Nigel/LearnOpenGL
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Matrices and transformations

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Nigel Barink
2022-02-12 21:38:31 +01:00
parent 58cca1db34
commit 8bfdbccac1
11 changed files with 8170 additions and 40 deletions
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227
src/main.cpp
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@ -4,6 +4,12 @@
#include <glad/glad.h>
#include <GLFW/glfw3.h>
#include <glm/glm.hpp>
#include <glm/gtc/matrix_transform.hpp>
#include <glm/gtc/type_ptr.hpp>
#include "stb_image.h"
#include "shader.h"
@ -18,7 +24,7 @@ void processInput( GLFWwindow* window){
}
int main() {
printf("Hello OpenGL!");
printf("Hello OpenGL!\n");
glfwInit();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 6);
@ -27,14 +33,14 @@ int main() {
GLFWwindow* window = glfwCreateWindow(800, 600, "LearnOpenGL", NULL, NULL);
if( window == NULL){
printf("Failed to create GLFW window!");
printf("Failed to create GLFW window!\n");
glfwTerminate();
return -1;
}
glfwMakeContextCurrent(window);
if (!gladLoadGLLoader((GLADloadproc)glfwGetProcAddress)){
printf("Failed to initialize GLAD!");
printf("Failed to initialize GLAD!\n");
return -1;
}
@ -42,26 +48,64 @@ int main() {
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
Shader shader("shader.vs", "shader.fs");
float vertices[] = {
0.5f, -0.5f, 0.0f, 1.0f, 0.0f, 0.0f, // bottom right
-0.5f, -0.5f, 0.0f, 0.0f, 1.0f, 0.0f, // bottom left
0.0f, 0.5f, 0.0f, 0.0f, 0.0f, 1.0f // top
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
0.5f, -0.5f, -0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 0.0f,
};
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 1.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
unsigned int indices[] = {
0, 1,2 // first triangle
};
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
0.5f, -0.5f, -0.5f, 1.0f, 1.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
0.5f, -0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, -0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, -0.5f, -0.5f, 0.0f, 1.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f,
0.5f, 0.5f, -0.5f, 1.0f, 1.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
0.5f, 0.5f, 0.5f, 1.0f, 0.0f,
-0.5f, 0.5f, 0.5f, 0.0f, 0.0f,
-0.5f, 0.5f, -0.5f, 0.0f, 1.0f
};
/* unsigned int indices[] = {
0,1,3, // first triangle
1,2,3 // second triangle
}; */
// Vertex buffer objects!!
unsigned int VBO, VAO, EBO;
/* unsigned int VBO, VAO, EBO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glGenBuffers(1, &EBO);
@ -72,37 +116,166 @@ int main() {
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(indices), indices, GL_STATIC_DRAW); */
// Position attribute
glVertexAttribPointer(0,3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)0);
/* // Position attribute
glVertexAttribPointer(0,3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
// Color attribute
glVertexAttribPointer(1,3, GL_FLOAT, GL_FALSE, 6 * sizeof(float), (void*)(3* sizeof(float)));
glVertexAttribPointer(1,3, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(3* sizeof(float)));
glEnableVertexAttribArray(1);
glBindBuffer(GL_ARRAY_BUFFER, 0);
// texture attribute
glVertexAttribPointer(2,2, GL_FLOAT, GL_FALSE, 8 * sizeof(float), (void*)(6*sizeof(float)));
glEnableVertexAttribArray(2); */
glBindVertexArray(0);
unsigned int VBO, VAO;
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, sizeof(vertices), vertices, GL_STATIC_DRAW);
// position attribute
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)0);
glEnableVertexAttribArray(0);
// texture coord attribute
glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 5 * sizeof(float), (void*)(3 * sizeof(float)));
glEnableVertexAttribArray(1);
int width, height, nrChannels;
unsigned int texture1;
glGenTextures(1, &texture1);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture1);
glTextureParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTextureParameteri(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);
