<div class="refentry" id="glGet">

<div class="titlepage"></div>

<div class="refnamediv">

<h2>Name</h2>

<p>glGet — return the value or values of a selected parameter</p>

</div>

<div class="refsynopsisdiv">

<h2>C Specification</h2>

<div class="funcsynopsis">

<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">void <strong class="fsfunc">glGetBooleanv</strong>(</code>

</td>

<td>GLenum <var class="pdparam">pname</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLboolean * <var class="pdparam">data</var><code>)</code>;</td>

</tr>

</table>

<div class="funcprototype-spacer"> </div>

</div>

<div class="funcsynopsis">

<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">void <strong class="fsfunc">glGetFloatv</strong>(</code>

</td>

<td>GLenum <var class="pdparam">pname</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLfloat * <var class="pdparam">data</var><code>)</code>;</td>

</tr>

</table>

<div class="funcprototype-spacer"> </div>

</div>

<div class="funcsynopsis">

<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">void <strong class="fsfunc">glGetIntegerv</strong>(</code>

</td>

<td>GLenum <var class="pdparam">pname</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLint * <var class="pdparam">data</var><code>)</code>;</td>

</tr>

</table>

<div class="funcprototype-spacer"> </div>

</div>

<div class="funcsynopsis">

<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">void <strong class="fsfunc">glGetInteger64v</strong>(</code>

</td>

<td>GLenum <var class="pdparam">pname</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLint64 * <var class="pdparam">data</var><code>)</code>;</td>

</tr>

</table>

<div class="funcprototype-spacer"> </div>

</div>

<div class="funcsynopsis">

<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">void <strong class="fsfunc">glGetBooleani_v</strong>(</code>

</td>

<td>GLenum <var class="pdparam">target</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLuint <var class="pdparam">index</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLboolean * <var class="pdparam">data</var><code>)</code>;</td>

</tr>

</table>

<div class="funcprototype-spacer"> </div>

</div>

<div class="funcsynopsis">

<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">void <strong class="fsfunc">glGetIntegeri_v</strong>(</code>

</td>

<td>GLenum <var class="pdparam">target</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLuint <var class="pdparam">index</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLint * <var class="pdparam">data</var><code>)</code>;</td>

</tr>

</table>

<div class="funcprototype-spacer"> </div>

</div>

<div class="funcsynopsis">

<table style="border: 0; cellspacing: 0; cellpadding: 0;" class="funcprototype-table">

<tr>

<td>

<code class="funcdef">void <strong class="fsfunc">glGetInteger64i_v</strong>(</code>

</td>

<td>GLenum <var class="pdparam">target</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLuint <var class="pdparam">index</var>, </td>

</tr>

<tr>

<td> </td>

<td>GLint64 * <var class="pdparam">data</var><code>)</code>;</td>

</tr>

</table>

<div class="funcprototype-spacer"> </div>

</div>

</div>

<div class="refsect1" id="parameters">

<h2>Parameters</h2>

<div class="variablelist">

<dl class="variablelist">

<dt>

<span class="term">

<em class="parameter">

<code>pname</code>

</em>

</span>

</dt>

<dd>

<p>

Specifies the parameter value to be returned.

The symbolic constants in the list below are accepted.

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>target</code>

</em>

</span>

</dt>

<dd>

<p>

Specifies the parameter value to be returned

for indexed versions of <code class="function">glGet</code>.

The symbolic constants in the list below are accepted.

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>index</code>

</em>

</span>

</dt>

<dd>

<p>

Specifies the index of the particular element being queried.

</p>

</dd>

<dt>

<span class="term">

<em class="parameter">

<code>data</code>

</em>

</span>

</dt>

<dd>

<p>

Returns the value or values of the specified parameter.

</p>

</dd>

</dl>

</div>

</div>

<div class="refsect1" id="description">

<h2>Description</h2>

<p>

These commands return values for simple state variables in GL.

<em class="parameter"><code>pname</code></em> is a symbolic constant indicating the state variable to be returned,

and <em class="parameter"><code>params</code></em> is a pointer to an array of the indicated type in

which to place the returned data.

</p>

<p>

Type conversion is performed if <em class="parameter"><code>params</code></em> has a different type than

the state variable value being requested.

If <code class="function">glGetBooleanv</code> is called,

a floating-point (or integer) value is converted to <code class="constant">GL_FALSE</code> if

and only if it is 0.0 (or 0).

Otherwise,

it is converted to <code class="constant">GL_TRUE</code>.

