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glsl: Don't allow gl_PerVertex to be redeclared after it's been used.

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Fixes piglit tests:
- spec/glsl-1.50/compiler/gs-redeclares-pervertex-in-after-other-usage.geom
- spec/glsl-1.50/compiler/gs-redeclares-pervertex-out-after-other-usage.geom
- spec/glsl-1.50/compiler/gs-redeclares-pervertex-out-after-usage.geom
- spec/glsl-1.50/compiler/vs-redeclares-pervertex-out-after-other-usage.vert
- spec/glsl-1.50/compiler/vs-redeclares-pervertex-out-after-usage.vert

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
This commit is contained in:
Paul Berry 2013-10-01 15:48:07 -07:00
parent 84b9fa83a0
commit 8cb9cce040
1 changed files with 53 additions and 0 deletions
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53
src/glsl/ast_to_hir.cpp
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@ -4611,6 +4611,39 @@ ast_struct_specifier::hir(exec_list *instructions,
return NULL;
}
/**
* Visitor class which detects whether a given interface block has been used.
*/
class interface_block_usage_visitor : public ir_hierarchical_visitor
{
public:
interface_block_usage_visitor(ir_variable_mode mode, const glsl_type *block)
: mode(mode), block(block), found(false)
{
}
virtual ir_visitor_status visit(ir_dereference_variable *ir)
{
if (ir->var->mode == mode && ir->var->get_interface_type() == block) {
found = true;
return visit_stop;
}
return visit_continue;
}
bool usage_found() const
{
return this->found;
}
private:
ir_variable_mode mode;
const glsl_type *block;
bool found;
};
ir_rvalue *
ast_interface_block::hir(exec_list *instructions,
struct _mesa_glsl_parse_state *state)
@ -4737,6 +4770,26 @@ ast_interface_block::hir(exec_list *instructions,
earlier_per_vertex->fields.structure[j].location;
}
}
/* From section 7.1 ("Built-in Language Variables") of the GLSL 4.10
* spec:
*
* If a built-in interface block is redeclared, it must appear in
* the shader before any use of any member included in the built-in
* declaration, or a compilation error will result.
*
* This appears to be a clarification to the behaviour established for
* gl_PerVertex by GLSL 1.50, therefore we implement this behaviour
* regardless of GLSL version.
*/
interface_block_usage_visitor v(var_mode, earlier_per_vertex);
v.run(instructions);
if (v.usage_found()) {
_mesa_glsl_error(&loc, state,
"redeclaration of a built-in interface block must "
"appear before any use of any member of the "
"interface block");
}
}
const glsl_type *block_type =