660 lines
32 KiB
XML
660 lines
32 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE book PUBLIC "-//OASIS//DTD DocBook MathML Module V1.1b1//EN"
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"http://www.oasis-open.org/docbook/xml/mathml/1.1CR1/dbmathml.dtd">
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<refentry id="glVertexAttrib">
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<refmeta>
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<refentrytitle>glVertexAttrib</refentrytitle>
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<manvolnum>3G</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>glVertexAttrib</refname>
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<refpurpose>Specifies the value of a generic vertex attribute</refpurpose>
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</refnamediv>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib1f</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLfloat <parameter>v0</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib1s</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLshort <parameter>v0</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib1d</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLdouble <parameter>v0</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI1i</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLint <parameter>v0</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI1ui</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLuint <parameter>v0</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib2f</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLfloat <parameter>v0</parameter></paramdef>
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<paramdef>GLfloat <parameter>v1</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib2s</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLshort <parameter>v0</parameter></paramdef>
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<paramdef>GLshort <parameter>v1</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib2d</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLdouble <parameter>v0</parameter></paramdef>
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<paramdef>GLdouble <parameter>v1</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI2i</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLint <parameter>v0</parameter></paramdef>
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<paramdef>GLint <parameter>v1</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI2ui</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLuint <parameter>v0</parameter></paramdef>
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<paramdef>GLuint <parameter>v1</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib3f</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLfloat <parameter>v0</parameter></paramdef>
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<paramdef>GLfloat <parameter>v1</parameter></paramdef>
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<paramdef>GLfloat <parameter>v2</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib3s</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLshort <parameter>v0</parameter></paramdef>
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<paramdef>GLshort <parameter>v1</parameter></paramdef>
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<paramdef>GLshort <parameter>v2</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib3d</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLdouble <parameter>v0</parameter></paramdef>
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<paramdef>GLdouble <parameter>v1</parameter></paramdef>
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<paramdef>GLdouble <parameter>v2</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI3i</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLint <parameter>v0</parameter></paramdef>
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<paramdef>GLint <parameter>v1</parameter></paramdef>
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<paramdef>GLint <parameter>v2</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI3ui</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLoint <parameter>v0</parameter></paramdef>
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<paramdef>GLoint <parameter>v1</parameter></paramdef>
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<paramdef>GLoint <parameter>v2</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4f</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLfloat <parameter>v0</parameter></paramdef>
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<paramdef>GLfloat <parameter>v1</parameter></paramdef>
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<paramdef>GLfloat <parameter>v2</parameter></paramdef>
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<paramdef>GLfloat <parameter>v3</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4s</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLshort <parameter>v0</parameter></paramdef>
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<paramdef>GLshort <parameter>v1</parameter></paramdef>
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<paramdef>GLshort <parameter>v2</parameter></paramdef>
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<paramdef>GLshort <parameter>v3</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4d</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLdouble <parameter>v0</parameter></paramdef>
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<paramdef>GLdouble <parameter>v1</parameter></paramdef>
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<paramdef>GLdouble <parameter>v2</parameter></paramdef>
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<paramdef>GLdouble <parameter>v3</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4Nub</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLubyte <parameter>v0</parameter></paramdef>
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<paramdef>GLubyte <parameter>v1</parameter></paramdef>
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<paramdef>GLubyte <parameter>v2</parameter></paramdef>
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<paramdef>GLubyte <parameter>v3</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI4i</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLint <parameter>v0</parameter></paramdef>
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<paramdef>GLint <parameter>v1</parameter></paramdef>
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<paramdef>GLint <parameter>v2</parameter></paramdef>
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<paramdef>GLint <parameter>v3</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI4ui</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLuint <parameter>v0</parameter></paramdef>
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<paramdef>GLuint <parameter>v1</parameter></paramdef>
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<paramdef>GLuint <parameter>v2</parameter></paramdef>
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<paramdef>GLuint <parameter>v3</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribL1d</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLdouble <parameter>v0</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribL2d</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLdouble <parameter>v0</parameter></paramdef>
