Unusually Slow Program

My OpenGL program is really slow and for months I have not been able to figure out why. Before, I was using the fixed function pipeline and it ran incredibly smooth. I am trying to load .obj models in the programmable pipeline now but it is incredibly slow.

My Code:


#include <GL/glew.h>
#include <GLFW/glfw3.h>
#include <stdio.h>
#include <glm/glm.hpp>
#define GLM_ENABLE_EXPERIMENTAL
#include <glm/ext.hpp>
#include "glm/gtx/string_cast.hpp"
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include <iostream>
#include <fstream>
#include <vector>

//Global variables

float yaw = -90.0f, pitch,lastX,lastY;
glm::vec3 cameraFront = glm::vec3(0.0f, 0.0f, -1.0f);

//External functions

void mouse_callback(GLFWwindow* window, double xpos, double ypos)
{
    for(static bool firstMouse = true;firstMouse;firstMouse=false)
    {
        lastX = xpos;
        lastY = ypos;
    }
    float xoffset = xpos - lastX, yoffset = lastY - ypos;
    lastX = xpos;
    lastY = ypos;

    xoffset,yoffset *= 0.255;//Sensitivity

    yaw   += xoffset;//Yaw is rotating the camera on the X axis
    pitch += yoffset;//Pitch is rotating the camera

    if(pitch > 89.0f)
        pitch = 89.0f;
    if(pitch < -89.0f)
        pitch = -89.0f;
    glm::vec3 front;
    front.x = cos(glm::radians(yaw)) * cos(glm::radians(pitch));
    front.y = sin(glm::radians(pitch));
    front.z = sin(glm::radians(yaw)) * cos(glm::radians(pitch));
    cameraFront = glm::normalize(front);
}

void loadObj(const char * path, std::vector < glm::vec3 > & out_vertices, std::vector < glm::vec2 > & out_uvs, std::vector < glm::vec3 > & out_normals,const int facetype){
    std::vector< unsigned int > vertexIndices, uvIndices, normalIndices;
    std::vector< glm::vec2 > temp_uvs;
    std::vector< glm::vec3 > temp_normals,temp_vertices;FILE * file = fopen(path, "r");
    if( file == NULL ){
        std::cout<<"ERROR::Could not load asset file, "<<path<<'
';
    }
    while( 1 ){
        char lineHeader[128];
        // read the first word of the line
        int res = fscanf(file, "%s", lineHeader);
        if (res == EOF)
            break; // EOF = End Of File. Quit the loop.
        if ( strcmp( lineHeader, "v" ) == 0 ){
            glm::vec3 vertex;
            fscanf(file, "%f %f %f
", &vertex.x,&vertex.y,&vertex.z);
            temp_vertices.push_back(vertex);
        }else if ( strcmp( lineHeader, "vt" ) == 0 ){
            glm::vec2 uv;
            fscanf(file, "%f %f
", &uv.x, &uv.y );
            temp_uvs.push_back(uv);
        }else if ( strcmp( lineHeader, "vn" ) == 0 ){
            glm::vec3 normal;
            fscanf(file, "%f %f %f
", &normal.x, &normal.y, &normal.z );
            temp_normals.push_back(normal);
        }else if ( strcmp( lineHeader,"f" ) == 0 ){
            std::string vertex1, vertex2, vertex3;
            unsigned int vertexIndex[3], uvIndex[3], normalIndex[3];
            if(facetype==0){
                if (fscanf(file, "%d/%d/%d %d/%d/%d %d/%d/%d
", &vertexIndex[0], &uvIndex[0], &normalIndex[0], &vertexIndex[1], &uvIndex[1], &normalIndex[1], &vertexIndex[2], &uvIndex[2], &normalIndex[2] ) != 9){
                    std::cout<<path<<" can't be read by our simple parser : ( Try exporting with other options
";
                }
            }else if(facetype==1){
                if (fscanf(file, "%d %d %d
", &vertexIndex[0], &vertexIndex[1], &vertexIndex[2]) != 3){
                    std::cout<<path<<" can't be read by our simple parser : ( Try exporting with other options
";
                }
            }else if(facetype==2){
                if (fscanf(file, "%d//%d %d//%d %d//%d
", &vertexIndex[0],&normalIndex[0], &vertexIndex[1],&normalIndex[1], &vertexIndex[2],&normalIndex[2]) != 6){
                    std::cout<<path<<" can't be read by our simple parser : ( Try exporting with other options
";
                }
            }
            vertexIndices.push_back(vertexIndex[0]);
            vertexIndices.push_back(vertexIndex[1]);
            vertexIndices.push_back(vertexIndex[2]);
            uvIndices    .push_back(uvIndex[0]);
            uvIndices    .push_back(uvIndex[1]);
            uvIndices    .push_back(uvIndex[2]);
            normalIndices.push_back(normalIndex[0]);
            normalIndices.push_back(normalIndex[1]);
            normalIndices.push_back(normalIndex[2]);
        }
        // For each vertex of each triangle
        for( unsigned int i=0; i<vertexIndices.size(); ++i ){
            unsigned int vertexIndex = vertexIndices[i];
            glm::vec3 vertex = temp_vertices[ vertexIndex-1 ];
            out_vertices.push_back(vertex);
        }
    }
}

