diff --git a/MG/MG_GL/Implementations/GL/Drawing/GL_Drawing.cpp b/MG/MG_GL/Implementations/GL/Drawing/GL_Drawing.cpp
index e06f2f55..865e62cc 100644
--- a/MG/MG_GL/Implementations/GL/Drawing/GL_Drawing.cpp
+++ b/MG/MG_GL/Implementations/GL/Drawing/GL_Drawing.cpp
@@ -1004,8 +1004,4 @@ namespace MG_GL::GL {
 //        MG_Diligent::IsInRenderPass = false;
         MG_Util::Debug::LogD("MultiDrawIndexed completed.");
     }
-
-    void DrawBuffer(GLenum buf) {
-        // TODO
-    }
 }
\ No newline at end of file
diff --git a/MG/MG_GL/Implementations/GL/Drawing/GL_Drawing.h b/MG/MG_GL/Implementations/GL/Drawing/GL_Drawing.h
index 6495fc92..3a2e4df6 100644
--- a/MG/MG_GL/Implementations/GL/Drawing/GL_Drawing.h
+++ b/MG/MG_GL/Implementations/GL/Drawing/GL_Drawing.h
@@ -16,7 +16,6 @@ namespace MG_GL::GL {
     void DrawElementsBaseVertex(GLenum mode, GLsizei count, GLenum type, const GLvoid *indices, GLint basevertex);
     void MultiDrawElements(GLenum mode, const GLsizei *count, GLenum type, const GLvoid *const *indices, GLsizei drawcount);
     void MultiDrawElementsBaseVertex(GLenum mode, const GLsizei *count, GLenum type, const GLvoid *const *indices, GLsizei drawcount, const GLint *basevertex);
-    void DrawBuffer(GLenum buf);
 }
 
 #endif //MOBILEGL_GL_DRAWING_H
diff --git a/MG/MG_GL/Implementations/GL/Framebuffer/GL_Framebuffer.cpp b/MG/MG_GL/Implementations/GL/Framebuffer/GL_Framebuffer.cpp
index db2a438f..7b86794c 100644
--- a/MG/MG_GL/Implementations/GL/Framebuffer/GL_Framebuffer.cpp
+++ b/MG/MG_GL/Implementations/GL/Framebuffer/GL_Framebuffer.cpp
@@ -582,4 +582,22 @@ namespace MG_GL::GL {
             MG_Diligent::g_pContext->CopyTexture(CopyAttribs);
         }
     }
+
+    void DrawBuffer(GLenum buf) {
+        MG_Util::Debug::LogD("glDrawBuffer, buf: %s", MG_Util::Debug::GLEnumToString(buf));
+    }
+
+    void DrawBuffers(GLsizei n, const GLenum *bufs) {
+        MG_Util::Debug::LogD("glDrawBuffers, n: %d, bufs: [", n);
+        for (int i = 0; i < n; ++i) {
+            MG_Util::Debug::LogD("%s,", MG_Util::Debug::GLEnumToString(bufs[i]));
+        }
+        MG_Util::Debug::LogD("]");
+
+    }
+
+    void ReadBuffer(GLenum buf) {
+        MG_Util::Debug::LogD("glReadBuffer, buf: %s", MG_Util::Debug::GLEnumToString(buf));
+
+    }
 }
diff --git a/MG/MG_GL/Implementations/GL/Framebuffer/GL_Framebuffer.h b/MG/MG_GL/Implementations/GL/Framebuffer/GL_Framebuffer.h
index 30a38fb1..409b612e 100644
--- a/MG/MG_GL/Implementations/GL/Framebuffer/GL_Framebuffer.h
+++ b/MG/MG_GL/Implementations/GL/Framebuffer/GL_Framebuffer.h
@@ -16,6 +16,9 @@ namespace MG_GL::GL {
     void FramebufferTexture2D(GLenum target, GLenum attachment, GLenum textarget, GLuint texture, GLint level);
     GLenum CheckFramebufferStatus(GLenum target);
     void BlitFramebuffer(GLint srcX0, GLint srcY0, GLint srcX1, GLint srcY1, GLint dstX0, GLint dstY0, GLint dstX1, GLint dstY1, GLbitfield mask, GLenum filter);
+    void DrawBuffer(GLenum buf);
+    void DrawBuffers(GLsizei n, const GLenum *bufs);
+    void ReadBuffer(GLenum mode);
 }
 
 #endif //MOBILEGL_GL_FRAMEBUFFER_H
diff --git a/MG/MG_GL/Implementations/GL/GLFuncsDefinitions/GLFuncsDefinitions.cpp b/MG/MG_GL/Implementations/GL/GLFuncsDefinitions/GLFuncsDefinitions.cpp
index 9e747e80..90ad8def 100644
--- a/MG/MG_GL/Implementations/GL/GLFuncsDefinitions/GLFuncsDefinitions.cpp
