Mesa (master): r600/shader: reserve first register of vertex shader.

[Dave Airlie]

Module: Mesa
Branch: master
Commit: 50330d7115f0d5050ec3cfe6bca2b0136222e097
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=50330d7115f0d5050ec3cfe6bca2b0136222e097

Author: Dave Airlie <airlied at redhat.com>
Date:   Mon Nov 13 13:05:25 2017 +1000

r600/shader: reserve first register of vertex shader.

r0 in input into vertex shaders contains things like vertexid,
we need to reserve it even if we have no inputs.

This fixes a bunch of tessellation piglits.

Cc: <mesa-stable at lists.freedesktop.org>
Signed-off-by: Dave Airlie <airlied at redhat.com>

---

 src/gallium/drivers/r600/r600_shader.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index af866c4bdd..c6e445744e 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -3051,9 +3051,11 @@ static int r600_shader_from_tgsi(struct r600_context *rctx,
 		ctx.file_offset[i] = 0;
 	}
 
-	if (ctx.type == PIPE_SHADER_VERTEX && ctx.info.num_inputs) {
+	if (ctx.type == PIPE_SHADER_VERTEX)  {
+
 		ctx.file_offset[TGSI_FILE_INPUT] = 1;
-		r600_bytecode_add_cfinst(ctx.bc, CF_OP_CALL_FS);
+		if (ctx.info.num_inputs)
+			r600_bytecode_add_cfinst(ctx.bc, CF_OP_CALL_FS);
 	}
 	if (ctx.type == PIPE_SHADER_FRAGMENT) {
 		if (ctx.bc->chip_class >= EVERGREEN)