源颜色参数值

ZERO ONE SRC_COLOR ONE_MINUS_SRC_COLOR DST_COLOR ONE_MINUS_DST_COLOR SRC_ALPHA ONE_MINUS_SRC_ALPHA DST_ALPHA ONE_MINUS_DST_ALPHA SRC_ALPHA_SATURATE CONSTANT_COLOR ONE_MINUS_CONSTANT_COLOR CONSTANT_ALPHA ONE_MINUS_CONSTANT_ALPHA

目标颜色参数值

ZERO ONE SRC_COLOR ONE_MINUS_SRC_COLOR DST_COLOR ONE_MINUS_DST_COLOR SRC_ALPHA ONE_MINUS_SRC_ALPHA DST_ALPHA ONE_MINUS_DST_ALPHA CONSTANT_COLOR ONE_MINUS_CONSTANT_COLOR CONSTANT_ALPHA ONE_MINUS_CONSTANT_ALPHA