i965: Request lowering gl_VertexID

Fixes the (new) piglit tests gles-3.0-drawarrays-vertexid,
gl-3.0-multidrawarrays-vertexid, and gl-3.2-basevertex-vertexid.

Fixes gles3conform failure in:

ES3-CTS.gtf.GL3Tests.transform_feedback.transform_feedback_vertex_id

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=80247
Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

diff --git a/src/mesa/drivers/dri/i965/brw_context.c b/src/mesa/drivers/dri/i965/brw_context.c
index 216b788a7eec41d07b4656faf633fad03e58f308..619f2d56a57fbee3bd5c618352a3b4dd73b52d66 100644 (file)
--- a/src/mesa/drivers/dri/i965/brw_context.c
+++ b/src/mesa/drivers/dri/i965/brw_context.c
@@ -483,6 +483,7 @@ brw_initialize_context_constants(struct brw_context *brw)
       ctx->Const.QuadsFollowProvokingVertexConvention = false;
 
    ctx->Const.NativeIntegers = true;
+   ctx->Const.VertexID_is_zero_based = true;
 
    /* Regarding the CMP instruction, the Ivybridge PRM says:
     *