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#include <iostream>
#include <chrono>
#include <algorithm>
#include <cpplocate/cpplocate.h>
#include <cpplocate/ModuleInfo.h>
#include <glm/glm.hpp>
#include <glm/gtx/transform.hpp>
#include <glbinding/gl/gl.h>
#include <glbinding/ContextInfo.h>
#include <glbinding/Version.h>
#include <GLFW/glfw3.h>
#include <globjects/globjects.h>
#include <globjects/base/File.h>
#include <globjects/logging.h>
#include <globjects/Uniform.h>
#include <globjects/Program.h>
#include <globjects/Shader.h>
#include "Icosahedron.h"
#include "datapath.inl"
using namespace gl;
namespace
{
globjects::Program * g_sphere = nullptr;
Icosahedron * g_icosahedron = nullptr;
glm::mat4 g_viewProjection;
const std::chrono::high_resolution_clock::time_point g_starttime = std::chrono::high_resolution_clock::now();
auto g_size = glm::ivec2{};
}
void resize()
{
static const auto fovy = glm::radians(40.f);
static const auto zNear = 1.f;
static const auto zFar = 16.f;
static const auto eye = glm::vec3{ 0.f, 1.f, 4.f };
static const auto center = glm::vec3{ 0.0, 0.0, 0.0 };
static const auto up = glm::vec3{ 0.0, 1.0, 0.0 };
const auto aspect = static_cast<float>(g_size.x) / glm::max(static_cast<float>(g_size.y), 1.f);
g_viewProjection = glm::perspective(fovy, aspect, zNear, zFar) * glm::lookAt(eye, center, up);
}
void initialize()
{
g_sphere = new globjects::Program();
g_sphere->ref();
const auto dataPath = common::retrieveDataPath("globjects", "dataPath");
g_sphere->attach(
globjects::Shader::fromFile(GL_VERTEX_SHADER, dataPath + "tessellation/sphere.vert")
, globjects::Shader::fromFile(GL_TESS_CONTROL_SHADER, dataPath + "tessellation/sphere.tcs")
, globjects::Shader::fromFile(GL_TESS_EVALUATION_SHADER, dataPath + "tessellation/sphere.tes")
, globjects::Shader::fromFile(GL_GEOMETRY_SHADER, dataPath + "tessellation/sphere.geom")
, globjects::Shader::fromFile(GL_FRAGMENT_SHADER, dataPath + "tessellation/sphere.frag")
, globjects::Shader::fromFile(GL_FRAGMENT_SHADER, dataPath + "tessellation/phong.frag"));
g_icosahedron = new Icosahedron();
g_icosahedron->ref();
resize();
}
void deinitialize()
{
g_sphere->unref();
g_icosahedron->unref();
}
void draw()
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
const auto t_elapsed = std::chrono::high_resolution_clock::now() - g_starttime;
const auto t = static_cast<float>(t_elapsed.count()) * 4e-10f;
glm::mat4 R = glm::rotate(t * 1.f, glm::vec3(sin(t * 0.321f), cos(t * 0.234f), sin(t * 0.123f)));
g_sphere->setUniform("transform", g_viewProjection);
g_sphere->setUniform("rotation", R);
const auto level = static_cast<int>((sin(t) * 0.5f + 0.5f) * 16) + 1;
g_sphere->setUniform("level", level);
g_sphere->use();
glViewport(0, 0, g_size.x, g_size.y);
glPatchParameteri(GL_PATCH_VERTICES, 3);
g_icosahedron->draw(GL_PATCHES);
g_sphere->release();
}
void error(int errnum, const char * errmsg)
{
globjects::critical() << errnum << ": " << errmsg << std::endl;
}
void framebuffer_size_callback(GLFWwindow * /*window*/, int width, int height)
{
g_size = glm::ivec2{ width, height };
resize();
}
void key_callback(GLFWwindow * window, int key, int /*scancode*/, int action, int /*modes*/)
{
if (key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE)
glfwSetWindowShouldClose(window, true);
if (key == GLFW_KEY_F5 && action == GLFW_RELEASE)
globjects::File::reloadAll();
}
int main(int /*argc*/, char * /*argv*/[])
{
// Initialize GLFW
if (!glfwInit())
return 1;
glfwSetErrorCallback(error);
glfwDefaultWindowHints();
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 0);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, true);
// Create a context and, if valid, make it current
GLFWwindow * window = glfwCreateWindow(640, 480, "globjects Tessellation", NULL, NULL);
if (window == nullptr)
{
globjects::critical() << "Context creation failed. Terminate execution.";
glfwTerminate();
return -1;
}
glfwSetKeyCallback(window, key_callback);
glfwSetFramebufferSizeCallback(window, framebuffer_size_callback);
glfwMakeContextCurrent(window);
// Initialize globjects (internally initializes glbinding, and registers the current context)
globjects::init();
std::cout << std::endl
<< "OpenGL Version: " << glbinding::ContextInfo::version() << std::endl
<< "OpenGL Vendor: " << glbinding::ContextInfo::vendor() << std::endl
<< "OpenGL Renderer: " << glbinding::ContextInfo::renderer() << std::endl << std::endl;
globjects::info() << "Press F5 to reload shaders." << std::endl << std::endl;
glfwGetFramebufferSize(window, &g_size[0], &g_size[1]);
initialize();
// Main loop
while (!glfwWindowShouldClose(window))
{
glfwPollEvents();
draw();
glfwSwapBuffers(window);
}
deinitialize();
// Properly shutdown GLFW
glfwTerminate();
return 0;
}
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