diff options
| author | Brian <brian@yutani.localnet.net> | 2007-03-10 11:30:19 -0700 |
|---|---|---|
| committer | Brian <brian@yutani.localnet.net> | 2007-03-10 11:30:19 -0700 |
| commit | 10b5895597d5e069183cb647d17eb412effceb4f (patch) | |
| tree | 326f17498a851a18ecbd0e517ad2d64da4cbb8b0 /src/mesa/swrast_setup | |
| parent | 1fcb4ecc07685872c9c42569ba13faa1cad54d3c (diff) | |
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.
Diffstat (limited to 'src/mesa/swrast_setup')
| -rw-r--r-- | src/mesa/swrast_setup/ss_triangle.c | 4 | ||||
| -rw-r--r-- | src/mesa/swrast_setup/ss_tritmp.h | 3 |
2 files changed, 4 insertions, 3 deletions
diff --git a/src/mesa/swrast_setup/ss_triangle.c b/src/mesa/swrast_setup/ss_triangle.c index 09244d9c4b..628e9288e8 100644 --- a/src/mesa/swrast_setup/ss_triangle.c +++ b/src/mesa/swrast_setup/ss_triangle.c @@ -290,8 +290,10 @@ void _swsetup_choose_trifuncs( GLcontext *ctx ) ctx->Polygon.OffsetFill) ind |= SS_OFFSET_BIT; + /* Note: gl_FrontFacing lives in fragment input FOGC.Y at this time */ if ((ctx->Light.Enabled && ctx->Light.Model.TwoSide) || - (ctx->VertexProgram._Enabled && ctx->VertexProgram.TwoSideEnabled)) + (ctx->VertexProgram._Enabled && ctx->VertexProgram.TwoSideEnabled) || + (ctx->FragmentProgram._Current && ctx->FragmentProgram._Current->Base.InputsRead & (1 << FRAG_ATTRIB_FOGC))) ind |= SS_TWOSIDE_BIT; /* We piggyback the two-sided stencil front/back determination on the diff --git a/src/mesa/swrast_setup/ss_tritmp.h b/src/mesa/swrast_setup/ss_tritmp.h index 61c9b2817e..5b14b283f1 100644 --- a/src/mesa/swrast_setup/ss_tritmp.h +++ b/src/mesa/swrast_setup/ss_tritmp.h @@ -55,8 +55,7 @@ static void TAG(triangle)(GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 ) if (IND & (SS_TWOSIDE_BIT | SS_UNFILLED_BIT)) { facing = (cc < 0.0) ^ ctx->Polygon._FrontBit; - if (ctx->Stencil.TestTwoSide) - ctx->_Facing = facing; /* for 2-sided stencil test */ + ctx->_Facing = facing; if (IND & SS_UNFILLED_BIT) mode = facing ? ctx->Polygon.BackMode : ctx->Polygon.FrontMode; |