my simple OpenGL program can't draw a model load by assimp - c++

Question

I divide my code to two cpp files, one cpp contains main()function and another one contains model loading codes.
here's the first part
#define STB_IMAGE_IMPLEMENTATION
//OpenGL relations
#include "stb_image.h"
#include <glad/glad.h>
#include <GLFW/glfw3.h>
//math and time
#include <math.h>
#include <cstdio>
#include <time.h>
#include <iostream>
//matrix
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
//
#include "modelload.h"
// const values here //
const char* defaultpath = "woodenbox.jpeg";
const char* cottagetex = "cottage.fbx";
const char* vertexShaderSource = "#version 330 core\n"
"layout (location = 0) in vec3 aPos;\n"
"layout (location = 1) in vec2 aTexCoord;\n"
"out vec2 TexCoord;\n"
"uniform mat4 transform;\n"
"void main()\n"
"{\n"
" gl_Position = transform * vec4(aPos.x, aPos.y, aPos.z, 1.0f);\n"
" TexCoord = aTexCoord;\n"
"}\0";
const char* fragmentShaderSource = "#version 330 core\n"
"out vec4 FragColor;\n"
"in vec2 TexCoord;\n"
"uniform sampler2D ourTexture;\n"
"void main()\n"
"{\n"
" FragColor = texture(ourTexture, TexCoord);\n"
"}\n\0";
// functions here //
void framebuffer_size_callback(GLFWwindow* window, int width, int height)
{
glViewport(0, 0, width, height);
}
void loadtexture(unsigned int& texture, const char* path = defaultpath) {
int width, height, nrChannels;
unsigned char* data = stbi_load(path, &width, &height, &nrChannels, 4);
glGenTextures(1, &texture);
//glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture);
if (data)
{
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, width, height, 0, GL_RGB, GL_UNSIGNED_BYTE, data);
glGenerateMipmap(GL_TEXTURE_2D);
}
else
{
std::cout << "Failed to load texture" << std::endl;
}
}
void renderInit(unsigned int& shaderProgram) {
unsigned int vertexShader, fragmentShader;
vertexShader = glCreateShader(GL_VERTEX_SHADER);
glShaderSource(vertexShader, 1, &vertexShaderSource, NULL);
glCompileShader(vertexShader);
fragmentShader = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(fragmentShader, 1, &fragmentShaderSource, NULL);
glCompileShader(fragmentShader);
shaderProgram = glCreateProgram();
glAttachShader(shaderProgram, vertexShader);
glAttachShader(shaderProgram, fragmentShader);
glLinkProgram(shaderProgram);
}
// main function //
int main(int argc, char* argv[])
{
//初始化glfw
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
#ifdef __APPLE__
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
#endif
// glfw window creation
// --------------------
GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL-1", NULL, NULL);
if (window == NULL)
{
std::cout << "Failed to create GLFW window" << std::endl;
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
// glad: load all OpenGL function pointers
// ---------------------------------------
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress))
{
std::cout << "Failed to initialize GLAD" << std::endl;
return -1;
}
//渲染初始化，生成着色器程序、VAO、顶点初始数据
clock_t start, ends;
start = clock();
//build shader
unsigned int shaderProgram;
renderInit(shaderProgram);
unsigned int texture;
glGenTextures(1, &texture);
// 为当前绑定的纹理对象设置环绕、过滤方式
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);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
loadtexture(texture);
model* ct1 = new model(cottagetex);
glm::mat4 ori_trans = glm::mat4(1.0f);
glm::mat4 view_trans = glm::lookAt(glm::vec3(0.0f, 0.0f, 3.0f),
glm::vec3(0.0f, 0.0f, 0.0f),
glm::vec3(0.0f, 1.0f, 0.0f));//glm::translate(ori_trans, glm::vec3(0.0f, 0.0f, -3.0f));
glm::mat4 proj_trans = glm::perspective(glm::radians(45.0f), (float)(800 / 600), 0.1f, 100.0f);
glm::mat4 rotate_trans = glm::mat4(1.0f);
unsigned int count = 0;
float radius = 10.0f;
glEnable(GL_DEPTH_TEST);
// initialization completed
while (!glfwWindowShouldClose(window))
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
float camX = sin(glfwGetTime()) * radius;
float camZ = cos(glfwGetTime()) * radius;
view_trans = glm::lookAt(glm::vec3(camX, 0.0, camZ), glm::vec3(0.0, 0.0, 0.0), glm::vec3(0.0, 1.0, 0.0));
//glEnableVertexAttribArray(0);
glUseProgram(shaderProgram);
rotate_trans = proj_trans * view_trans * glm::rotate(ori_trans, glm::radians((float)((clock() - start) - cos(clock() - start) * 4) / 40), glm::vec3(1.0, 1.0, -1.0));
unsigned int transformLoc = glGetUniformLocation(shaderProgram, "transform");
glUniformMatrix4fv(transformLoc, 1, GL_FALSE, glm::value_ptr(rotate_trans));
ct1->draw();
//glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_INT, 0);
rotate_trans = glm::translate(proj_trans * view_trans, glm::vec3(1.0f, 1.0f, -3.0f));
glUniformMatrix4fv(transformLoc, 1, GL_FALSE, glm::value_ptr(rotate_trans));
ct1->draw();
//glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_INT, 0);