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<paramdef>GLdouble <parameter>v1</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribL3d</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLdouble <parameter>v0</parameter></paramdef>
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<paramdef>GLdouble <parameter>v1</parameter></paramdef>
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<paramdef>GLdouble <parameter>v2</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribL4d</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>GLdouble <parameter>v0</parameter></paramdef>
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<paramdef>GLdouble <parameter>v1</parameter></paramdef>
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<paramdef>GLdouble <parameter>v2</parameter></paramdef>
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<paramdef>GLdouble <parameter>v3</parameter></paramdef>
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</funcprototype>
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</funcsynopsis>
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</refsynopsisdiv>
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<refsect1 id="parameters"><title>Parameters</title>
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<variablelist>
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<varlistentry>
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<term><parameter>index</parameter></term>
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<listitem>
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<para>Specifies the index of the generic vertex
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attribute to be modified.</para>
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</listitem>
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</varlistentry>
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<varlistentry>
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<term>
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<parameter>v0</parameter>,
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<parameter>v1</parameter>,
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<parameter>v2</parameter>,
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<parameter>v3</parameter>
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</term>
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<listitem>
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<para>Specifies the new values to be used for the
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specified vertex attribute.</para>
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</listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsynopsisdiv><title>C Specification</title>
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<funcsynopsis>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib1fv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLfloat *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib1sv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLshort *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib1dv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLdouble *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI1iv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI1uiv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLuint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib2fv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLfloat *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib2sv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLshort *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib2dv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLdouble *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI2iv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI2uiv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLuint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib3fv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLfloat *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib3sv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLshort *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib3dv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLdouble *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI3iv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI3uiv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLuint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4fv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLfloat *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4sv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLshort *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4dv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLdouble *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4iv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4bv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLbyte *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4ubv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLubyte *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4usv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLushort *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4uiv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLuint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4Nbv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLbyte *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4Nsv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLshort *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4Niv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4Nubv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLubyte *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4Nusv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLushort *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttrib4Nuiv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLuint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI4bv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLbyte *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI4ubv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLubyte *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI4sv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLshort *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI4usv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLushort *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI4iv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribI4uiv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLuint *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribL1dv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLdouble *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribL2dv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLdouble *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribL3dv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
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<paramdef>const GLdouble *<parameter>v</parameter></paramdef>
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</funcprototype>
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<funcprototype>
