c++ - GLUT is just rendering a blank white screen? -


here code, there aren't errors, wrong it?

i compile it, command prompt opens, window opens, window white, recolored grey.., , not draw shape, problem?

    #ifdef __apple__     #include <glut/glut.h>     #else     #include <gl/glut.h>     #endif      #include <stdlib.h>        void processspecialkeys(int key, int x, int y){          switch(key){             case glut_key_right:       exit(0);               case glut_key_left:      exit(0);             case glut_key_up:     exit(0);             case glut_key_down:      exit(0);            default:      exit(0);          }             }        void renderscene(void) {     glclearcolor(0.3f, 0.3f, 0.3f, 0.3f);     glclear(gl_color_buffer_bit | gl_depth_buffer_bit);           glutswapbuffers(); }      void renderprimitive(void){     glbegin(gl_quads);     glvertex3f(-1.0f,-1.0f,0.0f);     glvertex3f(-1.0f,1.0f,0.0f);     glvertex3f(1.0f,1.0f,0.0f);     glvertex3f(1.0f,-1.0f,0.0f);     glend(); }      void display(void){     gltranslatef(0.0f,0.0f,-0.5f);     renderprimitive();     glflush();     glclearcolor(0.3f,0.3f,0.3f,0.3f);     glclear(gl_color_buffer_bit); }  int main(int argc, char **argv) {      glutinit(&argc, argv);     glutinitdisplaymode(glut_depth | glut_double | glut_rgba);     glutinitwindowposition(100,100);     glutinitwindowsize(320,320);     glutcreatewindow("dimension");     glutdisplayfunc(display);      glloadidentity();  glutspecialfunc(processspecialkeys);       glutmainloop();      return 1; }

the problem clearing display after draw scene in display function. also, there useless glflush() call. remove these lines:

glflush(); glclearcolor(0.3f,0.3f,0.3f,0.3f); glclear(gl_color_buffer_bit);

add glutswapbuffers() instead of them.

glflush() used in single buffered mode.

remember, using double buffered mode, there 2 buffers. scene drawn buffer, , display it, have copy front buffer calling glutswapbuffers() @ end of display function.


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