sf::Shader + sf::RenderTexture = Malfunction

[krikri]

Hello!
I'm trying to draw the resulting texture after applying a shader, into a new texture.
But the problem is that after doing this:

shaderTexture.create(1280,720);
 

the area where he painted the resulting texture now is just white.

My code is :

// Inclusion de OpenGL
#include <SFML/OpenGL.hpp>

#include <SFML/Graphics.hpp>

#define NORMAL_OTHER "shader/otro_normal.png"
#define TEXTURE_OTHER "shader/otro_texture.png"

int main() {
        sf::RenderWindow window(sf::VideoMode(1280, 720), "window!!!");
        sf::Shader miShader;
        miShader.loadFromFile("shader/bumpmap.frag",sf::Shader::Fragment);

        sf::RenderTexture shaderTexture;
        if(!shaderTexture.create(1280,720))
                return -1;

        glShadeModel (GL_SMOOTH);
       
        GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
        GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
        GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
        GLfloat mat_shininess[] = { 100.0 };
        GLfloat light_position[] = { 200.0, 200.0, 800.0, 0.0 };

        glLightfv(GL_LIGHT0, GL_POSITION, light_position);
        glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
        glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
        glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
        glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);

        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);

        // Normal Map
        sf::Texture texturaOtra;
        if (!texturaOtra.loadFromFile(NORMAL_OTHER)) {
                return EXIT_FAILURE;
        }
        // Load a sprite to display
        sf::Texture otra;
        if (!otra.loadFromFile(TEXTURE_OTHER)) {
                return EXIT_FAILURE;
        }
        sf::Sprite spriteOtra(otra);
       
        spriteOtra.setPosition(150,150);
        sf::Vector2f p;
        p = spriteOtra.getPosition();
        sf::Vector3f p2 = sf::Vector3f(p.x,p.y,0.0);
        miShader.setParameter("position",p2);
        miShader.setParameter("normalTexture", texturaOtra);
        miShader.setParameter("texture", sf::Shader::CurrentTexture);

    // Start the game loop
        bool done = false;

        while (!done) {                
                // Process events
                sf::Event Event;
                while (window.pollEvent(Event)) {
            // Close window : exit
                        if (Event.type == sf::Event::Closed) {
                                done = true;
                        }
        }

        // Clear screen
                window.clear();
               
                shaderTexture.clear();         
                shaderTexture.draw(spriteOtra,&miShader);
                shaderTexture.display();
                window.draw(sf::Sprite(shaderTexture.getTexture()));
               
                window.display();

                }
        window.close();
    return EXIT_SUCCESS;
}
 

My system specifications are:
OS: Windows 7 Professional 64bits
Video Card: AMD Radeon HD 6670
IDE: Visual Studio 2008 Professional.
SFML version: 2.0 (downloaded from the official site in early March).

Sorry for my terrible English....

[Laurent]

There are a few things that you can do to narrow down the problem: try without your custom GL lighting calls, with a simple shader that just outputs the source color, etc.

[krikri]

The problem is simple, I can not apply the bump map. I tried shaders only change the color and working but not with the following fragment shader.
And the problem with the OpenGL light is solved by putting the following lines

sf::RenderTexture shaderTexture;
        if(!shaderTexture.create(1280,720))
                return -1;
 

below the shader creation.

[Laurent]

If it's your shader which is broken, you should show it

[krikri]

the shader's code is:

// Textura y Bumpmap
uniform sampler2D normalTexture;
uniform sampler2D texture;
//variables internas
uniform vec3 position;

void main()
{
        // El color del pixel actual en el Normal Map
        vec4 normColor = texture2D(normalTexture, gl_TexCoord[0].st);
       
        // El color del pixel actual en la Textura
        vec4 texColor = texture2D(texture, gl_TexCoord[0].st );
       
        // El vector normal al Normal Map
        vec3 normalMapVector = 2.0 *(normColor.rgb - 0.5);
       
        // Calculamos el vector de la Luz
        vec3 light = normalize(gl_LightSource[0].position.xyz - position);
       
        // Calculamos el vector del Ojo
        vec3 E = normalize(-position); // we are in Eye Coordinates, so EyePos is (0,0,0)  
       
        // Calculamos el vector ??
        vec3 R = normalize(-reflect(light,normalMapVector));    
       
