Vertex Shader 1_1

A programmable vertex shader is made up of a set of instructions that operate on vertex data. Registers transfer data in and out of the arithmetic logic unit (ALU). Additional control can be applied to modify the instruction, the results, or what data gets written out.

• The Programmable Vertex Shader Architecture illustrates the relationship between shader registers and the vertex shader ALU.
• Instructions - vs_1_1 contains a list of the available instructions.
• Registers - vs_1_1 lists the different types of registers used by the vertex shader ALU.
• InstructionModifiers are used to modify the way an instruction works.
• Masking determines what components of the destination register get written.
• SourceModifiers alter the source register data before the instruction runs.
• Swizzling gives additional control over which register components are read, copied or written.