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nir: Introduce nir_intrinsic_discard_if.

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This is a conditional discard, which takes a boolean source.

Note that we don't generate ir_discard::condition today, so this
shouldn't break drivers (since none implement this intrinsic yet).

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This commit is contained in:
Kenneth Graunke
2015-02-23 23:47:00 -08:00
parent 23d42b46e3
commit 8e62bd52f8
2 changed files with 10 additions and 2 deletions
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10
src/glsl/nir/glsl_to_nir.cpp
View File

@@ -563,8 +563,14 @@ nir_visitor::visit(ir_discard *ir)
* discards will be immediately followed by a return.
*/
nir_intrinsic_instr *discard =
nir_intrinsic_instr_create(this->shader, nir_intrinsic_discard);
nir_intrinsic_instr *discard;
if (ir->condition) {
discard = nir_intrinsic_instr_create(this->shader,
nir_intrinsic_discard_if);
discard->src[0] = evaluate_rvalue(ir->condition);
} else {
discard = nir_intrinsic_instr_create(this->shader, nir_intrinsic_discard);
}
nir_instr_insert_after_cf_list(this->cf_node_list, &discard->instr);
}

2
src/glsl/nir/nir_intrinsics.h
View File

@@ -68,6 +68,8 @@ INTRINSIC(interp_var_at_offset, 1, ARR(2), true, 0, 1, 0,
#define BARRIER(name) INTRINSIC(name, 0, ARR(), false, 0, 0, 0, 0)
BARRIER(discard)
/** A conditional discard, with a single boolean source. */
INTRINSIC(discard_if, 1, ARR(1), false, 0, 0, 0, 0)
INTRINSIC(emit_vertex, 0, ARR(), false, 0, 0, 1, 0)
INTRINSIC(end_primitive, 0, ARR(), false, 0, 0, 1, 0)