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template project, first version

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rachelchu
2017-10-11 15:01:05 +02:00
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// ---------------------------------------------------------------------------
//
// @file TwDualGLUT.c
// @brief This example illustrates the use of AntTweakBar with multiple
// windows. Here we are using GLUT to create a main window having
// two sub-windows, each sub-window has a tweak bar.
// This example extends the TwSimpleGLUT example.
//
// AntTweakBar: http://anttweakbar.sourceforge.net/doc
// OpenGL: http://www.opengl.org
// GLUT: http://opengl.org/resources/libraries/glut
//
// ---------------------------------------------------------------------------
#include <AntTweakBar.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#if defined(_WIN32) || defined(_WIN64)
// MiniGLUT.h is provided to avoid the need of having GLUT installed to
// recompile this example. Do not use it in your own programs, better
// install and use the actual GLUT library SDK.
# define USE_MINI_GLUT
#endif
#if defined(USE_MINI_GLUT)
# include "../src/MiniGLUT.h"
#elif defined(_MACOSX)
# include <GLUT/glut.h>
#else
# include <GL/glut.h>
#endif
// This example displays one of the following shapes in each sub-window
typedef enum { SHAPE_TEAPOT=1, SHAPE_TORUS, SHAPE_CONE } Shape;
#define NUM_SHAPES 3
typedef struct
{
int WinID;
TwBar *Bar;
Shape ObjectShape;
float Zoom;
float Rotation[4];
int AutoRotate;
int RotateTime;
float RotateStart[4];
float MatAmbient[4];
float MatDiffuse[4];
float LightMultiplier;
float LightDirection[3];
} SubWindowData;
SubWindowData g_SubWindowData[2];
// Routine to set a quaternion from a rotation axis and angle
// ( input axis = float[3] angle = float output: quat = float[4] )
void SetQuaternionFromAxisAngle(const float *axis, float angle, float *quat)
{
float sina2, norm;
sina2 = (float)sin(0.5f * angle);
norm = (float)sqrt(axis[0]*axis[0] + axis[1]*axis[1] + axis[2]*axis[2]);
quat[0] = sina2 * axis[0] / norm;
quat[1] = sina2 * axis[1] / norm;
quat[2] = sina2 * axis[2] / norm;
quat[3] = (float)cos(0.5f * angle);
}
// Routine to convert a quaternion to a 4x4 matrix
// ( input: quat = float[4] output: mat = float[4*4] )
void ConvertQuaternionToMatrix(const float *quat, float *mat)
{
float yy2 = 2.0f * quat[1] * quat[1];
float xy2 = 2.0f * quat[0] * quat[1];
float xz2 = 2.0f * quat[0] * quat[2];
float yz2 = 2.0f * quat[1] * quat[2];
float zz2 = 2.0f * quat[2] * quat[2];
float wz2 = 2.0f * quat[3] * quat[2];
float wy2 = 2.0f * quat[3] * quat[1];
float wx2 = 2.0f * quat[3] * quat[0];
float xx2 = 2.0f * quat[0] * quat[0];
mat[0*4+0] = - yy2 - zz2 + 1.0f;
mat[0*4+1] = xy2 + wz2;
mat[0*4+2] = xz2 - wy2;
mat[0*4+3] = 0;
mat[1*4+0] = xy2 - wz2;
mat[1*4+1] = - xx2 - zz2 + 1.0f;
mat[1*4+2] = yz2 + wx2;
mat[1*4+3] = 0;
mat[2*4+0] = xz2 + wy2;
mat[2*4+1] = yz2 - wx2;
mat[2*4+2] = - xx2 - yy2 + 1.0f;
mat[2*4+3] = 0;
mat[3*4+0] = mat[3*4+1] = mat[3*4+2] = 0;
mat[3*4+3] = 1;
}
// Routine to multiply 2 quaternions (ie, compose rotations)
// ( input q1 = float[4] q2 = float[4] output: qout = float[4] )
void MultiplyQuaternions(const float *q1, const float *q2, float *qout)
{
float qr[4];
qr[0] = q1[3]*q2[0] + q1[0]*q2[3] + q1[1]*q2[2] - q1[2]*q2[1];
qr[1] = q1[3]*q2[1] + q1[1]*q2[3] + q1[2]*q2[0] - q1[0]*q2[2];
qr[2] = q1[3]*q2[2] + q1[2]*q2[3] + q1[0]*q2[1] - q1[1]*q2[0];
qr[3] = q1[3]*q2[3] - (q1[0]*q2[0] + q1[1]*q2[1] + q1[2]*q2[2]);
qout[0] = qr[0]; qout[1] = qr[1]; qout[2] = qr[2]; qout[3] = qr[3];
