sdl_fb: implement rudimentary sdl fb backend

This uses a simple fixed 640x480 windowed mode (for now).

The SDL2 Renderer & Texture API is used for vsync-synchronized presents.
There's probably excessive copying going on because the rototiller fb
code manages pages and flips but SDL2 doesn't really expose low-level
control of such things.

This backend is quite useful for development purposes, allowing quick
iteration in a windowed environment.

Note this is just the backend implementation, it's dormant code but
trivially activated.

1 files changed, 9 insertions, 0 deletions

diff --git a/src/sdl_fb.h b/src/sdl_fb.h
new file mode 100644
index 0000000..4cd0ee9
--- /dev/null
+++ b/src/sdl_fb.h
@@ -0,0 +1,9 @@
+#ifndef _SDL_FB_H
+#define _SDL_FB_H
+
+typedef struct sdl_fb_t sdl_fb_t;
+
+sdl_fb_t * sdl_fb_new();
+void sdl_fb_free(sdl_fb_t *fb);
+
+#endif