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source: opengl-game/new-game.cpp@ 3effd81

feature/imgui-sdl points-test

Last change on this file since 3effd81 was 3effd81, checked in by Dmitry Portnoy <dmp1488@…>, 6 years ago
Change addLaserToScene() to position the laser between the correct endpoints and rotate it towards the camera so perceived width is constant.
Property mode set to `100644`
File size: 64.4 KB

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1	#include "logger.h"
2
3	#include "stb_image.h"
4
5	// I think this was for the OpenGL 4 book font file tutorial
6	//#define STB_IMAGE_WRITE_IMPLEMENTATION
7	//#include "stb_image_write.h"
8
9	#define _USE_MATH_DEFINES
10
11	#include <glm/mat4x4.hpp>
12	#include <glm/gtc/matrix_transform.hpp>
13	#include <glm/gtc/type_ptr.hpp>
14
15	#include "IMGUI/imgui.h"
16	#include "imgui_impl_glfw_gl3.h"
17
18	#include <GL/glew.h>
19	#include <GLFW/glfw3.h>
20
21	#include <cstdio>
22	#include <cstdlib>
23	#include <ctime>
24	#include <iostream>
25	#include <fstream>
26	#include <cmath>
27	#include <string>
28	#include <array>
29	#include <vector>
30	#include <queue>
31	#include <map>
32
33	using namespace std;
34	using namespace glm;
35
36	enum State {
37	STATE_MAIN_MENU,
38	STATE_GAME,
39	};
40
41	enum Event {
42	EVENT_GO_TO_MAIN_MENU,
43	EVENT_GO_TO_GAME,
44	EVENT_QUIT,
45	};
46
47	enum ObjectType {
48	TYPE_SHIP,
49	TYPE_ASTEROID,
50	TYPE_LASER,
51	};
52
53	struct SceneObject {
54	unsigned int id;
55	ObjectType type;
56
57	// Currently, model_transform should only have translate, and rotation and scale need to be done in model_base since
58	// they need to be done when the object is at the origin. I should change this to have separate scale, rotate, and translate
59	// matrices for each object that can be updated independently and then applied to the object in that order.
60	mat4 model_mat, model_base, model_transform;
61	mat4 translate_mat; // beginning of doing what's mentioned above
62	GLuint shader_program;
63	unsigned int num_points;
64	GLuint vertex_vbo_offset;
65	GLuint ubo_offset;
66	vector<GLfloat> points;
67	vector<GLfloat> colors;
68	vector<GLfloat> texcoords;
69	vector<GLfloat> normals;
70	vector<GLfloat> selected_colors;
71	bool deleted;
72	vec3 bounding_center;
73	GLfloat bounding_radius;
74	};
75
76	struct BufferInfo {
77	unsigned int vbo_base;
78	unsigned int vbo_offset;
79	unsigned int vbo_capacity;
80	unsigned int ubo_base;
81	unsigned int ubo_offset;
82	unsigned int ubo_capacity;
83	};
84
85	void glfw_error_callback(int error, const char* description);
86
87	void mouse_button_callback(GLFWwindow* window, int button, int action, int mods);
88	void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods);
89
90	bool faceClicked(array<vec3, 3> points, SceneObject* obj, vec4 world_ray, vec4 cam, vec4& click_point);
91	bool insideTriangle(vec3 p, array<vec3, 3> triangle_points);
92
93	GLuint loadShader(GLenum type, string file);
94	GLuint loadShaderProgram(string vertexShaderPath, string fragmentShaderPath);
95	unsigned char* loadImage(string file_name, int* x, int* y);
96
97	void printVector(string label, vec3 v);
98	void print4DVector(string label, vec4 v);
99
100	void addObjectToSceneDuringInit(SceneObject& obj);
101	void addObjectToScene(SceneObject& obj, map<GLuint, BufferInfo>& shaderBufferInfo,
102	GLuint points_vbo,
103	GLuint colors_vbo,
104	GLuint selected_colors_vbo,
105	GLuint texcoords_vbo,
106	GLuint normals_vbo,
107	GLuint ubo,
108	GLuint model_mat_idx_vbo);
109	void removeObjectFromScene(SceneObject& obj, GLuint ubo);
110
111	void calculateObjectBoundingBox(SceneObject& obj);
112
113	void addLaserToScene(vec3 start, vec3 end, vec3 color, GLfloat width, GLuint laser_sp);
114
115	void initializeBuffers(
116	GLuint* points_vbo,
117	GLuint* colors_vbo,
118	GLuint* selected_colors_vbo,
119	GLuint* texcoords_vbo,
120	GLuint* normals_vbo,
121	GLuint* ubo,
122	GLuint* model_mat_idx_vbo);
123
124	void populateBuffers(vector<SceneObject>& objects,
125	map<GLuint, BufferInfo>& shaderBufferInfo,
126	GLuint points_vbo,
127	GLuint colors_vbo,
128	GLuint selected_colors_vbo,
129	GLuint texcoords_vbo,
130	GLuint normals_vbo,
131	GLuint ubo,
132	GLuint model_mat_idx_vbo);
133
134	void copyObjectDataToBuffers(SceneObject& obj,
135	map<GLuint, BufferInfo>& shaderBufferInfo,
136	GLuint points_vbo,
137	GLuint colors_vbo,
138	GLuint selected_colors_vbo,
139	GLuint texcoords_vbo,
140	GLuint normals_vbo,
141	GLuint ubo,
142	GLuint model_mat_idx_vbo);
143
144	void transformObject(SceneObject& obj, const mat4& transform, GLuint ubo);
145
146	void renderMainMenu();
147	void renderMainMenuGui();
148
149	void renderScene(map<GLuint, BufferInfo>& shaderBufferInfo,
150	GLuint color_sp, GLuint texture_sp, GLuint laser_sp,
151	GLuint color_vao, GLuint texture_vao, GLuint laser_vao,
152	GLuint colors_vbo, GLuint selected_colors_vbo,
153	SceneObject* selectedObject);
154	void renderSceneGui();
155
156	void spawnAsteroid(vec3 pos, GLuint shader,
157	map<GLuint, BufferInfo>& shaderBufferInfo,
158	GLuint points_vbo,
159	GLuint colors_vbo,
160	GLuint selected_colors_vbo,
161	GLuint texcoords_vbo,
162	GLuint normals_vbo,
163	GLuint ubo,
164	GLuint model_mat_idx_vbo);
165
166	float getRandomNum(float low, float high);
167
168	#define NUM_KEYS (512)
169	#define ONE_DEG_IN_RAD ((2.0f * M_PI) / 360.0f) // 0.017444444 (maybe make this a const instead)
170
171	const int KEY_STATE_UNCHANGED = -1;
172	const bool FULLSCREEN = false;
173	const bool SHOW_FPS = false;
174	const bool DISABLE_VSYNC = false; // disable vsync to see real framerate
175	unsigned int MAX_UNIFORMS = 0; // Requires OpenGL constants only available at runtime, so it can't be const
176
177	int key_state[NUM_KEYS];
178	bool key_pressed[NUM_KEYS];
179
180	int width = 640;
181	int height = 480;
182
183	double fps;
184
185	vec3 cam_pos;
186
187	mat4 view_mat;
188	mat4 proj_mat;
189
190	// TODO: Consider using a list instead since it will make element deletion more efficient
191	vector<SceneObject> objects;
192	queue<Event> events;
193
194	SceneObject* clickedObject = NULL;
195	SceneObject* selectedObject = NULL;
196
197	float NEAR_CLIP = 0.1f;
198	float FAR_CLIP = 100.0f;
199
200	// TODO: Should really have some array or struct of UI-related variables
201	bool isRunning = true;
202
203	ImVec4 clear_color = ImVec4(0.45f, 0.55f, 0.60f, 1.00f);
204
205	/*
206	* TODO: Make lasers shoot from the ends of the ship's wings when the user presses a button and disappear after a second or so
207	* TODO: Asteroid movement currently depends on framerate, fix this in a generic/reusable way
208	*/
209
210	int main(int argc, char* argv[]) {
211	cout << "New OpenGL Game" << endl;
212
213	if (!restart_gl_log()) {}
214	gl_log("starting GLFW\n%s\n", glfwGetVersionString());
215
216	glfwSetErrorCallback(glfw_error_callback);
217	if (!glfwInit()) {
218	fprintf(stderr, "ERROR: could not start GLFW3\n");
219	return 1;
220	}
221
222	#ifdef __APPLE__
223	glfwWindowHint(GLFW_CONTEXT_VERSION_MAJOR, 3);
224	glfwWindowHint(GLFW_CONTEXT_VERSION_MINOR, 3);
225	glfwWindowHint(GLFW_OPENGL_FORWARD_COMPAT, GL_TRUE);
226	glfwWindowHint(GLFW_OPENGL_PROFILE, GLFW_OPENGL_CORE_PROFILE);
227	#endif
228
229	glfwWindowHint(GLFW_SAMPLES, 16);
230
231	GLFWwindow* window = NULL;
232	GLFWmonitor* mon = NULL;
233
234	if (FULLSCREEN) {
235	mon = glfwGetPrimaryMonitor();
236	const GLFWvidmode* vmode = glfwGetVideoMode(mon);
237
238	width = vmode->width;
239	height = vmode->height;
240	cout << "Fullscreen resolution " << vmode->width << "x" << vmode->height << endl;
241	}
242	window = glfwCreateWindow(width, height, "New OpenGL Game", mon, NULL);
243
244	if (!window) {
245	fprintf(stderr, "ERROR: could not open window with GLFW3\n");
246	glfwTerminate();
247	return 1;
248	}
249
250	glfwMakeContextCurrent(window);
251	glewExperimental = GL_TRUE;
252	glewInit();
253
254	srand(time(0));
255
256	/*
257	* RENDERING ALGORITHM NOTES:
258	*
259	* Basically, I need to split my objects into groups, so that each group fits into
260	* GL_MAX_UNIFORM_BLOCK_SIZE. I need to have an offset and a size for each group.
261	* Getting the offset is straitforward. The size may as well be GL_MAX_UNIFORM_BLOCK_SIZE
262	* for each group, since it seems that smaller sizes just round up to the nearest GL_MAX_UNIFORM_BLOCK_SIZE
263	*
264	* I'll need to have a loop inside my render loop that calls glBindBufferRange(GL_UNIFORM_BUFFER, ...
265	* for every 1024 objects and then draws all those objects with one glDraw call.
266	*
267	* Since I currently have very few objects, I'll wait to implement this until I have
268	* a reasonable number of objects always using the same shader.
