diff --git a/extensions/NV/NV_primitive_shading_rate.txt b/extensions/NV/NV_primitive_shading_rate.txt
new file mode 100644
index 0000000..dc0bb42
--- /dev/null
+++ b/extensions/NV/NV_primitive_shading_rate.txt
@@ -0,0 +1,267 @@
+Name
+
+    NV_primitive_shading_rate
+
+Name Strings
+
+    GL_NV_primitive_shading_rate
+
+Contact
+
+    Pat Brown, NVIDIA Corporation (pbrown 'at' nvidia.com)
+
+Contributors
+
+    Jeff Bolz, NVIDIA
+
+Status
+
+    Shipping
+
+Version
+
+    Last Modified:      October 30, 2020
+    Revision:           1
+
+Number
+
+    OpenGL Extension #554
+    OpenGL ES Extension #332
+
+Dependencies
+
+    This extension is written against the OpenGL 4.6 Specification
+    (Compatibility Profile), dated February 2, 2019.
+
+    OpenGL 4.5 or OpenGL ES 3.2 is required.
+
+    NV_shading_rate_image is required.
+
+    This extension requires support from the OpenGL Shading Language (GLSL)
+    extension "NV_primitive_shading_rate", which can be found at the Khronos
+    Group Github site here:
+
+        https://github.com/KhronosGroup/GLSL
+
+    This extension interacts with NV_mesh_shader.
+
+Overview
+
+    This extension builds on top of the NV_shading_rate_image extension to
+    provide OpenGL API support for using a per-primitive shading rate value to
+    control the computation of the rate used to process each fragment.
+
+    In the NV_shading_rate_image extension, the shading rate for each fragment
+    produced by a primitive is determined by looking up a texel in the bound
+    shading rate image and using that value as an index into a shading rate
+    palette.  That extension provides a separate shading rate image lookup
+    enable and palette for each viewport.  When a primitive is rasterized, the
+    implementation uses the enable and palette associated with the primitive's
+    viewport to determine the shading rate.
+
+    This extension decouples the shading rate image enables and palettes from
+    viewports.  The number of enables/palettes now comes from the
+    implementation-dependent constant SHADING_RATE_IMAGE_PALETTE_COUNT_NV.  When
+    SHADING_RATE_IMAGE_PER_PRIMITIVE_NV (added here) is enabled, the value of
+    the new gl_ShadingRateNV built-in output is used to select an enable and
+    palette to determine the shading rate.  Otherwise, the viewport number for
+    the primitive is used, as in NV_shading_rate_image.
+
+
+New Procedures and Functions
+
+    None.
+
+
+New Tokens
+
+    Accepted by the <cap> parameter of Enable, Disable, and IsEnabled and by the
+    <pname> parameter of GetBooleanv, GetIntegerv, GetInteger64v, GetFloatv,
+    GetDoublev:
+
+        SHADING_RATE_IMAGE_PER_PRIMITIVE_NV             0x95B1
+
+    Accepted by the <pname> parameter of GetBooleanv, GetDoublev,
+    GetIntegerv, and GetFloatv:
+
+        SHADING_RATE_IMAGE_PALETTE_COUNT_NV             0x95B2
+
+
+Modifications to the OpenGL 4.6 Specification (Compatibility Profile)
+
+    Modify Section 14.3.1, Multisampling, as modified by the
+    NV_shading_rate_image extension.
+
+    (modify the introduction of the shading rate image functionality to decouple
+    shading rate image enables and viewports)
+
+    When using a shading rate image (Section 14.4.1), rasterization may produce
+    fragments covering multiple pixels, where each pixel is treated as a sample.
+    If any of the SHADING_RATE_IMAGE_NV enables is enabled, primitives will be
+    processed with multisample rasterization rules, regardless of the
+    MULTISAMPLE enable or the value of SAMPLE_BUFFERS.  ...
+
+
+    Modify Section 14.4.1, Shading Rate Image, as added by the
+    NV_shading_rate_image extension.
+
+    (rework the introduction of the shading rate image functionality to decouple
+    shading rate image enables and viewports)
+
+    Applications can specify the use of a shading rate that varies by (x,y)
+    location using a _shading rate image_.  For each primitive, the shading rate
+    image is enabled or disabled by selecting a single enable in an array of
+    enables whose size is given by the implementation-dependent constant
+    SHADING_RATE_IMAGE_PALETTE_COUNT_NV.  Use of a shading rate image is enabled
+    or disabled globally by using Enable or Disable with target
+    SHADING_RATE_IMAGE_NV.  A single shading rate image enable can be modified
+    by calling Enablei or Disablei with the constant SHADING_RATE_IMAGE_NV and
+    the index of the selected enable.  The shading rate image may only be used
+    with a framebuffer object.  When rendering to the default framebuffer, the
+    shading rate image enables are ignored and operations in this section are
+    disabled.  In the initial state, all shading rate image enables are
+    disabled.
