Question

可能重复：
I want capture screen when any game is running with opengl

我正在使用OpenGL开发动作游戏当用户最好的拍摄时我想捕获它们并上传到社交网络我使用了很多代码，但当时没有成功。一些代码在：

       NSInteger myDataLength = 480 * 320 * 4;

        // allocate array and read pixels into it.
        GLubyte *buffer = (GLubyte *) malloc(myDataLength);
        glReadPixels(0, 0, 480, 320, GL_RGBA, GL_UNSIGNED_BYTE, buffer);

        // gl renders "upside down" so swap top to bottom into new array.
        // there's gotta be a better way, but this works.
        GLubyte *buffer2 = (GLubyte *) malloc(myDataLength);
        for(int y = 0; y < 320; y++)
        {
            for(int x = 0; x < 480 * 4; x++)
            {
                buffer2[(319 - y) * 480 * 4 + x] = buffer[y * 4 * 480 + x];
            }
        }


        // make data provider with data.
        CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, buffer2, myDataLength, NULL);

        // prep the ingredients
        int bitsPerComponent = 8;
        int bitsPerPixel = 32;
        int bytesPerRow = 4 * 480;
        CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
        CGBitmapInfo bitmapInfo = kCGBitmapByteOrderDefault;
        CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;

        // make the cgimage
        CGImageRef imageRef = CGImageCreate(480, 320, bitsPerComponent, bitsPerPixel, bytesPerRow, colorSpaceRef, bitmapInfo, provider, NULL, NO,   renderingIntent);
UIImage *image = [UIImage imageWithCGImage:imageRef];

和其他代码是：

CGRect screenRect = [[UIScreen mainScreen] bounds];
UIGraphicsBeginImageContextWithOptions(screenRect.size, NO, 0.0);
[glview.parent.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

但是所有代码都在模拟器中生成图像而不在设备中（仅限黑白图像）

Answer 1

这个问题已在这里得到解答。以下是我认为您正在寻找的内容

How to get UIImage from EAGLView?

使用openGL捕获ScreenShot

1 个答案: