Very slow while drawing to screen

Very slow while drawing to screen

Quintinon

Member #8,554

April 2007

I'm having a weird problem I know I shouldn't be running into with my program ... but I have basically a game engine that displays a character and a screen full of 32x32 tiles of 'grass'.(These are place holder graphics for the real game ... no point in getting a bunch done when the engine doesn't even work) I can draw the character and move him around fine, but when I start drawing the tiles(even just one row slows it down considerably) it gets HORRIBLE ... I don't understand what could be going wrong here and would like some help.

Main program cpp file.

1#include <allegro.h>
2#include <string>
3#include "MapEngine.h"
4//*************************************************************************
5//Initialization
6 
7BITMAP *buffer;
8bool updateMap;
9BITMAP *Test;
10int x = 0;
11int y = 0;
12int xBoundry = 640;
13int yBoundry = 480;
14//*************************************************************************
15//Timer
16 
17volatile long speed_counter=0;
18void increment_speed_counter()
19{
20    speed_counter++;
21}
22END_OF_FUNCTION(increment_speed_counter);
23 
24//*************************************************************************
25//Engine
26 
27void engine(void)
28{
29    allegro_init();
30    install_keyboard();
31    install_timer(); 
32    install_mouse(); 
33    set_mouse_speed(1,1);
34    set_mouse_range(0,0, xBoundry, yBoundry);
35    install_sound(DIGI_AUTODETECT,MIDI_AUTODETECT,0);
36    LOCK_VARIABLE(speed_counter);
37    LOCK_FUNCTION(increment_speed_counter);
38    install_int_ex(increment_speed_counter, BPS_TO_TIMER(60));
39    set_color_depth(16);
40    if (set_gfx_mode(GFX_AUTODETECT_WINDOWED,640,480,0,0) != 0)
41    {
42        allegro_exit();
43        exit(1);
44    }
45    buffer = create_bitmap(640,480);
46    clear_bitmap(buffer);
47    Test = load_bitmap("Images\\Test.bmp", desktop_palette);
48    loadMap("Test.map");
49    loadTiles();
50}
51//*************************************************************************
52//Program for calling necessary functions
53 
54void program(void)
55{
56    if(key[KEY_LEFT] && x > 0)
57    {
58        x--;
59        updateMap = true;
60    }
61    else if(key[KEY_RIGHT] && x < xBoundry - 16)
62    {
63        x++;
64        updateMap = true;
65    }
66    if(key[KEY_DOWN] && y < yBoundry - 16)
67    {
68        y++;
69        updateMap = true;
70    }
71    else if(key[KEY_UP] && y > 0)
72    {
73        y--;
74        updateMap = true;
75    }
76}
77//*************************************************************************
78//Display
79 
80void display(void)
81{
82    draw_sprite(buffer, drawMap(0,0,0,0), 0, 0);
83    draw_sprite(buffer, Test, x, y);
84    draw_sprite(screen,buffer,0,0);
85    clear_bitmap(buffer);
86}
87 
88//*************************************************************************
89//Main Program
90 
91int main(int argc, char *argv[])
92{
93    engine();
94    
95    while(!key[KEY_ESC])
96    {
97        while(speed_counter>0)
98        {
99            program();
100            speed_counter--;
101        } 
102        if(updateMap)
103        {
104            display();
105            updateMap = false;
106        }
107    }
108    if(key[KEY_ESC])
109    {
110        destroy_bitmap(Test);
111        destroy_bitmap(buffer);
112    }
113    
114    return 0;
115}
116END_OF_MAIN()

Header file for MapEngine.

#ifndef MapEngine_h_included
#define MapEngine_h_included
int loadMap(std::string s);
int loadTiles(void);
BITMAP* drawMap(int x, int y, int a, int b);


#endif

Cpp file for MapEngine

1#include <allegro.h>
2#include <fstream>
3#include <string>
4using namespace std;
5 
6BITMAP *buffer1;
7BITMAP *Tile;
8int length;
9int height;
10int tileX = 0;
11int tileY = 0;
12int map[1000][1000];
13string tiles[1000];
14int xBoundry1 = 640;
15int yBoundry1 = 480;
16 
17int loadMap(string s)
18{
19    ifstream fileIn(("Map\\" + s).c_str());
20    fileIn >> length;
21    fileIn >> height;
22    map[length][height]; // x, y
23    int x = 0;
24    int y = 0;
25    while (x < length - 1)
26    {
27        while (y < height - 1)
28        {
29            fileIn >> map[x][y];
30            y++;
31        }
32        x++;
33        y = 0;
34    }
35    fileIn.close();
36    buffer1 = create_bitmap(640,480);
37    return 0;
38}
39 
40int loadTiles(void) //Sprite number
41{
42    ifstream fileIn("Tiles\\tiles.shl");
43    int y = 0;
44    fileIn >> y;
45    int i = 0;
46    tiles[y];
47    while (i < y)
48    {
49        fileIn >> tiles<i>;
50        tiles<i> = "Tiles\\" + tiles<i>;
51        i++;
52    }
53    fileIn.close();
54    return 0;
55}
56 
57string getTile(int x)
58{
59    string s = tiles[x] + ".bmp";
60    return s;
61}
62 
63BITMAP* drawMap(int x, int y, int a, int b) //x is leftmost tile, y is upper most tile
64                        //(a,b) is start pixil for [x][y]
65{
66    int origA = a, origB = b;
67    clear_bitmap(buffer1);
68    while(a <= xBoundry1 + 32)
69    {
70        while (b <= yBoundry1 + 32)
71        {
72            Tile = load_bitmap(getTile(map[x][y]).c_str(), desktop_palette);
73            draw_sprite(buffer1, Tile, a, b);
74            b += 32;
75        }
76        a += 32;
77        b = origB;
78    }
79    return buffer1;
80}

and for the map file right now I'm using 50x50 of grass, which it should only be displaying around half of that I think.

Trent Gamblin

Member #261

April 2000

Quote:

Tile = load_bitmap(getTile(map[x][y]).c_str(), desktop_palette);
draw_sprite(buffer1, Tile, a, b);

What you should be doing here is drawing tiles from a pre-loaded array (or perhaps a vector if you're using C++) or tilemap. Loading from disk is much slower than loading from memory. So you need a function to load all the tiles into memory at the start of your game or level, storing them in a global array or vector. Then draw them directly.

[edit]

Don't forget to destroy the bitmaps where you're done with them. The code you have now will cause your computer to run out of memory in a hurry.

If eating hotdogs is wrong, I don't wanna be right.

HardTranceFan

Member #7,317

June 2006

because you have Tile = load_bitmap(getTile(map[x][y]).c_str(), desktop_palette); in MapEngine.drawMap

Load the image once in MapEngine.loadMap

[edit]
Damn - beaten.
[/edit]

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Peter Wang

Member #23

April 2000

Note also that desktop_palette is considered read-only. Don't pass it to load_bitmap. Supply your own PALETTE structure to receive the palette.

gnolam

Member #2,030

March 2002

And don't copy your buffer to the screen with draw_sprite() - use blit().

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