Daviddoria: Created page with '==Alpha.cxx== #include #include using namespace std; void display(); void LookAt(); void DrawSphere(const float radius, const float alp…'

2010-11-24T00:37:21Z

Created page with '==Alpha.cxx== <source lang="cpp"> #include <iostream> #include <glut.h> using namespace std; void display(); void LookAt(); void DrawSphere(const float radius, const float alp…'

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==Alpha.cxx==
<source lang="cpp">
#include <iostream>
#include <glut.h>

using namespace std;

void display();
void LookAt();

void DrawSphere(const float radius, const float alpha);

const int WindowHeight = 1000;
const int WindowWidth = 1000;

void AmbientLighting();
void PointLight(const float x, const float y, const float z, const float amb, const float diff, const float spec);

int main(int argc, char *argv[])
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(WindowWidth, WindowHeight);
glutInitWindowPosition(0, 0);

glutCreateWindow("Picking Example");

glutDisplayFunc(display);

AmbientLighting();
PointLight(1,1,1, 0, 1, 1);

LookAt();

glEnable (GL_BLEND);
glBlendFunc (GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
//glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);

glutMainLoop();
return 0;
}

void DrawSphere(const float radius, const float alpha)
{
glColorMaterial ( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE ) ;
glEnable ( GL_COLOR_MATERIAL ) ;
glColor4f(1.0f, 0.0f, 0.0f, alpha);
//glColor4f(0.0f, 0.0f, 0.0f, alpha);

GLfloat greenEmissiveMaterial[] = {0.0, 1.0, 0.0};
glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, greenEmissiveMaterial);

GLUquadricObj *quadratic;
quadratic = gluNewQuadric();
gluQuadricNormals(quadratic, GLU_SMOOTH);

gluSphere(quadratic, radius, 32, 32);
}

void LookAt()
{
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(70, 1, 1, 100);

glMatrixMode(GL_MODELVIEW);
glLoadIdentity();

gluLookAt(2, 2, 10, 2, 0, 0, 0, 1, 0);

}

void display()
{
//MUST do these
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glEnable(GL_DEPTH_TEST);

DrawSphere(1, 1);
DrawSphere(1.2, .5);
DrawSphere(1.4, .2);

glutSwapBuffers();
}

void AmbientLighting()
{
glEnable(GL_LIGHTING);

double amb = .3;
GLfloat global_ambient[] = {amb,amb,amb, 0.1};
glLightModelfv(GL_LIGHT_MODEL_AMBIENT, global_ambient);

}

void PointLight(const float x, const float y, const float z, const float amb, const float diff, const float spec)
{
glEnable(GL_LIGHTING);

/*
GLfloat light_ambient[] = { 0.0, 0.0, 0.0, 1.0 };
GLfloat light_diffuse[] = { 1.0, 1.0, 1.0, 1.0 };
GLfloat light_specular[] = { 1.0, 1.0, 1.0, 1.0 };
*/
GLfloat light_ambient[] = { amb,amb,amb, 1.0 };
GLfloat light_diffuse[] = {diff, diff, diff, 1.0 };
GLfloat light_specular[] = {spec, spec, spec, 1.0 };

GLfloat light_position[] = {x,y,z, 0.0 };

glLightfv(GL_LIGHT0, GL_AMBIENT, light_ambient);
glLightfv(GL_LIGHT0, GL_DIFFUSE, light_diffuse);
glLightfv(GL_LIGHT0, GL_SPECULAR, light_specular);
glLightfv(GL_LIGHT0, GL_POSITION, light_position);

glEnable(GL_LIGHT0); //enable the light after setting the properties

}
</source>

==CMakeLists.txt==
<source lang="cmake">
cmake_minimum_required(VERSION 2.6)

PROJECT(OpenGLAlpha)

set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fopenmp") #g++

INCLUDE_DIRECTORIES(/usr/include/GL/)

LINK_DIRECTORIES(/usr/lib)

ADD_EXECUTABLE(Alpha Alpha.cpp)

TARGET_LINK_LIBRARIES(Alpha glut GLU GL Xmu X11)

</source>

OpenGL/Alpha - Revision history

Daviddoria: Created page with '==Alpha.cxx== #include #include using namespace std; void display(); void LookAt(); void DrawSphere(const float radius, const float alp…'