diff --git a/src/main/cpp/gl/drawing.c b/src/main/cpp/gl/drawing.c
index 44f674a..1f7d101 100644
--- a/src/main/cpp/gl/drawing.c
+++ b/src/main/cpp/gl/drawing.c
@@ -35,73 +35,4 @@ void glMultiDrawElements(GLenum mode,const GLsizei * count,GLenum type,const voi
             );
         }
     }
-}
-
-void glDrawBuffer(GLenum buffer) {
-    LOG()
-
-    LOAD_GLES(glDrawBuffers, void, GLsizei n, const GLenum *bufs)
-
-    GLint currentFBO;
-    glGetIntegerv(GL_FRAMEBUFFER_BINDING, &currentFBO);
-
-    if (currentFBO == 0) { // 默认帧缓冲
-        GLenum buffers[1] = {GL_NONE};
-        switch (buffer) {
-            case GL_FRONT:
-            case GL_BACK:
-            case GL_NONE:
-                buffers[0] = buffer;
-                gles_glDrawBuffers(1, buffers);
-                break;
-            default:
-                // 生成错误：GL_INVALID_ENUM
-                break;
-        }
-    } else { // FBO场景
-        GLint maxAttachments;
-        glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &maxAttachments);
-
-        if (buffer == GL_NONE) {
-            GLenum *buffers = (GLenum *)alloca(maxAttachments * sizeof(GLenum));
-            for (int i = 0; i < maxAttachments; i++) {
-                buffers[i] = GL_NONE;
-            }
-            gles_glDrawBuffers(maxAttachments, buffers);
-        } else if (buffer >= GL_COLOR_ATTACHMENT0 &&
-                   buffer < GL_COLOR_ATTACHMENT0 + maxAttachments) {
-            GLenum *buffers = (GLenum *)alloca(maxAttachments * sizeof(GLenum));
-            for (int i = 0; i < maxAttachments; i++) {
-                buffers[i] = (i == (buffer - GL_COLOR_ATTACHMENT0)) ? buffer : GL_NONE;
-            }
-            gles_glDrawBuffers(maxAttachments, buffers);
-        } else {
-            // 生成错误：GL_INVALID_ENUM
-        }
-    }
-}
-
-void glDrawBuffers(GLsizei n, const GLenum *bufs) {
-    LOG()
-
-    LOG_D("glDrawBuffers(%d, %p), [0]=0x%x", n, bufs, n ? bufs[0] : 0)
-
-    GLenum new_bufs[n];
-
-    for (int i = 0; i < n; i++) {
-        if (bufs[i] >= GL_COLOR_ATTACHMENT0 && bufs[i] <= GL_COLOR_ATTACHMENT0 + getMaxDrawBuffers()) {
-            GLenum target_attachment = GL_COLOR_ATTACHMENT0 + i;
-            new_bufs[i] = target_attachment;
-            if (bufs[i] == target_attachment)
-                continue;
-            rebind_framebuffer(bufs[i], target_attachment);
-        } else {
-            new_bufs[i] = bufs[i];
-        }
-    }
-
-    LOAD_GLES(glDrawBuffers, void, GLsizei n, const GLenum *bufs)
-    gles_glDrawBuffers(n, new_bufs);
-
-    CHECK_GL_ERROR
 }
\ No newline at end of file
diff --git a/src/main/cpp/gl/drawing.h b/src/main/cpp/gl/drawing.h
index dfc9ebb..c25901e 100644
--- a/src/main/cpp/gl/drawing.h
+++ b/src/main/cpp/gl/drawing.h
@@ -21,10 +21,6 @@
 
 GLAPI GLAPIENTRY void glMultiDrawElementsBaseVertex( GLenum mode, GLsizei *counts, GLenum type, const void * const *indices, GLsizei primcount, const GLint * basevertex);
 
-GLAPI GLAPIENTRY void glDrawBuffer(GLenum buf);
-
-GLAPI GLAPIENTRY void glDrawBuffers(GLsizei n, const GLenum *bufs);
-
 GLAPI GLAPIENTRY void glMultiDrawElements(GLenum mode,const GLsizei * count,GLenum type,const void * const * indices,GLsizei primcount);
 