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<funcdef>void <function>glVertexAttribL4dv</function></funcdef>
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<paramdef>GLuint <parameter>index</parameter></paramdef>
|
|
<paramdef>const GLdouble *<parameter>v</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<refsect1 id="parameters2"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>index</parameter></term>
|
|
<listitem>
|
|
<para>Specifies the index of the generic vertex
|
|
attribute to be modified.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>v</parameter></term>
|
|
<listitem>
|
|
<para>Specifies a pointer to an array of values to
|
|
be used for the generic vertex attribute.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsynopsisdiv><title>C Specification</title>
|
|
<funcsynopsis>
|
|
<funcprototype>
|
|
<funcdef>void <function>glVertexAttribP1ui</function></funcdef>
|
|
<paramdef>GLuint <parameter>index</parameter></paramdef>
|
|
<paramdef>GLenum <parameter>type</parameter></paramdef>
|
|
<paramdef>GLboolean <parameter>normalized</parameter></paramdef>
|
|
<paramdef>GLuint <parameter>value</parameter></paramdef>
|
|
</funcprototype>
|
|
<funcprototype>
|
|
<funcdef>void <function>glVertexAttribP2ui</function></funcdef>
|
|
<paramdef>GLuint <parameter>index</parameter></paramdef>
|
|
<paramdef>GLenum <parameter>type</parameter></paramdef>
|
|
<paramdef>GLboolean <parameter>normalized</parameter></paramdef>
|
|
<paramdef>GLuint <parameter>value</parameter></paramdef>
|
|
</funcprototype>
|
|
<funcprototype>
|
|
<funcdef>void <function>glVertexAttribP3ui</function></funcdef>
|
|
<paramdef>GLuint <parameter>index</parameter></paramdef>
|
|
<paramdef>GLenum <parameter>type</parameter></paramdef>
|
|
<paramdef>GLboolean <parameter>normalized</parameter></paramdef>
|
|
<paramdef>GLuint <parameter>value</parameter></paramdef>
|
|
</funcprototype>
|
|
<funcprototype>
|
|
<funcdef>void <function>glVertexAttribP4ui</function></funcdef>
|
|
<paramdef>GLuint <parameter>index</parameter></paramdef>
|
|
<paramdef>GLenum <parameter>type</parameter></paramdef>
|
|
<paramdef>GLboolean <parameter>normalized</parameter></paramdef>
|
|
<paramdef>GLuint <parameter>value</parameter></paramdef>
|
|
</funcprototype>
|
|
</funcsynopsis>
|
|
</refsynopsisdiv>
|
|
<refsect1 id="parameters3"><title>Parameters</title>
|
|
<variablelist>
|
|
<varlistentry>
|
|
<term><parameter>index</parameter></term>
|
|
<listitem>
|
|
<para>Specifies the index of the generic vertex
|
|
attribute to be modified.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>type</parameter></term>
|
|
<listitem>
|
|
<para>Type of packing used on the data. This parameter must be
|
|
<constant>GL_INT_10_10_10_2</constant> or <constant>GL_UNSIGNED_INT_10_10_10_2</constant>
|
|
to specify signed or unsigned data, respectively.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term><parameter>normalized</parameter></term>
|
|
<listitem>
|
|
<para>If <constant>GL_TRUE</constant>, then the values are to be
|
|
converted to floating point values by normalizing. Otherwise,
|
|
they are converted directly to floating point values.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
<varlistentry>
|
|
<term>
|
|
<parameter>value</parameter>
|
|
</term>
|
|
<listitem>
|
|
<para>Specifies the new packed value to be used for the
|
|
specified vertex attribute.</para>
|
|
</listitem>
|
|
</varlistentry>
|
|
</variablelist>
|
|
</refsect1>
|
|
<refsect1 id="description"><title>Description</title>
|
|
<para>The <function>glVertexAttrib</function> family of entry points
|
|
allows an application to pass generic vertex attributes in
|
|
numbered locations.</para>
|
|
|
|
<para>Generic attributes are defined as four-component values
|
|
that are organized into an array. The first entry of this array
|
|
is numbered 0, and the size of the array is specified by the
|
|
implementation-dependent constant
|
|
<constant>GL_MAX_VERTEX_ATTRIBS</constant>. Individual elements
|
|
of this array can be modified with a
|
|
<function>glVertexAttrib</function> call that specifies the
|
|
index of the element to be modified and a value for that
|
|
element.</para>
|
|
|
|
<para>These commands can be used to specify one, two, three, or
|
|
all four components of the generic vertex attribute specified by
|
|
<parameter>index</parameter>. A <function>1</function> in the
|
|
name of the command indicates that only one value is passed, and
|
|
it will be used to modify the first component of the generic
|
|
vertex attribute. The second and third components will be set to
|
|
0, and the fourth component will be set to 1. Similarly, a
|
|
<function>2</function> in the name of the command indicates that
|
|
values are provided for the first two components, the third
|
|
component will be set to 0, and the fourth component will be set
|
|
to 1. A <function>3</function> in the name of the command
|
|
indicates that values are provided for the first three
|
|
components and the fourth component will be set to 1, whereas a
|
|
<function>4</function> in the name indicates that values are
|
|
provided for all four components.</para>
|
|
|
|
<para>The letters <function>s</function>,
|
|
<function>f</function>, <function>i</function>,
|
|
<function>d</function>, <function>ub</function>,
|
|
<function>us</function>, and <function>ui</function> indicate
|
|
whether the arguments are of type short, float, int, double,
|
|
unsigned byte, unsigned short, or unsigned int. When
|
|
<function>v</function> is appended to the name, the commands can
|
|
take a pointer to an array of such values.</para>
|
|
|
|
<para>Additional capitalized letters can indicate further alterations
|
|
to the default behavior of the glVertexAttrib function:</para>
|
|
|
|
<para>
|
|
The commands containing <function>N</function> indicate that
|
|
the arguments will be passed as fixed-point values that are
|
|
scaled to a normalized range according to the component
|
|
conversion rules defined by the OpenGL specification. Signed
|
|
values are understood to represent fixed-point values in the
|
|
range [-1,1], and unsigned values are understood to represent
|
|
fixed-point values in the range [0,1].
|
|
</para>
|
|
|
|
<para>
|
|
The commands containing <function>I</function> indicate that
|
|
the arguments are extended to full signed or unsigned integers.
|
|
</para>
|
|
|
|
<para>
|
|
The commands containing <function>P</function> indicate that
|
|
the arguments are stored as packed components within a larger
|
|
natural type.
|
|
</para>
|
|
|
|
<para>
|
|
The commands containing <function>L</function> indicate that
|
|
the arguments are full 64-bit quantities and should be passed directly
|
|
to shader inputs declared as 64-bit double precision types.
|
|
</para>
|
|
|
|
<para>OpenGL Shading Language attribute variables are allowed to
|
|
be of type mat2, mat3, or mat4. Attributes of these types may be
|
|
loaded using the <function>glVertexAttrib</function> entry
|
|
points. Matrices must be loaded into successive generic
|
|
attribute slots in column major order, with one column of the
|
|
matrix in each generic attribute slot.</para>
|
|
|
|
<para>A user-defined attribute variable declared in a vertex
|
|
shader can be bound to a generic attribute index by calling
|
|
<citerefentry><refentrytitle>glBindAttribLocation</refentrytitle></citerefentry>.
