D:/Timo/Visualisierung/LU/Aufgabe1/src/GLTexture.cpp

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#include "GLTexture.h"

#include <QDebug>

GLTexture::GLTexture()
{
        texture = 0;
}

GLTexture::~GLTexture()
{
        free();
}

GLuint GLTexture::getTexture()
{
        return texture;
}

void GLTexture::setTypes(GLuint textureColorType, GLuint filterType)
{
        this->textureColorType = textureColorType;
        this->filterType = filterType;
}

void GLTexture::create(GLuint width, GLuint height)
{
        free();

        GLenum glError;

        // save current state
        GLint cs2DTexture;
        glGetIntegerv(GL_TEXTURE_BINDING_2D, &cs2DTexture);

        glGenTextures(1, &texture);
        glBindTexture(GL_TEXTURE_2D, texture);
        if(textureColorType != GL_DEPTH_COMPONENT32)
        {
                glTexImage2D(GL_TEXTURE_2D, 0, textureColorType, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
        }
        else
        {
                glTexImage2D(GL_TEXTURE_2D, 0, textureColorType, width, height, 0, GL_DEPTH_COMPONENT, GL_UNSIGNED_BYTE, 0);
        }
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, filterType);
        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, filterType);

        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
        glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);

        glError = glGetError();
        if(glError != GL_NO_ERROR)
        {
                qDebug() << "create GLTexture error / generate texture: " << (char*)gluErrorString(glError);
        }

        // revert
        glBindTexture(GL_TEXTURE_2D, cs2DTexture);

        glError = glGetError();
        if(glError != GL_NO_ERROR)
        {
                qDebug() << "create GLTexture error / unbind: " << (char*)gluErrorString(glError);
        }
}

void GLTexture::free()
{
        if(texture != 0)
        {
                glDeleteTextures(1, &texture);
                texture = 0;

                GLenum glError = glGetError();
                if(glError != GL_NO_ERROR)
                {
                        qDebug() << "free GLTexture error: " << (char*)gluErrorString(glError);
                }
        }
}

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