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>

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;
 

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 vertex arrays have vertex buffer associated. */
+   GLbitfield64 VertexAttribBufferMask;
+
    /** Mask of VERT_BIT_* values indicating which arrays are enabled */
    GLbitfield64 _Enabled;
 

src/mesa/main/varray.c

@@ -135,6 +135,11 @@ vertex_attrib_binding(struct gl_context *ctx,
 {
    struct gl_vertex_attrib_array *array = &vao->VertexAttrib[attribIndex];
 
+   if (!_mesa_is_bufferobj(vao->VertexBinding[bindingIndex].BufferObj))
+     vao->VertexAttribBufferMask &= ~VERT_BIT(attribIndex);
+   else
+     vao->VertexAttribBufferMask |= VERT_BIT(attribIndex);
+
    if (array->VertexBinding != bindingIndex) {
       const GLbitfield64 array_bit = VERT_BIT(attribIndex);
 
@@ -174,6 +179,11 @@ _mesa_bind_vertex_buffer(struct gl_context *ctx,
       binding->Offset = offset;
       binding->Stride = stride;
 
+      if (!_mesa_is_bufferobj(vbo))
+         vao->VertexAttribBufferMask &= ~binding->_BoundArrays;
+      else
+         vao->VertexAttribBufferMask |= binding->_BoundArrays;
+
       vao->NewArrays |= binding->_BoundArrays;
    }
 }