[resolved]Mixing Textures in Shader

[JoseMan]

Hi there,

I'm new here and maybe the problem that I discribe is allready resolved in another thread...

Okay, my problem:
I want to use 3 Textures in my shader and these textures I want to mix them but I don't know what I have to do to get this working.

Here is my code so far (c++):

void AClass::init(unsigned int wndWidth, unsigned int wndHeight)
{

        if (!mOffScreenTarget.create(wndWidth, wndHeight))
                return;
        mOffScreenTarget.setSmooth(true);

        mSchriftTex.loadFromFile("IntroGrafiken\\Logo.png");
        mSchriftSprite.setTexture(mSchriftTex);
        mRauschenSoftTex.loadFromFile("IntroGrafiken\\Rauschen.png");
        mRauschenSoftSprite.setTexture(mRauschenSoftTex);
        mRauschenHardTex.loadFromFile("IntroGrafiken\\20_rauschen.gif");
        mRauschenHardSprite.setTexture(mRauschenHardTex);

        mShader.loadFromFile("IntroShader\\IntroShader.vert","IntroShader\\IntroShader.frag");
       
        mShader.setParameter("schriftZugTextureSampler", mSchriftTex);
        mShader.setParameter("rauschSoftTextureSampler", mRauschenSoftTex);
        mShader.setParameter("rauscheHardTextureSampler", mRauschenHardTex);
}
 

and my draw-function:

        sf::RenderStates state = sf::RenderStates::Default;
        state.shader = &mShader;
        mOffScreenTarget.clear(sf::Color::White);
        mOffScreenTarget.draw(mSchriftSprite, state);
        mOffScreenTarget.draw(mRauschenHardSprite, state);
        mOffScreenTarget.draw(mRauschenSoftSprite, state);
        mOffScreenTarget.display();

        window.draw(sf::Sprite(mOffScreenTarget.getTexture()));

 

But this don't work. With this code all Sprites get drawn simple. But I want to mix them.
The shader code works I think...but I don't know what I have to do to get what I want!!!

Okay, I hope so you understand what I want and I hope my english isn't soo bad^^

Maybe you can post here some code...cause that says often more to me

Best regards
JoseMan

[Laurent]

You'll have to explain in detail what "mix them" means, there are many ways to mix multiple sprites

You can also show us your shaders, that could help to understand what you're trying to achieve.

[JoseMan]

okay.
Here is my Vertex-Shader:

#version 330 core

void main()
{
    vec4 vertex = gl_ModelViewMatrix * gl_Vertex;
       
    gl_Position = gl_ProjectionMatrix * vertex;
    gl_TexCoord[0] = gl_TextureMatrix[0] * gl_MultiTexCoord0;
    gl_FrontColor = gl_Color;

}
 

And the fragment-shader:

#version 330 core

vec2 uvSchriftZugTexture;
vec2 uvRauschTexture;

// Ouput data
vec4 color;

uniform sampler2D schriftZugTextureSampler;
uniform sampler2D rauschSoftTextureSampler;
uniform sampler2D rauscheHardTextureSampler;

uniform float alpha;
vec4 colSchriftZugTexture;
vec4 colRauschSoft;
vec4 colRauschHard;

void main()
{
        uvSchriftZugTexture = gl_TexCoord[0];
        uvRauschTexture = gl_TexCoord[0];
        colSchriftZugTexture = texture2D( schriftZugTextureSampler, uvSchriftZugTexture).rgba;
        colRauschSoft = texture2D( rauschSoftTextureSampler, uvRauschTexture).rgba;
        colRauschHard = texture2D( rauscheHardTextureSampler, uvRauschTexture).rgba;
       
        color = mix(colSchriftZugTexture,colRauschSoft,0.55);
        color = mix(color,colRauschHard,0.30);
       
        gl_FragColor = color;
}
 

All I want to do is use the simple glsl-"mix"-function with 3 textures...but I don't know how to handle that with sfml.

[JoseMan]

Okay, the problem is resolved.
Now I'm happy

The shader code was not right.
Now it works.

And I don't need to draw the sprites...

Thanks...

[eXpl0it3r]

What's the solution?