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nir: Make gl_FrontFacing a system_value 

GLSL IR labels gl_FrontFacing as an input variable and not a system value.
This commit makes NIR silently translate gl_FrontFacing to a system value
so that it properly gets translated into a load_system_value intrinsic.

Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Jason Ekstrand 2015-02-14 12:10:32 -08:00
parent 785b22caee
commit dd110cdfd8
1 changed files with 8 additions and 2 deletions
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10
src/glsl/nir/glsl_to_nir.cpp
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@ -242,6 +242,7 @@ nir_visitor::visit(ir_variable *ir)
var->data.centroid = ir->data.centroid;
var->data.sample = ir->data.sample;
var->data.invariant = ir->data.invariant;
var->data.location = ir->data.location;
switch(ir->data.mode) {
case ir_var_auto:
@ -260,7 +261,13 @@ nir_visitor::visit(ir_variable *ir)
break;
case ir_var_shader_in:
var->data.mode = nir_var_shader_in;
if (ir->data.location == VARYING_SLOT_FACE) {
/* For whatever reason, GLSL IR makes gl_FrontFacing an input */
var->data.location = SYSTEM_VALUE_FRONT_FACE;
var->data.mode = nir_var_system_value;
} else {
var->data.mode = nir_var_shader_in;
}
break;
case ir_var_shader_out:
@ -312,7 +319,6 @@ nir_visitor::visit(ir_variable *ir)
unreachable("not reached");
}
var->data.location = ir->data.location;
var->data.index = ir->data.index;
var->data.binding = ir->data.binding;
/* XXX Get rid of buffer_index */