CODEWITHSUNDEEP
androidopengl-esandroid-cameraopengl-es-2.0opengl-es-3.0
BC.Lee
BC.Lee

Reputation: 11

Android How to generate mipmap for GL_TEXTURE_EXTERNAL_OES

When i render the cameraTexture to a low resolution SurfaceView, it looks pixelated.

Seems i need to generate mipmap for the camera texture, but it doesn't work this way.

GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glGenTextures(1, glTextures, 0);
GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, glTextures[0]);

GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, GL11.GL_LINEAR_MIPMAP_LINEAR);
GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glTexParameteri(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);

mInputSurfaceTexture = new SurfaceTexture(inputTexture);
mInputSurfaceTexture.setDefaultBufferSize(CCamera.SIZE.getWidth(), CCamera.SIZE.getHeight());
mInputSurfaceTexture.setOnFrameAvailableListener(new CameraFrameListener(), mGLHandler);
mInputSurface = new Surface(mInputSurfaceTexture);

# feed mInputSurface to camera service.

public void onFrameAvailable(SurfaceTexture surfaceTexture) {
    surfaceTexture.updateTexImage();
    GLES20.glGenerateMipmap(GLES11Ext.GL_TEXTURE_EXTERNAL_OES);   
    //GLES11Ext.glGenerateMipmapOES(GLES11Ext.GL_TEXTURE_EXTERNAL_OES);
}

BTW, that is the different of :

GLES11Ext.glGenerateMipmapOES

GLES20.glGenerateMipmap

Upvotes: 0

Views: 517

Answers (1)

solidpixel
solidpixel

Reputation: 12119

You can't, at least not directly.

Implement an offscreen pass that converts the YUV to RGB to write an RGB image, and then mipmap that. If you know you only need the low resolution version, that YUV to RGB pass could also implement the initial 2:1 downsample to minimize the memory bandwidth overheads.

Upvotes: 1

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