NV3 RAMIN - Revision history

Starfrost at 00:25, 4 July 2025

2025-07-04T00:25:27Z

← Older revision		Revision as of 00:25, 4 July 2025
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	'''Instance memory''' (<code>RAMIN</code>, sometimes <code>PRAMIN</code>) is an area of VRAM where structures for objects to be operated on by the GPU are placed; it is technically considered to be a section of [[NV3 PFIFO\|<code>PFIFO</code>), since it deals with object submission, but it is useful to understand it as a separate syste. It does not use traditional VRAM addressing, but instead uses its own addressing method which is fairly peculiar; at a high level, it is basically identical to VRAM, but addressed in reverse in 16-byte increments; within those 16 bytes the addressing is done in a traditional order, but the actual 16 byte "windows" are addressed in reverse. RAMIN addresses can be converted to VRAM addresses using the following formula:		'''Instance memory''' (<code>RAMIN</code>, sometimes <code>PRAMIN</code>) is an area of VRAM where structures for objects to be operated on by the GPU are placed; it is technically considered to be a section of [[NV3 PFIFO\|<code>PFIFO</code>]], since it deals with object submission, but it is useful to understand it as a separate syste. It does not use traditional VRAM addressing, but instead uses its own addressing method which is fairly peculiar; at a high level, it is basically identical to VRAM, but addressed in reverse in 16-byte increments; within those 16 bytes the addressing is done in a traditional order, but the actual 16 byte "windows" are addressed in reverse. RAMIN addresses can be converted to VRAM addresses using the following formula:

	<pre>		<pre>

Starfrost at 14:30, 30 June 2025

2025-06-30T14:30:49Z

@@ Line 1: / Line 1: @@
-'''Instance memory''' (<code>RAMIN</code>, sometimes <code>PRAMIN</code>) is an area of VRAM where structures for objects to be operated on by the GPU are placed. It does not use traditional VRAM addressing, but instead uses its own addressing method which is fairly peculiar; at a high level, it is basically addressed in reverse, but in 16-byte increments; within those 16 bytes the addressing is done in a traditional order. RAMIN addresses can be converted to VRAM addresses using the following formula:
+'''Instance memory''' (<code>RAMIN</code>, sometimes <code>PRAMIN</code>) is an area of VRAM where structures for objects to be operated on by the GPU are placed; it is technically considered to be a section of [[NV3 PFIFO|<code>PFIFO</code>), since it deals with object submission, but it is useful to understand it as a separate syste. It does not use traditional VRAM addressing, but instead uses its own addressing method which is fairly peculiar; at a high level, it is basically identical to VRAM, but addressed in reverse in 16-byte increments; within those 16 bytes the addressing is done in a traditional order, but the actual 16 byte "windows" are addressed in reverse. RAMIN addresses can be converted to VRAM addresses using the following formula:
 <pre>
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 where <code>reversal_unit_size</code> is equal to 16.

Starfrost: Created page with "'''Instance memory''' (`RAMIN`, sometimes `PRAMIN`) is an area of VRAM where structures for objects to be operated on by the GPU are placed. It does not use traditional VRAM addressing, but instead uses its own addressing method which is fairly peculiar; at a high level, it is basically addressed in reverse, but in 16-byte increments; within those 16 bytes the addressing is done in a traditional order. RAMIN addresses can be converted to VRAM addres..."

2025-06-30T13:13:51Z

Created page with "'''Instance memory''' (<code>RAMIN</code>, sometimes <code>PRAMIN</code>) is an area of VRAM where structures for objects to be operated on by the GPU are placed. It does not use traditional VRAM addressing, but instead uses its own addressing method which is fairly peculiar; at a high level, it is basically addressed in reverse, but in 16-byte increments; within those 16 bytes the addressing is done in a traditional order. RAMIN addresses can be converted to VRAM addres..."

New page

'''Instance memory''' (<code>RAMIN</code>, sometimes <code>PRAMIN</code>) is an area of VRAM where structures for objects to be operated on by the GPU are placed. It does not use traditional VRAM addressing, but instead uses its own addressing method which is fairly peculiar; at a high level, it is basically addressed in reverse, but in 16-byte increments; within those 16 bytes the addressing is done in a traditional order. RAMIN addresses can be converted to VRAM addresses using the following formula:

<pre>
addr &= (vram_max - 1);
addr ^= (vram_max - 0x10);
addr >>= 2; // what
</pre>

Or expressed in a more linguistic way:

<pre>
real VRAM address = VRAM_size - (ramin_address - (ramin_address % reversal_unit_size)) - reversal_unit_size + (ramin_address % reversal_unit_size)
</pre>

where <code>reversal_unit_size</code> is equal to 16.