#include <stdio.h>
#include <stdlib.h>
#include <iostream>
-#include <fstream>
-#include <sstream>
#include <array>
#include <vector>
#ifdef __APPLE__
#include <OpenGL/glew.h>
#endif
#include <GLUT/glut.h>
+#include "shapes.hpp"
#include <glm/glm.hpp>
#include <glm/ext.hpp>
#include <glm/gtc/type_ptr.hpp>
+#include <assimp/Importer.hpp>
+#include <assimp/scene.h>
+#include <assimp/postprocess.h>
+#include "model.hpp"
+#include "program.hpp"
+#include "skybox.hpp"
+#include "image.hpp"
+#include "util.hpp"
#pragma clang diagnostic ignored "-Wdeprecated-declarations"
using namespace std;
-GLuint* vaos;
-GLuint progId;
-glm::vec3 camPos = glm::vec3(0.0f, 0.0f, -5.0f);
-glm::vec3 camFront = glm::vec3(0.0f, 0.0f, 1.0f);
-glm::vec3 camUp = glm::vec3(0.0f, 1.0f, 0.0f);
-float yaw = 1.57, pitch = 0;
-bool doScale, doRotate, doTranslate;
+GLuint lightVao;
-void display() {
- glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
- glUseProgram(progId);
- glBindVertexArray(vaos[0]);
+Program *textureProg, *plainProg, *reflectProg, *pbrProg;
- float d = (float)glutGet(GLUT_ELAPSED_TIME) * 0.001f;
+std::vector<Skybox> skyboxes;
+int activeSkybox = 0;
- GLuint projId = glGetUniformLocation(progId, "projection");
- glm::mat4 proj = glm::perspective(glm::radians(45.f), 1.33f, 0.01f, 10000.f);
- glUniformMatrix4fv(projId, 1, GL_FALSE, glm::value_ptr(proj));
+Assimp::Importer importer; // Need to keep this around, otherwise stuff disappears!
+Model *sceneModel;
- GLuint viewId = glGetUniformLocation(progId, "view");
- glm::mat4 view = glm::lookAt(camPos, camPos + camFront, camUp);
- glUniformMatrix4fv(viewId, 1, GL_FALSE, glm::value_ptr(view));
+glm::vec3 camPos = {0, 0, -5}, camFront = {0, 0, 1}, camUp = {0, 1, 0};
+float fov = glm::radians(30.f), znear = 0.01f, zfar = 10000.f;
+float yaw = 1.57, pitch = 0;
- GLuint lightPosLoc = glGetUniformLocation(progId, "lightPos");
- glm::vec3 lightPos = glm::vec3(sin(d) * 10, 0, 0);//10 * cos(d));
- glUniform3fv(lightPosLoc, 1, glm::value_ptr(lightPos));
+struct Light {
+ glm::mat4 trans;
+ glm::vec3 color;
+};
- GLuint viewPosLoc = glGetUniformLocation(progId, "viewPos");
- glUniform3fv(viewPosLoc, 1, glm::value_ptr(camPos));
+std::vector<Light> lights;
- GLuint modelId = glGetUniformLocation(progId, "model");
+bool discoLights = false;
- for (int i = 0; i < 10; i++) {
+int windowWidth = 800, windowHeight = 600;
- glm::mat4 model = glm::mat4(1.f);
+float aspect() {
+ return (float)windowWidth / (float)windowHeight;
+}
- model = glm::translate(model, glm::vec3(sin(i * 30) * 10, 0, i * 2 - 10));
+glm::mat4 projMat() {
+ return glm::perspective(fov, aspect(), znear, zfar);
+}
- if (doRotate) {
- model = glm::rotate(model, d * glm::radians(30.f), glm::vec3(0.f, 1.f, 0.f));
- model = glm::rotate(model, d * glm::radians(20.f), glm::vec3(1.f, 0.f, 0.f));
+glm::mat4 viewMat() {
+ return glm::lookAt(camPos, camPos + camFront, camUp);
}
- if (doScale)
- model = glm::scale(model, glm::vec3(1.f, 0.7f + 0.7f * (1 + sin(d + (i + 3))), 1.f));
+void setProjectionAndViewUniforms(GLuint progId) {
+ GLuint projLoc = glGetUniformLocation(progId, "projection");
