diff options
| -rw-r--r-- | src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp b/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp index 2002ffd6428..18a44be7370 100644 --- a/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp +++ b/src/mesa/drivers/dri/i965/brw_vec4_gs_visitor.cpp @@ -476,6 +476,19 @@ vec4_gs_visitor::visit(ir_emit_vertex *ir) { this->current_annotation = "emit vertex: safety check"; + /* Haswell and later hardware ignores the "Render Stream Select" bits + * from the 3DSTATE_STREAMOUT packet when the SOL stage is disabled, + * and instead sends all primitives down the pipeline for rasterization. + * If the SOL stage is enabled, "Render Stream Select" is honored and + * primitives bound to non-zero streams are discarded after stream output. + * + * Since the only purpose of primives sent to non-zero streams is to + * be recorded by transform feedback, we can simply discard all geometry + * bound to these streams when transform feedback is disabled. + */ + if (ir->stream_id() > 0 && shader_prog->TransformFeedback.NumVarying == 0) + return; + /* To ensure that we don't output more vertices than the shader specified * using max_vertices, do the logic inside a conditional of the form "if * (vertex_count < MAX)" |