cpp/openttd-patchpack/source Files · src/bridge.h

Files @ r13257:4c5b8120be59

Branch filter:

Location: cpp/openttd-patchpack/source/src/bridge.h

r13257:4c5b8120be59 2.6 KiB text/x-c Show Annotation Show as Raw Download as Raw

rubidium

(svn r17776) -Codechange: [SDL] make "update the video card"-process asynchronious. Profiling with gprof etc. hasn't shown us that DrawSurfaceToScreen takes a significant amount of CPU; only using TIC/TOC it became apparant that it was a heavy CPU-cycle user or that it was waiting for something.
The benefit of making this function asynchronious ranges from 2%-25% (real time) during fast forward on dual core/hyperthreading-enabled CPUs; 8bpp improvements are, in my test cases, significantly smaller than 32bpp improvements.
On single core non-hyperthreading-enabled CPUs the extra locking/scheduling costs up to 1% extra realtime in fast forward. You can use -v sdl:no_threads to disable threading and undo this loss.
During normal non-fast-forwarded games the benefit/costs are negligable except when the gameloop takes more than about 90% of the time of a tick.
Note that allegro's performance does not improve with this system, likely due to their way of getting data to the video card. It is not implemented for the OS X/Windows video backends, unless (ofcourse) SDL is used there.
Funny is that the performance of the 32bpp(-anim) blitter is, at least in some test cases, significantly faster (more than 10%) than the 8bpp(-optimized) blitter when looking at real time in fast forward on a dual core CPU; it was slower.
The idea comes from a paper/report by Idar Borlaug and Knut Imar Hagen.

/* $Id$ */

/*
 * This file is part of OpenTTD.
 * OpenTTD 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, version 2.
 * OpenTTD 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 OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file bridge.h Header file for bridges */

#ifndef BRIDGE_H
#define BRIDGE_H

#include "gfx_type.h"
#include "direction_type.h"
#include "tile_cmd.h"

/** This enum is related to the definition of bridge pieces,
 * which is used to determine the proper sprite table to use
 * while drawing a given bridge part.
 */
enum BridgePieces {
	BRIDGE_PIECE_NORTH = 0,
	BRIDGE_PIECE_SOUTH,
	BRIDGE_PIECE_INNER_NORTH,
	BRIDGE_PIECE_INNER_SOUTH,
	BRIDGE_PIECE_MIDDLE_ODD,
	BRIDGE_PIECE_MIDDLE_EVEN,
	BRIDGE_PIECE_HEAD,
	BRIDGE_PIECE_INVALID,
};

DECLARE_POSTFIX_INCREMENT(BridgePieces);

enum {
	MAX_BRIDGES = 13
};

typedef uint BridgeType;

/** Struct containing information about a single bridge type
 */
struct BridgeSpec {
	Year avail_year;             ///< the year where it becomes available
	byte min_length;             ///< the minimum length (not counting start and end tile)
	byte max_length;             ///< the maximum length (not counting start and end tile)
	uint16 price;                ///< the price multiplier
	uint16 speed;                ///< maximum travel speed
	SpriteID sprite;             ///< the sprite which is used in the GUI
	SpriteID pal;                ///< the palette which is used in the GUI
	StringID material;           ///< the string that contains the bridge description
	StringID transport_name[2];  ///< description of the bridge, when built for road or rail
	PalSpriteID **sprite_table;  ///< table of sprites for drawing the bridge
	byte flags;                  ///< bit 0 set: disable drawing of far pillars.
};

extern BridgeSpec _bridge[MAX_BRIDGES];

Foundation GetBridgeFoundation(Slope tileh, Axis axis);
bool HasBridgeFlatRamp(Slope tileh, Axis axis);

static inline const BridgeSpec *GetBridgeSpec(BridgeType i)
{
	assert(i < lengthof(_bridge));
	return &_bridge[i];
}

void DrawBridgeMiddle(const TileInfo *ti);

bool CheckBridge_Stuff(BridgeType bridge_type, uint bridge_len, DoCommandFlag flags = DC_NONE);
int CalcBridgeLenCostFactor(int x);

void ResetBridges();

#endif /* BRIDGE_H */