+
+    The method used to select a single shading rate image enable used to process
+    each primitive is controlled by calling Enable or Disable with the target
+    SHADING_RATE_IMAGE_PER_PRIMITIVE_NV.  When enabled, a shading rate enable
+    used for a primitive is selected using an index taken from the value of the
+    built-in output gl_ShadingRateNV for the primitive's provoking vertex.  If
+    the value of gl_ShadingRateNV is negative or greater than or equal to the
+    number of shading rate enables, the shading rate used for a primitive is
+    undefined.  When SHADING_RATE_IMAGE_PER_PRIMITIVE_NV is disabled, a shading
+    rate enable is selected using the index of the viewport used for processing
+    the primitive.  In the initial state, SHADING_RATE_IMAGE_PER_PRIMITIVE_NV is
+    disabled.
+
+
+    (rework the introduction of the shading rate image functionality to decouple
+    shading rate image palettes and viewports)
+
+    A shading rate index is mapped to a _base shading rate_ using a lookup table
+    called the shading rate image palette.  There is a separate palette
+    associated with each shading rate image enable.  As with the shading rate
+    image enables, a single palette is selected for a primitive according to the
+    enable SHADING_RATE_IMAGE_PER_PRIMITIVE_NV.  The number of palettes and the
+    number of entries in each palette are given by the implementation-dependent
+    constants SHADING_RATE_IMAGE_PALETTE_COUNT_NV and
+    SHADING_RATE_IMAGE_PALETTE_SIZE_NV, respectively.  The base shading rate for
+    an (x,y) coordinate with a shading rate index of <i> will be given by entry
+    <i> of the selected palette.  If the shading rate index is greater than or
+    equal to the palette size, the results of the palette lookup are undefined.
+
+
+    (rework the introduction of ShadingRateImagePaletteNV to decouple shading
+    rate image palettes and viewports)
+
+      Shading rate image palettes are updated using the command
+
+        void ShadingRateImagePaletteNV(uint viewport, uint first, sizei count,
+                                       const enum *rates);
+
+      <viewport> specifies the number of the palette that should be updated.
+      [[ Note:  The formal parameter name <viewport> is a remnant of the
+      original NV_shading_rate_image extension, where palettes were tightly
+      coupled with viewports. ]]  <rates> is an array ...
+
+
+    (modify the discussion of ShadingRateImagePaletteNV errors to decouple
+    shading rate image palettes and viewports)
+
+        INVALID_VALUE is generated if <viewport> is greater than or equal to
+        SHADING_RATE_IMAGE_PALETTE_COUNT_NV.
+
+        INVALID_VALUE is generated if <first> plus <count> is greater than
+        SHADING_RATE_IMAGE_PALETTE_SIZE_NV.
+
+
+    (modify the discussion of GetShadingRateImagePaletteNV to decouple shading
+    rate image palettes and viewports)
+
+      Individual entries in the shading rate palette can be queried using the
+      command:
+
+        void GetShadingRateImagePaletteNV(uint viewport, uint entry,
+                                          enum *rate);
+
+      where <viewport> specifies the number of the palette to query and...
+      <entry> specifies the palette entry number.  [[ Note:  The formal
+      parameter name <viewport> is a remnant of the original
+      NV_shading_rate_image extension, where palettes were tightly coupled
+      with viewports. ]]  A single enum from Table X.1 is returned in <rate>.
+
+      Errors
+
+        INVALID_VALUE is generated if <viewport> is greater than or equal to
+        SHADING_RATE_IMAGE_PALETTE_COUNT_NV.
+
+        INVALID_VALUE is generated if <first> plus <count> is greater than
+        SHADING_RATE_IMAGE_PALETTE_SIZE_NV.
+
+
+    Modify Section 14.9.3, Multisample Fragment Operations, as edited by
+    NV_shading_rate_image.
+
+    (modify the discussion of the shading rate image multisample functionality
+    to decouple shading rate image enables and viewports)
+
+    ... This step is skipped if MULTISAMPLE is disabled or if the value of
+    SAMPLE_BUFFERS is not one, unless one or more of the SHADING_RATE_IMAGE_NV
+    enables are enabled.
+
+
+Dependencies on NV_mesh_shader
+
+    When NV_mesh_shader is supported, the "NV_primitive_shading_rate" GLSL
+    extension allows multi-view mesh shaders to write separate per-primitive
+    shading rates for each view using the built-in gl_ShadingRatePerViewNV[].
+    When gl_ShadingRatePerViewNV[] is used with
+    SHADING_RATE_IMAGE_PER_PRIMITIVE_NV enabled, a separate shading rate image
+    enable and palette will be used for each view.
+
+
+Additions to the AGL/GLX/WGL Specifications
+
+    None
+
+Errors
+
+    See the "Errors" sections for individual commands above.
+
+New State
+
+    Get Value                   Get Command        Type    Initial Value    Description                 Sec.    Attribute
+    ---------                   ---------------    ----    -------------    -----------                 ----    ---------
+    SHADING_RATE_IMAGE_         IsEnabled           B      FALSE            Use per-primitive shading   14.4.1  enable
+      PER_PRIMITIVE_NV                                                      rate to select shading
+                                                                            rate images/palettes
+
+New Implementation Dependent State
+
+                                                    Minimum
+    Get Value                Type  Get Command      Value   Description                   Sec.
