Another mechanism to create vertices with holes - a new EMIT_PAD style

diff --git a/src/mesa/tnl/t_vertex.c b/src/mesa/tnl/t_vertex.c
index 3729e1cc7d7cedaa61943446581225d95b42739f..dc9ea6184c6b33ab4780dfb0d83bc5e12d3c5497 100644 (file)
--- a/src/mesa/tnl/t_vertex.c
+++ b/src/mesa/tnl/t_vertex.c
@@ -657,7 +657,12 @@ struct {
      extract_4chan_4f_rgba,
      { insert_4chan_4f_rgba_1, insert_4chan_4f_rgba_2, insert_4chan_4f_rgba_3,
        insert_4chan_4f_rgba_4 },
-     4 * sizeof(GLchan) }
+     4 * sizeof(GLchan) },
+
+   { "pad",
+     0,
+     { 0, 0, 0, 0 },
+     0 }
 
 };
      
@@ -958,36 +963,47 @@ GLuint _tnl_install_attrs( GLcontext *ctx, const struct tnl_attr_map *map,
 {
    struct tnl_clipspace *vtx = GET_VERTEX_STATE(ctx);
    int offset = 0;
-   GLuint i;
+   GLuint i, j;
 
    assert(nr < _TNL_ATTRIB_MAX);
    assert(nr == 0 || map[0].attrib == VERT_ATTRIB_POS);
 
-   vtx->attr_count = nr;
    vtx->emit = choose_emit_func;
    vtx->interp = choose_interp_func;
    vtx->copy_pv = choose_copy_pv_func;
    vtx->new_inputs = ~0;
 
-   for (i = 0; i < nr; i++) {
+   for (j = 0, i = 0; i < nr; i++) {
       GLuint format = map[i].format;
-      vtx->attr[i].attrib = map[i].attrib;
-      vtx->attr[i].vp = vp;
-      vtx->attr[i].insert = format_info[format].insert;
-      vtx->attr[i].extract = format_info[format].extract;
-      vtx->attr[i].vertattrsize = format_info[format].attrsize;
+      if (format == EMIT_PAD) {
+        offset += map[i].offset;
 
-      if (unpacked_size) 
-        vtx->attr[i].vertoffset = map[i].offset;
-      else
-        vtx->attr[i].vertoffset = offset;
+/*         fprintf(stderr, "%d: pad %d, offset now %d\n", i,  */
+/*                 map[i].offset, offset);  */
 
-/*       fprintf(stderr, "%d: %s offset %d\n", i, */
-/*           format_info[format].name, vtx->attr[i].vertoffset); */
-
-      offset += format_info[format].attrsize;
+      }
+      else {
+        vtx->attr[j].attrib = map[i].attrib;
+        vtx->attr[j].vp = vp;
+        vtx->attr[j].insert = format_info[format].insert;
+        vtx->attr[j].extract = format_info[format].extract;
+        vtx->attr[j].vertattrsize = format_info[format].attrsize;
+
+        if (unpacked_size) 
+           vtx->attr[j].vertoffset = map[i].offset;
+        else
+           vtx->attr[j].vertoffset = offset;
+        
+/*         fprintf(stderr, "%d: %s offset %d\n", i,  */
+/*                 format_info[format].name, vtx->attr[j].vertoffset);  */
+        
+        offset += format_info[format].attrsize;
+        j++;
+      }
    }
 
+   vtx->attr_count = j;
+
    if (unpacked_size)
       vtx->vertex_size = unpacked_size;
    else

diff --git a/src/mesa/tnl/t_vertex.h b/src/mesa/tnl/t_vertex.h
index 297b6a4cbe945705380359d4842da9fd73f9399d..6c58ca994b3754d05fe07c7908219ebc12490f92 100644 (file)
--- a/src/mesa/tnl/t_vertex.h
+++ b/src/mesa/tnl/t_vertex.h
@@ -51,6 +51,7 @@ enum tnl_attr_format {
    EMIT_4UB_4F_BGRA,           /* for color */
    EMIT_4UB_4F_RGBA,           /* for color */
    EMIT_4CHAN_4F_RGBA,         /* for swrast color */
+   EMIT_PAD,                   /* leave a hole of 'offset' bytes */
    EMIT_MAX
 };