ...) {}
+
+static ImGuiIO g_io;
+bool g_down[3], g_clicked[3], g_released[3];
+ImGuiIO &ImGui::GetIO() { return g_io; }
+bool ImGui::IsMouseDown(ImGuiMouseButton b) { return g_down[b]; }
+bool ImGui::IsMouseClicked(ImGuiMouseButton b, bool) { return g_clicked[b]; }
+bool ImGui::IsMouseReleased(ImGuiMouseButton b) { return g_released[b]; }
+bool ImGui::IsKeyDown(ImGuiKey) { return false; }
+bool ImGui::IsKeyPressed(ImGuiKey, bool) { return false; }