unsigned char* data = stbi_load("Textures/container.jpg", &width, &height, &nrChannels,0);
if(data){
std::cout<< width << " x " << height << std::endl;
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;
}
stbi_image_free(data);
int width2, height2, nrChannels2;
unsigned int texture2;
glGenTextures(1, &texture2);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, texture2);
glTextureParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTextureParameteri(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);
stbi_set_flip_vertically_on_load(true);
unsigned char* data2 = stbi_load("Textures/awesomeface.png", &width2, &height2, &nrChannels2,0);
if(data2){
std::cout<< width2 << " x " << height2 << std::endl;
glTexImage2D(GL_TEXTURE_2D,0, GL_RGB, width2, height2, 0, GL_RGBA, GL_UNSIGNED_BYTE, data2);
glGenerateMipmap(GL_TEXTURE_2D);
} else{
std::cout << "Failed to load texture!" << std::endl;
}
stbi_image_free(data2);
// WireFrame mode
// glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
shader.use();
shader.setInt("texture1",0);
shader.setInt("texture2",1);
glm::vec3 cubePositions[] = {
glm::vec3( 0.0f, 0.0f, 0.0f),
glm::vec3( 2.0f, 5.0f, -15.0f),
glm::vec3(-1.5f, -2.2f, -2.5f),
glm::vec3(-3.8f, -2.0f, -12.3f),
glm::vec3( 2.4f, -0.4f, -3.5f),
glm::vec3(-1.7f, 3.0f, -7.5f),
glm::vec3( 1.3f, -2.0f, -2.5f),
glm::vec3( 1.5f, 2.0f, -2.5f),
glm::vec3( 1.5f, 0.2f, -1.5f),
glm::vec3(-1.3f, 1.0f, -1.5f)
};
glEnable(GL_DEPTH_TEST);
while(!glfwWindowShouldClose(window))
{
processInput(window);
glClear(GL_COLOR_BUFFER_BIT);
glClearColor(0.2f, 0.3f, 0.3f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, texture1);
glActiveTexture(GL_TEXTURE1);
glBindTexture(GL_TEXTURE_2D, texture2);
// create transformations
glm::mat4 model = glm::mat4(1.0f); // make sure to initialize matrix to identity matrix first
glm::mat4 view = glm::mat4(1.0f);
glm::mat4 projection = glm::mat4(1.0f);
model = glm::rotate(model, (float)glfwGetTime(), glm::vec3(0.5f, 1.0f, 0.0f));
view = glm::translate(view, glm::vec3(0.0f, 0.0f, -3.0f));
projection = glm::perspective(glm::radians(45.0f), (float)800 / (float)600, 0.1f, 100.0f);
// Pass a matrix to the shader
unsigned int ModelMatrixLoc = glGetUniformLocation(shader.ID, "model");
glUniformMatrix4fv(ModelMatrixLoc, 1, GL_FALSE, glm::value_ptr(model));
unsigned int ViewMatrixLoc = glGetUniformLocation(shader.ID, "view");
glUniformMatrix4fv(ViewMatrixLoc, 1, GL_FALSE, &view[0][0]);
unsigned int ProjectionMatrixLoc = glGetUniformLocation(shader.ID, "projection");
glUniformMatrix4fv(ProjectionMatrixLoc, 1, GL_FALSE, &projection[0][0]);
shader.use();
shader.setFloat("HorizontalOffset", .3);
glBindVertexArray(VAO);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, EBO);
glDrawElements(GL_TRIANGLES, 6,GL_UNSIGNED_INT, 0);
for(unsigned int i = 0; i < 10; i++){
glm::mat4 model = glm::mat4(1.0);
model = glm::translate(model, cubePositions[i]);
float angle = 20.0f * i;
model = glm::rotate(model, (float)glfwGetTime() * glm::radians(angle), glm::vec3(1.0f, 0.3f, 0.5f));
shader.setMat4("model", model);
glDrawArrays(GL_TRIANGLES, 0, 36);
}
glfwSwapBuffers(window);
glfwPollEvents();

5
src/shader.h
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@ -20,6 +20,7 @@ class Shader
void setBool(const std::string &name, bool value)const;
void setInt(const std::string &name, int value)const;
void setFloat(const std::string &name, float value)const;
void setMat4(const std::string &name, glm::mat4 value)const;
};
@ -130,4 +131,8 @@ void Shader::setInt(const std::string &name, int value) const{
void Shader::setFloat(const std::string &name, float value) const{
glUniform1f(glGetUniformLocation(ID, name.c_str()), value );
}
void Shader::setMat4(const std::string &name, glm::mat4 value)const{
glUniformMatrix4fv(glGetUniformLocation(ID, name.c_str()), 1, GL_FALSE, &value[0][0] );
}

3
src/stb_image.cpp Normal file
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@ -0,0 +1,3 @@
#define STB_IMAGE_IMPLEMENTATION
#include "stb_image.h"

7897
src/stb_image.h Normal file
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