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Diffstat (limited to 'src/mesa/pipe/draw/draw_vertex.c')
| -rw-r--r-- | src/mesa/pipe/draw/draw_vertex.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/src/mesa/pipe/draw/draw_vertex.c b/src/mesa/pipe/draw/draw_vertex.c new file mode 100644 index 00000000000..64bc3232077 --- /dev/null +++ b/src/mesa/pipe/draw/draw_vertex.c @@ -0,0 +1,167 @@ +/************************************************************************** + * + * 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. + * + **************************************************************************/ + +/* + * Functions for specifying the post-transformation vertex layout. + * + * Author: + * Brian Paul + * Keith Whitwell + */ + + +#include "pipe/p_defines.h" +#include "pipe/p_context.h" +#include "pipe/p_winsys.h" +#include "pipe/p_util.h" + +#include "pipe/draw/draw_private.h" +#include "pipe/draw/draw_context.h" +#include "pipe/draw/draw_vertex.h" + + +static INLINE void +emit_vertex_attr(struct vertex_info *vinfo, uint vfAttr, uint format, + uint interp) +{ + const uint n = vinfo->num_attribs; + vinfo->attr_mask |= (1 << vfAttr); + vinfo->slot_to_attrib[n] = vfAttr; + if (n >= 2) { + /* the first two slots are the vertex header & clippos */ + assert(vfAttr < Elements(vinfo->attrib_to_slot)); + vinfo->attrib_to_slot[vfAttr] = n - 2; + } + vinfo->interp_mode[n] = interp; + vinfo->format[n] = format; + vinfo->num_attribs++; + +} + + +/** + * Compute the size of a vertex, in dwords/floats, to update the + * vinfo->size field. + */ +void +draw_compute_vertex_size(struct vertex_info *vinfo) +{ + uint i; + + vinfo->size = 0; + for (i = 0; i < vinfo->num_attribs; i++) { + switch (vinfo->format[i]) { + case FORMAT_OMIT: + break; + case FORMAT_4UB: + /* fall-through */ + case FORMAT_1F: + vinfo->size += 1; + break; + case FORMAT_2F: + vinfo->size += 2; + break; + case FORMAT_3F: + vinfo->size += 3; + break; + case FORMAT_4F: + vinfo->size += 4; + break; + default: + assert(0); + } + } +} + + +/** + * Tell the drawing module about the layout of post-transformation vertices + */ +void +draw_set_vertex_attributes( struct draw_context *draw, + const uint *slot_to_vf_attr, + const uint *interp_mode, + unsigned nr_attrs ) +{ + struct vertex_info *vinfo = &draw->vertex_info; + unsigned i; + + assert(slot_to_vf_attr[0] == TGSI_ATTRIB_POS); + + memset(vinfo, 0, sizeof(*vinfo)); + + /* + * First three attribs are always the same: header, clip pos, winpos + */ + emit_vertex_attr(vinfo, TGSI_ATTRIB_VERTEX_HEADER, FORMAT_1F, INTERP_NONE); + emit_vertex_attr(vinfo, TGSI_ATTRIB_CLIP_POS, FORMAT_4F, INTERP_LINEAR); + emit_vertex_attr(vinfo, TGSI_ATTRIB_POS, FORMAT_4F_VIEWPORT, INTERP_LINEAR); + + /* + * Remaining attribs (color, texcoords, etc) + */ + for (i = 1; i < nr_attrs; i++) { + emit_vertex_attr(vinfo, slot_to_vf_attr[i], FORMAT_4F, interp_mode[i]); + } + + draw_compute_vertex_size(vinfo); +} + + +/** + * This function is used to tell the draw module about attributes + * (like colors) that need to be selected based on front/back face + * orientation. + * + * The logic is: + * if (polygon is back-facing) { + * vertex->attrib[front0] = vertex->attrib[back0]; + * vertex->attrib[front1] = vertex->attrib[back1]; + * } + * + * \param front0 first attrib to replace if the polygon is back-facing + * \param back0 first attrib to copy if the polygon is back-facing + * \param front1 second attrib to replace if the polygon is back-facing + * \param back1 second attrib to copy if the polygon is back-facing + * + * Pass -1 to disable two-sided attributes. + */ +void +draw_set_twoside_attributes(struct draw_context *draw, + uint front0, uint back0, + uint front1, uint back1) +{ + /* XXX we could alternately pass an array of front/back attribs if there's + * ever need for more than two. One could imagine a shader extension + * that allows arbitrary attributes to be selected based on polygon + * orientation... + */ + draw->attrib_front0 = front0; + draw->attrib_back0 = back0; + draw->attrib_front1 = front1; + draw->attrib_back1 = back1; +} |