自己动手实现OpenGL之glViewPort（一）
public static void glViewport( int x, int y, int width, int height ) {int surfaceHeight = mInfo.height;float far = mViewPortZFar;float near = mViewPortZNear;float sx = width/2.0f;float ox = sx + x;float sy = height/2.0f;float oy = sy + surfaceHeight - height - y; float A = (far - near)/2.0f;float B = (far + near)/2.0f;// compute viewport matrixfloat[][] f = new float[4][4]; f[0][0] = sx; f[0][1] = 0; f[0][2] = 0; f[0][3] = ox;f[1][0] = 0; f[1][1] =-sy; f[1][2] = 0; f[1][3] = oy;f[2][0] = 0; f[2][1] = 0; f[2][2] = A; f[2][3] = B;f[3][0] = 0; f[3][1] = 0; f[3][2] = 0; f[3][3] = 1;mCurrentViewPortMatrix = new M4();mCurrentViewPortMatrix.m = f;}
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public static void glDepthRangef( float zNear, float zFar ){ mViewPortZNear = zNear; mViewPortZFar = zFar; }?
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