403 lines
13 KiB
C++
403 lines
13 KiB
C++
#include "platform_utils.h"
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#include <GL/glew.h>
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#include <GLFW/glfw3.h>
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#define GLM_ENABLE_EXPERIMENTAL
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#include <glm/glm.hpp>
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#include <glm/gtc/matrix_transform.hpp>
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#include <glm/gtx/transform.hpp>
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#include <glm/gtc/type_ptr.hpp>
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#include <imgui.h>
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#include <imgui_impl_glfw.h>
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#include <imgui_impl_opengl3.h>
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#include <iostream>
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#include <fstream>
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#include <sstream>
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#include <string>
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#include <vector>
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#include <cstdint>
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#include <algorithm>
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#include "scene.h"
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#include "camera.h"
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#include "Uniforms.h"
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#include "InitShader.h"
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#include "DebugCallback.h"
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namespace {
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const std::string kVertexShaderPath = "shaders/vertex.glsl";
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const std::string kTessellationCtrlPath = "shaders/tessellation_ctrl.glsl";
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const std::string kTessellationEvalPath = "shaders/tessellation_eval.glsl";
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const std::string kFragmentShaderPath = "shaders/fragment.glsl";
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const std::string kQuadVertexPath = "shaders/quad_vertex.glsl";
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const std::string kQuadFragmentPath = "shaders/quad_fragment.glsl";
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const std::string kHGTPath = "hgt/N02E016.hgt";
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GLuint tex_id = -1;
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float tessellationFactor = 32.0f;
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std::vector<Vertex> vertices;
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std::vector<GLuint> indices;
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} // namespace
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Scene::Scene(int width, int height)
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: window_width(width),
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window_height(height),
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shader_program_(-1),
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quad_shader_program_(-1),
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vao_(-1),
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quad_vao_(-1),
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angle_(-glm::pi<float>() / 2.0f),
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scale_(1.0f),
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aspect_(static_cast<float>(width) / static_cast<float>(height)),
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near_z_(0.1f),
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far_z_(10.0f),
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fov_(glm::pi<float>() / 6.0f)
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{}
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Scene::~Scene() {
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glDeleteProgram(shader_program_);
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glDeleteVertexArrays(1, &vao_);
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FBO::Cleanup(geo_fbo_);
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FBO::Cleanup(lht_fbo_);
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}
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void Scene::Init() {
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glewInit();
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glEnable(GL_DEPTH_TEST);
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glEnable(GL_CULL_FACE);
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geo_fbo_ = FBO::GenerateFramebuffer(window_width, window_height);
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lht_fbo_ = FBO::GenerateFramebuffer(window_width, window_height);
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std::vector<int16_t> heightData = LoadHGT(kHGTPath, 3601, 3601);
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tex_id = CreateHeightmapTexture(heightData, 3601, 3601);
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InitBuffers();
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ReloadShader();
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InitQuadBuffers();
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CameraControls::SetPosition(activeCamera_, glm::vec3(1.4f, 1.4f, 0.0f));
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CameraControls::SetRotation(activeCamera_, -glm::normalize(CameraControls::GetPosition(activeCamera_)));
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CameraControls::AdjustFocalLength(activeCamera_, 50.0f); // Temporary hardcode focal length
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CameraControls::AdjustSensorHeight(activeCamera_, 24.0f); // Temporary hardcode focal length
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CameraControls::AdjustNearPlane(activeCamera_, near_z_);
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CameraControls::AdjustFarPlane(activeCamera_, far_z_);
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UpdateCamera();
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Uniforms::Init();
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}
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void Scene::GenerateGrid(int divisions, std::vector<Vertex>& verts, std::vector<GLuint>& inds) {
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float step = 1.0f / static_cast<float>(divisions);
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float halfSize = 0.5f;
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// Create vertices for patches
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for (int i = 0; i <= divisions; i++) {
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for (int j = 0; j <= divisions; j++) {
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float x = -halfSize + j * step;
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float y = -halfSize + i * step;
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Vertex vertex;
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vertex.position = glm::vec3(x, y, 0.0f);
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vertex.texCoord = glm::vec2(static_cast<float>(j) / divisions, static_cast<float>(i) / divisions);
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verts.push_back(vertex);
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}
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}
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// Create indices for patches
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for (int i = 0; i < divisions; i++) {
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for (int j = 0; j < divisions; j++) {
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int bottomLeft = i * (divisions + 1) + j;
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int bottomRight = bottomLeft + 1;
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int topLeft = bottomLeft + (divisions + 1);
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int topRight = topLeft + 1;
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inds.push_back(topLeft);
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inds.push_back(topRight);
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inds.push_back(bottomRight);
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inds.push_back(bottomLeft);
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}
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}
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}
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// Currently creates a test triangle and initializes its buffers
