gallium: add a src_index[] array to draw's vertex_info for mapping post-xform vertex attribs to hw vertex attribs

1 files changed, 6 insertions, 1 deletions

diff --git a/src/mesa/pipe/draw/draw_vertex.h b/src/mesa/pipe/draw/draw_vertex.h
index 8bb328affa..ab0425e106 100644
--- a/src/mesa/pipe/draw/draw_vertex.h
+++ b/src/mesa/pipe/draw/draw_vertex.h
@@ -70,6 +70,7 @@ struct vertex_info
    uint hwfmt[4];      /**< hardware format info for this format */
    enum interp_mode interp_mode[PIPE_MAX_SHADER_OUTPUTS];
    enum attrib_format format[PIPE_MAX_SHADER_OUTPUTS];   /**< FORMAT_x */
+   uint src_index[PIPE_MAX_SHADER_OUTPUTS];
    uint size;          /**< total vertex size in dwords */
 };
 
@@ -77,16 +78,20 @@ struct vertex_info
 
 /**
  * Add another attribute to the given vertex_info object.
+ * \param src_index  indicates which post-transformed vertex attrib slot
+ *                   corresponds to this attribute.
  * \return slot in which the attribute was added
  */
 static INLINE uint
 draw_emit_vertex_attr(struct vertex_info *vinfo,
-                      enum attrib_format format, enum interp_mode interp)
+                      enum attrib_format format, enum interp_mode interp,
+                      uint src_index)
 {
    const uint n = vinfo->num_attribs;
    assert(n < PIPE_MAX_SHADER_OUTPUTS);
    vinfo->format[n] = format;
    vinfo->interp_mode[n] = interp;
+   vinfo->src_index[n] = src_index;
    vinfo->num_attribs++;
    return n;
 }