Sets the default value for CombinerDescription.
m_CombinerUnit[0].m_SrcRGB[0] = m_CombinerUnit[0].m_SrcRGB[1] = m_CombinerUnit[0].m_SrcRGB[2] = m_CombinerUnit[0].m_SrcRGB[3] = SOURCE_CONSTANT;
m_CombinerUnit[0].m_SrcAlpha[0] = m_CombinerUnit[0].m_SrcAlpha[1] = m_CombinerUnit[0].m_SrcAlpha[2] = m_CombinerUnit[0].m_SrcAlpha[3] = SOURCE_CONSTANT; n is texture combiner unit 1 through 5
m_CombinerUnit[n].m_SrcRGB[0] = m_CombinerUnit[n].m_SrcRGB[1] = m_CombinerUnit[n].m_SrcRGB[2] = m_CombinerUnit[n].m_SrcRGB[3] = SOURCE_PREVIOUS;
m_CombinerUnit[n].m_SrcAlpha[0] = m_CombinerUnit[n].m_SrcAlpha[1] = m_CombinerUnit[n].m_SrcAlpha[2] = m_CombinerUnit[n].m_SrcAlpha[3] = SOURCE_PREVIOUS;
m_CombinerUnit[n].m_OperandRgb[0] = m_CombinerUnit[n].m_OperandRgb[1] = m_CombinerUnit[n].m_OperandRgb[2] = OPERAND_RGB_SRC_COLOR;
m_CombinerUnit[n].m_OperandAlpha[0] = m_CombinerUnit[n].m_OperandAlpha[1] = m_CombinerUnit[n].m_OperandAlpha[2] = OPERAND_ALPHA_SRC_ALPHA;
m_CombinerUnit[n].m_CombineRgb = COMBINE_RGB_REPLACE;
m_CombinerUnit[n].m_CombineAlpha = COMBINE_ALPHA_REPLACE;
m_CombinerUnit[n].m_ScaleRgb = SCALE_1;
m_CombinerUnit[n].m_ScaleAlpha = SCALE_1;
m_BufferColor[0] = m_BufferColor[1] = m_BufferColor[2] = m_BufferColor[3] = 0;
m_CombinerInUse = 0;
m_BufferInput.m_Rgb1 = m_BufferInput.m_Rgb2 = m_BufferInput.m_Rgb3 = m_BufferInput.m_Rgb4 = INPUT_PREVIOUS_BUFFER;
m_BufferInput.m_Alpha1 = m_BufferInput.m_Alpha2 = m_BufferInput.m_Alpha3 = m_BufferInput.m_Alpha4 = INPUT_PREVIOUS_BUFFER;