You need at least Mac OS X Lion (OS X 10.7 or higher) for the basic support of OpenGL 3.2. To use the OpenGL 3.2 Core Profile, just add glutInitDisplayMode(GLUT_3_2_CORE_PROFILE | … | …); in your main-function. You can check it by std::printf(“%s\n%s\n”, glGetString(GL_RENDERER), // e.g. Intel HD Graphics 3000 OpenGL Engine glGetString(GL_VERSION) // e.g. … Read more
This kind of error is common for LWJGL starters. The OpenGL context gets bound to a thread when it’s been created. So you can only access this context from the same thread. As it does not look that you’re working with different threads there might be another cause. Slick2D seems to need a valid OpenGL … Read more
You don’t need to use invisible geometry — Scene Kit can do all the coordinate conversions you need without having to hit test invisible objects. Basically you need to do the same thing you would in a 2D drawing app for moving an object: find the offset between the mouseDown: location and the object position, … Read more
This piece of code captures the OpenGL window and export to a BMP file. You must have FreeImage library to run it. // Make the BYTE array, factor of 3 because it’s RBG. BYTE* pixels = new BYTE[3 * width * height]; glReadPixels(0, 0, width, height, GL_RGB, GL_UNSIGNED_BYTE, pixels); // Convert to FreeImage format & … Read more
Sorry, it hasn’t been replaced with anything. The first idea coming to my mind for emulating it would be the geometry shader. You feed the geometry shader with a line, compute its screen space length and based on that you generate a variable number of sub lines between its start and end vertex. EDIT: Perhaps … Read more
In OpenGL, lines are rasterized using the “Diamond Exit” rule. This is almost the same as saying that the end coordinate is exclusive, but not quite… This is what the OpenGL spec has to say: http://www.opengl.org/documentation/specs/version1.1/glspec1.1/node47.html Also have a look at the OpenGL FAQ, http://www.opengl.org/archives/resources/faq/technical/rasterization.htm, item “14.090 How do I obtain exact pixelization of lines?”. … Read more
Cause: The stdlib.h which ships with the recent versions of Visual Studio has a different (and conflicting) definition of the exit() function. It clashes with the definition in glut.h. Solution: Override the definition in glut.h with that in stdlib.h. Place the stdlib.h line above the glut.h line in your code. #include <stdlib.h> #include <GL/glut.h>
Freeglut’s glutMouseWheelFunc callback is version dependant and not reliable in X. Use standard mouse function and test for buttons 3 and 4. The OpenGlut notes on glutMouseWheelFunc state: Due to lack of information about the mouse, it is impossible to implement this correctly on X at this time. Use of this function limits the portability … Read more
OpenGL should be present already – it will probably be Freeglut / GLUT that is missing. GLUT is very dated now and not actively supported – so you should certainly be using Freeglut instead. You won’t have to change your code at all, and a few additional features become available. You’ll find pre-packaged sets of … Read more
find_package(OpenGL) will find the package for you, but it doesn’t link the package to the target. To link to a library, you can use target_link_libraries(<target> <item>). In addition, you also need to set the include directory, so that the linker knows where to look for things. This is done with the include_directories. An example CMakeLists.txt … Read more