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#include "../include/RenderBackend/OpenGL/opengl.hpp"
#include "../include/RenderBackend/OpenGL/Shader.hpp"
#include "../include/RenderBackend/OpenGL/ShaderProgram.hpp"
#include "../include/RenderBackend/OpenGL/DeviceMemory.hpp"
#include "../include/RenderBackend/OpenGL/DeviceFrame.hpp"
#include "../include/Triangle.hpp"
#include "../include/model_loader/ObjModelLoader.hpp"
#include <cstdio>
#include <chrono>
// TODO: Creating buffers etc should be somehow created/drawn using the window object, since they are associated with the window
// opengl context
using namespace amalgine;
using namespace std;
static void glfwErrorHandler(int errorCode, const char *errorDescription);
static void initGlfw();
static void initGlew();
static GLFWwindow *createWindow();
static std::unique_ptr<Shader> load_shader_from_file(const char *filepath, Shader::Type shader_type);
static std::unique_ptr<ShaderProgram> build_shader_program_from_shaders(const std::vector<Shader*> &shaders);
struct Userdata {
float cam_dist;
};
int main()
{
initGlfw();
glfwSetErrorCallback(glfwErrorHandler);
GLFWwindow *window = createWindow();
int window_width = 1;
int window_height = 1;
glfwGetWindowSize(window, &window_width, &window_height);
DeviceFrame frame;
std::array<Triangle3D, 2> cpuTriangle = {
Triangle3D(
Vertex3D(0.0f, 0.0f, 0.0f),
Vertex3D(1.0f, 0.0f, 0.0f),
Vertex3D(0.0f, 1.0f, 0.0f)
),
Triangle3D(
Vertex3D(1.0f, 0.0f, 0.0f),
Vertex3D(1.0f, 1.0f, 0.0f),
Vertex3D(0.0f, 1.0f, 0.0f)
),
};
//DataView<Triangle3D> cpuTriangles(cpuTriangle.data(), cpuTriangle.size());
std::vector<Triangle3D> triangles;
ObjModelLoader::load_from_file("/home/dec05eba/Downloads/FinalBaseMesh.obj", triangles);
DataView<Triangle3D> cpuTriangles(triangles.data(), triangles.size());
DeviceMemory *gpuTriangle = frame.alloc();
gpuTriangle->copy(cpuTriangles, DeviceMemory::StorageType::STATIC);
std::unique_ptr<Shader> vertex_shader = load_shader_from_file("shaders/vertex.vert", Shader::Type::VERTEX);
std::unique_ptr<Shader> pixel_shader = load_shader_from_file("shaders/fragment.frag", Shader::Type::PIXEL);
std::unique_ptr<ShaderProgram> shader_program = build_shader_program_from_shaders({ vertex_shader.get(), pixel_shader.get() });
shader_program->set_vertex_input("position", *gpuTriangle);
Result<Uniform> proj_uniform = shader_program->get_uniform_by_name("proj");
glm::mat4 proj = glm::perspective(glm::radians(75.0f), (float)window_width / (float)window_height, 0.2f, 1000.0f);
proj_uniform->set(proj);
Result<Uniform> triangle_color_uniform = shader_program->get_uniform_by_name("triangle_color");
triangle_color_uniform->set(vec3f{ 1.0f, 0.0f, 0.0f });
Result<Uniform> view_uniform = shader_program->get_uniform_by_name("view");
Result<Uniform> model_uniform = shader_program->get_uniform_by_name("model");
Userdata userdata;
userdata.cam_dist = 3.0f;
glm::vec3 character_pos(0.0f, 0.0f, userdata.cam_dist);
auto t_start = std::chrono::high_resolution_clock::now();
glfwSetWindowUserPointer(window, &userdata);
glfwSetScrollCallback(window, [](GLFWwindow *window, double xoffset, double yoffset){
Userdata *userdata = (Userdata*)glfwGetWindowUserPointer(window);
userdata->cam_dist += yoffset;
});
//glEnable(GL_CULL_FACE);
while(!glfwWindowShouldClose(window)) {
glfwPollEvents();
if(glfwGetKey(window, GLFW_KEY_ESCAPE) == GLFW_PRESS)
glfwSetWindowShouldClose(window, GL_TRUE);
auto t_now = std::chrono::high_resolution_clock::now();
