Emulate glReadPixels of GL_ALPHA.

[movit] / util.h

diff --git a/util.h b/util.h
index c59231d205d2537c4ec965a4b5b85cf4162ff8f4..6def56d87614a68454a45d45182e577cf612246f 100644 (file)
--- a/util.h
+++ b/util.h
@@ -3,7 +3,7 @@
 
 // Various utilities.
 
-#include <GL/glew.h>
+#include <epoxy/gl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <Eigen/Core>
@@ -53,6 +53,15 @@ GLuint fill_vertex_attribute(GLuint glsl_program_num, const std::string &attribu
 // Clean up after fill_vertex_attribute().
 void cleanup_vertex_attribute(GLuint glsl_program_num, const std::string &attribute_name, GLuint vbo);
 
+// If v is not already a power of two, return the first higher power of two.
+unsigned next_power_of_two(unsigned v);
+
+// Get a pointer that represents the current OpenGL context, in a cross-platform way.
+// This is not intended for anything but identification (ie., so you can associate
+// different FBOs with different contexts); you should probably not try to cast it
+// back into anything you intend to pass into OpenGL.
+void *get_gl_context_identifier();
+
 }  // namespace movit
 
 #ifdef NDEBUG