void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
    glViewport(0, 0, width, height);
}  

int main() {

    //Firstly

    std::ios_base::sync_with_stdio(false);//Disables the synchronization between the C and C++ standard streams (though  mixing C- and C++ style I/O will be a challenge)
    std::cin.tie(NULL);//Unties cin from cout for faster cin and cout functions (this does mean that they are off sync but if you are not using cin than it doesnt matter)
    
    //Local variables

    glm::vec3 cameraPos = glm::vec3(0.0f, 0.0f, 3.0f);
    glm::mat4 view,project,model;
    float lastFrame,frames=-1,current_time,last_time,cameraSpeed;

    if(!glfwInit()) {
        //Initialization failed
        fprintf(stderr,"Failed to initialize GLFW
");//Initialization error
        return -1;//A -1 returned to the main function indicates a unsuccessful run
    }
    //Window hints change the way the window works (like settings)
    //glfwWindowHint(GLFW_SAMPLES,4);//4x antialiasing
    //glEnable(GL_MULTISAMPLE);
    //"Major" and "minor" are two components of a single version number, separated by a dot.
    glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR,3);//Version 3...
    glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR,3);//.3
    //glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT,GL_TRUE);//To make MacOS happy; should not be needed
    glfwWindowHint(GLFW_OPENGL_PROFILE,GLFW_OPENGL_CORE_PROFILE);//We don't want the old OpenGL
    const GLFWvidmode*mode=glfwGetVideoMode(glfwGetPrimaryMonitor());//Constant (not-changable) GLFWvideomode (variable type) is named "mode", is set to the primary monitor
    glfwWindowHint(GLFW_RED_BITS,mode->redBits);
    glfwWindowHint(GLFW_GREEN_BITS,mode->greenBits);
    glfwWindowHint(GLFW_BLUE_BITS,mode->blueBits);
    glfwWindowHint(GLFW_REFRESH_RATE,mode->refreshRate);
    glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
    float win_width=mode->width,win_height=mode->height;
    GLFWwindow*window=glfwCreateWindow(win_width,win_height,"My Title",glfwGetPrimaryMonitor(),NULL);//Create window that is the size of "mode" (constant primary monitor), named "", on the primary monitor
    if(window==NULL) { //If glfw window does not exist
        fprintf(stderr,"Failed to open GLFW window. If you have an Intel GPU, they are not 3.3 compatible.
");
        glfwTerminate();//End glfw processes
        return -1;
    }
    glfwMakeContextCurrent(window);//Initialize GLEW
    glewExperimental=true;//Needed in core profile
    if(glewInit()!=GLEW_OK) { //If glew is not okay
        fprintf(stderr,"Failed to initialize GLEW
");
        return -1;
    }
    glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
    glEnable(GL_DEPTH_TEST);
    glEnable(GL_CULL_FACE);//Enable face culling (culling means to not render)
    glCullFace(GL_BACK);//Prevent rendering triangles that are behind a shape (those that the player cannot see in the first place)
    glfwSetCursorPosCallback(window,mouse_callback);//When mouse enters window, run mouse_callback function. It also gives mouse position coordinates to that function
    glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_DISABLED);

