diff options
Diffstat (limited to 'src/mesa/tnl_dd')
| -rw-r--r-- | src/mesa/tnl_dd/t_dd_tritmp.h | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/src/mesa/tnl_dd/t_dd_tritmp.h b/src/mesa/tnl_dd/t_dd_tritmp.h index 5b17a6f6f0..bc1617eae3 100644 --- a/src/mesa/tnl_dd/t_dd_tritmp.h +++ b/src/mesa/tnl_dd/t_dd_tritmp.h @@ -49,7 +49,8 @@ * VERT_X(v): Alias for vertex x value. * VERT_Y(v): Alias for vertex y value. * VERT_Z(v): Alias for vertex z value. - * DEPTH_SCALE: Scale for offset. + * DEPTH_SCALE: Scale for constant offset. + * REVERSE_DEPTH: Viewport depth range reversed. * * VERTEX: Hardware vertex type. * GET_VERTEX(n): Retreive vertex with index n. @@ -108,6 +109,10 @@ #define VERT_Z_ADD(v,val) VERT_Z(v) += val #endif +#ifndef REVERSE_DEPTH +#define REVERSE_DEPTH 0 +#endif + /* disable twostencil for un-aware drivers */ #ifndef HAVE_STENCIL_TWOSIDE #define HAVE_STENCIL_TWOSIDE 0 @@ -269,7 +274,7 @@ static void TAG(triangle)( GLcontext *ctx, GLuint e0, GLuint e1, GLuint e2 ) if ( bc < 0.0f ) bc = -bc; offset += MAX2( ac, bc ) * ctx->Polygon.OffsetFactor; } - offset *= ctx->MRD; + offset *= REVERSE_DEPTH ? -ctx->MRD : ctx->MRD; } } @@ -545,7 +550,7 @@ static void TAG(quad)( GLcontext *ctx, if ( bc < 0.0f ) bc = -bc; offset += MAX2( ac, bc ) * ctx->Polygon.OffsetFactor; } - offset *= ctx->MRD; + offset *= REVERSE_DEPTH ? -ctx->MRD : ctx->MRD; } } |