+ glm::mat4 proj = projMat();
+ glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(proj));
- if (doTranslate)
- model = glm::translate(model, glm::vec3(sin(d + (i + 1)), cos(d + (i + -3)), sin(d + (i + 4))));
+ GLuint viewLoc = glGetUniformLocation(progId, "view");
+ glm::mat4 view = viewMat();
+ glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
+ GLuint camPosLoc = glGetUniformLocation(progId, "camPos");
+ glUniform3fv(camPosLoc, 1, glm::value_ptr(camPos));
+}
- glUniformMatrix4fv(modelId, 1, GL_FALSE, glm::value_ptr(model));
+void setLightColorAndPos(GLuint progId, glm::vec3 lightPos, glm::vec4 lightColor) {
+ GLuint lightColorLoc = glGetUniformLocation(progId, "lightColor");
+ glUniform4fv(lightColorLoc, 1, glm::value_ptr(lightColor));
- glDrawArrays(GL_TRIANGLES, 0, 12);
- }
- glutSwapBuffers();
+ GLuint lightPosLoc = glGetUniformLocation(progId, "vLightPos");
+ glUniform3fv(lightPosLoc, 1, glm::value_ptr(lightPos));
+
+ GLuint viewPosLoc = glGetUniformLocation(progId, "vViewPos");
+ glUniform3fv(viewPosLoc, 1, glm::value_ptr(camPos));
}
-void attachShader(GLuint progId, const char* filePath, GLenum type) {
- GLuint shader = glCreateShader(type);
+void drawLight(Light &light) {
+ glUseProgram(plainProg->progId);
+ glBindVertexArray(lightVao);
+ setProjectionAndViewUniforms(plainProg->progId);
+ glm::mat4 model = glm::scale(light.trans, glm::vec3(0.2));
+ GLuint modelLoc = glGetUniformLocation(plainProg->progId, "model");
+ glUniformMatrix4fv(modelLoc, 1, GL_FALSE, glm::value_ptr(model));
- if (!shader) {
- fprintf(stderr, "error creating shader\n");
- exit(1);
- }
+ GLuint colorLoc = glGetUniformLocation(plainProg->progId, "color");
+ glUniform4fv(colorLoc, 1, glm::value_ptr(light.color));
- ifstream file(filePath);
- stringstream buffer;
- buffer << file.rdbuf();
- string str = buffer.str();
- const char* contents = str.c_str();
-
- glShaderSource(shader, 1, (const GLchar**)&contents, NULL);
- glCompileShader(shader);
- GLint success;
- glGetShaderiv(shader, GL_COMPILE_STATUS, &success);
- if (!success) {
- GLchar log[1024];
- glGetShaderInfoLog(shader, 1024, NULL, log);
- fprintf(stderr, "error: %s\n", log);
- exit(1);
- }
- glAttachShader(progId, shader);
+ glDrawArrays(GL_TRIANGLES, 0, 36);
}
-GLuint compileShaders(char* vertexShader, char* fragmentShader) {
- GLuint progId = glCreateProgram();
- attachShader(progId, vertexShader, GL_VERTEX_SHADER);
- attachShader(progId, fragmentShader, GL_FRAGMENT_SHADER);
+void display() {
+ glClearColor(0.5, 0.5, 0.5, 1);
+ glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
+ glViewport(0, 0, windowWidth * 2, windowHeight * 2);
- glLinkProgram(progId);
- GLint success = 0;
- glGetProgramiv(progId, GL_LINK_STATUS, &success);
- if (!success) {
- GLchar log[1024];
- glGetProgramInfoLog(progId, sizeof(log), NULL, log);
- fprintf(stderr, "error linking: %s\n", log);
- exit(1);
+ float d = (float)glutGet(GLUT_ELAPSED_TIME) * 0.001f;
+
+ glUseProgram(getUtilProg()->progId);
+ setProjectionAndViewUniforms(getUtilProg()->progId);
+
+ glUseProgram(pbrProg->progId);