    const char*vertexSource=R"glsl(
    #version 330 core
    layout (location = 0) in vec3 aPos;
    layout (location = 1) in vec3 aNormal;

    out vec3 FragPos;
    out vec3 Normal;

    uniform mat4 model;
    uniform mat4 view;
    uniform mat4 projection;

    void main()
    {
        FragPos = vec3(model * vec4(aPos, 1.0));
        Normal = mat3(transpose(inverse(model))) * aNormal;  
    
        gl_Position = projection * view * vec4(FragPos, 1.0);
    }
  )glsl";
    GLuint vertexShader=glCreateShader(GL_VERTEX_SHADER);//Creates shader object
    glShaderSource(vertexShader,1,&vertexSource,NULL);//Loads data to shader object
    glCompileShader(vertexShader);//Compiles shader object
    //Vertex compile error message
    int success;
    char infoLog[512];
    glGetShaderiv(vertexShader, GL_COMPILE_STATUS, &success);
    if(!success)
    {
        glGetShaderInfoLog(vertexShader, 512, NULL, infoLog);
        std::cout << "ERROR::SHADER::VERTEX::COMPILATION_FAILED
" << infoLog << '
';
    }
    const char* fragmentSource=R"glsl(
    #version 330 core
    out vec4 FragColor;

    in vec3 Normal;  
    in vec3 FragPos;  
  
    uniform vec3 lightPos; 
    uniform vec3 viewPos; 
    uniform vec3 lightColor;
    uniform vec3 objectColor;

    void main()
    {
        // ambient
        float ambientStrength = 0.1;
        vec3 ambient = ambientStrength * lightColor;
    
        // diffuse 
        vec3 norm = normalize(Normal);
        vec3 lightDir = normalize(lightPos - FragPos);
        float diff = max(dot(norm, lightDir), 0.0);
        vec3 diffuse = diff * lightColor;
    
        // specular
        float specularStrength = 0.16;
        vec3 viewDir = normalize(viewPos - FragPos);
        vec3 reflectDir = reflect(-lightDir, norm);  
        float spec = pow(max(dot(viewDir, reflectDir), 0.0), 32);
        vec3 specular = specularStrength * spec * lightColor;  
        
        vec3 result = (ambient + diffuse + specular) * objectColor;
        FragColor = vec4(result, 1.0);
    } 
  )glsl";
    //The fragment shader is compiled in exactly the same way
    GLuint fragmentShader=glCreateShader(GL_FRAGMENT_SHADER);
    glShaderSource(fragmentShader,1,&fragmentSource,NULL);
    glCompileShader(fragmentShader);
    //Fragment compile error message
    glGetShaderiv(fragmentShader, GL_COMPILE_STATUS, &success);
    if(!success)
    {
        glGetShaderInfoLog(fragmentShader, 512, NULL, infoLog);
        std::cout << "ERROR::SHADER::FRAGMENT::COMPILATION_FAILED
" << infoLog << '
';
    }
    //Combines shaders into one program
    GLuint shaderProgram=glCreateProgram();//Create shader program
    //Attatch vertex shader and fragment shader to new shader program
    glAttachShader(shaderProgram,vertexShader);
    glAttachShader(shaderProgram,fragmentShader);
    glLinkProgram(shaderProgram);//Links shader program
    //Shader program linking error message
    int InfoLogLength;
    glGetProgramiv(shaderProgram, GL_INFO_LOG_LENGTH, &InfoLogLength);
    if (InfoLogLength > 0) {
        std::vector<char> ProgramErrorMessage(InfoLogLength+1);
        glGetProgramInfoLog(shaderProgram, InfoLogLength, NULL, &ProgramErrorMessage[0]);
        std::cout<<&ProgramErrorMessage[0]<<'
';
    }
    //To actually start using the shaders in the program, you just have to call:
    glUseProgram(shaderProgram);

