opengl gpuimage 对yuv数据模糊处理

void main()

{

	vec4 textureColor;

	vec4 outColor;

	vec4 U;

	vec4 V;



	if(PixFormat == 1000.0f)

	{

		//RGB32

		textureColor = vec4(texture2D(textureUniformRGBA,textureCoordinate));

		textureColor.a = textureColor.a*RGB_Alpha;	

	}

	else

	{		

		//YUV420  TO  RGB32

		textureColor = vec4((texture2D(textureUniformY, textureCoordinate).r - 16./255.) * 1.164);

		U = vec4(texture2D(textureUniformU, textureCoordinate).r - 128./255.);

		V = vec4(texture2D(textureUniformV, textureCoordinate).r - 128./255.);

		textureColor += V * vec4(1.596, -0.813, 0, 0);

		textureColor += U * vec4(0, -0.392, 2.017, 0);

		textureColor.a = RGB_Alpha;

	}

	if(1 == dark)

	{

		float brightness = 0.45f; 	

		//模糊



		

 		vec2 firstOffset = vec2(1.3846153846 * texelWidthOffset, 1.3846153846 * texelHeightOffset) * blurSize;

 		vec2 secondOffset = vec2(3.2307692308 * texelWidthOffset, 3.2307692308 * texelHeightOffset) * blurSize;

      

 		centerTextureCoordinate = textureCoordinate;

 		oneStepLeftTextureCoordinate = textureCoordinate - firstOffset;

 		twoStepsLeftTextureCoordinate = textureCoordinate - secondOffset;

 		oneStepRightTextureCoordinate = textureCoordinate + firstOffset;

 		twoStepsRightTextureCoordinate = textureCoordinate + secondOffset;	

			

 		vec4 fragmentColor = texture2D(textureUniformRGBA, centerTextureCoordinate) * 0.2270270270;

		fragmentColor += texture2D(textureUniformRGBA, oneStepLeftTextureCoordinate) * 0.3162162162;

 		fragmentColor += texture2D(textureUniformRGBA, oneStepRightTextureCoordinate) * 0.3162162162;

 		fragmentColor += texture2D(textureUniformRGBA, twoStepsLeftTextureCoordinate) * 0.0702702703;/

 		fragmentColor += texture2D(textureUniformRGBA, twoStepsRightTextureCoordinate) * 0.0702702703;

    

		//加暗

		textureColor = vec4((fragmentColor.rgb * vec3(brightness)), fragmentColor.a);

               //最后画面

                gl_FragColor = textureColor;



	}