Samuel Iglesias Gonsalvez
6a506689db
This is the result of applying several rules: From OpenGL 4.3 spec, section 7.6.2.2 "Standard Uniform Block Layout": "2. If the member is a two- or four-component vector with components consuming N basic machine units, the base alignment is 2N or 4N, respectively." [...] "4. If the member is an array of scalars or vectors, the base alignment and array stride are set to match the base alignment of a single array element, according to rules (1), (2), and (3), and rounded up to the base alignment of a vec4." [...] "7. If the member is a row-major matrix with C columns and R rows, the matrix is stored identically to an array of R row vectors with C components each, according to rule (4)." [...] "When using the std430 storage layout, shader storage blocks will be laid out in buffer storage identically to uniform and shader storage blocks using the std140 layout, except that the base alignment and stride of arrays of scalars and vectors in rule 4 and of structures in rule 9 are not rounded up a multiple of the base alignment of a vec4." In summary: vec2 has a base alignment of 2*N, a row-major mat2xY is stored like an array of Y row vectors with 2 components each. Because of std430 storage layout, the base alignment of the array of vectors is not rounded up to vec4, so it is still 2*N. Fixes 15 dEQP tests: dEQP-GLES31.functional.ssbo.layout.single_basic_type.std430.row_major_lowp_mat2 dEQP-GLES31.functional.ssbo.layout.single_basic_type.std430.row_major_mediump_mat2 dEQP-GLES31.functional.ssbo.layout.single_basic_type.std430.row_major_highp_mat2 dEQP-GLES31.functional.ssbo.layout.single_basic_type.std430.row_major_lowp_mat2x3 dEQP-GLES31.functional.ssbo.layout.single_basic_type.std430.row_major_mediump_mat2x3 dEQP-GLES31.functional.ssbo.layout.single_basic_type.std430.row_major_highp_mat2x3 dEQP-GLES31.functional.ssbo.layout.single_basic_type.std430.row_major_lowp_mat2x4 dEQP-GLES31.functional.ssbo.layout.single_basic_type.std430.row_major_mediump_mat2x4 dEQP-GLES31.functional.ssbo.layout.single_basic_type.std430.row_major_highp_mat2x4 dEQP-GLES31.functional.ssbo.layout.single_basic_array.std430.row_major_mat2 dEQP-GLES31.functional.ssbo.layout.single_basic_array.std430.row_major_mat2x3 dEQP-GLES31.functional.ssbo.layout.single_basic_array.std430.row_major_mat2x4 dEQP-GLES31.functional.ssbo.layout.instance_array_basic_type.std430.row_major_mat2 dEQP-GLES31.functional.ssbo.layout.instance_array_basic_type.std430.row_major_mat2x3 dEQP-GLES31.functional.ssbo.layout.instance_array_basic_type.std430.row_major_mat2x4 v2: - Add spec quote in both commit log and code (Timothy) Signed-off-by: Samuel Iglesias Gonsalvez <siglesias@igalia.com> Reviewed-by: Marta Lofstedt <marta.lofstedt@intel.com>
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 http://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.