Annotation of /examples/iso2d-demo/main.c

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1 :	jhr	1880	/*! \file main.c
2 :			*
3 :			* \author John Reppy
4 :			*
5 :			* Main program for Diderot ISO2d animation.
6 :			*/
7 :
8 :			/*
9 :			* COPYRIGHT (c) 2012 The Diderot Project (http://diderot-language.cs.uchicago.edu)
10 :			* All rights reserved.
11 :			*/
12 :
13 :			#include <AntTweakBar.h>
14 :	jhr	1882	#include "GL/glfw.h"
15 :			#ifdef DIDEROT_CODE
16 :			#include "vr-lite-cam.h"
17 :	jhr	1880	#endif
18 :	jhr	1882	#include "teem/nrrd.h"
19 :			#include "teem/biff.h"
20 :	jhr	1880
21 :			/* pixel dimensions of output */
22 :			#define WIDTH 512
23 :			#define HEIGHT 512
24 :
25 :			/***** Globals for viewing, etc. *****/
26 :
27 :			Nrrd *Diderot; // input image nrrd
28 :			unsigned int Width; // view window width
29 :			unsigned int Height; // view window height
30 :			GLuint ImageTexture; // Texture ID of background image
31 :
32 :	jhr	1882	typedef struct {
33 :			TwBar *ctls;
34 :			unsigned int running;
35 :			} State_t;
36 :
37 :	jhr	1880	// Callback function called by GLUT to render screen
38 :	jhr	1882	void Draw ()
39 :	jhr	1880	{
40 :			// Clear frame buffer
41 :			glClearColor (0, 0, 0, 1);
42 :			glClear (GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
43 :
44 :			glEnable(GL_DEPTH_TEST);
45 :			glDisable(GL_CULL_FACE);
46 :
47 :			// Draw background
48 :	jhr	1882	float halfWid = 0.5 * (float)Width;
49 :			float halfHt = 0.5 * (float)Height;
50 :			glBindTexture (GL_TEXTURE_2D, ImageTexture);
51 :			glBegin (GL_QUADS);
52 :			glTexCoord2f (0.0, 0.0);
53 :			glVertex2f (-halfWid, -halfHt);
54 :			glTexCoord2f (1.0, 0.0);
55 :			glVertex2f (halfWid, -halfHt);
56 :			glTexCoord2f (1.0, 1.0);
57 :			glVertex2f (halfWid, halfHt);
58 :			glTexCoord2f (0.0, 1.0);
59 :			glVertex2f (-halfWid, halfHt);
60 :			glEnd();
61 :	jhr	1880
62 :			// Draw current render state
63 :
64 :			// Draw tweak bars
65 :			TwDraw();
66 :
67 :			// Present frame buffer
68 :	jhr	1882	glfwSwapBuffers();
69 :	jhr	1880	}
70 :
71 :	jhr	1882	// Callback function called by GLFW when window size changes
72 :			void GLFWCALL WindowSizeCB (int width, int height)
73 :	jhr	1880	{
74 :	jhr	1882	double halfWid = 0.5 * (double)width;
75 :			double halfHt = 0.5 * (double)height;
76 :
77 :	jhr	1880	// Set OpenGL viewport and camera
78 :	jhr	1882	glViewport(0, 0, width, height);
79 :			glMatrixMode(GL_PROJECTION);
80 :			glLoadIdentity();
81 :			gluOrtho2D (-halfWid, halfWid, -halfHt, halfHt);
82 :
83 :	jhr	1880	glMatrixMode (GL_MODELVIEW);
84 :			glLoadIdentity ();
85 :	jhr	1882	gluLookAt (
86 :			0.0, 0.0, 1.0,
87 :			0.0, 0.0, 0.0,
88 :			0.0, 1.0, 0.0);
89 :	jhr	1880
90 :	jhr	1882	// Send the new window size to AntTweakBar
91 :			TwWindowSize(width, height);
92 :	jhr	1880
93 :			// remember width and height
94 :			Width = width;
95 :			Height = height;
96 :
97 :			}
98 :
99 :			// initialize a texture from a grayscale Nrrd file
100 :			void InitTexture (Nrrd *nin)
101 :			{
102 :			if ((nin->dim != 2)
103 :			|| (nin->axis[0].kind != nrrdKindSpace)
104 :			|| (nin->axis[1].kind != nrrdKindSpace)) {
105 :			fprintf (stderr, "unable to handle nrrd file\n");
106 :			exit (1);
107 :			}
108 :
109 :			// determine the pixel format for the texture
110 :			GLenum type;
111 :			switch (nin->type) {
112 :			case nrrdTypeUChar: type = GL_UNSIGNED_BYTE; break;
113 :			case nrrdTypeFloat: type = GL_FLOAT; break;
114 :			default:
115 :			fprintf (stderr, "unable to handle nrdd file type %d\n", nin->type);
116 :			exit (1);
117 :			}
118 :
119 :			// generate the TeXID
120 :			GLuint texId;
121 :			glGenTextures (1, &texId);
122 :
123 :			// load the texture data
124 :			glBindTexture (GL_TEXTURE_2D, texId);
125 :			glTexImage2D (GL_TEXTURE_2D, /* or GL_TEXTURE_RECTANGLE ? */