//std::cout << count << " frame updated" << (float)-(0.25 + sin(clock() - start) / 4) << std::endl;
count++;
glfwSwapBuffers(window);
glfwPollEvents();
}
/*
glDeleteVertexArrays(1, &VAO);
glDeleteBuffers(1, &VBO);
glDeleteBuffers(1, &EBO);
*/
glDeleteProgram(shaderProgram);
glfwTerminate();
return 0;
}
and the second part
//OpenGL relations
#include <glad/glad.h>
#include <GLFW/glfw3.h>
//math and time
#include <math.h>
#include <vector>
#include <time.h>
#include <iostream>
//matrix
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
//assets
#include <assimp/Importer.hpp>
#include <assimp/scene.h>
#include <assimp/postprocess.h>
struct Vertex {
glm::vec3 Position;
glm::vec2 TexCoords;
glm::vec3 Normal;
};
class Mesh {
public:
/* 网格数据 */
std::vector<Vertex> vertices;
std::vector<unsigned int> indices;
//std::vector<unsigned int> textures;// materials
/* 函数 */
Mesh(std::vector<Vertex> vertices, std::vector<unsigned int> indices) {
this->vertices = vertices;
this->indices = indices;
}//, std::vector<unsigned int> textures
void Draw();
void setupMesh();
private:
/* 渲染数据 */
unsigned int VAO, VBO, EBO;
/* 函数 */
};
class model {
public:
model(const char* path);
void draw();
private:
std::vector<Mesh> meshes;
void processnode(aiNode* node, const aiScene* scene);
Mesh processmesh(aiMesh* mesh, const aiScene* scene);
// loadmaterials
};
#include "modelload.h"
//STL vector in namespace std
void Mesh::setupMesh() {
/*
for (int i = 0; i < vertices.size(); i++) {
std::cout<<vertices[i].Position.x<<std::endl;
}
*/
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
//std::cout << sizeof(Vertex) << std::endl;
glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), &vertices[0], GL_DYNAMIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ARRAY_BUFFER, indices.size() * sizeof(unsigned int), &indices[0], GL_DYNAMIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)0);
glEnableVertexAttribArray(0);
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
//glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)(5 * sizeof(float)));
//glEnableVertexAttribArray(2);
//glBindVertexArray(0);// reload VAO before rendering
}
void Mesh::Draw() {
//std::cout << vertices.size() << std::endl; //vertices:988 indices:1434
glDrawElements(GL_TRIANGLES, indices.size(), GL_UNSIGNED_INT, 0);
}
model::model(const char* path) {
Assimp::Importer import;
const aiScene* scene = import.ReadFile(path, aiProcess_Triangulate | aiProcess_FlipUVs);
if (!scene || scene->mFlags & AI_SCENE_FLAGS_INCOMPLETE || !scene->mRootNode)
{
std::cout << "ERROR::ASSIMP::" << import.GetErrorString() << std::endl;
return;
}
processnode((scene->mRootNode), scene);
}
void model::processnode(aiNode* node, const aiScene* scene) {
for (int i = 0; i < node->mNumMeshes; i++) {
meshes.push_back(processmesh(scene->mMeshes[node->mMeshes[i]], scene));
meshes.back().setupMesh();
}
for (int i = 0; i < node->mNumChildren; i++) {
processnode(node->mChildren[i], scene);
}
}
Mesh model::processmesh(aiMesh* mesh, const aiScene* scene) {
std::vector<Vertex> vertices;
std::vector<unsigned int> indices;
for (int i = 0; i < (mesh->mNumVertices); i++) {
Vertex tvertex;
tvertex.Position.x = mesh->mVertices[i].x/3;
tvertex.Position.y = mesh->mVertices[i].y/3;
tvertex.Position.z = mesh->mVertices[i].z/3;
tvertex.Normal.x = mesh->mNormals[i].x;
tvertex.Normal.y = mesh->mNormals[i].y;
tvertex.Normal.z = mesh->mNormals[i].z;
tvertex.TexCoords.x = mesh->mTextureCoords[0][i].x;
tvertex.TexCoords.y = mesh->mTextureCoords[0][i].y;
vertices.push_back(tvertex);
//std::cout << tvertex.Position.x<<" "<< tvertex.Position.y<<" "<< tvertex.Position.z << std::endl;
//std::cout << tvertex.TexCoords.x << " " << tvertex.TexCoords.y << std::endl;
}
for (unsigned int i = 0; i < mesh->mNumFaces; i++)
{
aiFace face = mesh->mFaces[i];
for (unsigned int j = 0; j < face.mNumIndices; j++)
indices.push_back(face.mIndices[j]);
}
return Mesh(vertices, indices);
}
void model::draw() {
for (int i = 0; i < meshes.size(); i++) {
//std::cout << i << std::endl;
meshes[i].Draw();
}
}
It can only draw the background color, but it works when I draw a model I made by myself like:
-0.5, -0.5f, 0.5f, 0.0f,0.0f,//left bottom front 0
-0.5, 0.5f, 0.5f, 0.0f,1.0f,//left ceil front 1
0.5, 0.5f, 0.5f, 1.0f,1.0f,//right ceil front 2
0.5, -0.5f, 0.5f, 1.0f,0.0f,//right bottom front 3
-0.5, -0.5f, -0.5f, 1.0f,0.0f,//left bottom behind 4
-0.5, 0.5f, -0.5f, 1.0f,1.0f,//left ceil behind 5
0.5, 0.5f, -0.5f, 0.0f,1.0f,//right ceil behind 6
0.5, -0.5f, -0.5f, 0.0f,0.0f//right bottom behind 7
};
unsigned int indices[] = { // note that we start from 0!
0, 1, 2,
0, 2, 3,
0, 4, 1,
1, 4, 5,
1, 2, 6,
1, 6, 5,
4, 5, 6,
4, 6, 7,
2, 3, 7,
2, 7, 6,
0, 3, 4,
4, 7, 3
};
I checked memory where the model data is, it seems like many same points was loaded.
enter image description here