From: Ilia Mirkin <imirkin@alum.mit.edu>
Date: Wed, 2 Jul 2014 16:16:01 +0000 (-0400)
Subject: r600g: allow vs to write to gl_ViewportIndex
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=313acb3ffa2e73635807c4028b7aedced5bad379;p=mesa.git

r600g: allow vs to write to gl_ViewportIndex

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Tested-by: Tobias Droste <tdroste@gmx.de>
---

diff --git a/src/gallium/drivers/r600/r600_shader.c b/src/gallium/drivers/r600/r600_shader.c
index 3767e5fbc18..448ca8044de 100644
--- a/src/gallium/drivers/r600/r600_shader.c
+++ b/src/gallium/drivers/r600/r600_shader.c
@@ -2042,6 +2042,23 @@ static int r600_shader_from_tgsi(struct r600_context *rctx,
 					output[j].type = V_SQ_CF_ALLOC_EXPORT_WORD0_SQ_EXPORT_POS;
 					pos_emitted = true;
 					break;
+				case TGSI_SEMANTIC_VIEWPORT_INDEX:
+					/* spi_sid is 0 for outputs that are
+					 * not consumed by PS */
+					if (shader->output[i].spi_sid) {
+						output[j].array_base = next_param_base++;
+						output[j].type = V_SQ_CF_ALLOC_EXPORT_WORD0_SQ_EXPORT_PARAM;
+						j++;
+						memcpy(&output[j], &output[j-1], sizeof(struct r600_bytecode_output));
+					}
+					output[j].array_base = 61;
+					output[j].swizzle_x = 7;
+					output[j].swizzle_y = 7;
+					output[j].swizzle_z = 7;
+					output[j].swizzle_w = 0;
+					output[j].type = V_SQ_CF_ALLOC_EXPORT_WORD0_SQ_EXPORT_POS;
+					pos_emitted = true;
+					break;
 				case TGSI_SEMANTIC_CLIPVERTEX:
 					j--;
 					break;