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#include "skybox.h"
#include "stb/stb_image.h"
#include <iostream>
#include <Eigen/Core>
#include <Eigen/Dense>
#include <Eigen/Sparse>
#include <Eigen/Geometry>
skybox::skybox()
{
//initializeVAO();
}
void skybox::initializeVAO(){
sky_shape.init(m_vertices_eigen, m_faces);
// std::cout << "hehee" << std::endl;
skybox_tex = loadCubeMap(m_skyboxTextureFiles);
glGenVertexArrays(1, &VAO);
glGenBuffers(1, &VBO);
glBindVertexArray(VAO);
glBindBuffer(GL_ARRAY_BUFFER, VBO);
glBufferData(GL_ARRAY_BUFFER, m_vertices.size()*sizeof(float), m_vertices.data(), GL_STATIC_DRAW);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3*sizeof(float), (void*)0);
// unbind
glEnableVertexAttribArray(0);
glBindBuffer(GL_ARRAY_BUFFER, 0);
}
void skybox::draw(Shader *skybox_shader, Camera m_camera){
glDepthFunc(GL_LEQUAL);
glDisable(GL_CULL_FACE);
skybox_shader->bind();
Eigen::Vector3f sc = Eigen::Vector3f(.77f, .85f, .99f); // skycolor for fade effect
glUniform3f(glGetUniformLocation(skybox_shader->id(), "skyColor"), sc[0], sc[1], sc[2]);
// activate texture
glActiveTexture(GL_TEXTURE9);
glBindTexture(GL_TEXTURE_CUBE_MAP, skybox_tex);
glUniform1i(glGetUniformLocation(skybox_shader->id(), "cubeMap"), 9); // bind texture at slot 9
// manually set view and projection, for non-translating view
Eigen::Matrix4f projection = m_camera.getProjection();
Eigen::Matrix4f view = m_camera.getView();
view.col(3) = Eigen::Vector4f(0, 0, 0, 0);
glUniformMatrix4fv(glGetUniformLocation(skybox_shader->id(), "view"), 1, GL_FALSE, view.data());
glUniformMatrix4fv(glGetUniformLocation(skybox_shader->id(), "projection"), 1, GL_FALSE, projection.data());
// skybox_shader->setUniform("projection", projection);
// skybox_shader->setUniform("view", view);
// apply rotation matrix
skybox_shader->setUniform("rotation", m_rotation_mat);
glBindVertexArray(VAO);
glDrawArrays(GL_TRIANGLES, 0, m_vertices.size());
glDepthFunc(GL_LESS);
skybox_shader->unbind();
}
void skybox::update(double deltaTime){
m_rotation += ROTATE_SPEED * deltaTime;
auto sinA = std::sin(m_rotation / 2);
auto cosA = std::cos(m_rotation/ 2);
Eigen::Quaternionf q;
q.x() = 0 * sinA;
q.y() = 1 * sinA;
q.z() = 0 * sinA;
q.w() = cosA;
Eigen::Matrix3f mat3 = q.toRotationMatrix();
Eigen::Matrix4f mat4 = Eigen::Matrix4f::Identity();
mat4.block(0,0,3,3) = mat3;
m_rotation_mat = mat4;
}
GLuint skybox::loadCubeMap(std::vector<const char*> textureFiles){
// create empty texture
GLuint textureID;
glGenTextures(1, &textureID);
std::cout << "hello fssd" << std::endl;
//glActiveTexture(GL_TEXTURE3);
glBindTexture(GL_TEXTURE_CUBE_MAP, textureID);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER,GL_LINEAR);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
GLuint target = GL_TEXTURE_CUBE_MAP_POSITIVE_X;
for (int i=0; i<6; i++){
std::cout << i << std::endl;
std::string filename = std::string(textureFiles[i]);//directory + '/' + filename;
QString sky_texture_filepath = QString(filename.c_str());
QImage box_image = QImage(sky_texture_filepath);
box_image = box_image.convertToFormat(QImage::Format_RGBA8888);
auto data = box_image.bits();
int width = box_image.width();
int height = box_image.height();
if (data){
glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + i, 0, GL_RGBA, width, height, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
} else {
std::cout << "Texture failed to load at path: " << textureFiles[i] << std::endl;
}
}
return textureID;
}
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