diff options
Diffstat (limited to 'src/mesa/tnl/t_vb_fog.c')
| -rw-r--r-- | src/mesa/tnl/t_vb_fog.c | 16 |
1 files changed, 12 insertions, 4 deletions
diff --git a/src/mesa/tnl/t_vb_fog.c b/src/mesa/tnl/t_vb_fog.c index 0cffbbb0d15..79d72e45676 100644 --- a/src/mesa/tnl/t_vb_fog.c +++ b/src/mesa/tnl/t_vb_fog.c @@ -1,4 +1,4 @@ -/* $Id: t_vb_fog.c,v 1.8 2001/03/12 00:48:44 gareth Exp $ */ +/* $Id: t_vb_fog.c,v 1.9 2001/03/19 02:25:37 keithw Exp $ */ /* * Mesa 3-D graphics library @@ -135,12 +135,15 @@ static GLboolean run_fog_stage( GLcontext *ctx, struct fog_stage_data *store = FOG_STAGE_DATA(stage); GLvector1f *input; - VB->FogCoordPtr = &store->fogcoord; - if (stage->changed_inputs == 0) return GL_TRUE; if (ctx->Fog.FogCoordinateSource == GL_FRAGMENT_DEPTH_EXT) { + /* fog computed from Z depth */ + /* source = VB->ObjPtr or VB->EyePtr coords */ + /* dest = VB->FogCoordPtr = fog stage private storage */ + VB->FogCoordPtr = &store->fogcoord; + if (!ctx->_NeedEyeCoords) { GLfloat *m = ctx->ModelView.m; GLfloat plane[4]; @@ -174,8 +177,13 @@ static GLboolean run_fog_stage( GLcontext *ctx, input->stride = VB->EyePtr->stride; input->count = VB->EyePtr->count; } - } else + } else { + /* use glFogCoord() coordinates */ + /* source = VB->FogCoordPtr */ input = VB->FogCoordPtr; + /* dest = fog stage private storage */ + VB->FogCoordPtr = &store->fogcoord; + } make_win_fog_coords( ctx, VB->FogCoordPtr, input ); return GL_TRUE; |