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Texture binding in DevIL

Started by MindCode Oct 27, 2002 at 9:16 PM 5 replies 2.6k views

Original Post

Oct 27, 2002 at 9:16 PM

Not really an OpenGL question but imagelib.org seems to be down, and I really need some help.


int main(int argc, char *argv[]) {

	ilInit();

	iluInit();

	ilEnable(IL_FILE_OVERWRITE);


	ILuint image[4];

	ilGenImages(4, ℑ[0]);


	ilBindImage(image[0]);

	ilLoadImage("Grass.bmp");

	ilBindImage(image[1]);

	ilLoadImage("Dessert.bmp");

	ilBindImage(image[2]);

	ilLoadImage("Leaves.bmp");

	ilBindImage(image[3]);

	ilLoadImage("Water.bmp");


	ilBindImage(image[0]);


	ilDeleteImages(4, ℑ[0]);


	return 0;
}

This is the EXACT code I compiled. The program stalls. If I remove the second binding of image[0] the program begins and ends without flaw. There''s something about the seconde binding that fucks up the program. Is it a DevIL bug, or am I doing something wrong?

krumms

Oct 27, 2002 at 9:27 PM

Hi there,

it''s been a while since I''ve looked at DevIL, and I don''t know why that would crash it, but you''ve pretty much answered your own question:

why do you ilBindImage( image[0] ) when you''re just going to delete all the images you''ve loaded immediately afterwards? Leave out the second ilBindImage( image[0] ) call. You don''t need it - as you can see from the code, ilDeleteImages takes a pointer to the beginning of the images, so the image doesn''t need to be bound.

That said, it sounds kinda strange that it would stall - perhaps a silly bug in their code. Maybe check the list of bugs for DevIL and if you can''t find anything, get in contact with the developers.

Tom L

Thunder_Hawk

Oct 27, 2002 at 9:33 PM

quote:
Original post by MindCode
imagelib.org seems to be down

It seems fine to me...

zedzeek

164

zedzeek

Oct 27, 2002 at 10:21 PM

been a long time since i used it but IIRC ilBindTexture doesnt actually bind the texture for use with opengl u still have to use glBindTexture( GL_...)

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http://uk.geocities.com/sloppyturds/gotterdammerung.html

MindCode

Author

MindCode

Oct 28, 2002 at 11:40 AM

quote:
Leave out the second ilBindImage( image[0] ) call. You don't need it

Originally there was a plenty of stuff after that, I just cut code away until I determined that was the problem.

Now that imagelib.org is up I'll give it another shot.

Just found out that this works. Go figure ???


int main(int argc, char *argv[]) {

	ilInit();

	iluInit();

	ilEnable(IL_FILE_OVERWRITE);

	ILuint image1,image2,image3,image4;

	image1 = iluGenImage();
	image2 = iluGenImage();
	image3 = iluGenImage();
	image4 = iluGenImage();

	ilBindImage(image1);
	ilLoadImage("Grass.bmp");
	ilBindImage(image2);
	ilLoadImage("Dessert.bmp");
	ilBindImage(image3);
	ilLoadImage("Leaves.bmp");
	ilBindImage(image4);
	ilLoadImage("Water.bmp");

	ilBindImage(image1);

	iluDeleteImage(image1);
	iluDeleteImage(image2);
	iluDeleteImage(image3);
	iluDeleteImage(image4);

	return 0;
}

[edited by - MindCode on October 28, 2002 12:47:01 PM]

MindCode

Author

MindCode

Oct 28, 2002 at 12:39 PM

Here''s what I''m doing. The whole shebang.


void AddAlphaChannel(float fAlpha1, float fAlpha2, float fAlpha3, float fAlpha4) {

	ILint iWidth  = ilGetInteger(IL_IMAGE_WIDTH);
	ILint iHeight = ilGetInteger(IL_IMAGE_HEIGHT);

	ILubyte *pData = ilGetData();

	ILubyte *pAlpha = new ILubyte[iWidth*iHeight*4];

	ILubyte *pBuf = pAlpha;



	float fMinDelta = fAlpha4 - fAlpha1;
	float fMaxDelta = fAlpha3 - fAlpha2;

	float fMinInc = fMinDelta / float(iHeight);
	float fMaxInc = fMaxDelta / float(iHeight);

	float fMin = fAlpha1;
	float fMax = fAlpha2;


	for(int y = 0; y < iHeight; y++) {


		float fDx = fMax - fMin;

		float fInc = fDx / float(iWidth);

		float fAlpha = fMin;

		fMin += fMinInc;
		fMax += fMaxInc;


		for(int x = 0; x < iWidth; x++) {

			float K = fAlpha * 255.f;

			pBuf[0] = pData[2];
			pBuf[1] = pData[1];
			pBuf[2] = pData[0];
			pBuf[3] = ILubyte(K);

			fAlpha += fInc;

			pBuf += 4;
			pData += 3;
	 }
	}


	ilTexImage(iWidth, iHeight, 1, 4, IL_RGBA, IL_UNSIGNED_BYTE, pAlpha);
}


void BlendTextures(ILuint ILimage1, ILuint ILimage2, ILuint ILimage3, ILuint ILimage4) {

	ilBindImage(ILimage1);

	AddAlphaChannel(1.f, 0.f, 0.f, 0.f);

	ilBindImage(ILimage2);

