2 files changed, 2 insertions, 0 deletions
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c b/src/gallium/auxiliary/tgsi/tgsi_scan.c
index 56b422d8e9c..a9aa36be46c 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c
@@ -545,6 +545,7 @@ scan_declaration(struct tgsi_shader_info *info,
       case TGSI_FILE_OUTPUT:
          info->output_semantic_name[reg] = (ubyte) semName;
          info->output_semantic_index[reg] = (ubyte) semIndex;
+         info->output_usagemask[reg] |= fulldecl->Declaration.UsageMask;
          info->num_outputs = MAX2(info->num_outputs, reg + 1);
 
          if (fulldecl->Declaration.UsageMask & TGSI_WRITEMASK_X) {
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.h b/src/gallium/auxiliary/tgsi/tgsi_scan.h
index 0cce0f6babb..4add2f7a7e3 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.h
@@ -54,6 +54,7 @@ struct tgsi_shader_info
    ubyte input_cylindrical_wrap[PIPE_MAX_SHADER_INPUTS];
    ubyte output_semantic_name[PIPE_MAX_SHADER_OUTPUTS]; /**< TGSI_SEMANTIC_x */
    ubyte output_semantic_index[PIPE_MAX_SHADER_OUTPUTS];
+   ubyte output_usagemask[PIPE_MAX_SHADER_OUTPUTS];
    ubyte output_streams[PIPE_MAX_SHADER_OUTPUTS];
 
    ubyte num_system_values;