Ian Romanick [Tue, 20 Jul 2010 18:28:31 +0000 (11:28 -0700)]
glsl2: Add function to import function prototypes from one IR tree to another
Carl Worth [Wed, 21 Jul 2010 20:50:38 +0000 (13:50 -0700)]
ir_to_mesa: Add missing initializion of lod_info variable.
To quiet a compiler warning.
Carl Worth [Wed, 21 Jul 2010 20:43:47 +0000 (13:43 -0700)]
glsl: Fix missing initialization of yylloc.source
In both the preprocessor and in the compiler proper, we use a custom
yyltype struct to allow tracking the source-string number in addition
to line and column. However, we were previously relying on bison's
default initialization of the yyltype struct which of course is not
aware of the source field and leaves it uninitialized.
We fix this by defining our own YYLLOC_DEFAULT macro expanding on the
default version (as appears in the bison manual) and adding
initialization of yylloc.source.
Carl Worth [Wed, 21 Jul 2010 18:23:51 +0000 (11:23 -0700)]
glsl: Correctly handle unary plus operator.
Previously, any occurence of the unary plus operator would trigger a
bogus type mismatch error. Fix this by making the ast_plus case look
more like the ast_neg case as far as type-checking is concerned.
With this change the shaders/CorrectPreprocess8.frag test in piglit
now passes.
Ian Romanick [Tue, 20 Jul 2010 22:33:40 +0000 (15:33 -0700)]
glsl2: glsl_type has its own talloc context, don't pass one in
Ian Romanick [Tue, 20 Jul 2010 20:36:32 +0000 (13:36 -0700)]
linker: Do post-link lowering and optimization
The lowering code should probably be moved elsewhere.
Ian Romanick [Tue, 20 Jul 2010 18:27:38 +0000 (11:27 -0700)]
glsl2: Implement utility routine to talloc reparent an IR tree
Ian Romanick [Sun, 18 Jul 2010 22:59:43 +0000 (15:59 -0700)]
glsl2: Add a constructor for _mesa_glsl_parse_state
Coming changes to the handling of built-in functions necessitate this.
Ian Romanick [Tue, 20 Jul 2010 00:12:42 +0000 (17:12 -0700)]
glsl2: Add and use new variable mode ir_var_temporary
This is quite a large patch because breaking it into smaller pieces
would result in the tree being intermitently broken. The big changes
are:
* Add the ir_var_temporary variable mode
* Change the ir_variable constructor to take the mode as a
parameter and correctly specify the mode for all ir_varables.
* Change the linker to not cross validate ir_var_temporary
variables.
* Change the linker to pull all ir_var_temporary variables from
global scope into 'main'.
Eric Anholt [Wed, 21 Jul 2010 00:19:57 +0000 (17:19 -0700)]
ir_to_mesa: Validate the linked shaders as well.
This caught the failure in cloning of ir_dereference_record.
Eric Anholt [Wed, 21 Jul 2010 00:18:57 +0000 (17:18 -0700)]
glsl2: Check that nodes in a valid tree aren't error-type.
We're good at propagating error types around, but finding when the
first one was triggered can be painful if we aren't paying attention.
Eric Anholt [Wed, 21 Jul 2010 00:17:47 +0000 (17:17 -0700)]
glsl2: strdup the field names used in dereference_record.
Otherwise, after linking and freeing the old data, the pointer would
dangle. Partial fix for glsl1-struct*.
Eric Anholt [Tue, 20 Jul 2010 23:47:25 +0000 (16:47 -0700)]
glsl2: talloc the glsl_struct_field[] we use to look up structure types.
Since the types are singletons across the lifetime of the compiler,
repeatedly compiling a program with the same structure type defined
would drop a copy of the array on the floor per compile.
This is a bit tricky because the static GLSL types are not called with
the talloc-based new, so we have to use the global type context, which
may not be initialized yet.
Eric Anholt [Tue, 20 Jul 2010 23:38:23 +0000 (16:38 -0700)]
glsl2: Don't claim a match on structure types with different field names.
We regularly do lookups on the field names of the structure to find
the types within the struct, so returning a structure type with bad
names will lead to lots of error types being found.
Kenneth Graunke [Sun, 18 Jul 2010 05:50:26 +0000 (22:50 -0700)]
glsl2: Add support for the .length() method on arrays.