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void Scene::InitBuffers() {
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int divisions = 16; // Number of divisions along one axis of the grid
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GenerateGrid(divisions, vertices, indices);
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// Create and bind VAO, VBO, and EBO, and pass the data to OpenGL
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GLuint vao, vbo, ebo;
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glGenVertexArrays(1, &vao_);
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glGenBuffers(1, &vbo);
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glGenBuffers(1, &ebo);
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glBindVertexArray(vao_);
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// Bind and fill the vertex buffer
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glBindBuffer(GL_ARRAY_BUFFER, vbo);
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glBufferData(GL_ARRAY_BUFFER, vertices.size() * sizeof(Vertex), vertices.data(), GL_STATIC_DRAW);
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// Bind and fill the element buffer
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(GLuint), indices.data(), GL_STATIC_DRAW);
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// Define vertex position attribute
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, position));
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glEnableVertexAttribArray(0);
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// Define texture coordinate attribute
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex), (void*)offsetof(Vertex, texCoord));
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glEnableVertexAttribArray(1);
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// Unbind VAO
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glBindVertexArray(0);
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}
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void Scene::InitQuadBuffers() {
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GLuint quad_vbo;
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// Full-screen quad vertices (position and texture coordinates)
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float quadVertices[] = {
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// positions // texCoords
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-1.0f, 1.0f, 0.0f, 1.0f, // Top-left
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-1.0f, -1.0f, 0.0f, 0.0f, // Bottom-left
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1.0f, 1.0f, 1.0f, 1.0f, // Top-right
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1.0f, -1.0f, 1.0f, 0.0f // Bottom-right
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};
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glGenVertexArrays(1, &quad_vao_);
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glGenBuffers(1, &quad_vbo);
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glBindVertexArray(quad_vao_);
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glBindBuffer(GL_ARRAY_BUFFER, quad_vbo);
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glBufferData(GL_ARRAY_BUFFER, sizeof(quadVertices), &quadVertices, GL_STATIC_DRAW);
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glEnableVertexAttribArray(0);
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glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(1);
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 4 * sizeof(float), (void*)(2 * sizeof(float)));
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glBindVertexArray(0);
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}
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// Allows for runtime shader updates
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void Scene::ReloadShader() {
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GLuint geo_shader = InitShader(kVertexShaderPath.c_str(), kTessellationCtrlPath.c_str(), kTessellationEvalPath.c_str(), kFragmentShaderPath.c_str());
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GLuint lht_shader = InitShader(kQuadVertexPath.c_str(), kQuadFragmentPath.c_str());
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if (geo_shader == -1 || lht_shader == -1) {
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DEBUG_BREAK();
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glClearColor(1.0f, 0.0f, 1.0f, 0.0f);
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} else {
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glClearColor(0.35f, 0.35f, 0.35f, 0.0f);
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if (shader_program_ != -1 && quad_shader_program_ != -1) {
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glDeleteProgram(shader_program_);
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glDeleteProgram(quad_shader_program_);
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}
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shader_program_ = geo_shader;
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quad_shader_program_ = lht_shader;
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}
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}
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void Scene::Display(GLFWwindow* window) {
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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FBO::Bind(geo_fbo_);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glUseProgram(shader_program_);
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//glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
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Uniforms::SceneData.PV = projection_matrix_ * CameraControls::GetViewMatrix(activeCamera_); // Projection-View matrix
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Uniforms::BufferSceneData();
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glm::mat4 model_matrix = glm::rotate(angle_, glm::vec3(1.0f, 0.0f, 0.0f)) * glm::scale(glm::vec3(scale_));
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glUniformMatrix4fv(Uniforms::UniformLocs::M, 1, false, glm::value_ptr(model_matrix));
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, tex_id);
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GLint heightTextureLoc = glGetUniformLocation(shader_program_, "heightTexture");
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glUniform1i(heightTextureLoc, 0);
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GLint tessFactorLoc = glGetUniformLocation(shader_program_, "tessellationFactor");
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glUniform1f(tessFactorLoc, tessellationFactor);
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glBindVertexArray(vao_);
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glPatchParameteri(GL_PATCH_VERTICES, 4);
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glDrawElements(GL_PATCHES, indices.size(), GL_UNSIGNED_INT, 0);
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//glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
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FBO::Bind(lht_fbo_);
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glUseProgram(quad_shader_program_);
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glActiveTexture(GL_TEXTURE0);
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glBindTexture(GL_TEXTURE_2D, geo_fbo_.albedoTexture);
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glActiveTexture(GL_TEXTURE1);
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glBindTexture(GL_TEXTURE_2D, geo_fbo_.positionTexture);
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glActiveTexture(GL_TEXTURE2);
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glBindTexture(GL_TEXTURE_2D, geo_fbo_.normalTexture);
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GLint colorTextureLoc = glGetUniformLocation(quad_shader_program_, "albedoGbuffer");
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glUniform1i(colorTextureLoc, 0);
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GLint positionTextureLoc = glGetUniformLocation(quad_shader_program_, "positionGbuffer");
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glUniform1i(positionTextureLoc, 1);
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GLint normalTextureLoc = glGetUniformLocation(quad_shader_program_, "normalGbuffer");
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glUniform1i(normalTextureLoc, 2);
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// Render the full-screen quad
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glBindVertexArray(quad_vao_);
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glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
