Kayne Ruse
118 lines
3.7 KiB
C++
118 lines
3.7 KiB
C++
/* Copyright: (c) Kayne Ruse 2013-2015
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely, subject to the following restrictions:
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*
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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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*
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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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*
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* 3. This notice may not be removed or altered from any source
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* distribution.
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*/
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#include "world.hpp"
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#include "channels.hpp"
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#include <sstream>
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//-------------------------
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//static functions
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//-------------------------
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static int regionChecksum(Region* const region) {
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int sum = 0;
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for(int i = 0; i < REGION_WIDTH; i++) {
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for (int j = 0; j < REGION_HEIGHT; j++) {
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for (int k = 0; k < REGION_DEPTH; k++) {
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sum += region->GetTile(i, j, k);
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}
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}
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}
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return sum;
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}
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//-------------------------
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//map management
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//-------------------------
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void World::SendRegionRequest(int roomIndex, int x, int y) {
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RegionPacket packet;
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//pack the region's data
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packet.type = SerialPacketType::REGION_REQUEST;
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packet.roomIndex = roomIndex;
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packet.x = x;
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packet.y = y;
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network.SendTo(Channels::SERVER, &packet);
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}
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void World::hRegionContent(RegionPacket* const argPacket) {
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//checksum
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if (regionChecksum(argPacket->region) == 0) {
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std::ostringstream msg;
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msg << "Received region checksum failed: " << argPacket->x << ", " << argPacket->y;
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throw(std::runtime_error(msg.str()));
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}
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//replace existing regions
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regionPager.UnloadIf([&](Region const& region) -> bool {
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return region.GetX() == argPacket->x && region.GetY() == argPacket->y;
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});
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regionPager.PushRegion(argPacket->region);
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//clean up after the serial code
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delete argPacket->region;
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argPacket->region = nullptr;
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}
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void World::UpdateMap() {
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if (roomIndex == -1) {
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return;
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}
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//these represent the zone of regions that the client needs loaded, including the mandatory buffers (+1/-1)
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int xStart = snapToBase(REGION_WIDTH, camera.x/tileSheet.GetTileW()) - REGION_WIDTH;
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int xEnd = snapToBase(REGION_WIDTH, (camera.x+camera.width)/tileSheet.GetTileW()) + REGION_WIDTH;
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int yStart = snapToBase(REGION_HEIGHT, camera.y/tileSheet.GetTileH()) - REGION_HEIGHT;
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int yEnd = snapToBase(REGION_HEIGHT, (camera.y+camera.height)/tileSheet.GetTileH()) + REGION_HEIGHT;
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//prune distant regions
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regionPager.GetContainer()->remove_if([&](Region const& region) -> bool {
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return region.GetX() < xStart || region.GetX() > xEnd || region.GetY() < yStart || region.GetY() > yEnd;
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});
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//request empty regions within this zone
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for (int i = xStart; i <= xEnd; i += REGION_WIDTH) {
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for (int j = yStart; j <= yEnd; j += REGION_HEIGHT) {
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Region* region = regionPager.FindRegion(i, j);
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if (!region) {
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//request absent region
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SendRegionRequest(roomIndex, i, j);
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}
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else if (regionChecksum(region) == 0) {
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//checksum failed
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//NOTE: this patches bug #45, but does not resolve it
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regionPager.UnloadIf([region](Region const& ref) -> bool {
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//remove the erroneous region
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return region == &ref;
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});
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SendRegionRequest(roomIndex, i, j);
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std::ostringstream msg;
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msg << "Existing region checksum failed: " << roomIndex << ", " << i << ", " << j;
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throw(std::runtime_error(msg.str()));
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}
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}
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}
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} |