Jump to content
  • Advertisement
Sign in to follow this  

Building an image from a TMX map

This topic is 2329 days old which is more than the 365 day threshold we allow for new replies. Please post a new topic.

If you intended to correct an error in the post then please contact us.

Recommended Posts

Im trying to display a TMX map image using OpenGL. I have the tile numbers for each tile in a 2D array and trying to draw the map image to an SDL_Surface* which i then convert into an OpenGL texture to render. I don't get any errors when building the image but when I draw it its just black (its not the convertion function, i use it to create several other portions of the game). The map is 60 tiles wide, tiles are 32x32 and the tilesheet is 512x512.

[background=rgb(250, 251, 252)]Can anyone tell me what I'm doing wrong?[/background]

The build image code:

void Map::buildImage(void)
std::cout << "Building Map Image...\n";

SDL_Surface* mapImg = SDL_CreateRGBSurface(SDL_SWSURFACE, 60 * 32, 60 * 32, 32, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000); // Map Image Surface
std::string tilesetfile = "Levels/" + tilesets[0]->filename;
SDL_Surface* tileImg = IMG_Load(tilesetfile.c_str()); // Load TileSet
SDL_Rect tileRect; // TileSet Crop Rect
SDL_Rect mapRect; // Map Destination Rect

std::cout << "\tBuilding Image...\n";

/* Build Map Image */
for(int row = 0; row < 60; row++) // Rows
for(int col = 0; col < 60; col++) // Columns
int id = mapData[row][col]; // Tile ID To Put On Map
int tileCol;
int tileRow;
id--; // So Tile 1 in array is 0 on TileSheet

tileCol = (id % 16); // Get TileSheet Column Position
tileRow = id / 16; // Get TileSheet Row Position
tileRect.x = 32 * tileCol;
tileRect.y = 32 * tileRow;
tileRect.w = 32;
tileRect.h = 32;

mapRect.x = col * 32;
mapRect.y = row * 32;
mapRect.w = 32;
mapRect.h = 32;

if(SDL_BlitSurface(tileImg, &tileRect, mapImg, &mapRect) != 0)
std::cout << "Failed To Blit Map: " << SDL_GetError() << '\n';

image = graphics.convert(mapImg); // Convrt SDL_Surface* to GLuint
std::cout << "Map Image Built!\n";

Share this post

Link to post
Share on other sites
Sign in to follow this  

  • Advertisement

Important Information

By using GameDev.net, you agree to our community Guidelines, Terms of Use, and Privacy Policy.

We are the game development community.

Whether you are an indie, hobbyist, AAA developer, or just trying to learn, GameDev.net is the place for you to learn, share, and connect with the games industry. Learn more About Us or sign up!

Sign me up!