Fixes piglit test glsl-array-length, and provides proper error messages
for negative piglit tests array-length-110.frag, array-length-unsized.frag,
and array-length-args.frag.
Kenneth Graunke [Sun, 18 Jul 2010 05:42:35 +0000 (22:42 -0700)]
glsl2: Remove incorrect assertion in the parser.
This assertion is triggered by method calls (i.e. array.length()), where
subexpressions[1] is an ast_function_call expression. Since the
assertion itself had a comment saying it could be removed eventually,
simply do so.
Causes negative glslparser tests array-length-110.frag,
array-length-args.frag, and array-length-unsized.frag to pass, but only
because the length() method is not supported yet.
Kenneth Graunke [Sat, 17 Jul 2010 01:28:44 +0000 (18:28 -0700)]
glsl2: Disallow non-constant array indexing for unsized arrays.
Fixes piglit test unsized-array-non-const-index.vert.
Kenneth Graunke [Thu, 15 Jul 2010 17:27:53 +0000 (10:27 -0700)]
ir_constant_expression: Remove pointless use of variable_referenced.
ir_dereference_variable always references an ir_variable, so there's no
point in calling a function and NULL-checking the result.
Kenneth Graunke [Thu, 15 Jul 2010 17:20:51 +0000 (10:20 -0700)]
ir_constant_expression: Use "this" pointer directly.
In ir_expression's signature, I replaced ir->operands[i] with op[i] as
it is more concise; an assertion already ensures these are equal.
Kenneth Graunke [Thu, 15 Jul 2010 17:09:09 +0000 (10:09 -0700)]
ir_constant_expression: Convert from a visitor to a virtual function.
The constant_expression_wrapper was already the only external API, and
much of the internal code used it anyway. Also, it wouldn't ever visit
non-rvalue ir_instructions, so using a visitor seemed a bit unnecessary.
This uses "ir_foo *ir = this;" lines to avoid code churn. These should
be removed.
Kenneth Graunke [Mon, 12 Jul 2010 20:55:10 +0000 (13:55 -0700)]
glsl2: Move constant_expression_value method to ir_rvalue.
This prevents top-level callers from asking for the value of something
that is guaranteed not to have one.
Carl Worth [Tue, 20 Jul 2010 23:44:03 +0000 (16:44 -0700)]
glcpp: Avoid accidental token pasting in preprocessed result.
Consider this test case:
#define EMPTY
int foo = 1+EMPTY+4;
The expression should compile as the sequence of tokens 1, PLUS,
UNARY_POSITIVE, 4. But glcpp has been failing for this case since it
results in the string "1++4" which a compiler correctly sees as a
syntax error, (1, POST_INCREMENT, 4).
We fix this by changing any macro with an empty definition to result
in a single SPACE token rather than nothing. This then gives "1+ +4"
which compiles correctly.
This commit does touch up the two existing test cases which already
have empty macros, (to add the space to the expected result).
It also adds a new test case to exercise the above scenario.
Carl Worth [Tue, 20 Jul 2010 22:56:02 +0000 (15:56 -0700)]
glcpp: Add missing include in xtalloc.c
Without this, the compiler was legitimately complaining about missing
declarations for all of the functions being defined here.
Carl Worth [Tue, 20 Jul 2010 22:55:21 +0000 (15:55 -0700)]
glcpp: Add static keyword to several functions in the parser.
This quiets warnings about missing declarations otherwise.
Carl Worth [Tue, 20 Jul 2010 22:53:14 +0000 (15:53 -0700)]
glcpp: Avoid warnings in generated flex code.
We define the YY_NO_INPUT macro to avoid one needless function being
generated.
for the other needless functions, (yyunput and yy_top_state), we add a
new UNREACHABLE start condition and call these functions from an
action there. This doesn't change functionality at all, (since we
never enter the UNREACHABLE start condition), but makes the compiler
stop complaining about these two functions being defined but not used.
Carl Worth [Tue, 20 Jul 2010 22:03:20 +0000 (15:03 -0700)]
glcpp-lex: Declare some generated functions to eliminate compiler warnings.
It's really a bug in flex that these functions are generated with neither
a declaration nor the 'static' keyword, but we can at least avoid the
warnings this way.
