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ARB_enhanced_layouts allows multiple output variables to share the same location - and these variables may not have the same sizes. For example, consider these output variables: // consume X/Y/Z components of 6 vectors layout(location = 0) out vec3 a[6]; // consumes W component of the first vector layout(location = 0, component = 3) out float b; Looking at the first declaration, we see that VARYING_SLOT_VAR0 needs 24 components worth of space (vec3 padded out to a vec4, 4 * 6 = 24). But looking at the second declaration, we would think that VARYING_SLOT_VAR0 needs only 4 components of space (a single float padded out to a vec4). nir_setup_outputs() only considered the space requirements of the first declaration it happened to see, so if 'float b' came first, it would underallocate the output register space, causing brw_fs_validator.cpp to assert fail about inst->dst.offset exceeding the register size. Fixes Piglit's tests/spec/arb_enhanced_layouts/execution/component-layout/ vs-to-fs-array-interleave-single-location.shader_test. Thanks to Tim Arceri for finding this bug and writing a test! Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com> |
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File: docs/README.WIN32 Last updated: 21 June 2013 Quick Start ----- ----- Windows drivers are build with SCons. Makefiles or Visual Studio projects are no longer shipped or supported. Run 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. Recipe ------ Building on windows requires several open-source packages. These are steps that work as of this writing. - install python 2.7 - install scons (latest) - install mingw, flex, and bison - install pywin32 from here: http://www.lfd.uci.edu/~gohlke/pythonlibs get pywin32-218.4.win-amd64-py2.7.exe - install git - download mesa from git see https://www.mesa3d.org/repository.html - run scons 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.