Messages

1

Graphics / Re: SFML 2.4 (RenderWindow) + GLEW2 + sfimGUI + opengl 3.3 context problems

« on: December 30, 2016, 01:43:18 am »

Ok, It works!
I solved it this way:
1. I moved GLEW initializing before imgui
2. window.setActive() before imgui
3. some gl state push/pop

Here is the code:

#define GLEW_STATIC
#include "GL/glew.h"

#include "include/imgui/imgui.h"
#include "include/imgui/imgui-SFML.h"

#include "my_gl_warappers.hpp"

#include <SFML/Graphics.hpp>

#include <iostream>
#include <cstdio>

using namespace std;

std::vector<GLfloat> cube_Pos = {...}

int main(){
    sf::ContextSettings settings;
    settings.majorVersion = 3;
    settings.minorVersion = 3;
    sf::RenderWindow window(sf::VideoMode(640, 480), "sf_glew",sf::Style::Default, settings);
    window.setFramerateLimit(60);

    window.setActive();
    glewExperimental=GL_TRUE;
    GLenum x = glewInit();

    ImGui::SFML::Init(window);
    window.resetGLStates();
    window.pushGLStates();

    chaos::ShaderProgram sh1({std::make_pair("chaos/files/shaders/shader2.vs", GL_VERTEX_SHADER),
                    std::make_pair("chaos/files/shaders/shader2.fs", GL_FRAGMENT_SHADER)});
    chaos::VertexArray vao(3, 0, 2, 0, &cube_Pos);

    sf::Clock deltaClock;
    while(window.isOpen()){
        sf::Event event;
        while(window.pollEvent(event)){
            ImGui::SFML::ProcessEvent(event);
            if(event.type == sf::Event::Closed ){
                window.close();
                return 0;
            }
            if(event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::Escape) {
                window.close();
                return 0;
            }
        }
        ImGui::SFML::Update(window, deltaClock.restart());
        ImGui::Begin("text input test");
        ImGui::Button("plz work");
        ImGui::End();

        window.clear();
        window.popGLStates();
        ImGui::Render();
        window.pushGLStates();
        sh1.run();
        sh1.setUniform("uniColor", glm::vec4(1.0f, 0.0f, 0.5f, 1.0f));
        sh1.setUniform("mx",glm::mat4());
        vao.bind();
        glDrawArrays(GL_TRIANGLES, 0, vao.countVertices());
        vao.unbind();
        glUseProgram(0);

        window.display();
    }
    ImGui::SFML::Shutdown();
    return 0;
}
 

Thanks exploit3r

It was SFML 2.3.2 not 2.4 i made a thinko or typo in title

By the way: how expensive are gl push/pop in execution time?

2

Graphics / SFML 2.3.2 (RenderWindow) + GLEW2 + sfimGUI + opengl 3.3 context problems

« on: December 27, 2016, 03:28:07 pm »

Hi!
I have hard time connecting all libraries.
sfimgui -> https://github.com/eliasdaler/imgui-sfml
I can use both RenderWindow + GLEW2 (it renders a simple rectangle), but whenever i add ImGui::SFML::Init it stops rendering my rectangle and displays following messages:

An internal OpenGL call failed in Texture.cpp(563).
Expression:
   glBindTexture(GL_TEXTURE_2D, 0)
Error description:
   GL_INVALID_OPERATION
   The specified operation is not allowed in the current state.

I've also tried changing glew2 to glad, but integrating imgui still fails

My code (shortened) looks this way:

#define GLEW_STATIC
#include "GL/glew.h"
#include "include/imgui/imgui.h"
#include "include/imgui/imgui-SFML.h"

#include "my_opengl_wrapper.hpp"                        //vao & shader loader
#include <SFML/Graphics.hpp>

std::vector<GLfloat> cube_Pos = {...};     //my rect vertices

//prints version of opengl
void getOpenglVersion(){
    int v1=31337, v2=1337;
    glGetIntegerv(GL_MAJOR_VERSION, &v1);
    glGetIntegerv(GL_MINOR_VERSION, &v2);
    std::cout << "versions (imGUI): " << v1 << " " << v2 << "\n";
}

int main(){
    sf::ContextSettings settings;
    settings.majorVersion = 3;
    settings.minorVersion = 3;
    sf::RenderWindow window(sf::VideoMode(1280, 720), "sf_glew", sf::Style::Default, settings);
    getOpenglVersion();                         //prints 3 3
    ImGui::SFML::Init(window);          //this causes all problems, root of all evil
    getOpenglVersion();                         //prints 4 0, if ImGui::SFML::Init is commented it prints 3 3
    glewExperimental=GL_TRUE;
    if(glewInit() == GLEW_OK)
        std::cout << "ok! " << x << "\n";
   getOpenglVersion();                          //prints 4 0, if ImGui::SFML::Init is commented it prints 3 3

        //my sh1 and vao loaders, it works great
    chaos::ShaderProgram sh1({std::make_pair("chaos/files/shaders/shader2.vs", GL_VERTEX_SHADER),
                    std::make_pair("chaos/files/shaders/shader2.fs", GL_FRAGMENT_SHADER)});
    chaos::VertexArray vao(3, 0, 2, 0, &cube_Pos);

    while(window.isOpen()){
        window.clear(sf::Color::Green);
        sf::Event event;
        while(window.pollEvent(event)){
            if(event.type == sf::Event::Closed ){
                window.close();
                return 0;
            }
            if(event.type == sf::Event::KeyPressed && event.key.code == sf::Keyboard::Escape) {
                window.close();
                return 0;
            }
        }
                //this all works as expected if imgui isn't enabled
        sh1.run();
        sh1.setUniform("uniColor", glm::vec4(1.0f, 0.0f, 0.5f, 1.0f));
        sh1.setUniform("mx",glm::mat4());
        vao.bind();
        glDrawArrays(GL_TRIANGLES, 0, vao.countVertices());
        vao.unbind();
        glUseProgram(0);

        window.display();
    }
    return 0;
}

 

I have to add that if i use only sfml2(RenderWindow) + imgui then it works, also sfml2(RenderWindow) + glew works fine, the problem is in using all three at once.