Shadow: Add c2p core
Add Chunky-to-Planar core functionality, to be used by the Atari and Amiga (interleaved) bitplanes code. Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Acked-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
parent
4ee2566c3e
commit
87af9ab7d5
184
miext/shadow/c2p_core.h
Normal file
184
miext/shadow/c2p_core.h
Normal file
|
@ -0,0 +1,184 @@
|
|||
/*
|
||||
* Fast C2P (Chunky-to-Planar) Conversion
|
||||
*
|
||||
* Copyright (C) 2003-2008 Geert Uytterhoeven
|
||||
*
|
||||
* NOTES:
|
||||
* - This code was inspired by Scout's C2P tutorial
|
||||
* - It assumes to run on a big endian system
|
||||
*
|
||||
* Permission to use, copy, modify, distribute, and sell this software and its
|
||||
* documentation for any purpose is hereby granted without fee, provided that
|
||||
* the above copyright notice appear in all copies and that both that
|
||||
* copyright notice and this permission notice appear in supporting
|
||||
* documentation, and that the name of Geert Uytterhoeven not be used in
|
||||
* advertising or publicity pertaining to distribution of the software without
|
||||
* specific, written prior permission. Geert Uytterhoeven makes no
|
||||
* representations about the suitability of this software for any purpose. It
|
||||
* is provided "as is" without express or implied warranty.
|
||||
*
|
||||
* GEERT UYTTERHOEVEN DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
||||
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
|
||||
* EVENT SHALL GEERT UYTTERHOEVEN BE LIABLE FOR ANY SPECIAL, INDIRECT OR
|
||||
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
|
||||
* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
|
||||
* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
||||
* PERFORMANCE OF THIS SOFTWARE.
|
||||
*/
|
||||
|
||||
|
||||
/*
|
||||
* Basic transpose step
|
||||
*/
|
||||
|
||||
static inline void _transp(CARD32 d[], unsigned int i1, unsigned int i2,
|
||||
unsigned int shift, CARD32 mask)
|
||||
{
|
||||
CARD32 t = (d[i1] ^ (d[i2] >> shift)) & mask;
|
||||
|
||||
d[i1] ^= t;
|
||||
d[i2] ^= t << shift;
|
||||
}
|
||||
|
||||
|
||||
extern void c2p_unsupported(void);
|
||||
|
||||
static inline CARD32 get_mask(unsigned int n)
|
||||
{
|
||||
switch (n) {
|
||||
case 1:
|
||||
return 0x55555555;
|
||||
|
||||
case 2:
|
||||
return 0x33333333;
|
||||
|
||||
case 4:
|
||||
return 0x0f0f0f0f;
|
||||
|
||||
case 8:
|
||||
return 0x00ff00ff;
|
||||
|
||||
case 16:
|
||||
return 0x0000ffff;
|
||||
}
|
||||
|
||||
c2p_unsupported();
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Transpose operations on 8 32-bit words
|
||||
*/
|
||||
|
||||
static inline void transp8(CARD32 d[], unsigned int n, unsigned int m)
|
||||
{
|
||||
CARD32 mask = get_mask(n);
|
||||
|
||||
switch (m) {
|
||||
case 1:
|
||||
/* First n x 1 block */
|
||||
_transp(d, 0, 1, n, mask);
|
||||
/* Second n x 1 block */
|
||||
_transp(d, 2, 3, n, mask);
|
||||
/* Third n x 1 block */
|
||||
_transp(d, 4, 5, n, mask);
|
||||
/* Fourth n x 1 block */
|
||||
_transp(d, 6, 7, n, mask);
|
||||
return;
|
||||
|
||||
case 2:
|
||||
/* First n x 2 block */
|
||||
_transp(d, 0, 2, n, mask);
|
||||
_transp(d, 1, 3, n, mask);
|
||||
/* Second n x 2 block */
|
||||
_transp(d, 4, 6, n, mask);
|
||||
_transp(d, 5, 7, n, mask);
|
||||
return;
|
||||
|
||||
case 4:
|
||||
/* Single n x 4 block */
|
||||
_transp(d, 0, 4, n, mask);
|
||||
_transp(d, 1, 5, n, mask);
|
||||
_transp(d, 2, 6, n, mask);
|
||||
_transp(d, 3, 7, n, mask);
|
||||
return;
|
||||
}
|
||||
|
||||
c2p_unsupported();
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Transpose operations on 4 32-bit words
|
||||
*/
|
||||
|
||||
static inline void transp4(CARD32 d[], unsigned int n, unsigned int m)
|
||||
{
|
||||
CARD32 mask = get_mask(n);
|
||||
|
||||
switch (m) {
|
||||
case 1:
|
||||
/* First n x 1 block */
|
||||
_transp(d, 0, 1, n, mask);
|
||||
/* Second n x 1 block */
|
||||
_transp(d, 2, 3, n, mask);
|
||||
return;
|
||||
|
||||
case 2:
|
||||
/* Single n x 2 block */
|
||||
_transp(d, 0, 2, n, mask);
|
||||
_transp(d, 1, 3, n, mask);
|
||||
return;
|
||||
}
|
||||
|
||||
c2p_unsupported();
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Transpose operations on 4 32-bit words (reverse order)
|
||||
*/
|
||||
|
||||
static inline void transp4x(CARD32 d[], unsigned int n, unsigned int m)
|
||||
{
|
||||
CARD32 mask = get_mask(n);
|
||||
|
||||
switch (m) {
|
||||
case 2:
|
||||
/* Single n x 2 block */
|
||||
_transp(d, 2, 0, n, mask);
|
||||
_transp(d, 3, 1, n, mask);
|
||||
return;
|
||||
}
|
||||
|
||||
c2p_unsupported();
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Transpose operations on 2 32-bit words
|
||||
*/
|
||||
|
||||
static inline void transp2(CARD32 d[], unsigned int n)
|
||||
{
|
||||
CARD32 mask = get_mask(n);
|
||||
|
||||
/* Single n x 1 block */
|
||||
_transp(d, 0, 1, n, mask);
|
||||
return;
|
||||
}
|
||||
|
||||
|
||||
/*
|
||||
* Transpose operations on 2 32-bit words (reverse order)
|
||||
*/
|
||||
|
||||
static inline void transp2x(CARD32 d[], unsigned int n)
|
||||
{
|
||||
CARD32 mask = get_mask(n);
|
||||
|
||||
/* Single n x 1 block */
|
||||
_transp(d, 1, 0, n, mask);
|
||||
return;
|
||||
}
|
Loading…
Reference in New Issue
Block a user