Carl Worth [Tue, 20 Jul 2010 21:13:32 +0000 (14:13 -0700)]
glcpp: Fix support for nested #ifdef and nested #ifndef
Previously, if the outer #ifdef/#ifndef evaluated to false, the inner
directive would not be parsed correctly, (the identifier as the subject
of the #ifdef/#ifndef would inadvertently be skipped along with the other
content correctly being skipped).
We fix this by setting the lexing_if state in each case here.
We also add a new test to the test suite to ensure that this case is tested.
Carl Worth [Tue, 20 Jul 2010 20:16:17 +0000 (13:16 -0700)]
glcpp: Support #if(expression) with no intervening space.
And add a test case to ensure that this works.
Carl Worth [Tue, 20 Jul 2010 01:02:12 +0000 (18:02 -0700)]
glcpp: Fix use-after-free error from #undef directive.
By taking advantage of the recently-added hash_table_remove function.
With this change, all existing tests are now valgrind-clean.
Carl Worth [Tue, 20 Jul 2010 01:01:43 +0000 (18:01 -0700)]
hash_table: Add new hash_table_remove function.
To allow for the removal of a single element from a hash table.
Carl Worth [Tue, 20 Jul 2010 00:49:23 +0000 (17:49 -0700)]
glcpp: Make test suite test for valgrind cleanliness.
As it turns out, 4 of our current tests are not valgrind clean,
(use after free errors or so), so this will be helpful for
investigating and fixing those.
Carl Worth [Tue, 20 Jul 2010 00:48:17 +0000 (17:48 -0700)]
glcpp: Make test suite report final count of passed/total tests.
And report PASS or FAIL for each test along the way as well.
Carl Worth [Wed, 14 Jul 2010 21:48:15 +0000 (14:48 -0700)]
Build a standalone glcpp binary.
This is convenient for testing the preprocessor independent of the rest of
mesa, (just run glcpp-test in the src/glsl/glcpp/tests).
Carl Worth [Wed, 14 Jul 2010 19:45:58 +0000 (12:45 -0700)]
glcpp: Delete copies of hash_table.c, hash_table.h, and other headers.
These were only ever intended to exist in the original, standalone
implementation of glcpp, (with the idea of dropping them as soon as
the code moved into mesa). The current build system wasn't compiling
this C file, but the presence of the header files could cause problems
if the two copies diverge in the future.
We head those problems off by deleting al of these redundant files.
Eric Anholt [Tue, 20 Jul 2010 23:03:46 +0000 (16:03 -0700)]
glsl2: Fix handling of out values in function inlining.
The parameters[i] is our inlined variables representing the
parameters, so they are always ir_var_auto. Walk the signature params
in handling "out" values like we do for "in" values to find the mode.
Fixes (with the previous 2 commits):
glsl1-function call with in, out params
glsl1-function call with inout params
Eric Anholt [Tue, 20 Jul 2010 21:21:43 +0000 (14:21 -0700)]
glsl2: Don't mark a variable as constant if it was used as an out param.
Eric Anholt [Tue, 20 Jul 2010 22:50:48 +0000 (15:50 -0700)]
glsl2: Always insert function calls into the instruction stream.
If they have a return value, this means putting it into a temporary
and making a deref of the temp be the rvalue, since we don't know if
the rvalue will be used or not.
Eric Anholt [Tue, 20 Jul 2010 21:03:35 +0000 (14:03 -0700)]
glsl2: Add definitions of the builtin constants present in GLSL 1.10.
Fixes:
glsl1-built-in constants
Eric Anholt [Tue, 20 Jul 2010 19:22:37 +0000 (12:22 -0700)]
glsl2: Fix asin() implementation.
I'd flipped around the order of two operations in paren-balancing
adventures, and left out the multiply by sign(x) required for negative x.
Fixes:
glsl1-acos(vec4) function
glsl1-asin(vec4) function
glsl1-atan(vec4) function
Eric Anholt [Tue, 20 Jul 2010 18:56:48 +0000 (11:56 -0700)]
glsl2: notEqual() produces a boolean value, not the base type of the args.
Fixes:
glsl1-vector relational (bvec2 ==,!=)
glsl1-vector relational (vec4 !=)
Eric Anholt [Tue, 20 Jul 2010 18:43:28 +0000 (11:43 -0700)]
glsl2: Constant-fold assignment conditions.