    // first, configure the cube's VAO (and VBO)
    unsigned int VBO, cubeVAO;
    glGenVertexArrays(1, &cubeVAO);
    glGenBuffers(1, &VBO);

    glBindBuffer(GL_ARRAY_BUFFER, VBO);

    std::vector< glm::vec3 > vertices,normals;
    std::vector< glm::vec2 > uvs;
    loadObj("teapot.obj",vertices,uvs,normals,1);
    int vert_size=vertices.size();
    glBufferData(GL_ARRAY_BUFFER, vert_size * sizeof(glm::vec3), &vertices[0], GL_STATIC_DRAW);//Now that our VBO is active we can copy the vertex data to it

    glBindVertexArray(cubeVAO);

    //position attribute
    glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);//Specify how the data for that input is retrieved from the array
    glEnableVertexAttribArray(0);
    //normal attribute
    glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE,0,0);
    glEnableVertexAttribArray(1);

    // second, configure the light's VAO (VBO stays the same; the vertices are the same for the light object which is also a 3D cube)
    /*unsigned int lightVAO;
    glGenVertexArrays(1, &lightVAO);
    glBindVertexArray(lightVAO);

    glBindBuffer(GL_ARRAY_BUFFER, VBO);
    // note that we update the lamp's position attribute's stride to reflect the updated buffer data
    glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)0);
    glEnableVertexAttribArray(0);*/

    glUniformMatrix4fv(glGetUniformLocation(shaderProgram,"projection"),1,GL_FALSE,glm::value_ptr(glm::perspective(45.0f,win_width/win_height,0.1f,100.0f)));
    glUniformMatrix4fv(glGetUniformLocation(shaderProgram,"model"),1,GL_FALSE,glm::value_ptr(glm::translate(glm::scale(glm::mat4(1.0f),glm::vec3(1.f)),glm::vec3(0.f,0.f,0.f))));
    glProgramUniform3f(shaderProgram, glGetUniformLocation(shaderProgram, "objectColor"), 1.0f, 0.5f, 0.f);
    glProgramUniform3f(shaderProgram, glGetUniformLocation(shaderProgram, "lightColor"), 1.0f, 1.0f, 1.0f);
    glm::vec3 lightPos=glm::vec3(1.2f, 6.f, 8.f);
    glProgramUniform3f(shaderProgram, glGetUniformLocation(shaderProgram, "lightPos"),lightPos.x,lightPos.y,lightPos.z);
    glProgramUniform3f(shaderProgram, glGetUniformLocation(shaderProgram, "viewPos"),cameraPos.x,cameraPos.y,cameraPos.z);

    //While the window is open
    while(!glfwWindowShouldClose(window)){
        
        //FPS counter (Frames per second)
        
        current_time=glfwGetTime();
        
        if (current_time - last_time < 1.0f){
            ++frames;
        }else{
            std::cout<<frames<<'
';
            frames=0;
            last_time=current_time;
        }
        

        cameraSpeed = 2.5f * (current_time - lastFrame);
        lastFrame = current_time;
        if (glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS){
            glfwSetWindowMonitor(window,NULL,0,0,win_width,win_height,GLFW_DONT_CARE);
            glfwSetInputMode(window, GLFW_CURSOR, GLFW_CURSOR_NORMAL);
        }
        if (glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS)
            cameraPos += cameraSpeed * cameraFront;
        if (glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS)
            cameraPos -= cameraSpeed * cameraFront;
        if (glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS)
            cameraPos -= glm::normalize(glm::cross(cameraFront, glm::vec3(0.0f, 1.0f, 0.0f))) * cameraSpeed;
        if (glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS)
            cameraPos += glm::normalize(glm::cross(cameraFront, glm::vec3(0.0f, 1.0f, 0.0f))) * cameraSpeed;
        if (glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS)
            cameraPos += cameraSpeed * glm::vec3(0.0f, 1.0f, 0.0f);
        if (glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS)
            cameraPos -= cameraSpeed * glm::vec3(0.0f, 1.0f, 0.0f);
        /*if (glfwGetKey(window, GLFW_KEY_UP) == GLFW_PRESS){
            lightPos.z-=0.5;
            std::cout<<glm::to_string(lightPos)<<'
';
        }
        if (glfwGetKey(window, GLFW_KEY_DOWN) == GLFW_PRESS){
            lightPos.z+=0.5;
            std::cout<<glm::to_string(lightPos)<<'
';
        }
        if (glfwGetKey(window, GLFW_KEY_RIGHT) == GLFW_PRESS){
            lightPos.x+=0.5;
            std::cout<<glm::to_string(lightPos)<<'
';
        }
        if (glfwGetKey(window, GLFW_KEY_LEFT) == GLFW_PRESS){
            lightPos.x-=0.5;
            std::cout<<glm::to_string(lightPos)<<'
';
        }
        if (glfwGetKey(window, GLFW_KEY_EQUAL) == GLFW_PRESS){
            lightPos.y+=0.5;
            std::cout<<glm::to_string(lightPos)<<'
';
        }
        if (glfwGetKey(window, GLFW_KEY_MINUS) == GLFW_PRESS){
            lightPos.y-=0.5;
            std::cout<<glm::to_string(lightPos)<<'
';
        }*/