269	*/
270
271	GLint UNIFORM_BUFFER_OFFSET_ALIGNMENT, MAX_UNIFORM_BLOCK_SIZE;
272	glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &UNIFORM_BUFFER_OFFSET_ALIGNMENT);
273	glGetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE, &MAX_UNIFORM_BLOCK_SIZE);
274
275	MAX_UNIFORMS = MAX_UNIFORM_BLOCK_SIZE / sizeof(mat4);
276
277	cout << "UNIFORM_BUFFER_OFFSET_ALIGNMENT: " << UNIFORM_BUFFER_OFFSET_ALIGNMENT << endl;
278	cout << "MAX_UNIFORMS: " << MAX_UNIFORMS << endl;
279
280	// Setup Dear ImGui binding
281	IMGUI_CHECKVERSION();
282	ImGui::CreateContext();
283	ImGuiIO& io = ImGui::GetIO(); (void)io;
284	//io.ConfigFlags \|= ImGuiConfigFlags_NavEnableKeyboard; // Enable Keyboard Controls
285	//io.ConfigFlags \|= ImGuiConfigFlags_NavEnableGamepad; // Enable Gamepad Controls
286	ImGui_ImplGlfwGL3_Init(window, true);
287
288	// Setup style
289	ImGui::StyleColorsDark();
290	//ImGui::StyleColorsClassic();
291
292	glfwSetMouseButtonCallback(window, mouse_button_callback);
293	glfwSetKeyCallback(window, key_callback);
294
295	const GLubyte* renderer = glGetString(GL_RENDERER);
296	const GLubyte* version = glGetString(GL_VERSION);
297	printf("Renderer: %s\n", renderer);
298	printf("OpenGL version supported %s\n", version);
299
300	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
301
302	glEnable(GL_DEPTH_TEST);
303	glDepthFunc(GL_LESS);
304
305	glEnable(GL_CULL_FACE);
306	// glCullFace(GL_BACK);
307	// glFrontFace(GL_CW);
308
309	/*
310	int x, y;
311	unsigned char* texImage = loadImage("test.png", &x, &y);
312	if (texImage) {
313	cout << "Yay, I loaded an image!" << endl;
314	cout << x << endl;
315	cout << y << endl;
316	printf("first 4 bytes are: %i %i %i %i\n", texImage[0], texImage[1], texImage[2], texImage[3]);
317	}
318
319	GLuint testTex = 0;
320	glGenTextures(1, &testTex);
321	glActiveTexture(GL_TEXTURE0);
322	glBindTexture(GL_TEXTURE_2D, testTex);
323	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, texImage);
324
325	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
326	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
327	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
328	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
329	*/
330
331	int x, y;
332	unsigned char* texImage = loadImage("laser.png", &x, &y);
333	if (texImage) {
334	cout << "Laser texture loaded successfully!" << endl;
335	cout << x << endl;
336	cout << y << endl;
337	printf("first 4 bytes are: %i %i %i %i\n", texImage[0], texImage[1], texImage[2], texImage[3]);
338	}
339
340	GLuint laserTex = 0;
341	glGenTextures(1, &laserTex);
342	glActiveTexture(GL_TEXTURE0);
343	glBindTexture(GL_TEXTURE_2D, laserTex);
344	glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, x, y, 0, GL_RGBA, GL_UNSIGNED_BYTE, texImage);
345
346	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
347	glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
348	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
349	glTexParameterf(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
350
351	/* RENDERING ALGORITHM
352	*
353	* Create a separate vbo for each of the following things:
354	* - points
355	* - colors
356	* - texture coordinates
357	* - selected colors
358	* - normals
359	* - indices into a ubo that stores a model matrix for each object
360	*
361	* Also, make a model matrix ubo, the entirety of which will be passed to the vertex shader.
362	* The vbo containing the correct index into the ubo (mentioned above) will be used to select
363	* the right model matrix for each point. The index in the vbo will be the saem for all points
364	* of any given object.
365	*
366	* There will be two shader programs for now, one for draing colored objects, and another for
367	* drawing textured ones. The points, normals, and model mat ubo indices will be passed to both
368	* shaders, while the colors vbo will only be passed to the colors shader, and the texcoords vbo
369	* only to the texture shader.
370	*
371	* Right now, the currently selected object is drawn using one color (specified in the selected
372	* colors vbo) regardless of whether it is normally rendering using colors or a texture. The selected
373	* object is rendering by binding the selected colors vbo in place of the colors vbo and using the colors
374	* shader. Then, the selected object is redrawn along with all other objects, but the depth buffer test
375	* prevents the unselected version of the object from appearing on the screen. This lets me render all the
376	* objects that use a particular shader using one glDrawArrays() call.
377	*/
378
379	map<GLuint, BufferInfo> shaderBufferInfo;
380
381	GLuint color_sp = loadShaderProgram("./color.vert", "./color.frag");
382	GLuint texture_sp = loadShaderProgram("./texture.vert", "./texture.frag");
383	GLuint laser_sp = loadShaderProgram("./laser.vert", "./laser.frag");
384
385	shaderBufferInfo[color_sp] = BufferInfo();
386	shaderBufferInfo[texture_sp] = BufferInfo();
387	shaderBufferInfo[laser_sp] = BufferInfo();
388
389	cam_pos = vec3(0.0f, 0.0f, 2.0f);
390	float cam_yaw = 0.0f * 2.0f * 3.14159f / 360.0f;
391	float cam_pitch = -50.0f * 2.0f * 3.14159f / 360.0f;
392
393	SceneObject obj;
394	mat4 T_model, R_model;
395
396	// TODO: Confirm there's nothing I need from the commented out models and delete them
397	// (Check to make sure the textured square is drawn correctly)
398
399	/*
400	// triangle
401	obj = SceneObject();
402	obj.shader_program = color_sp;
403	obj.points = {
404	0.0f, 0.5f, 0.0f,
405	-0.5f, -0.5f, 0.0f,
406	0.5f, -0.5f, 0.0f,
407	0.5f, -0.5f, 0.0f,
408	-0.5f, -0.5f, 0.0f,
409	0.0f, 0.5f, 0.0f,
410	};
411	obj.colors = {
412	1.0f, 0.0f, 0.0f,
413	0.0f, 0.0f, 1.0f,
414	0.0f, 1.0f, 0.0f,
415	0.0f, 1.0f, 0.0f,
416	0.0f, 0.0f, 1.0f,
417	1.0f, 0.0f, 0.0f,
418	};
419	obj.texcoords = { 0.0f };
420	obj.selected_colors = {
421	0.0f, 1.0f, 0.0f,
422	0.0f, 1.0f, 0.0f,
423	0.0f, 1.0f, 0.0f,
424	0.0f, 1.0f, 0.0f,
425	0.0f, 1.0f, 0.0f,
426	0.0f, 1.0f, 0.0f,
427	};
428
429	T_model = translate(mat4(1.0f), vec3(0.45f, -1.5f, 0.0f));
430	R_model = rotate(mat4(1.0f), 0.0f, vec3(0.0f, 1.0f, 0.0f));
431	obj.model_base = T_model*R_model;
432
433	addObjectToSceneDuringInit(obj);
434
435	// square
436	obj = SceneObject();
437	obj.shader_program = texture_sp;
438	obj.points = {
439	0.5f, 0.5f, 0.0f,
440	-0.5f, 0.5f, 0.0f,
441	-0.5f, -0.5f, 0.0f,
442	0.5f, 0.5f, 0.0f,
443	-0.5f, -0.5f, 0.0f,
444	0.5f, -0.5f, 0.0f,
445	};
446	obj.colors = { 0.0f };
447	obj.texcoords = {
448	1.0f, 1.0f,
449	0.0f, 1.0f,
450	0.0f, 0.0f,
451	1.0f, 1.0f,
452	0.0f, 0.0f,
453	1.0f, 0.0f
454	};
455	obj.selected_colors = {
456	0.0f, 0.6f, 0.9f,
457	0.0f, 0.6f, 0.9f,
458	0.0f, 0.6f, 0.9f,
459	0.0f, 0.6f, 0.9f,
460	0.0f, 0.6f, 0.9f,
461	0.0f, 0.6f, 0.9f,
462	};
463
464	T_model = translate(mat4(1.0f), vec3(-0.5f, -1.5f, -1.00f));
465	R_model = rotate(mat4(1.0f), 0.5f, vec3(0.0f, 1.0f, 0.0f));
466	obj.model_base = T_model*R_model;
467
