JESSICA BARON

void loadTexture(char *filename, unsigned int texID)
{
    FILE *fopen(), *fptr;
    char buf[512];
    int imgSize, imgWidth, imgHeight, maxColor, face;
    unsigned char *texBytes, *parse;

    fptr=fopen(filename,"r");
    fgets(buf,512,fptr);     //Strip first line.

    do            //Strip off comments.
    { fgets(buf,512,fptr); }
    while(buf[0]=='#');

    parse = strtok(buf," \t");
    imgWidth = atoi(parse);
    parse = strtok(NULL," \n");
    imgHeight = atoi(parse);

    fgets(buf,512,fptr);
    parse = strtok(buf," \n");
    maxColor = atoi(parse);

    imgSize = imgWidth*imgHeight;
    texBytes = (unsigned char *)calloc(3,imgSize);
    fread(texBytes,3,imgSize,fptr);
    fclose(fptr);

    //Cube map to surround the object. Texture coords come from intersecting obj normals with a cube face.
    glBindTexture(GL_TEXTURE_CUBE_MAP, texID);
    for(face=0; face<6; face++)
    {    //Each face of the cube map is a separate 2D image, indexing starting with the positive X face.
        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + face,
            0, GL_RGB, imgWidth, imgHeight, 0, GL_RGB,
            GL_UNSIGNED_BYTE, texBytes);
    }

    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);     //Texture magnification with small (>=1) area of texture element.
      glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR);

    free(texBytes);
}

​

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<Vertex Shader>

​

varying vec3 eyeCoord_vNormal, eyeCoord_vPos;            //Interpolated normals and positions between vertices
out vec3 texCoords;                        //Generate texture coordinates here to pass to the frag shader.

void main()
{
    eyeCoord_vNormal = gl_NormalMatrix * gl_Normal;                //gl_NormalMatrix OpenGL takes from the ModelView mat.
    eyeCoord_vPos = gl_ModelViewMatrix * gl_Vertex;
    texCoords = reflect(-eyeCoord_vPos, normalize(eyeCoord_vNormal));    //GLSL built-in function reflect calculates reflection vector using the eye direction (- vertex pos) and surface normal.
    gl_Position = gl_ProjectionMatrix*gl_ModelViewMatrix*gl_Vertex;        //gl_Position is necessary output of the vert shader.
}