GL: Fixed text rendering.

src/renderer_gl.cpp

@@ -2333,6 +2333,12 @@ namespace bgfx { namespace gl
 
 			GL_CHECK(glActiveTexture(GL_TEXTURE0) );
 			GL_CHECK(glBindTexture(GL_TEXTURE_2D, m_textures[_blitter.m_texture.idx].m_id) );
+
+			if (BX_ENABLED(BGFX_CONFIG_RENDERER_OPENGL)
+			||  BX_ENABLED(BGFX_CONFIG_RENDERER_OPENGLES >= 30) )
+			{
+				GL_CHECK(glBindSampler(0, 0) );
+			}
 		}
 
 		void blitRender(TextVideoMemBlitter& _blitter, uint32_t _numIndices) BX_OVERRIDE