468	addObjectToSceneDuringInit(obj);
469	*/
470
471	// player ship
472	obj = SceneObject();
473	obj.type = TYPE_SHIP;
474	obj.shader_program = color_sp;
475	obj.points = {
476	//back
477	-0.5f, 0.3f, 0.0f,
478	-0.5f, 0.0f, 0.0f,
479	0.5f, 0.0f, 0.0f,
480	-0.5f, 0.3f, 0.0f,
481	0.5f, 0.0f, 0.0f,
482	0.5f, 0.3f, 0.0f,
483
484	// left back
485	-0.5f, 0.3f, -2.0f,
486	-0.5f, 0.0f, -2.0f,
487	-0.5f, 0.0f, 0.0f,
488	-0.5f, 0.3f, -2.0f,
489	-0.5f, 0.0f, 0.0f,
490	-0.5f, 0.3f, 0.0f,
491
492	// right back
493	0.5f, 0.3f, 0.0f,
494	0.5f, 0.0f, 0.0f,
495	0.5f, 0.0f, -2.0f,
496	0.5f, 0.3f, 0.0f,
497	0.5f, 0.0f, -2.0f,
498	0.5f, 0.3f, -2.0f,
499
500	// left mid
501	-0.25f, 0.3f, -3.0f,
502	-0.25f, 0.0f, -3.0f,
503	-0.5f, 0.0f, -2.0f,
504	-0.25f, 0.3f, -3.0f,
505	-0.5f, 0.0f, -2.0f,
506	-0.5f, 0.3f, -2.0f,
507
508	// right mid
509	0.5f, 0.3f, -2.0f,
510	0.5f, 0.0f, -2.0f,
511	0.25f, 0.0f, -3.0f,
512	0.5f, 0.3f, -2.0f,
513	0.25f, 0.0f, -3.0f,
514	0.25f, 0.3f, -3.0f,
515
516	// left front
517	0.0f, 0.0f, -3.5f,
518	-0.25f, 0.0f, -3.0f,
519	-0.25f, 0.3f, -3.0f,
520
521	// right front
522	0.25f, 0.3f, -3.0f,
523	0.25f, 0.0f, -3.0f,
524	0.0f, 0.0f, -3.5f,
525
526	// top back
527	-0.5f, 0.3f, -2.0f,
528	-0.5f, 0.3f, 0.0f,
529	0.5f, 0.3f, 0.0f,
530	-0.5f, 0.3f, -2.0f,
531	0.5f, 0.3f, 0.0f,
532	0.5f, 0.3f, -2.0f,
533
534	// bottom back
535	-0.5f, 0.0f, 0.0f,
536	-0.5f, 0.0f, -2.0f,
537	0.5f, 0.0f, 0.0f,
538	0.5f, 0.0f, 0.0f,
539	-0.5f, 0.0f, -2.0f,
540	0.5f, 0.0f, -2.0f,
541
542	// top mid
543	-0.25f, 0.3f, -3.0f,
544	-0.5f, 0.3f, -2.0f,
545	0.5f, 0.3f, -2.0f,
546	-0.25f, 0.3f, -3.0f,
547	0.5f, 0.3f, -2.0f,
548	0.25f, 0.3f, -3.0f,
549
550	// bottom mid
551	-0.5f, 0.0f, -2.0f,
552	-0.25f, 0.0f, -3.0f,
553	0.5f, 0.0f, -2.0f,
554	0.5f, 0.0f, -2.0f,
555	-0.25f, 0.0f, -3.0f,
556	0.25f, 0.0f, -3.0f,
557
558	// top front
559	-0.25f, 0.3f, -3.0f,
560	0.25f, 0.3f, -3.0f,
561	0.0f, 0.0f, -3.5f,
562
563	// bottom front
564	0.25f, 0.0f, -3.0f,
565	-0.25f, 0.0f, -3.0f,
566	0.0f, 0.0f, -3.5f,
567
568	// left wing start back
569	-1.5f, 0.3f, 0.0f,
570	-1.5f, 0.0f, 0.0f,
571	-0.5f, 0.0f, 0.0f,
572	-1.5f, 0.3f, 0.0f,
573	-0.5f, 0.0f, 0.0f,
574	-0.5f, 0.3f, 0.0f,
575
576	// left wing start top
577	-0.5f, 0.3f, -0.3f,
578	-1.3f, 0.3f, -0.3f,
579	-1.5f, 0.3f, 0.0f,
580	-0.5f, 0.3f, -0.3f,
581	-1.5f, 0.3f, 0.0f,
582	-0.5f, 0.3f, 0.0f,
583
584	// left wing start front
585	-0.5f, 0.3f, -0.3f,
586	-0.5f, 0.0f, -0.3f,
587	-1.3f, 0.0f, -0.3f,
588	-0.5f, 0.3f, -0.3f,
589	-1.3f, 0.0f, -0.3f,
590	-1.3f, 0.3f, -0.3f,
591
592	// left wing start bottom
593	-0.5f, 0.0f, 0.0f,
594	-1.5f, 0.0f, 0.0f,
595	-1.3f, 0.0f, -0.3f,
596	-0.5f, 0.0f, 0.0f,
597	-1.3f, 0.0f, -0.3f,
598	-0.5f, 0.0f, -0.3f,
599
600	// left wing end outside
601	-1.5f, 0.3f, 0.0f,
602	-2.2f, 0.15f, -0.8f,
603	-1.5f, 0.0f, 0.0f,
604
605	// left wing end top
606	-1.3f, 0.3f, -0.3f,
607	-2.2f, 0.15f, -0.8f,
608	-1.5f, 0.3f, 0.0f,
609
610	// left wing end front
611	-1.3f, 0.0f, -0.3f,
612	-2.2f, 0.15f, -0.8f,
613	-1.3f, 0.3f, -0.3f,
614
615	// left wing end bottom
616	-1.5f, 0.0f, 0.0f,
617	-2.2f, 0.15f, -0.8f,
618	-1.3f, 0.0f, -0.3f,
619
620	// right wing start back
621	1.5f, 0.0f, 0.0f,
622	1.5f, 0.3f, 0.0f,
623	0.5f, 0.0f, 0.0f,
624	0.5f, 0.0f, 0.0f,
625	1.5f, 0.3f, 0.0f,
626	0.5f, 0.3f, 0.0f,
627
628	// right wing start top
629	1.3f, 0.3f, -0.3f,
630	0.5f, 0.3f, -0.3f,
631	1.5f, 0.3f, 0.0f,
632	1.5f, 0.3f, 0.0f,
633	0.5f, 0.3f, -0.3f,
634	0.5f, 0.3f, 0.0f,
635
636	// right wing start front
637	0.5f, 0.0f, -0.3f,
638	0.5f, 0.3f, -0.3f,
639	1.3f, 0.0f, -0.3f,
640	1.3f, 0.0f, -0.3f,
641	0.5f, 0.3f, -0.3f,
642	1.3f, 0.3f, -0.3f,
643
644	// right wing start bottom
645	1.5f, 0.0f, 0.0f,
646	0.5f, 0.0f, 0.0f,
647	1.3f, 0.0f, -0.3f,
648	1.3f, 0.0f, -0.3f,
649	0.5f, 0.0f, 0.0f,
650	0.5f, 0.0f, -0.3f,
651
652	// right wing end outside
653	2.2f, 0.15f, -0.8f,
654	1.5f, 0.3f, 0.0f,
655	1.5f, 0.0f, 0.0f,
656
657	// right wing end top
658	2.2f, 0.15f, -0.8f,
659	1.3f, 0.3f, -0.3f,
660	1.5f, 0.3f, 0.0f,
661
662	// right wing end front
663	2.2f, 0.15f, -0.8f,
664	1.3f, 0.0f, -0.3f,
665	1.3f, 0.3f, -0.3f,
666
667	// right wing end bottom
668	2.2f, 0.15f, -0.8f,
669	1.5f, 0.0f, 0.0f,
670	1.3f, 0.0f, -0.3f,
671	};
672	obj.colors = {
673	0.0f, 0.0f, 0.3f,
674	0.0f, 0.0f, 0.3f,
675	0.0f, 0.0f, 0.3f,
676	0.0f, 0.0f, 0.3f,
677	0.0f, 0.0f, 0.3f,
678	0.0f, 0.0f, 0.3f,
679
680	0.0f, 0.0f, 0.3f,
681	0.0f, 0.0f, 0.3f,
682	0.0f, 0.0f, 0.3f,
683	0.0f, 0.0f, 0.3f,
684	0.0f, 0.0f, 0.3f,
685	0.0f, 0.0f, 0.3f,
686
687	0.0f, 0.0f, 0.3f,
688	0.0f, 0.0f, 0.3f,
689	0.0f, 0.0f, 0.3f,
690	0.0f, 0.0f, 0.3f,
691	0.0f, 0.0f, 0.3f,
692	0.0f, 0.0f, 0.3f,
693
694	0.0f, 0.0f, 0.3f,
695	0.0f, 0.0f, 0.3f,
696	0.0f, 0.0f, 0.3f,
697	0.0f, 0.0f, 0.3f,
698	0.0f, 0.0f, 0.3f,
699	0.0f, 0.0f, 0.3f,
700
701	0.0f, 0.0f, 0.3f,
702	0.0f, 0.0f, 0.3f,
703	0.0f, 0.0f, 0.3f,
704	0.0f, 0.0f, 0.3f,
705	0.0f, 0.0f, 0.3f,
706	0.0f, 0.0f, 0.3f,
707
708	0.0f, 0.0f, 1.0f,
709	0.0f, 0.0f, 1.0f,
710	0.0f, 0.0f, 1.0f,
711
712	0.0f, 0.0f, 1.0f,
713	0.0f, 0.0f, 1.0f,
714	0.0f, 0.0f, 1.0f,
715
716	0.0f, 0.0f, 1.0f,
717	0.0f, 0.0f, 1.0f,
718	0.0f, 0.0f, 1.0f,
719	0.0f, 0.0f, 1.0f,
720	0.0f, 0.0f, 1.0f,
721	0.0f, 0.0f, 1.0f,
722
723	0.0f, 0.0f, 1.0f,
724	0.0f, 0.0f, 1.0f,
725	0.0f, 0.0f, 1.0f,
726	0.0f, 0.0f, 1.0f,
727	0.0f, 0.0f, 1.0f,
728	0.0f, 0.0f, 1.0f,
729
730	0.0f, 0.0f, 1.0f,
731	0.0f, 0.0f, 1.0f,
732	0.0f, 0.0f, 1.0f,
733	0.0f, 0.0f, 1.0f,
734	0.0f, 0.0f, 1.0f,
735	0.0f, 0.0f, 1.0f,
736
737	0.0f, 0.0f, 1.0f,
738	0.0f, 0.0f, 1.0f,
739	0.0f, 0.0f, 1.0f,
740	0.0f, 0.0f, 1.0f,
741	0.0f, 0.0f, 1.0f,
742	0.0f, 0.0f, 1.0f,
743
744	0.0f, 0.0f, 0.3f,
745	0.0f, 0.0f, 0.3f,
746	0.0f, 0.0f, 0.3f,
747
748	0.0f, 0.0f, 0.3f,
749	0.0f, 0.0f, 0.3f,
750	0.0f, 0.0f, 0.3f,
751
752	0.0f, 0.0f, 0.3f,
753	0.0f, 0.0f, 0.3f,
754	0.0f, 0.0f, 0.3f,
755	0.0f, 0.0f, 0.3f,
756	0.0f, 0.0f, 0.3f,
757	0.0f, 0.0f, 0.3f,
758
759	0.0f, 0.0f, 0.3f,
760	0.0f, 0.0f, 0.3f,
761	0.0f, 0.0f, 0.3f,
762	0.0f, 0.0f, 0.3f,
763	0.0f, 0.0f, 0.3f,
764	0.0f, 0.0f, 0.3f,
765
766	0.0f, 0.0f, 0.3f,
767	0.0f, 0.0f, 0.3f,
768	0.0f, 0.0f, 0.3f,
769	0.0f, 0.0f, 0.3f,
770	0.0f, 0.0f, 0.3f,
771	0.0f, 0.0f, 0.3f,
772
773	0.0f, 0.0f, 0.3f,
774	0.0f, 0.0f, 0.3f,
775	0.0f, 0.0f, 0.3f,
776	0.0f, 0.0f, 0.3f,
777	0.0f, 0.0f, 0.3f,
778	0.0f, 0.0f, 0.3f,
779
780	0.0f, 0.0f, 0.3f,
781	0.0f, 0.0f, 0.3f,
782	0.0f, 0.0f, 0.3f,
783
784	0.0f, 0.0f, 0.3f,
785	0.0f, 0.0f, 0.3f,
786	0.0f, 0.0f, 0.3f,
787
788	0.0f, 0.0f, 0.3f,
789	0.0f, 0.0f, 0.3f,
790	0.0f, 0.0f, 0.3f,
791
792	0.0f, 0.0f, 0.3f,
793	0.0f, 0.0f, 0.3f,
794	0.0f, 0.0f, 0.3f,
795
796	0.0f, 0.0f, 0.3f,
797	0.0f, 0.0f, 0.3f,
798	0.0f, 0.0f, 0.3f,
799	0.0f, 0.0f, 0.3f,
800	0.0f, 0.0f, 0.3f,
801	0.0f, 0.0f, 0.3f,
802
803	0.0f, 0.0f, 0.3f,
804	0.0f, 0.0f, 0.3f,
805	0.0f, 0.0f, 0.3f,
806	0.0f, 0.0f, 0.3f,
807	0.0f, 0.0f, 0.3f,
808	0.0f, 0.0f, 0.3f,
809
810	0.0f, 0.0f, 0.3f,
811	0.0f, 0.0f, 0.3f,
812	0.0f, 0.0f, 0.3f,
813	0.0f, 0.0f, 0.3f,
814	0.0f, 0.0f, 0.3f,
815	0.0f, 0.0f, 0.3f,