+++ b/MG/MG_GL/Implementations/GL/GLFuncsDefinitions/GLFuncsDefinitions.cpp
@@ -57,7 +57,7 @@ DECLARE_GL_FUNCTION_HEAD(void, CompileShader, GLuint shader) DECLARE_GL_FUNCTION
 DECLARE_GL_FUNCTION_STUB_HEAD(void, CompressedTexImage2D, GLenum target, GLint level, GLenum internalformat, GLsizei width, GLsizei height, GLint border, GLsizei imageSize, const void *data) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, CompressedTexImage2D, target,level,internalformat,width,height,border,imageSize,data)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, CompressedTexSubImage2D, GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLsizei imageSize, const void *data) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, CompressedTexSubImage2D, target,level,xoffset,yoffset,width,height,format,imageSize,data)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, CopyTexImage2D, GLenum target, GLint level, GLenum internalformat, GLint x, GLint y, GLsizei width, GLsizei height, GLint border) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, CopyTexImage2D, target,level,internalformat,x,y,width,height,border)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, CopyTexSubImage2D, GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, CopyTexSubImage2D, target,level,xoffset,yoffset,x,y,width,height)
+DECLARE_GL_FUNCTION_STUB_HEAD(void, CopyTexSubImage2D, GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height) DECLARE_GL_FUNCTION_END_NO_RETURN(void, CopyTexSubImage2D, target,level,xoffset,yoffset,x,y,width,height)
 DECLARE_GL_FUNCTION_HEAD(GLuint, CreateProgram) DECLARE_GL_FUNCTION_END(GLuint, CreateProgram)
 DECLARE_GL_FUNCTION_HEAD(GLuint, CreateShader, GLenum type) DECLARE_GL_FUNCTION_END(GLuint, CreateShader, type)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, CullFace, GLenum mode) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, CullFace, mode)
@@ -174,7 +174,7 @@ DECLARE_GL_FUNCTION_STUB_HEAD(void, VertexAttrib4f, GLuint index, GLfloat x, GLf
 DECLARE_GL_FUNCTION_STUB_HEAD(void, VertexAttrib4fv, GLuint index, const GLfloat *v) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, VertexAttrib4fv, index,v)
 DECLARE_GL_FUNCTION_HEAD(void, VertexAttribPointer, GLuint index, GLint size, GLenum type, GLboolean normalized, GLsizei stride, const void *pointer) DECLARE_GL_FUNCTION_END_NO_RETURN(void, VertexAttribPointer, index,size,type,normalized,stride,pointer)
 DECLARE_GL_FUNCTION_HEAD(void, Viewport, GLint x, GLint y, GLsizei width, GLsizei height) DECLARE_GL_FUNCTION_END_NO_RETURN(void, Viewport, x,y,width,height)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, ReadBuffer, GLenum src) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, ReadBuffer, src)
+DECLARE_GL_FUNCTION_STUB_HEAD(void, ReadBuffer, GLenum src) DECLARE_GL_FUNCTION_END_NO_RETURN(void, ReadBuffer, src)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, DrawRangeElements, GLenum mode, GLuint start, GLuint end, GLsizei count, GLenum type, const void *indices) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, DrawRangeElements, mode,start,end,count,type,indices)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, TexImage3D, GLenum target, GLint level, GLint internalformat, GLsizei width, GLsizei height, GLsizei depth, GLint border, GLenum format, GLenum type, const void *pixels) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, TexImage3D, target,level,internalformat,width,height,depth,border,format,type,pixels)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, TexSubImage3D, GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint zoffset, GLsizei width, GLsizei height, GLsizei depth, GLenum format, GLenum type, const void *pixels) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, TexSubImage3D, target,level,xoffset,yoffset,zoffset,width,height,depth,format,type,pixels)
