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Quellcode

this.bind_anyway();

/*
glBegin(GL_QUADS);
    // top left
    glTexCoord2f(0.25, 0.25);
    glVertex2f(0, 0);
    // top right
    glTexCoord2f(0.8, 0.25);
    glVertex2f(w, 0);
    // bottom right
    glTexCoord2f(0.8, 0.8);
    glVertex2f(w, h);
    // bottom left
    glTexCoord2f(0.25, 0.8);
    glVertex2f(0, h);
glEnd();
*/
glBegin(GL_QUADS);
    // top left
    glTexCoord2f(0.25, 0.25);
    glVertex2f(0, 0);
    // top right
    glTexCoord2f(0.8, 0.25);
    glVertex2f(400, 0);
    // bottom right
    glTexCoord2f(0.8, 0.8);
    glVertex2f(400, 400);
    // bottom left
    glTexCoord2f(0.25, 0.8);
    glVertex2f(0, 400);
glEnd();

C#-Quelltext

Texture subimage() {
    assert(this._pixels !is null);
    
    const ushort w = 52;
    const ushort h = 52;
    const ushort fromx = 31;
    const ushort fromy = 38;
    
    GLuint Screen;
    glGenTextures(1, &Screen);
    //writefln("gen. Id for Sub.: %d", Screen);
    
    glBindTexture(GL_TEXTURE_2D, Screen);
    
    // Daten in den Speicher, Lineares Filtering aktivieren
    glTexImage2D(GL_TEXTURE_2D, 0, 4, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, null);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
    
    //GC.free(memory);
    
    glClearColor(0.0, 0.0, 0.0,0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    
    glBindTexture(GL_TEXTURE_2D, Screen);
    
    this.bind_anyway();
    
    const ushort vp_w = Texture._window_width;
    const ushort vp_h = Texture._window_height;
    
    const float percent_x = cast(float)(vp_w) / this._width;
    const float percent_y = cast(float)(vp_h) / this._height;
    
    //glViewport(0, 0, vp_w, vp_h);
    
    glBegin(GL_QUADS);
        // top left
        glTexCoord2f(0, 0);
        glVertex2f(0, 0);
        // top right
        glTexCoord2f(1, 0);
        glVertex2f(vp_w, 0);
        // bottom right
        glTexCoord2f(1, 1);
        glVertex2f(vp_w, vp_h);
        // bottom left
        glTexCoord2f(0, 1);
        glVertex2f(0, vp_h);
    glEnd();
    
    //glViewport(0, 0, 400, 400);
    
    glBindTexture(GL_TEXTURE_2D, Screen);
    glCopyTexImage2D(GL_TEXTURE_2D, 0, this._format, cast(uint)(fromx * percent_x), cast(uint)(fromy * percent_y), w, h, 0);

    // Löschen des Color-Buffers. Deaktiviert sieht man eine weitere Textur unten.
    glClearColor(1.0, 1.0, 1.0, 0.0);
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
    
    // Zeichnen der Kopie
    glBindTexture(GL_TEXTURE_2D, Screen);
    
    const ubyte d = 5;
    
    glBegin(GL_QUADS);
        // top left
        glTexCoord2i(0, 0);
        glVertex2f(d, d);
        // top right
        glTexCoord2i(1, 0);
        glVertex2f(w + d, d);
        // bottom right
        glTexCoord2i(1, 1);
        glVertex2f(w + d, h + d);
        // bottom left
        glTexCoord2i(0, 1);
        glVertex2f(d, h + d);
    glEnd();
    
    glDeleteTextures(1, &Screen);
    
    //return new Texture(Rect(fromx, fromy, w, h), Screen, this);
    return null;
}