Make combine_two_pixels() handle the fact that the GPU has limited subpixel interpola...

[movit] / init.h

diff --git a/init.h b/init.h
new file mode 100644 (file)
index 0000000..e0dbe63
--- /dev/null
+++ b/init.h
@@ -0,0 +1,21 @@
+#ifndef _INIT_H
+#define _INIT_H
+
+// Initialize the library; in particular, will query the GPU for information
+// that is needed by various components. (In time, for instance, we will query
+// about extensions here.)
+void init_movit();
+
+// GPU features. These are not intended for end-user use.
+
+// Whether init_movit() has been called.
+extern bool movit_initialized;
+
+// An estimate on the number of different levels the linear texture interpolation
+// of the GPU can deliver. My Intel card seems to be limited to 2^6 levels here,
+// while a modern nVidia card (GTX 550 Ti) seem to use 2^8.
+//
+// We currently don't bother to test above 2^10.
+extern float movit_texel_subpixel_precision;
+
+#endif  // !defined(_INIT_H)