GLKit中的纹理映射不仅适用于设备 [英] Texture mapping in GLKit is not working only in devices

问题描述

我使用此链接中的代码来映​​射人脸的纹理。此代码使用 GLKIT 来渲染图像。代码在模拟器中工作正常，但如果我在设备中运行它无法正常工作，则代码相同。下面是它在设备中工作的图像的屏幕截图，而不是在我的ipad中。

I used the code in this link to map textures of human faces. This code uses GLKIT to render the images. Code works fine in simulator but the same code if I run in device its not working. The below are the screen shots of the images where it works in device and not in my ipad.

我用来加载纹理的代码：

Code I used to Load Texture:

- (void)loadTexture:(UIImage *)textureImage
{
    glGenTextures(1, &_texture);
    glBindTexture(GL_TEXTURE_2D, _texture);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    CGImageRef cgImage = textureImage.CGImage;
    float imageWidth = CGImageGetWidth(cgImage);
    float imageHeight = CGImageGetHeight(cgImage);
    CFDataRef data = CGDataProviderCopyData(CGImageGetDataProvider(cgImage));

    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, imageWidth, imageHeight, 0, GL_RGBA,  
    GL_UNSIGNED_BYTE, CFDataGetBytePtr(data));
}

模拟器的图像：

相同的代码在设备中提供以下输出：

The same code in device gives the following output:

我有什么东西不见了？

推荐答案

我最后陷入困境并切换到GLKTextureLoader。正如亚当提到的那样，它非常坚固。

I finally caved in and switched to GLKTextureLoader. As Adam mentions, it's pretty sturdy.

这是一个可能适合你的实现：

Here's an implementation which might work for you:

- (void)loadTexture:(NSString *)fileName
{
    NSDictionary* options = [NSDictionary dictionaryWithObjectsAndKeys:
                             [NSNumber numberWithBool:YES],
                             GLKTextureLoaderOriginBottomLeft,
                             nil];

    NSError* error;
    NSString* path = [[NSBundle mainBundle] pathForResource:fileName ofType:nil];
    GLKTextureInfo* texture = [GLKTextureLoader textureWithContentsOfFile:path options:options error:&error];
    if(texture == nil)
    {
        NSLog(@"Error loading file: %@", [error localizedDescription]);
    }

    glBindTexture(GL_TEXTURE_2D, texture.name);
}

我会更改 mtl2opengl 很快就会在GitHub上投资......

I'll change it for the mtl2opengl project on GitHub soon...

这篇关于GLKit中的纹理映射不仅适用于设备的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！