From 10b5895597d5e069183cb647d17eb412effceb4f Mon Sep 17 00:00:00 2001
From: Brian <brian@yutani.localnet.net>
Date: Sat, 10 Mar 2007 11:30:19 -0700
Subject: Implement gl_FrontFacing for fragment shaders.

For the time being, we put the gl_FrontFacing value in the FOGC.Y input
register.  Combining FOGC and FrontFacing in one register is a bit of a
hack and may need to be changed someday.
---
 src/mesa/swrast/s_fragprog.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src/mesa/swrast/s_fragprog.c')

diff --git a/src/mesa/swrast/s_fragprog.c b/src/mesa/swrast/s_fragprog.c
index 698925cdba..dbfc1b8c0c 100644
--- a/src/mesa/swrast/s_fragprog.c
+++ b/src/mesa/swrast/s_fragprog.c
@@ -113,6 +113,10 @@ init_machine(GLcontext *ctx, struct gl_program_machine *machine,
 
    /* Setup pointer to input attributes */
    machine->Attribs = span->array->attribs;
+
+   /* Store front/back facing value in register FOGC.Y */
+   machine->Attribs[FRAG_ATTRIB_FOGC][col][1] = (GLfloat) ctx->_Facing;
+
    machine->CurElement = col;
 
    /* init condition codes */
-- 
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