If <code class="function">glGetIntegerv</code> is called, boolean values are returned as

<code class="constant">GL_TRUE</code> or <code class="constant">GL_FALSE</code>, and most floating-point values are

rounded to the nearest integer value. Floating-point colors and

normals, however, are returned with a linear mapping that maps 1.0 to

the most positive representable integer value

and

<math overflow="scroll">

<mn>-1.0</mn>

</math>

to the most negative representable integer value.

If <code class="function">glGetFloatv</code> is called,

boolean values are returned as <code class="constant">GL_TRUE</code> or <code class="constant">GL_FALSE</code>,

and integer values are converted to floating-point values.

</p>

<p>

The following symbolic constants are accepted by <em class="parameter"><code>pname</code></em>:

</p>

<div class="variablelist">

<dl class="variablelist">

<dt>

<span class="term">

<code class="constant">GL_ACTIVE_TEXTURE</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single value indicating the active multitexture unit.

The initial value is <code class="constant">GL_TEXTURE0</code>.

See <a class="citerefentry" href="glActiveTexture"><span class="citerefentry"><span class="refentrytitle">glActiveTexture</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_ALIASED_LINE_WIDTH_RANGE</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a pair of values indicating the range of

widths supported for aliased lines. See <a class="citerefentry" href="glLineWidth"><span class="citerefentry"><span class="refentrytitle">glLineWidth</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_ALIASED_POINT_SIZE_RANGE</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns two values:

the smallest and largest supported sizes for

points. The smallest size must be at most 1, and the largest size must

be at least 1.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_ALPHA_BITS</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the number of alpha bitplanes in the color buffer of the

currently bound draw framebuffer. This is defined only if all color attachments

of the draw framebuffer have identical formats, in which case the number of alpha bits

of color attachment zero are returned.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_ARRAY_BUFFER_BINDING</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single value, the name of the buffer object

currently bound to the target <code class="constant">GL_ARRAY_BUFFER</code>. If no buffer object

is bound to this target, 0 is returned. The initial value is 0.

See <a class="citerefentry" href="glBindBuffer"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_BLEND</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single boolean value indicating whether blending is

enabled. The initial value is <code class="constant">GL_FALSE</code>.

See <a class="citerefentry" href="glBlendFunc"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_BLEND_COLOR</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns four values,

the red, green, blue, and alpha values which are the components of

the blend color.

See <a class="citerefentry" href="glBlendColor"><span class="citerefentry"><span class="refentrytitle">glBlendColor</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_BLEND_DST_ALPHA</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the symbolic constant identifying the alpha destination blend

function. The initial value is <code class="constant">GL_ZERO</code>.

See <a class="citerefentry" href="glBlendFunc"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a> and <a class="citerefentry" href="glBlendFuncSeparate"><span class="citerefentry"><span class="refentrytitle">glBlendFuncSeparate</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_BLEND_DST_RGB</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the symbolic constant identifying the RGB destination blend

function. The initial value is <code class="constant">GL_ZERO</code>.

See <a class="citerefentry" href="glBlendFunc"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a> and <a class="citerefentry" href="glBlendFuncSeparate"><span class="citerefentry"><span class="refentrytitle">glBlendFuncSeparate</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_BLEND_EQUATION_ALPHA</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value, a symbolic constant indicating whether

the Alpha blend equation is <code class="constant">GL_FUNC_ADD</code>, <code class="constant">GL_FUNC_SUBTRACT</code>,

<code class="constant">GL_FUNC_REVERSE_SUBTRACT</code>, <code class="constant">GL_MIN</code> or <code class="constant">GL_MAX</code>.

See <a class="citerefentry" href="glBlendEquationSeparate"><span class="citerefentry"><span class="refentrytitle">glBlendEquationSeparate</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_BLEND_EQUATION_RGB</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value, a symbolic constant indicating whether

the RGB blend equation is <code class="constant">GL_FUNC_ADD</code>, <code class="constant">GL_FUNC_SUBTRACT</code>,

<code class="constant">GL_FUNC_REVERSE_SUBTRACT</code>, <code class="constant">GL_MIN</code> or <code class="constant">GL_MAX</code>.

See <a class="citerefentry" href="glBlendEquationSeparate"><span class="citerefentry"><span class="refentrytitle">glBlendEquationSeparate</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_BLEND_SRC_ALPHA</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the symbolic constant identifying the alpha source blend function. The initial

value is <code class="constant">GL_ONE</code>.

