luni, 21 mai 2012

Python , OpenGL and cube map OpenGL ARB

Today I will show a simple script that uses the OpenGL ARB "Architecture Review Board". The result is show in the next image.
I use just one image file named 111.JPG for all cube images. Let's see the python script.

from OpenGL.GL import *
from OpenGL.GLU import *
from OpenGL.GLUT import *
from OpenGL.GL.ARB.texture_cube_map import *
import Image                
import sys
#after I import all module , I set some vars
angle    = 0.1
texture  = 0
#this var set the type of reflection
reflMode = GL_REFLECTION_MAP_ARB
#this load the texture 
def loadTexture ( fileName ):
    image  = Image.open ( fileName )
    width  = image.size [0]
    height = image.size [1]
    image  = image.tostring ( "raw", "RGBX", 0, -1 )
    
    texture = glGenTextures ( 1 )
    glBindTexture     ( GL_TEXTURE_2D, texture )   
    glPixelStorei     ( GL_UNPACK_ALIGNMENT,1 )
    glTexParameterf   ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT )
    glTexParameterf   ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT )
    glTexParameteri   ( GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_LINEAR )
    glTexParameteri   ( GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_LINEAR_MIPMAP_LINEAR )
    gluBuild2DMipmaps ( GL_TEXTURE_2D, 3, width, height, GL_RGBA, GL_UNSIGNED_BYTE, image )
    
    return texture
#this load a cube map of six images
def loadCubemap ( faces, path = ""  ):
    texture = glGenTextures ( 1 )
    target_map  = GL_TEXTURE_CUBE_MAP_POSITIVE_X_ARB
    glBindTexture     ( GL_TEXTURE_CUBE_MAP_ARB, texture )  
    glPixelStorei     ( GL_PACK_ALIGNMENT,1 )
    glTexParameteri   ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_S,     GL_REPEAT )
    glTexParameteri   ( GL_TEXTURE_2D, GL_TEXTURE_WRAP_T,     GL_REPEAT )
    glTexParameteri   ( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR )
    glTexParameteri   ( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR )
    glEnable          ( GL_TEXTURE_CUBE_MAP_ARB )
       
    for face in faces:
        if path != "":
            file = path + "/" + f
        else:
            file = face
        image  = Image.open ( file )
        width  = image.size [0]
        height = image.size [1]
        image  = image.tostring ( "raw", "RGBX", 0, -1 )
        gluBuild2DMipmaps ( target_map, 3, width, height, GL_RGBA, GL_UNSIGNED_BYTE, image )
        target_map = target_map + 1
    return texture
#this check if is working OpenGL ARB extension 
def extensionInit ():
    if not glInitTextureCubeMapARB ():
        print "ARB_texture_cubemap not working !"
        sys.exit ( 1 )
#this is default init of opengl 
def init ():
    glClearColor ( 1.0, 1.0, 1.0, 0.0 )
    glClearDepth ( 1.0 )                
    glDepthFunc  ( GL_LEQUAL )
    glEnable     ( GL_DEPTH_TEST )
    glHint       ( GL_POLYGON_SMOOTH_HINT,         GL_NICEST )
    glHint       ( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST )
#this help us when resize the window
def reshape ( width, height ):
    glViewport     ( 0, 0, width, height )
    glMatrixMode   ( GL_PROJECTION )
    glLoadIdentity ()
    gluPerspective ( 55.0, float(width)/float (height), 1.0, 60.0 )
    glMatrixMode   ( GL_MODELVIEW )
    glLoadIdentity ()
    gluLookAt      ( 0.0, 6.0, 0.0, 4.0, -4.0, 4.0, 0.0, 0.5, 0.0 )

def display ():
    global texture, reflMode
    
    glClear   ( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT )
    glEnable  ( GL_TEXTURE_CUBE_MAP_ARB )
    glEnable  ( GL_TEXTURE_GEN_S )
    glEnable  ( GL_TEXTURE_GEN_T )
    glEnable  ( GL_TEXTURE_GEN_R )
    glTexGeni ( GL_S, GL_TEXTURE_GEN_MODE, reflMode )
    glTexGeni ( GL_T, GL_TEXTURE_GEN_MODE, reflMode )
    glTexGeni ( GL_R, GL_TEXTURE_GEN_MODE, reflMode )
    
    glBindTexture   ( GL_TEXTURE_CUBE_MAP_ARB, texture )
    glPushMatrix    ()
    glTranslatef    ( 2, 2, 2 )
    glRotatef       ( angle,  0, 10, 0 )
    
    glutSolidTeapot ( 1.5 )
    
    glPopMatrix     ()
    glutSwapBuffers ()
#this test the keyboard
def keyPressed ( *args ):
    global reflMode
    
    key = args [0]
    if key == '\033':
        sys.exit ()
    elif key == 'n' or key == 'N':
        reflMode = GL_NORMAL_MAP_ARB
    elif key == 'r' or key == 'R':
        reflMode = GL_REFLECTION_MAP_ARB
#this will animate , is a idle function
def animate ():
    global angle
    
    angle  = 0.01 * glutGet ( GLUT_ELAPSED_TIME )
   
    glutPostRedisplay ()
#... and the main function
def main ():
    global texture
    
    glutInit               ( sys.argv )
    glutInitDisplayMode    ( GLUT_RGBA | GLUT_DOUBLE | GLUT_DEPTH )
    glutInitWindowSize     ( 600, 400 )
    glutInitWindowPosition ( 0, 0 )
    
    glutCreateWindow ( "ARB_texture_cubemap demo" )
    glutDisplayFunc  ( display )
    glutIdleFunc     ( animate )
    glutReshapeFunc  ( reshape )
    glutKeyboardFunc ( keyPressed )

    init          ()
    extensionInit ();
    
    texture = loadCubemap ( ( "111.JPG", "111.JPG", "111.JPG", "111.JPG", "111.JPG", "111.JPG" ), "" )
    print texture
    glutMainLoop()

print "Hit ESC key to quit."
main()

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