        // Calculamos el efecto de diffuse
    vec4 Idiff = gl_LightSource[0].diffuse * max(dot(normalMapVector,light), 0.0);  
    Idiff = clamp(Idiff, 0.0, 1.0);
   
    // Calculamos el efecto de ambient
    vec4 Iamb = gl_LightSource[0].ambient;
   
    // calculate Specular Term:
    vec4 Ispec = gl_LightSource[0].specular * pow(max(dot(R,E),0.0),0.3*gl_FrontMaterial.shininess);
    Ispec = clamp(Ispec, 0.0, 1.0);
   
    //
        gl_FragColor = Idiff*texColor + Iamb + Ispec;  
}
 

PD: I find another issue with renderTexture.

[krikri]

My code is now like this:

// Inclusion de OpenGL
#include <SFML/OpenGL.hpp>

#include <SFML/Graphics.hpp>

#define NORMAL_OTHER "shader/otro_normal.png"
#define TEXTURE_OTHER "shader/otro_texture.png"

int main() {

        sf::RenderWindow window(sf::VideoMode(1280, 720), "window!!!");

        sf::Shader miShader;
        miShader.loadFromFile("shader/bumpmap.frag",sf::Shader::Fragment);

        glShadeModel (GL_SMOOTH);
        glEnable(GL_LIGHTING);
        glEnable(GL_LIGHT0);
       
        GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
        GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
        GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
        GLfloat mat_shininess[] = { 100.0 };
        GLfloat light_position[] = { 200.0, 200.0, 800.0, 0.0 };

        glLightfv(GL_LIGHT0, GL_POSITION, light_position);
        glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
        glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
        glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
        glMaterialfv(GL_FRONT, GL_SHININESS, mat_shininess);

       
        // Normal Map
        sf::Texture texturaOtra; 8)
        if (!texturaOtra.loadFromFile(NORMAL_OTHER)) {
                return EXIT_FAILURE;
        }
        // Load a sprite to display
        sf::Texture otra;
        if (!otra.loadFromFile(TEXTURE_OTHER)) {
                return EXIT_FAILURE;
        }
        sf::Sprite spriteOtra(otra);
       
        spriteOtra.setPosition(150,150);
        sf::Vector2f p;
        p = spriteOtra.getPosition();
        sf::Vector3f p2 = sf::Vector3f(p.x,p.y,0.0);
        miShader.setParameter("position",p2);
        miShader.setParameter("normalTexture", texturaOtra);
        miShader.setParameter("texture", sf::Shader::CurrentTexture);

        sf::RenderTexture shaderTexture;
        if(!shaderTexture.create(1280,720))
                return -1;

    // Start the game loop
        bool done = false;

        while (!done) {                
                // Process events
                sf::Event Event;
                while (window.pollEvent(Event)) {
            // Close window : exit
                        if (Event.type == sf::Event::Closed) {
                                done = true;
                        }
        }

        // Clear screen
                window.clear();
               
                shaderTexture.clear();          
                shaderTexture.draw(spriteOtra);
                shaderTexture.display();

                window.draw(sf::Sprite(shaderTexture.getTexture()),&miShader);
               
                window.display();

                }
        window.close();
    return EXIT_SUCCESS;
}
 

With this code, the lights and the shader works, but another problem arises: Bad News

[Laurent]

With this code, the lights and the shader works, but another problem arises: Bad News

This is not a problem, have you read the comments in the issue?

[krikri]

This is not a problem, have you read the comments in the issue?

I read the comments and YES it is a problem for the shader that the image is upside down with a horizontally flip, modifying the normal way it works...


A patch solution to this abnormal behavior is to invest in the same sense the image of the bump map, which I think is inappropriate and impractical.

[Laurent]

I read the comments and YES it is a problem for the shader that the image is upside down with a horizontally flip, modifying the normal way it works...

Then it's a different issue than #116, which says that the texture is flipped when you forget to call display() -- which is not your case.

So what's your problem? What happens exactly?

[krikri]

Excuse me.. my case is if i don't call

    shaderTexture.display();
 

When I draw another sf:Sprite into the renderTexture, they  are drawing in sf::Window upside down.

If I make the call to the method, the issue with the Sprites.... disappears but  the relief generated by the shader is turned upside down and flip horizontal.

[Laurent]

I'm really sorry but you lost me.

Can we start again from zero, with clear, detailed explanations and code samples?

[krikri]

Of course