816
817	0.0f, 0.0f, 0.3f,
818	0.0f, 0.0f, 0.3f,
819	0.0f, 0.0f, 0.3f,
820	0.0f, 0.0f, 0.3f,
821	0.0f, 0.0f, 0.3f,
822	0.0f, 0.0f, 0.3f,
823
824	0.0f, 0.0f, 0.3f,
825	0.0f, 0.0f, 0.3f,
826	0.0f, 0.0f, 0.3f,
827
828	0.0f, 0.0f, 0.3f,
829	0.0f, 0.0f, 0.3f,
830	0.0f, 0.0f, 0.3f,
831
832	0.0f, 0.0f, 0.3f,
833	0.0f, 0.0f, 0.3f,
834	0.0f, 0.0f, 0.3f,
835
836	0.0f, 0.0f, 0.3f,
837	0.0f, 0.0f, 0.3f,
838	0.0f, 0.0f, 0.3f,
839	};
840	obj.texcoords = { 0.0f };
841	obj.selected_colors = { 0.0f };
842
843	T_model = translate(mat4(1.0f), vec3(0.0f, -1.2f, 1.65f));
844	R_model = rotate(mat4(1.0f), 20.0f * (float)ONE_DEG_IN_RAD, vec3(1.0f, 0.0f, 0.0f));
845	R_model = mat4(1.0f);
846	obj.model_base = T_model * R_model * scale(mat4(1.0f), vec3(0.1f, 0.1f, 0.1f));
847
848	obj.translate_mat = T_model;
849
850	addObjectToSceneDuringInit(obj);
851
852	addLaserToScene(vec3(0.34f, -2.0f, 1.6f), vec3(0.34f, -2.0f, -3.0f), vec3(0.0f, 1.0f, 0.0f), 0.04f, laser_sp);
853	addLaserToScene(vec3(-0.34f, -2.0f, 1.6f), vec3(-0.34f, -2.0f, -3.0f), vec3(0.0f, 1.0f, 0.0f), 0.04f, laser_sp);
854
855	vector<SceneObject>::iterator obj_it;
856
857	GLuint points_vbo, colors_vbo, selected_colors_vbo, texcoords_vbo,
858	normals_vbo, ubo, model_mat_idx_vbo;
859
860	initializeBuffers(
861	&points_vbo,
862	&colors_vbo,
863	&selected_colors_vbo,
864	&texcoords_vbo,
865	&normals_vbo,
866	&ubo,
867	&model_mat_idx_vbo);
868
869	populateBuffers(objects,
870	shaderBufferInfo,
871	points_vbo,
872	colors_vbo,
873	selected_colors_vbo,
874	texcoords_vbo,
875	normals_vbo,
876	ubo,
877	model_mat_idx_vbo);
878
879	GLuint color_vao = 0;
880	glGenVertexArrays(1, &color_vao);
881	glBindVertexArray(color_vao);
882
883	glEnableVertexAttribArray(0);
884	glEnableVertexAttribArray(1);
885	glEnableVertexAttribArray(2);
886	glEnableVertexAttribArray(3);
887
888	glBindBuffer(GL_ARRAY_BUFFER, points_vbo);
889	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
890
891	glBindBuffer(GL_ARRAY_BUFFER, normals_vbo);
892	glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, 0, 0);
893
894	glBindBuffer(GL_ARRAY_BUFFER, model_mat_idx_vbo);
895	glVertexAttribIPointer(3, 1, GL_UNSIGNED_INT, 0, 0);
896
897	GLuint texture_vao = 0;
898	glGenVertexArrays(1, &texture_vao);
899	glBindVertexArray(texture_vao);
900
901	glEnableVertexAttribArray(0);
902	glEnableVertexAttribArray(1);
903	glEnableVertexAttribArray(2);
904	glEnableVertexAttribArray(3);
905
906	glBindBuffer(GL_ARRAY_BUFFER, points_vbo);
907	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
908
909	glBindBuffer(GL_ARRAY_BUFFER, texcoords_vbo);
910	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, 0);
911
912	glBindBuffer(GL_ARRAY_BUFFER, normals_vbo);
913	glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, 0, 0);
914
915	glBindBuffer(GL_ARRAY_BUFFER, model_mat_idx_vbo);
916	glVertexAttribIPointer(3, 1, GL_UNSIGNED_INT, 0, 0);
917
918	GLuint laser_vao = 0;
919	glGenVertexArrays(1, &laser_vao);
920	glBindVertexArray(laser_vao);
921
922	glEnableVertexAttribArray(0);
923	glEnableVertexAttribArray(1);
924	glEnableVertexAttribArray(2);
925
926	glBindBuffer(GL_ARRAY_BUFFER, points_vbo);
927	glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 0, 0);
928
929	glBindBuffer(GL_ARRAY_BUFFER, texcoords_vbo);
930	glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 0, 0);
931
932	glBindBuffer(GL_ARRAY_BUFFER, model_mat_idx_vbo);
933	glVertexAttribIPointer(2, 1, GL_UNSIGNED_INT, 0, 0);
934
935	float cam_speed = 1.0f;
936	float cam_yaw_speed = 60.0f*ONE_DEG_IN_RAD;
937	float cam_pitch_speed = 60.0f*ONE_DEG_IN_RAD;
938
939	// glm::lookAt can create the view matrix
940	// glm::perspective can create the projection matrix
941
942	mat4 T = translate(mat4(1.0f), vec3(-cam_pos.x, -cam_pos.y, -cam_pos.z));
943	mat4 yaw_mat = rotate(mat4(1.0f), -cam_yaw, vec3(0.0f, 1.0f, 0.0f));
944	mat4 pitch_mat = rotate(mat4(1.0f), -cam_pitch, vec3(1.0f, 0.0f, 0.0f));
945	mat4 R = pitch_mat * yaw_mat;
946	view_mat = R*T;
947
948	// TODO: Create a function to construct the projection matrix
949	// (Maybe I should just use glm::perspective, after making sure it matches what I have now)
950	float fov = 67.0f * ONE_DEG_IN_RAD;
951	float aspect = (float)width / (float)height;
952
953	float range = tan(fov * 0.5f) * NEAR_CLIP;
954	float Sx = NEAR_CLIP / (range * aspect);
955	float Sy = NEAR_CLIP / range;
956	float Sz = -(FAR_CLIP + NEAR_CLIP) / (FAR_CLIP - NEAR_CLIP);
957	float Pz = -(2.0f * FAR_CLIP * NEAR_CLIP) / (FAR_CLIP - NEAR_CLIP);
958
959	float proj_arr[] = {
960	Sx, 0.0f, 0.0f, 0.0f,
961	0.0f, Sy, 0.0f, 0.0f,
962	0.0f, 0.0f, Sz, -1.0f,
963	0.0f, 0.0f, Pz, 0.0f,
964	};
965	proj_mat = make_mat4(proj_arr);
966
967	GLuint ub_binding_point = 0;
968
969	// TODO: Replace test_loc and mat_loc with more descriptive names
970	GLuint view_test_loc = glGetUniformLocation(color_sp, "view");
971	GLuint proj_test_loc = glGetUniformLocation(color_sp, "proj");
972	GLuint color_sp_ub_index = glGetUniformBlockIndex(color_sp, "models");
973
974	GLuint view_mat_loc = glGetUniformLocation(texture_sp, "view");
975	GLuint proj_mat_loc = glGetUniformLocation(texture_sp, "proj");
976	GLuint texture_sp_ub_index = glGetUniformBlockIndex(texture_sp, "models");
977
978	GLuint laser_view_mat_loc = glGetUniformLocation(laser_sp, "view");
979	GLuint laser_proj_mat_loc = glGetUniformLocation(laser_sp, "proj");
980	GLuint laser_color_loc = glGetUniformLocation(laser_sp, "laser_color");
981	GLuint laser_sp_ub_index = glGetUniformBlockIndex(laser_sp, "models");
982
983
984	glUseProgram(color_sp);
985	glUniformMatrix4fv(view_test_loc, 1, GL_FALSE, value_ptr(view_mat));
986	glUniformMatrix4fv(proj_test_loc, 1, GL_FALSE, value_ptr(proj_mat));
987
988	glUniformBlockBinding(color_sp, color_sp_ub_index, ub_binding_point);
989	glBindBufferRange(GL_UNIFORM_BUFFER, ub_binding_point, ubo, 0, GL_MAX_UNIFORM_BLOCK_SIZE);
990
991
992	glUseProgram(texture_sp);
993	glUniformMatrix4fv(view_mat_loc, 1, GL_FALSE, value_ptr(view_mat));
994	glUniformMatrix4fv(proj_mat_loc, 1, GL_FALSE, value_ptr(proj_mat));
995
996	glUniformBlockBinding(texture_sp, texture_sp_ub_index, ub_binding_point);
997	glBindBufferRange(GL_UNIFORM_BUFFER, ub_binding_point, ubo, 0, GL_MAX_UNIFORM_BLOCK_SIZE);
998
999
1000	glUseProgram(laser_sp);
1001	glUniformMatrix4fv(laser_view_mat_loc, 1, GL_FALSE, value_ptr(view_mat));
1002	glUniformMatrix4fv(laser_proj_mat_loc, 1, GL_FALSE, value_ptr(proj_mat));
1003	glUniform3f(laser_color_loc, 0.2f, 1.0f, 0.2f);
1004
1005	glUniformBlockBinding(laser_sp, laser_sp_ub_index, ub_binding_point);
1006	glBindBufferRange(GL_UNIFORM_BUFFER, ub_binding_point, ubo, 0, GL_MAX_UNIFORM_BLOCK_SIZE);
1007
1008
1009	bool cam_moved = false;
1010
1011	int frame_count = 0;
1012	double elapsed_seconds_fps = 0.0f;
1013	double elapsed_seconds_spawn = 0.0f;
1014	double previous_seconds = glfwGetTime();
1015
1016	// This draws wireframes. Useful for seeing separate faces and occluded objects.
