LodePNG Function

closed account (2NywAqkS)
I did post this in the beginners forum but didn't get any response so I will try here.

After many failed attempts of trying to make a function to load PNG textures like:

GLuint Texture_1 = LoadTexture("Texture 1.png");

so that I could them like:
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glEnable( GL_TEXTURE_2D );
	glBindTexture( GL_TEXTURE_2D, Texture_1 );
	glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);

	float X = size/2;
	float O = -size/2;
	glColor3f(1,1,1);
	glBegin(GL_QUADS);
      glTexCoord2d(0.0,0.0); glVertex2d(O,O);
      glTexCoord2d(1.0,0.0); glVertex2d(X,O);
      glTexCoord2d(1.0,1.0); glVertex2d(X,X);
      glTexCoord2d(0.0,1.0); glVertex2d(O,X);
	glEnd();

I came across the LodePNG texture loader. I really have no idea how to use it to make a function like the one I explained above. I vaguely know you decode the png files like this:
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LodePNG_Decoder decoder;
	LodePNG_Decoder_init(&decoder);
	unsigned char* buffer;
	unsigned int* image;
	size_t buffersize, imagesize;

	LodePNG_loadFile(&buffer, &buffersize, filename); /*load the image file with given filename*/

	LodePNG_decode(&decoder, image, &imagesize, buffer, buffersize);

	int width = decoder.infoPng.width; int height = decoder.infoPng.height;

	glGenTextures(1, (GLuint *)&texture);
	glBindTexture(GL_TEXTURE_2D, texture);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, image);


but even this has a few errors. How would I go about loading the png files and making them into textures. If it helps here http://lodev.org/lodepng/ is the LodePNG website. Any help is much appreciated.

Thanks Rowan.
therockon7throw (284)
Hi

You asked about a library, which seems to me that it is not known by most of the people here, how to use it!
Only people who may have had some experiences with the library could help you :-(
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