main.cpp

GLSL tutorial with sourcecode

// ************************************************
// Light.cpp
// C++ Program: Basic Fragment Lighting
//
// (c) 2003-04 by Martin Christen
// 
// ************************************************

#include "../cwc/aGLSL.h"
#include "../cwc/simpleGL.h"
#include <GL/glut.h>
#include <iostream>
#include <math.h>

using namespace std;

#define FRAG_FILE "pervertex.frag"
#define VERT_FILE "pervertex.vert"

void sendProgramColor(int preset);

// GLobals:
aShaderManager  shadermanager;
aShaderObject* myShader = 0; 


//*************************************************************
// Draw a primitive (Torus) at x,y,z
int deg =0; // little animation
void primitive(float x, float y, float z)
{
   glPushMatrix();
   glTranslatef(x,y,z);
   glRotatef(deg,1.0,x,y);
   
   //glutSolidTorus(0.2,0.5,48,48);
   glColor4f(0.5, 0.0, 0.0, 1.0);
   //glutSolidSphere(0.6,32,32);
   glutSolidTeapot(1.0);
   //glutSolidCube(0.5);
   glPopMatrix();
}




//*************************************************************
//Draw one Frame (don't Swap Buffers)
float f=0.0;
float u=0.0;
void DrawFrame(void)
{   
   float xx=0.0,yy=0.0,zz=0.0;
   //xx = 5+cos(u - 0.785);
   //yy = 5+cos(2.0*u - 0.785); u=u+0.1;
   //zz = 5.0;
 
   GLfloat light_pos[] = { xx, yy, zz, 1.0};
   glPushMatrix();
   glLoadIdentity();
   glLightfv(GL_LIGHT0, GL_POSITION, light_pos);
   glPopMatrix();


   myShader->begin();
   //myShader->sendUniform1f("f", f);
 
   primitive(2.0,  0.0, 0.0);
   primitive(0.0,  2.0, 0.0);
   primitive(-2.0,  0.0, 0.0);
   primitive(0.0,  -2.0, 0.0);

   //glRotatef(-90,1.0,1.0,0.0);
   //glutSolidTeapot(1.0);
   glutSolidSphere(0.7,64,64);
   //glutSolidCube(1.2);
   
   //glTranslatef(1.0, 2.0, 3.0);
   //glutSolidSphere(0.2,32,32);

   myShader->end(); 
}


void AppInit(void)
{ 
  glClearColor(0.0f, 0.0f, 1.0f, 0.0f);

  // Load Shaders
  myShader = shadermanager.loadfromFile(VERT_FILE,FRAG_FILE);
   
   if (myShader == 0)
   {
        cout << "Can't create shader object. Exiting now.\n";
        exit(-1);
   }

  //glShadeModel(GL_FLAT);
  glEnable(GL_NORMALIZE);

  // OpenGL Settings
  
  DefaultLighting();
}

//*************************************************************
// use App Exit to clean up
void AppExit(void)
{
  DefaultCleanup();
}


//END