103 lines
3.7 KiB
Python
103 lines
3.7 KiB
Python
# -*- coding: utf-8 -*-
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from OpenGL.GL import *
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from .. GLGraphicsItem import GLGraphicsItem
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__all__ = ['GLImageItem']
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class GLImageItem(GLGraphicsItem):
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"""
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**Bases:** :class:`GLGraphicsItem <pyqtgraph.opengl.GLGraphicsItem>`
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Displays image data as a textured quad.
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"""
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def __init__(self, data, smooth=False, glOptions='translucent'):
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"""
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============== =======================================================================================
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**Arguments:**
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data Volume data to be rendered. *Must* be 3D numpy array (x, y, RGBA) with dtype=ubyte.
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(See functions.makeRGBA)
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smooth (bool) If True, the volume slices are rendered with linear interpolation
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============== =======================================================================================
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"""
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self.smooth = smooth
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self._needUpdate = False
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GLGraphicsItem.__init__(self)
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self.setData(data)
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self.setGLOptions(glOptions)
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self.texture = None
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def initializeGL(self):
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if self.texture is not None:
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return
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glEnable(GL_TEXTURE_2D)
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self.texture = glGenTextures(1)
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def setData(self, data):
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self.data = data
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self._needUpdate = True
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self.update()
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def _updateTexture(self):
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glBindTexture(GL_TEXTURE_2D, self.texture)
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if self.smooth:
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR)
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else:
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_BORDER)
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_BORDER)
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#glTexParameteri(GL_TEXTURE_3D, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_BORDER)
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shape = self.data.shape
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## Test texture dimensions first
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glTexImage2D(GL_PROXY_TEXTURE_2D, 0, GL_RGBA, shape[0], shape[1], 0, GL_RGBA, GL_UNSIGNED_BYTE, None)
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if glGetTexLevelParameteriv(GL_PROXY_TEXTURE_2D, 0, GL_TEXTURE_WIDTH) == 0:
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raise Exception("OpenGL failed to create 2D texture (%dx%d); too large for this hardware." % shape[:2])
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glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, shape[0], shape[1], 0, GL_RGBA, GL_UNSIGNED_BYTE, self.data.transpose((1,0,2)))
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glDisable(GL_TEXTURE_2D)
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#self.lists = {}
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#for ax in [0,1,2]:
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#for d in [-1, 1]:
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#l = glGenLists(1)
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#self.lists[(ax,d)] = l
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#glNewList(l, GL_COMPILE)
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#self.drawVolume(ax, d)
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#glEndList()
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def paint(self):
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if self._needUpdate:
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self._updateTexture()
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self._needUpdate = False
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glEnable(GL_TEXTURE_2D)
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glBindTexture(GL_TEXTURE_2D, self.texture)
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self.setupGLState()
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#glEnable(GL_DEPTH_TEST)
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##glDisable(GL_CULL_FACE)
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#glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
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#glEnable( GL_BLEND )
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#glEnable( GL_ALPHA_TEST )
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glColor4f(1,1,1,1)
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glBegin(GL_QUADS)
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glTexCoord2f(0,0)
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glVertex3f(0,0,0)
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glTexCoord2f(1,0)
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glVertex3f(self.data.shape[0], 0, 0)
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glTexCoord2f(1,1)
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glVertex3f(self.data.shape[0], self.data.shape[1], 0)
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glTexCoord2f(0,1)
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glVertex3f(0, self.data.shape[1], 0)
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glEnd()
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glDisable(GL_TEXTURE_2D)
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