diff options
Diffstat (limited to 'src/mesa/pipe/softpipe/g_prim_twoside.c')
-rw-r--r-- | src/mesa/pipe/softpipe/g_prim_twoside.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/mesa/pipe/softpipe/g_prim_twoside.c b/src/mesa/pipe/softpipe/g_prim_twoside.c new file mode 100644 index 00000000000..334ae2f5378 --- /dev/null +++ b/src/mesa/pipe/softpipe/g_prim_twoside.c @@ -0,0 +1,149 @@ +/************************************************************************** + * + * Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas. + * All Rights Reserved. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sub license, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial portions + * of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS + * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. + * IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR + * ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, + * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE + * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + **************************************************************************/ + +/* Authors: Keith Whitwell <[email protected]> + */ +#include "imports.h" +#include "g_context.h" +#include "g_prim.h" + + +struct twoside_stage { + struct prim_stage stage; + + GLfloat facing; + const GLuint *lookup; +}; + + +static INLINE struct twoside_stage *twoside_stage( struct prim_stage *stage ) +{ + return (struct twoside_stage *)stage; +} + + +static void twoside_begin( struct prim_stage *stage ) +{ + struct twoside_stage *twoside = twoside_stage(stage); + + twoside->facing = (stage->generic->setup.front_winding == WINDING_CW) ? -1 : 1; + + stage->next->begin( stage->next ); +} + + +static INLINE void copy_color( GLuint attr_dst, + GLuint attr_src, + struct vertex_header *v ) +{ + if (attr_dst && attr_src) { + memcpy( v->data[attr_dst], + v->data[attr_src], + sizeof(v->data[0]) ); + } +} + + +static struct vertex_header *copy_bfc( struct twoside_stage *twoside, + const struct vertex_header *v, + GLuint idx ) +{ + struct vertex_header *tmp = dup_vert( &twoside->stage, v, idx ); + + copy_color( twoside->lookup[VF_ATTRIB_COLOR0], + twoside->lookup[VF_ATTRIB_BFC0], + tmp ); + + copy_color( twoside->lookup[VF_ATTRIB_COLOR1], + twoside->lookup[VF_ATTRIB_BFC1], + tmp ); + + return tmp; +} + + +/* Twoside tri: + */ +static void twoside_tri( struct prim_stage *stage, + struct prim_header *header ) +{ + struct twoside_stage *twoside = twoside_stage(stage); + + if (header->det * twoside->facing < 0) { + struct prim_header tmp; + + tmp.det = header->det; + tmp.v[0] = copy_bfc(twoside, header->v[0], 0); + tmp.v[1] = copy_bfc(twoside, header->v[1], 1); + tmp.v[2] = copy_bfc(twoside, header->v[2], 2); + + stage->next->tri( stage->next, &tmp ); + } + else { + stage->next->tri( stage->next, header ); + } +} + + +static void twoside_line( struct prim_stage *stage, + struct prim_header *header ) +{ + stage->next->line( stage->next, header ); +} + + +static void twoside_point( struct prim_stage *stage, + struct prim_header *header ) +{ + stage->next->point( stage->next, header ); +} + +static void twoside_end( struct prim_stage *stage ) +{ + stage->next->end( stage->next ); +} + + + +struct prim_stage *prim_twoside( struct generic_context *generic ) +{ + struct twoside_stage *twoside = CALLOC_STRUCT(twoside_stage); + + prim_alloc_tmps( &twoside->stage, 3 ); + + twoside->stage.generic = generic; + twoside->stage.next = NULL; + twoside->stage.begin = twoside_begin; + twoside->stage.point = twoside_point; + twoside->stage.line = twoside_line; + twoside->stage.tri = twoside_tri; + twoside->stage.end = twoside_end; + + twoside->lookup = generic->vf_attr_to_slot; + + return &twoside->stage; +} |