Support for ES2 extension NV_framebuffer_blit.

src/AbstractFramebuffer.h

@@ -82,7 +82,8 @@ class MAGNUM_EXPORT AbstractFramebuffer {
          *
          * @see BlitMask
          * @requires_gl30 %Extension @extension{EXT,framebuffer_object}
-         * @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit}
+         * @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit} or
+         *      @es_extension{NV,framebuffer_blit}
          */
         enum class Blit: GLbitfield {
             ColorBuffer = GL_COLOR_BUFFER_BIT,    /**< Color buffer */
@@ -95,7 +96,8 @@ class MAGNUM_EXPORT AbstractFramebuffer {
          *
          * @see blit()
          * @requires_gl30 %Extension @extension{EXT,framebuffer_object}
-         * @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit}
+         * @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit} or
+         *      @es_extension{NV,framebuffer_blit}
          */
         typedef Corrade::Containers::EnumSet<Blit, GLbitfield,
             GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT> BlitMask;
@@ -120,8 +122,8 @@ class MAGNUM_EXPORT AbstractFramebuffer {
             /**
              * For reading only.
              * @requires_gl30 %Extension @extension{EXT,framebuffer_blit}
-             * @requires_gles30 %Extension @es_extension{APPLE,framebuffer_multisample}
-             *      or @es_extension{ANGLE,framebuffer_blit}
+             * @requires_gles30 %Extension @es_extension{APPLE,framebuffer_multisample},
+             *      @es_extension{ANGLE,framebuffer_blit} or @es_extension{NV,framebuffer_blit}
              */
             #ifndef MAGNUM_TARGET_GLES2
             Read = GL_READ_FRAMEBUFFER,
@@ -132,8 +134,8 @@ class MAGNUM_EXPORT AbstractFramebuffer {
             /**
              * For drawing only.
              * @requires_gl30 %Extension @extension{EXT,framebuffer_blit}
-             * @requires_gles30 %Extension @es_extension{APPLE,framebuffer_multisample}
-             *      or @es_extension{ANGLE,framebuffer_blit}
+             * @requires_gles30 %Extension @es_extension{APPLE,framebuffer_multisample},
+             *      @es_extension{ANGLE,framebuffer_blit} or @es_extension{NV,framebuffer_blit}
              */
             #ifndef MAGNUM_TARGET_GLES2
             Draw = GL_DRAW_FRAMEBUFFER,
@@ -161,7 +163,8 @@ class MAGNUM_EXPORT AbstractFramebuffer {
          * blitting operation.
          * @see @fn_gl{BlitFramebuffer}
          * @requires_gl30 %Extension @extension{EXT,framebuffer_blit}
-         * @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit}
+         * @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit} or
+         *      @es_extension{NV,framebuffer_blit}
          */
         static void blit(AbstractFramebuffer& source, AbstractFramebuffer& destination, const Rectanglei& sourceRectangle, const Rectanglei& destinationRectangle, BlitMask mask, BlitFilter filter);
 
@@ -178,7 +181,8 @@ class MAGNUM_EXPORT AbstractFramebuffer {
          * @ref BlitFilter "BlitFilter::Nearest" filtering is used by default.
          * @see @fn_gl{BlitFramebuffer}
          * @requires_gl30 %Extension @extension{EXT,framebuffer_blit}
-         * @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit}
+         * @requires_gles30 %Extension @es_extension{ANGLE,framebuffer_blit} or
+         *      @es_extension{NV,framebuffer_blit}
          */
         inline static void blit(AbstractFramebuffer& source, AbstractFramebuffer& destination, const Rectanglei& rectangle, BlitMask mask) {
             blit(source, destination, rectangle, rectangle, mask, BlitFilter::Nearest);

src/Context.cpp

@@ -232,6 +232,7 @@ const std::vector<Extension>& Extension::extensions(Version version) {
         _extension(GL,NV,read_buffer),
         _extension(GL,NV,read_depth),
         _extension(GL,NV,read_depth_stencil),
+        _extension(GL,NV,framebuffer_blit),                 // done
         _extension(GL,OES,depth24),
         _extension(GL,OES,element_index_uint),
         _extension(GL,OES,rgb8_rgba8),

src/Extensions.h

@@ -209,6 +209,7 @@ namespace GL {
         _extension(GL,NV,read_depth,                GLES200, GLES300) // #94
         _extension(GL,NV,read_stencil,              GLES200,    None) // #94
         _extension(GL,NV,read_depth_stencil,        GLES200, GLES300) // #94
+        _extension(GL,NV,framebuffer_blit,          GLES200, GLES300) // #142
     } namespace OES {
         _extension(GL,OES,depth24,                  GLES200, GLES300) // #24
         _extension(GL,OES,depth32,                  GLES200,    None) // #25