[Mesa-dev] [PATCH 07/20] tgsi/scan: record if a shader writes the position output

[Marek Olšák]

From: Marek Olšák <marek.olsak at amd.com>

---
 src/gallium/auxiliary/tgsi/tgsi_scan.c | 2 ++
 src/gallium/auxiliary/tgsi/tgsi_scan.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.c b/src/gallium/auxiliary/tgsi/tgsi_scan.c
index f0dba0b..84d6456 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.c
@@ -568,20 +568,22 @@ scan_declaration(struct tgsi_shader_info *info,
             break;
          case TGSI_SEMANTIC_SAMPLEMASK:
             info->writes_samplemask = true;
             break;
          case TGSI_SEMANTIC_EDGEFLAG:
             info->writes_edgeflag = true;
             break;
          case TGSI_SEMANTIC_POSITION:
             if (procType == PIPE_SHADER_FRAGMENT)
                info->writes_z = true;
+            else
+               info->writes_position = true;
             break;
          }
          break;
 
       case TGSI_FILE_SAMPLER:
          STATIC_ASSERT(sizeof(info->samplers_declared) * 8 >= PIPE_MAX_SAMPLERS);
          info->samplers_declared |= 1u << reg;
          break;
 
       case TGSI_FILE_SAMPLER_VIEW:
diff --git a/src/gallium/auxiliary/tgsi/tgsi_scan.h b/src/gallium/auxiliary/tgsi/tgsi_scan.h
index 602a870..fe503e8 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_scan.h
+++ b/src/gallium/auxiliary/tgsi/tgsi_scan.h
@@ -103,20 +103,21 @@ struct tgsi_shader_info
    boolean uses_linear_opcode_interp_centroid;
    boolean uses_linear_opcode_interp_offset;
    boolean uses_linear_opcode_interp_sample;
    boolean uses_instanceid;
    boolean uses_vertexid;
    boolean uses_vertexid_nobase;
    boolean uses_basevertex;
    boolean uses_primid;
    boolean uses_frontface;
    boolean uses_invocationid;
+   boolean writes_position;
    boolean writes_psize;
    boolean writes_clipvertex;
    boolean writes_viewport_index;
    boolean writes_layer;
    boolean writes_memory; /**< contains stores or atomics to buffers or images */
    boolean is_msaa_sampler[PIPE_MAX_SAMPLERS];
    boolean uses_doubles; /**< uses any of the double instructions */
    boolean uses_derivatives;
    unsigned clipdist_writemask;
    unsigned culldist_writemask;
-- 
2.7.4