X-Git-Url: http://git.lukelau.me/?p=opengl.git;a=blobdiff_plain;f=main.cpp;h=281da276905660e1e4a5935c1caf961f9c53d97f;hp=f7b2f85a4644f12ba6df69a5f02363926686afe7;hb=5e2b8438a1600a790dc105d25b7d5cd2278864aa;hpb=ba9c738e8660304aa0341eb44118e63502a4a009

diff --git a/main.cpp b/main.cpp
index f7b2f85..281da27 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,8 +1,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <iostream>
-#include <fstream>
-#include <sstream>
 #include <array>
 #include <vector>
 #ifdef __APPLE__
@@ -11,37 +9,71 @@
 #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 "teapot.h"
+#include "program.hpp"
+#include "skybox.hpp"
+#include "image.hpp"
+#include "util.hpp"
 
 #pragma clang diagnostic ignored "-Wdeprecated-declarations"
 
 using namespace std;
 
-GLuint pyramidVao, lightVao, teapotVao;
-GLuint gradientProgId, plainProgId, normalProgId, solidProgId, textureProgId;
-glm::vec3 camPos   = glm::vec3(0.0f, 0.0f,  0.0f);
-glm::vec3 camFront = glm::vec3(0.0f, 0.0f, 1.0f);
-glm::vec3 camUp    = glm::vec3(0.0f, 1.0f,  0.0f);
+GLuint lightVao;
+
+Program *textureProg, *plainProg, *reflectProg, *pbrProg;
+
+std::vector<Skybox> skyboxes;
+int activeSkybox = 0;
+
+Assimp::Importer importer; // Need to keep this around, otherwise stuff disappears!
+Model *sceneModel;
+
+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;
-bool doScale, doRotate, doTranslate;
-Model *monkeyHead, *chest;
-glm::vec3 chestPos(0);
 
-const int WIDTH = 800, HEIGHT = 600;
-const float ASPECT = (float)WIDTH / (float)HEIGHT;
+struct Light {
+	glm::mat4 trans;
+	glm::vec3 color;
+};
+
+std::vector<Light> lights;
+
+bool discoLights = false;
+
+int windowWidth = 800, windowHeight = 600;
+
+float aspect() {
+	return (float)windowWidth / (float)windowHeight;
+}	
+
+glm::mat4 projMat() {
+	return glm::perspective(fov, aspect(), znear, zfar);
+}
+
+glm::mat4 viewMat() {
+	return glm::lookAt(camPos, camPos + camFront, camUp);
+}
 
 void setProjectionAndViewUniforms(GLuint progId) {
 	GLuint projLoc = glGetUniformLocation(progId, "projection");
-	glm::mat4 proj = glm::perspective(glm::radians(45.f), ASPECT, 0.01f, 10000.f);
+	glm::mat4 proj = projMat();
 	glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(proj));
 
 	GLuint viewLoc = glGetUniformLocation(progId, "view");
-	glm::mat4 view = glm::lookAt(camPos, camPos + camFront, camUp);
+	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));
 }
 
 void setLightColorAndPos(GLuint progId, glm::vec3 lightPos, glm::vec4 lightColor) {
@@ -55,323 +87,80 @@ void setLightColorAndPos(GLuint progId, glm::vec3 lightPos, glm::vec4 lightColor
 	glUniform3fv(viewPosLoc, 1, glm::value_ptr(camPos));
 }
 
-void drawLight(float d, glm::vec3 lightPos, glm::vec4 lightColor) {
-  	glUseProgram(plainProgId);
+void drawLight(Light &light) {
+  	glUseProgram(plainProg->progId);
 	glBindVertexArray(lightVao);
-	setProjectionAndViewUniforms(plainProgId);
-	glm::mat4 model = glm::translate(glm::mat4(1.f), lightPos);
-	model = glm::scale(model, glm::vec3(0.2));
-	GLuint modelLoc = glGetUniformLocation(plainProgId, "model");
+	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));
 
