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#####################################################################
# -*- coding: iso-8859-1 -*- #
# #
# Frets on Fire #
# Copyright (C) 2006 Sami Kystil #
# #
# This program is free software; you can redistribute it and/or #
# modify it under the terms of the GNU General Public License #
# as published by the Free Software Foundation; either version 2 #
# of the License, or (at your option) any later version. #
# #
# This program is distributed in the hope that it will be useful, #
# but WITHOUT ANY WARRANTY; without even the implied warranty of #
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
# GNU General Public License for more details. #
# #
# You should have received a copy of the GNU General Public License #
# along with this program; if not, write to the Free Software #
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, #
# MA 02110-1301, USA. #
#####################################################################
from __future__ import division
import Log
import Config
from PIL import Image
import pygame
import StringIO
from OpenGL.GL import *
from OpenGL.GLU import *
class TextureException(Exception):
pass
# A queue containing (function, args) pairs that clean up deleted OpenGL handles.
# The functions are called in the main OpenGL thread.
#stump: Replaced queue with list to avoid deadlocking under
# certain conditions due to a bug in Python.
cleanupQueue = []
class Texture:
"""Represents an OpenGL texture, optionally loaded from disk in any format supported by PIL"""
def __init__(self, name = None, target = GL_TEXTURE_2D):
# Delete all pending textures
try:
func, args = cleanupQueue[0]
del cleanupQueue[0]
func(*args)
except IndexError:
pass
except Exception, e: #MFH - to catch "did you call glewInit?" crashes
Log.error("Texture.py texture deletion exception: %s" % e)
self.texture = glGenTextures(1)
self.texEnv = GL_MODULATE
self.glTarget = target
self.framebuffer = None
self.setDefaults()
self.name = name
if name:
self.loadFile(name)
def loadFile(self, name):
"""Load the texture from disk, using PIL to open the file"""
self.loadImage(Image.open(name))
self.name = name
def loadImage(self, image):
"""Load the texture from a PIL image"""
image = image.transpose(Image.FLIP_TOP_BOTTOM)
if image.mode == "RGBA":
string = image.tostring('raw', 'RGBA', 0, -1)
self.loadRaw(image.size, string, GL_RGBA, 4)
elif image.mode == "RGB":
string = image.tostring('raw', 'RGB', 0, -1)
self.loadRaw(image.size, string, GL_RGB, 3)
elif image.mode == "L":
string = image.tostring('raw', 'L', 0, -1)
self.loadRaw(image.size, string, GL_LUMINANCE, 1)
else:
try:
image = image.convert('RGB')
Log.warn("Unsupported image mode '%s' converted to 'RGB'. May have unexpected results." % image.mode)
string = image.tostring('raw', 'RGB', 0, -1)
self.loadRaw(image.size, string, GL_RGB, 3)
except:
raise TextureException("Unsupported image mode '%s'" % image.mode)
def nextPowerOfTwo(self, n):
m = 1
while m < n:
m <<= 1
return m
def loadSurface(self, surface, monochrome = False, alphaChannel = False):
"""Load the texture from a pygame surface"""
# make it a power of two
self.pixelSize = w, h = surface.get_size()
w2, h2 = [self.nextPowerOfTwo(x) for x in [w, h]]
if w != w2 or h != h2:
s = pygame.Surface((w2, h2), pygame.SRCALPHA, 32)
s.blit(surface, (0, h2 - h))
surface = s
if monochrome:
# pygame doesn't support monochrome, so the fastest way
# appears to be using PIL to do the conversion.
string = pygame.image.tostring(surface, "RGB")
image = Image.fromstring("RGB", surface.get_size(), string).convert("L")
string = image.tostring('raw', 'L', 0, -1)
self.loadRaw(surface.get_size(), string, GL_LUMINANCE, GL_INTENSITY8)
else:
if alphaChannel:
string = pygame.image.tostring(surface, "RGBA", True)
self.loadRaw(surface.get_size(), string, GL_RGBA, 4)
else:
string = pygame.image.tostring(surface, "RGB", True)
self.loadRaw(surface.get_size(), string, GL_RGB, 3)
self.size = (w / w2, h / h2)
def loadSubsurface(self, surface, position = (0, 0), monochrome = False, alphaChannel = False):
"""Load the texture from a pygame surface"""
if monochrome:
