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i965: Add support for gl_FrontFacing to the new FS backend. 

Fixes:
glsl1-gl_FrontFacing var (1)
glsl1-gl_FrontFacing var (2)
This commit is contained in:
Eric Anholt 2010-09-28 09:47:37 -07:00
parent ef8e002c75
commit 5f7bd68149
1 changed files with 15 additions and 3 deletions
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18
src/mesa/drivers/dri/i965/brw_fs.cpp
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@ -615,7 +615,21 @@ fs_visitor::visit(ir_variable *ir)
}
if (ir->mode == ir_var_in) {
reg = &this->interp_attrs[ir->location];
if (strcmp(ir->name, "gl_FrontFacing") == 0) {
reg = new(this->mem_ctx) fs_reg(this, ir->type);
struct brw_reg r1_6ud = retype(brw_vec1_grf(1, 6), BRW_REGISTER_TYPE_UD);
/* bit 31 is "primitive is back face", so checking < (1 << 31) gives
* us front face
*/
fs_inst *inst = emit(fs_inst(BRW_OPCODE_CMP,
*reg,
fs_reg(r1_6ud),
fs_reg(1u << 31)));
inst->conditional_mod = BRW_CONDITIONAL_L;
emit(fs_inst(BRW_OPCODE_AND, *reg, *reg, fs_reg(1u)));
} else {
reg = &this->interp_attrs[ir->location];
}
}
if (ir->mode == ir_var_uniform) {
@ -1342,8 +1356,6 @@ fs_visitor::emit_interpolation()
this->pixel_w = fs_reg(this, glsl_type::float_type);
emit(fs_inst(FS_OPCODE_RCP, this->pixel_w, wpos));
/* FINISHME: gl_FrontFacing */
foreach_iter(exec_list_iterator, iter, *this->shader->ir) {
ir_instruction *ir = (ir_instruction *)iter.get();
ir_variable *var = ir->as_variable();