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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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AntTweakBar/examples/TwSimpleSDL.c Normal file
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// ---------------------------------------------------------------------------
//
// @file TwSimpleSDL.c
// @brief A simple example that uses AntTweakBar with OpenGL and SDL 1.2
//
// AntTweakBar: http://anttweakbar.sourceforge.net/doc
// OpenGL: http://www.opengl.org
// SDL: http://www.libsdl.org
//
// @author Philippe Decaudin
//
// ---------------------------------------------------------------------------
#include <AntTweakBar.h>
#if defined(_WIN32) || defined(_WIN64)
// MiniSDL12.h is provided to avoid the need of having SDL installed to
// recompile this example. Do not use it in your own programs, better
// install and use the actual SDL library SDK.
# define USE_MINI_SDL
#endif
#ifdef USE_MINI_SDL
# include "../src/MiniSDL12.h"
#else
# include <SDL/SDL.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#if defined(_WIN32) || defined(_WIN64)
# include <windows.h> // required by gl.h
#endif
#include <GL/gl.h>
#include <GL/glu.h>
// SDL redefines main
#ifdef main
# undef main
#endif
int main()
{
const SDL_VideoInfo* video = NULL;
int width = 640, height = 480;
int bpp, flags;
int quit = 0;
TwBar *bar;
int n, numCubes = 30;
float color0[] = { 1.0f, 0.5f, 0.0f };
float color1[] = { 0.5f, 1.0f, 0.0f };
double ka = 5.3, kb = 1.7, kc = 4.1;
// Initialize SDL, then get the current video mode and use it to create a SDL window.
if( SDL_Init(SDL_INIT_VIDEO)<0 )
{
fprintf(stderr, "Video initialization failed: %s\n", SDL_GetError());
SDL_Quit();
exit(1);
}
video = SDL_GetVideoInfo();
if( !video )
{
fprintf(stderr, "Video query failed: %s\n", SDL_GetError());
SDL_Quit();
exit(1);
}
SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 8);
SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 8);
//SDL_GL_SetAttribute(SDL_GL_ALPHA_SIZE, 1);
SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
SDL_GL_SetAttribute(SDL_GL_DOUBLEBUFFER, 1);
bpp = video->vfmt->BitsPerPixel;
flags = SDL_OPENGL | SDL_HWSURFACE | SDL_RESIZABLE;
//flags |= SDL_FULLSCREEN;
if( !SDL_SetVideoMode(width, height, bpp, flags) )
{
fprintf(stderr, "Video mode set failed: %s\n", SDL_GetError());
SDL_Quit();
exit(1);
}
SDL_WM_SetCaption("AntTweakBar simple example using SDL", "AntTweakBar+SDL");
// Enable SDL unicode and key-repeat
SDL_EnableUNICODE(1);
SDL_EnableKeyRepeat(SDL_DEFAULT_REPEAT_DELAY, SDL_DEFAULT_REPEAT_INTERVAL);
// Set OpenGL viewport and states
glViewport(0, 0, width, height);
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0); // use default light diffuse and position
glEnable(GL_NORMALIZE);
glEnable(GL_COLOR_MATERIAL);
glDisable(GL_CULL_FACE);
glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);
// Initialize AntTweakBar
TwInit(TW_OPENGL, NULL);
// Tell the window size to AntTweakBar
TwWindowSize(width, height);
// Create a tweak bar
bar = TwNewBar("TweakBar");
TwDefine(" GLOBAL help='This example shows how to integrate AntTweakBar with SDL and OpenGL.\nPress [Space] to toggle fullscreen.' "); // Message added to the help bar.
// Add 'width' and 'height' to 'bar': they are read-only (RO) variables of type TW_TYPE_INT32.
TwAddVarRO(bar, "Width", TW_TYPE_INT32, &width,
" label='Wnd width' help='Width of the graphics window (in pixels)' ");
TwAddVarRO(bar, "Height", TW_TYPE_INT32, &height,
" label='Wnd height' help='Height of the graphics window (in pixels)' ");
// Add 'numCurves' to 'bar': this is a modifiable variable of type TW_TYPE_INT32. Its shortcuts are [c] and [C].
TwAddVarRW(bar, "NumCubes", TW_TYPE_INT32, &numCubes,
" label='Number of cubes' min=1 max=100 keyIncr=c keyDecr=C help='Defines the number of cubes in the scene.' ");
// Add 'ka', 'kb and 'kc' to 'bar': they are modifiable variables of type TW_TYPE_DOUBLE
TwAddVarRW(bar, "ka", TW_TYPE_DOUBLE, &ka,
" label='X path coeff' keyIncr=1 keyDecr=CTRL+1 min=-10 max=10 step=0.01 ");
TwAddVarRW(bar, "kb", TW_TYPE_DOUBLE, &kb,
" label='Y path coeff' keyIncr=2 keyDecr=CTRL+2 min=-10 max=10 step=0.01 ");
TwAddVarRW(bar, "kc", TW_TYPE_DOUBLE, &kc,
" label='Z path coeff' keyIncr=3 keyDecr=CTRL+3 min=-10 max=10 step=0.01 ");
// Add 'color0' and 'color1' to 'bar': they are modifable variables of type TW_TYPE_COLOR3F (3 floats color)
TwAddVarRW(bar, "color0", TW_TYPE_COLOR3F, &color0,
" label='Start color' help='Color of the first cube.' ");
TwAddVarRW(bar, "color1", TW_TYPE_COLOR3F, &color1,
" label='End color' help='Color of the last cube. Cube colors are interpolated between the Start and End colors.' ");
// Add 'quit' to 'bar': this is a modifiable (RW) variable of type TW_TYPE_BOOL32
// (a boolean stored in a 32 bits integer). Its shortcut is [ESC].
