D:/Timo/Visualisierung/LU/Aufgabe1/src/GLTexture1D.cpp

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#include "GLTexture1D.h"

#include <QDebug>

GLTexture1D::GLTexture1D()
{
        texture = 0;
        width = 0;
}

GLTexture1D::~GLTexture1D()
{
        free();
}

GLuint GLTexture1D::getTexture()
{
        return texture;
}

GLuint GLTexture1D::getWidth()
{
        return width;
}

void GLTexture1D::setTypes(GLuint textureColorType, GLuint filterType)
{
        this->textureColorType = textureColorType;
        this->filterType = filterType;
}

void GLTexture1D::create(GLuint width)
{
        free();

        GLenum glError;

        // save current state
        GLint cs1DTexture;
        glGetIntegerv(GL_TEXTURE_BINDING_1D, &cs1DTexture);

        glGenTextures(1, &texture);
        glBindTexture(GL_TEXTURE_1D, texture);

        glTexImage1D(GL_TEXTURE_1D, 0, textureColorType, width, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
        glError = glGetError();
        while(glError != GL_NO_ERROR && width > 512) {
                qDebug() << "create GLTexture1D with " << width << " width failed";
                width /= 2;
                glTexImage1D(GL_TEXTURE_1D, 0, textureColorType, width, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
                glError = glGetError();
        }

        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MIN_FILTER, filterType);
        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_MAG_FILTER, filterType);

        glTexParameteri(GL_TEXTURE_1D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);

        glError = glGetError();
        if(glError != GL_NO_ERROR)
        {
                qDebug() << "create GLTexture1D error / generate texture: " << (char*)gluErrorString(glError);
        }

        // revert
        glBindTexture(GL_TEXTURE_1D, cs1DTexture);

        glError = glGetError();
        if(glError != GL_NO_ERROR)
        {
                qDebug() << "create GLTexture1D error / unbind: " << (char*)gluErrorString(glError);
        }

        this->width = width;
}

bool GLTexture1D::updateSubImage(GLuint xOffset, GLuint width, GLuint format, GLuint type, void* data)
{
        bool ret = false;

        if(texture != 0)
        {
                // save current state
                GLint cs1DTexture;
                glGetIntegerv(GL_TEXTURE_BINDING_1D, &cs1DTexture);

                glBindTexture(GL_TEXTURE_1D, texture);
                glTexSubImage1D(GL_TEXTURE_1D, 0, xOffset, width, format, type, data);

                // revert
                glBindTexture(GL_TEXTURE_1D, cs1DTexture);

                GLenum glError = glGetError();
                if(glError != GL_NO_ERROR)
                {
                        qDebug() << "updateSubImage GLTexture1D error: " << (char*)gluErrorString(glError);
                }

                ret = true;
        }

        return ret;
}

void GLTexture1D::free()
{
        if(texture != 0)
        {
                glDeleteTextures(1, &texture);
                texture = 0;

                GLenum glError = glGetError();
                if(glError != GL_NO_ERROR)
                {
                        qDebug() << "free GLTexture1D error: " << (char*)gluErrorString(glError);
                }
        }
}

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