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FBO::Unbind();
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DrawGui(window);
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glfwSwapBuffers(window);
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}
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void Scene::DrawGui(GLFWwindow* window) {
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// Begin ImGui frame
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ImGui_ImplOpenGL3_NewFrame();
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ImGui_ImplGlfw_NewFrame();
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// Enable docking
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ImGuiIO& io = ImGui::GetIO();
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io.ConfigFlags |= ImGuiConfigFlags_DockingEnable;
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ImGui::NewFrame();
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static ImGuiDockNodeFlags dockspace_flags = ImGuiDockNodeFlags_PassthruCentralNode;
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// Add menu bar
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ImGuiWindowFlags window_flags = ImGuiWindowFlags_MenuBar | ImGuiWindowFlags_NoDocking;
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// Style windows
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const ImGuiViewport* viewport = ImGui::GetMainViewport();
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ImGui::SetNextWindowPos(viewport->WorkPos);
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ImGui::SetNextWindowSize(viewport->WorkSize);
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ImGui::SetNextWindowViewport(viewport->ID);
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ImGui::PushStyleVar(ImGuiStyleVar_WindowRounding, 0.0f);
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ImGui::PushStyleVar(ImGuiStyleVar_WindowBorderSize, 0.0f);
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window_flags |= ImGuiWindowFlags_NoTitleBar | ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove;
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window_flags |= ImGuiWindowFlags_NoBringToFrontOnFocus | ImGuiWindowFlags_NoNavFocus;
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window_flags |= ImGuiWindowFlags_NoBackground;
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ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(0.0f, 0.0f));
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ImGui::Begin("TerraVisor", nullptr, window_flags);
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ImGui::PopStyleVar(3);
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// Submit the DockSpace
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if (io.ConfigFlags & ImGuiConfigFlags_DockingEnable) {
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ImGuiID dockspace_id = ImGui::GetID("MyDockSpace");
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ImGui::DockSpace(dockspace_id, ImVec2(0.0f, 0.0f), dockspace_flags);
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}
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if (ImGui::BeginMenuBar()) {
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if (ImGui::BeginMenu("Options")) {
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ImGui::Text("Nothing Here Yet, Check Back Later!");
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ImGui::EndMenu();
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}
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ImGui::EndMenuBar();
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}
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ImGui::End();
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// Draw Gui
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ImGui::Begin("Terrain Controls");
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if (ImGui::Button("Quit")) {
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glfwSetWindowShouldClose(window, GLFW_TRUE);
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}
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ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
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ImGui::SliderFloat("Tessellation Level", &tessellationFactor, 1.0f, 64.0f);
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ImGui::End();
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// Draw FBO to ImGui window
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ImGui::Begin("Scene Window");
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ImVec2 windowSize = ImGui::GetContentRegionAvail();
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ImGui::Image((void*)(intptr_t)lht_fbo_.albedoTexture, windowSize, ImVec2(0, 1), ImVec2(1, 0));
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ImGui::End();
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ImGui::Render();
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ImGui_ImplOpenGL3_RenderDrawData(ImGui::GetDrawData());
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}
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void Scene::Idle() {
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}
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int16_t Scene::SwapEndian(int16_t val) {
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return (val << 8) | ((val >> 8) & 0xFF);
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}
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std::vector<int16_t> Scene::LoadHGT(const std::string& filename, int width, int height) {
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std::ifstream file(filename, std::ios::binary);
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std::vector<int16_t> elevationData;
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if (file) {
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for (int i = 0; i < width * height; ++i) {
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int16_t value;
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file.read(reinterpret_cast<char*>(&value), sizeof(int16_t));
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// Handle endianness
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value = SwapEndian(value);
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if (value == -32768) {
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value = -32767; // Clamp no-data values
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}
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elevationData.push_back(value);
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}
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} else {
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std::cerr << "Failed to open HGT file!" << std::endl;
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}
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return elevationData;
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}
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void Scene::UpdateCamera() {
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projection_matrix_ = glm::perspective(CameraControls::GetFOV(activeCamera_), aspect_, activeCamera_.nearPlane, activeCamera_.farPlane);
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}
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GLuint Scene::CreateHeightmapTexture(std::vector<int16_t> data, int width, int height) {
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int16_t minVal = *std::min_element(data.begin(), data.end());
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int16_t maxVal = *std::max_element(data.begin(), data.end());
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std::vector<float> floatData;
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for (int16_t &d : data) {
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// Normalize the value between 0 and 1 based on the min/max range
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d = static_cast<int16_t>(255 * (d - minVal) / (maxVal - minVal));
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floatData.push_back(static_cast<float>(d / 255.0f));
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}
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GLuint textureID;
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glGenTextures(1, &textureID);
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glBindTexture(GL_TEXTURE_2D, textureID);
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glTexImage2D(GL_TEXTURE_2D, 0, GL_R32F, width, height, 0, GL_RED, GL_FLOAT, floatData.data());
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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glBindTexture(GL_TEXTURE_2D, 0);
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return textureID;
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} |