+ setProjectionAndViewUniforms(pbrProg->progId);
+
+ size_t numLights = lights.size() + (discoLights ? 3 : 0);
+ glm::vec3 lightPositions[numLights], lightColors[numLights];
+ for (int i = 0; i < lights.size(); i++) {
+ lightPositions[i] = glm::vec3(lights[i].trans[3]);
+ lightColors[i] = lights[i].color;
}
- return progId;
+ if (discoLights) {
+ for (int i = numLights - 3; i < numLights; i++) {
+ auto m = glm::translate(glm::mat4(1.f), glm::vec3(-2.5, 0, 0));
+ m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(1, 0, 0));
+ m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(0, 1, 0));
+ m = glm::rotate(m, glm::radians(d * 100 + i * 30), glm::vec3(0, 0, 1));
+ lightPositions[i] = glm::vec3(m * glm::vec4(5, 0, 0, 1));
+ lightColors[i] = glm::vec3(0.2);
+ if (i % 3 == 0) lightColors[i].x = sin(d);
+ if (i % 3 == 1) lightColors[i].y = cos(d * 3);
+ if (i % 3 == 2) lightColors[i].z = cos(d);
+ }
}
-#define BUFFER_OFFSET(i) ((char *)NULL + (i))
+ glUniform1ui(glGetUniformLocation(pbrProg->progId, "numLights"), numLights);
+ glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightPositions"), numLights, glm::value_ptr(lightPositions[0]));
+ glUniform3fv(glGetUniformLocation(pbrProg->progId, "lightColors"), numLights, glm::value_ptr(lightColors[0]));
-GLuint setupBuffers(glm::vec3* vertices, glm::vec3* normals, GLuint progId) {
+ /* sceneModel->find("Top Bone")->transform = glm::rotate(glm::mat4(1), d / 5.f, { 1, 0, 0}); */
+ /* sceneModel->find("Bottom Bone")->transform = glm::rotate(glm::mat4(1), d / 3.f, { 1, 0, 0}); */
+ sceneModel->draw(skyboxes[activeSkybox], d * 1000);
- GLfloat colors[] = {
- 0, 1, 0, 1,
- 1, 0, 0, 1,
- 0, 0, 1, 1,
+ for (Light &light: lights) drawLight(light);
- 0, 1, 0, 1,
- 1, 0, 0, 1,
- 0, 0, 1, 1,
+ // TODO: restore
+ /* if (discoLights) { */
+ /* for (int i = numLights - 3; i < numLights; i++) { */
+ /* Light l = { lightPositions[i], lightColors[i] }; */
+ /* drawLight(l); */
+ /* } */
+ /* } */
- 0, 1, 0, 1,
- 1, 0, 0, 1,
- 0, 0, 1, 1,
+ skyboxes[activeSkybox].draw(projMat(), viewMat());
- 0, 1, 0, 1,
- 1, 0, 0, 1,
- 0, 0, 1, 1
- };
+ glutSwapBuffers();
+}
- GLuint numVerts = 12;
+void setupLightBuffers(GLuint progId) {
+ auto vertices = cube();
+ GLuint verticesSize = 36 * 3 * sizeof(GLfloat);
+ glGenVertexArrays(1, &lightVao);
GLuint vbo;
+ glBindVertexArray(lightVao);
glGenBuffers(1, &vbo);
-
- GLuint vao;
- glGenVertexArrays(1, &vao);
-
- GLuint posId = glGetAttribLocation(progId, "vPosition");
- GLuint colorId = glGetAttribLocation(progId, "vColor");
- GLuint normalLoc = glGetAttribLocation(progId, "vNormal");
-
- GLuint vertsLen = numVerts * 3 * sizeof(GLfloat);
- GLuint colorsLen = numVerts * 4 * sizeof(GLfloat);
- GLuint normalLen = numVerts * 3 * sizeof(GLfloat);
-
glBindBuffer(GL_ARRAY_BUFFER, vbo);
- glBufferData(GL_ARRAY_BUFFER, vertsLen + colorsLen + normalLen, NULL, GL_STATIC_DRAW);
+ glBufferData(GL_ARRAY_BUFFER, verticesSize, NULL, GL_STATIC_DRAW);
+ glBufferSubData(GL_ARRAY_BUFFER, 0, verticesSize, glm::value_ptr(vertices[0]));
+ GLuint posLoc = glGetAttribLocation(progId, "vPosition");