|
|
This allows an application to use more descriptive variable
|
|
names in a vertex shader. A subsequent change to the specified
|
|
generic vertex attribute will be immediately reflected as a
|
|
change to the corresponding attribute variable in the vertex
|
|
shader.</para>
|
|
|
|
<para>The binding between a generic vertex attribute index and a
|
|
user-defined attribute variable in a vertex shader is part of
|
|
the state of a program object, but the current value of the
|
|
generic vertex attribute is not. The value of each generic
|
|
vertex attribute is part of current state, just like standard
|
|
vertex attributes, and it is maintained even if a different
|
|
program object is used.</para>
|
|
|
|
<para>An application may freely modify generic vertex attributes
|
|
that are not bound to a named vertex shader attribute variable.
|
|
These values are simply maintained as part of current state and
|
|
will not be accessed by the vertex shader. If a generic vertex
|
|
attribute bound to an attribute variable in a vertex shader is
|
|
not updated while the vertex shader is executing, the vertex
|
|
shader will repeatedly use the current value for the generic
|
|
vertex attribute.</para>
|
|
</refsect1>
|
|
<refsect1 id="notes"><title>Notes</title>
|
|
<para>Generic vertex attributes can be updated at any time.</para>
|
|
|
|
<para>It is possible for an application to bind more than one
|
|
attribute name to the same generic vertex attribute index. This
|
|
is referred to as aliasing, and it is allowed only if just one
|
|
of the aliased attribute variables is active in the vertex
|
|
shader, or if no path through the vertex shader consumes more
|
|
than one of the attributes aliased to the same location. OpenGL
|
|
implementations are not required to do error checking to detect
|
|
aliasing, they are allowed to assume that aliasing will not
|
|
occur, and they are allowed to employ optimizations that work
|
|
only in the absence of aliasing.</para>
|
|
|
|
<para>There is no provision for binding standard vertex
|
|
attributes; therefore, it is not possible to alias generic
|
|
attributes with standard attributes.</para>
|
|
|
|
<para>
|
|
<function>glVertexAttribL</function> versions are available only if the GL version is 4.1 or higher.
|
|
</para>
|
|
</refsect1>
|
|
<refsect1 id="errors"><title>Errors</title>
|
|
<para><constant>GL_INVALID_VALUE</constant> is generated if
|
|
<parameter>index</parameter> is greater than or equal to
|
|
<constant>GL_MAX_VERTEX_ATTRIBS</constant>.</para>
|
|
|
|
<para><constant>GL_INVALID_ENUM</constant> is generated if
|
|
<function>glVertexAttribP</function> is used with a
|
|
<parameter>type</parameter> other than
|
|
<constant>GL_INT_10_10_10_2</constant> or
|
|
<constant>GL_UNSIGNED_INT_10_10_10_2</constant>.</para>
|
|
|
|
<para><constant>GL_INVALID_ENUM</constant> is generated if
|
|
<function>glVertexAttribL</function> is used with a
|
|
<parameter>type</parameter> other than
|
|
<constant>GL_DOUBLE</constant>.</para>
|
|
|
|
</refsect1>
|
|
<refsect1 id="associatedgets"><title>Associated Gets</title>
|
|
<para><citerefentry><refentrytitle>glGet</refentrytitle></citerefentry>
|
|
with the argument <constant>GL_CURRENT_PROGRAM</constant></para>
|
|
|
|
<para><citerefentry><refentrytitle>glGetActiveAttrib</refentrytitle></citerefentry>
|
|
with argument <parameter>program</parameter> and the index of an active
|
|
attribute variable</para>
|
|
|
|
<para><citerefentry><refentrytitle>glGetAttribLocation</refentrytitle></citerefentry>
|
|
with argument <parameter>program</parameter> and an attribute
|
|
variable name</para>
|
|
|
|
<para><citerefentry><refentrytitle>glGetVertexAttrib</refentrytitle></citerefentry>
|
|
with arguments <constant>GL_CURRENT_VERTEX_ATTRIB</constant> and
|
|
<parameter>index</parameter></para>
|
|
</refsect1>
|
|
<refsect1 id="seealso"><title>See Also</title>
|
|
<para><citerefentry><refentrytitle>glBindAttribLocation</refentrytitle></citerefentry>,
|
|
<citerefentry><refentrytitle>glVertexAttribPointer</refentrytitle></citerefentry></para>
|
|
</refsect1>
|
|
<refsect1 id="Copyright"><title>Copyright</title>
|
|
<para>
|
|
Copyright <trademark class="copyright"></trademark> 2003-2005 3Dlabs Inc. Ltd.
|
|
Copyright <trademark class="copyright"></trademark> 2010 Khronos Group.
|
|
This material may be distributed subject to the terms and conditions set forth in
|
|
the Open Publication License, v 1.0, 8 June 1999.
|
|
<ulink url="http://opencontent.org/openpub/">http://opencontent.org/openpub/</ulink>.
|
|
</para>
|
|
</refsect1>
|
|
</refentry>
|