126 :			0,
127 :			GL_RED,
128 :	jhr	1882	nin->axis[0].size, nin->axis[1].size, 0,
129 :	jhr	1880	GL_RED, type,
130 :			nin->data);
131 :			/* check for error */
132 :
133 :			ImageTexture = texId;
134 :			}
135 :
136 :	jhr	1882	void TW_CALL StartButtonCB (void *data)
137 :			{
138 :			State_t *st = (State_t *)data;
139 :
140 :			if (st->running == 0) {
141 :			st->running = 1;
142 :			TwSetParam (st->ctls, "StartButton", "label", TW_PARAM_CSTRING, 1, "Stop");
143 :			}
144 :			else {
145 :			st->running = 0;
146 :			TwSetParam (st->ctls, "StartButton", "label", TW_PARAM_CSTRING, 1, "Start");
147 :			}
148 :			}
149 :
150 :	jhr	1880	int main (int argc, const char **argv)
151 :			{
152 :	jhr	1882	State_t state = { .running = 0 };
153 :	jhr	1880
154 :	jhr	1882	// Initialize GLFW
155 :			if (0 == glfwInit()) {
156 :			// An error occured
157 :			fprintf(stderr, "GLFW initialization failed\n");
158 :			return 1;
159 :			}
160 :	jhr	1880
161 :	jhr	1882	GLFWvidmode mode;
162 :			glfwGetDesktopMode (&mode);
163 :			if (0 == glfwOpenWindow(WIDTH, HEIGHT, mode.RedBits, mode.GreenBits, mode.BlueBits, 0, 0, 0, GLFW_WINDOW) ) {
164 :			// A fatal error occured
165 :			fprintf(stderr, "Cannot open GLFW window\n");
166 :			glfwTerminate();
167 :			return 1;
168 :			}
169 :			glfwEnable(GLFW_MOUSE_CURSOR);
170 :			glfwEnable(GLFW_KEY_REPEAT);
171 :			glfwSetWindowTitle("Diderot Iso2D Animation");
172 :
173 :	jhr	1880	// Initialize AntTweakBar
174 :			TwInit (TW_OPENGL, 0);
175 :
176 :	jhr	1882	// create a tweakbar
177 :			TwBar *tweakBar = TwNewBar("Controls");
178 :			state.ctls = tweakBar;
179 :			unsigned int NumSteps = 0;
180 :			TwAddVarRO (tweakBar, "NumSteps", TW_TYPE_UINT32, &NumSteps, " label='# of steps' ");
181 :			TwAddButton (tweakBar, "StartButton", StartButtonCB, &state, " label='Start' ");
182 :	jhr	1880
183 :	jhr	1882	// Set GLFW event callbacks
184 :			glfwSetWindowSizeCallback (WindowSizeCB);
185 :			glfwSetMouseButtonCallback ((GLFWmousebuttonfun)TwEventMouseButtonGLFW); // redirect to AntTweakBar
186 :			glfwSetMousePosCallback ((GLFWmouseposfun)TwEventMousePosGLFW); // redirect to AntTweakBar
187 :			glfwSetMouseWheelCallback ((GLFWmousewheelfun)TwEventMouseWheelGLFW); // redirect to AntTweakBar
188 :			glfwSetKeyCallback ((GLFWkeyfun)TwEventKeyGLFW); // redirect to AntTweakBar
189 :			glfwSetCharCallback ((GLFWcharfun)TwEventCharGLFW); // redirect to AntTweakBar
190 :
191 :	jhr	1880	// load Diderot image as nrrd file
192 :	jhr	1882	Diderot = nrrdNew();
193 :			if (nrrdLoad(Diderot, "data/ddro-80.nrrd", 0) != 0) {
194 :	jhr	1880	char *msg = biffGetDone(NRRD);
195 :			fprintf (stderr, "Error loading nrrd file: %s", msg);
196 :			free (msg);
197 :			return 0;
198 :			}
199 :
200 :	jhr	1882	InitTexture (Diderot);
201 :
202 :			// Main loop (repeated while window is not closed and [ESC] is not pressed)
203 :			while (glfwGetWindowParam(GLFW_OPENED) && !glfwGetKey(GLFW_KEY_ESC)) {
204 :			Draw();
205 :			}
206 :
207 :			#ifdef DIDEROT_CODE
208 :	jhr	1880	ISO_World_t *wrld = ISO_Init ();
209 :
210 :			ISO_Initially (wrld);
211 :
212 :			uint32_t nSteps = ISO_Run (wrld, 0);
213 :
214 :			// get results
215 :			Nrrd *nData = nrrdNew();
216 :			if (ISO_OutputGet_outRGBA (wrld, nData)) {
217 :			// error
218 :			fprintf(stderr, "Error getting nrrd data\n");
219 :			return 1;
220 :			}
221 :
222 :			if (nrrdSave("out.nrrd", nData, NULL)) {
223 :			char *err = biffGetDone(NRRD);
224 :			fprintf(stderr, "Trouble saving nrrd struct: %s\n", err);
225 :			return 1;
226 :			}
227 :
228 :			ISO_Shutdown (wrld);
229 :	jhr	1882	#endif
230 :	jhr	1880
231 :	jhr	1882	// Terminate AntTweakBar and GLFW
232 :			TwTerminate();
233 :			glfwTerminate();
234 :
235 :	jhr	1880	return 0;
236 :			}

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