| Line | Revision | Contents |
| 1 | 1 | #! /usr/bin/env python |
| 2 | '''Test of the glDrawPixels function including alpha blending |
|
| 3 | ||
| 4 | Requires: |
|
| 5 | GLUT, PIL, GLUTContext |
|
| 6 | ||
| 7 | You should see a black 128x128 box in the lower-left corner of the screen |
|
| 8 | with the words "Hello From Alpha-ville!" in blue (the background showing |
|
| 9 | through) and a scrawled "regular image stuff" in red (just part of the |
|
| 10 | RGB image). |
|
| 11 | ''' |
|
| 12 | ||
| 13 | from OpenGLContext import testingcontext |
|
| 14 | 296 | BaseContext = testingcontext.getInteractive() |
| 15 | 1 | from OpenGL.GL import * |
| 16 | import string |
|
| 17 | ||
| 18 | class TestContext( BaseContext ): |
|
| 19 | def OnInit( self, ): |
|
| 20 | """Initialisation""" |
|
| 21 | print """Demonstrates drawing a synthetically-generated image |
|
| 22 | ||
| 23 | Note: bitmap is drawn in screen coordinates, so does not |
|
| 24 | respond to moving around or rescaling the window as would |
|
| 25 | a piece of geometry.""" |
|
| 26 | import numpy |
|
| 27 | width,height = 200,50 |
|
| 28 | self.width, self.height, self.data = width,height,numpy.arange( |
|
| 29 | 0, 1.0, 1.0/(width*height*3), |
|
| 30 | dtype='f', |
|
| 31 | ) |
|
| 32 | |
|
| 33 | def Render( self, mode = 0): |
|
| 34 | BaseContext.Render( self, mode ) |
|
| 35 | format = GL_RGB |
|
| 36 | type = GL_FLOAT |
|
| 37 | glPixelStorei(GL_PACK_ALIGNMENT, 1) |
|
| 38 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1) |
|
| 39 | ||
| 40 | width, height = self.getViewPort() |
|
| 41 | glMatrixMode(GL_PROJECTION); |
|
| 42 | # For some reason the GL_PROJECTION_MATRIX is overflowing with a single push! |
|
| 43 | # glPushMatrix() |
|
| 44 | matrix = glGetDouble( GL_PROJECTION_MATRIX ) |
|
| 45 | |
|
| 46 | glLoadIdentity(); |
|
| 47 | glOrtho(0.0, height or 32, 0.0, width or 32, -1.0, 1.0) |
|
| 48 | glMatrixMode(GL_MODELVIEW); |
|
| 49 | glPushMatrix(); |
|
| 50 | glLoadIdentity(); |
|
| 51 | glRasterPos2i(40,40); |
|
| 52 | ||
| 53 | glDrawPixels( |
|
| 54 | self.width, |
|
| 55 | self.height, |
|
| 56 | format, |
|
| 57 | type, |
|
| 58 | self.data, |
|
| 59 | ) |
|
| 60 | |
|
| 61 | glPopMatrix(); |
|
| 62 | glMatrixMode(GL_PROJECTION); |
|
| 63 | # For some reason the GL_PROJECTION_MATRIX is overflowing with a single push! |
|
| 64 | # glPopMatrix(); |
|
| 65 | glLoadMatrixd( matrix ) # should have un-decorated alias for this... |
|
| 66 | |
|
| 67 | glMatrixMode(GL_MODELVIEW); |
|
| 68 | ||
| 69 | def Background(self, mode = 0): |
|
| 70 | '''Clear the background for a particular rendering mode''' |
|
| 71 | glClearColor(0.0,0.0,1.0,1.0) |
|
| 72 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ) |
|
| 73 | |
|
| 74 | if __name__ == "__main__": |
|
| 75 | 296 | TestContext.ContextMainLoop() |
Loggerhead 1.10 is a web-based interface for Bazaar branches