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/*
* Copyright 2009 VMware, Inc.
* 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
* on 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
* VMWARE AND/OR THEIR 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.
*/
#include "u_indices.h"
#include "u_indices_priv.h"
static void translate_ubyte_ushort( const void *in,
unsigned nr,
void *out )
{
const ubyte *in_ub = (const ubyte *)in;
ushort *out_us = (ushort *)out;
unsigned i;
for (i = 0; i < nr; i++)
out_us[i] = (ushort) in_ub[i];
}
static void translate_memcpy_ushort( const void *in,
unsigned nr,
void *out )
{
memcpy(out, in, nr*sizeof(short));
}
static void translate_memcpy_uint( const void *in,
unsigned nr,
void *out )
{
memcpy(out, in, nr*sizeof(int));
}
static void generate_linear_ushort( unsigned nr,
void *out )
{
ushort *out_us = (ushort *)out;
unsigned i;
for (i = 0; i < nr; i++)
out_us[i] = (ushort) i;
}
static void generate_linear_uint( unsigned nr,
void *out )
{
unsigned *out_ui = (unsigned *)out;
unsigned i;
for (i = 0; i < nr; i++)
out_ui[i] = i;
}
/**
* Given a primitive type and number of vertices, return the number of vertices
* needed to draw the primitive with fill mode = PIPE_POLYGON_MODE_LINE using
* separate lines (PIPE_PRIM_LINES).
*/
static unsigned nr_lines( unsigned prim,
unsigned nr )
{
switch (prim) {
case PIPE_PRIM_TRIANGLES:
return (nr / 3) * 6;
case PIPE_PRIM_TRIANGLE_STRIP:
return (nr - 2) * 6;
case PIPE_PRIM_TRIANGLE_FAN:
return (nr - 2) * 6;
case PIPE_PRIM_QUADS:
return (nr / 4) * 8;
case PIPE_PRIM_QUAD_STRIP:
return (nr - 2) / 2 * 8;
case PIPE_PRIM_POLYGON:
return 2 * nr; /* a line (two verts) for each polygon edge */
default:
assert(0);
return 0;
}
}
int u_unfilled_translator( unsigned prim,
unsigned in_index_size,
unsigned nr,
unsigned unfilled_mode,
unsigned *out_prim,
unsigned *out_index_size,
unsigned *out_nr,
u_translate_func *out_translate )
{
unsigned in_idx;
unsigned out_idx;
u_unfilled_init();
in_idx = in_size_idx(in_index_size);
*out_index_size = (in_index_size == 4) ? 4 : 2;
out_idx = out_size_idx(*out_index_size);
if (unfilled_mode == PIPE_POLYGON_MODE_POINT)
{
*out_prim = PIPE_PRIM_POINTS;
*out_nr = nr;
switch (in_index_size)
{
case 1:
*out_translate = translate_ubyte_ushort;
return U_TRANSLATE_NORMAL;
case 2:
*out_translate = translate_memcpy_uint;
return U_TRANSLATE_MEMCPY;
case 4:
*out_translate = translate_memcpy_ushort;
return U_TRANSLATE_MEMCPY;
default:
*out_translate = translate_memcpy_uint;
*out_nr = 0;
assert(0);
return U_TRANSLATE_ERROR;
}
}
else {
assert(unfilled_mode == PIPE_POLYGON_MODE_LINE);
*out_prim = PIPE_PRIM_LINES;
*out_translate = translate_line[in_idx][out_idx][prim];
*out_nr = nr_lines( prim, nr );
return U_TRANSLATE_NORMAL;
}
}
/**
* Utility for converting unfilled polygons into points, lines, triangles.
* Few drivers have direct support for OpenGL's glPolygonMode.
* This function helps with converting triangles into points or lines
* when the front and back fill modes are the same. When there's
* different front/back fill modes, that can be handled with the
* 'draw' module.
*/
int u_unfilled_generator( unsigned prim,
unsigned start,
unsigned nr,
unsigned unfilled_mode,
unsigned *out_prim,
unsigned *out_index_size,
unsigned *out_nr,
u_generate_func *out_generate )
{
unsigned out_idx;
u_unfilled_init();
*out_index_size = ((start + nr) > 0xfffe) ? 4 : 2;
out_idx = out_size_idx(*out_index_size);
if (unfilled_mode == PIPE_POLYGON_MODE_POINT) {
if (*out_index_size == 4)
*out_generate = generate_linear_uint;
else
*out_generate = generate_linear_ushort;
*out_prim = PIPE_PRIM_POINTS;
*out_nr = nr;
return U_GENERATE_LINEAR;
}
else {
assert(unfilled_mode == PIPE_POLYGON_MODE_LINE);
*out_prim = PIPE_PRIM_LINES;
*out_generate = generate_line[out_idx][prim];
*out_nr = nr_lines( prim, nr );
return U_GENERATE_REUSABLE;
}
}
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