Drawing some Elements

OpenGL OpenGL: Basic Coding
1

Hello everybody, I try to draw a little figure where my mouse cursor is, here are some information:

GLfloat Renderer::mouseVertices[] = {
    0.0f, 0.0f, 0.0f,
    0.0f, 0.5f, 0.0f,
    0.5f, 0.0f, 0.0f,
    0.0f, -0.5f, 0.0f,
    -0.5f, 0.0f, 0.0f
};

GLuint Renderer::mouseIndices[] = {
    0, 1, 2,
    0, 2, 3,
    0, 3, 4,
    0, 4, 1
};

   glGenVertexArrays(1, &mouse.VAO);

    glGenBuffers(1, &mouse.VBO);
    glGenBuffers(1, &mouse.EBO);

    glBindVertexArray(mouse.VAO);

    glBindBuffer(GL_ARRAY_BUFFER, mouse.VBO);
    glBufferData(GL_ARRAY_BUFFER, sizeof(mouseVertices), mouseVertices, GL_STATIC_DRAW);

    glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mouse.EBO);
    glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(mouseIndices), mouseIndices, GL_STATIC_DRAW);

    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(GLfloat), (GLvoid*)0);
    glEnableVertexAttribArray(0);

    glBindBuffer(GL_ARRAY_BUFFER, 0);

    glBindVertexArray(0);

the actual rendering:

   glfwGetCursorPos(window, &mousePosX, &mousePosY);
    glUseProgram(shaderProgramMouse);

    std::cout << mousePosX << "|" << mousePosY << std::endl;
    glm::mat4 projection;
    glm::mat4 model;

    projection = glm::ortho(0.0f, (float) Game::WIDTH, 0.0f, (float) Game::HEIGHT);
    //(float) mousePosX, (float) mousePosY,

    model = glm::translate(model, glm::vec3((float) mousePosX, (float) mousePosY, 1.0f));
    glUniformMatrix4fv(glGetUniformLocation(shaderProgramMouse, "projection"), 1, GL_FALSE, glm::value_ptr(projection));
    glUniformMatrix4fv(glGetUniformLocation(shaderProgramMouse, "model"), 1, GL_FALSE, glm::value_ptr(model));

    glBindVertexArray(mouse.VAO);
    glDrawElements(GL_TRIANGLES, 12, GL_UNSIGNED_INT, 0);
    glBindVertexArray(0);

    glUseProgram(0);

All other things were correctly rendered… am I overseeing something?

2

Your vertices are set to be rendered clockwise instead of counter-clockwise (default mode). I’m not sure this is the issue, but that is the only thing I can see in your code.