Implemented OES_texture_stencil8 AEP extension.

doc/opengl-support.dox

@@ -392,7 +392,7 @@ Extension                                   | Status
 @es_extension{OES,sample_variables}         | done (shading language only)
 @es_extension{OES,shader_image_atomic}      | done (shading language only)
 @es_extension{OES,shader_multisample_interpolation} | |
-@es_extension{OES,texture_stencil8}         | |
+@es_extension{OES,texture_stencil8}         | done
 @es_extension{OES,texture_storage_multisample_2d_array} | done
 
 @subsection opengl-support-webgl10 WebGL 1.0

src/Magnum/AbstractTexture.cpp

@@ -643,7 +643,7 @@ ColorFormat AbstractTexture::imageFormatForInternalFormat(const TextureFormat in
         #endif
             return ColorFormat::DepthComponent;
 
-        #ifndef MAGNUM_TARGET_GLES
+        #ifndef MAGNUM_TARGET_WEBGL
         case TextureFormat::StencilIndex8:
             return ColorFormat::StencilIndex;
         #endif
@@ -840,7 +840,7 @@ ColorType AbstractTexture::imageTypeForInternalFormat(const TextureFormat intern
             return ColorType::Float;
         #endif
 
-        #ifndef MAGNUM_TARGET_GLES
+        #ifndef MAGNUM_TARGET_WEBGL
         case TextureFormat::StencilIndex8:
             return ColorType::UnsignedByte;
         #endif

src/Magnum/ColorFormat.h

@@ -265,13 +265,14 @@ enum class ColorFormat: GLenum {
      *      data, otherwise for framebuffer reading only.
      * @requires_es_extension Extension @es_extension2{NV,read_stencil,GL_NV_read_depth_stencil},
      *      for framebuffer reading only.
+     * @requires_es_extension Extension @es_extension{ANDROID,extension_pack_es31a}/
+     *      @es_extension{OES,texture_stencil8}, for texture data only.
      * @requires_gles Stencil index is not available in WebGL.
-     * @todo Where to get GL_STENCIL_INDEX in ES?
      */
     #ifndef MAGNUM_TARGET_GLES
     StencilIndex = GL_STENCIL_INDEX,
     #else
-    StencilIndex = 0x1901,
+    StencilIndex = GL_STENCIL_INDEX_OES,
     #endif
     #endif
 

src/Magnum/TextureFormat.h

@@ -998,12 +998,13 @@ enum class TextureFormat: GLenum {
     DepthComponent32F = GL_DEPTH_COMPONENT32F,
     #endif
 
-    #ifndef MAGNUM_TARGET_GLES
+    #ifndef MAGNUM_TARGET_WEBGL
     /**
      * Stencil index, 8bit. Not supported in 3D textures.
      * @requires_gl44 Extension @extension{ARB,texture_stencil8}
-     * @requires_gl Only available as renderbuffer format in OpenGL ES and
-     *      WebGL.
+     * @requires_es_extension Extension @es_extension{ANDROID,extension_pack_es31a}/
+     *      @es_extension{OES,texture_stencil8}
+     * @requires_gles Only available as renderbuffer format in WebGL.
      */
     StencilIndex8 = GL_STENCIL_INDEX8,
     #endif