-	GLuint colorLoc = glGetUniformLocation(plainProgId, "color");
-	glm::vec4 color(lightColor);
-	glUniform4fv(colorLoc, 1, glm::value_ptr(color));
+	GLuint colorLoc = glGetUniformLocation(plainProg->progId, "color");
+	glUniform4fv(colorLoc, 1, glm::value_ptr(light.color));
 		
 	glDrawArrays(GL_TRIANGLES, 0, 36);
-};
-
-void drawPyramids(float d, glm::vec3 lightPos, glm::vec4 lightColor) {
-	glUseProgram(gradientProgId);
-	glBindVertexArray(pyramidVao);
-	setProjectionAndViewUniforms(gradientProgId);
-
-	setLightColorAndPos(gradientProgId, lightPos, lightColor);
-
-	GLuint modelId = glGetUniformLocation(gradientProgId, "model");
-
-	for (int i = 0; i < 10; i++) {
-
-		glm::mat4 model = glm::mat4(1.f);
-
-		model = glm::translate(model, glm::vec3(sin(i * 30) * 10, 0, i * 2 - 10));
-		
-		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));
 }
 
-		if (doScale)
-			model = glm::scale(model, glm::vec3(1.f, 0.7f + 0.7f * (1 + sin(d + (i + 3))), 1.f));
-
-		if (doTranslate)
-			model = glm::translate(model, glm::vec3(sin(d + (i + 1)), cos(d + (i + -3)), sin(d + (i + 4))));
-	
-
-		glUniformMatrix4fv(modelId, 1, GL_FALSE, glm::value_ptr(model));
-		
-		glDrawArrays(GL_TRIANGLES, 0, 18);
-	}
-
-};
-
-enum TeapotProjection { teapotOrtho, teapotCamera, teapotPerspStatic, teapotPerspAnimated };
-
-void drawTeapot(TeapotProjection proj, bool rotate, float d, glm::vec3 lightPos, glm::vec4 lightColor) {
-	glUseProgram(normalProgId);
-	
-	GLuint projLoc = glGetUniformLocation(normalProgId, "projection");
-	GLuint viewLoc = glGetUniformLocation(normalProgId, "view");
-	switch (proj) {
-	case teapotCamera:
-		setProjectionAndViewUniforms(normalProgId);
-		break;
-	case teapotOrtho:
-		{
-			glm::mat4 proj = glm::ortho(-5.f * ASPECT, 5.f * ASPECT, -5.f, 5.f, 0.01f, 1000.f);
-			glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(proj));
-
-			glm::vec3 camPos(-5, 5, -5), camFront = glm::vec3(0) - camPos;
-			glm::mat4 view = glm::lookAt(camPos, camPos + camFront, camUp);
-			glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
-		}
-		break;
-	case teapotPerspStatic:
-	case teapotPerspAnimated:
-		{
-			float fov = glm::radians(45.f);
-			if (proj == teapotPerspAnimated)
-				fov += glm::radians(sin(d) * 30.f);
-			glm::mat4 proj = glm::perspective(fov, ASPECT, 0.01f, 10000.f);
-			glUniformMatrix4fv(projLoc, 1, GL_FALSE, glm::value_ptr(proj));
-
-			glm::mat4 view = glm::lookAt(glm::vec3(0, 0, -10), glm::vec3(0), camUp);
-			glUniformMatrix4fv(viewLoc, 1, GL_FALSE, glm::value_ptr(view));
-		}
-		break;
-	}
-	setLightColorAndPos(normalProgId, lightPos, lightColor);
-	glBindVertexArray(teapotVao);
-	GLuint modelId = glGetUniformLocation(normalProgId, "model");
-	glm::mat4 model(1);
-	model = glm::scale(model, glm::vec3(0.3));
-	if (rotate) model = glm::rotate(model, d, glm::vec3(0, 1, 0));
-	glUniformMatrix4fv(modelId, 1, GL_FALSE, glm::value_ptr(model));
-
-	glDrawArrays(GL_TRIANGLES, 0, teapot_vertex_count);
-}
 
 void display() {
 	glClearColor(0.5, 0.5, 0.5, 1);
 	glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
-	float d = (float)glutGet(GLUT_ELAPSED_TIME) * 0.001f;
-
-	/* glm::vec3 lightPos = glm::vec3(sin(d / 10.f) * 10, 0, cos(d / 10.f) * 10); */
-	glm::vec3 lightPos = chestPos;
-	glm::vec4 lightColor(1, 1, 1, 1);
+	glViewport(0, 0, windowWidth * 2, windowHeight * 2);
 
