Upstream version 10.39.225.0

[platform/framework/web/crosswalk.git] / src / third_party / webgl / src / extensions / WEBGL_depth_texture / extension.xml

diff --git a/src/third_party/webgl/src/extensions/WEBGL_depth_texture/extension.xml b/src/third_party/webgl/src/extensions/WEBGL_depth_texture/extension.xml
index a44162f..165be19 100644 (file)
--- a/src/third_party/webgl/src/extensions/WEBGL_depth_texture/extension.xml
+++ b/src/third_party/webgl/src/extensions/WEBGL_depth_texture/extension.xml
@@ -90,6 +90,37 @@
           constraints are violated.
         </p>
       </feature>
+      <feature>
+        <p>
+          As per the OpenGL ES spec, there is no guarantee that the OpenGL ES implementation
+          will use the texture type to determine how to store the depth texture internally.
+          It may choose to downsample the 32-bit depth values to 16-bit or even 24-bit.
+          When a depth or depth/stencil texture is attached to a framebuffer object, calls to getParameter
+          with the DEPTH_BITS and STENCIL_BITS enums return the following:
+          <table>
+            <tr>
+              <th>Texture Type</th>
+              <th>DEPTH_BITS (GLint)</th>
+              <th>STENCIL_BITS (GLint)</th>
+            </tr>
+            <tr>
+              <td>UNSIGNED_SHORT</td>
+              <td>>= 16</td>
+              <td>0</td>
+            </tr>
+            <tr>
+              <td>UNSIGNED_INT</td>
+              <td>>= 16</td>
+              <td>0</td>
+            </tr>
+            <tr>
+              <td>UNSIGNED_INT_24_8_WEBGL</td>
+              <td>>= 24</td>
+              <td>>= 8</td>
+            </tr>
+          </table>
+        </p>
+      </feature>
     </features>
   </overview>
   <idl xml:space="preserve">