Mesa (master): draw/vs: partly fix basevertex/vertex id

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Module: Mesa
Branch: master
Commit: 7f7c9425a870af2bcb8b4c3149810bd1b32b8ddc
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=7f7c9425a870af2bcb8b4c3149810bd1b32b8ddc

Author: Dave Airlie <airlied at redhat.com>
Date:   Mon Mar 25 15:38:18 2019 +1000

draw/vs: partly fix basevertex/vertex id

This gets the basevertex from the draw depending on whether
it's an indexed or non-indexed draw.

We still fail a transform feedback test for vertex id, as
the vertex id actually an index id, and isn't getting translated
properly to a vertex id, suggestions on how/where to fix that welcome.

Reviewed-by: Brian Paul <brianp at vmware.com>

---

 src/gallium/auxiliary/draw/draw_vs_exec.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/src/gallium/auxiliary/draw/draw_vs_exec.c b/src/gallium/auxiliary/draw/draw_vs_exec.c
index 4f11ac7506c..dbd7aa551eb 100644
--- a/src/gallium/auxiliary/draw/draw_vs_exec.c
+++ b/src/gallium/auxiliary/draw/draw_vs_exec.c
@@ -128,18 +128,17 @@ vs_exec_run_linear(struct draw_vertex_shader *shader,
                          input[slot][3]);
          }
 #endif
+	 int basevertex = shader->draw->pt.user.eltSize ? shader->draw->pt.user.eltBias : shader->draw->start_index;
 
          if (shader->info.uses_vertexid) {
             unsigned vid = machine->SysSemanticToIndex[TGSI_SEMANTIC_VERTEXID];
             assert(vid < ARRAY_SIZE(machine->SystemValue));
-            machine->SystemValue[vid].xyzw[0].i[j] = i + j;
-            /* XXX this should include base vertex. Where to get it??? */
+            machine->SystemValue[vid].xyzw[0].i[j] = i + j + basevertex;
          }
          if (shader->info.uses_basevertex) {
             unsigned vid = machine->SysSemanticToIndex[TGSI_SEMANTIC_BASEVERTEX];
             assert(vid < ARRAY_SIZE(machine->SystemValue));
-            machine->SystemValue[vid].xyzw[0].i[j] = 0;
-            /* XXX Where to get it??? */
+            machine->SystemValue[vid].xyzw[0].i[j] = basevertex;
          }
          if (shader->info.uses_vertexid_nobase) {
             unsigned vid = machine->SysSemanticToIndex[TGSI_SEMANTIC_VERTEXID_NOBASE];