Extras/CDTestFramework/AntTweakBar/examples/TwSimpleGLFW.c

   1 //      ---------------------------------------------------------------------------
   2 //
   3 //      @file           TwSimpleGLFW.c
   4 //      @brief          A simple example that uses AntTweakBar with
   5 //                              OpenGL and the GLFW windowing system.
   6 //
   7 //                              AntTweakBar: http://www.antisphere.com/Wiki/tools:anttweakbar
   8 //                              OpenGL:          http://www.opengl.org
   9 //                              GLFW:            http://glfw.sourceforge.net
  10 //
  11 //      @author         Philippe Decaudin - http://www.antisphere.com
  12 //      @date           2006/05/20
  13 //
  14 //      note:           TAB=4
  15 //
  16 //      Compilation:
  17 //      http://www.antisphere.com/Wiki/tools:anttweakbar:examples#twsimpleglfw
  18 //
  19 //      ---------------------------------------------------------------------------
  20
  21
  22 #include <AntTweakBar.h>
  23
  24 #define GLFW_DLL
  25 #include "glfw.h"
  26
  27 #include <stdio.h>
  28
  29 // Callback function called by GLFW when window size changes
  30 void GLFWCALL WindowSizeCB(int width, int height)
  31 {
  32         // Set OpenGL viewport and camera
  33         glViewport(0, 0, width, height);
  34         glMatrixMode(GL_PROJECTION);
  35         glLoadIdentity();
  36         gluPerspective(40, (double)width/height, 1, 10);
  37         gluLookAt(-1,0,3, 0,0,0, 0,1,0);
  38
  39         // Send the new window size to AntTweakBar
  40         TwWindowSize(width, height);
  41 }
  42
  43
  44 // This example program draws a possibly transparent cube
  45 void DrawModel(int wireframe)
  46 {
  47         int pass, numPass;
  48
  49         // Enable OpenGL transparency and light (could have been done once at init)
  50         glEnable(GL_BLEND);
  51         glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
  52         glEnable(GL_DEPTH_TEST);
  53         glEnable(GL_LIGHT0);    // use default light diffuse and position
  54         glLightModeli(GL_LIGHT_MODEL_TWO_SIDE, 1);
  55         glEnable(GL_COLOR_MATERIAL);
  56         glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);
  57         glEnable(GL_LINE_SMOOTH);
  58         glLineWidth(3.0);
  59
  60         if( wireframe )
  61         {
  62                 glDisable(GL_CULL_FACE);
  63                 glDisable(GL_LIGHTING);
  64                 glPolygonMode(GL_FRONT_AND_BACK, GL_LINE);
  65                 numPass = 1;
  66         }
  67         else
  68         {
  69                 glEnable(GL_CULL_FACE);
  70                 glEnable(GL_LIGHTING);
  71                 glPolygonMode(GL_FRONT_AND_BACK, GL_FILL);
  72                 numPass = 2;
  73         }
  74
  75         for( pass=0; pass<numPass; ++pass )
  76         {
  77                 // Since the material could be transparent, we draw the convex model in 2 passes:
  78                 // first its back faces, and second its front faces.
  79                 glCullFace( (pass==0) ? GL_FRONT : GL_BACK );
  80
  81                 // Draw the model (a cube)
  82                 glBegin(GL_QUADS);
  83                         glNormal3f(0,0,-1); glVertex3f(0,0,0); glVertex3f(0,1,0); glVertex3f(1,1,0); glVertex3f(1,0,0); // front face
  84                         glNormal3f(0,0,+1); glVertex3f(0,0,1); glVertex3f(1,0,1); glVertex3f(1,1,1); glVertex3f(0,1,1); // back face
  85                         glNormal3f(-1,0,0); glVertex3f(0,0,0); glVertex3f(0,0,1); glVertex3f(0,1,1); glVertex3f(0,1,0); // left face
  86                         glNormal3f(+1,0,0); glVertex3f(1,0,0); glVertex3f(1,1,0); glVertex3f(1,1,1); glVertex3f(1,0,1); // right face
  87                         glNormal3f(0,-1,0); glVertex3f(0,0,0); glVertex3f(1,0,0); glVertex3f(1,0,1); glVertex3f(0,0,1); // bottom face
  88                         glNormal3f(0,+1,0); glVertex3f(0,1,0); glVertex3f(0,1,1); glVertex3f(1,1,1); glVertex3f(1,1,0); // top face
  89                 glEnd();
  90         }
  91 }
  92
  93
  94 // Main
  95 int main()
  96 {
  97         GLFWvidmode mode;       // GLFW video mode
  98         TwBar *bar;                     // Pointer to a tweak bar
  99
 100         double time = 0, dt;// Current time and enlapsed time
 101         double turn = 0;        // Model turn counter
 102         double speed = 0.1;     // Model rotation speed
 103         int wire = 0;           // Draw model in wireframe?