Ian Romanick [Tue, 20 Jul 2010 18:37:45 +0000 (11:37 -0700)]
glsl2: Don't validate IR if there were compilation errors
Eric Anholt [Tue, 20 Jul 2010 18:14:33 +0000 (11:14 -0700)]
ir_to_mesa: Fix swizzled writemasks with swapped component ordering.
I hadn't noticed you could do this, but glsl1 tests caught it. Fixes:
glsl1-Swizzled writemask
glsl1-Swizzled writemask (2)
glsl1-Swizzled writemask (rgba)
glsl1-Swizzled writemask (stpq)
Ian Romanick [Fri, 16 Jul 2010 23:00:07 +0000 (16:00 -0700)]
linker: Remove the FINISHME comment for intrastage linking
Ian Romanick [Fri, 16 Jul 2010 22:52:40 +0000 (15:52 -0700)]
linker: Remove redundant check for 'main' in shaders
This is now handled in link_intrastage_shaders.
Ian Romanick [Fri, 16 Jul 2010 22:51:50 +0000 (15:51 -0700)]
linker: Track and validate GLSL versions used in shaders
Ian Romanick [Fri, 16 Jul 2010 22:31:23 +0000 (15:31 -0700)]
glsl2: Use Elements macro
Ian Romanick [Fri, 16 Jul 2010 03:20:36 +0000 (20:20 -0700)]
linker: Recursively resolve function calls in imported functions
Ian Romanick [Fri, 16 Jul 2010 02:28:32 +0000 (19:28 -0700)]
linker: look up function signatures during linking instead of using callee
Instead of using ir_call::callee, search for the signature in the
linked shader. This will allow resolving calls from functions
imported from other shaders. The ir_call::callee pointer in the
imported function will still reference a signature in the original shader.
Ian Romanick [Thu, 15 Jul 2010 20:32:27 +0000 (13:32 -0700)]
linker: Pull find_matching_signature out of call_link_visitor
The list of shaders to search needs to be provided as an explicit
parameter to support coming changes. At that point there is no reason
for it to be in the class. Also, fix some of the 'const' decorators.
Ian Romanick [Thu, 15 Jul 2010 20:09:25 +0000 (13:09 -0700)]
glsl2: Explicitly walk lists in ir_function::parameter_lists_match
Give ir_function::parameter_lists_match_exist similar treatment. Make
the parameters const, and propogate the constness as far as it will
trivially go.
Ian Romanick [Wed, 14 Jul 2010 20:22:12 +0000 (13:22 -0700)]
linker: Add comment about bug in initializer handling
Ian Romanick [Wed, 14 Jul 2010 00:36:13 +0000 (17:36 -0700)]
linker: First bits of intrastage, intershader function linking
This handles the easy case of linking a function in a different
compilation unit that doesn't call any functions or reference any
global variables.
Ian Romanick [Wed, 14 Jul 2010 00:34:02 +0000 (17:34 -0700)]
ir_function_signature: Make actual_parameters public
Ian Romanick [Wed, 14 Jul 2010 00:31:12 +0000 (17:31 -0700)]
linker: Remove some unnecessary includes
Kenneth Graunke [Mon, 19 Jul 2010 21:49:34 +0000 (14:49 -0700)]
exec_list: Fix foreach_list_safe.
It now works correctly when nodes are removed, as it was originally
intended to do; it no longer processes nodes added to the list before
the current node, nor those added immediately after the current node.
This matches the behavior of Linux's list_for_each_safe.
Ian Romanick [Mon, 19 Jul 2010 19:34:56 +0000 (12:34 -0700)]
linker: Use foreach_list_safe in move_non_declarations
The node being processed may be removed from the list and put in a
different list. Not using the safe version caused list processing to
change streams after moving a node.
Ian Romanick [Mon, 19 Jul 2010 19:33:54 +0000 (12:33 -0700)]
linker: Move global instructions from the linked shader first
For the shader containing 'main', use the linked shader (i.e., the
clone of the original shader that contained main) as the source for
global instructions to move into main.
Eric Anholt [Mon, 19 Jul 2010 18:52:54 +0000 (11:52 -0700)]
glsl2: Fix lexing of octal values, including "0".
When faced with a constructor like 'ivec4(0, 2, 0, 0)', we would
manage to get a value of 2 instead of 0 for the first "0". Usually 2
characters past "0" would point at some junk and lex as 0 anyway.
Fixes glsl-octal and glsl-unused-varyings.
