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Diffstat (limited to 'third_party/webrender/glsl-to-cxx/README.md')
| -rw-r--r-- | third_party/webrender/glsl-to-cxx/README.md | 18 |
1 files changed, 0 insertions, 18 deletions
diff --git a/third_party/webrender/glsl-to-cxx/README.md b/third_party/webrender/glsl-to-cxx/README.md index 54dcbc7d612..1b5b4845d27 100644 --- a/third_party/webrender/glsl-to-cxx/README.md +++ b/third_party/webrender/glsl-to-cxx/README.md @@ -1,21 +1,3 @@ A GLSL to C++ translator. Translates GLSL to vectorized C++. Intended for use with WebRender software backend. - -Architecture ------------- -GLSL code is parsed by the glsl crate. In hir.rs we traverse the resulting AST -and build a higher level representation by doing type checking and name -resolution. The resulting hir tree is traversed by lib.rs to output C++ code. - -The generated C++ code is 4x wider then the original glsl. i.e. a glsl 'float' -becomes a C++ 'Float' which is represented by a xmm register (a vector of 4 floats). -Likewise, a vec4 becomes a struct of 4 'Float's for a total of 4 xmm registers and -16 floating point values. - -Vector branching is flattened to non-branching code that unconditionally runs both -sides of the branch and combines the results with a mask based on the condition. - -The compiler also supports scalarization. Values that are known to be the same -across all vector lanes are translated to scalars instead of vectors. Branches on -scalars are translated as actual branches. |