+ glEnableVertexAttribArray(posLoc);
+ glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
+}
- glBufferSubData(GL_ARRAY_BUFFER, 0, vertsLen, glm::value_ptr(vertices[0]));
- glBufferSubData(GL_ARRAY_BUFFER, vertsLen, colorsLen, colors);
- glBufferSubData(GL_ARRAY_BUFFER, vertsLen + colorsLen, normalLen, glm::value_ptr(normals[0]));
+int findNodeTrans(struct aiNode *n, const struct aiString name, glm::mat4 *dest) {
+ if (strcmp(n->mName.data, name.data) == 0) {
+ *dest = aiMatrixToMat4(n->mTransformation);
+ return 0;
+ }
+ for (int i = 0; i < n->mNumChildren; i++) {
+ if (findNodeTrans(n->mChildren[i], name, dest) == 0) {
+ glm::mat4 t = aiMatrixToMat4(n->mTransformation);
+ *dest = t * *dest;
+ return 0;
+ }
+ }
+ return 1;
+}
- glBindVertexArray(vao);
+void init() {
+ initUtilProg();
- glEnableVertexAttribArray(posId);
- glVertexAttribPointer(posId, 3, GL_FLOAT, GL_FALSE, 0, 0);
+ plainProg = new Program("plainvertex.glsl", "plainfrag.glsl");
+ glUseProgram(plainProg->progId);
+ setupLightBuffers(plainProg->progId);
+ plainProg->validate();
- glEnableVertexAttribArray(colorId);
- glVertexAttribPointer(colorId, 4, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(vertsLen));
+ skyboxes.push_back(Skybox(Image("skyboxes/loft/Newport_Loft_Ref.hdr")));
+ skyboxes.push_back(Skybox(Image("skyboxes/wooden_lounge_8k.hdr")));
+ skyboxes.push_back(Skybox(Image("skyboxes/machine_shop_02_8k.hdr")));
+ skyboxes.push_back(Skybox(Image("skyboxes/pink_sunrise_8k.hdr")));
- glEnableVertexAttribArray(normalLoc);
- glVertexAttribPointer(normalLoc, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(vertsLen + colorsLen));
+ pbrProg = new Program("pbrvert.glsl", "pbrfrag.glsl");
+ glUseProgram(pbrProg->progId);
- return vao;
+ const std::string scenePath = "models/newtonsCradle.glb";
+ const aiScene *scene = importer.ReadFile(scenePath, aiProcess_Triangulate | aiProcess_CalcTangentSpace | aiProcess_GenNormals | aiProcess_FlipUVs);
+ if (!scene) {
+ std::cerr << importer.GetErrorString() << std::endl;
+ exit(1);
}
-void validateProgram(GLuint progId) {
- glValidateProgram(progId);
+ if (scene->mNumCameras > 0) {
+ aiCamera *cam = scene->mCameras[0];
+ glm::mat4 camTrans;
+ if (findNodeTrans(scene->mRootNode, cam->mName, &camTrans) != 0)
+ abort(); // there must be a node with the same name as camera
- GLint success;
- glGetProgramiv(progId, GL_VALIDATE_STATUS, &success);
- if (!success) {
- GLchar log[1024];
- glGetProgramInfoLog(progId, sizeof(log), NULL, log);
- fprintf(stderr, "error: %s\n", log);
- exit(1);
- }
-}
+ camPos = { camTrans[3][0], camTrans[3][1], camTrans[3][2] };
-void init() {
- glm::vec3 vertices[12] = {
- glm::vec3(0.0f, 1.0f, 0.0f),
- glm::vec3(1.0f, -1.0f, -1.0f),
- glm::vec3(-1.0f, -1.0f, -1.0f),
-
- glm::vec3(0.0f, 1.0f, 0.0f),
- glm::vec3(-1.0f, -1.0f, 1.0f),
- glm::vec3(1.0f, -1.0f, 1.0f),
-
- glm::vec3(0.0f, 1.0f, 0.0f),
- glm::vec3(-1.0f, -1.0f, -1.0f),
- glm::vec3(-1.0f, -1.0f, 1.0f),
-
- glm::vec3(0.0f, 1.0f, 0.0f),
- glm::vec3(1.0f, -1.0f, 1.0f),
- glm::vec3(1.0f, -1.0f, -1.0f)
- };
+ glm::vec3 camLookAt = glm::vec3(cam->mLookAt.x, cam->mLookAt.y, cam->mLookAt.z);
