GPU/Internal Registers: Difference between revisions

Line 4,020:

This register configures the geometry stage of the GPU pipeline.

=== GPUREG_FIXEDATTRIB_INDEX ===

{| class="wikitable" border="1"

! Bits

! Description

|-

| 0-31

| Sets the active fixed attribute index. This is the fixed attribute which will be set when writing to [[#GPUREG_FIXEDATTRIB_DATA|GPUREG_FIXEDATTRIB_DATA]]. Valid values are 0-11. If the special value 0xF is written here, this sets up immediate-mode vertex submission instead, and writes to the data register will input vertex data directly into the pipeline.

|}

=== GPUREG_FIXEDATTRIB_DATA ===

Accepts a packed 4-tuple of float24 values (in the same format used for [[#GPUREG_VSH_FLOATUNIFORM_DATA|specifying shader uniforms]]). This is stored as the fixed attribute value for the attribute currently specified in the index register. Attributes are always specified as a 4-tuple of floats, regardless of the format configured in [[#GPUREG_ATTRIBBUFFERS_FORMAT_HIGH|GPUREG_ATTRIBBUFFERS_FORMAT_HIGH]].

If immediate-mode vertex submission is enabled (by writing 0xF to the index register) then vertex data is input here directly. The configured number N of vertex attributes (specified in [[#GPUREG_ATTRIBBUFFERS_FORMAT_HIGH|GPUREG_ATTRIBBUFFERS_FORMAT_HIGH]]) for each vertex should be sent in sequence. One vertex is output for every N 4-tuples written, and the index register does not need to be reset between attributes or vertices.

== Geometry shader registers ==

@@ Line 4,020: / Line 4,020: @@
 This register configures the geometry stage of the GPU pipeline.
+=== GPUREG_FIXEDATTRIB_INDEX ===
+{| class="wikitable" border="1"
+! Bits
+! Description
+|-
+| 0-31
+| Sets the active fixed attribute index. This is the fixed attribute which will be set when writing to [[#GPUREG_FIXEDATTRIB_DATA|GPUREG_FIXEDATTRIB_DATA]]. Valid values are 0-11. If the special value 0xF is written here, this sets up immediate-mode vertex submission instead, and writes to the data register will input vertex data directly into the pipeline.
+|}
+=== GPUREG_FIXEDATTRIB_DATA ===
+Accepts a packed 4-tuple of float24 values (in the same format used for [[#GPUREG_VSH_FLOATUNIFORM_DATA|specifying shader uniforms]]). This is stored as the fixed attribute value for the attribute currently specified in the index register. Attributes are always specified as a 4-tuple of floats, regardless of the format configured in [[#GPUREG_ATTRIBBUFFERS_FORMAT_HIGH|GPUREG_ATTRIBBUFFERS_FORMAT_HIGH]].
+If immediate-mode vertex submission is enabled (by writing 0xF to the index register) then vertex data is input here directly. The configured number N of vertex attributes (specified in [[#GPUREG_ATTRIBBUFFERS_FORMAT_HIGH|GPUREG_ATTRIBBUFFERS_FORMAT_HIGH]]) for each vertex should be sent in sequence. One vertex is output for every N 4-tuples written, and the index register does not need to be reset between attributes or vertices.
 == Geometry shader registers ==