texture from NSBitmapRep

[type_r503]

Hi all,

I seem to think there was a previous thread explaining this but I can't find it. I was wondering what the code was for creating a texture from an NSBitmapimageRep. What I have is






image = [NSBitmapImageRep imageRepWithContentsOfFile: [motionArray objectAtIndex:z]];
//bind data to texture

if(!image)
exit(20);


//create the texture
glGenTextures(1, &spriteData[x-1][y-1][z-1]);

//genreate texture with bitmap data
glBindTexture(GL_TEXTURE_2D, temp);

//generate the texture
glTexImage2D(GL_TEXTURE_2D, 0, 4,
[image pixelsWide], [image pixelsHigh],0,
GL_RGBA, [image bitsPerSample], [image bitmapData]);




thanks dudes.

[Jeff Binder]

You've got some of the arguments to glTexImage2D() mixed up. Here's what I use, adapted a bit for clarity:


GLuint LoadTexture(NSString *imagePath) {
NSSize size;
NSData *data;
GLuint i;

if ((data = [NSData dataWithContentsOfFile: imagePath]))
{
NSBitmapImageRep *imageRep = [NSBitmapImageRep imageRepWithData:data];

GLenum mode = (([imageRep samplesPerPixel] == 4) ? GL_RGBA :
(([imageRep samplesPerPixel] == 3) ? GL_RGB :
(([imageRep samplesPerPixel] == 2) ? GL_LUMINANCE_ALPHA :
GL_LUMINANCE)));


GLubyte *image = [imageRep bitmapData];
GLubyte *data;
GLuint samples = [imageRep samplesPerPixel];

size = [imageRep size];
data = malloc(sizeof(GLubyte) * (GLuint)(size.width * size.height * samples));

//Flip the image to convert to the GL coordinate system.
for (i = 0; i < size.height; i++) {
memcpy(data + (GLuint)((size.height - 1 - i) * size.width * samples), image + (UInt32)(i * size.width * samples), (UInt32)(size.width * samples));
}

glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, (GLsizei)(size.width), (GLsizei)(size.height), 0, mode, GL_UNSIGNED_BYTE, data);

free(data);
} else {
NSLog(@"Failed to load image %@", imagePath);

return 0;
}

return 1;
}


This compiles, but I didn't try this version of it. HTH.