TwAddVarRW(bar, "Quit", TW_TYPE_BOOL32, &quit,
" label='Quit?' true='+' false='-' key='ESC' help='Quit program.' ");
// Main loop:
// - Draw some cubes
// - Process events
while( !quit )
{
SDL_Event event;
int handled;
// Clear screen
glClearColor(0.5f, 0.75f, 0.8f, 1);
glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
// Set OpenGL camera
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(40, (double)width/height, 1, 10);
gluLookAt(0,0,3, 0,0,0, 0,1,0);
// Draw cubes
for( n=0; n<numCubes; ++n )
{
double t = 0.05*n - (double)SDL_GetTicks()/2000.0;
double r = 5.0*n + (double)SDL_GetTicks()/10.0;
float c = (float)n/numCubes;
// Set cube position
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslated(0.6*cos(ka*t), 0.6*cos(kb*t), 0.6*sin(kc*t));
glRotated(r, 0.2, 0.7, 0.2);
glScaled(0.1, 0.1, 0.1);
glTranslated(-0.5, -0.5, -0.5);
// Set cube color
glColor3f((1.0f-c)*color0[0]+c*color1[0], (1.0f-c)*color0[1]+c*color1[1], (1.0f-c)*color0[2]+c*color1[2]);
// Draw cube
glBegin(GL_QUADS);
glNormal3f(0,0,-1); glVertex3f(0,0,0); glVertex3f(0,1,0); glVertex3f(1,1,0); glVertex3f(1,0,0); // front face
glNormal3f(0,0,+1); glVertex3f(0,0,1); glVertex3f(1,0,1); glVertex3f(1,1,1); glVertex3f(0,1,1); // back face
glNormal3f(-1,0,0); glVertex3f(0,0,0); glVertex3f(0,0,1); glVertex3f(0,1,1); glVertex3f(0,1,0); // left face
glNormal3f(+1,0,0); glVertex3f(1,0,0); glVertex3f(1,1,0); glVertex3f(1,1,1); glVertex3f(1,0,1); // right face
glNormal3f(0,-1,0); glVertex3f(0,0,0); glVertex3f(1,0,0); glVertex3f(1,0,1); glVertex3f(0,0,1); // bottom face
glNormal3f(0,+1,0); glVertex3f(0,1,0); glVertex3f(0,1,1); glVertex3f(1,1,1); glVertex3f(1,1,0); // top face
glEnd();
}
// Draw tweak bars
TwDraw();
// Present frame buffer
SDL_GL_SwapBuffers();
// Process incoming events
while( SDL_PollEvent(&event) )
{
// Send event to AntTweakBar
handled = TwEventSDL(&event, SDL_MAJOR_VERSION, SDL_MINOR_VERSION);
// If event has not been handled by AntTweakBar, process it
if( !handled )
{
switch( event.type )
{
case SDL_QUIT: // Window is closed
quit = 1;
break;
case SDL_VIDEORESIZE: // Window size has changed
// Resize SDL video mode
width = event.resize.w;
height = event.resize.h;
if( !SDL_SetVideoMode(width, height, bpp, flags) )
fprintf(stderr, "WARNING: Video mode set failed: %s\n", SDL_GetError());
// Resize OpenGL viewport
glViewport(0, 0, width, height);
// Restore OpenGL states (SDL seems to lost them)
glEnable(GL_DEPTH_TEST);
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glEnable(GL_NORMALIZE);
glEnable(GL_COLOR_MATERIAL);
glDisable(GL_CULL_FACE);
glColorMaterial(GL_FRONT_AND_BACK, GL_DIFFUSE);
// TwWindowSize has been called by TwEventSDL,
// so it is not necessary to call it again here.
break;
case SDL_KEYDOWN:
if( event.key.keysym.sym==' ' ) // toggle fullscreen if Space key is pressed
{
flags ^= SDL_FULLSCREEN;
SDL_SetVideoMode(800, 600, bpp, flags);
// Push a resize event because SDL does not do it for us
event.type = SDL_VIDEORESIZE;
event.resize.w = 800;
event.resize.h = 600;
SDL_PushEvent(&event);
}
break;
}
}
}
} // End of main loop
// Terminate AntTweakBar
TwTerminate();
// Terminate SDL
SDL_Quit();
return 0;
}