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View Full Version : Simple Question : What's the sequence of init GL,GLSL,and glut ?



Jedimaster
07-19-2006, 10:42 PM
In most of simple gl program,we can see the simple sequence ,glutCreateWindow,at last,there's,glutMainLoop().

In the glsl demo from 3dlabs, I found the "InstallShader" is before the glutMainLoop(),after the functions such as glutResharpFunc().That's It !

In my CRender class,

void CRender::InitOpenGL(const char* title, int Width,int Height, int argc,char** argv)
{
glutInit( &argc, argv );
glutInitDisplayMode( GLUT_RGB | GLUT_DEPTH | GLUT_DOUBLE);
glutInitWindowSize(Width, Height);
Window = glutCreateWindow(title);
glutReshapeFunc(ReshapeFunction);
glutIdleFunc(Play);
EnableDepthTest(GL_LESS);
glClearColor(0.0, 0.0, 0.0,1.0f);
glClearDepth(1.0f);
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LESS);
glShadeModel(GL_SMOOTH);
ASSERT( Window != 0 );
isGLInitOK = 1;
};


void CRender::SetupShader(const char* vs,const char* fs)
{
if( glewInit() != GLEW_OK ){
cout<<"glew Init Failed"<<endl;
}else{
cout<<"glew OK!"<<endl;
if (GLEW_ARB_shader_objects){
cout<<"Support Shading Language"<<endl;
Shader = new CShader;
Shader->InitShaders(vs,fs);
}
}
};In main.cpp


CRender* RC = new CRender();
RC->InitOpenGL("HopeOk",800,600,argc,argv);
CScene* S1 = new CScene(2);

CModel* M1 = new CSceneTransition();
CModel* M2 = new CStreamModel(64,1.0f);

S1->AddModel(M2);
S1->AddModel(M1);
RC->PushNewScene(S1);
RC->SetupShader("demo.vert","demo.frag");
RC->EnableShaders();
RC->MainLoop();
return 0;if all is above,it's ok,shaders works not completely correctly,but it's working.

if i move the " RC->SetupShader("demo.vert","demo.frag");
RC->EnableShaders();" after the RC->InitGL(),that's bad.

thanks for your explaination

Zengar
07-20-2006, 04:04 AM
What is your question?