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+--- Thread: grayscale loaded as gl_alpha: all texture is white (/thread-8550.html)
grayscale loaded as gl_alpha: all texture is white - sefiroths - Jan 17, 2011 09:37 AM
based on this source code,
http://www.71squared.com/2009/03/iphone-game-programming-tutorial-1/
i had tried to load a grayscale and loading as alpha...
what i have changed is:
in eglview, in init functions i have loaded 2 images, one grayscale, and rendered them with this gl init
PHP Code:
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);
glEnable(GL_TEXTURE_2D);
// glDisable(GL_DEPTH_TEST);
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND_SRC);
PHP Code:
CGColorSpaceRef imref=CGColorSpaceCreateDeviceRGB();
if(!CFEqual(imref,CGImageGetColorSpace(image)))pixelFormat = kTexture2DPixelFormat_A8;
do someone have an example od loading grayscale as alpha or can someone look this code?
example
i'm not able to find the error
thanks
RE: grayscale loaded as gl_alpha: all texture is white - AnotherJake - Jan 17, 2011 03:31 PM
I don't know, but the first thing you should do is get rid of that texEnv call. The default is
Code:
glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE);and I can't imagine why you'd use anything else.
RE: grayscale loaded as gl_alpha: all texture is white - sefiroths - Jan 18, 2011 12:34 AM
thanks for the fast reply.
i have putted glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_BLEND_SRC);
because in other threads around the web i have found it as a fix for this problem.
however, i tried glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_MODULATE); and doesn't solve this problem.
strange thing:
if i load the image as a rgb without alpha, the image is displayed correcly...
i gave managed the image in photoshop, and it results (as it say) grayscale/8.
i have opened windows paint and copy/paste the image and saved as bmp, nothing changed