Unsolved Can someone Interpret texture methods and/or uniforms into QT OpenGL

[AI_Messiah]

The problem I have with textures is this:

string filename = string( path );
    filename = directory + '/' + filename;
    GLuint textureID;
    glGenTextures( 1, &textureID );
    
    int width, height;
    
    unsigned char *image = SOIL_load_image( filename.c_str( ), &width, &height, 0, SOIL_LOAD_RGB );
    
    // Assign texture to ID
    glBindTexture( GL_TEXTURE_2D, textureID );
    glTexImage2D( GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, image );
    glGenerateMipmap( GL_TEXTURE_2D );
    
    // Parameters
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR );
    glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
    glBindTexture( GL_TEXTURE_2D, 0 );
    SOIL_free_image_data( image );
    
    return textureID;

the problem I have with uniforms is that with OpenGL you can pass a name. How would I do this with QT

glUniform1i( glGetUniformLocation( program, ( name + number ).c_str( ) ), i );

//and

glUniform1f( glGetUniformLocation( shader.Program, "material.shininess" ), 16.0f );

if there is no equivalent method is there some kind of work around?

[8Observer8]

@AI_Messiah said in Can someone Interpret texture methods and/or uniforms into QT OpenGL:

if there is no equivalent method is there some kind of work around?

Why do you use SOIL with Qt? Qt can load textures by itself:

#include <QtGui/QOpenGLTexture>
/* ... */

        m_texture.create();
        m_texture.setData(QImage(":/Textures/WornBrownBrickwork_256.png"));
        m_texture.setMinMagFilters(QOpenGLTexture::Linear, QOpenGLTexture::Linear);
        m_texture.setWrapMode(QOpenGLTexture::ClampToEdge);

Example:

// Add this line to .pro:
// win32: LIBS += -lopengl32

#ifdef _WIN32
#include <windows.h>
extern "C" __declspec(dllexport) DWORD NvOptimusEnablement = 0x00000001;
extern "C" __declspec(dllexport) DWORD AmdPowerXpressRequestHighPerformance = 0x00000001;
#endif

#include <QtWidgets/QApplication>
#include <QtWidgets/QOpenGLWidget>
#include <QtGui/QOpenGLShaderProgram>
#include <QtGui/QOpenGLBuffer>
#include <QtGui/QOpenGLTexture>
#include <QtGui/QMatrix4x4>

class Widget : public QOpenGLWidget {
    Q_OBJECT
public:
    Widget() : m_texture(QOpenGLTexture::Target2D) {
        setWindowTitle("OpenGL 3.3. Qt C++");
        resize(400, 400);
    }
private:
    QOpenGLShaderProgram m_program;
    QOpenGLBuffer m_vertPosBuffer;
    QOpenGLBuffer m_texCoordBuffer;
    QOpenGLTexture m_texture;
    QMatrix4x4 m_mvpMatrix;
    QMatrix4x4 m_projMatrix;
    QMatrix4x4 m_viewMatrix;
    QMatrix4x4 m_modelMatrix;
    int m_uMvpMatrixLocation;
    const float WORLD_HEIGHT = 50;

    void initializeGL() override {
        glClearColor(0.5f, 0.5f, 0.5f, 1.0f);
        const char *vertShaderSrc =
                "#version 330 core\n"
                "in vec3 aPosition;"
                "in vec2 aTexCoord;"
                "uniform mat4 uMvpMatrix;"
                "out vec2 vTexCoord;"
                "void main()"
                "{"
                "    gl_Position = uMvpMatrix * vec4(aPosition, 1.0);"
                "    vTexCoord = aTexCoord;"
                "}";
        const char *fragShaderSrc =
                "#version 330 core\n"
                "uniform sampler2D uSampler;"
                "in vec2 vTexCoord;"
                "out vec4 fragColor;"
                "void main()"
                "{"
                "    fragColor = texture2D(uSampler, vTexCoord);"
                "}";
        m_program.addShaderFromSourceCode(QOpenGLShader::Vertex, vertShaderSrc);
        m_program.addShaderFromSourceCode(QOpenGLShader::Fragment, fragShaderSrc);
        m_program.link();
        m_program.bind();
        float vertPositions[] = {
            -0.5f, -0.5f, 0.f,
            0.5f, -0.5f, 0.f,
            -0.5f, 0.5f, 0.f,
            0.5f, 0.5f, 0.f
        };
        float texCoords[] = {
            0.f, 1.f,
            1.f, 1.f,
            0.f, 0.f,
            1.f, 0.f
        };
        initVertexBuffer(m_vertPosBuffer, vertPositions, sizeof(vertPositions), "aPosition", 0, 3);
        initVertexBuffer(m_texCoordBuffer, texCoords, sizeof(texCoords), "aTexCoord", 1, 2);
        m_texture.create();
        m_texture.setData(QImage(":/Textures/WornBrownBrickwork_256.png"));
        m_texture.setMinMagFilters(QOpenGLTexture::Linear, QOpenGLTexture::Linear);
        m_texture.setWrapMode(QOpenGLTexture::ClampToEdge);
        m_program.bind();
        m_uMvpMatrixLocation = m_program.uniformLocation("uMvpMatrix");
        m_modelMatrix.scale(QVector3D(50.f, 50.f, 1.f));
        m_viewMatrix.lookAt(QVector3D(0.f, 0.f, 40.f),
                            QVector3D(0.f, 0.f, 0.f),
                            QVector3D(0.f, 1.f, 0.f));
    }
    void paintGL() override {
        glClear(GL_COLOR_BUFFER_BIT);
        m_mvpMatrix = m_projMatrix * m_viewMatrix * m_modelMatrix;
        m_program.bind();
        m_program.setUniformValue(m_uMvpMatrixLocation, m_mvpMatrix);
        m_texture.bind();
        glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
    }
    void resizeGL(int w, int h) override {
        glViewport(0, 0, w, h);
        float aspect = (float) w / h;
        float worldWidth = aspect * WORLD_HEIGHT;
        m_projMatrix.setToIdentity();
        m_projMatrix.ortho(-worldWidth / 2.f, worldWidth / 2.f,
                           -WORLD_HEIGHT / 2.f, WORLD_HEIGHT / 2.f, 50.f, -50.f);
    }
    void initVertexBuffer(QOpenGLBuffer &buffer, float data[], int amount,
                          const char *locationName, int locationIndex, int tupleSize) {
        buffer.create();
        buffer.bind();
        buffer.allocate(data, amount);
        m_program.bindAttributeLocation(locationName, locationIndex);
        m_program.setAttributeBuffer(locationIndex, GL_FLOAT, 0, tupleSize);
        m_program.enableAttributeArray(locationIndex);
    }
};

#include "main.moc"

int main(int argc, char *argv[]) {
    QApplication a(argc, argv);
    Widget w;
    w.show();
    return a.exec();
}