Mesa (master): freedreno/ir3: fragz cannot be half precision

[Rob Clark]

Module: Mesa
Branch: master
Commit: f805593b129729e516dea30245612b6a49b8505a
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=f805593b129729e516dea30245612b6a49b8505a

Author: Rob Clark <robdclark at gmail.com>
Date:   Tue Jan 31 08:31:37 2017 -0500

freedreno/ir3: fragz cannot be half precision

Signed-off-by: Rob Clark <robdclark at gmail.com>

---

 src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c b/src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c
index 77d8685..bb3f66c 100644
--- a/src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c
+++ b/src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c
@@ -2428,8 +2428,14 @@ ir3_compile_shader_nir(struct ir3_compiler *compiler,
 	if (so->key.half_precision) {
 		for (i = 0; i < ir->noutputs; i++) {
 			struct ir3_instruction *out = ir->outputs[i];
+
 			if (!out)
 				continue;
+
+			/* if frag shader writes z, that needs to be full precision: */
+			if (so->outputs[i/4].slot == FRAG_RESULT_DEPTH)
+				continue;
+
 			out->regs[0]->flags |= IR3_REG_HALF;
 			/* output could be a fanout (ie. texture fetch output)
 			 * in which case we need to propagate the half-reg flag