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#include <gl/glew.h>
#include <GL/glut.h>
#include <GL/glext.h>
#include <iostream>
#include <fstream>
using namespace std;
GLuint fbID,texID;
// Affiche une teapot avec texID comme texture
void display()
{
GLfloat positionProperties[] = {-2.0f, -2.0f, 2.0f, 0.0f};
glLightfv( GL_LIGHT0, GL_POSITION, positionProperties);
glEnable(GL_LIGHTING);
glEnable(GL_DEPTH_TEST);
glViewport(0,0,512,512);
glClearColor(0,0,0,1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.,512/(float)512,0.1,100.);
glTranslatef(0.,0.,-2.);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glEnable(GL_TEXTURE_2D);
glEnable(GL_LIGHT0);
glutSolidTeapot(0.5);
glDisable(GL_LIGHT0);
glDisable(GL_TEXTURE_2D);
glutSwapBuffers();
}
// display pour creer texID
void display2()
{
GLfloat positionProperties[] = {2.0f, 4.0f, -2.0f, 0.0f};
glLightfv( GL_LIGHT0, GL_POSITION, positionProperties);
glEnable(GL_LIGHTING);
glEnable(GL_DEPTH_TEST);
glViewport(0,0,512,512);
glClearColor(1,1,1,1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.,512/(float)512,0.1,100.);
glTranslatef(0.,0.,-2.);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glEnable(GL_LIGHT0);
glutSolidTeapot(0.5);
glDisable(GL_LIGHT0);
}
void InitGLExtentions(void)
{
GLenum err = glewInit();
if (GLEW_OK != err)
{
char *s=(char*)glewGetErrorString(err);
cerr << s << endl;
}
}
void Init_FrameBufferObject()
{
// creation texture
glGenTextures(1, &texID);
glBindTexture(GL_TEXTURE_2D, texID);
glTexImage2D(GL_TEXTURE_2D,0,4,512,512,0,GL_RGBA,GL_FLOAT,NULL);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_REPEAT);
// creation frame buffer
glGenFramebuffersEXT(1, &fbID);
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, fbID);
glFramebufferTexture2DEXT(GL_FRAMEBUFFER_EXT, GL_COLOR_ATTACHMENT0_EXT, GL_TEXTURE_2D, texID, 0);
display2();
GLenum status;
status = (GLenum) glCheckFramebufferStatusEXT(GL_FRAMEBUFFER_EXT);
switch(status) {
case GL_FRAMEBUFFER_COMPLETE_EXT:
printf("Frame Buffer Object Supported and complete \n");
break;
case GL_FRAMEBUFFER_UNSUPPORTED_EXT:
printf("Unsupported framebuffer format\n");
break;
case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT_EXT:
printf("Framebuffer incomplete, missing attachment\n");
break;
case GL_FRAMEBUFFER_INCOMPLETE_DUPLICATE_ATTACHMENT_EXT:
printf("Framebuffer incomplete, duplicate attachment\n");
break;
case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT:
printf("Framebuffer incomplete, attached images must have same dimensions\n");
break;
case GL_FRAMEBUFFER_INCOMPLETE_FORMATS_EXT:
printf("Framebuffer incomplete, attached images must have same format\n");
break;
case GL_FRAMEBUFFER_INCOMPLETE_DRAW_BUFFER_EXT:
printf("Framebuffer incomplete, missing draw buffer\n");
break;
case GL_FRAMEBUFFER_INCOMPLETE_READ_BUFFER_EXT:
printf("Framebuffer incomplete, missing read buffer\n");
break;
default:
break;
}
glBindFramebufferEXT(GL_FRAMEBUFFER_EXT, 0);
}
void init_GLUT(int argc, char ** argv){
glutInit(&argc, argv);
glutInitDisplayMode( GLUT_DOUBLE | GLUT_RGBA |GLUT_DEPTH );
glutInitWindowSize(512,512 );
glutCreateWindow("test fbo");
printf("%s\n", glGetString(GL_VENDOR));
printf("%s\n", glGetString(GL_RENDERER));
printf("OpenGL %s\n", glGetString(GL_VERSION));
glutDisplayFunc(display);
}
int main(int argc,char **argv)
{
init_GLUT(argc,argv);
InitGLExtentions();
Init_FrameBufferObject();
glutMainLoop();
} |
