Added support for automatic texture scaling by backbuffer ratio on backbuffer resize.

src/renderer_gl.cpp

@@ -1717,6 +1717,35 @@ namespace bgfx { namespace gl
 		{
 		}
 
+		void resizeTexture(TextureHandle _handle, uint16_t _width, uint16_t _height) BX_OVERRIDE
+		{
+			TextureGL& texture = m_textures[_handle.idx];
+
+			uint32_t size = sizeof(uint32_t) + sizeof(TextureCreate);
+			const Memory* mem = alloc(size);
+
+			bx::StaticMemoryBlockWriter writer(mem->data, mem->size);
+			uint32_t magic = BGFX_CHUNK_MAGIC_TEX;
+			bx::write(&writer, magic);
+
+			TextureCreate tc;
+			tc.m_flags   = texture.m_flags;
+			tc.m_width   = _width;
+			tc.m_height  = _height;
+			tc.m_sides   = 0;
+			tc.m_depth   = 0;
+			tc.m_numMips = 1;
+			tc.m_format  = texture.m_requestedFormat;
+			tc.m_cubeMap = false;
+			tc.m_mem     = NULL;
+			bx::write(&writer, tc);
+
+			texture.destroy();
+			texture.create(mem, tc.m_flags, 0);
+
+			release(mem);
+		}
+
 		void destroyTexture(TextureHandle _handle) BX_OVERRIDE
 		{
 			m_textures[_handle.idx].destroy();