}
// Return elapsed time in milliseconds
int GetTimeMs()
{
#if !defined(_WIN32)
return glutGet(GLUT_ELAPSED_TIME);
#else
// glutGet(GLUT_ELAPSED_TIME) seems buggy on Windows
return (int)GetTickCount();
#endif
}
// Find the current WindowData
SubWindowData *GetCurrentSubWindowData()
{
int i, currWinID;
currWinID = glutGetWindow();
for (i = 0; i < 2; i++)
if (g_SubWindowData[i].WinID == currWinID)
return &g_SubWindowData[i];
return NULL;
}
// Callback function called by GLUT to render the main window content
void DisplayMainWindow(void)
{
// Clear frame buffer
glClearColor(1, 0.8f, 0.4f, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
// Present frame buffer
glutSwapBuffers();
}
// Callback function called by GLUT when the main window size has changed
void ReshapeMainWindow(int width, int height)
{
if (width > 32 && height > 32)
{
glutSetWindow(g_SubWindowData[0].WinID);
glutPositionWindow(8, 8);
glutReshapeWindow(width/2-16, height-16);
glutSetWindow(g_SubWindowData[1].WinID);
glutPositionWindow(width/2+8, 8);
glutReshapeWindow(width/2-16, height-16);
}
}
// Callback function called by GLUT to render sub-window content
void DisplaySubWindow(void)
{
float v[4]; // will be used to set light parameters
float mat[4*4]; // rotation matrix
SubWindowData *win;
win = GetCurrentSubWindowData();
if (win == NULL) return;
// Tell AntTweakBar which is the current window
TwSetCurrentWindow(win->WinID);
// Clear frame buffer
glClearColor(0, 0, 0, 1);
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);
glDisable(GL_CULL_FACE);
glEnable(GL_NORMALIZE);
// Set light
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
v[0] = v[1] = v[2] = win->LightMultiplier*0.4f; v[3] = 1.0f;
glLightfv(GL_LIGHT0, GL_AMBIENT, v);
v[0] = v[1] = v[2] = win->LightMultiplier*0.8f; v[3] = 1.0f;
glLightfv(GL_LIGHT0, GL_DIFFUSE, v);
v[0] = -win->LightDirection[0]; v[1] = -win->LightDirection[1]; v[2] = -win->LightDirection[2]; v[3] = 0.0f;
glLightfv(GL_LIGHT0, GL_POSITION, v);
// Set material
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, win->MatAmbient);
glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, win->MatDiffuse);
// Rotate and draw shape
glPushMatrix();
glTranslatef(0.5f, -0.3f, 0.0f);
if( win->AutoRotate )
{
float axis[3] = { 0, 1, 0 };
float angle = (float)(GetTimeMs()-win->RotateTime)/1000.0f;
float quat[4];
SetQuaternionFromAxisAngle(axis, angle, quat);
MultiplyQuaternions(win->RotateStart, quat, win->Rotation);
}
ConvertQuaternionToMatrix(win->Rotation, mat);
glMultMatrixf(mat);
glScalef(win->Zoom, win->Zoom, win->Zoom);
glCallList(win->ObjectShape);
glPopMatrix();
// Draw tweak bars
TwDraw();
// Present frame buffer
glutSwapBuffers();
// Recall Display at next frame
glutPostRedisplay();
}
// Callback function called by GLUT when sub-window size has changed
void ReshapeSubWindow(int width, int height)
{
SubWindowData *win;
win = GetCurrentSubWindowData();
if (win == NULL) return;
// Set OpenGL viewport and camera
glViewport(0, 0, width, height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(40, (double)width/height, 1, 10);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
gluLookAt(0,0,5, 0,0,0, 0,1,0);
glTranslatef(0, 0.6f, -1);
// Send the new window size to AntTweakBar
TwSetCurrentWindow(win->WinID);
TwWindowSize(width, height);
}
// Function called at exit
void Terminate(void)
{
int i;
for (i=0; i<2; i++) {
glutSetWindow(g_SubWindowData[i].WinID);
glDeleteLists(SHAPE_TEAPOT, NUM_SHAPES);
}
TwTerminate();
}
// Callback function called when the 'AutoRotate' variable value of the tweak bar has changed
