Resizing window using SDL and OpenGL - opengl

Question

Before writing this question, I have read the question: Handling window resizing using OpenGL and SDL. However that question does not solve my problem, since I am using SDL2 and not SDL1.2. But I do use OpenGL2. My complete source code is available at: http://dpaste.com/17BVBP6
I am writing a program that displays a white square in the window. However I am having trouble while handling window resize events.Here is my resize function:
void resize(int width,int height)
{
if(height<=0) height=1;
glViewport(0,0,(GLsizei)width,(GLsizei)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.0f,float(width)/float(height),1.0f,100.0f);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
My Main event loop:
while( !quit )
{
while( SDL_PollEvent( &e ) != 0 )
{
switch (e.type) {
case SDL_QUIT:
quit=true;
break;
case SDL_WINDOWEVENT_SIZE_CHANGED:
resize(e.window.data1,e.window.data2);
break;
case SDL_KEYDOWN:
switch (e.key.keysym.sym) {
case SDLK_ESCAPE:
quit=true;
break;
default:
break;
}
default:
break;
}
}
render();
update(gWindow);
}
Here is my window when it is not resized:
Here is my window when it is resized:
What is the causing the problem here??

Answer 1

SDL_WINDOWEVENT_SIZE_CHANGED is not an event type, it is variation of SDL_WINDOWEVENT. Your event checking should be like
switch(e.type) {
case SDL_WINDOWEVENT:
if(e.window.event == SDL_WINDOWEVENT_SIZE_CHANGED) {
resize(e.window.data1,e.window.data2);
}
break;
Also remove your perspective projection setting - it is inconsistend with your draw, and you don't have perspective setup before resize.