[gl4java-usergroup] Re : Is it possible to load more than one image into the texture loader at a time

[Alban C. <aco...@mi...>]

>Hello,
>      I'm looking at some of the demo code, but i'm not entirely sure
>how to go from the exert below to loading in and binding the three
>textures i require  in the loadtextures method, do we have to delete >the
>image after we are finished.
>If there is an easier way to load in 3 textures, could someone please
>let me know.
>The loading in part seems to be the most difficult part.
>
>Thanks again,
>             Mark.


Sure, it is possible.
When you load your textures, you are storing them in the array object
texture[].
So basically, what you have to do is repeat the operation for each texture,
binding a different texture slot each time.

Here is some code that should work and generate 3 mipmapped textures :


int[] texture = new int[3]; //Storage for 3 textures
string[] texturePaths = new String[3];
texturePaths[0]="pic/crate.png";
texturePaths[1]="pic/crate2.png";
texturePaths[2]="pic/crate3.png";

init(){

	gl.glGenTextures(3, texture); //initialise the 3 texture slots

	for(int i=0; i<3; i++)
	{
		PngTextureLoader texLoader = new PngTextureLoader(gl,glu);
		texLoader.readTexture(getCodeBase(), texturePaths[i]);
		if(texLoader.isOk()) {
			//there you store the texture in slot i ...
      		gl.glBindTexture(GL_TEXTURE_2D, texture[i]);
			//... and then specify the parameters
			gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER,
gl.GL_LINEAR);
			gl.glTexParameteri(gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER,
gl.GL_LINEAR_MIPMAP_LINEAR);
			glu.gluBuild2DMipmaps(gl.GL_TEXTURE_2D,
					  	  3,
					  	  texLoader.getImageWidth(),
			 			  texLoader.getImageHeight(),
						  texLoader.getGLFormat(),
					  	  gl.GL_UNSIGNED_BYTE,
						  texLoader.getTexture());
	}
}

display(){
	//there you select the texture you want to display
	int index = 0; //or 1 or 2 according to the texture you want to display
	gl.glBindTexture(gl.GL_TEXTURE_2D, texture[index]);

	//code to draw your object goes here
	gl.glBegin();
	//(...)
	gl.glEnd();
}