diff --git a/MobileGL/MG_Impl/GLImpl/Framebuffer/GL_Framebuffer.cpp b/MobileGL/MG_Impl/GLImpl/Framebuffer/GL_Framebuffer.cpp
index a7b02a0b..550a9892 100644
--- a/MobileGL/MG_Impl/GLImpl/Framebuffer/GL_Framebuffer.cpp
+++ b/MobileGL/MG_Impl/GLImpl/Framebuffer/GL_Framebuffer.cpp
@@ -234,7 +234,7 @@ namespace MobileGL {
                     MG_State::pGLContext->RecordError(
                         ErrorCode::InvalidEnum,
                         MakeShared<GenericErrorInfo>("MG_Impl/GLImpl", __func__,
-                                                     std::format("bufs[{}] = %s is not an accepted value.", i,
+                                                     std::format("bufs[{}] = {} is not an accepted value.", i,
                                                                  MG_Util::ConvertGLEnumToString(bufs[i]))));
                     return;
                 }
@@ -294,6 +294,15 @@ namespace MobileGL {
             }
         }
 
+        void DrawBuffer_State(GLenum buf) {
+            if (buf == GL_NONE) {
+                DrawBuffers_State(0, nullptr);
+            } else {
+                static GLenum bufs[] = {buf};
+                DrawBuffers_State(1, bufs);
+            }
+        }
+
         void DeleteRenderbuffers_State(GLsizei n, const GLuint* renderbuffers) {
             if (n < 0) {
                 MG_State::pGLContext->RecordError(
@@ -449,7 +458,7 @@ namespace MobileGL {
                     ErrorCode::InvalidEnum,
                     MakeShared<GenericErrorInfo>(
                         "MG_Impl/GLImpl", "GetRenderbufferParameteriv_State",
-                        std::format("pname %s is not an accepted value.", MG_Util::ConvertGLEnumToString(pname))));
+                        std::format("pname {} is not an accepted value.", MG_Util::ConvertGLEnumToString(pname))));
                 return;
             }
         }
@@ -557,6 +566,10 @@ namespace MobileGL {
             FramebufferRenderbuffer_State(target, attachment, renderbuffertarget, renderbuffer);
         }
 
+        void DrawBuffer(GLenum buf) {
+            DrawBuffer_State(buf);
+        }
+
         void DrawBuffers(GLsizei n, const GLenum* bufs) {
             DrawBuffers_State(n, bufs);
         }
diff --git a/MobileGL/MG_Impl/GLImpl/Framebuffer/GL_Framebuffer.h b/MobileGL/MG_Impl/GLImpl/Framebuffer/GL_Framebuffer.h
index ce319da0..74945b28 100644
--- a/MobileGL/MG_Impl/GLImpl/Framebuffer/GL_Framebuffer.h
+++ b/MobileGL/MG_Impl/GLImpl/Framebuffer/GL_Framebuffer.h
@@ -43,6 +43,7 @@ namespace MobileGL {
         void FramebufferTexture1D(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
         void FramebufferTexture(GLenum target, GLenum attachment, GLuint texture, GLint level);
         void FramebufferRenderbuffer(GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
+        void DrawBuffer(GLenum buf);
         void DrawBuffers(GLsizei n, const GLenum* bufs);
         void DeleteRenderbuffers(GLsizei n, const GLuint* renderbuffers);
         void DeleteFramebuffers(GLsizei n, const GLuint* framebuffers);