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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_memcpy_ushort( const void *in,
unsigned start,
unsigned in_nr,
unsigned out_nr,
unsigned restart_index,
void *out )
{
memcpy(out, &((short *)in)[start], out_nr*sizeof(short));
}
static void translate_memcpy_uint( const void *in,
unsigned start,
unsigned in_nr,
unsigned out_nr,
unsigned restart_index,
void *out )
{
memcpy(out, &((int *)in)[start], out_nr*sizeof(int));
}
/**
* Translate indexes when a driver can't support certain types
* of drawing. Example include:
* - Translate 1-byte indexes into 2-byte indexes
* - Translate PIPE_PRIM_QUADS into PIPE_PRIM_TRIANGLES when the hardware
* doesn't support the former.
* - Translate from first provoking vertex to last provoking vertex and
* vice versa.
*
* \param hw_mask mask of (1 << PIPE_PRIM_x) flags indicating which types
* of primitives are supported by the hardware.
* \param prim incoming PIPE_PRIM_x
* \param in_index_size bytes per index value (1, 2 or 4)
* \param nr number of incoming vertices
* \param in_pv incoming provoking vertex convention (PV_FIRST or PV_LAST)
* \param out_pv desired provoking vertex convention (PV_FIRST or PV_LAST)
* \param prim_restart whether primitive restart is disable or enabled
* \param out_prim returns new PIPE_PRIM_x we'll translate to
* \param out_index_size returns bytes per new index value (2 or 4)
* \param out_nr returns number of new vertices
* \param out_translate returns the translation function to use by the caller
*/
int u_index_translator( unsigned hw_mask,
unsigned prim,
unsigned in_index_size,
unsigned nr,
unsigned in_pv,
unsigned out_pv,
unsigned prim_restart,
unsigned *out_prim,
unsigned *out_index_size,
unsigned *out_nr,
u_translate_func *out_translate )
{
unsigned in_idx;
unsigned out_idx;
int ret = U_TRANSLATE_NORMAL;
assert(in_index_size == 1 ||
in_index_size == 2 ||
in_index_size == 4);
u_index_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 ((hw_mask & (1<<prim)) &&
in_index_size == *out_index_size &&
in_pv == out_pv)
{
/* Index translation not really needed */
if (in_index_size == 4)
*out_translate = translate_memcpy_uint;
else
*out_translate = translate_memcpy_ushort;
*out_prim = prim;
*out_nr = nr;
return U_TRANSLATE_MEMCPY;
}
else {
switch (prim) {
case PIPE_PRIM_POINTS:
*out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
*out_prim = PIPE_PRIM_POINTS;
*out_nr = nr;
break;
case PIPE_PRIM_LINES:
*out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
*out_prim = PIPE_PRIM_LINES;
*out_nr = nr;
break;
case PIPE_PRIM_LINE_STRIP:
*out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
*out_prim = PIPE_PRIM_LINES;
*out_nr = (nr - 1) * 2;
break;
case PIPE_PRIM_LINE_LOOP:
*out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
*out_prim = PIPE_PRIM_LINES;
*out_nr = nr * 2;
break;
case PIPE_PRIM_TRIANGLES:
*out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = nr;
break;
case PIPE_PRIM_TRIANGLE_STRIP:
*out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = (nr - 2) * 3;
break;
case PIPE_PRIM_TRIANGLE_FAN:
*out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = (nr - 2) * 3;
break;
case PIPE_PRIM_QUADS:
*out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = (nr / 4) * 6;
break;
case PIPE_PRIM_QUAD_STRIP:
*out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = (nr - 2) * 3;
break;
case PIPE_PRIM_POLYGON:
*out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = (nr - 2) * 3;
break;
default:
assert(0);
*out_translate = translate[in_idx][out_idx][in_pv][out_pv][prim_restart][prim];
*out_prim = PIPE_PRIM_POINTS;
*out_nr = nr;
return U_TRANSLATE_ERROR;
}
}
return ret;
}
/**
* If a driver does not support a particular gallium primitive type
* (such as PIPE_PRIM_QUAD_STRIP) this function can be used to help
* convert the primitive into a simpler type (like PIPE_PRIM_TRIANGLES).
