+ struct pipe_vertex_buffer vb = {0};
+ struct st_util_vertex *verts;
+
+ vb.stride = sizeof(struct st_util_vertex);
+
+ u_upload_alloc(st->pipe->stream_uploader, 0,
+ 4 * sizeof(struct st_util_vertex), 4,
+ &vb.buffer_offset, &vb.buffer.resource, (void **) &verts);
+ if (!vb.buffer.resource) {
+ return false;
+ }
+
+ /* lower-left */
+ verts[0].x = x0;
+ verts[0].y = y1;
+ verts[0].z = z;
+ verts[0].r = color[0];
+ verts[0].g = color[1];
+ verts[0].b = color[2];
+ verts[0].a = color[3];
+ verts[0].s = s0;
+ verts[0].t = t0;
+
+ /* lower-right */
+ verts[1].x = x1;
+ verts[1].y = y1;
+ verts[1].z = z;
+ verts[1].r = color[0];
+ verts[1].g = color[1];
+ verts[1].b = color[2];
+ verts[1].a = color[3];
+ verts[1].s = s1;
+ verts[1].t = t0;
+
+ /* upper-right */
+ verts[2].x = x1;
+ verts[2].y = y0;
+ verts[2].z = z;
+ verts[2].r = color[0];
+ verts[2].g = color[1];
+ verts[2].b = color[2];
+ verts[2].a = color[3];
+ verts[2].s = s1;
+ verts[2].t = t1;
+
+ /* upper-left */
+ verts[3].x = x0;
+ verts[3].y = y0;
+ verts[3].z = z;
+ verts[3].r = color[0];
+ verts[3].g = color[1];
+ verts[3].b = color[2];
+ verts[3].a = color[3];
+ verts[3].s = s0;
+ verts[3].t = t1;
+
+ u_upload_unmap(st->pipe->stream_uploader);
+
+ cso_set_vertex_buffers(st->cso_context, 0, 1, &vb);
+
+ if (num_instances > 1) {
+ cso_draw_arrays_instanced(st->cso_context, PIPE_PRIM_TRIANGLE_FAN, 0, 4,
+ 0, num_instances);
+ } else {
+ cso_draw_arrays(st->cso_context, PIPE_PRIM_TRIANGLE_FAN, 0, 4);
+ }
+
+ pipe_resource_reference(&vb.buffer.resource, NULL);
+
+ return true;