From 4a938ef7136a89c828ebb16effe1bc5bea08b7d7 Mon Sep 17 00:00:00 2001 From: Brian Paul Date: Mon, 21 Jan 2013 11:32:49 -0700 Subject: [PATCH] draw: add new debug code and comments in clip code template MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit In debug builds, set clipped vertex window coordinates to NaN values to help debugging. Otherwise, we're just leaving the coordinate in clip space and it's invalid to use it later expecting it to be a window coord. Reviewed-by: José Fonseca --- src/gallium/auxiliary/draw/draw_cliptest_tmp.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/src/gallium/auxiliary/draw/draw_cliptest_tmp.h b/src/gallium/auxiliary/draw/draw_cliptest_tmp.h index bff266b..8b2dcda 100644 --- a/src/gallium/auxiliary/draw/draw_cliptest_tmp.h +++ b/src/gallium/auxiliary/draw/draw_cliptest_tmp.h @@ -129,6 +129,10 @@ static boolean TAG(do_cliptest)( struct pt_post_vs *pvs, need_pipeline |= out->clipmask; } + /* + * Transform the vertex position from clip coords to window coords, + * if the vertex is unclipped. + */ if ((flags & DO_VIEWPORT) && mask == 0) { /* divide by w */ @@ -140,6 +144,17 @@ static boolean TAG(do_cliptest)( struct pt_post_vs *pvs, position[2] = position[2] * w * scale[2] + trans[2]; position[3] = w; } +#ifdef DEBUG + /* For debug builds, set the clipped vertex's window coordinate + * to NaN to help catch potential errors later. + */ + else { + position[0] = + position[1] = + position[2] = + position[3] = 0.0f / 0.0f; + } +#endif if ((flags & DO_EDGEFLAG) && ef) { const float *edgeflag = out->data[ef]; -- 2.7.4