+    ---------                ----- ---------------  ------- ------------------------      ------
+    SHADING_RATE_IMAGE_      Z+    GetIntegerv      16      Number of shading rate image  14.4.1
+      PALETTE_COUNT_NV                                      enables/palettes supported
+
+Issues
+
+    (1) How should we name this extension?
+
+      RESOLVED:  We are calling this extension "NV_primitive_shading_rate"
+      because it adds a new per-primitive shading rate to the variable-rate
+      shading functionality added by NV_shading_rate_image.
+
+    (2) Do we need to add queries like LAYER_PROVOKING_VERTEX and
+        VIEWPORT_INDEX_PROVOKING_VERTEX to determine the vertex used to obtain
+        the per-primitive shading rate for each primitive?
+
+      RESOLVED:  No -- we will always use the provoking vertex.  In the event
+      that this extension is standardized in the future with behavior that
+      diverges between implementations, such a query could be added as part of
+      that effort.
+
+Revision History
+
+    Revision 1 (pbrown)
+    - Internal revisions.
diff --git a/extensions/esext.php b/extensions/esext.php
index 3d80fe4..4d6946d 100644
--- a/extensions/esext.php
+++ b/extensions/esext.php
@@ -689,4 +689,6 @@
 </li>
 <li value=331><a href="extensions/QCOM/QCOM_texture_foveated2.txt">GL_QCOM_texture_foveated2</a>
 </li>
+<li value=332><a href="extensions/NV/NV_primitive_shading_rate.txt">GL_NV_primitive_shading_rate</a>
+</li>
 </ol>
diff --git a/extensions/glext.php b/extensions/glext.php
index 89618c1..1e2c0f1 100644
--- a/extensions/glext.php
+++ b/extensions/glext.php
@@ -1045,4 +1045,6 @@
 </li>
 <li value=553><a href="extensions/EXT/GLX_EXT_no_config_context.txt">GLX_EXT_no_config_context</a>
 </li>
+<li value=554><a href="extensions/NV/NV_primitive_shading_rate.txt">GL_NV_primitive_shading_rate</a>
+</li>
 </ol>
diff --git a/extensions/registry.py b/extensions/registry.py
index 86d395e..441e312 100644
--- a/extensions/registry.py
+++ b/extensions/registry.py
@@ -3660,6 +3660,13 @@
         'supporters' : { 'NVIDIA' },
         'url' : 'extensions/NV/NV_primitive_restart.txt',
     },
+    'GL_NV_primitive_shading_rate' : {
+        'number' : 554,
+        'esnumber' : 332,
+        'flags' : { 'public' },
+        'supporters' : { 'NVIDIA' },
+        'url' : 'extensions/NV/NV_primitive_shading_rate.txt',
+    },
     'GL_NV_query_resource' : {
         'number' : 511,
         'flags' : { 'public' },
diff --git a/xml/gl.xml b/xml/gl.xml
index 56513b5..3bf68cb 100644
--- a/xml/gl.xml
+++ b/xml/gl.xml
@@ -11586,7 +11586,8 @@
         <enum value="0x95AE" name="GL_SHADING_RATE_SAMPLE_ORDER_DEFAULT_NV"/>
         <enum value="0x95AF" name="GL_SHADING_RATE_SAMPLE_ORDER_PIXEL_MAJOR_NV"/>
         <enum value="0x95B0" name="GL_SHADING_RATE_SAMPLE_ORDER_SAMPLE_MAJOR_NV"/>
-        <unused start="0x95B1" end="0x95B2" vendor="NV"/>
+        <enum value="0x95B1" name="GL_SHADING_RATE_IMAGE_PER_PRIMITIVE_NV" group="EnableCap,GetPName"/>
+        <enum value="0x95B2" name="GL_SHADING_RATE_IMAGE_PALETTE_COUNT_NV" group="GetPName"/>
         <enum value="0x95B3" name="GL_SEMAPHORE_TYPE_NV" group="SemaphoreParameterName"/>
         <enum value="0x95B4" name="GL_SEMAPHORE_TYPE_BINARY_NV" group="SemaphoreParameterName"/>
         <enum value="0x95B5" name="GL_SEMAPHORE_TYPE_TIMELINE_NV" group="SemaphoreParameterName"/>
@@ -49201,6 +49202,12 @@
                 <command name="glPrimitiveRestartIndexNV"/>
             </require>
         </extension>
+        <extension name="GL_NV_primitive_shading_rate" supported="gl|glcore|gles2">
+            <require>
+                <enum name="GL_SHADING_RATE_IMAGE_PER_PRIMITIVE_NV"/>
+                <enum name="GL_SHADING_RATE_IMAGE_PALETTE_COUNT_NV"/>
+            </require>
+        </extension>
         <extension name="GL_NV_query_resource" supported="gl">
             <require>
                 <enum name="GL_QUERY_RESOURCE_TYPE_VIDMEM_ALLOC_NV"/>