# pygame doesn't support monochrome, so the fastest way
# appears to be using PIL to do the conversion.
string = pygame.image.tostring(surface, "RGB")
image = Image.fromstring("RGB", surface.get_size(), string).convert("L")
string = image.tostring('raw', 'L', 0, -1)
self.loadSubRaw(surface.get_size(), position, string, GL_INTENSITY8)
else:
if alphaChannel:
string = pygame.image.tostring(surface, "RGBA", True)
self.loadSubRaw(surface.get_size(), position, string, GL_RGBA)
else:
string = pygame.image.tostring(surface, "RGB", True)
self.loadSubRaw(surface.get_size(), position, string, GL_RGB)
def loadRaw(self, size, string, format, components):
"""Load a raw image from the given string. 'format' is a constant such as
GL_RGB or GL_RGBA that can be passed to gluBuild2DMipmaps.
"""
self.pixelSize = size
self.size = (1.0, 1.0)
self.format = format
self.components = components
(w, h) = size
Texture.bind(self)
glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
gluBuild2DMipmaps(self.glTarget, components, w, h, format, GL_UNSIGNED_BYTE, string)
def loadSubRaw(self, size, position, string, format):
Texture.bind(self)
glPixelStorei(GL_UNPACK_ALIGNMENT, 1)
glTexSubImage2D(self.glTarget, 0, position[0], position[1], size[0], size[1], format, GL_UNSIGNED_BYTE, string)
def loadEmpty(self, size, format):
self.pixelSize = size
self.size = (1.0, 1.0)
self.format = format
Texture.bind(self)
glTexImage2D(GL_TEXTURE_2D, 0, format, size[0], size[1], 0,
format, GL_UNSIGNED_BYTE, "\x00" * (size[0] * size[1] * 4))
def setDefaults(self):
"""Set the default OpenGL options for this texture"""
self.setRepeat()
self.setFilter()
glHint(GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST)
def setRepeat(self, u=GL_REPEAT, v=GL_REPEAT):
Texture.bind(self)
glTexParameteri(self.glTarget, GL_TEXTURE_WRAP_S, u)
glTexParameteri(self.glTarget, GL_TEXTURE_WRAP_T, v)
def setFilter(self, min=GL_LINEAR_MIPMAP_LINEAR, mag=GL_LINEAR):
Texture.bind(self)
glTexParameteri(self.glTarget, GL_TEXTURE_MIN_FILTER, min)
glTexParameteri(self.glTarget, GL_TEXTURE_MAG_FILTER, mag)
def __del__(self):
# Queue this texture to be deleted later
try:
cleanupQueue.append((glDeleteTextures, [self.texture]))
except NameError:
pass
def bind(self, glTarget = None):
"""Bind this texture to self.glTarget in the current OpenGL context"""
if not glTarget:
glTarget = self.glTarget
glBindTexture(glTarget, self.texture)
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, self.texEnv)
#
# Texture atlas
#
TEXTURE_ATLAS_SIZE = 1024
class TextureAtlasFullException(Exception):
pass
class TextureAtlas(object):
def __init__(self, size = TEXTURE_ATLAS_SIZE):
self.texture = Texture()
self.cursor = (0, 0)
self.rowHeight = 0
self.surfaceCount = 0
self.texture.loadEmpty((size, size), GL_RGBA)
def add(self, surface, margin = 0):
w, h = surface.get_size()
x, y = self.cursor
w += margin
h += margin
if w > self.texture.pixelSize[0] or h > self.texture.pixelSize[1]:
raise ValueError("Surface is too big to fit into atlas.")
if x + w >= self.texture.pixelSize[0]:
x = 0
y += self.rowHeight
self.rowHeight = 0
if y + h >= self.texture.pixelSize[1]:
Log.debug("Texture atlas %s full after %d surfaces." % (self.texture.pixelSize, self.surfaceCount))
raise TextureAtlasFullException()
self.texture.loadSubsurface(surface, position = (x, y), alphaChannel = True)
self.surfaceCount += 1
self.rowHeight = max(self.rowHeight, h)
self.cursor = (x + w, y + h)
# Return the coordinates for the uploaded texture patch
w -= margin
h -= margin
return x / float(self.texture.pixelSize[0]), y / float(self.texture.pixelSize[1]), \
(x + w) / float(self.texture.pixelSize[0]), (y + h) / float(self.texture.pixelSize[1])
def bind(self):
self.texture.bind()
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