1017	//glPolygonMode(GL_FRONT, GL_LINE);
1018
1019	if (DISABLE_VSYNC && SHOW_FPS) {
1020	glfwSwapInterval(0);
1021	}
1022
1023	State curState = STATE_MAIN_MENU;
1024
1025	while (!glfwWindowShouldClose(window) && isRunning) {
1026	double current_seconds = glfwGetTime();
1027	double elapsed_seconds = current_seconds - previous_seconds;
1028	previous_seconds = current_seconds;
1029
1030	if (SHOW_FPS) {
1031	elapsed_seconds_fps += elapsed_seconds;
1032	if (elapsed_seconds_fps > 0.25f) {
1033	fps = (double)frame_count / elapsed_seconds_fps;
1034	cout << "FPS: " << fps << endl;
1035
1036	frame_count = 0;
1037	elapsed_seconds_fps = 0.0f;
1038	}
1039
1040	frame_count++;
1041	}
1042
1043	// Handle events
1044
1045	clickedObject = NULL;
1046
1047	// reset the all key states to KEY_STATE_UNCHANGED (something the GLFW key callback can never return)
1048	// so that GLFW_PRESS and GLFW_RELEASE are only detected once
1049	// TODO: Change this if we ever need to act on GLFW_REPEAT (which is when a key is held down
1050	// continuously for a period of time)
1051	fill(key_state, key_state + NUM_KEYS, KEY_STATE_UNCHANGED);
1052
1053	glfwPollEvents();
1054
1055	while (!events.empty()) {
1056	switch (events.front()) {
1057	case EVENT_GO_TO_MAIN_MENU:
1058	curState = STATE_MAIN_MENU;
1059	break;
1060	case EVENT_GO_TO_GAME:
1061	curState = STATE_GAME;
1062	break;
1063	case EVENT_QUIT:
1064	isRunning = false;
1065	break;
1066	}
1067	events.pop();
1068	}
1069
1070	if (curState == STATE_GAME) {
1071
1072	elapsed_seconds_spawn += elapsed_seconds;
1073	if (elapsed_seconds_spawn > 0.5f) {
1074	spawnAsteroid(vec3(getRandomNum(-1.3f, 1.3f), getRandomNum(-3.0f, -1.0f), getRandomNum(-5.5f, -4.5f)), color_sp,
1075	shaderBufferInfo,
1076	points_vbo,
1077	colors_vbo,
1078	selected_colors_vbo,
1079	texcoords_vbo,
1080	normals_vbo,
1081	ubo,
1082	model_mat_idx_vbo);
1083
1084	elapsed_seconds_spawn -= 0.5f;
1085	}
1086
1087	/*
1088	if (clickedObject == &objects[0]) {
1089	selectedObject = &objects[0];
1090	}
1091	if (clickedObject == &objects[1]) {
1092	selectedObject = &objects[1];
1093	}
1094	*/
1095
1096	/*
1097	if (key_state[GLFW_KEY_SPACE] == GLFW_PRESS) {
1098	transformObject(objects[1], translate(mat4(1.0f), vec3(0.3f, 0.0f, 0.0f)), ubo);
1099	}
1100	if (key_pressed[GLFW_KEY_RIGHT]) {
1101	transformObject(objects[2], translate(mat4(1.0f), vec3(0.01f, 0.0f, 0.0f)), ubo);
1102	}
1103	if (key_pressed[GLFW_KEY_LEFT]) {
1104	transformObject(objects[2], translate(mat4(1.0f), vec3(-0.01f, 0.0f, 0.0f)), ubo);
1105	}
1106	*/
1107
1108	if (key_pressed[GLFW_KEY_RIGHT]) {
1109	transformObject(objects[0], translate(mat4(1.0f), vec3(0.01f, 0.0f, 0.0f)), ubo);
1110	}
1111	if (key_pressed[GLFW_KEY_LEFT]) {
1112	transformObject(objects[0], translate(mat4(1.0f), vec3(-0.01f, 0.0f, 0.0f)), ubo);
1113	}
1114
1115	// this code moves the asteroids
1116	for (int i = 0; i < objects.size(); i++) {
1117	if (objects[i].type == TYPE_ASTEROID && !objects[i].deleted) {
1118	transformObject(objects[i], translate(mat4(1.0f), vec3(0.0f, 0.0f, 0.04f)), ubo);
1119
1120	vec3 obj_center = vec3(view_mat * vec4(objects[i].bounding_center, 1.0f));
1121
1122	if ((obj_center.z - objects[i].bounding_radius) > -NEAR_CLIP) {
1123	removeObjectFromScene(objects[i], ubo);
1124	}
1125	}
1126	}
1127
1128	if (key_state[GLFW_KEY_SPACE] == GLFW_PRESS) {
1129	removeObjectFromScene(objects[0], ubo);
1130	}
1131	}
1132
1133	if (key_state[GLFW_KEY_ESCAPE] == GLFW_PRESS) {
1134	glfwSetWindowShouldClose(window, 1);
1135	}
1136
1137	float dist = cam_speed * elapsed_seconds;
1138	if (key_pressed[GLFW_KEY_A]) {
1139	vec3 dir = vec3(inverse(R) * vec4(-1.0f, 0.0f, 0.0f, 1.0f));
1140	cam_pos += dir * dist;
1141
1142	cam_moved = true;
1143	}
1144	if (key_pressed[GLFW_KEY_D]) {
1145	vec3 dir = vec3(inverse(R) * vec4(1.0f, 0.0f, 0.0f, 1.0f));
1146	cam_pos += dir * dist;
1147
1148	cam_moved = true;
1149	}
1150	if (key_pressed[GLFW_KEY_W]) {
1151	vec3 dir = vec3(inverse(R) * vec4(0.0f, 0.0f, -1.0f, 1.0f));
1152	cam_pos += dir * dist;
1153
1154	cam_moved = true;
1155	}
1156	if (key_pressed[GLFW_KEY_S]) {
1157	vec3 dir = vec3(inverse(R) * vec4(0.0f, 0.0f, 1.0f, 1.0f));
1158	cam_pos += dir * dist;
1159
1160	cam_moved = true;
1161	}
1162	/*
1163	if (key_pressed[GLFW_KEY_LEFT]) {
1164	cam_yaw += cam_yaw_speed * elapsed_seconds;
1165	cam_moved = true;
1166	}
1167	if (key_pressed[GLFW_KEY_RIGHT]) {
1168	cam_yaw -= cam_yaw_speed * elapsed_seconds;
1169	cam_moved = true;
1170	}
1171	if (key_pressed[GLFW_KEY_UP]) {
1172	cam_pitch += cam_pitch_speed * elapsed_seconds;
1173	cam_moved = true;
1174	}
1175	if (key_pressed[GLFW_KEY_DOWN]) {
1176	cam_pitch -= cam_pitch_speed * elapsed_seconds;
1177	cam_moved = true;
1178	}
1179	*/
1180	if (cam_moved) {
1181	T = translate(mat4(1.0f), vec3(-cam_pos.x, -cam_pos.y, -cam_pos.z));
1182
1183	mat4 yaw_mat = rotate(mat4(1.0f), -cam_yaw, vec3(0.0f, 1.0f, 0.0f));
1184	mat4 pitch_mat = rotate(mat4(1.0f), -cam_pitch, vec3(1.0f, 0.0f, 0.0f));
1185	R = pitch_mat * yaw_mat;
1186
1187	view_mat = R * T;
1188
1189	//printVector("cam pos", cam_pos);
1190
1191	glUseProgram(color_sp);
1192	glUniformMatrix4fv(view_test_loc, 1, GL_FALSE, value_ptr(view_mat));
1193
1194	glUseProgram(texture_sp);
1195	glUniformMatrix4fv(view_mat_loc, 1, GL_FALSE, value_ptr(view_mat));
1196
1197	glUseProgram(laser_sp);
1198	glUniformMatrix4fv(laser_view_mat_loc, 1, GL_FALSE, value_ptr(view_mat));
1199
1200	cam_moved = false;
1201	}
1202
1203	// Render scene
1204
1205	glClear(GL_COLOR_BUFFER_BIT \| GL_DEPTH_BUFFER_BIT);
1206
1207	switch (curState) {
1208	case STATE_MAIN_MENU:
1209	renderMainMenu();
1210	renderMainMenuGui();
1211	break;
1212	case STATE_GAME:
1213	renderScene(shaderBufferInfo,
1214	color_sp, texture_sp, laser_sp,
1215	color_vao, texture_vao, laser_vao,
1216	colors_vbo, selected_colors_vbo,
1217	selectedObject);
1218	renderSceneGui();
1219	break;
1220	}
1221
1222	glfwSwapBuffers(window);
1223	}
1224
1225	ImGui_ImplGlfwGL3_Shutdown();
1226	ImGui::DestroyContext();
1227
1228	glfwDestroyWindow(window);
1229	glfwTerminate();
1230
1231	return 0;
1232	}
1233
1234	void glfw_error_callback(int error, const char* description) {
1235	gl_log_err("GLFW ERROR: code %i msg: %s\n", error, description);
1236	}
1237
1238	void mouse_button_callback(GLFWwindow* window, int button, int action, int mods) {
1239	double mouse_x, mouse_y;
1240	glfwGetCursorPos(window, &mouse_x, &mouse_y);
1241
1242	if (button == GLFW_MOUSE_BUTTON_LEFT && action == GLFW_PRESS) {
1243	cout << "Mouse clicked (" << mouse_x << "," << mouse_y << ")" << endl;
1244	selectedObject = NULL;
1245
1246	float x = (2.0f*mouse_x) / width - 1.0f;
1247	float y = 1.0f - (2.0f*mouse_y) / height;
1248
1249	cout << "x: " << x << ", y: " << y << endl;
1250
1251	vec4 ray_clip = vec4(x, y, -1.0f, 1.0f);
1252	vec4 ray_eye = inverse(proj_mat) * ray_clip;
1253	ray_eye = vec4(vec2(ray_eye), -1.0f, 1.0f);
1254	vec4 ray_world = inverse(view_mat) * ray_eye;
1255
1256	vec4 click_point;
1257	vec3 closest_point = vec3(0.0f, 0.0f, -FAR_CLIP); // Any valid point will be closer than the far clipping plane, so initial value to that
1258	SceneObject* closest_object = NULL;
1259
1260	for (vector<SceneObject>::iterator it = objects.begin(); it != objects.end(); it++) {
1261	if (it->type == TYPE_LASER) continue;
1262	for (unsigned int p_idx = 0; p_idx < it->points.size(); p_idx += 9) {
1263	if (faceClicked(
1264	{
1265	vec3(it->points[p_idx], it->points[p_idx + 1], it->points[p_idx + 2]),
1266	vec3(it->points[p_idx + 3], it->points[p_idx + 4], it->points[p_idx + 5]),
1267	vec3(it->points[p_idx + 6], it->points[p_idx + 7], it->points[p_idx + 8]),
1268	},
1269	&*it, ray_world, vec4(cam_pos, 1.0f), click_point
1270	)) {
1271	click_point = view_mat * click_point;
1272
1273	if (-NEAR_CLIP >= click_point.z && click_point.z > -FAR_CLIP && click_point.z > closest_point.z) {
1274	closest_point = vec3(click_point);
1275	closest_object = &*it;
1276	}
1277	}
1278	}
1279	}
1280
1281	if (closest_object == NULL) {
1282	cout << "No object was clicked" << endl;
1283	} else {
1284	clickedObject = closest_object;
1285	cout << "Clicked object: " << clickedObject->id << endl;
1286	}
1287	}
1288	}
1289
1290	void key_callback(GLFWwindow* window, int key, int scancode, int action, int mods) {
1291	key_state[key] = action;
1292
1293	// should be true for GLFW_PRESS and GLFW_REPEAT
1294	key_pressed[key] = (action != GLFW_RELEASE);
1295	}
1296
1297
1298	GLuint loadShader(GLenum type, string file) {
1299	cout << "Loading shader from file " << file << endl;
1300
1301	ifstream shaderFile(file);
1302	GLuint shaderId = 0;
1303
1304	if (shaderFile.is_open()) {
1305	string line, shaderString;
1306
1307	while(getline(shaderFile, line)) {
1308	shaderString += line + "\n";
1309	}
1310	shaderFile.close();
1311	const char* shaderCString = shaderString.c_str();
1312
1313	shaderId = glCreateShader(type);
1314	glShaderSource(shaderId, 1, &shaderCString, NULL);
1315	glCompileShader(shaderId);
1316
1317	cout << "Loaded successfully" << endl;
1318	} else {
1319	cout << "Failed to load the file" << endl;
1320	}
1321
1322	return shaderId;
1323	}
1324
1325	GLuint loadShaderProgram(string vertexShaderPath, string fragmentShaderPath) {
1326	GLuint vs = loadShader(GL_VERTEX_SHADER, vertexShaderPath);
1327	GLuint fs = loadShader(GL_FRAGMENT_SHADER, fragmentShaderPath);
1328
1329	GLuint shader_program = glCreateProgram();
1330	glAttachShader(shader_program, vs);
1331	glAttachShader(shader_program, fs);
1332
1333	glLinkProgram(shader_program);
1334
1335	return shader_program;
1336	}
1337
1338	unsigned char* loadImage(string file_name, int* x, int* y) {
1339	int n;
1340	int force_channels = 4; // This forces RGBA (4 bytes per pixel)
1341	unsigned char* image_data = stbi_load(file_name.c_str(), x, y, &n, force_channels);
1342
1343	int width_in_bytes = x 4;
1344	unsigned char *top = NULL;
1345	unsigned char *bottom = NULL;
1346	unsigned char temp = 0;
1347	int half_height = *y / 2;
1348
1349	// flip image upside-down to account for OpenGL treating lower-left as (0, 0)
1350	for (int row = 0; row < half_height; row++) {
1351	top = image_data + row * width_in_bytes;
1352	bottom = image_data + (y - row - 1) width_in_bytes;
1353	for (int col = 0; col < width_in_bytes; col++) {
1354	temp = *top;
1355	top = bottom;
1356	*bottom = temp;
1357	top++;
1358	bottom++;
1359	}
1360	}
1361
1362	if (!image_data) {
1363	fprintf(stderr, "ERROR: could not load %s\n", file_name.c_str());
1364	}
1365
1366	// Not Power-of-2 check
1367	if ((x & (x - 1)) != 0 \|\| (y & (y - 1)) != 0) {
1368	fprintf(stderr, "WARNING: texture %s is not power-of-2 dimensions\n", file_name.c_str());
1369	}
1370
1371	return image_data;
1372	}
1373
1374	bool faceClicked(array<vec3, 3> points, SceneObject* obj, vec4 world_ray, vec4 cam, vec4& click_point) {
1375	// LINE EQUATION: P = O + Dt
1376	// O = cam
1377	// D = ray_world
1378
1379	// PLANE EQUATION: P dot n + d = 0
1380	// n is the normal vector
1381	// d is the offset from the origin
1382