*
* The generator functions generates a number of ushort or uint indexes
* for drawing the new type of primitive.
*
* \param hw_mask a bitmask of (1 << PIPE_PRIM_x) values that indicates
* kind of primitives are supported by the driver.
* \param prim the PIPE_PRIM_x that the user wants to draw
* \param start index of first vertex to draw
* \param nr number of vertices to draw
* \param in_pv user's provoking vertex (PV_FIRST/LAST)
* \param out_pv desired proking vertex for the hardware (PV_FIRST/LAST)
* \param out_prim returns the new primitive type for the driver
* \param out_index_size returns OUT_USHORT or OUT_UINT
* \param out_nr returns new number of vertices to draw
* \param out_generate returns pointer to the generator function
*/
int u_index_generator( unsigned hw_mask,
unsigned prim,
unsigned start,
unsigned nr,
unsigned in_pv,
unsigned out_pv,
unsigned *out_prim,
unsigned *out_index_size,
unsigned *out_nr,
u_generate_func *out_generate )
{
unsigned out_idx;
u_index_init();
*out_index_size = ((start + nr) > 0xfffe) ? 4 : 2;
out_idx = out_size_idx(*out_index_size);
if ((hw_mask & (1<<prim)) &&
(in_pv == out_pv)) {
*out_generate = generate[out_idx][in_pv][out_pv][PIPE_PRIM_POINTS];
*out_prim = prim;
*out_nr = nr;
return U_GENERATE_LINEAR;
}
else {
switch (prim) {
case PIPE_PRIM_POINTS:
*out_generate = generate[out_idx][in_pv][out_pv][prim];
*out_prim = PIPE_PRIM_POINTS;
*out_nr = nr;
return U_GENERATE_REUSABLE;
case PIPE_PRIM_LINES:
*out_generate = generate[out_idx][in_pv][out_pv][prim];
*out_prim = PIPE_PRIM_LINES;
*out_nr = nr;
return U_GENERATE_REUSABLE;
case PIPE_PRIM_LINE_STRIP:
*out_generate = generate[out_idx][in_pv][out_pv][prim];
*out_prim = PIPE_PRIM_LINES;
*out_nr = (nr - 1) * 2;
return U_GENERATE_REUSABLE;
case PIPE_PRIM_LINE_LOOP:
*out_generate = generate[out_idx][in_pv][out_pv][prim];
*out_prim = PIPE_PRIM_LINES;
*out_nr = nr * 2;
return U_GENERATE_ONE_OFF;
case PIPE_PRIM_TRIANGLES:
*out_generate = generate[out_idx][in_pv][out_pv][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = nr;
return U_GENERATE_REUSABLE;
case PIPE_PRIM_TRIANGLE_STRIP:
*out_generate = generate[out_idx][in_pv][out_pv][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = (nr - 2) * 3;
return U_GENERATE_REUSABLE;
case PIPE_PRIM_TRIANGLE_FAN:
*out_generate = generate[out_idx][in_pv][out_pv][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = (nr - 2) * 3;
return U_GENERATE_REUSABLE;
case PIPE_PRIM_QUADS:
*out_generate = generate[out_idx][in_pv][out_pv][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = (nr / 4) * 6;
return U_GENERATE_REUSABLE;
case PIPE_PRIM_QUAD_STRIP:
*out_generate = generate[out_idx][in_pv][out_pv][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = (nr - 2) * 3;
return U_GENERATE_REUSABLE;
case PIPE_PRIM_POLYGON:
*out_generate = generate[out_idx][in_pv][out_pv][prim];
*out_prim = PIPE_PRIM_TRIANGLES;
*out_nr = (nr - 2) * 3;
return U_GENERATE_REUSABLE;
default:
assert(0);
*out_generate = generate[out_idx][in_pv][out_pv][PIPE_PRIM_POINTS];
*out_prim = PIPE_PRIM_POINTS;
*out_nr = nr;
return U_TRANSLATE_ERROR;
}
}
}
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