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== Overview ==
== Overview ==
GPU internal registers are written to through GPU commands. They are used to control the GPU's behavior, ie tell it to draw stuff and how we want it drawn.
GPU internal registers are written to through GPU commands. They are used to control the GPU's behavior, that is to say tell it to draw stuff and how we want it drawn.
== Types ==
There are three main types of registers :
There are three main types of registers :
* configuration registers, which directly map to various rendering properties (for example : [[#GPUREG_FACECULLING_CONFIG|GPUREG_FACECULLING_CONFIG]])
* configuration registers, which directly map to various rendering properties (for example : [[#GPUREG_FACECULLING_CONFIG|GPUREG_FACECULLING_CONFIG]])
* data transfer registers, which can be seen as FIFOs that let us send sequential chunks of data to the GPU, such as shader code or 1D samplers (for example : [[#GPUREG_GSH_CODE_DATA|GPUREG_GSH_CODE_DATA]])
* data transfer registers, which can be seen as FIFOs that let us send sequential chunks of data to the GPU, such as shader code or 1D samplers (for example : [[#GPUREG_GSH_CODE_DATA|GPUREG_GSH_CODE_DATA]])
* action triggering registers, which tell the GPU to do something, like draw a primitive (for example : [[#GPUREG_DRAWARRAYS|GPUREG_DRAWARRAYS]])
* action triggering registers, which tell the GPU to do something, like draw a primitive (for example : [[#GPUREG_DRAWARRAYS|GPUREG_DRAWARRAYS]])
== Aliases ==
It is possible for multiple register (sequential) IDs to correspond to the same register. This is done to leverage the GPU command grouping bit which makes it possible for a single command to write data to multiple sequential register IDs. For example, register IDs 02C1 through 02C8 all correspond to [[#GPUREG_VSH_FLOATUNIFORM_DATA|GPUREG_VSH_FLOATUNIFORM_DATA]] so that a grouped command based at 02C0 will write its first parameter to [[#GPUREG_VSH_FLOATUNIFORM_CONFIG|GPUREG_VSH_FLOATUNIFORM_CONFIG]] and ever subsequent ones to [[#GPUREG_VSH_FLOATUNIFORM_DATA|GPUREG_VSH_FLOATUNIFORM_DATA]]
== Register list ==
== Register list ==
{| class="wikitable" border="1"
{| class="wikitable" border="1"
! Register ID
! Register ID