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/**************************************************************************
*
* 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/draw/draw_private.h"
#include "pipe/draw/draw_vertex.h"
static INLINE void
emit_vertex_attr(struct vertex_info *vinfo,
enum attrib_format format, enum interp_mode interp)
{
const uint n = vinfo->num_attribs;
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);
}
}
assert(vinfo->size * 4 <= MAX_VERTEX_SIZE);
}
/**
* Tell the drawing module about the contents of post-transformation vertices.
* Note that the vertex attribute format info isn't used by 'draw'; all
* attributes are handled as float[4]. But when the driver emits vertices
* it'll use that info.
* We _do_ care about the number of attributes and their interpolation modes.
*/
void
draw_set_vertex_info( struct draw_context *draw,
const struct vertex_info *info)
{
assert(info->interp_mode[0] == INTERP_LINEAR); /* should be vert pos */
assert(info->num_attribs <= PIPE_MAX_SHADER_OUTPUTS);
/* Note that draw-module vertices will consist of the attributes passed
* to this function, plus a header/prefix containing the vertex header
* flags and GLfloat[4] clip pos.
*/
memcpy(&draw->vertex_info, info, sizeof(*info));
draw_compute_vertex_size(&draw->vertex_info);
/* Need to know vertex size (in words) for vertex copying elsewhere.
* Four words per attribute, plus vertex header (uint) and clip
* position (float[4]).
*/
draw->vertex_info.size = draw->vertex_info.num_attribs * 4 + 5;
}
/**
* 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;
}
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