See <a class="citerefentry" href="glBlendFunc"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a> and <a class="citerefentry" href="glBlendFuncSeparate"><span class="citerefentry"><span class="refentrytitle">glBlendFuncSeparate</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_BLEND_SRC_RGB</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the symbolic constant identifying the RGB source blend function. The initial

value is <code class="constant">GL_ONE</code>.

See <a class="citerefentry" href="glBlendFunc"><span class="citerefentry"><span class="refentrytitle">glBlendFunc</span></span></a> and <a class="citerefentry" href="glBlendFuncSeparate"><span class="citerefentry"><span class="refentrytitle">glBlendFuncSeparate</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_BLUE_BITS</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the number of blue bitplanes in the color buffer of the

currently bound draw framebuffer. This is defined only if all color attachments

of the draw framebuffer have identical formats, in which case the number of blue bits

of color attachment zero are returned.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_COLOR_CLEAR_VALUE</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns four values:

the red, green, blue, and alpha values used to clear the color buffers.

Integer values,

if requested,

are linearly mapped from the internal floating-point representation such

that 1.0 returns the most positive representable integer value,

and

<math overflow="scroll">

<mn>-1.0</mn>

</math>

returns the most negative representable integer

value. The initial value is (0, 0, 0, 0).

See <a class="citerefentry" href="glClearColor"><span class="citerefentry"><span class="refentrytitle">glClearColor</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_COLOR_WRITEMASK</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns four boolean values:

the red, green, blue, and alpha write enables for the color

buffers. The initial value is (<code class="constant">GL_TRUE</code>, <code class="constant">GL_TRUE</code>,

<code class="constant">GL_TRUE</code>, <code class="constant">GL_TRUE</code>).

See <a class="citerefentry" href="glColorMask"><span class="citerefentry"><span class="refentrytitle">glColorMask</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_COMPRESSED_TEXTURE_FORMATS</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a list of symbolic

constants of length <code class="constant">GL_NUM_COMPRESSED_TEXTURE_FORMATS</code>

indicating which compressed texture formats are available.

See <a class="citerefentry" href="glCompressedTexImage2D"><span class="citerefentry"><span class="refentrytitle">glCompressedTexImage2D</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_COPY_READ_BUFFER_BINDING</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single value, the name of the buffer object

currently bound to the target <code class="constant">GL_COPY_READ_BUFFER</code>. If no buffer object

is bound to this target, 0 is returned. The initial value is 0.

See <a class="citerefentry" href="glBindBuffer"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_COPY_WRITE_BUFFER_BINDING</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single value, the name of the buffer object

currently bound to the target <code class="constant">GL_COPY_WRITE_BUFFER</code>. If no buffer object

is bound to this target, 0 is returned. The initial value is 0.

See <a class="citerefentry" href="glBindBuffer"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_CULL_FACE</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single boolean value indicating whether polygon culling

is enabled. The initial value is <code class="constant">GL_FALSE</code>.

See <a class="citerefentry" href="glCullFace"><span class="citerefentry"><span class="refentrytitle">glCullFace</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_CULL_FACE_MODE</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single value indicating the mode of polygon culling.

The initial value is <code class="constant">GL_BACK</code>.

See <a class="citerefentry" href="glCullFace"><span class="citerefentry"><span class="refentrytitle">glCullFace</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_CURRENT_PROGRAM</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the name of the program object that is currently active, or 0 if no program object is active.

See <a class="citerefentry" href="glUseProgram"><span class="citerefentry"><span class="refentrytitle">glUseProgram</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_DEPTH_BITS</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the number of bitplanes in the depth buffer of the

currently bound framebuffer.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_DEPTH_CLEAR_VALUE</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the value that is used to clear the depth buffer.

Integer values,

if requested,

are linearly mapped from the internal floating-point representation such

that 1.0 returns the most positive representable integer value,

and

<math overflow="scroll">

<mn>-1.0</mn>

</math>

returns the most negative representable integer

value. The initial value is 1.

See <a class="citerefentry" href="glClearDepthf"><span class="citerefentry"><span class="refentrytitle">glClearDepthf</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_DEPTH_FUNC</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the symbolic constant that indicates the depth comparison

function. The initial value is <code class="constant">GL_LESS</code>.

See <a class="citerefentry" href="glDepthFunc"><span class="citerefentry"><span class="refentrytitle">glDepthFunc</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_DEPTH_RANGE</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns two values:

the near and far mapping limits for the depth buffer.

Integer values,

if requested,

are linearly mapped from the internal floating-point representation such

that 1.0 returns the most positive representable integer value,

and

<math overflow="scroll">

<mn>-1.0</mn>

</math>

returns the most negative representable integer

value. The initial value is (0, 1).

