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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include "graphics/blit.h"
#include "graphics/surface.h"
#include "backends/platform/atari/dlmalloc.h"
#include <cstdlib> // malloc
#include <cstring> // memcpy, memset
#include <mint/cookie.h>
#include "backends/graphics/atari/atari-graphics-superblitter.h"
#include "common/textconsole.h" // error
// bits 26:0
#define SV_BLITTER_SRC1 ((volatile long*)0x80010058)
#define SV_BLITTER_SRC2 ((volatile long*)0x8001005C)
#define SV_BLITTER_DST ((volatile long*)0x80010060)
// The amount of bytes that are to be copied in a horizontal line, minus 1
#define SV_BLITTER_COUNT ((volatile long*)0x80010064)
// The amount of bytes that are to be added to the line start address after a line has been copied, in order to reach the next one
#define SV_BLITTER_SRC1_OFFSET ((volatile long*)0x80010068)
#define SV_BLITTER_SRC2_OFFSET ((volatile long*)0x8001006C)
#define SV_BLITTER_DST_OFFSET ((volatile long*)0x80010070)
// bits 11:0 - The amount of horizontal lines to do
#define SV_BLITTER_MASK_AND_LINES ((volatile long*)0x80010074)
// bit 0 - busy / start
// bits 4:1 - blit mode
#define SV_BLITTER_CONTROL ((volatile long*)0x80010078)
// bit 0 - empty (read only)
// bit 1 - full (read only)
// bits 31:0 - data (write only)
#define SV_BLITTER_FIFO ((volatile long*)0x80010080)
#ifdef USE_SV_BLITTER
static bool isSuperBlitterLocked;
static void syncSuperBlitter() {
// if externally locked, let the owner decide when to sync (unlock)
if (isSuperBlitterLocked)
return;
// while FIFO not empty...
if (superVidelFwVersion >= 9)
while (!(*SV_BLITTER_FIFO & 1));
// while busy blitting...
while (*SV_BLITTER_CONTROL & 1);
}
#endif
void lockSuperBlitter() {
#ifdef USE_SV_BLITTER
assert(!isSuperBlitterLocked);
isSuperBlitterLocked = true;
#endif
}
void unlockSuperBlitter() {
#ifdef USE_SV_BLITTER
assert(isSuperBlitterLocked);
isSuperBlitterLocked = false;
if (hasSuperVidel())
syncSuperBlitter();
#endif
}
// see atari-graphics.cpp
extern bool g_unalignedPitch;
extern mspace g_mspace;
namespace Graphics {
constexpr size_t ALIGN = 16; // 16 bytes
// hijack surface overrides here as well as these are tightly related
// to the blitting routine below
void Surface::create(int16 width, int16 height, const PixelFormat &f) {
assert(width >= 0 && height >= 0);
free();
w = width;
h = height;
format = f;
// align pitch to a 16-byte boundary for a possible C2P conversion
pitch = g_unalignedPitch
? w * format.bytesPerPixel
: (w * format.bytesPerPixel + ALIGN - 1) & (-ALIGN);
if (width && height) {
#ifdef USE_SV_BLITTER
if (g_mspace) {
pixels = mspace_calloc(g_mspace, height * pitch, f.bytesPerPixel);
if (!pixels)
error("Not enough memory to allocate a surface");
else if (pixels <= (void *)0xA0000000)
warning("SuperVidel surface allocated in regular memory");
} else {
#else
{
#endif
pixels = ::calloc(height * pitch, f.bytesPerPixel);
if (!pixels)
error("Not enough memory to allocate a surface");
else
assert(((uintptr)pixels & (ALIGN - 1)) == 0);
}
}
}
void Surface::free() {
#ifdef USE_SV_BLITTER
if (g_mspace)
mspace_free(g_mspace, pixels);
else
#endif
if (pixels)
::free(pixels);
pixels = nullptr;
w = h = pitch = 0;
format = PixelFormat();
}
// Function to blit a rect (version optimized for Atari Falcon with SuperVidel's SuperBlitter)
void copyBlit(byte *dst, const byte *src,
const uint dstPitch, const uint srcPitch,
const uint w, const uint h,
const uint bytesPerPixel) {
if (dst == src)
return;
#ifdef USE_SV_BLITTER
if (((uintptr)src & 0xFF000000) >= 0xA0000000 && ((uintptr)dst & 0xFF000000) >= 0xA0000000) {
if (superVidelFwVersion >= 9) {
*SV_BLITTER_FIFO = (long)src; // SV_BLITTER_SRC1
*SV_BLITTER_FIFO = 0x00000000; // SV_BLITTER_SRC2
*SV_BLITTER_FIFO = (long)dst; // SV_BLITTER_DST
*SV_BLITTER_FIFO = w * bytesPerPixel - 1; // SV_BLITTER_COUNT
*SV_BLITTER_FIFO = srcPitch; // SV_BLITTER_SRC1_OFFSET
*SV_BLITTER_FIFO = 0x00000000; // SV_BLITTER_SRC2_OFFSET
*SV_BLITTER_FIFO = dstPitch; // SV_BLITTER_DST_OFFSET
*SV_BLITTER_FIFO = h; // SV_BLITTER_MASK_AND_LINES
*SV_BLITTER_FIFO = 0x01; // SV_BLITTER_CONTROL
} else {
// make sure the blitter is idle
while (*SV_BLITTER_CONTROL & 1);
*SV_BLITTER_SRC1 = (long)src;
*SV_BLITTER_SRC2 = 0x00000000;
*SV_BLITTER_DST = (long)dst;
*SV_BLITTER_COUNT = w * bytesPerPixel - 1;
*SV_BLITTER_SRC1_OFFSET = srcPitch;
*SV_BLITTER_SRC2_OFFSET = 0x00000000;
*SV_BLITTER_DST_OFFSET = dstPitch;
*SV_BLITTER_MASK_AND_LINES = h;
*SV_BLITTER_CONTROL = 0x01;
}
syncSuperBlitter();
} else
#endif
if (dstPitch == srcPitch && dstPitch == (w * bytesPerPixel)) {
memcpy(dst, src, dstPitch * h);
} else {
for (uint i = 0; i < h; ++i) {
memcpy(dst, src, w * bytesPerPixel);
dst += dstPitch;
src += srcPitch;
}
}
}
} // End of namespace Graphics
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