mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-22 18:02:05 +00:00
384 lines
8.9 KiB
C++
384 lines
8.9 KiB
C++
/* 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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#include "dreamweb/dreamweb.h"
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#include "engines/util.h"
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#include "graphics/surface.h"
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namespace DreamGen {
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uint8 *DreamGenContext::workspace() {
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push(es);
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es = data.word(kWorkspace);
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uint8 *result = es.ptr(0, 0);
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es = pop();
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return result;
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}
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void DreamGenContext::multiget() {
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multiget(di, bx, cl, ch);
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}
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void DreamGenContext::multiget(uint16 x, uint16 y, uint8 w, uint8 h) {
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unsigned src = x + y * kScreenwidth;
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unsigned dst = (uint16)si;
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es = ds;
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ds = data.word(kWorkspace);
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if (y + h > 200)
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h = 200 - y;
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if (x + w > 320)
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w = 320 - x;
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//debug(1, "multiget %u,%u %ux%u -> segment: %04x->%04x", x, y, w, h, (uint16)ds, (uint16)es);
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for(unsigned l = 0; l < h; ++l) {
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uint8 *src_p = ds.ptr(src + kScreenwidth * l, w);
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uint8 *dst_p = es.ptr(dst + w * l, w);
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memcpy(dst_p, src_p, w);
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}
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si += w * h;
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di = src + kScreenwidth * h;
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cx = 0;
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}
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void DreamGenContext::multiput() {
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multiput(di, bx, cl, ch);
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}
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void DreamGenContext::multiput(uint16 x, uint16 y, uint8 w, uint8 h) {
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unsigned src = (uint16)si;
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unsigned dst = x + y * kScreenwidth;
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es = data.word(kWorkspace);
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if (y + h > 200)
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h = 200 - y;
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if (x + w > 320)
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w = 320 - x;
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//debug(1, "multiput %ux%u -> segment: %04x->%04x", w, h, (uint16)ds, (uint16)es);
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for(unsigned l = 0; l < h; ++l) {
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uint8 *src_p = ds.ptr(src + w * l, w);
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uint8 *dst_p = es.ptr(dst + kScreenwidth * l, w);
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memcpy(dst_p, src_p, w);
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}
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si += w * h;
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di = dst + kScreenwidth * h;
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cx = 0;
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}
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void DreamGenContext::multidump(uint16 x, uint16 y, uint8 width, uint8 height) {
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ds = data.word(kWorkspace);
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unsigned offset = x + y * kScreenwidth;
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//debug(1, "multidump %ux%u(segment: %04x) -> %d,%d(address: %d)", w, h, (uint16)ds, x, y, offset);
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engine->blit(ds.ptr(offset, width * height), kScreenwidth, x, y, width, height);
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}
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void DreamGenContext::multidump() {
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multidump(di, bx, cl, ch);
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unsigned offset = di + bx * kScreenwidth;
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si = di = offset + ch * kScreenwidth;
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cx = 0;
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}
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void DreamGenContext::worktoscreen() {
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uint size = 320 * 200;
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engine->blit(workspace(), 320, 0, 0, 320, 200);
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di = si = size;
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cx = 0;
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}
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void DreamGenContext::printundermon() {
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engine->printUnderMonitor();
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}
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void DreamGenContext::cls() {
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engine->cls();
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}
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void DreamGenContext::frameoutnm(uint8 *dst, const uint8 *src, uint16 pitch, uint16 width, uint16 height, uint16 x, uint16 y) {
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dst += pitch * y + x;
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for (uint16 j = 0; j < height; ++j) {
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memcpy(dst, src, width);
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dst += pitch;
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src += width;
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}
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}
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void DreamGenContext::frameoutbh(uint8 *dst, const uint8 *src, uint16 pitch, uint16 width, uint16 height, uint16 x, uint16 y) {
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uint16 stride = pitch - width;
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dst += y * pitch + x;
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for (uint16 i = 0; i < height; ++i) {
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for (uint16 j = 0; j < width; ++j) {
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if (*dst == 0xff) {
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*dst = *src;
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}
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++src;
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++dst;
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}
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dst += stride;
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}
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}
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void DreamGenContext::frameoutfx(uint8 *dst, const uint8 *src, uint16 pitch, uint16 width, uint16 height, uint16 x, uint16 y) {
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uint16 stride = pitch - width;
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dst += y * pitch + x;
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dst -= width;
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for (uint16 j = 0; j < height; ++j) {
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for (uint16 i = 0; i < width; ++i) {
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uint8 pixel = src[width - i - 1];
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if (pixel)
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*dst = pixel;
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++dst;
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}
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src += width;
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dst += stride;
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}
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}
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void DreamGenContext::doshake() {
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uint8 &counter = data.byte(kShakecounter);
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_cmp(counter, 48);
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if (flags.z())
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return;
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_add(counter, 1);
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static const int shakeTable[] = {
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0, -2, 3, -2, 0, 2, 4, -1,
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1, -3, 3, 2, 0, -2, 3, -2,
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0, 2, 4, -1, 1, -3, 3, 2,
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0, -2, 3, -2, 0, 2, 4, -1,
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1, -3, 3, 2, 0, -2, 3, -2,
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0, 2, 4, -1, 1, -3, 3, 2,
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0, -2, 3, -2, 0, 2, 4, -1,
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1, -3, 3, 2, 0, -2, 3, -2,
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0, 2, 4, -1, 1, -3, 3, 2,
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0, -2, 3, -2, 0, 2, 4, -1,
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1, -3, 3, 2, 0, -2, 3, -2,
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0, 2, 4, -1, 1, -3, 3, 2,
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0, -2, 3, -2, 0, 2, 4, -1,
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1, -3, 3, 0,
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};
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int offset = shakeTable[counter];
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engine->setShakePos(offset >= 0 ? offset : -offset);
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}
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void DreamGenContext::vsync() {
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push(ax);
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push(bx);
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push(cx);
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push(dx);
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push(si);
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push(di);
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push(es);
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push(ds);
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engine->waitForVSync();
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ds = pop();
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es = pop();
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di = pop();
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si = pop();
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dx = pop();
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cx = pop();
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bx = pop();
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ax = pop();
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}
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void DreamGenContext::setmode() {
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vsync();
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initGraphics(320, 200, false);
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}
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static Common::String getFilename(Context &context) {
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uint16 name_ptr = context.dx;
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Common::String name;
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uint8 c;
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while((c = context.cs.byte(name_ptr++)) != 0)
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name += (char)c;
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return name;
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}
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void DreamGenContext::showpcx() {
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Common::String name = getFilename(*this);
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Common::File pcxFile;
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if (!pcxFile.open(name)) {
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warning("showpcx: Could not open '%s'", name.c_str());
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return;
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}
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uint8 *maingamepal;
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int i, j;
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// Read the 16-color palette into the 'maingamepal' buffer. Note that
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// the color components have to be adjusted from 8 to 6 bits.
