Started to play with hopengl. It's pretty cool :-) Very easy to use, quite cool :-) Started to look at perf. What interests me most is to see how fast we can make vertex3f calls. Basically, we're testing the speed of the haskell/c boundary, where security(?) and marshalling are going to occur. Yes, we can send the vertices to a vertexarray and not have to handle vertex3f calls, but that's not what I want to measure ;-) So, have a really rough and ready application that draws 45000 triangles a frame, then measures the framerate. Thats about 150,000 calls to vertex3f per frame. The application runs in Java, C#, and now Haskell. Running in ghci, this runs at about 1.5 fps, really ballpark, havent checked I'm really drawing the number of triangles I think I'm drawing, or settings such as backface-culling or shademodel. That's not too bad. I'd like to compile to an executable to increase the framerate, but it's giving me the following output: J:\dev\haskell>ghc -fglasgow-exts -O2 -o OglPerf.exe OglPerf.hs OglPerf.o(.text+0x1f4):ghc3668_0.hc: undefined reference to `glutPostRedisplay@0 ' OglPerf.o(.text+0x255):ghc3668_0.hc: undefined reference to `glVertex3f@12' OglPerf.o(.text+0x1148):ghc3668_0.hc: undefined reference to `glViewport@16' OglPerf.o(.text+0x1157):ghc3668_0.hc: undefined reference to `glMatrixMode@4' OglPerf.o(.text+0x115f):ghc3668_0.hc: undefined reference to `glLoadIdentity@0' OglPerf.o(.text+0x11cc):ghc3668_0.hc: undefined reference to `glFrustum@48' OglPerf.o(.text+0x11db):ghc3668_0.hc: undefined reference to `glMatrixMode@4' OglPerf.o(.text+0x11e3):ghc3668_0.hc: undefined reference to `glLoadIdentity@0' OglPerf.o(.text+0x11fd):ghc3668_0.hc: undefined reference to `glTranslatef@12' OglPerf.o(.text+0x1672):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziVertexSpec_Vertex3_con_info' OglPerf.o(.text+0x1764):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziVertexSpec_Vertex3_con_info' OglPerf.o(.text+0x1856):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziVertexSpec_Vertex3_con_info' OglPerf.o(.text+0x1948):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziVertexSpec_Vertex3_con_info' OglPerf.o(.text+0x1b56):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziPrimitiveMode_Quads_closure' OglPerf.o(.text+0x1de9):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziFramebuffer_marshalClearBuffer_closure' OglPerf.o(.text+0x1e00):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziFramebuffer_sum_closure' OglPerf.o(.text+0x1e42):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziFramebuffer_sum_closure' [...] aphicsziRenderingziOpenGLziGLziStringQueries_Vendor_closure' OglPerf.o(.text+0x340f):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziStringQueries_Renderer_closure' OglPerf.o(.text+0x3634):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziBasicTypes_Enabled_closure' OglPerf.o(.text+0x3668):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziCoordTrans_normalizze_closure' OglPerf.o(.text+0x36c1):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziBasicTypes_Enabled_closure' OglPerf.o(.text+0x3716):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziBasicTypes_Enabled_closure' OglPerf.o(.text+0x374a):ghc3668_0.hc: undefined reference to `OpenGLzm2zi2zi1_Gr aphicsziRenderingziOpenGLziGLziColors_lighting_closure' [...] collect2: ld returned 1 exit status What am I missing?