float time_delta = std::chrono::duration_cast<std::chrono::duration<float>>(t_now - t_start).count();
t_start = t_now;
float move_speed = time_delta * 3.0f;
if(glfwGetKey(window, GLFW_KEY_W))
character_pos.y -= move_speed;
if(glfwGetKey(window, GLFW_KEY_S))
character_pos.y += move_speed;
if(glfwGetKey(window, GLFW_KEY_A))
character_pos.x += move_speed;
if(glfwGetKey(window, GLFW_KEY_D))
character_pos.x -= move_speed;
character_pos.z = userdata.cam_dist;
glm::mat4 view = glm::lookAt(
character_pos,
character_pos - glm::vec3(0.0f, 3.0f, 3.0f),
glm::vec3(0.0f, 0.0f, 1.0f)
);
view_uniform->set(view);
glm::mat4 model = glm::mat4(1.0f);
model = glm::rotate(
model,
0.0f,
glm::vec3(0.0f, 0.0f, 1.0f)
);
model_uniform->set(model);
// Set color for clearing
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
// Do the actual screen clearing, using the color set using glClearColor
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
frame.draw(shader_program.get());
glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
glfwSwapBuffers(window);
}
glfwTerminate();
return 0;
}
void glfwErrorHandler(int errorCode, const char *errorDescription)
{
printf("GLFW error code: %d, description: %s\n", errorCode, errorDescription);
}
void initGlfw()
{
if(!glfwInit())
{
fprintf(stderr, "Failed to initialize GLFW\n");
exit(-1);
}
glfwWindowHint(GLFW_SAMPLES, 4); // anti aliasing
glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 4);
glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 5);
glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
glfwWindowHint(GLFW_RESIZABLE, GL_FALSE);
}
void initGlew() {
glewExperimental = true;
if(glewInit() != GLEW_OK) {
fprintf(stderr, "Failed to initialize GLEW\n");
glfwTerminate();
exit(-1);
}
}
static void error_callback(int error, const char *description) {
fprintf(stderr, "Opengl error: %s (%d)\n", description, error);
}
GLFWwindow* createWindow() {
glfwSetErrorCallback(error_callback);
GLFWwindow *window = glfwCreateWindow(1280, 720, "Amalgine", nullptr, nullptr);
if(!window)
{
fprintf(stderr, "Failed to open GLFW window\n");
glfwTerminate();
exit(10);
}
glfwSetInputMode(window, GLFW_STICKY_KEYS, GL_FALSE);
glfwMakeContextCurrent(window);
glfwSwapInterval(1); // 1 = enable vsync
initGlew();
return window;
}
static int file_read_all(const char *filepath, std::string &result) {
FILE *file = fopen(filepath, "rb");
if(!file) {
perror("file_read_all");
return errno;
}
fseek(file, 0, SEEK_END);
size_t file_size = ftell(file);
fseek(file, 0, SEEK_SET);
result.resize(file_size);
fread(&result[0], 1, result.size(), file);
fclose(file);
return 0;
}
std::unique_ptr<Shader> load_shader_from_file(const char *filepath, Shader::Type shader_type) {
std::string file_content;
if(file_read_all(filepath, file_content) != 0)
exit(13);
Result<std::unique_ptr<Shader>> vertex_shader_result = Shader::compile(shader_type, file_content.data(), file_content.size());
if(!vertex_shader_result) {
fprintf(stderr, "Failed to compile shader, error: %s\n", vertex_shader_result.getErrorMsg().c_str());
exit(12);
}
return std::move(vertex_shader_result.unwrap());
}
std::unique_ptr<ShaderProgram> build_shader_program_from_shaders(const std::vector<Shader*> &shaders) {
Result<std::unique_ptr<ShaderProgram>> shader_program_result = ShaderProgram::build(shaders);
if(!shader_program_result) {
fprintf(stderr, "Failed to link shaders, error: %s\n", shader_program_result.getErrorMsg().c_str());
exit(13);
}
return std::move(shader_program_result.unwrap());
}
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