-	drawLight(d, lightPos, lightColor);
-
-	glUseProgram(textureProgId);
-	setProjectionAndViewUniforms(textureProgId);
-	setLightColorAndPos(textureProgId, lightPos, lightColor);
-
-	Model::Node *top = chest->find("top");
-	top->model = glm::translate(glm::mat4(1), glm::vec3(0, 1, -1));
-	top->model = glm::rotate(top->model, sin(d / 2.5f) * 0.5f, glm::vec3(1, 0, 0));
-	top->model = glm::translate(top->model, glm::vec3(0, -1, 1));
-	
-	/* Model::Node *jewels = chest->find("jewels"); */
-	/* jewels->model = glm::scale(glm::mat4(1), glm::vec3((sin(d) + 1.2f) / 2.f)); */
-
-	/* Model::Node *lock = chest->find("lock"); */
-	/* lock->model = glm::translate(glm::mat4(1), glm::vec3(0.22610, 3.36478, -0.75649)); */
-	/* lock->model = glm::rotate(lock->model, (d / 2.5f), glm::vec3(0, 1, 0.4)); */
-	/* lock->model = glm::translate(lock->model, -glm::vec3(0.22610, 3.36478, -0.75649)); */
-
-	/* Model::Node *key = chest->find("key"); */
-	/* key->model = glm::translate(glm::mat4(1), glm::vec3(0, 0, sin(d))); */
-	
-	/* chest->getRoot()->model = glm::translate(glm::mat4(1), chestPos); */
-	chest->draw();
-
-	glutSwapBuffers();
-}
+	float d = (float)glutGet(GLUT_ELAPSED_TIME) * 0.001f;
 
-void attachShader(GLuint progId, const char* filePath, GLenum type) {
-	GLuint shader = glCreateShader(type);
+	glUseProgram(getUtilProg()->progId);
+	setProjectionAndViewUniforms(getUtilProg()->progId);
 
-	if (!shader) {
-		fprintf(stderr, "error creating shader\n");
-		exit(1);
-	}
+	glUseProgram(pbrProg->progId);
+	setProjectionAndViewUniforms(pbrProg->progId);
 
-	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);
+	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;
 	}
 
-GLuint compileShaders(char* vertexShader, char* fragmentShader) {
-	GLuint progId = glCreateProgram();
-
-	attachShader(progId, vertexShader, GL_VERTEX_SHADER);
-	attachShader(progId, fragmentShader, GL_FRAGMENT_SHADER);
-
-	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);
+	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);
 		}
-
-	return progId;
 	}
 	
-#define BUFFER_OFFSET(i) ((char *)NULL + (i))
-
-GLuint setupBuffers(glm::vec3* vertices, glm::vec3* normals, GLuint progId) {
-
-	GLfloat colors[] = {
-		0, 1, 0, 1,
-		1, 0, 0, 1,
-		0, 0, 1, 1,
-
-		0, 1, 0, 1,
-		1, 0, 0, 1,
-		0, 0, 1, 1,
-
-		0, 1, 0, 1,
-		1, 0, 0, 1,
-		0, 0, 1, 1,
-
-		0, 1, 0, 1,
-		1, 0, 0, 1,
-		0, 0, 1, 1,
-
-		0, 1, 0, 1,
-		1, 0, 0, 1,
-		0, 0, 1, 1,
-		
-		0, 1, 0, 1,
-		1, 0, 0, 1,
-		0, 0, 1, 1
-	};
-
-	GLuint numVerts = 18;
-
-	GLuint vbo;
-	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);
+	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]));
 
-	glBindBuffer(GL_ARRAY_BUFFER, vbo);
-	glBufferData(GL_ARRAY_BUFFER, vertsLen + colorsLen + normalLen, NULL, GL_STATIC_DRAW);
-
-	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]));
+	/* 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);
 
-	glBindVertexArray(vao);
+	for (Light &light: lights) drawLight(light);
 
-	glEnableVertexAttribArray(posId);
-	glVertexAttribPointer(posId, 3, GL_FLOAT, GL_FALSE, 0, 0);
+	// TODO: restore
+	/* if (discoLights) { */
+	/* 	for (int i = numLights - 3; i < numLights; i++) { */
+	/* 		Light l = { lightPositions[i], lightColors[i] }; */
+	/* 		drawLight(l); */
+	/* 	} */
+	/* } */
 
-	glEnableVertexAttribArray(colorId);
-	glVertexAttribPointer(colorId, 4, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(vertsLen));
+	skyboxes[activeSkybox].draw(projMat(), viewMat());
 
