diff options
| -rw-r--r-- | src/mesa/tnl/t_vb_fog.c | 29 |
1 files changed, 22 insertions, 7 deletions
diff --git a/src/mesa/tnl/t_vb_fog.c b/src/mesa/tnl/t_vb_fog.c index 5440ff7894d..f6518500d80 100644 --- a/src/mesa/tnl/t_vb_fog.c +++ b/src/mesa/tnl/t_vb_fog.c @@ -114,7 +114,7 @@ compute_fog_blend_factors(GLcontext *ctx, GLvector4f *out, const GLvector4f *in) else d = 1.0F / (ctx->Fog.End - ctx->Fog.Start); for ( i = 0 ; i < n ; i++, STRIDE_F(v, stride)) { - const GLfloat z = FABSF(*v); + const GLfloat z = *v; GLfloat f = (end - z) * d; data[i][0] = CLAMP(f, 0.0F, 1.0F); } @@ -122,14 +122,14 @@ compute_fog_blend_factors(GLcontext *ctx, GLvector4f *out, const GLvector4f *in) case GL_EXP: d = ctx->Fog.Density; for ( i = 0 ; i < n ; i++, STRIDE_F(v,stride)) { - const GLfloat z = FABSF(*v); + const GLfloat z = *v; NEG_EXP( data[i][0], d * z ); } break; case GL_EXP2: d = ctx->Fog.Density*ctx->Fog.Density; for ( i = 0 ; i < n ; i++, STRIDE_F(v, stride)) { - const GLfloat z = FABSF(*v); + const GLfloat z = *v; NEG_EXP( data[i][0], d * z * z ); } break; @@ -153,6 +153,8 @@ run_fog_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage) if (ctx->Fog.FogCoordinateSource == GL_FRAGMENT_DEPTH_EXT) { + GLuint i; + GLfloat *coord; /* Fog is computed from vertex or fragment Z values */ /* source = VB->ObjPtr or VB->EyePtr coords */ /* dest = VB->AttribPtr[_TNL_ATTRIB_FOG] = fog stage private storage */ @@ -168,6 +170,8 @@ run_fog_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage) input = &store->fogcoord; /* NOTE: negate plane here so we get positive fog coords! */ + /* NOTE2: this doesn't always work (tests/fog - all frag depth fog + coords will be negative). */ plane[0] = -m[2]; plane[1] = -m[6]; plane[2] = -m[10]; @@ -180,18 +184,29 @@ run_fog_stage(GLcontext *ctx, struct tnl_pipeline_stage *stage) VB->ObjPtr, plane ); input->count = VB->ObjPtr->count; + + /* make sure coords are really positive + NOTE should avoid going through array twice */ + coord = input->start; + for (i = 0; i < input->count; i++) { + input->data[i][0] = FABSF(*coord); + STRIDE_F(coord, input->stride); + } } else { /* fog coordinates = eye Z coordinates (use ABS later) */ - input = &store->input; + input = &store->fogcoord; if (VB->EyePtr->size < 2) _mesa_vector4f_clean_elem( VB->EyePtr, VB->Count, 2 ); - input->data = (GLfloat (*)[4]) &(VB->EyePtr->data[0][2]); - input->start = VB->EyePtr->start+2; - input->stride = VB->EyePtr->stride; + input->stride = 4 * sizeof(GLfloat); input->count = VB->EyePtr->count; + coord = VB->EyePtr->start; + for (i = 0 ; i < VB->EyePtr->count; i++) { + input->data[i][0] = FABSF(coord[2]); + STRIDE_F(coord, VB->EyePtr->stride); + } } } else { |