 #endif //MOBILEGLUES_DRAWING_H
diff --git a/src/main/cpp/gl/framebuffer.c b/src/main/cpp/gl/framebuffer.c
index d180d06..cad4019 100644
--- a/src/main/cpp/gl/framebuffer.c
+++ b/src/main/cpp/gl/framebuffer.c
@@ -95,5 +95,74 @@ void glFramebufferTexture2D(GLenum target, GLenum attachment, GLenum textarget,
     LOAD_GLES(glFramebufferTexture2D, void, GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level)
     gles_glFramebufferTexture2D(target, attachment, textarget, texture, level);
 
+    CHECK_GL_ERROR
+}
+
+void glDrawBuffer(GLenum buffer) {
+    LOG()
+
+    LOAD_GLES(glDrawBuffers, void, GLsizei n, const GLenum *bufs)
+
+    GLint currentFBO;
+    glGetIntegerv(GL_FRAMEBUFFER_BINDING, &currentFBO);
+
+    if (currentFBO == 0) { // 默认帧缓冲
+        GLenum buffers[1] = {GL_NONE};
+        switch (buffer) {
+            case GL_FRONT:
+            case GL_BACK:
+            case GL_NONE:
+                buffers[0] = buffer;
+                gles_glDrawBuffers(1, buffers);
+                break;
+            default:
+                // 生成错误：GL_INVALID_ENUM
+                break;
+        }
+    } else { // FBO场景
+        GLint maxAttachments;
+        glGetIntegerv(GL_MAX_COLOR_ATTACHMENTS, &maxAttachments);
+
+        if (buffer == GL_NONE) {
+            GLenum *buffers = (GLenum *)alloca(maxAttachments * sizeof(GLenum));
+            for (int i = 0; i < maxAttachments; i++) {
+                buffers[i] = GL_NONE;
+            }
+            gles_glDrawBuffers(maxAttachments, buffers);
+        } else if (buffer >= GL_COLOR_ATTACHMENT0 &&
+                   buffer < GL_COLOR_ATTACHMENT0 + maxAttachments) {
+            GLenum *buffers = (GLenum *)alloca(maxAttachments * sizeof(GLenum));
+            for (int i = 0; i < maxAttachments; i++) {
+                buffers[i] = (i == (buffer - GL_COLOR_ATTACHMENT0)) ? buffer : GL_NONE;
+            }
+            gles_glDrawBuffers(maxAttachments, buffers);
+        } else {
+            // 生成错误：GL_INVALID_ENUM
+        }
+    }
+}
+
+void glDrawBuffers(GLsizei n, const GLenum *bufs) {
+    LOG()
+
+    LOG_D("glDrawBuffers(%d, %p), [0]=0x%x", n, bufs, n ? bufs[0] : 0)
+
+    GLenum new_bufs[n];
+
+    for (int i = 0; i < n; i++) {
+        if (bufs[i] >= GL_COLOR_ATTACHMENT0 && bufs[i] <= GL_COLOR_ATTACHMENT0 + getMaxDrawBuffers()) {
+            GLenum target_attachment = GL_COLOR_ATTACHMENT0 + i;
+            new_bufs[i] = target_attachment;
+            if (bufs[i] == target_attachment)
+                continue;
+            rebind_framebuffer(bufs[i], target_attachment);
+        } else {
+            new_bufs[i] = bufs[i];
+        }
+    }
+
+    LOAD_GLES(glDrawBuffers, void, GLsizei n, const GLenum *bufs)
+    gles_glDrawBuffers(n, new_bufs);
+
     CHECK_GL_ERROR
 }
\ No newline at end of file
diff --git a/src/main/cpp/gl/framebuffer.h b/src/main/cpp/gl/framebuffer.h
index c8207a6..ad56463 100644
--- a/src/main/cpp/gl/framebuffer.h
+++ b/src/main/cpp/gl/framebuffer.h
@@ -29,4 +29,8 @@ GLAPI GLAPIENTRY void glBindFramebuffer(GLenum target, GLuint framebuffer);
 
 GLAPI GLAPIENTRY void glFramebufferTexture2D(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
 
+GLAPI GLAPIENTRY void glDrawBuffer(GLenum buf);
+
+GLAPI GLAPIENTRY void glDrawBuffers(GLsizei n, const GLenum *bufs);
+
 #endif //MOBILEGLUES_FRAMEBUFFER_H