See <a class="citerefentry" href="glDepthRangef"><span class="citerefentry"><span class="refentrytitle">glDepthRangef</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_DEPTH_TEST</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single boolean value indicating whether depth testing

of fragments is enabled. The initial value is <code class="constant">GL_FALSE</code>.

See <a class="citerefentry" href="glDepthFunc"><span class="citerefentry"><span class="refentrytitle">glDepthFunc</span></span></a> and <a class="citerefentry" href="glDepthRangef"><span class="citerefentry"><span class="refentrytitle">glDepthRangef</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_DEPTH_WRITEMASK</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single boolean value indicating if the depth buffer

is enabled for writing. The initial value is <code class="constant">GL_TRUE</code>.

See <a class="citerefentry" href="glDepthMask"><span class="citerefentry"><span class="refentrytitle">glDepthMask</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_DISPATCH_INDIRECT_BUFFER_BINDING</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single value, the name of the buffer object

currently bound to the target <code class="constant">GL_DISPATCH_INDIRECT_BUFFER</code>. If no buffer object

is bound to this target, 0 is returned. The initial value is 0.

See <a class="citerefentry" href="glBindBuffer"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_DITHER</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single boolean value indicating whether dithering of

fragment colors and indices is enabled. The initial value is <code class="constant">GL_TRUE</code>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_DRAW_BUFFER</code>

<span class="emphasis">

<em>i</em>

</span>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

a symbolic constant indicating which buffers are being drawn to by the corresponding output color.

See <a class="citerefentry" href="glDrawBuffers"><span class="citerefentry"><span class="refentrytitle">glDrawBuffers</span></span></a>.

The initial value of <code class="constant">GL_DRAW_BUFFER0</code> is <code class="constant">GL_BACK</code>. The

initial values of draw buffers for all other output colors is <code class="constant">GL_NONE</code>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_DRAW_FRAMEBUFFER_BINDING</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the name of the framebuffer object currently bound to the <code class="constant">GL_DRAW_FRAMEBUFFER</code> target.

If the default framebuffer is bound, this value will be zero. The initial value is zero.

See <a class="citerefentry" href="glBindFramebuffer"><span class="citerefentry"><span class="refentrytitle">glBindFramebuffer</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_ELEMENT_ARRAY_BUFFER_BINDING</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single value, the name of the buffer object

currently bound to the target <code class="constant">GL_ELEMENT_ARRAY_BUFFER</code>. If no buffer object

is bound to this target, 0 is returned. The initial value is 0.

See <a class="citerefentry" href="glBindBuffer"><span class="citerefentry"><span class="refentrytitle">glBindBuffer</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_FRAGMENT_SHADER_DERIVATIVE_HINT</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

a symbolic constant indicating the mode of the derivative accuracy hint

for fragment shaders. The initial value

is <code class="constant">GL_DONT_CARE</code>.

See <a class="citerefentry" href="glHint"><span class="citerefentry"><span class="refentrytitle">glHint</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_FRONT_FACE</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns a single value indicating the winding order

of polygon front faces.

The initial value is <code class="constant">GL_CCW</code>.

See <a class="citerefentry" href="glFrontFace"><span class="citerefentry"><span class="refentrytitle">glFrontFace</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_GENERATE_MIPMAP_HINT</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

a symbolic constant indicating the mode of the generate mipmap quality hint.

The initial value is

<code class="constant">GL_DONT_CARE</code>. See

<a class="citerefentry" href="glHint"><span class="citerefentry"><span class="refentrytitle">glHint</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_GREEN_BITS</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

the number of green bitplanes in the color buffer of the

currently bound draw framebuffer. This is defined only if all color attachments

of the draw framebuffer have identical formats, in which case the number of green bits

of color attachment zero are returned.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_IMAGE_BINDING_LAYERED</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value,

corresponding to whether the image bound to the indexed image unit is layered or not.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_IMPLEMENTATION_COLOR_READ_FORMAT</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value, the format

chosen by the implementation in which pixels may be read from the

color buffer of the currently bound framebuffer in conjunction with

<code class="constant">GL_IMPLEMENTATION_COLOR_READ_TYPE</code>.

See <a class="citerefentry" href="glReadPixels"><span class="citerefentry"><span class="refentrytitle">glReadPixels</span></span></a>.

</p>

</dd>

<dt>

<span class="term">

<code class="constant">GL_IMPLEMENTATION_COLOR_READ_TYPE</code>

</span>

</dt>

<dd>

<p>

<em class="parameter"><code>params</code></em> returns one value, the type