 104         float bgColor[] = { 0.1f, 0.2f, 0.4f };                 // Background color
 105         unsigned char cubeColor[] = { 255, 0, 0, 255 }; // Model color (32bits RGBA)
 106
 107         // Intialize GLFW
 108         if( !glfwInit() )
 109         {
 110                 // A fatal error occured
 111                 fprintf(stderr, "GLFW initialization failed\n");
 112                 return 1;
 113         }
 114
 115         // Create a window
 116         glfwGetDesktopMode(&mode);
 117         if( !glfwOpenWindow(640, 480, mode.RedBits, mode.GreenBits, mode.BlueBits, 0, 16, 0, GLFW_WINDOW /* or GLFW_FULLSCREEN */) )
 118         {
 119                 // A fatal error occured
 120                 fprintf(stderr, "Cannot open GLFW window\n");
 121                 glfwTerminate();
 122                 return 1;
 123         }
 124         glfwEnable(GLFW_MOUSE_CURSOR);
 125         glfwEnable(GLFW_KEY_REPEAT);
 126         glfwSetWindowTitle("AntTweakBar simple example using GLFW");
 127
 128         // Initialize AntTweakBar
 129         if( !TwInit(TW_OPENGL, NULL) )
 130         {
 131                 // A fatal error occured
 132                 fprintf(stderr, "AntTweakBar initialization failed: %s\n", TwGetLastError());
 133                 glfwTerminate();
 134                 return 1;
 135         }
 136
 137         // Create a tweak bar
 138         bar = TwNewBar("TweakBar");
 139
 140         // Add 'speed' to 'bar': it is a modifable (RW) variable of type TW_TYPE_DOUBLE. Its key shortcuts are [s] and [S].
 141         TwAddVarRW(bar, "speed", TW_TYPE_DOUBLE, &speed, " label='Rot speed (tr/sec)' min=0 max=2 step=0.01 keyIncr=s keyDecr=S ");
 142         // Add 'wire' to 'bar': it is a modifable variable of type TW_TYPE_BOOL32 (32 bits boolean). Its key shortcut is [w].
 143         TwAddVarRW(bar, "wire", TW_TYPE_BOOL32, &wire, " label='Wireframe mode' key=w ");
 144         // Add 'time' to 'bar': it is a read-only (RO) variable of type TW_TYPE_DOUBLE, with 1 precision digit
 145         TwAddVarRO(bar, "time", TW_TYPE_DOUBLE, &time, " label='Time (sec)' precision=1 ");
 146         // Add 'bgColor' to 'bar': it is a modifable variable of type TW_TYPE_COLOR3F (3 floats color)
 147         TwAddVarRW(bar, "bgColor", TW_TYPE_COLOR3F, &bgColor, " label='Background color' ");
 148         // Add 'cubeColor' to 'bar': it is a modifable variable of type TW_TYPE_COLOR32 (32 bits color) with alpha
 149         TwAddVarRW(bar, "cubeColor", TW_TYPE_COLOR32, &cubeColor, " label='Cube color' alpha ");
 150
 151         // Set GLFW event callbacks
 152         // - Redirect window size changes to the callback function WindowSizeCB
 153         glfwSetWindowSizeCallback(WindowSizeCB);
 154         // - Directly redirect GLFW mouse button events to AntTweakBar
 155         glfwSetMouseButtonCallback((GLFWmousebuttonfun)TwEventMouseButtonGLFW);
 156         // - Directly redirect GLFW mouse position events to AntTweakBar
 157         glfwSetMousePosCallback((GLFWmouseposfun)TwEventMousePosGLFW);
 158         // - Directly redirect GLFW mouse wheel events to AntTweakBar
 159         glfwSetMouseWheelCallback((GLFWmousewheelfun)TwEventMouseWheelGLFW);
 160         // - Directly redirect GLFW key events to AntTweakBar
 161         glfwSetKeyCallback((GLFWkeyfun)TwEventKeyGLFW);
 162         // - Directly redirect GLFW char events to AntTweakBar
 163         glfwSetCharCallback((GLFWcharfun)TwEventCharGLFW);
 164         // - Redirect window size changes to the callback function WindowSizeCB
 165
 166         // Initialize time
 167         time = glfwGetTime();
 168         // Main loop (repeated while window is not closed and [ESC] is not pressed)
 169         while( glfwGetWindowParam(GLFW_OPENED) && !glfwGetKey(GLFW_KEY_ESC) )
 170         {
 171                 // Clear frame buffer using bgColor
 172                 glClearColor(bgColor[0], bgColor[1], bgColor[2], 1);
 173                 glClear( GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT );
 174
 175                 // Rotate model
 176                 dt = glfwGetTime() - time;
 177                 time += dt;
 178                 turn += speed*dt;
 179                 glMatrixMode(GL_MODELVIEW);
 180                 glLoadIdentity();
 181                 glRotated(360.0*turn, 0.4, 1, 0.2);
 182                 glTranslated(-0.5, -0.5, -0.5);
 183
 184                 // Set color and draw model
 185                 glColor4ubv(cubeColor);
 186                 DrawModel(wire);
 187
 188                 // Draw tweak bars
 189                 TwDraw();
 190
 191                 // Present frame buffer
 192                 glfwSwapBuffers();
 193         }
 194
 195         // Terminate AntTweakBar and GLFW
 196         TwTerminate();
 197         glfwTerminate();
 198
 199         return 0;
 200 }