void TW_CALL SetAutoRotateCB(const void *value, void *clientData)
{
SubWindowData *win;
win = (SubWindowData *)clientData;
win->AutoRotate = *(const int *)value; // copy value to win->AutoRotate
if (win->AutoRotate != 0)
{
// init rotation
win->RotateTime = GetTimeMs();
win->RotateStart[0] = win->Rotation[0];
win->RotateStart[1] = win->Rotation[1];
win->RotateStart[2] = win->Rotation[2];
win->RotateStart[3] = win->Rotation[3];
}
// make Rotation variable read-only or read-write
TwSetCurrentWindow(win->WinID);
TwSetParam(win->Bar, "ObjRotation", "readonly", TW_PARAM_INT32, 1, &win->AutoRotate);
}
// Callback function called by the tweak bar to get the 'AutoRotate' value
void TW_CALL GetAutoRotateCB(void *value, void *clientData)
{
SubWindowData *win;
win = (SubWindowData *)clientData;
*(int *)value = win->AutoRotate; // copy win->AutoRotate to value
}
// Mouse Button event callbacks
int MouseButtonCB(int glutButton, int glutState, int mouseX, int mouseY)
{
TwSetCurrentWindow(glutGetWindow());
return TwEventMouseButtonGLUT(glutButton,glutState,mouseX,mouseY);
}
// Mouse Motion event callbacks
int MouseMotionCB(int mouseX, int mouseY)
{
TwSetCurrentWindow(glutGetWindow());
return TwEventMouseMotionGLUT(mouseX,mouseY);
}
// Keyboard event callbacks
int KeyboardCB(unsigned char glutKey, int mouseX, int mouseY)
{
TwSetCurrentWindow(glutGetWindow());
return TwEventKeyboardGLUT(glutKey,mouseX,mouseY);
}
// Special key event callbacks
int SpecialKeyCB(int glutKey, int mouseX, int mouseY)
{
TwSetCurrentWindow(glutGetWindow());
return TwEventSpecialGLUT(glutKey,mouseX,mouseY);
}
// Setup new sub-window
void SetupSubWindow(int subWinIdx)
{
float axis[] = { 0.7f, 0.7f, 0.0f }; // initial model rotation
float angle = 0.8f;
SubWindowData *win;
win = &g_SubWindowData[subWinIdx];
win->ObjectShape = (subWinIdx == 0) ? SHAPE_TEAPOT : SHAPE_TORUS;
win->Zoom = 1;
win->AutoRotate = (subWinIdx == 0);
win->MatAmbient[0] = (subWinIdx == 1) ? 0.0f : 0.5f;; win->MatAmbient[1] = win->MatAmbient[2] = 0.2f; win->MatAmbient[3] = 1;
win->MatDiffuse[0] = (subWinIdx == 1) ? 0.0f : 1.0f; win->MatDiffuse[1] = 1; win->MatDiffuse[2] = 0; win->MatDiffuse[3] = 1;
win->LightMultiplier = 1;
win->LightDirection[0] = win->LightDirection[1] = win->LightDirection[2] = -0.57735f;
win->RotateTime = GetTimeMs();
SetQuaternionFromAxisAngle(axis, angle, win->Rotation);
SetQuaternionFromAxisAngle(axis, angle, win->RotateStart);
glutSetWindow(win->WinID);
// Set GLUT callbacks
glutDisplayFunc(DisplaySubWindow);
glutReshapeFunc(ReshapeSubWindow);
// Set GLUT event callbacks
// - Register mouse button events callback
glutMouseFunc((GLUTmousebuttonfun)MouseButtonCB);
// - Register mouse motion events callback
glutMotionFunc((GLUTmousemotionfun)MouseMotionCB);
// - Register mouse "passive" motion events (same as Motion)
glutPassiveMotionFunc((GLUTmousemotionfun)MouseMotionCB);
// - Register keyboard events callback
glutKeyboardFunc((GLUTkeyboardfun)KeyboardCB);
// - Register special key events callback
glutSpecialFunc((GLUTspecialfun)SpecialKeyCB);
// - Send 'glutGetModifers' function pointer to AntTweakBar;
// required because the GLUT key event functions do not report key modifiers states.
TwGLUTModifiersFunc(glutGetModifiers);
// Create some 3D objects (stored in display lists)
glNewList(SHAPE_TEAPOT, GL_COMPILE);
glutSolidTeapot(1.0);
glEndList();
glNewList(SHAPE_TORUS, GL_COMPILE);
glutSolidTorus(0.3, 1.0, 16, 32);
glEndList();
glNewList(SHAPE_CONE, GL_COMPILE);
glutSolidCone(1.0, 1.5, 64, 4);
glEndList();
// Declare this window as current for AntTweakBar.
