[Mesa-dev] [PATCH] r600: fix isoline tess factor component swapping.

[Dave Airlie]

From: Dave Airlie <airlied at redhat.com>

As per radeonsi, the tess factor components for isolines
are reversed.

Fixes: tests/spec/arb_tessellation_shader/execution/isoline.shader_test
Signed-off-by: Dave Airlie <airlied at redhat.com>
---
 src/gallium/drivers/r600/r600_shader.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index fd0cc78..f4bbb34 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -2885,6 +2885,13 @@ static int r600_emit_tess_factor(struct r600_shader_ctx *ctx)
 		int out_idx = i >= outer_comps ? tessinner_idx : tessouter_idx;
 		int out_comp = i >= outer_comps ? i - outer_comps : i;
 
+		if (ctx->shader->tcs_prim_mode == PIPE_PRIM_LINES) {
+			if (out_comp == 1)
+				out_comp = 0;
+			else if (out_comp == 0)
+				out_comp = 1;
+		}
+
 		r = single_alu_op2(ctx, ALU_OP2_ADD_INT,
 				   treg[i / 2], (2 * (i % 2)),
 				   temp_reg, 0,
-- 
2.9.5