diff --git a/renderbuffer.cpp b/renderbuffer.cpp
new file mode 100644
index 00000000..24f86a00
--- /dev/null
+++ b/renderbuffer.cpp
@@ -0,0 +1,152 @@
+#if !CAP_GLEW
+#if ISLINUX
+extern "C" {
+GLAPI void APIENTRY glGenFramebuffers (GLsizei n, GLuint *framebuffers);
+GLAPI void APIENTRY glBindFramebuffer (GLenum target, GLuint framebuffer);
+GLAPI void APIENTRY glFramebufferTexture (GLenum target, GLenum attachment, GLuint texture, GLint level);
+GLAPI GLenum APIENTRY glCheckFramebufferStatus (GLenum target);
+GLAPI void APIENTRY glDrawBuffers (GLsizei n, const GLenum *bufs);
+GLAPI void APIENTRY glGenRenderbuffers (GLsizei n, GLuint *renderbuffers);
+GLAPI void APIENTRY glBindRenderbuffer (GLenum target, GLuint renderbuffer);
+GLAPI void APIENTRY glRenderbufferStorage (GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
+GLAPI void APIENTRY glFramebufferRenderbuffer (GLenum target, GLenum attachment, GLenum renderbuffertarget, GLuint renderbuffer);
+GLAPI void APIENTRY glDeleteRenderbuffers (GLsizei n, const GLuint *renderbuffers);
+GLAPI void APIENTRY glDeleteFramebuffers (GLsizei n, const GLuint *framebuffers);
+}
+#endif
+
+#if ISMAC
+#define glFramebufferTexture glFramebufferTextureEXT 
+#endif
+#endif
+
+renderbuffer::renderbuffer(int x, int y, bool gl) : x(x), y(y) {
+
+  FramebufferName = renderedTexture = depth_stencil_rb = 0;
+  srf = NULL; expanded_data = NULL;
+
+  if(gl) {
+    tx = next_p2(x);
+    ty = next_p2(y);
+    s = NULL;
+  #if CAP_GLEW
+    if(!glew) { 
+      glew = true; 
+      GLenum err = glewInit();
+      if (GLEW_OK != err) {
+        addMessage("Failed to initialize GLEW");
+        return;
+        }
+      }
+  #endif
+  
+    FramebufferName = renderedTexture = depth_stencil_rb = 0;
+    glGenFramebuffers(1, &FramebufferName);
+    glBindFramebuffer(GL_FRAMEBUFFER, FramebufferName);
+    
+    glGenTextures(1, &renderedTexture);
+    glBindTexture(GL_TEXTURE_2D, renderedTexture);
+    glTexImage2D(GL_TEXTURE_2D, 0,GL_RGB, tx, ty, 0,GL_RGB, GL_UNSIGNED_BYTE, 0);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+  
+  #ifdef TEX
+    glFramebufferTexture(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, renderedTexture, 0);  
+  #else
+    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, renderedTexture, 0);  
+  #endif
+    GLenum DrawBuffers[1] = {GL_COLOR_ATTACHMENT0};
+    glDrawBuffers(1, DrawBuffers);
+    
+    glGenRenderbuffers(1, &depth_stencil_rb);
+    glBindRenderbuffer(GL_RENDERBUFFER, depth_stencil_rb);
+    glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, tx, ty);
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, depth_stencil_rb);
+    glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, depth_stencil_rb);
+    
+    if(glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+      FramebufferName = renderedTexture = 0;
+    }
+  
+  if(!FramebufferName)
+    make_surface();
+  }
+
+void renderbuffer::make_surface() {
+  if(!srf)
+    srf = SDL_CreateRGBSurface(SDL_SWSURFACE, x, y, 32,0xff0000,0xff00,0xff,0xff000000);
+  }
+  
+void renderbuffer::enable() {
+  if(FramebufferName) {
+    glBindFramebuffer(GL_FRAMEBUFFER, FramebufferName);
+    glViewport(0,0,x,y);
+    vid.usingGL = true;
+    }
+  else {
+    make_surface();
+    s = srf;
+    vid.usingGL = false;
+    }
+  }
+
+void renderbuffer::use_as_texture() {
+  if(!renderedTexture) {
+    glGenTextures( 1, &renderedTexture);
+    glBindTexture( GL_TEXTURE_2D, renderedTexture);
+    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR);
+    glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR);
+    }
+  if(FramebufferName) {
+    glBindTexture( GL_TEXTURE_2D, renderedTexture);
+    }
+  else {
+    if(!expanded_data)
+      expanded_data = new Uint32[tx * ty];
+    for(int y=0; y<ty; y++) for(int x=0; x<tx; x++)
+      expanded_data[y*tx + x] = qpixel(srf, x, ty-1-y) | 0xFF000000;
+    glBindTexture( GL_TEXTURE_2D, renderedTexture);
+    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, tx, ty, 0, GL_BGRA, GL_UNSIGNED_BYTE, expanded_data );    
+    }
+  }
+
+void renderbuffer::disable() {
+  if(FramebufferName) {
+    glBindFramebuffer(GL_FRAMEBUFFER, 0);
+    glViewport(0,0,s_screen->w,s_screen->h);
+    }
+  else {
+    s = s_screen;
+    }
+  }
+  
+renderbuffer::~renderbuffer() {
+  if(renderedTexture)
+    glDeleteTextures(1, &renderedTexture);
+  if(FramebufferName) {
+    glDeleteRenderbuffers(1, &depth_stencil_rb);
+    glDeleteFramebuffers(1, &FramebufferName);
+    }
+  if(srf) 
+    SDL_FreeSurface(srf);
+  if(expanded_data)
+    delete[] expanded_data;
+  }
+
+SDL_Surface *renderbuffer::render() {
+  make_surface();
+  if(FramebufferName) {
+    glReadPixels(0, 0, vid.xres, vid.yres, GL_BGRA, GL_UNSIGNED_BYTE, srf->pixels);
+    for(int y=0; y<vid.yres/2; y++)
+    for(int x=0; x<vid.xres; x++)
+      swap(qpixel(srf,x,y), qpixel(srf,x,vid.yres-1-y));
+    }
+  return srf;
+  }
+
+void renderbuffer::clear(int col) {
+  if(FramebufferName)
+    setGLProjection(0);
+  else
+    SDL_FillRect(srf, NULL, col);
+  }