// Here, this will create a new AntTweakBar context for this window,
// which will be identified by the number WinID.
TwSetCurrentWindow(win->WinID);
// Create a tweak bar
win->Bar = TwNewBar("TweakBar");
TwDefine(" GLOBAL help='This example shows how to use AntTweakBar with multiple windows.' "); // Message added to the help bar.
TwDefine(" TweakBar size='200 400' color='96 216 224' "); // change default tweak bar size and color
// Add 'win->Zoom' to 'bar': this is a modifable (RW) variable of type TW_TYPE_FLOAT. Its key shortcuts are [z] and [Z].
TwAddVarRW(win->Bar, "Zoom", TW_TYPE_FLOAT, &win->Zoom,
" min=0.01 max=2.5 step=0.01 keyIncr=z keyDecr=Z help='Scale the object (1=original size).' ");
// Add 'win->Rotation' to 'bar': this is a variable of type TW_TYPE_QUAT4F which defines the object's orientation
TwAddVarRW(win->Bar, "ObjRotation", TW_TYPE_QUAT4F, &win->Rotation,
" label='Object rotation' open help='Change the object orientation.' ");
// Add callback to toggle auto-rotate mode (callback functions are defined above).
TwAddVarCB(win->Bar, "AutoRotate", TW_TYPE_BOOL32, SetAutoRotateCB, GetAutoRotateCB, win,
" label='Auto-rotate' key=space help='Toggle auto-rotate mode.' ");
// Add 'win->LightMultiplier' to 'bar': this is a variable of type TW_TYPE_FLOAT. Its key shortcuts are [+] and [-].
TwAddVarRW(win->Bar, "Multiplier", TW_TYPE_FLOAT, &win->LightMultiplier,
" label='Light booster' min=0.1 max=4 step=0.02 keyIncr='+' keyDecr='-' help='Increase/decrease the light power.' ");
// Add 'win->LightDirection' to 'bar': this is a variable of type TW_TYPE_DIR3F which defines the light direction
TwAddVarRW(win->Bar, "LightDir", TW_TYPE_DIR3F, &win->LightDirection,
" label='Light direction' open help='Change the light direction.' ");
// Add 'win->MatAmbient' to 'bar': this is a variable of type TW_TYPE_COLOR3F (3 floats color, alpha is ignored)
// and is inserted into a group named 'Material'.
TwAddVarRW(win->Bar, "Ambient", TW_TYPE_COLOR3F, &win->MatAmbient, " group='Material' ");
// Add 'win->MatDiffuse' to 'bar': this is a variable of type TW_TYPE_COLOR3F (3 floats color, alpha is ignored)
// and is inserted into group 'Material'.
TwAddVarRW(win->Bar, "Diffuse", TW_TYPE_COLOR3F, &win->MatDiffuse, " group='Material' ");
// Add the enum variable 'win->ObjectShape' to 'bar'
// (before adding an enum variable, its enum type must be declared to AntTweakBar as follow)
{
// ShapeEV associates Shape enum values with labels that will be displayed instead of enum values
TwEnumVal shapeEV[NUM_SHAPES] = { {SHAPE_TEAPOT, "Teapot"}, {SHAPE_TORUS, "Torus"}, {SHAPE_CONE, "Cone"} };
// Create a type for the enum shapeEV
TwType shapeType = TwDefineEnum("ShapeType", shapeEV, NUM_SHAPES);
// add 'win->CurrentShape' to 'bar': this is a variable of type ShapeType. Its key shortcuts are [<] and [>].
TwAddVarRW(win->Bar, "Shape", shapeType, &win->ObjectShape, " keyIncr='<' keyDecr='>' help='Change object shape.' ");
}
}
// Main
int main(int argc, char *argv[])
{
int mainWinID;
// Initialize GLUT
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(960, 480);
mainWinID = glutCreateWindow("AntTweakBar multi-window example");
glutCreateMenu(NULL);
glutDisplayFunc(DisplayMainWindow);
glutReshapeFunc(ReshapeMainWindow);
// Initialize AntTweakBar
TwInit(TW_OPENGL, NULL);
// Create two sub-windows
g_SubWindowData[0].WinID = glutCreateSubWindow(mainWinID, 8, 8, 480, 464);
SetupSubWindow(0);
g_SubWindowData[1].WinID = glutCreateSubWindow(mainWinID, 488, 8, 464, 464);
SetupSubWindow(1);
atexit(Terminate); // Called after glutMainLoop ends
// Call the GLUT main loop
glutMainLoop();
return 0;
}