Hello,
This is maybe easy to achieve but (as I just started learning Graphics Programming) I couldn't manage to get it working as intended.
So I have a red rectangle rendered via a vertex array :
Now I want to draw on top of it a texture (white question mark with transparent background) using "textCoord" :
so the final result would be like this :
But this is what I get instead:
I assume this because SFML infernally multiplies the texture's pixels by the vertices' colors. If that's true, how can I change the blend mode used to draw the rectangle? And what's the appropriate mode to use in this case?
Thank you in advance.
PS: Here is a minimal code ("questionMark.png" is attached to this post):
int main()
{
sf::RenderWindow window(sf::VideoMode(400, 240), "My window");
sf::Texture texture;
if (!texture.loadFromFile("questionMark.png"))
{
// error...
}
// create an array of 4 vertices that define a quad primitive
sf::VertexArray quad(sf::Quads, 4);
// define the position of the quad's points
quad[0].position = sf::Vector2f(10, 10);
quad[1].position = sf::Vector2f(100, 10);
quad[2].position = sf::Vector2f(100, 100);
quad[3].position = sf::Vector2f(10, 100);
// define the color of the quad's points
quad[0].color = sf::Color::Red;
quad[1].color = sf::Color::Red;
quad[2].color = sf::Color::Red;
quad[3].color = sf::Color::Red;
// define its texture area
quad[0].texCoords = sf::Vector2f(0, 0);
quad[1].texCoords = sf::Vector2f(8, 0);
quad[2].texCoords = sf::Vector2f(8, 8);
quad[3].texCoords = sf::Vector2f(0, 8);
// define the render states
sf::RenderStates states;
//states.blendMode = ???;
states.texture = &texture;
// run the program as long as the window is open
while (window.isOpen())
{
// check all the window's events that were triggered since the last iteration of the loop
sf::Event event;
while (window.pollEvent(event))
{
// "close requested" event: we close the window
if (event.type == sf::Event::Closed)
window.close();
}
// clear the window with black color
window.clear(sf::Color::Black);
// draw everything here...
window.draw(quad, states);
// end the current frame
window.display();
}
return 0;
}
