1 files changed, 28 insertions, 0 deletions

diff --git a/gfx-iso/include/isogfx/backend.h b/gfx-iso/include/isogfx/backend.h
new file mode 100644
index 0000000..172991d
--- /dev/null
+++ b/gfx-iso/include/isogfx/backend.h
@@ -0,0 +1,28 @@
+#pragma once
+
+#include <stdbool.h>
+
+typedef struct Gfx    Gfx;
+typedef struct IsoGfx IsoGfx;
+
+typedef struct IsoBackend IsoBackend;
+
+/// Initialize the backend.
+IsoBackend* IsoBackendInit(const IsoGfx*);
+
+/// Shut down the backend.
+void IsoBackendShutdown(IsoBackend**);
+
+/// Notify the backend of a window resize event.
+/// This allows the backend to determine how to position and scale the iso
+/// screen buffer on the graphics window.
+void IsoBackendResizeWindow(IsoBackend*, const IsoGfx*, int width, int height);
+
+/// Render the iso screen to the graphics window.
+void IsoBackendRender(const IsoBackend*, const IsoGfx*);
+
+/// Map window coordinates to iso space coordinates.
+/// This takes into account any possible resizing done by the backend in
+/// response to calls to IsoBackendResizeWindow().
+bool IsoBackendGetMousePosition(
+    const IsoBackend*, double window_x, double window_y, double* x, double* y);