Topics

1

Window / [SOLVED] Problem handling multiple key stroke

« on: May 13, 2024, 03:42:05 pm »

Hello everyone,
Its been a one year journey with SFML and everything has been great but i am facing a weird bug with inputs.
I am building a game so i have a HandleInput method in which i poll every event but when i am stroking 5 keys at the same time i get nothing (i tried to detect keyboard input using sf::Keyboard::isKeyPressed and by sf::Event.type and get the same bug)

Here is how i handle my event, this function is called by the main loop with 2 main functions, update and draw

sf::Event event;
while (data->window.pollEvent(event))
{
        if (sf::Event::Closed == event.type)
                data->window.close();
        else if (event.type == sf::Event::KeyPressed)
        {
                if (event.key.code == inputOfPlayers[0].moveUp)
                {
                        //do things
                }
                else if (event.key.code == inputOfPlayers[0].moveDown)
                {
                        //do other things
                }
        }
}

I am building a local multiplayer game so this error bother me a bit, i don't know how can i solve this ?
Thanks for reading this and lmk if i didnt make this clear enough

2

Graphics / [SOLVED] Using shader to apply fake 3D rotation effect on a sf::Text

« on: May 12, 2024, 11:17:42 pm »

Hello everyone,
i am working on a game project and i face difficulties understanding how to use shader on sf::Text.
What i wanted to do is in the title and i dont realize if this is possible or not. I wanted to spin a text to have a fake 3D rotation effect. I Found a shader that does the spin effect in shadertoy and adapt it  :
.frag

precision mediump float;

#define Mouse_Rotation ( Max_Rotation - Max_Rotation * 2.0 * (iMouse.xy / iResolution.xy) )
#define RotationCenter vec3(0.000, 0.000, 0.000)
#define Max_Rotation 0.65

/*
   A simple rotating effect of a textured plane in 3D space.
   I'm basically using a ray for each pixel that intersects the plane
   as drawn in a 2D view below.

   Created By Jaap Boerhof (Dec. 2017)
   Forked by yohjimane (Jul. 2023)

   Positioning                             Positioning at a certain angle:
   at zero degrees rotation:
   
   |------plane-----|  coords:                              __--|
   \                /  (-1.0..1.0, 0.0)                 __--   /  
    \              /                                __--      /  
     \            /                             __--         /
      \          /                         \ _--            /  
       \        /                          |\              /  
        \      /                             \            /    
         \    /                               \          /      
          \  /                                 \        /      
           \/          Camera                   \      /  
                       position                  \    /  
                       at (0.0, -1.0)             \  /
                                                   \/
*/
uniform vec2 u_resolution;
uniform float u_time;
uniform sampler2D texture;
vec2 rotate(vec2 v, vec2 o, float a) {
    float s = sin(a);
    float c = cos(a);
    mat2 m = mat2(c, -s, s, c);
    return m * (v-o) + o;
}

vec3 rotateZ(vec3 v, vec3 o, float a) {
    float s = sin(a);
    float c = cos(a);
    mat2 m = mat2(c, -s, s, c);
    return vec3(m * (v.xy - o.xy) + o.xy, v.z);
}

vec2 TransformPlane(vec2 uv, vec3 center, float XRot, float YRot, float ZRot) {
    // First Rotate around Y axis
    vec2 RayDirection =  vec2(uv.x, 0.0);
    vec2 A1 = vec2(0.0, -1.0);
    vec2 B1 = RayDirection - A1;
    vec2 C1 = rotate(vec2(-1.0, 0.0), vec2(center.x, 0.0), YRot);
    vec2 D1 = rotate(vec2(1.0, 0.0), vec2(center.x, 0.0), YRot) - C1;

    // calculate intersection point
    float u = ( (C1.y + 1.0) * D1.x - C1.x * D1.y ) / (D1.x*B1.y-D1.y*B1.x);

    // position on the XY plane after Y-axis rotation
    float sx = u * B1.x;
    float sy = u * uv.y;

    // Now Rotate around X axis
    RayDirection = vec2(sy, 0.0);
    vec2 B2 = RayDirection - A1;
    vec2 C2 = rotate(vec2(-1.0, 0.0), vec2(center.y, 0.0), XRot);
    vec2 D2 = rotate(vec2(1.0, 0.0), vec2(center.y, 0.0), XRot) - C2;

    // calculate intersection point
    float v = ( (C2.y + 1.0) * D2.x - C2.x * D2.y ) / (D2.x*B2.y-D2.y*B2.x);

    // the position after x and y rotations
    vec3 pos = vec3(v * sx, v * B2.x, 0.0 );
   
    // Now rotate the position around Z axis
    vec3 finalPos = rotateZ(pos, center, ZRot);

    // final position on the 3D plane after Z-axis rotation
    return finalPos.xy;
}

void main()
{
    vec2 uv = -1.0 + 2.0 * gl_FragCoord.xy / u_resolution.xy;
    float R_X = 0.;
    float R_Y =  u_time;
    float R_Z = 0.; // Adjust the value for Z-axis rotation
    vec3 MyCoords = vec3(TransformPlane(uv, RotationCenter, R_X, R_Y, R_Z), 0.0);
    vec2 MyTexCoord = (MyCoords.xy + vec2(1.0)) / 2.0;

    //vec4 image1 = texture2D(texture, MyTexCoord);
    //vec4 image2 = texture(iChannel1, MyTexCoord);
    //fragColor = mix(image1, image2, (sin(iTime * 0.5) + 1.0) / 2.0);
     gl_FragColor = texture2D(texture, MyTexCoord);
}

The shader looks fine and seems to work on a sprite but i don't know if i can use it to spin a text.
I tried to use a rendertexture and make a sprite out of it but with this i have a black background on my text

sf::RenderTexture rendertexture;
rendertexture.create(SCREEN_WIDTH,SCREEN_HEIGHT);
rendertexture.clear();
rendertexture.draw(myText);
sf::Sprite sprite(rendertexture.getTexture());
//window.draw(myText,&testRotation); This doesnt work
window.draw(sprite,&testRotation);

This doesnt work, i dont know if i need to use deeper things as vertex and stuff like that.
Thanks for reading this and let me know if you need sample of code or smthing else