c++ - OpenGL/GLUT program built in MSVC doesn't work in DMC
I have developed a landscape rendering engine in OpenGL, using the GLUT toolkit for simplified setup and user interaction. Development was done with MSVC 5, and has been used considerably by several people on various machines. I attempted to bring this project to DMC through the IDDE. I created a new console application, spliced my main() over the auto-generated one, and included all of my source files and the GLUT32.LIB link library (which had been passed through COFF2OMF as described elsewhere). Rather than a scene of rolling green hills and red buildings, slowly fading into the foggy distance, I am now presented with a solid gray screen. No matter how I rotate the camera, I get a solid gray screen. If I switch my program to an overhead view, I can get a solid cyan screen. Also, on some runs, my Vector3D template class (holds a 3 element array of the given type, provides cross product, normalization into unit vectors, etc) starts complaining that it can't normalize a zero-length vector (which is entirely true). I find this odd, because I never generate any zero length vectors, except (apparently) under this compiler. Since I know that DMC is designed for numerical calculations, with options for fast math and accurate math, I have begun to wonder if I am simply setting something wrong in my floating point options. After all, 3D calculations can easily go unstable and be prone to representation roundoff errors. If my fog density was calculated as too high, I wouldn't be able to see anything. If my Vector3D class can't perform math properly, all of my matrix operations are going to stick points in interesting places. Etc and so forth. If some kind of fast and "good enough" floating point is being used, I could end up with all kinds of strange results. Are there any warnings I should be aware of when bringing code that is heavy in floating point calculations from MSVC to DMC? I have tried with and without the "inline 8087" option. I have attempted to debug the problem, but cannot make sense of the debugger. I can't get it to tell me the value of a local automatic variable of type int -- "Query Value" tells me that it is an invalid address, and I can't seem to get any kind of watch expression to understand what variable I am talking about. Also, I have tried in various projects to enable the "Strict ANSI Conformance" option. In every case, I get an error on my #include <windows.h> line that says "unterminated string". The error goes away when I turn off the ANSI compliance option. If it matters any, I am running an Athlon XP under Windows 98SE. DMC is configured to generate Pentium optimized code for a Win95 target. Sorry for packing so many questions in one post -- I intended to separate them, but got jumped with work projects and had to lump them together here... Any help would be appreciated, Mac
Jan 29 2002
Do you use any long doubles, long longs, unsigned long longs, or inline assembly?
Feb 04 2002