	AddAlphaChannel(0.f, 1.f, 0.f, 0.f);

	ilBindImage(ILimage3);

	AddAlphaChannel(0.f, 0.f, 1.f, 0.f);

	ilBindImage(ILimage4);

	AddAlphaChannel(0.f, 0.f, 0.f, 1.f);


	ILuint ILblend;

	ILblend = iluGenImage();

	ilTexImage(128, 128, 1, 4, IL_RGBA, IL_UNSIGNED_BYTE, NULL);

	ilOverlayImage(ILimage1, 0, 0, 0);
	ilOverlayImage(ILimage2, 0, 0, 0);
	ilOverlayImage(ILimage3, 0, 0, 0);
	ilOverlayImage(ILimage4, 0, 0, 0);

	ilSaveImage("Test.bmp");

	iluDeleteImage(ILblend);
}


int main(int argc, char *argv[]) {

	ilInit();
	iluInit();
	ilEnable(IL_FILE_OVERWRITE);

	ILuint image1,image2,image3,image4;

	image1 = iluGenImage();
	image2 = iluGenImage();
	image3 = iluGenImage();
	image4 = iluGenImage();

	ilBindImage(image1);
	ilLoadImage("Grass.bmp");
	ilBindImage(image2);
	ilLoadImage("Dessert.bmp");
	ilBindImage(image3);
	ilLoadImage("Leaves.bmp");
	ilBindImage(image4);
	ilLoadImage("Water.bmp");

	BlendTextures(image1,image2,image3,image4);

	iluDeleteImage(image1);
	iluDeleteImage(image2);
	iluDeleteImage(image3);
	iluDeleteImage(image4);

	return 0;
}

I solved my original problem by using the ilu gen/delete rather than the il gen/delete, but now I have a new problem. The program stalls in the function BlendTextures. Specifically it stalls on the first ilOverlayImage call. I don''t know why.

MindCode

Author

MindCode

Oct 28, 2002 at 12:40 PM

Here''s what I''m doing. The whole shebang.


void AddAlphaChannel(float fAlpha1, float fAlpha2, float fAlpha3, float fAlpha4) {

	ILint iWidth  = ilGetInteger(IL_IMAGE_WIDTH);
	ILint iHeight = ilGetInteger(IL_IMAGE_HEIGHT);

	ILubyte *pData = ilGetData();

	ILubyte *pAlpha = new ILubyte[iWidth*iHeight*4];

	ILubyte *pBuf = pAlpha;



	float fMinDelta = fAlpha4 - fAlpha1;
	float fMaxDelta = fAlpha3 - fAlpha2;

	float fMinInc = fMinDelta / float(iHeight);
	float fMaxInc = fMaxDelta / float(iHeight);

	float fMin = fAlpha1;
	float fMax = fAlpha2;


	for(int y = 0; y < iHeight; y++) {


		float fDx = fMax - fMin;

		float fInc = fDx / float(iWidth);

		float fAlpha = fMin;

		fMin += fMinInc;
		fMax += fMaxInc;


		for(int x = 0; x < iWidth; x++) {

			float K = fAlpha * 255.f;

			pBuf[0] = pData[2];
			pBuf[1] = pData[1];
			pBuf[2] = pData[0];
			pBuf[3] = ILubyte(K);

			fAlpha += fInc;

			pBuf += 4;
			pData += 3;
	 }
	}


	ilTexImage(iWidth, iHeight, 1, 4, IL_RGBA, IL_UNSIGNED_BYTE, pAlpha);
}


void BlendTextures(ILuint ILimage1, ILuint ILimage2, ILuint ILimage3, ILuint ILimage4) {

	ilBindImage(ILimage1);

	AddAlphaChannel(1.f, 0.f, 0.f, 0.f);

	ilBindImage(ILimage2);

	AddAlphaChannel(0.f, 1.f, 0.f, 0.f);

	ilBindImage(ILimage3);

	AddAlphaChannel(0.f, 0.f, 1.f, 0.f);

	ilBindImage(ILimage4);

	AddAlphaChannel(0.f, 0.f, 0.f, 1.f);


	ILuint ILblend;

	ILblend = iluGenImage();

	ilTexImage(128, 128, 1, 4, IL_RGBA, IL_UNSIGNED_BYTE, NULL);

	ilOverlayImage(ILimage1, 0, 0, 0);
	ilOverlayImage(ILimage2, 0, 0, 0);
	ilOverlayImage(ILimage3, 0, 0, 0);
	ilOverlayImage(ILimage4, 0, 0, 0);

	ilSaveImage("Test.bmp");

	iluDeleteImage(ILblend);
}


int main(int argc, char *argv[]) {

	ilInit();
	iluInit();
	ilEnable(IL_FILE_OVERWRITE);

	ILuint image1,image2,image3,image4;

	image1 = iluGenImage();
	image2 = iluGenImage();
	image3 = iluGenImage();
	image4 = iluGenImage();

	ilBindImage(image1);
	ilLoadImage("Grass.bmp");
	ilBindImage(image2);
	ilLoadImage("Dessert.bmp");
	ilBindImage(image3);
	ilLoadImage("Leaves.bmp");
	ilBindImage(image4);
	ilLoadImage("Water.bmp");

	BlendTextures(image1,image2,image3,image4);

	iluDeleteImage(image1);
	iluDeleteImage(image2);
	iluDeleteImage(image3);
	iluDeleteImage(image4);

	return 0;
}

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