fbotest.c

#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <assert.h>
#include <stdio.h>

void main( )
{
    //Window init
    assert( glfwInit( ) == GLFW_TRUE );
    glfwWindowHint( GLFW_SAMPLES, 1 );
    glfwWindowHint( GLFW_CONTEXT_VERSION_MAJOR, 4 );
    glfwWindowHint( GLFW_CONTEXT_VERSION_MINOR, 5 );
    glfwWindowHint( GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE );
    glfwWindowHint( GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE );
    GLFWwindow *window = glfwCreateWindow( 800, 600, "FBO test", NULL, NULL );
    assert( window != NULL );
    glfwMakeContextCurrent( window );
    glewExperimental = GL_TRUE;
    assert( glewInit( ) == GLEW_OK );

    //Create textures
    GLuint tex[2];
    glCreateTextures( GL_TEXTURE_2D, 2, tex );
    glTextureStorage2D( tex[0], 1, GL_RGB8, 2048, 2048 );
    glTextureStorage2D( tex[1], 1, GL_RGB8, 1024, 1024 );

    //Create FBO
    GLuint fbo;
    glCreateFramebuffers( 1, &fbo );
    glNamedFramebufferTexture( fbo, GL_COLOR_ATTACHMENT0, tex[0], 0 );
    glNamedFramebufferTexture( fbo, GL_COLOR_ATTACHMENT1, tex[1], 0 );

    //Check completeness
    GLenum comp = glCheckNamedFramebufferStatus( fbo, GL_FRAMEBUFFER );
    if ( comp != GL_FRAMEBUFFER_COMPLETE )
    {
        printf( "0x%x\n", comp );
        printf( "0x%x - GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT\n", GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT );
        assert( comp != GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS_EXT );
    }
}