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Viewing changes to glchess/src/lib/scene/opengl/texture.py

  • Committer: Package Import Robot
  • Author(s): Rodrigo Moya
  • Date: 2011-05-30 13:32:04 UTC
  • mfrom: (1.3.4)
  • mto: (163.1.3 precise)
  • mto: This revision was merged to the branch mainline in revision 143.
  • Revision ID: package-import@ubuntu.com-20110530133204-celaq1v1dsxc48q1
Tags: upstream-3.0.2
Import upstream version 3.0.2

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glchess/src/lib/scene/opengl/texture.py
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# -*- coding: utf-8 -*-
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from OpenGL.GL import *
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from OpenGL.GLU import *
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import gtk.gdk
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class Texture:
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    """
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    """
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    def __init__(self, fileName,
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                 ambient  = (0.2, 0.2, 0.2, 1.0),
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                 diffuse  = (0.8, 0.8, 0.8, 1.0),
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                 specular = (0.0, 0.0, 0.0, 1.0),
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                 emission = (0.0, 0.0, 0.0, 1.0),
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                 shininess = 0.0):
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        """Constructor for an openGL texture.
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        'fileName' is the name of the image file to use for the texture (string).
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        An IOError is raised if the file does not exist.
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        This does not need an openGL context.
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        """
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        self.__ambient = ambient
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        self.__diffuse = diffuse
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        self.__specular = specular
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        self.__emission = emission
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        self.__shininess = shininess
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        # OpenGL texture ID
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        self.__texture = None
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        try:
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            self.image = gtk.gdk.pixbuf_new_from_file(fileName);
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        except IOError, e:
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            print 'Error loading texture file: %s: %s' % (fileName, e.strerror)
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            self.image = None
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    def __generate(self):
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        """
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        """
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        if self.__texture is not None:
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            return
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        # Return null texture if failed to load data        
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        if self.image is None:
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            self.__texture = 0
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            return
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        # FIXME: Can fail
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        texture = glGenTextures(1)
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        glBindTexture(GL_TEXTURE_2D, texture)
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        glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
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        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT)
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        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT)
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        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
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        glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
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        format = {1: GL_LUMINANCE, 2: GL_LUMINANCE_ALPHA, 3: GL_RGB, 4: GL_RGBA}[self.image.get_n_channels()]
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        data_type = {1: GL_BITMAP, 8: GL_UNSIGNED_BYTE, 16: GL_UNSIGNED_SHORT}[self.image.get_bits_per_sample()]
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        # Generate mipmaps
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        try:
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            gluBuild2DMipmaps(GL_TEXTURE_2D,
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                              GL_LUMINANCE,
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                              self.image.get_width(),
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                              self.image.get_height(),
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                              format,
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                              data_type,
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                              self.image.get_pixels())
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        except GLUerror, e:
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            glTexImage2D(GL_TEXTURE_2D,
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                         0, # Level
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                         self.image.get_depth(),
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                         self.image.get_width(),
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                         self.image.get_height(),
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                         0, # Border
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                         data_type,
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                         GL_UNSIGNED_BYTE,
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                         self.image.get_pixels())
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        del self.image
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        self.__texture = texture
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    def bind(self):
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        """Bind this texture to the current surface.
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        This requires an openGL context.
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        """
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        self.__generate()
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        # Use texture
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        glBindTexture(GL_TEXTURE_2D, self.__texture)
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        # Use material properties
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        glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, self.__ambient)
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        glMaterialfv(GL_FRONT_AND_BACK, GL_DIFFUSE, self.__diffuse)
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        glMaterialfv(GL_FRONT_AND_BACK, GL_SPECULAR, self.__specular)
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        glMaterialfv(GL_FRONT_AND_BACK, GL_EMISSION, self.__emission)
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        glMaterialf(GL_FRONT_AND_BACK, GL_SHININESS, self.__shininess)