Add testgeometry to draw a non uniform triangle

--use-texture: an option to load icon.bmp as a texture
handle mouse motion: rotate the triangle

test/CMakeLists.txt

@@ -42,6 +42,7 @@ add_executable(testdropfile testdropfile.c)
 add_executable(testerror testerror.c)
 add_executable(testfile testfile.c)
 add_executable(testgamecontroller testgamecontroller.c)
+add_executable(testgeometry testgeometry.c)
 add_executable(testgesture testgesture.c)
 add_executable(testgl2 testgl2.c)
 add_executable(testgles testgles.c)