-	glEnableVertexAttribArray(normalLoc);
-	glVertexAttribPointer(normalLoc, 3, GL_FLOAT, GL_FALSE, 0, BUFFER_OFFSET(vertsLen + colorsLen));
-
-	return vao;
-}
-
-vector<glm::vec3> quadToTriangles(glm::vec3 *quads) {
-	vector<glm::vec3> triangles(6);
-	triangles[0] = quads[0];
-	triangles[1] = quads[1];
-	triangles[2] = quads[2];
-	triangles[3] = quads[2];
-	triangles[4] = quads[3];
-	triangles[5] = quads[0];
-	return triangles;
+	glutSwapBuffers();
 }
 
-template <typename T>
-void append(vector<T> &a, vector<T> &b) {
-	a.insert(a.end(), b.begin(), b.end());
-};
-
 void setupLightBuffers(GLuint progId) {
-  	vector<glm::vec3> vertices;
-	glm::vec3 front[] = {
-		glm::vec3(1, -1, -1),
-		glm::vec3(-1, -1, -1),
-		glm::vec3(-1, 1, -1),
-		glm::vec3(1, 1, -1)
-	};
-	vector<glm::vec3> frontTriangles = quadToTriangles(front);
-	append(vertices, frontTriangles);
-
-	glm::vec3 back[] = {
-		glm::vec3(1, 1, 1),
-		glm::vec3(-1, 1, 1),
-		glm::vec3(-1, -1, 1),
-		glm::vec3(1, -1, 1)
-	};
-	vector<glm::vec3> backQuads = quadToTriangles(back);
-	append(vertices, backQuads);
-
-	glm::vec3 top[] = {
-		glm::vec3(1, 1, -1),
-		glm::vec3(-1, 1, -1),
-		glm::vec3(-1, 1, 1),
-		glm::vec3(1, 1, 1)
-	};
-	vector<glm::vec3> topTriangles = quadToTriangles(top);
-	append(vertices, topTriangles);
-
-	glm::vec3 bottom[] = {
-		glm::vec3(1, -1, 1),
-		glm::vec3(-1, -1, 1),
-		glm::vec3(-1, -1, -1),
-		glm::vec3(1, -1, -1)
-	};
-	vector<glm::vec3> bottomTriangles = quadToTriangles(bottom);
-	append(vertices, bottomTriangles);
-
-	glm::vec3 left[] = {
-		glm::vec3(-1, 1, 1),
-		glm::vec3(-1, 1, -1),
-		glm::vec3(-1, -1, -1),
-		glm::vec3(-1, -1, 1)
-	};
-	vector<glm::vec3> leftTriangles = quadToTriangles(left);
-	append(vertices, leftTriangles);
-
-	glm::vec3 right[] = {
-		glm::vec3(1, 1, -1),
-		glm::vec3(1, 1, 1),
-		glm::vec3(1, -1, 1),
-		glm::vec3(1, -1, -1)
-	};
-	vector<glm::vec3> rightTriangles = quadToTriangles(right);
-	append(vertices, rightTriangles);
+  	auto vertices = cube();
 	GLuint verticesSize = 36 * 3 * sizeof(GLfloat);
 
 	glGenVertexArrays(1, &lightVao);
@@ -386,129 +175,99 @@ void setupLightBuffers(GLuint progId) {
 	glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, 0);
 }
 
-void setupTeapotBuffers(GLuint progId) {
-	GLuint vbos[2];
-	glGenBuffers(2, vbos);
-	glBindBuffer(GL_ARRAY_BUFFER, vbos[0]);
-	glBufferData(GL_ARRAY_BUFFER, 3 * teapot_vertex_count * sizeof(float), teapot_vertex_points, GL_STATIC_DRAW);
-	glBindBuffer(GL_ARRAY_BUFFER, vbos[1]);
-	glBufferData(GL_ARRAY_BUFFER, 3 * teapot_vertex_count * sizeof(float), teapot_normals, GL_STATIC_DRAW);
-
-	glGenVertexArrays(1, &teapotVao);
-	glBindVertexArray(teapotVao);
+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;
+}
 
-	GLuint posLoc = glGetAttribLocation(progId, "vPosition");
-	GLuint normalLoc = glGetAttribLocation(progId, "vNormal");
+void init() {
+	initUtilProg();
 
-	glEnableVertexAttribArray(posLoc);
-	glBindBuffer(GL_ARRAY_BUFFER, vbos[0]);
-	glVertexAttribPointer(posLoc, 3, GL_FLOAT, GL_FALSE, 0, NULL);
+	plainProg = new Program("plainvertex.glsl", "plainfrag.glsl");
+	glUseProgram(plainProg->progId);
+	setupLightBuffers(plainProg->progId);
+	plainProg->validate();
 