Eric Anholt [Mon, 19 Jul 2010 17:31:03 +0000 (10:31 -0700)]
glsl2: Fix the expression type for atan's pi * sign(y).
Fixes CorrectFunction.vert.
Eric Anholt [Mon, 19 Jul 2010 17:21:58 +0000 (10:21 -0700)]
i915: Ask the compiler to flatten out all the if statements that it can.
Eric Anholt [Mon, 19 Jul 2010 16:36:43 +0000 (09:36 -0700)]
glsl2: Add a pass for converting if statements to conditional assignment.
This will be used on 915 and similar hardware of that generation.
Eric Anholt [Mon, 19 Jul 2010 16:05:42 +0000 (09:05 -0700)]
glsl2: Give IR nodes a type field.
This is a big deal for debugging if nothing else ("what class is this
ir_instruction, really?"), but is also nice for avoiding building a
whole visitor or an if (node->as_whatever() || node->as_other_thing())
chain.
Eric Anholt [Mon, 19 Jul 2010 15:55:54 +0000 (08:55 -0700)]
ir_to_mesa: Do validation on the IR tree.
Eric Anholt [Mon, 19 Jul 2010 16:44:30 +0000 (09:44 -0700)]
ir_to_mesa: Don't do lowering passes on an errored-out shader.
Eric Anholt [Mon, 19 Jul 2010 00:57:19 +0000 (17:57 -0700)]
ir_to_mesa: Rename struct temp_entry, which is used for all variables now.
Eric Anholt [Tue, 13 Jul 2010 19:22:05 +0000 (12:22 -0700)]
ir_to_mesa: Add support for function calls.
Unlike the previous compiler, in this case we emit only one copy of
the function regardless of how many times it's called.
Eric Anholt [Mon, 19 Jul 2010 00:45:16 +0000 (17:45 -0700)]
glsl2: Remove the const disease from function signature's callee.
Eric Anholt [Tue, 13 Jul 2010 22:37:57 +0000 (15:37 -0700)]
glsl2: Make cross() be an expression operation.
ARB_fp, ARB_vp, Mesa IR, and the 965 vertex shader all have
instructions for cross. Shaves 12 Mesa instructions off of a
66-instruction shader I have.
Eric Anholt [Mon, 19 Jul 2010 00:47:15 +0000 (17:47 -0700)]
glsl2: Fix warning from always-false assert not being known to not return.
Kenneth Graunke [Wed, 14 Jul 2010 20:22:07 +0000 (13:22 -0700)]
ast_function: Actually do type conversion on function arguments.
Kenneth Graunke [Wed, 14 Jul 2010 19:14:26 +0000 (12:14 -0700)]
exec_list: Add a new replace_with method.
Kenneth Graunke [Mon, 12 Jul 2010 20:54:36 +0000 (13:54 -0700)]
Refresh autogenerated file builtin_function.cpp.
Kenneth Graunke [Sat, 10 Jul 2010 19:54:41 +0000 (12:54 -0700)]
glsl2/builtins: Rework clamp to use scalar/vector combinations.
Kenneth Graunke [Fri, 9 Jul 2010 19:12:41 +0000 (12:12 -0700)]
glsl2/builtins: Rework min/max to use scalar/vector combinations.
Kenneth Graunke [Wed, 14 Jul 2010 18:28:40 +0000 (11:28 -0700)]
ir_constant_expression: Add support for ir_binop_mod.
Kenneth Graunke [Fri, 9 Jul 2010 18:53:56 +0000 (11:53 -0700)]
ir_constant_expression: Add support for ir_binop_min and ir_binop_max.
These now work on scalar/vector combos. Semantically, if a is a scalar,
min(a, vec2(x,y)) == vec2(min(a,x), min(a,y))
Kenneth Graunke [Fri, 9 Jul 2010 06:35:09 +0000 (23:35 -0700)]
ir_constant_expression: Add support for ir_binop_pow.
Kenneth Graunke [Fri, 9 Jul 2010 06:29:37 +0000 (23:29 -0700)]
ir_constant_expression: Add support for ir_unop_cos.
Kenneth Graunke [Fri, 9 Jul 2010 06:28:50 +0000 (23:28 -0700)]
ir_constant_expression: Add support for ir_unop_sin.