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pcxFile.seek(16, SEEK_SET);
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es = data.word(kBuffers);
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maingamepal = es.ptr(kMaingamepal, 768);
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pcxFile.read(maingamepal, 48);
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memset(maingamepal + 48, 0xff, 720);
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for (i = 0; i < 48; i++) {
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maingamepal[i] >>= 2;
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}
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// Decode the image data.
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Graphics::Surface *s = g_system->lockScreen();
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Common::Rect rect(640, 480);
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s->fillRect(rect, 0);
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pcxFile.seek(128, SEEK_SET);
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for (int y = 0; y < 480; y++) {
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byte *dst = (byte *)s->getBasePtr(0, y);
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int decoded = 0;
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while (decoded < 320) {
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byte col = pcxFile.readByte();
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byte len;
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if ((col & 0xc0) == 0xc0) {
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len = col & 0x3f;
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col = pcxFile.readByte();
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} else {
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len = 1;
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}
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// The image uses 16 colors and is stored as four bit
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// planes, one for each bit of the color, least
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// significant bit plane first.
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for (i = 0; i < len; i++) {
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int plane = decoded / 80;
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int pos = decoded % 80;
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for (j = 0; j < 8; j++) {
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byte bit = (col >> (7 - j)) & 1;
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dst[8 * pos + j] |= (bit << plane);
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}
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decoded++;
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}
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}
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}
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g_system->unlockScreen();
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pcxFile.close();
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}
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void DreamGenContext::frameoutv(uint8 *dst, const uint8 *src, uint16 pitch, uint16 width, uint16 height, uint16 x, uint16 y) {
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// NB : These resilience checks were not in the original engine, but did they result in undefined behaviour
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// or was something broken during porting to C++?
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assert(pitch == 320);
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if(x >= 320)
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return;
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if(y >= 200)
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return;
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if(x + width > 320) {
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width = 320 - x;
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}
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if(y + height > 200) {
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height = 200 - y;
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}
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uint16 stride = pitch - width;
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dst += pitch * y + x;
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for (uint16 j = 0; j < height; ++j) {
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for (uint16 i = 0; i < width; ++i) {
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uint8 pixel = *src++;
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if (pixel)
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*dst = pixel;
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++dst;
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}
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dst += stride;
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}
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}
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void DreamGenContext::showframe(const void *frameData, uint16 x, uint16 y, uint16 frameNumber, uint8 effectsFlag, uint8 *width, uint8 *height) {
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const Frame *frame = ((const Frame *)frameData) + frameNumber;
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if ((frame->width == 0) && (frame->height == 0)) {
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*width = 0;
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*height = 0;
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return;
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}
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//notblankshow:
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if ((effectsFlag & 128) == 0) {
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x += frame->x;
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y += frame->y;
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}
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//skipoffsets:
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*width = frame->width;
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*height = frame->height;
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const uint8 *pSrc = ((const uint8 *)frameData) + frame->ptr() + 2080;
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if (effectsFlag) {
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if (effectsFlag & 128) { //centred
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x -= *width / 2;
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y -= *height / 2;
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}
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if (effectsFlag & 64) { //diffdest
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frameoutfx(es.ptr(0, dx * *height), pSrc, dx, *width, *height, x, y);
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return;
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}
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if (effectsFlag & 8) { //printlist
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/*
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push(ax);
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al = x - data.word(kMapadx);
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ah = y - data.word(kMapady);
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//addtoprintlist(); // NB: Commented in the original asm
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ax = pop();
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*/
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}
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if (effectsFlag & 4) { //flippedx
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frameoutfx(workspace(), pSrc, 320, *width, *height, x, y);
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return;
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}
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if (effectsFlag & 2) { //nomask
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frameoutnm(workspace(), pSrc, 320, *width, *height, x, y);
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return;
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}
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if (effectsFlag & 32) {
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frameoutbh(workspace(), pSrc, 320, *width, *height, x, y);
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return;
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}
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}
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//noeffects:
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frameoutv(workspace(), pSrc, 320, *width, *height, x, y);
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return;
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}
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void DreamGenContext::showframe() {
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uint8 width, height;
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showframe(ds.ptr(0, 0), di, bx, ax & 0x1ff, ah & 0xfe, &width, &height);
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cl = width;
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ch = height;
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}
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} /*namespace dreamgen */
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