mirror of
https://github.com/libretro/scummvm.git
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125 lines
4.0 KiB
C++
125 lines
4.0 KiB
C++
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/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef PSP_MEMORY_H
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#define PSP_MEMORY_H
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#define MIN_AMOUNT_FOR_COMPLEX_COPY 8
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#define MIN_AMOUNT_FOR_MISALIGNED_COPY 8
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//#define __PSP_DEBUG_PRINT__
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//#include "backends/platform/psp/trace.h"
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// These instructions don't generate automatically but are faster then copying byte by byte
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inline void lwl_copy(byte *dst, const byte *src) {
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register uint32 data;
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asm volatile ("lwr %0,0(%1)\n\t"
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"lwl %0,3(%1)\n\t"
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: "=&r" (data) : "r" (src), "m" (*src));
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asm volatile ("swr %1,0(%2)\n\t"
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"swl %1,3(%2)\n\t"
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: "=m" (*dst) : "r" (data), "r" (dst));
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}
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/**
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* Class that does memory copying and swapping if needed
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*/
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class PspMemory {
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private:
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static void testCopy(const byte *debugDst, const byte *debugSrc, uint32 debugBytes);
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static void copy(byte *dst, const byte *src, uint32 bytes);
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static void copy32Aligned(uint32 *dst32, const uint32 *src32, uint32 bytes);
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static void copy32Misaligned(uint32 *dst32, const byte *src, uint32 bytes, uint32 alignSrc);
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static inline void copy8(byte *dst, const byte *src, int32 bytes) {
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//PSP_DEBUG_PRINT("copy8 called with dst[%p], src[%p], bytes[%d]\n", dst, src, bytes);
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uint32 words = bytes >> 2;
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for (; words; words--) {
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lwl_copy(dst, src);
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dst += 4;
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src += 4;
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}
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uint32 bytesLeft = bytes & 0x3;
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for (; bytesLeft; bytesLeft--) {
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*dst++ = *src++;
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}
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}
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public:
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// This is the interface to the outside world
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static void *fastCopy(void *dstv, const void *srcv, int32 bytes) {
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byte *dst = (byte *)dstv;
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byte *src = (byte *)srcv;
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if (bytes < MIN_AMOUNT_FOR_COMPLEX_COPY) {
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copy8(dst, src, bytes);
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} else { // go to more powerful copy
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copy(dst, src, bytes);
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}
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return dstv;
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}
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};
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inline void *psp_memcpy(void *dst, const void *src, int32 bytes) {
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return PspMemory::fastCopy(dst, src, bytes);
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}
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#endif /* PSP_MEMORY_H */
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#if defined(PSP_INCLUDE_SWAP) && !defined(PSP_MEMORY_SWAP_H)
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#define PSP_MEMORY_SWAP_H
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//#include "backends/platform/psp/psppixelformat.h"
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class PspMemorySwap {
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private:
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static void testSwap(const uint16 *debugDst, const uint16 *debugSrc, uint32 debugBytes, PSPPixelFormat &format);
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static void swap(uint16 *dst16, const uint16 *src16, uint32 bytes, PSPPixelFormat &format);
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static void swap32Aligned(uint32 *dst32, const uint32 *src32, uint32 bytes, PSPPixelFormat &format);
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static void swap32Misaligned(uint32 *dst32, const uint16 *src16, uint32 bytes, PSPPixelFormat &format);
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// For swapping, we know that we have multiples of 16 bits
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static void swap16(uint16 *dst16, const uint16 *src16, uint32 bytes, PSPPixelFormat &format) {
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PSP_DEBUG_PRINT("swap16 called with dst16[%p], src16[%p], bytes[%d]\n", dst16, src16, bytes);
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uint32 shorts = bytes >> 1;
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while (shorts--) {
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*dst16++ = format.swapRedBlue16(*src16++);
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}
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}
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public:
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static void fastSwap(byte *dst, const byte *src, uint32 bytes, PSPPixelFormat &format) {
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if (bytes < MIN_AMOUNT_FOR_COMPLEX_COPY * 2) {
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swap16((uint16 *)dst, (uint16 *)src, bytes, format);
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} else { // go to more powerful copy
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swap((uint16 *)dst, (uint16 *)src, bytes, format);
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}
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}
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};
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#endif /* PSP_INCLUDE_SWAP */
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