Mesa (master): glthread: handle POS vs GENERIC0 aliasing

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Module: Mesa
Branch: master
Commit: 57bf51a97357b0cce293659123a3353d1b726487
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=57bf51a97357b0cce293659123a3353d1b726487

Author: Marek Olšák <marek.olsak at amd.com>
Date:   Mon Mar 23 23:35:58 2020 -0400

glthread: handle POS vs GENERIC0 aliasing

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4314>

---

 src/mesa/main/glthread.h        |  3 ++-
 src/mesa/main/glthread_varray.c | 10 ++++++++--
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/src/mesa/main/glthread.h b/src/mesa/main/glthread.h
index f979e5931d4..35b5f1981be 100644
--- a/src/mesa/main/glthread.h
+++ b/src/mesa/main/glthread.h
@@ -65,7 +65,8 @@ struct glthread_attrib_binding {
 struct glthread_vao {
    GLuint Name;
    GLuint CurrentElementBufferName;
-   GLbitfield Enabled;
+   GLbitfield UserEnabled; /**< Vertex attrib arrays enabled by the user. */
+   GLbitfield Enabled; /**< UserEnabled with POS vs GENERIC0 aliasing resolved. */
    GLbitfield UserPointerMask;
    GLbitfield NonZeroDivisorMask;
 
diff --git a/src/mesa/main/glthread_varray.c b/src/mesa/main/glthread_varray.c
index ac83c7a93cd..ff333af0079 100644
--- a/src/mesa/main/glthread_varray.c
+++ b/src/mesa/main/glthread_varray.c
@@ -50,6 +50,7 @@ _mesa_glthread_reset_vao(struct glthread_vao *vao)
    };
 
    vao->CurrentElementBufferName = 0;
+   vao->UserEnabled = 0;
    vao->Enabled = 0;
    vao->UserPointerMask = 0;
    vao->NonZeroDivisorMask = 0;
@@ -230,9 +231,14 @@ _mesa_glthread_ClientState(struct gl_context *ctx, GLuint *vaobj,
       return;
 
    if (enable)
-      vao->Enabled |= 1u << attrib;
+      vao->UserEnabled |= 1u << attrib;
    else
-      vao->Enabled &= ~(1u << attrib);
+      vao->UserEnabled &= ~(1u << attrib);
+
+   /* The generic0 attribute superseeds the position attribute */
+   vao->Enabled = vao->UserEnabled;
+   if (vao->Enabled & VERT_BIT_GENERIC0)
+      vao->Enabled &= ~VERT_BIT_POS;
 }
 
 void _mesa_glthread_AttribDivisor(struct gl_context *ctx, const GLuint *vaobj,