        glClearColor(0.5f,0.5f,0.5f,0.0f);
        glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
        glUniformMatrix4fv(glGetUniformLocation(shaderProgram,"view"),1,GL_FALSE,glm::value_ptr(glm::lookAt(cameraPos, cameraPos + cameraFront, glm::vec3(0.0f, 1.0f, 0.0f))));
        glProgramUniform3f(shaderProgram, glGetUniformLocation(shaderProgram, "viewPos"),cameraPos.x,cameraPos.y,cameraPos.z);
        //glProgramUniform3f(shaderProgram, glGetUniformLocation(shaderProgram, "lightPos"),lightPos.x,lightPos.y,lightPos.z);
        glDrawArrays(GL_TRIANGLES,0,vert_size);
        glfwSwapBuffers(window);
        glfwPollEvents();
    }
    glDeleteVertexArrays(1,&cubeVAO);
    glDeleteBuffers(1,&VBO);
    glfwTerminate();
    return 0;//A 0 returned to the main function indicates a successful run
}

What do you mean by “slow”? What timings are you getting (and for what)? You’re only rendering one teapot.

A few thoughts:


        Normal = mat3(transpose(inverse(model))) * aNormal;  

Yeah… don’t do this. You’re inverting and transposing a matrix for every single vertex you throw down the pipe (worst-case). Instead, compute this on the CPU and pass it into the shader using a uniform mat3. Also, depending on what kind of transforms you add to your model transform, you may be able to just use the upper-left 3x3 of the model transform itself for your “normal transform”.

Just for timing purposes, comment out this line, replace it with one that just sets Normal to vec3(0,0,1), and compare your performance before/after. Be sure to disable VSync and do your timing properly so you can measure delta frame time (in ms) .

Also, I’m a little puzzled because it looks like you’re trying to tell GL to read your positions as normals too:


  //position attribute
  glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);//Specify how the data for that input is retrieved from the array
  glEnableVertexAttribArray(0);
  //normal attribute
  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE,0,0);
  glEnableVertexAttribArray(1);

Dark photon has spoken!

[QUOTE=Dark Photon;1291346]What do you mean by “slow”? What timings are you getting (and for what)? You’re only rendering one teapot.

A few thoughts:


        Normal = mat3(transpose(inverse(model))) * aNormal;  

Yeah… don’t do this. You’re inverting and transposing a matrix for every single vertex you throw down the pipe (worst-case). Instead, compute this on the CPU and pass it into the shader using a uniform mat3. Also, depending on what kind of transforms you add to your model transform, you may be able to just use the upper-left 3x3 of the model transform itself for your “normal transform”.

Just for timing purposes, comment out this line, replace it with one that just sets Normal to vec3(0,0,1), and compare your performance before/after. Be sure to disable VSync and do your timing properly so you can measure delta frame time (in ms) .

Also, I’m a little puzzled because it looks like you’re trying to tell GL to read your positions as normals too:


  //position attribute
  glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);//Specify how the data for that input is retrieved from the array
  glEnableVertexAttribArray(0);
  //normal attribute
  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE,0,0);
  glEnableVertexAttribArray(1);

[/QUOTE]

Thanks for your response.

My program runs at approximately 11-14 frames per second when rendering the single teapot. I know that this has nothing to do with my computer as I am using a Razer Blade 14" with GTX 1060 graphics card (you can see the tech specs at the bottom of this page). It also happens to run less than 1 frame per second on my chromebook.

