Messages

1

General / Re: Trying to render a texture with opengl in a SFML application

« on: June 30, 2024, 04:58:26 pm »

Thank you fallahn! It worked, do you have any suggesions for an aspiring shader programmer who wants to learn the basics? I have previous knowledge about HLSL but GLSL is brand new to me

2

General / Trying to render a texture with opengl in a SFML application

« on: June 30, 2024, 01:06:52 pm »

I am trying to render a texture through a fragment shader to a SFML rectangle, but all I get is white color instead of the rendered texture.

here is the main file, which sets up a sfml window and prepare a sfml rectangle and shader:

#include <SFML/Graphics.hpp>
#include <iostream>

int main() {
    sf::RenderWindow window(sf::VideoMode(800, 600), "SFML Shader Test");
    window.setFramerateLimit(60);

    // Load texture
    sf::Texture texture;
    if (!texture.loadFromFile("n10249.jpg")) {
        std::cerr << "Failed to load texture" << std::endl;
        return -1;
    }

    // Load shader
    sf::Shader shader;
    if (!shader.loadFromFile("fragment_shader.frag", sf::Shader::Fragment)) {
        std::cerr << "Failed to load shader." << std::endl;
        return -1;
    }

    shader.setUniform("texture0", texture); // Set the texture uniform

    // Create rectangle and set texture
    sf::RectangleShape rect(sf::Vector2f(window.getSize().x, window.getSize().y));
    rect.setTexture(&texture);  // Set texture to rectangle

    while (window.isOpen()) {
        sf::Event event;
        while (window.pollEvent(event)) {
            if (event.type == sf::Event::Closed)
                window.close();
        }

        window.clear();
        window.draw(rect, &shader); // Draw rectangle with shader
        window.display();
    }

    return 0;
}

and here is the fragment shader:

#version 330 core
in vec2 TexCoords;
out vec4 FragColor;

uniform sampler2D texture0;

void main() {
    vec4 texColor = texture(texture0, TexCoords);
    FragColor = texColor; // Directly output the texture color
}