mesa: error out in indirect draw when vertex bindings mismatch

Patch adds additional mask for tracking which vertex arrays have
associated vertex buffer binding 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

v2: update mask in vertex_array_attrib_binding
v3: rename mask and make it track _BoundArrays which matches what
    was actually originally wanted (Fredrik Höglund)
v4: code cleanup, check for GLES 3.1 (Fredrik Höglund)

Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Fredrik Höglund <fredrik@kde.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/src/mesa/main/api_validate.c b/src/mesa/main/api_validate.c
index a490189..d0b3ae7 100644
--- a/src/mesa/main/api_validate.c
+++ b/src/mesa/main/api_validate.c
@@ -710,6 +710,20 @@ 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 for each enabled vertex array we have a vertex
+    * buffer bound.
+    */
+   if (_mesa_is_gles31(ctx) &&
+       ctx->Array.VAO->_Enabled != ctx->Array.VAO->VertexAttribBufferMask) {
+      _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;