Geometry processor capable of executing input/output and high speed geometry calculation processing in parallel

A geometry processor, comprising:

• first and second external interface ports independent from each other, connected to a host processor, and a rendering processor, respectively;
• and
• a geometry calculation core provided with a geometry calculation instruction from said host processor through said first external interface,
• said geometry calculation core including
• a plurality of SIMD type floating point calculating units each having an input connected to said first external interface,
• a floating point power computing unit having an input connected to said first external interface,
• an integer calculating unit having an input connected to said first external interface,
• a controller responsive to an instruction from said host processor which controls the plurality of floating point calculating units, the floating point computing unit and the integer calculating unit to process data from said host processor, and
• an output controller connected to outputs of said plurality of floating points calculating units, an output of said floating point power computing unit and an output of said integer calculating unit, which outputs data after processing by these units, to said rendering processor through said second external interface.