I set Normal to vec3(0,0,1) but it did not make a difference as far as I could tell.

I am relatively new to OpenGL so I am not 100% sure how to respond to “I’m a little puzzled because it looks like you’re trying to tell GL to read your positions as normals too.” What I was using before was not working so I just tried random stuff until


  //position attribute
  glVertexAttribPointer(0,3,GL_FLOAT,GL_FALSE,0,0);//Specify how the data for that input is retrieved from the array
  glEnableVertexAttribArray(0);
  //normal attribute
  glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE,0,0);
  glEnableVertexAttribArray(1);

happened to work out for me.

That’s not good. That’s about 90 ms/frame. A typical LCD VSync is 60Hz which is 16.6ms/frame.

I know that this has nothing to do with my computer as I am using a Razer Blade 14" with GTX 1060 graphics card (you can see the tech specs at the bottom of this page).

Yeah, you should be easily able to do better than that. NVidia makes good GL drivers.

My bet is you are either not rendering on the NVidia GPU (typically called the “high-performance GPU” in app settings), and/or you are falling into a software (non-GPU) rendering path – possibly due to the former.

See these:
http://www.tomshardware.com/answers/id-3001113/high-performance-gpu-option.html
https://forums.geforce.com/default/topic/555317/geforce-drivers/where-is-the-quot-use-high-performance-gpu-quot-option-/1/

For what it’s worth, I downloaded and compiled your source code. I couldn’t run it because I of course didn’t have “teapot.obj”, but I did substitute a single triangle in the vertices/normals/uvs arrays, and it did run successfully.

With that one triangle, I got 59 fps with your current draw loop (effectively the 60Hz default VSync rate of my LCD monitor with VSync enabled). This is ~16.6ms/frame. When I disabled VSync, I found that I got ~5000 fps, with a per-frame timer confirming each frame was consuming only 0.2ms. Both much less than your 90 ms/frame. I wasn’t testing with your teapot, but that shouldn’t make much difference here unless your teapot has many millions of triangles in it. This is running on NVidia’s GL drivers with an old GeForce GTX 760 GPU.

I am relatively new to OpenGL so I am not 100% sure how to respond to “I’m a little puzzled because it looks like you’re trying to tell GL to read your positions as normals too.” What I was using before was not working so I just tried random stuff until

Ok, well I wouldn’t recommend trying random stuff as a way to learn anything including OpenGL. Take a look at your glVertexAttribPointer calls. Notice that you are providing the same arguments to both calls except for the attribute index (with the same GL_ARRAY_BUFFER bound). This means you are telling both attributes to read the exact same data into each attribute, which is probably not what you intended.

With that one triangle, I got 59 fps with your current draw loop (effectively the 60Hz default VSync rate of my LCD monitor with VSync enabled).

I have tried the program with a cube. With the cube it also runs at 58-60 frames per second. The program seems to get exponentially slower as I add more vertices and faces to my models. I have tried a number of online .obj files and I have tried 2 of my own that I made in blender.

I wasn’t testing with your teapot, but that shouldn’t make much difference here unless your teapot has many millions of triangles in it.

I am not sure exactly how many triangles are in the file but the file has a total of 9965 lines. This really doesn’t seem to be much compared to some of the others that I have found online or made myself. I have a tree .obj file that has 2942 total lines and it runs at 37-28 frames per second by itself. Keyboard input with the low-poly tree lags by approximately 2 seconds which is actually pretty long.

My bet is you are either not rendering on the NVidia GPU (typically called the “high-performance GPU” in app settings), and/or you are falling into a software (non-GPU) rendering path – possibly due to the former.

