[Mesa-dev] [PATCH] mesa: error out in indirect draw when vertex bindings mismatch

[Tapani Pälli]

Patch adds additional mask for tracking which vertex buffer bindings
are set. This array can be directly compared to which vertex arrays
are enabled and should match when drawing.

Fixes following CTS tests:

   ES31-CTS.draw_indirect.negative-noVBO-arrays
   ES31-CTS.draw_indirect.negative-noVBO-elements

Signed-off-by: Tapani Pälli <tapani.palli at intel.com>
---
 src/mesa/main/api_validate.c | 13 +++++++++++++
 src/mesa/main/mtypes.h       |  3 +++
 src/mesa/main/varray.c       |  5 +++++
 3 files changed, 21 insertions(+)

diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index a490189..e82e89a 100644
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -710,6 +710,19 @@ valid_draw_indirect(struct gl_context *ctx,
       return GL_FALSE;
    }
 
+   /* From OpenGL ES 3.1 spec. section 10.5:
+    *     "An INVALID_OPERATION error is generated if zero is bound to
+    *     VERTEX_ARRAY_BINDING, DRAW_INDIRECT_BUFFER or to any enabled
+    *     vertex array."
+    *
+    * Here we check that vertex buffer bindings match with enabled
+    * vertex arrays.
+    */
+   if (ctx->Array.VAO->_Enabled != ctx->Array.VAO->VertexBindingMask) {
+      _mesa_error(ctx, GL_INVALID_OPERATION, "%s(No VBO bound)", name);
+      return GL_FALSE;
+   }
+
    if (!_mesa_valid_prim_mode(ctx, mode, name))
       return GL_FALSE;
 
diff --git a/src/mesa/main/mtypes.h b/src/mesa/main/mtypes.h
index 4efdf1e..6c6187f 100644
--- a/src/mesa/main/mtypes.h
+++ b/src/mesa/main/mtypes.h
@@ -1419,6 +1419,9 @@ struct gl_vertex_array_object
    /** Vertex buffer bindings */
    struct gl_vertex_buffer_binding VertexBinding[VERT_ATTRIB_MAX];
 
+   /** Mask indicating which binding points are set. */
+   GLbitfield64 VertexBindingMask;
+
    /** Mask of VERT_BIT_* values indicating which arrays are enabled */
    GLbitfield64 _Enabled;
 
diff --git a/src/mesa/main/varray.c b/src/mesa/main/varray.c
index 887d0c0..0a94c5a 100644
--- a/src/mesa/main/varray.c
+++ b/src/mesa/main/varray.c
@@ -174,6 +174,11 @@ bind_vertex_buffer(struct gl_context *ctx,
       binding->Offset = offset;
       binding->Stride = stride;
 
+      if (vbo == ctx->Shared->NullBufferObj)
+         vao->VertexBindingMask &= ~VERT_BIT(index);
+      else
+         vao->VertexBindingMask |= VERT_BIT(index);
+
       vao->NewArrays |= binding->_BoundArrays;
    }
 }
-- 
2.4.3