1383	// Take the cross-product of two vectors on the plane to get the normal
1384	vec3 v1 = points[1] - points[0];
1385	vec3 v2 = points[2] - points[0];
1386
1387	vec3 normal = vec3(v1.yv2.z - v1.zv2.y, v1.zv2.x - v1.xv2.z, v1.xv2.y - v1.yv2.x);
1388
1389	vec3 local_ray = vec3(inverse(obj->model_mat) * world_ray);
1390	vec3 local_cam = vec3(inverse(obj->model_mat) * cam);
1391
1392	local_ray = local_ray - local_cam;
1393
1394	float d = -glm::dot(points[0], normal);
1395	float t = -(glm::dot(local_cam, normal) + d) / glm::dot(local_ray, normal);
1396
1397	vec3 intersection = local_cam + t*local_ray;
1398
1399	if (insideTriangle(intersection, points)) {
1400	click_point = obj->model_mat * vec4(intersection, 1.0f);
1401	return true;
1402	} else {
1403	return false;
1404	}
1405	}
1406
1407	bool insideTriangle(vec3 p, array<vec3, 3> triangle_points) {
1408	vec3 v21 = triangle_points[1] - triangle_points[0];
1409	vec3 v31 = triangle_points[2] - triangle_points[0];
1410	vec3 pv1 = p - triangle_points[0];
1411
1412	float y = (pv1.yv21.x - pv1.xv21.y) / (v31.yv21.x - v31.xv21.y);
1413	float x = (pv1.x-y*v31.x) / v21.x;
1414
1415	return x > 0.0f && y > 0.0f && x+y < 1.0f;
1416	}
1417
1418	void printVector(string label, vec3 v) {
1419	cout << label << " -> (" << v.x << "," << v.y << "," << v.z << ")" << endl;
1420	}
1421
1422	void print4DVector(string label, vec4 v) {
1423	cout << label << " -> (" << v.x << "," << v.y << "," << v.z << "," << v.w << ")" << endl;
1424	}
1425
1426	void addObjectToSceneDuringInit(SceneObject& obj) {
1427	// Each objects must have at least 3 points, so the size of
1428	// the points array must be a positive multiple of 9
1429	if (obj.points.size() == 0 \|\| (obj.points.size() % 9) != 0) {
1430	return;
1431	}
1432
1433	obj.id = objects.size(); // currently unused
1434	obj.num_points = obj.points.size() / 3;
1435	obj.model_transform = mat4(1.0f);
1436	obj.deleted = false;
1437
1438	obj.normals.reserve(obj.points.size());
1439	for (int i = 0; i < obj.points.size(); i += 9) {
1440	vec3 point1 = vec3(obj.points[i], obj.points[i + 1], obj.points[i + 2]);
1441	vec3 point2 = vec3(obj.points[i + 3], obj.points[i + 4], obj.points[i + 5]);
1442	vec3 point3 = vec3(obj.points[i + 6], obj.points[i + 7], obj.points[i + 8]);
1443
1444	vec3 normal = normalize(cross(point2 - point1, point3 - point1));
1445
1446	// Add the same normal for all 3 points
1447	for (int j = 0; j < 3; j++) {
1448	obj.normals.push_back(normal.x);
1449	obj.normals.push_back(normal.y);
1450	obj.normals.push_back(normal.z);
1451	}
1452	}
1453
1454	calculateObjectBoundingBox(obj);
1455
1456	obj.bounding_center = vec3(obj.translate_mat * vec4(obj.bounding_center, 1.0f));
1457
1458	objects.push_back(obj);
1459	}
1460
1461	void addObjectToScene(SceneObject& obj,
1462	map<GLuint, BufferInfo>& shaderBufferInfo,
1463	GLuint points_vbo,
1464	GLuint colors_vbo,
1465	GLuint selected_colors_vbo,
1466	GLuint texcoords_vbo,
1467	GLuint normals_vbo,
1468	GLuint ubo,
1469	GLuint model_mat_idx_vbo) {
1470	addObjectToSceneDuringInit(obj);
1471
1472	BufferInfo* bufferInfo = &shaderBufferInfo[obj.shader_program];
1473
1474	// Check if the buffers aren't large enough to fit the new object and, if so, call
1475	// populateBuffers() to resize and repopupulate them
1476	if (bufferInfo->vbo_capacity < (bufferInfo->ubo_offset + obj.num_points) \|\|
1477	bufferInfo->ubo_capacity < (bufferInfo->ubo_offset + 1)) {
1478	populateBuffers(objects, shaderBufferInfo,
1479	points_vbo,
1480	colors_vbo,
1481	selected_colors_vbo,
1482	texcoords_vbo,
1483	normals_vbo,
1484	ubo,
1485	model_mat_idx_vbo);
1486	} else {
1487	copyObjectDataToBuffers(objects.back(), shaderBufferInfo,
1488	points_vbo,
1489	colors_vbo,
1490	selected_colors_vbo,
1491	texcoords_vbo,
1492	normals_vbo,
1493	ubo,
1494	model_mat_idx_vbo);
1495	}
1496	}
1497
1498	void removeObjectFromScene(SceneObject& obj, GLuint ubo) {
1499	if (!obj.deleted) {
1500	// Move the object outside the render bounds of the scene so it doesn't get rendered
1501	// TODO: Find a better way of hiding the object until the next time buffers are repopulated
1502	transformObject(obj, translate(mat4(1.0f), vec3(0.0f, 0.0f, FAR_CLIP * 1000.0f)), ubo);
1503	obj.deleted = true;
1504	}
1505	}
1506
1507	void calculateObjectBoundingBox(SceneObject& obj) {
1508	GLfloat min_x = obj.points[0];
1509	GLfloat max_x = obj.points[0];
1510	GLfloat min_y = obj.points[1];
1511	GLfloat max_y = obj.points[1];
1512	GLfloat min_z = obj.points[2];
1513	GLfloat max_z = obj.points[2];
1514
1515	// start from the second point
1516	for (int i = 3; i < obj.points.size(); i += 3) {
1517	if (min_x > obj.points[i]) {
1518	min_x = obj.points[i];
1519	}
1520	else if (max_x < obj.points[i]) {
1521	max_x = obj.points[i];
1522	}
1523
1524	if (min_y > obj.points[i + 1]) {
1525	min_y = obj.points[i + 1];
1526	}
1527	else if (max_y < obj.points[i + 1]) {
1528	max_y = obj.points[i + 1];
1529	}
1530
1531	if (min_z > obj.points[i + 2]) {
1532	min_z = obj.points[i + 2];
1533	}
1534	else if (max_z < obj.points[i + 2]) {
1535	max_z = obj.points[i + 2];
1536	}
1537	}
1538
1539	obj.bounding_center = vec3((min_x + max_x) / 2.0f, (min_y + max_y) / 2.0f, (min_z + max_z) / 2.0f);
1540
1541	GLfloat radius_x = max_x - obj.bounding_center.x;
1542	GLfloat radius_y = max_y - obj.bounding_center.y;
1543	GLfloat radius_z = max_z - obj.bounding_center.z;
1544
1545	// This actually underestimates the radius. Might need to be fixed at some point.
1546	obj.bounding_radius = radius_x;
1547	if (obj.bounding_radius < radius_y)
1548	obj.bounding_radius = radius_y;
1549	if (obj.bounding_radius < radius_z)
1550	obj.bounding_radius = radius_z;
1551
1552	for (int i = 0; i < obj.points.size(); i += 3) {
1553	obj.points[i] -= obj.bounding_center.x;
1554	obj.points[i + 1] -= obj.bounding_center.y;
1555	obj.points[i + 2] -= obj.bounding_center.z;
1556	}
1557
1558	obj.bounding_center = vec3(0.0f, 0.0f, 0.0f);
1559	}
1560
1561	/* LASER RENDERING/POSITIONING ALGORITHM
1562	* -Draw a thin rectangle for the laser beam, using the specified width and endpoints
1563	* -Texture the beam with a grayscale partially transparent image
1564	* -In the shader, blend the image with a color to support lasers of different colors
1565	*
1566	* The flat part of the textured rectangle needs to always face the camera, so the laser's width is constant
1567	* This is done as follows:
1568	* -Determine the length of the laser based on the start and end points
1569	* -Draw a rectangle along the z-axis and rotated upwards along the y-axis, with the correct final length and width
1570	* -Rotate the beam around the z-axis by the correct angle, sot that in its final position, the flat part faces the camera
1571	* -Rotate the beam along the x-axis and then along the y-axis and then translate it to put it into its final position
1572	*/
1573	void addLaserToScene(vec3 start, vec3 end, vec3 color, GLfloat width, GLuint laser_sp) {
1574	SceneObject obj = SceneObject();
1575	obj.id = objects.size(); // currently unused
1576	obj.type = TYPE_LASER;
1577	obj.shader_program = laser_sp;
1578	obj.deleted = false;
1579
1580	vec3 ray = end - start;
1581	float length = glm::length(ray);
1582
1583	obj.points = {
1584	width / 2, 0.0f, -width / 2,
1585	-width / 2, 0.0f, -width / 2,
1586	-width / 2, 0.0f, 0.0f,
1587	width / 2, 0.0f, -width / 2,
1588	-width / 2, 0.0f, 0.0f,
1589	width / 2, 0.0f, 0.0f,
1590	width / 2, 0.0f, -length + width / 2,
1591	-width / 2, 0.0f, -length + width / 2,
1592	-width / 2, 0.0f, -width / 2,
1593	width / 2, 0.0f, -length + width / 2,
1594	-width / 2, 0.0f, -width / 2,
1595	width / 2, 0.0f, -width / 2,
1596	width / 2, 0.0f, -length,
1597	-width / 2, 0.0f, -length,
1598	-width / 2, 0.0f, -length + width / 2,
1599	width / 2, 0.0f, -length,
1600	-width / 2, 0.0f, -length + width / 2,
1601	width / 2, 0.0f, -length + width / 2,
1602	};
1603
1604	obj.texcoords = {
1605	1.0f, 0.5f,
1606	0.0f, 0.5f,
1607	0.0f, 0.0f,
1608	1.0f, 0.5f,
1609	0.0f, 0.0f,
1610	1.0f, 0.0f,
1611	1.0f, 0.51f,
1612	0.0f, 0.51f,
1613	0.0f, 0.49f,
1614	1.0f, 0.51f,
1615	0.0f, 0.49f,
1616	1.0f, 0.49f,
1617	1.0f, 1.0f,
1618	0.0f, 1.0f,
1619	0.0f, 0.5f,
1620	1.0f, 1.0f,
1621	0.0f, 0.5f,
1622	1.0f, 0.5f,
1623	};
1624
1625	obj.num_points = obj.points.size() / 3;
1626
1627	float xAxisRotation = asin(ray.y / length);
1628	float yAxisRotation = atan2(-ray.x, -ray.z);
1629
1630	vec3 normal(rotate(mat4(1.0f), yAxisRotation, vec3(0.0f, 1.0f, 0.0f)) *
1631	rotate(mat4(1.0f), xAxisRotation, vec3(1.0f, 0.0f, 0.0f)) *
1632	vec4(0.0f, 1.0f, 0.0f, 1.0f));
1633
1634	// To project point P onto line AB:
1635	// projection = A + dot(AP,AB) / dot(AB,AB) * AB
1636	vec3 projOnLaser = start + glm::dot(cam_pos-start, ray) / (lengthlength) ray;
1637	vec3 laserToCam = cam_pos - projOnLaser;
1638
1639	float zAxisRotation = -atan2(glm::dot(glm::cross(normal, laserToCam), glm::normalize(ray)), glm::dot(normal, laserToCam));
1640
1641	obj.model_base = mat4(1.0f);
1642	obj.model_base = rotate(mat4(1.0f), zAxisRotation, vec3(0.0f, 0.0f, 1.0f)) * obj.model_base;
1643	obj.model_base = rotate(mat4(1.0f), xAxisRotation, vec3(1.0f, 0.0f, 0.0f)) * obj.model_base;
1644	obj.model_base = rotate(mat4(1.0f), yAxisRotation, vec3(0.0f, 1.0f, 0.0f)) * obj.model_base;
1645	obj.model_base = translate(mat4(1.0f), start) * obj.model_base;
1646	obj.model_transform = mat4(1.0f);
1647
1648	objects.push_back(obj);
1649	}
1650
1651	void initializeBuffers(
1652	GLuint* points_vbo,
1653	GLuint* colors_vbo,
1654	GLuint* selected_colors_vbo,
1655	GLuint* texcoords_vbo,
1656	GLuint* normals_vbo,
1657	GLuint* ubo,
1658	GLuint* model_mat_idx_vbo) {
1659	*points_vbo = 0;
1660	glGenBuffers(1, points_vbo);
1661
1662	*colors_vbo = 0;
1663	glGenBuffers(1, colors_vbo);
1664
1665	*selected_colors_vbo = 0;
1666	glGenBuffers(1, selected_colors_vbo);
1667
1668	*texcoords_vbo = 0;
1669	glGenBuffers(1, texcoords_vbo);
1670
1671	*normals_vbo = 0;
1672	glGenBuffers(1, normals_vbo);
1673
1674	*ubo = 0;
1675	glGenBuffers(1, ubo);
1676
1677	*model_mat_idx_vbo = 0;
1678	glGenBuffers(1, model_mat_idx_vbo);
1679	}
1680
1681	void populateBuffers(vector<SceneObject>& objects,
1682	map<GLuint, BufferInfo>& shaderBufferInfo,
1683	GLuint points_vbo,
1684	GLuint colors_vbo,
1685	GLuint selected_colors_vbo,
1686	GLuint texcoords_vbo,
1687	GLuint normals_vbo,
1688	GLuint ubo,
1689	GLuint model_mat_idx_vbo) {
1690	GLsizeiptr points_buffer_size = 0;
1691	GLsizeiptr textures_buffer_size = 0;
1692	GLsizeiptr ubo_buffer_size = 0;
1693	GLsizeiptr model_mat_idx_buffer_size = 0;
1694
1695	map<GLuint, unsigned int> shaderCounts;
1696	map<GLuint, unsigned int> shaderUboCounts;
1697
1698	vector<SceneObject>::iterator it;
1699
1700	/* Find all shaders that need to be used and the number of objects and
1701	* number of points for each shader. Construct a map from shader id to count
1702	* of points being drawn using that shader (for thw model matrix ubo, we
1703	* need object counts instead). These will be used to get offsets into the
1704	* vertex buffer for each shader.
