celshading/resourceloader.cpp at master · adamabeshouse/celshading · GitHub

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#include "resourceloader.h"

#include <QGLShaderProgram>
#include <QList>
#include <QString>
#include "glm.h"


/**
  Loads the cube map into video memory.

  @param files: a list of files containing the cube map images (should be length
  six) in order
  @return the assigned OpenGL id to the cube map
**/
GLuint ResourceLoader::loadCubeMap(QList<QFile *> files)
{
    Q_ASSERT(files.length() == 6);

    // Generate an ID
    GLuint id;
    glGenTextures(1, &id);

    // Bind the texture
    glBindTexture(GL_TEXTURE_CUBE_MAP, id);

    // Load and build mipmaps for each image
    for (int i = 0; i < 6; ++i)
    {
        QImage image, texture;
        image.load(files[i]->fileName());
        image = image.mirrored(false, true);
        texture = QGLWidget::convertToGLFormat(image);
        texture = texture.scaledToWidth(1024, Qt::SmoothTransformation);
        glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 3, 3, texture.width(), texture.height(), 0, GL_RGBA,GL_UNSIGNED_BYTE, texture.bits());
        gluBuild2DMipmaps(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 3, texture.width(), texture.height(), GL_RGBA, GL_UNSIGNED_BYTE, texture.bits());
    }

    // Set filter when pixel occupies more than one texture element
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
    // Set filter when pixel smaller than one texture element
    glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);

    // Unbind the texture
    glBindTexture(GL_TEXTURE_CUBE_MAP, 0);

    return id;
}

/**
    Loads an OBJ models from a file
  **/
Model ResourceLoader::loadObjModel(QString filePath)
{
    Model m;
    m.model = glmReadOBJ(filePath.toStdString().c_str());
    glmUnitize(m.model);
    m.idx = glmList(m.model, GLM_SMOOTH);
    return m;
}


/**
    Creates a call list for a skybox
  **/
GLuint ResourceLoader::loadSkybox()
{
    GLuint id = glGenLists(1);
    glNewList(id, GL_COMPILE);

    // Be glad we wrote this for you...ugh.
    glBegin(GL_QUADS);
	float extent = 10000.f;
	glTexCoord3f( 1.0f,  1.0f, -1.0f); glVertex3f( extent,  extent, -extent);
	glTexCoord3f(-1.0f,  1.0f, -1.0f); glVertex3f(-extent,  extent, -extent);
	glTexCoord3f(-1.0f, -1.0f, -1.0f); glVertex3f(-extent, -extent, -extent);
	glTexCoord3f( 1.0f, -1.0f, -1.0f); glVertex3f( extent, -extent, -extent);

	glTexCoord3f( 1.0f,  1.0f,  1.0f); glVertex3f( extent,  extent,  extent);
	glTexCoord3f( 1.0f,  1.0f, -1.0f); glVertex3f( extent,  extent, -extent);
	glTexCoord3f( 1.0f, -1.0f, -1.0f); glVertex3f( extent, -extent, -extent);
	glTexCoord3f( 1.0f, -1.0f,  1.0f); glVertex3f( extent, -extent,  extent);

	glTexCoord3f(-1.0f,  1.0f,  1.0f); glVertex3f(-extent,  extent,  extent);
	glTexCoord3f( 1.0f,  1.0f,  1.0f); glVertex3f( extent,  extent,  extent);
	glTexCoord3f( 1.0f, -1.0f,  1.0f); glVertex3f( extent, -extent,  extent);
	glTexCoord3f(-1.0f, -1.0f,  1.0f); glVertex3f(-extent, -extent,  extent);

	glTexCoord3f(-1.0f,  1.0f, -1.0f); glVertex3f(-extent,  extent, -extent);
	glTexCoord3f(-1.0f,  1.0f,  1.0f); glVertex3f(-extent,  extent,  extent);
	glTexCoord3f(-1.0f, -1.0f,  1.0f); glVertex3f(-extent, -extent,  extent);
	glTexCoord3f(-1.0f, -1.0f, -1.0f); glVertex3f(-extent, -extent, -extent);

	glTexCoord3f( 1.0f,  1.0f, -1.0f); glVertex3f( extent,  extent, -extent);
	glTexCoord3f( 1.0f,  1.0f,  1.0f); glVertex3f( extent,  extent,  extent);
	glTexCoord3f(-1.0f,  1.0f,  1.0f); glVertex3f(-extent,  extent,  extent);
	glTexCoord3f(-1.0f,  1.0f, -1.0f); glVertex3f(-extent,  extent, -extent);

	glTexCoord3f( 1.0f, -1.0f, -1.0f); glVertex3f( extent, -1, -extent);
	glTexCoord3f( 1.0f, -1.0f,  1.0f); glVertex3f( extent, -1,  extent);
	glTexCoord3f(-1.0f, -1.0f,  1.0f); glVertex3f(-extent, -1,  extent);
	glTexCoord3f(-1.0f, -1.0f, -1.0f); glVertex3f(-extent, -1, -extent);

    glEnd();
    glEndList();

    return id;
}

/**
    Creates a new shader program from a vert shader only
  **/
QGLShaderProgram * ResourceLoader::newVertShaderProgram(const QGLContext *context, QString vertShader)
{
    QGLShaderProgram *program = new QGLShaderProgram(context);
    program->addShaderFromSourceFile(QGLShader::Vertex, vertShader);
    program->link();
    return program;
}

/**
    Creates a new shader program from a frag shader only
  **/
QGLShaderProgram * ResourceLoader::newFragShaderProgram(const QGLContext *context, QString fragShader)
{
    QGLShaderProgram *program = new QGLShaderProgram(context);
    program->addShaderFromSourceFile(QGLShader::Fragment, fragShader);
    program->link();
    return program;
}

/**
    Creates a shader program from both vert and frag shaders
  **/
QGLShaderProgram * ResourceLoader::newShaderProgram(const QGLContext *context, QString vertShader, QString fragShader)
{
    QGLShaderProgram *program = new QGLShaderProgram(context);
    program->addShaderFromSourceFile(QGLShader::Vertex, vertShader);
    program->addShaderFromSourceFile(QGLShader::Fragment, fragShader);
    program->link();
    return program;
}