Implemented ARB_texture_barrier.

doc/opengl-mapping.dox

@@ -339,7 +339,7 @@ OpenGL function                         | Matching API
 @fn_gl{TexStorage1D}, \n `glTextureStorage1D()`, \n @fn_gl_extension{TextureStorage1D,EXT,direct_state_access}, \n @fn_gl{TexStorage2D}, \n `glTextureStorage2D()`, \n @fn_gl_extension{TextureStorage2D,EXT,direct_state_access}, \n @fn_gl{TexStorage3D}, \n `glTextureStorage3D()`, \n @fn_gl_extension{TextureStorage3D,EXT,direct_state_access} | @ref Texture::setStorage(), \n @ref TextureArray::setStorage(), \n @ref CubeMapTexture::setStorage(), \n @ref CubeMapTextureArray::setStorage(), \n @ref RectangleTexture::setStorage()
 @fn_gl{TexStorage2DMultisample}, \n `glTextureStorage2DMultisample()`, \n @fn_gl_extension{TextureStorage2DMultisample,EXT,direct_state_access}, \n @fn_gl{TexStorage3DMultisample}, \n `glTextureStorage3DMultisample()`, \n @fn_gl_extension{TextureStorage3DMultisample,EXT,direct_state_access} | @ref MultisampleTexture::setStorage()
 @fn_gl{TexSubImage1D}, \n `glTextureSubImage1D()`, \n @fn_gl_extension{TextureSubImage1D,EXT,direct_state_access}, \n @fn_gl{TexSubImage2D}, \n `glTextureSubImage2D()`, \n @fn_gl_extension{TextureSubImage2D,EXT,direct_state_access}, \n @fn_gl{TexSubImage3D}, \n `glTextureSubImage3D()`, \n @fn_gl_extension{TextureSubImage3D,EXT,direct_state_access} | @ref Texture::setSubImage(), \n @ref TextureArray::setSubImage(), \n @ref CubeMapTexture::setSubImage(), \n @ref CubeMapTextureArray::setSubImage(), \n @ref RectangleTexture::setSubImage()
-@fn_gl{TextureBarrier}                  | |
+@fn_gl{TextureBarrier}                  | @ref Renderer::setTextureBarrier()
 @fn_gl{TextureView}                     | |
 @fn_gl{TransformFeedbackBufferBase}, \n @fn_gl{TransformFeedbackBufferRange} | @ref TransformFeedback::attachBuffer(), \n @ref TransformFeedback::attachBuffers()
 @fn_gl{TransformFeedbackVaryings}       | @ref AbstractShaderProgram::setTransformFeedbackOutputs()

doc/opengl-support.dox

@@ -224,7 +224,7 @@ GLSL 4.50                                   | done
 @extension{ARB,direct_state_access}         | done for implemented functionality (except VAOs)
 @extension{ARB,get_texture_sub_image}       | done
 @extension{ARB,shader_texture_image_samples} | done (shading language only)
-@extension{ARB,texture_barrier}             | |
+@extension{ARB,texture_barrier}             | done
 @extension{KHR,context_flush_control}       | |
 @extension{KHR,robustness}                  | |
 

src/Magnum/Renderer.h

@@ -1337,6 +1337,22 @@ class MAGNUM_EXPORT Renderer {
         }
         #endif
 
+        #ifndef MAGNUM_TARGET_GLES
+        /**
+         * @brief Set texture barrier
+         *
+         * Calling the function ensures that texel fetches in drawing
+         * operations after the barrier will reflect texel writes before the
+         * barrier.
+         * @see @fn_gl{TextureBarrier}
+         * @requires_gl45 Extension @extension{ARB,texture_barrier}
+         * @requires_gl Texture barrier is not available in OpenGL ES or WebGL.
+         */
+        void setTextureBarrier() {
+            glTextureBarrier();
+        }
+        #endif
+
         /*@}*/
 
         /** @{ @name Renderer management */