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EXT_framebuffer_multisample is a required subpart of ARB_framebuffer_object, which means that we must support it even on platforms that don't support MSAA. Fortunately EXT_framebuffer_multisample allows for this by allowing GL_MAX_SAMPLES to be set to 1. This leads to a tricky quirk in the GL spec: since GlRenderbufferStorageMultisamples() accepts any value for its "samples" parameter up to and including GL_MAX_SAMPLES, that means that on platforms that don't support MSAA, GL_SAMPLES is allowed to be set to either 0 or 1. On platforms that do support MSAA, GL_SAMPLES=1 is not used; 0 means no MSAA, and 2 or higher means MSAA. In other words, GL_SAMPLES needs to be interpreted as follows: =0 no MSAA (possible on all platforms) =1 no MSAA (only possible on platforms where MSAA unsupported) >1 MSAA (only possible on platforms where MSAA supported) This patch modifies all MSAA-related code to choose between multisampling and single-sampling based on the condition (GL_SAMPLES > 1) instead of (GL_SAMPLES > 0) so that GL_SAMPLES=1 will be treated as "no MSAA". Note that since GL_SAMPLES=1 implies GL_SAMPLE_BUFFERS=1, we can no longer use GL_SAMPLE_BUFFERS to distinguish between MSAA and non-MSAA rendering. Reviewed-by: Jordan Justen <jordan.l.justen@intel.com> Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> |
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File: docs/README.WIN32 Last updated: 23 April 2011 Quick Start ----- ----- Windows drivers are build with SCons. Makefiles or Visual Studio projects are no longer shipped or supported. Run scons osmesa mesagdi to build classic mesa Windows GDI drivers; or scons libgl-gdi to build gallium based GDI driver. This will work both with MSVS or Mingw. Windows Drivers ------- ------- At this time, only the gallium GDI driver is known to work. Source code also exists in the tree for other drivers in src/mesa/drivers/windows, but the status of this code is unknown. General ------- After building, you can copy the above DLL files to a place in your PATH such as $SystemRoot/SYSTEM32. If you don't like putting things in a system directory, place them in the same directory as the executable(s). Be careful about accidentially overwriting files of the same name in the SYSTEM32 directory. The DLL files are built so that the external entry points use the stdcall calling convention. Static LIB files are not built. The LIB files that are built with are the linker import files associated with the DLL files. The si-glu sources are used to build the GLU libs. This was done mainly to get the better tessellator code. If you have a Windows-related build problem or question, please post to the mesa-dev or mesa-users list.