+ camFront = camLookAt - camPos;
- // work out the normals
- glm::vec3 normals[12];
- for (int i = 0; i < 4; i++) {
- glm::vec3 a = vertices[i * 3];
- glm::vec3 b = vertices[i * 3 + 1];
- glm::vec3 c = vertices[i * 3 + 2];
- glm::vec3 u = glm::normalize(a - c);
- glm::vec3 v = glm::normalize(b - c);
- glm::vec3 norm = glm::normalize(glm::cross(v, u));
- for(int j = 0; j < 3; j++) {
- normals[i * 3 + j] = glm::vec3(norm);
- }
+ camUp = glm::vec3(cam->mUp.x, cam->mUp.y, cam->mUp.z);
+
+ fov = cam->mHorizontalFOV;
+ // TODO: aspectRatio = cam->mAspect;
+ znear = cam->mClipPlaneNear;
+ zfar = cam->mClipPlaneFar;
}
- vaos = new GLuint[2];
+ for (int i = 0; i < scene->mNumLights; i++) {
+ aiLight *light = scene->mLights[i];
+ glm::mat4 trans; findNodeTrans(scene->mRootNode, light->mName, &trans);
+ glm::vec3 col = { light->mColorAmbient.r, light->mColorAmbient.g, light->mColorAmbient.b };
+ Light l = { trans, col };
+ lights.push_back(l);
+ }
- progId = compileShaders((char*)"vertex.glsl", (char*)"fragment.glsl");
- glUseProgram(progId);
- vaos[0] = setupBuffers(vertices, normals, progId);
- validateProgram(progId);
+ sceneModel = new Model(scene, *pbrProg);
glEnable(GL_DEPTH_TEST);
glEnable(GL_CULL_FACE);
+ // prevent edge artifacts in specular cubemaps
+ glEnable(GL_TEXTURE_CUBE_MAP_SEAMLESS);
+
+ glViewport(0, 0, windowWidth, windowHeight);
}
-bool* keyStates = new bool[256];
+bool keyStates[256] = {false};
void keyboard(unsigned char key, int x, int y) {
keyStates[key] = true;
if (key == 'z')
- doScale = !doScale;
- if (key == 'x')
- doRotate = !doRotate;
+ activeSkybox = (activeSkybox + 1) % skyboxes.size();
if (key == 'c')
- doTranslate = !doTranslate;
+ discoLights = !discoLights;
}
void keyboardUp(unsigned char key, int x, int y) {
keyStates[key] = false;
}
+#define ENABLE_MOVEMENT
+
void timer(int _) {
+#ifdef ENABLE_MOVEMENT
float xSpeed = 0.f, ySpeed = 0.f, zSpeed = 0.f;
if (keyStates['w'])
zSpeed = 0.1f;
camPos.x += xSpeed * sin(yaw) + zSpeed * cos(yaw);
camPos.y += ySpeed;
camPos.z += zSpeed * sin(yaw) - xSpeed * cos(yaw);
+#endif
glutPostRedisplay();
glutTimerFunc(16, timer, 0);
}
bool firstMouse = true;
void motion(int x, int y) {
+#ifdef ENABLE_MOVEMENT
if (firstMouse) {
prevMouseX = x;
prevMouseY = y;
front.y = sin(pitch);
front.z = cos(pitch) * sin(yaw);
camFront = glm::normalize(front);
+
+ if (pitch < -1.57079632679 || pitch >= 1.57079632679) {
+ camUp = glm::vec3(0, -1, 0);
+ } else {
+ camUp = glm::vec3(0, 1, 0);
+ }
+#endif
}
void mouse(int button, int state, int x, int y) {
firstMouse = true;
}
+void reshape(int newWidth, int newHeight) {
+ windowWidth = newWidth, windowHeight = newHeight;
+}
+
int main(int argc, char** argv) {
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DEPTH|GLUT_DOUBLE|GLUT_RGB|GLUT_3_2_CORE_PROFILE);
- glutInitWindowSize(800, 600);
- int win = glutCreateWindow("Hello Triangle");
+ glutInitWindowSize(windowWidth, windowHeight);
+ glutCreateWindow("Physically Based Rendering");
glutDisplayFunc(display);
+ glutReshapeFunc(reshape);
glewInit();
projects / opengl.git / blobdiff