problem with PNG files and devil
Author
hi
i have a png file with alpha chanel but i cant use the alpha chanel in opengl in other word all of the transparent pixels shown dark
this is my code, where is my problem?
ilGenImages (1, &ImgId);
ilOriginFunc(IL_ORIGIN_LOWER_LEFT);
ilEnable(IL_ORIGIN_SET);
ilBindImage (ImgId);
ilutGLLoadImage("C:/kge.png");
Width = ilGetInteger(IL_IMAGE_WIDTH);
Height = ilGetInteger(IL_IMAGE_HEIGHT);
ilConvertImage(IL_RGBA,IL_UNSIGNED_INT);
sourcedata = ilGetData();
ilDeleteImages(1, &ImgId);
glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA);
glRasterPos2i(0,0);
glDrawPixels(Width ,Height,GL_RGBA,GL_UNSIGNED_INT, sourcedata);
and,when i enable blending, any thing dont be shown
It depends on what values are present in the alpha, so have a look at sourcedata with a debugger.
Why do you use ilConvertImage(IL_RGBA,IL_UNSIGNED_INT)
instead of just using unsigned bytes?
Why do you use ilConvertImage(IL_RGBA,IL_UNSIGNED_INT)
instead of just using unsigned bytes?
Author
hi
i use ilConvertImage for using all of the components in the png file ( in default devil use RGB)
unsigned int--> 8bits for every component (RGBA) => 32bit(UNSIGNED_INT)
i use ilConvertImage for using all of the components in the png file ( in default devil use RGB)
unsigned int--> 8bits for every component (RGBA) => 32bit(UNSIGNED_INT)
unsigned int means that every component will be 32 bit. So each pixel will be 128-bit sized with RGBA.
Quote:Original post by keltarSo each pixel will be 128-bit sized with RGBA.
Exactly.
Besides, why glDrawPixels? It's definetely not the fastest way to do it…
You can draw this image using the texture prepared by ilutGLLoadImage.
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