Kenneth Graunke [Fri, 9 Jul 2010 06:23:23 +0000 (23:23 -0700)]
ir_constant_expression: Add support for ir_unop_floor.
Kenneth Graunke [Fri, 9 Jul 2010 06:22:36 +0000 (23:22 -0700)]
ir_constant_expression: Add support for ir_unop_ceil.
Kenneth Graunke [Fri, 9 Jul 2010 06:21:36 +0000 (23:21 -0700)]
ir_constant_expression: Add support for ir_unop_trunc.
This uses a C99 function.
Kenneth Graunke [Fri, 9 Jul 2010 06:18:09 +0000 (23:18 -0700)]
ir_constant_expression: Add support for ir_unop_log2.
This uses a C99 function.
Kenneth Graunke [Fri, 9 Jul 2010 06:14:32 +0000 (23:14 -0700)]
ir_constant_expression: Add support for ir_unop_exp2.
This uses a C99 function.
Kenneth Graunke [Fri, 9 Jul 2010 06:11:14 +0000 (23:11 -0700)]
ir_constant_expression: Add support for ir_unop_sign.
Kenneth Graunke [Fri, 9 Jul 2010 06:09:48 +0000 (23:09 -0700)]
ir_constant_expression: Remove bogus assert in ir_unop_abs case.
abs is defined for integral types; it's even implemented.
Kenneth Graunke [Wed, 14 Jul 2010 18:54:15 +0000 (11:54 -0700)]
glsl2: Remove ir_program bong hits.
Eric Anholt [Tue, 13 Jul 2010 19:24:39 +0000 (12:24 -0700)]
ir_to_mesa: Add convenience function for opcodes with no src/dst reg.
Most of flow control is like this.
Eric Anholt [Tue, 13 Jul 2010 18:07:16 +0000 (11:07 -0700)]
glsl2: When linking makes a variable not a varying output, make it ir_var_auto.
This almost fixes glsl-unused-varying, except that the used varying
gets assigned to the first varying slot (position).
Eric Anholt [Tue, 13 Jul 2010 16:46:26 +0000 (09:46 -0700)]
ir_to_mesa: Add support for variable array indexing of builtin varyings.
That is to say, gl_TexCoord[i] now works, fixing glsl-texcoord-array
on swrast.
Eric Anholt [Tue, 13 Jul 2010 16:05:28 +0000 (09:05 -0700)]
ir_to_mesa: Add support for array dereferences on the LHS of assignments.
The big change is to delay address reg setup until the instruction
that needs the deref. It was hard to use the deref chain support for
the LHS because it does the copy of the dereffed value to a temporary
(to avoid problems when two src regs are array derefs), so we wouldn't
haev a pointer to actual storage in the end.
Fixes glsl-vs-arrays on swrast.
Ian Romanick [Tue, 13 Jul 2010 16:22:35 +0000 (09:22 -0700)]
glsl2: Remove unnecessary casts of clone return values
Eric Anholt [Tue, 13 Jul 2010 00:57:46 +0000 (17:57 -0700)]
ir_to_mesa: Rely on ir_mat_op_to_vec for matrix multiplication support.
Eric Anholt [Tue, 13 Jul 2010 00:34:17 +0000 (17:34 -0700)]
glsl2: Add matrix multiplication to ir_mat_op_to_vec.
Eric Anholt [Tue, 13 Jul 2010 02:28:07 +0000 (19:28 -0700)]
ir_to_mesa: Emit OPCODE_MAD when we find an ADD of a MUL.
Bug #27914.
Eric Anholt [Tue, 13 Jul 2010 02:50:01 +0000 (19:50 -0700)]
glsl2: Flatten expression that appear as the parameters of ir_call as well.
Eric Anholt [Tue, 13 Jul 2010 02:31:54 +0000 (19:31 -0700)]
glsl2: Flatten expressions that appear as the children of ir_return as well.
Ian Romanick [Tue, 13 Jul 2010 01:48:50 +0000 (18:48 -0700)]
linker: Merge global-scope instructions into main
Find instructions in all shaders that are not contained in a function
(i.e., initializers for global variables). "Move" these instructions
to the top of the main function in the linked shader. As a
side-effect, many global variables will also be copied into the linked
shader.
Ian Romanick [Fri, 9 Jul 2010 22:28:22 +0000 (15:28 -0700)]
linker: Detect the shader that contains "main" during intrastage linking