CODEWITHSUNDEEP
iphoneopengl-es
Ryan
Ryan

Reputation: 6055

Iphone OpenGL ES 1.1: texture is different color on device than simulator

I am rendering an orange pumpkin in opengl es 1.1 on the iphone.

In the simulator the pumpkin renders as expected - it is the correct orange color.

When I test on a device the pumpkin becomes blue.

What is causing this and how can I fix it?

thanks

edit, here is my texture load code:

void LoadPngImage(const std::string& filename) {
    NSString* basePath = [NSString stringWithUTF8String:filename.c_str()];
    NSString* resourcePath = [[NSBundle mainBundle] resourcePath];
    NSString* fullPath = [resourcePath  stringByAppendingPathComponent:basePath];
    UIImage* uiImage = [UIImage imageWithContentsOfFile:fullPath];
    CGImageRef cgImage = uiImage.CGImage;
    m_imageSize.x = CGImageGetWidth(cgImage);
    m_imageSize.y = CGImageGetHeight(cgImage);
    m_imageData = CGDataProviderCopyData(CGImageGetDataProvider(cgImage));
}

void* GetImageData() {
    return (void*)CFDataGetBytePtr(m_imageData);
}

edit, adding more code:

glGenTextures(1, &m_texture);
glBindTexture(GL_TEXTURE_2D, m_texture);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

m_resourceManager->LoadPngImage("Pumpkin64.png");
void* pixels = m_resourceManager->GetImageData();
ivec2 size = m_resourceManager->GetImageSize();
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, size.x, size.y, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
m_resourceManager->UnloadImage();

Upvotes: 2

Views: 621

Answers (1)

genpfault
genpfault

Reputation: 52083

I suspect an endianess problem is flipping your RGB triplets around, since orange is RGB(255,165,0) and RGB(0,165,255) is rather blue.

I'd look at your texture image loading code to make sure it gives the same output on x86 and ARM.

Upvotes: 2

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