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#! /usr/bin/env python
from __future__ import print_function
import os
if not os.environ.get( 'PYOPENGL_PLATFORM' ):
os.environ['PYOPENGL_PLATFORM'] = 'osmesa'
from math import pi, sin, cos
import OpenGL
OpenGL.USE_ACCELERATE = False
from OpenGL.GL import *
from OpenGL.GL.ARB.fragment_program import glGenProgramsARB
from OpenGL.GLU import *
from OpenGL.osmesa import *
def sphere(radius, slices, stacks):
q = gluNewQuadric()
gluQuadricNormals(q, GLU_SMOOTH)
gluSphere(q, radius, slices, stacks)
gluDeleteQuadric(q)
def cone(base, height, slices, stacks):
q = gluNewQuadric()
gluQuadricDrawStyle(q, GLU_FILL)
gluQuadricNormals(q, GLU_SMOOTH)
gluCylinder(q, base, 0.0, height, slices, stacks)
gluDeleteQuadric(q)
def torus(innerRadius, outerRadius, sides, rings):
ringDelta = 2.0 * pi / rings
sideDelta = 2.0 * pi / sides
theta = 0.0
cosTheta = 1.0
sinTheta = 0.0
for i in range(rings - 1, -1, -1):
theta1 = theta + ringDelta
cosTheta1 = cos(theta1)
sinTheta1 = sin(theta1)
glBegin(GL_QUAD_STRIP)
phi = 0.0
for j in range(sides, -1, -1):
phi += sideDelta
cosPhi = cos(phi)
sinPhi = sin(phi)
dist = outerRadius + innerRadius * cosPhi
glNormal3f(cosTheta1 * cosPhi, -sinTheta1 * cosPhi, sinPhi)
glVertex3f(cosTheta1 * dist, -sinTheta1 * dist, innerRadius * sinPhi)
glNormal3f(cosTheta * cosPhi, -sinTheta * cosPhi, sinPhi)
glVertex3f(cosTheta * dist, -sinTheta * dist, innerRadius * sinPhi)
glEnd()
theta = theta1
cosTheta = cosTheta1
sinTheta = sinTheta1
def render_image():
light_ambient = [0.0, 0.0, 0.0, 1.0]
light_diffuse = [1.0, 1.0, 1.0, 1.0]
light_specular = [1.0, 1.0, 1.0, 1.0]
light_position = [1.0, 1.0, 1.0, 0.0]
red_mat = [1.0, 0.2, 0.2, 1.0]
green_mat = [0.2, 1.0, 0.2, 1.0]
blue_mat = [0.2, 0.2, 1.0, 1.0]
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_LIGHTING)
glEnable(GL_LIGHT0)
glEnable(GL_DEPTH_TEST)
glMatrixMode(GL_PROJECTION)
glLoadIdentity()
glOrtho(-2.5, 2.5, -2.5, 2.5, -10.0, 10.0)
glMatrixMode(GL_MODELVIEW)
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT)
glPushMatrix()
glRotatef(20.0, 1.0, 0.0, 0.0)
glPushMatrix()
glTranslatef(-0.75, 0.5, 0.0)
glRotatef(90.0, 1.0, 0.0, 0.0)
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, red_mat)
torus(0.275, 0.85, 20, 20)
glPopMatrix()
glPushMatrix()
glTranslatef(-0.75, -0.5, 0.0)
glRotatef(270.0, 1.0, 0.0, 0.0)
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, green_mat)
cone(1.0, 2.0, 16, 1)
glPopMatrix()
glPushMatrix()
glTranslatef(0.75, 0.0, -1.0)
glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE, blue_mat)
sphere(1.0, 20, 20)
glPopMatrix()
glPopMatrix()
# This is very important!!!
# Make sure buffered commands are finished!!!
glFinish()
def write_ppm(buf, filename):
f = open(filename, "w")
if f:
h, w, c = buf.shape
print( "P3", file=f)
print( "# ascii ppm file created by osmesa",file=f)
print( "%i %i" % (w, h),file=f)
print("255",file=f)
for y in range(h - 1, -1, -1):
for x in range(w):
pixel = buf[y, x]
l = " %3d %3d %3d" % (pixel[0], pixel[1], pixel[2])
f.write(l)
f.write("\n")
if __name__ == '__main__':
from OpenGL import arrays
ctx = OSMesaCreateContext(OSMESA_RGBA, None)
#ctx = OSMesaCreateContextExt(OSMESA_RGBA, 32, 0, 0, None)
width, height = 400, 400
buf = arrays.GLubyteArray.zeros((height, width, 4))
assert(OSMesaMakeCurrent(ctx, buf, GL_UNSIGNED_BYTE, width, height))
assert(OSMesaGetCurrentContext())
program = glGenProgramsARB(1)
assert(program)
z = glGetIntegerv(GL_DEPTH_BITS)
s = glGetIntegerv(GL_STENCIL_BITS)
a = glGetIntegerv(GL_ACCUM_RED_BITS)
print("OpenGL Version: %s"%(extensions.GLQuerier.getVersion()))
print("Depth=%d Stencil=%d Accum=%d" % (z, s, a))
print("Width=%d Height=%d" % (OSMesaGetIntegerv(OSMESA_WIDTH),
OSMesaGetIntegerv(OSMESA_HEIGHT)))
#OSMesaPixelStore(OSMESA_Y_UP, 0)
render_image()
write_ppm(buf, 'output.ppm')
OSMesaDestroyContext(ctx)
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