diff options
Diffstat (limited to 'mesalib/src/glsl/README')
| -rw-r--r-- | mesalib/src/glsl/README | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/mesalib/src/glsl/README b/mesalib/src/glsl/README index 0a0afccdc..2f93f12ff 100644 --- a/mesalib/src/glsl/README +++ b/mesalib/src/glsl/README @@ -8,7 +8,7 @@ passed straight through. See glcpp/* 2) lex and yacc-based parser takes the preprocessed string and generates the AST (abstract syntax tree). Almost no checking is -performed in this stage. See glsl_lexer.lpp and glsl_parser.ypp. +performed in this stage. See glsl_lexer.ll and glsl_parser.yy. 3) The AST is converted to "HIR". This is the intermediate representation of the compiler. Constructors are generated, function @@ -34,7 +34,7 @@ linked in. 7) The driver performs code generation out of the IR, taking a linked shader program and producing a compiled program for each stage. See -ir_to_mesa.cpp for Mesa IR code generation. +../mesa/program/ir_to_mesa.cpp for Mesa IR code generation. FAQ: @@ -126,7 +126,7 @@ optimizations like CSE where one must navigate an expression tree. Q: Why no SSA representation? -A: Converting an IR tree to SSA form makes dead code elmimination, +A: Converting an IR tree to SSA form makes dead code elimination, common subexpression elimination, and many other optimizations much easier. However, in our primarily vector-based language, there's some major questions as to how it would work. Do we do SSA on the scalar @@ -134,9 +134,9 @@ or vector level? If we do it at the vector level, we're going to end up with many different versions of the variable when encountering code like: -(assign (constant bool (1)) (swiz x (var_ref __retval) ) (var_ref a) ) -(assign (constant bool (1)) (swiz y (var_ref __retval) ) (var_ref b) ) -(assign (constant bool (1)) (swiz z (var_ref __retval) ) (var_ref c) ) +(assign (constant bool (1)) (swiz x (var_ref __retval) ) (var_ref a) ) +(assign (constant bool (1)) (swiz y (var_ref __retval) ) (var_ref b) ) +(assign (constant bool (1)) (swiz z (var_ref __retval) ) (var_ref c) ) If every masked update of a component relies on the previous value of the variable, then we're probably going to be quite limited in our @@ -183,7 +183,7 @@ ir_validate.cpp (check users have the right types) You may also need to update the backends if they will see the new expr type: -../mesa/shaders/ir_to_mesa.cpp +../mesa/program/ir_to_mesa.cpp You can then use the new expression from builtins (if all backends would rather see it), or scan the IR and convert to use your new @@ -225,4 +225,4 @@ Initially, there really wasn't one. We have since adopted one: - Files that implement a class that is used throught the code should take the name of that class (e.g., ir_hierarchical_visitor.cpp). - Files that contain code not fitting in one of the previous - categories should have a sensible name (e.g., glsl_parser.ypp). + categories should have a sensible name (e.g., glsl_parser.yy). |