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[[Category:GFX]]
(this page is hugely WIP)
(this page is hugely WIP)
== 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.
There are three main types of registers :
* 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]])
* action triggering registers, which tell the GPU to do something, like draw a primitive (for example : [[#GPUREG_DRAWARRAYS|GPUREG_DRAWARRAYS]])
== Register list ==
{| class="wikitable" border="1"
{| class="wikitable" border="1"
! Register ID
! Register ID
| 022E
| 022E
| [[#GPUREG_DRAWARRAYS|GPUREG_DRAWARRAYS]]
| [[#GPUREG_DRAWARRAYS|GPUREG_DRAWARRAYS]]
| ?
|
|-
|-
| 022F
| 022F
| [[#GPUREG_DRAWELEMENTS|GPUREG_DRAWELEMENTS]]
| [[#GPUREG_DRAWELEMENTS|GPUREG_DRAWELEMENTS]]
| ?
|
|-
|-
| 0230
| 0230
|
|
|}
|}
== GPUREG_FINALIZE ==
Writing to this register seems to signal the GPU to stop processing GPU commands from the current buffer; any command following a write to this register will be ignored. The value written to this register does not appear to matter, although 0x12345678 is the value typically written by commercial software.
Failure to write to this register in any command buffer will result in the GPU hanging.