1705	*/
1706	for (it = objects.begin(); it != objects.end();) {
1707	if (it->deleted) {
1708	it = objects.erase(it);
1709	} else {
1710	points_buffer_size += it->num_points * sizeof(GLfloat) * 3;
1711	textures_buffer_size += it->num_points * sizeof(GLfloat) * 2;
1712	ubo_buffer_size += 16 * sizeof(GLfloat);
1713	model_mat_idx_buffer_size += it->num_points * sizeof(GLuint);
1714
1715	if (shaderCounts.count(it->shader_program) == 0) {
1716	shaderCounts[it->shader_program] = it->num_points;
1717	shaderUboCounts[it->shader_program] = 1;
1718	} else {
1719	shaderCounts[it->shader_program] += it->num_points;
1720	shaderUboCounts[it->shader_program]++;
1721	}
1722
1723	it++;
1724	}
1725	}
1726
1727	// double the buffer sizes to leave room for new objects
1728	points_buffer_size *= 2;
1729	textures_buffer_size *= 2;
1730	ubo_buffer_size *= 2;
1731	model_mat_idx_buffer_size *= 2;
1732
1733	map<GLuint, unsigned int>::iterator shaderIt;
1734	unsigned int lastShaderCount = 0;
1735	unsigned int lastShaderUboCount = 0;
1736
1737	/*
1738	* The counts calculated above can be used to get the starting offset of
1739	* each shader in the vertex buffer. Create a map of base offsets to mark
1740	* where the data for the first object using a given shader begins. Also,
1741	* create a map of current offsets to mark where to copy data for the next
1742	* object being added.
1743	*/
1744	for (shaderIt = shaderCounts.begin(); shaderIt != shaderCounts.end(); shaderIt++) {
1745	shaderBufferInfo[shaderIt->first].vbo_base = lastShaderCount * 2;
1746	shaderBufferInfo[shaderIt->first].ubo_base = lastShaderUboCount * 2;
1747
1748	/*
1749	cout << "shader: " << shaderIt->first << endl;
1750	cout << "point counts: " << shaderCounts[shaderIt->first] << endl;
1751	cout << "object counts: " << shaderUboCounts[shaderIt->first] << endl;
1752	cout << "vbo_base: " << shaderBufferInfo[shaderIt->first].vbo_base << endl;
1753	cout << "ubo_base: " << shaderBufferInfo[shaderIt->first].ubo_base << endl;
1754	*/
1755
1756	shaderBufferInfo[shaderIt->first].vbo_offset = 0;
1757	shaderBufferInfo[shaderIt->first].ubo_offset = 0;
1758
1759	shaderBufferInfo[shaderIt->first].vbo_capacity = shaderCounts[shaderIt->first] * 2;
1760	shaderBufferInfo[shaderIt->first].ubo_capacity = shaderUboCounts[shaderIt->first] * 2;
1761
1762	lastShaderCount += shaderCounts[shaderIt->first];
1763	lastShaderUboCount += shaderUboCounts[shaderIt->first];
1764	}
1765
1766	// Allocate all the buffers using the counts calculated above
1767
1768	glBindBuffer(GL_ARRAY_BUFFER, points_vbo);
1769	glBufferData(GL_ARRAY_BUFFER, points_buffer_size, NULL, GL_DYNAMIC_DRAW);
1770
1771	glBindBuffer(GL_ARRAY_BUFFER, colors_vbo);
1772	glBufferData(GL_ARRAY_BUFFER, points_buffer_size, NULL, GL_DYNAMIC_DRAW);
1773
1774	glBindBuffer(GL_ARRAY_BUFFER, selected_colors_vbo);
1775	glBufferData(GL_ARRAY_BUFFER, points_buffer_size, NULL, GL_DYNAMIC_DRAW);
1776
1777	glBindBuffer(GL_ARRAY_BUFFER, texcoords_vbo);
1778	glBufferData(GL_ARRAY_BUFFER, textures_buffer_size, NULL, GL_DYNAMIC_DRAW);
1779
1780	glBindBuffer(GL_ARRAY_BUFFER, normals_vbo);
1781	glBufferData(GL_ARRAY_BUFFER, points_buffer_size, NULL, GL_DYNAMIC_DRAW);
1782
1783	glBindBuffer(GL_UNIFORM_BUFFER, ubo);
1784	glBufferData(GL_UNIFORM_BUFFER, ubo_buffer_size, NULL, GL_DYNAMIC_DRAW);
1785
1786	glBindBuffer(GL_ARRAY_BUFFER, model_mat_idx_vbo);
1787	glBufferData(GL_ARRAY_BUFFER, model_mat_idx_buffer_size, NULL, GL_DYNAMIC_DRAW);
1788
1789	for (it = objects.begin(); it != objects.end(); it++) {
1790	copyObjectDataToBuffers(*it, shaderBufferInfo,
1791	points_vbo,
1792	colors_vbo,
1793	selected_colors_vbo,
1794	texcoords_vbo,
1795	normals_vbo,
1796	ubo,
1797	model_mat_idx_vbo);
1798	}
1799	}
1800
1801	void copyObjectDataToBuffers(SceneObject& obj,
1802	map<GLuint, BufferInfo>& shaderBufferInfo,
1803	GLuint points_vbo,
1804	GLuint colors_vbo,
1805	GLuint selected_colors_vbo,
1806	GLuint texcoords_vbo,
1807	GLuint normals_vbo,
1808	GLuint ubo,
1809	GLuint model_mat_idx_vbo) {
1810	BufferInfo* bufferInfo = &shaderBufferInfo[obj.shader_program];
1811
1812	obj.vertex_vbo_offset = bufferInfo->vbo_base + bufferInfo->vbo_offset;
1813	obj.ubo_offset = bufferInfo->ubo_base + bufferInfo->ubo_offset;
1814
1815	glBindBuffer(GL_ARRAY_BUFFER, points_vbo);
1816	glBufferSubData(GL_ARRAY_BUFFER, obj.vertex_vbo_offset * sizeof(GLfloat) * 3, obj.points.size() * sizeof(GLfloat), &obj.points[0]);
1817
1818	glBindBuffer(GL_ARRAY_BUFFER, texcoords_vbo);
1819	glBufferSubData(GL_ARRAY_BUFFER, obj.vertex_vbo_offset * sizeof(GLfloat) * 2, obj.texcoords.size() * sizeof(GLfloat), &obj.texcoords[0]);
1820
1821	glBindBuffer(GL_ARRAY_BUFFER, model_mat_idx_vbo);
1822	for (int i = 0; i < obj.num_points; i++) {
1823	glBufferSubData(GL_ARRAY_BUFFER, (obj.vertex_vbo_offset + i) * sizeof(GLuint), sizeof(GLuint), &obj.ubo_offset);
1824	}
1825
1826	if (obj.type != TYPE_LASER) {
1827	glBindBuffer(GL_ARRAY_BUFFER, colors_vbo);
1828	glBufferSubData(GL_ARRAY_BUFFER, obj.vertex_vbo_offset * sizeof(GLfloat) * 3, obj.colors.size() * sizeof(GLfloat), &obj.colors[0]);
1829
1830	glBindBuffer(GL_ARRAY_BUFFER, selected_colors_vbo);
1831	glBufferSubData(GL_ARRAY_BUFFER, obj.vertex_vbo_offset * sizeof(GLfloat) * 3, obj.selected_colors.size() * sizeof(GLfloat), &obj.selected_colors[0]);
1832
1833	glBindBuffer(GL_ARRAY_BUFFER, normals_vbo);
1834	glBufferSubData(GL_ARRAY_BUFFER, obj.vertex_vbo_offset * sizeof(GLfloat) * 3, obj.normals.size() * sizeof(GLfloat), &obj.normals[0]);
1835	}
1836
1837	obj.model_mat = obj.model_transform * obj.model_base;
1838	glBindBuffer(GL_UNIFORM_BUFFER, ubo);
1839	glBufferSubData(GL_UNIFORM_BUFFER, obj.ubo_offset * sizeof(mat4), sizeof(mat4), value_ptr(obj.model_mat));
1840
1841	bufferInfo->vbo_offset += obj.num_points;
1842	bufferInfo->ubo_offset++;
1843	}
1844
1845	void transformObject(SceneObject& obj, const mat4& transform, GLuint ubo) {
1846	obj.model_transform = transform * obj.model_transform;
1847	obj.model_mat = obj.model_transform * obj.model_base;
1848
1849	obj.bounding_center = vec3(transform * vec4(obj.bounding_center, 1.0f));
1850
1851	glBindBuffer(GL_UNIFORM_BUFFER, ubo);
1852	glBufferSubData(GL_UNIFORM_BUFFER, obj.ubo_offset * sizeof(mat4), sizeof(mat4), value_ptr(obj.model_mat));
1853	}
1854
1855	void renderScene(map<GLuint, BufferInfo>& shaderBufferInfo,
1856	GLuint color_sp, GLuint texture_sp, GLuint laser_sp,
1857	GLuint color_vao, GLuint texture_vao, GLuint laser_vao,
1858	GLuint colors_vbo, GLuint selected_colors_vbo,
1859	SceneObject* selectedObject) {
1860
1861	glUseProgram(color_sp);
1862	glBindVertexArray(color_vao);
1863
1864	if (selectedObject != NULL) {
1865	glBindBuffer(GL_ARRAY_BUFFER, selected_colors_vbo);
1866	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, 0);
1867
1868	glDrawArrays(GL_TRIANGLES, selectedObject->vertex_vbo_offset, selectedObject->num_points);
1869	}
1870
1871	glBindBuffer(GL_ARRAY_BUFFER, colors_vbo);
1872	glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, 0, 0);
1873
1874	glDrawArrays(GL_TRIANGLES, shaderBufferInfo[color_sp].vbo_base, shaderBufferInfo[color_sp].vbo_offset);
1875
1876	glUseProgram(texture_sp);
1877	glBindVertexArray(texture_vao);
1878
1879	glDrawArrays(GL_TRIANGLES, shaderBufferInfo[texture_sp].vbo_base, shaderBufferInfo[texture_sp].vbo_offset);
1880
1881	glEnable(GL_BLEND);
1882
1883	glUseProgram(laser_sp);
1884	glBindVertexArray(laser_vao);
1885
1886	glDrawArrays(GL_TRIANGLES, shaderBufferInfo[laser_sp].vbo_base, shaderBufferInfo[laser_sp].vbo_offset);
1887
1888	glDisable(GL_BLEND);
1889	}
1890
1891	void renderSceneGui() {
1892	ImGui_ImplGlfwGL3_NewFrame();
1893
1894	// 1. Show a simple window.
