#
# gllabel_funcs.py - OpenGL 2.1 functions used by the GLLabel class.
#
# Author: Paul McCarthy <pauldmccarthy@gmail.com>
#
"""This module provides functions which are used by the :class:`.GLLabel`
class to render :class:`.Image` overlays in an OpenGL 2.1 compatible manner.
Rendering of a ``GLLabel`` is very similar to that of a ``GLVolume``, with the
exception that a different fragment shader (``gllabel``) is used. The
``preDraw``, ``draw``, ``drawAll`` and ``postDraw`` functions defined in the
:mod:`.gl21.glvolume_funcs` are re-used by this module.
"""
import numpy as np
import fsleyes.gl.shaders as shaders
from . import glvolume_funcs
[docs]def init(self):
"""Calls the :func:`compileShaders` and :func:`updateShaderState`
functions.
"""
self.shader = None
compileShaders( self)
updateShaderState(self)
[docs]def destroy(self):
"""Destroys the shader programs. """
self.shader.destroy()
self.shader = None
[docs]def compileShaders(self):
"""Loads the vertex/fragment shader source code, and creates a
:class:`.GLSLShader` program.
"""
if self.shader is not None:
self.shader.destroy()
vertSrc = shaders.getVertexShader( 'glvolume')
fragSrc = shaders.getFragmentShader('gllabel')
self.shader = shaders.GLSLShader(vertSrc, fragSrc)
[docs]def updateShaderState(self):
"""Updates all shader program variables. """
if not self.ready():
return
opts = self.opts
shader = self.shader
imageShape = np.array(self.image.shape[:3])
vvx = self.imageTexture.voxValXform
shader.load()
changed = False
changed |= shader.set('numLabels', opts.lut.max() + 1)
changed |= shader.set('imageShape', imageShape)
changed |= shader.set('voxValXform', vvx)
changed |= shader.set('imageTexture', 0)
changed |= shader.set('lutTexture', 1)
shader.unload()
return changed
[docs]def draw2D(self, *args, **kwargs):
"""Draws the label overlay in 2D. See :meth:`.GLObject.draw2D`."""
self.shader.load()
glvolume_funcs.draw2D(self, *args, **kwargs)
self.shader.unloadAtts()
self.shader.unload()
[docs]def drawAll(self, *args, **kwargs):
"""Draws the label overlay in 2D. See :meth:`.GLObject.draw2D`."""
self.shader.load()
glvolume_funcs.drawAll(self, *args, **kwargs)
self.shader.unloadAtts()
self.shader.unload()
[docs]def draw3D(self, *args, **kwargs):
pass