@@ -190,7 +190,7 @@ DECLARE_GL_FUNCTION_STUB_HEAD(void, GetQueryiv, GLenum target, GLenum pname, GLi
 DECLARE_GL_FUNCTION_STUB_HEAD(void, GetQueryObjectuiv, GLuint id, GLenum pname, GLuint *params) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetQueryObjectuiv, id,pname,params)
 DECLARE_GL_FUNCTION_HEAD(GLboolean, UnmapBuffer, GLenum target) DECLARE_GL_FUNCTION_END(GLboolean, UnmapBuffer, target)
 DECLARE_GL_FUNCTION_STUB_HEAD(void, GetBufferPointerv, GLenum target, GLenum pname, void **params) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, GetBufferPointerv, target,pname,params)
-DECLARE_GL_FUNCTION_STUB_HEAD(void, DrawBuffers, GLsizei n, const GLenum *bufs) DECLARE_GL_FUNCTION_STUB_END_NO_RETURN(void, DrawBuffers, n,bufs)
+DECLARE_GL_FUNCTION_STUB_HEAD(void, DrawBuffers, GLsizei n, const GLenum *bufs) DECLARE_GL_FUNCTION_END_NO_RETURN(void, DrawBuffers, n,bufs)
 DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix2x3fv, GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix2x3fv, location,count,transpose,value)
 DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix3x2fv, GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix3x2fv, location,count,transpose,value)
 DECLARE_GL_FUNCTION_HEAD(void, UniformMatrix2x4fv, GLint location, GLsizei count, GLboolean transpose, const GLfloat *value) DECLARE_GL_FUNCTION_END_NO_RETURN(void, UniformMatrix2x4fv, location,count,transpose,value)
diff --git a/MG/MG_GL/Implementations/GL/Texture/GL_Texture.cpp b/MG/MG_GL/Implementations/GL/Texture/GL_Texture.cpp
index 0b63c87a..8c6fd1c6 100644
--- a/MG/MG_GL/Implementations/GL/Texture/GL_Texture.cpp
+++ b/MG/MG_GL/Implementations/GL/Texture/GL_Texture.cpp
@@ -689,4 +689,10 @@ namespace MG_GL::GL {
         MG_State::SetError(result);
         MG_Util::Debug::LogE("Error from MG State: %s", MG_Util::Debug::GLEnumToString(result));
     }
+
+    void CopyTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height) {
+        MG_Util::Debug::LogD("glCopyTexSubImage2D, target: %d, level: %d, xoffset: %d, yoffset: %d, x: %d, y: %d, width: %d, height: %d",
+                             target, level, xoffset, yoffset, x, y, width, height);
+
+    }
 }
diff --git a/MG/MG_GL/Implementations/GL/Texture/GL_Texture.h b/MG/MG_GL/Implementations/GL/Texture/GL_Texture.h
index 58ff7974..7412ae28 100644
--- a/MG/MG_GL/Implementations/GL/Texture/GL_Texture.h
+++ b/MG/MG_GL/Implementations/GL/Texture/GL_Texture.h
@@ -17,6 +17,7 @@ namespace MG_GL::GL {
     void TexParameteri(GLenum target, GLenum pname, GLint param);
     void TexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLsizei width, GLsizei height, GLenum format, GLenum type, const void* pixels);
     void GetTexLevelParameteriv(GLenum target, GLint level, GLenum pname, GLint* params);
+     void CopyTexSubImage2D(GLenum target, GLint level, GLint xoffset, GLint yoffset, GLint x, GLint y, GLsizei width, GLsizei height);
 }
 
 #endif //MOBILEGL_GL_TEXTURE_H