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render textures

Started by highendman Feb 6, 2010 at 7:14 AM 7 replies 1.3k views

Original Post

Feb 6, 2010 at 7:14 AM

Hello, I have a class "renderer" that renders all my sprites: It has a std::vector that stores pointers to all textures. You can add a texture with renderer::addTexture(Texture*). In the main loop you call renderer::draw(). But it doesn't work well (actually it doesn't work at all :D).


void Renderer::draw()
{
	for(int i=0; i<gfxList.size(); i++)
	{
		glBindTexture(GL_TEXTURE_2D, gfxList->getData());

    	glBegin( GL_QUADS );
	    	glTexCoord2f(0.0f, 0.0f); glVertex3f(0, 0, 1);    //yes the coordinates are static, but it's just for the moment 
	    	glTexCoord2f(1.0f, 0.0f); glVertex3f(1, 0,  1 );
	    	glTexCoord2f(1.0f, 1.0f); glVertex3f(1, 1, 1 );
	    	glTexCoord2f(0.0f, 1.0f); glVertex3f(0, 1, 1 );
   	 glEnd();
	}
}

Texture::getData() returns the GLuint.


Renderer gameGraphics;

Texture tex;

gameGraphics.addTexture(&tex);

...

gameGraphics.draw();

If I run this code, only the quad is displayed, but the actual texture is missing. I guess everyone is facepalming right now :D Thanks.

TheUnnamable

Feb 6, 2010 at 7:58 AM

Have you tried glEnable(GL_TEXTURE_2D)?

Jason Petrasko

Feb 6, 2010 at 8:26 AM

If it isn't something as simple as TheUnnamable says, then we will need to see the texture class code to see how its working.

highendman

Feb 6, 2010 at 10:56 AM

GL_TEXTURE_2D is enabled.

Texture.h

class Textur{	public:											Textur();										   ~Textur();	private:		ILuint								ILimgData;		GLuint								GLimgData;		std::string							imgPath;	public:		GLuint								getData();		std::string						    getPath();		bool								open(std::string nPath);};

Texture.cpp

Textur::Textur(){	imgPath = "pic.jpg";}Textur::~Textur(){}GLuint Textur::getData(){	return GLimgData;}string Textur::getPath(){	return imgPath;}bool Textur::open(string nPath){	imgPath = nPath;	ilGenImages(1,&ILimgData);				ilBindImage(ILimgData);				if (!ilLoadImage(nPath.c_str()))	{		PRINT("ERROR: Textur kann nicht geladen werden");		ilDeleteImages(1,&ILimgData);			return false;	}			long w, h, bpp, format;	unsigned char *texdata = NULL;	w       =ilGetInteger(IL_IMAGE_WIDTH);		h       =ilGetInteger(IL_IMAGE_HEIGHT);		bpp     =ilGetInteger(IL_IMAGE_BYTES_PER_PIXEL); 	format  =ilGetInteger(IL_IMAGE_FORMAT);		texdata	=ilGetData();	glGenTextures(1,&GLimgData);			glBindTexture(GL_TEXTURE_2D, GLimgData);		glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR);  	gluBuild2DMipmaps(GL_TEXTURE_2D, bpp, w, h, format, GL_UNSIGNED_BYTE, texdata); 	return true;	}

I copied some parts out of different tutorials, so the code might be a bit confusing.

Jason Petrasko

Feb 6, 2010 at 2:38 PM

The examples I've seen use a call "ilConvertImage(IL_RGB, IL_UNSIGNED_BYTE);" to convert the images bytes after being loaded. Not sure if you need that or not.

highendman

Feb 6, 2010 at 2:57 PM

what I forgot to say:
If I display textures "without" the Renderer-Class it works.

main.cpp

Texture tex;...while(isRunning){   ...   glBindTexture(GL_TEXTURE_2D, tex.getData());    glBegin( GL_QUADS );	glTexCoord2f(0.0f, 0.0f); glVertex3f(0, 0, 1);	glTexCoord2f(1.0f, 0.0f); glVertex3f(1, 0,  1 );	glTexCoord2f(1.0f, 1.0f); glVertex3f(1, 1, 1 );	glTexCoord2f(0.0f, 1.0f); glVertex3f(0, 1, 1 );    glEnd();   ...}

Jason Petrasko

Feb 7, 2010 at 6:44 AM

Well you have got me beat now. I'd have to be able to play and compile the whole project to see what is going on. You welcome to PM me if you want me to try and help that way.

AMike

Feb 8, 2010 at 2:34 PM

Do you have some kind of face culling enabled in your renderer drawing code? This could prevent displaying the correct face of the quad.

mrchrismnh

Feb 8, 2010 at 2:44 PM

Write the output of gfxList->getData() to a file every iteration. It may not be doing what you think it is.

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