From 303895655c6ed837e3d867a450f4322404e86a88 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Mon, 23 Mar 2015 14:47:25 +0200 Subject: [PATCH] i915: Handle provoking vertex in intelFastRenderClippedPoly() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit intelFastRenderClippedPoly() renders the polygon using triangles. For polygons the provoking vertex is always the first one, and currently this function assumes that the provoking vertex for triangles is the last one. In case the user changed the provoking vertex convention, the hardware may be configured to treat the first vertex of triangles as the provoking vertex. So check the convention and emit the triangles in the appropriate order to avoid having to change the hardware provoking vertex convention for rendering polygons. Signed-off-by: Ville Syrjälä Reviewed-by: Ian Romanick --- src/mesa/drivers/dri/i915/intel_tris.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) diff --git a/src/mesa/drivers/dri/i915/intel_tris.c b/src/mesa/drivers/dri/i915/intel_tris.c index 1554613..6133c23 100644 --- a/src/mesa/drivers/dri/i915/intel_tris.c +++ b/src/mesa/drivers/dri/i915/intel_tris.c @@ -928,10 +928,18 @@ intelFastRenderClippedPoly(struct gl_context * ctx, const GLuint * elts, GLuint const GLuint *start = (const GLuint *) V(elts[0]); int i, j; - for (i = 2; i < n; i++) { - COPY_DWORDS(j, vb, vertsize, V(elts[i - 1])); - COPY_DWORDS(j, vb, vertsize, V(elts[i])); - COPY_DWORDS(j, vb, vertsize, start); + if (ctx->Light.ProvokingVertex == GL_LAST_VERTEX_CONVENTION) { + for (i = 2; i < n; i++) { + COPY_DWORDS(j, vb, vertsize, V(elts[i - 1])); + COPY_DWORDS(j, vb, vertsize, V(elts[i])); + COPY_DWORDS(j, vb, vertsize, start); + } + } else { + for (i = 2; i < n; i++) { + COPY_DWORDS(j, vb, vertsize, start); + COPY_DWORDS(j, vb, vertsize, V(elts[i - 1])); + COPY_DWORDS(j, vb, vertsize, V(elts[i])); + } } } -- 2.7.4