1895	// Tip: if we don't call ImGui::Begin()/ImGui::End() the widgets automatically appears in a window called "Debug".
1896	/*
1897	{
1898	static float f = 0.0f;
1899	static int counter = 0;
1900	ImGui::Text("Hello, world!"); // Display some text (you can use a format string too)
1901	ImGui::SliderFloat("float", &f, 0.0f, 1.0f); // Edit 1 float using a slider from 0.0f to 1.0f
1902	ImGui::ColorEdit3("clear color", (float*)&clear_color); // Edit 3 floats representing a color
1903
1904	ImGui::Checkbox("Demo Window", &show_demo_window); // Edit bools storing our windows open/close state
1905	ImGui::Checkbox("Another Window", &show_another_window);
1906
1907	if (ImGui::Button("Button")) // Buttons return true when clicked (NB: most widgets return true when edited/activated)
1908	counter++;
1909	ImGui::SameLine();
1910	ImGui::Text("counter = %d", counter);
1911
1912	ImGui::Text("Application average %.3f ms/frame (%.1f FPS)", 1000.0f / ImGui::GetIO().Framerate, ImGui::GetIO().Framerate);
1913	}
1914	*/
1915
1916	{
1917	ImGui::SetNextWindowSize(ImVec2(85, 22), ImGuiCond_Once);
1918	ImGui::SetNextWindowPos(ImVec2(10, 50), ImGuiCond_Once);
1919	ImGui::Begin("WndStats", NULL,
1920	ImGuiWindowFlags_NoTitleBar \|
1921	ImGuiWindowFlags_NoResize \|
1922	ImGuiWindowFlags_NoMove);
1923	ImGui::Text("Score: ???");
1924	ImGui::End();
1925	}
1926
1927	{
1928	ImGui::SetNextWindowPos(ImVec2(380, 10), ImGuiCond_Once);
1929	ImGui::SetNextWindowSize(ImVec2(250, 35), ImGuiCond_Once);
1930	ImGui::Begin("WndMenubar", NULL,
1931	ImGuiWindowFlags_NoTitleBar \|
1932	ImGuiWindowFlags_NoResize \|
1933	ImGuiWindowFlags_NoMove);
1934	ImGui::InvisibleButton("", ImVec2(155, 18));
1935	ImGui::SameLine();
1936	if (ImGui::Button("Main Menu")) {
1937	events.push(EVENT_GO_TO_MAIN_MENU);
1938	}
1939	ImGui::End();
1940	}
1941
1942	ImGui::Render();
1943	ImGui_ImplGlfwGL3_RenderDrawData(ImGui::GetDrawData());
1944	}
1945
1946	void renderMainMenu() {
1947	}
1948
1949	void renderMainMenuGui() {
1950	ImGui_ImplGlfwGL3_NewFrame();
1951
1952	{
1953	int padding = 4;
1954	ImGui::SetNextWindowPos(ImVec2(-padding, -padding), ImGuiCond_Once);
1955	ImGui::SetNextWindowSize(ImVec2(width + 2 * padding, height + 2 * padding), ImGuiCond_Once);
1956	ImGui::Begin("WndMain", NULL,
1957	ImGuiWindowFlags_NoTitleBar \|
1958	ImGuiWindowFlags_NoResize \|
1959	ImGuiWindowFlags_NoMove);
1960
1961	ImGui::InvisibleButton("", ImVec2(10, 80));
1962	ImGui::InvisibleButton("", ImVec2(285, 18));
1963	ImGui::SameLine();
1964	if (ImGui::Button("New Game")) {
1965	events.push(EVENT_GO_TO_GAME);
1966	}
1967
1968	ImGui::InvisibleButton("", ImVec2(10, 15));
1969	ImGui::InvisibleButton("", ImVec2(300, 18));
1970	ImGui::SameLine();
1971	if (ImGui::Button("Quit")) {
1972	events.push(EVENT_QUIT);
1973	}
1974
1975	ImGui::End();
1976	}
1977
1978	ImGui::Render();
1979	ImGui_ImplGlfwGL3_RenderDrawData(ImGui::GetDrawData());
1980	}
1981
1982	void spawnAsteroid(vec3 pos, GLuint shader,
1983	map<GLuint, BufferInfo>& shaderBufferInfo,
1984	GLuint points_vbo,
1985	GLuint colors_vbo,
1986	GLuint selected_colors_vbo,
1987	GLuint texcoords_vbo,
1988	GLuint normals_vbo,
1989	GLuint ubo,
1990	GLuint model_mat_idx_vbo) {
1991	SceneObject obj = SceneObject();
1992	obj.type = TYPE_ASTEROID;
1993	obj.shader_program = shader;
1994
1995	obj.points = {
1996	// front
1997	1.0f, 1.0f, 1.0f,
1998	-1.0f, 1.0f, 1.0f,
1999	-1.0f, -1.0f, 1.0f,
2000	1.0f, 1.0f, 1.0f,
2001	-1.0f, -1.0f, 1.0f,
2002	1.0f, -1.0f, 1.0f,
2003
2004	// top
2005	1.0f, 1.0f, -1.0f,
2006	-1.0f, 1.0f, -1.0f,
2007	-1.0f, 1.0f, 1.0f,
2008	1.0f, 1.0f, -1.0f,
2009	-1.0f, 1.0f, 1.0f,
2010	1.0f, 1.0f, 1.0f,
2011
2012	// bottom
2013	1.0f, -1.0f, 1.0f,
2014	-1.0f, -1.0f, 1.0f,
2015	-1.0f, -1.0f, -1.0f,
2016	1.0f, -1.0f, 1.0f,
2017	-1.0f, -1.0f, -1.0f,
2018	1.0f, -1.0f, -1.0f,
2019
2020	// back
2021	1.0f, 1.0f, -1.0f,
2022	-1.0f, -1.0f, -1.0f,
2023	-1.0f, 1.0f, -1.0f,
2024	1.0f, 1.0f, -1.0f,
2025	1.0f, -1.0f, -1.0f,
2026	-1.0f, -1.0f, -1.0f,
2027
2028	// right
2029	1.0f, 1.0f, -1.0f,
2030	1.0f, 1.0f, 1.0f,
2031	1.0f, -1.0f, 1.0f,
2032	1.0f, 1.0f, -1.0f,
2033	1.0f, -1.0f, 1.0f,
2034	1.0f, -1.0f, -1.0f,
2035
2036	// left
2037	-1.0f, 1.0f, 1.0f,
2038	-1.0f, 1.0f, -1.0f,
2039	-1.0f, -1.0f, -1.0f,
2040	-1.0f, 1.0f, 1.0f,
2041	-1.0f, -1.0f, -1.0f,
2042	-1.0f, -1.0f, 1.0f,
2043	};
2044	obj.colors = {
2045	// front
2046	0.8f, 0.0f, 0.0f,
2047	0.8f, 0.0f, 0.0f,
2048	0.8f, 0.0f, 0.0f,
2049	0.8f, 0.0f, 0.0f,
2050	0.8f, 0.0f, 0.0f,
2051	0.8f, 0.0f, 0.0f,
2052
2053	// top
2054	0.8f, 0.0f, 0.0f,
2055	0.8f, 0.0f, 0.0f,
2056	0.8f, 0.0f, 0.0f,
2057	0.8f, 0.0f, 0.0f,
2058	0.8f, 0.0f, 0.0f,
2059	0.8f, 0.0f, 0.0f,
2060
2061	// bottom
2062	0.8f, 0.0f, 0.0f,
2063	0.8f, 0.0f, 0.0f,
2064	0.8f, 0.0f, 0.0f,
2065	0.8f, 0.0f, 0.0f,
2066	0.8f, 0.0f, 0.0f,
2067	0.8f, 0.0f, 0.0f,
2068
2069	// back
2070	0.8f, 0.0f, 0.0f,
2071	0.8f, 0.0f, 0.0f,
2072	0.8f, 0.0f, 0.0f,
2073	0.8f, 0.0f, 0.0f,
2074	0.8f, 0.0f, 0.0f,
2075	0.8f, 0.0f, 0.0f,
2076
2077	// right
2078	0.8f, 0.0f, 0.0f,
2079	0.8f, 0.0f, 0.0f,
2080	0.8f, 0.0f, 0.0f,
2081	0.8f, 0.0f, 0.0f,
2082	0.8f, 0.0f, 0.0f,
2083	0.8f, 0.0f, 0.0f,
2084
2085	// left
2086	0.8f, 0.0f, 0.0f,
2087	0.8f, 0.0f, 0.0f,
2088	0.8f, 0.0f, 0.0f,
2089	0.8f, 0.0f, 0.0f,
2090	0.8f, 0.0f, 0.0f,
2091	0.8f, 0.0f, 0.0f,
2092	};
2093	obj.texcoords = { 0.0f };
2094	obj.selected_colors = { 0.0f };
2095
2096	mat4 T = translate(mat4(1.0f), pos);
2097	mat4 R = rotate(mat4(1.0f), 60.0f * (float)ONE_DEG_IN_RAD, vec3(1.0f, 1.0f, -1.0f));
2098	obj.model_base = T * R * scale(mat4(1.0f), vec3(0.1f, 0.1f, 0.1f));
2099
2100	obj.translate_mat = T;
2101
2102	addObjectToScene(obj, shaderBufferInfo,
2103	points_vbo,
2104	colors_vbo,
2105	selected_colors_vbo,
2106	texcoords_vbo,
2107	normals_vbo,
2108	ubo,
2109	model_mat_idx_vbo);
2110	}
2111
2112	float getRandomNum(float low, float high) {
2113	return low + ((float)rand()/RAND_MAX) * (high-low);
2114	}

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