Mesa (gallium-index-bias): gallium/docs: Make it clear that minIndex, maxIndex is exclusively a index buffer characteristic.
Jose Fonseca
jrfonseca at kemper.freedesktop.org
Tue Apr 20 08:37:33 UTC 2010
Module: Mesa
Branch: gallium-index-bias
Commit: 493a1bb822f80f48cf284cb572acb5dd393a07e1
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=493a1bb822f80f48cf284cb572acb5dd393a07e1
Author: José Fonseca <jfonseca at vmware.com>
Date: Tue Apr 20 10:22:28 2010 +0200
gallium/docs: Make it clear that minIndex, maxIndex is exclusively a index buffer characteristic.
Unlike the indexBias which is specific to a draw call.
This are the semantics of both D3D and GL ARB_draw_elements_base_vertex
extension.
---
src/gallium/docs/source/context.rst | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/src/gallium/docs/source/context.rst b/src/gallium/docs/source/context.rst
index 69e0fcc..c82e681 100644
--- a/src/gallium/docs/source/context.rst
+++ b/src/gallium/docs/source/context.rst
@@ -156,6 +156,9 @@ as indices to fetch vertex attributes.
``indexBias`` is a value which is added to every index read from the index
buffer before fetching vertex attributes.
+``minIndex`` and ``maxIndex`` describe minimum and maximum index contained in
+the index buffer.
+
If a given vertex element has ``instance_divisor`` set to 0, it is said
it contains per-vertex data and effective vertex attribute address needs
to be recalculated for every index.
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