-	glEnableVertexAttribArray(normalLoc);
-	glBindBuffer(GL_ARRAY_BUFFER, vbos[1]);
-	glVertexAttribPointer(normalLoc, 3, GL_FLOAT, GL_FALSE, 0, NULL);
-}
+	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")));
 
-void validateProgram(GLuint progId) {
-	glValidateProgram(progId);
+	pbrProg = new Program("pbrvert.glsl", "pbrfrag.glsl");
+	glUseProgram(pbrProg->progId);
 
-	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);
+	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 init() {
-	glm::vec3 vertices[18] = {
-		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(1, -1, 1),
-		glm::vec3(-1, -1, 1),
-		glm::vec3(-1, -1, -1),
-		glm::vec3(-1, -1, -1),
-		glm::vec3(1, -1, -1),
-		glm::vec3(1, -1, 1)
-	};
+	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
 
-	// work out the normals
-	glm::vec3 normals[18];
-	for (int i = 0; i < 6; 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);
-		}
-	}
+		camPos = { camTrans[3][0], camTrans[3][1], camTrans[3][2] };
 
-	gradientProgId = compileShaders((char*)"vertex.glsl", (char*)"gradientfrag.glsl");
-	glUseProgram(gradientProgId);
-	pyramidVao = setupBuffers(vertices, normals, gradientProgId);
-	validateProgram(gradientProgId);
+		glm::vec3 camLookAt = glm::vec3(cam->mLookAt.x, cam->mLookAt.y, cam->mLookAt.z);
+		camFront = camLookAt - camPos;
 
-	plainProgId = compileShaders((char*)"plainvertex.glsl", (char*)"plainfrag.glsl");
-	glUseProgram(plainProgId);
-	setupLightBuffers(plainProgId);
-	validateProgram(plainProgId);
+		camUp = glm::vec3(cam->mUp.x, cam->mUp.y, cam->mUp.z);
 		
-	normalProgId = compileShaders((char*)"vertex.glsl", (char*)"normalfrag.glsl");
-	glUseProgram(normalProgId);
-	setupTeapotBuffers(normalProgId);
-	validateProgram(normalProgId);
-
-	solidProgId = compileShaders((char*)"vertex.glsl", (char*)"solidfrag.glsl");
-	glUseProgram(solidProgId);
-	validateProgram(solidProgId);
+		fov = cam->mHorizontalFOV;
+		// TODO: aspectRatio = cam->mAspect;
+		znear = cam->mClipPlaneNear;
+		zfar = cam->mClipPlaneFar;
+	}
 
-	textureProgId = compileShaders((char*)"texturevertex.glsl", (char*)"texturefrag.glsl");
-	glUseProgram(textureProgId);
-	validateProgram(textureProgId);
+	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);
+	}
 
-	monkeyHead = new Model("monkeyhead_smooth.dae", solidProgId);
-	chest = new Model("chest.dae", textureProgId);
+	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;
@@ -523,16 +282,10 @@ void timer(int _) {
 	if (keyStates['e'])
 		ySpeed = -0.1f;
 
-	if (keyStates['j']) chestPos.z += 0.1f;
-	if (keyStates['k']) chestPos.z -= 0.1f;
-	if (keyStates['h']) chestPos.x -= 0.1f;
-	if (keyStates['l']) chestPos.x += 0.1f;
-	if (keyStates['m']) chestPos.y -= 0.1f;
-	if (keyStates['n']) chestPos.y += 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);
 }
@@ -541,6 +294,7 @@ int prevMouseX, prevMouseY;
 bool firstMouse = true;
 
 void motion(int x, int y) {
+#ifdef ENABLE_MOVEMENT
 	if (firstMouse) {
 		prevMouseX = x;
 		prevMouseY = y;
@@ -566,6 +320,7 @@ void motion(int x, int y) {
 	} else {
 		camUp = glm::vec3(0, 1, 0);
 	}
+#endif
 }
 
 void mouse(int button, int state, int x, int y) {
@@ -573,12 +328,17 @@ 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(WIDTH, HEIGHT);
-	int win = glutCreateWindow("Hello Triangle");
+	glutInitWindowSize(windowWidth, windowHeight);
+	glutCreateWindow("Physically Based Rendering");
 	glutDisplayFunc(display);
+	glutReshapeFunc(reshape);
 
 	glewInit();