GPU/Internal Registers: Difference between revisions

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=== GPUREG_FIXEDATTRIB_INDEX ===

See [[GPU:Fixed Vertex Attributes]] and [[GPU:Immediate-Mode Vertex Submission]] for usage info.

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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~~.

If immediate-mode vertex submission is enabled (by writing 0xF to the index register) then vertex data is input here directly. The index register does not need to be re-set after each write.

=== GPUREG_RESTART_PRIMITIVE ===

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

! Bits

! Description

|-

| 0-7

| Writing 0x01 to this field ends the current triangle strip or fan. This is necessary before using these kinds of primitives with [[GPU:Immediate-Mode Vertex Submission|immediate-mode]], but most games seem to write to it before every draw call.

|}

== Geometry shader registers ==

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 === GPUREG_FIXEDATTRIB_INDEX ===
+See [[GPU:Fixed Vertex Attributes]] and [[GPU:Immediate-Mode Vertex Submission]] for usage info.
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@@ Line 4,035: / Line 4,037: @@
 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.
+If immediate-mode vertex submission is enabled (by writing 0xF to the index register) then vertex data is input here directly. The index register does not need to be re-set after each write.
+=== GPUREG_RESTART_PRIMITIVE ===
+{| class="wikitable" border="1"
+! Bits
+! Description
+|-
+| 0-7
+| Writing 0x01 to this field ends the current triangle strip or fan. This is necessary before using these kinds of primitives with [[GPU:Immediate-Mode Vertex Submission|immediate-mode]], but most games seem to write to it before every draw call.
+|}
 == Geometry shader registers ==