I checked and I am using the GTX 1060 and the nvidia-driver-390.

low poly “tree.obj”:

# Blender v2.79 (sub 0) OBJ File: ''
# [www.blender.org](http://www.blender.org)
mtllib tree_model.mtl
o Cube.002
v -0.494339 4.220548 1.693390
v 1.148390 4.025903 0.472376
v 0.636061 4.956030 1.777606
v 0.702187 4.468359 0.005329
v 0.087319 3.451966 1.620765
v 0.622995 3.662630 1.531211
v 0.669957 3.849302 0.230463
v -0.778402 3.711006 0.898752
v -0.316106 3.604835 0.489693
v 1.292720 4.399176 1.150831
v 1.271598 4.488678 0.587576
v 0.407860 4.319372 2.058455
v 0.879689 4.395326 1.673027
v -0.209225 4.266788 -0.120574
v -0.996091 4.497072 0.882450
v -0.380400 5.114817 1.428376
v 0.533210 5.095462 1.080542
v -0.894238 5.002576 1.311229
v -0.432074 4.950055 0.424518
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usemtl (null)
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usemtl (null)
s off
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usemtl (null)
s off
f 542//265 156//265 147//265
f 156//266 541//266 147//266
f 148//267 423//267 375//267
f 149//268 580//268 368//268
f 150//269 567//269 364//269
f 151//270 532//270 359//270
f 154//271 538//271 375//271
f 190//272 565//272 374//272
f 155//273 425//273 423//273
f 423//274 148//274 155//274
f 156//275 542//275 422//275
f 539//276 161//276 157//276
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Here are the counts for your teapot model:


   1176 f
   1144 vn
    610 v

So 1176 faces (all triangles) pulling from 610 vertex positions. You’re not doing anything with the normals right now.

Since you’re not using indexed vertices, the total vertices your loadObj() “should” return is 3*1176 = 3,528. This is a tiny number of vertices to draw for an entire frame.

However, due to some bugs in your loadObj() parser (one really nasty one), I think you’ll find you are not returning 3,528 vertices but rather 3,228,372 vertices for this model.

Note: To get your loadObj() parser to even work on this obj file, I had to change facetype to 2. Once I did that, I got 21ms (48Hz w/o VSync) running with your existing loadObj() bugs. Once I fixed the worst one, I was only loading 3528 vertices and my frame time was reduced to 0.25ms (~4000Hz).

I checked and I am using the GTX 1060 and the nvidia-driver-390.

Sounds good. Using 378.13 here. Just haven’t updated my driver in a while.

To save you the trouble of figuring out why that is: the loop which copies the vertices to [var]out_vertices[/var] should be moved outside of the main parsing loop. As it stands, each iteration of the parsing loop appends all vertices of all triangles found so far to [var]out_vertices[/var]. So each triangle is duplicated as many times as there are lines following its definition (not just “f” commands, but anything that causes another iteration of the parsing loop).

Previously you said:

It’s not actually exponential, just quadratic. But that still means that you’re rendering 1,076,124 triangles for a file which only contains 1176 triangles.

Thank you so much for your help :D. I think that you forgot to say what the really nasty bug was but that’s alright because GClements figured it out too. My teapot now runs at 60 frames per second in my program.

However, due to some bugs in your loadObj() parser (one really nasty one), I think you’ll find you are not returning 3,528 vertices but rather 3,228,372 vertices for this model.

I am wondering as to what the other bugs are though.

Notice that you are providing the same arguments to both calls except for the attribute index (with the same GL_ARRAY_BUFFER bound). This means you are telling both attributes to read the exact same data into each attribute, which is probably not what you intended.

Also, what arguments do you suppose that I provide to the calls in this situation?

Thanks again

To save you the trouble of figuring out why that is: the loop which copies the vertices to out_vertices should be moved outside of the main parsing loop.

Yep that did it :D! Thanks for the help. My program now runs at 60 frames per second (with vsync) with the teapot.

First, you need to copy the normals and texture coordinates into a buffer (either the same buffer as the positions or a different buffer), then pass the appropriate offset (with that buffer bound).

If you step though your parser in a debugger and look at how you’re parsing, it’ll be pretty obvious. For instance, you’re trying to substrings in a comment as tokens.

I still do not understand what you mean. Where are my normals and texture coordinates and how do I “copy the normals and texture coordinates into a buffer”? Then how do I “pass the appropriate offset”? I am not sure how buffers work, what normals are, or why I need to include normals in my shader in the first place.

In what part of my code am I “trying to substrings in a comment as tokens” and what exactly does that mean?

Sorry, I missed a word in there. Should have been: “you’re trying to parse substrings in a comment as tokens.”

What are substrings and tokens?

[ul]
[li]Substring (Wikipedia)[/li][li]Lexical Token (Wikipedia)[/li][/ul]