| Line | Revision | Contents |
| 1 | 1 | #! /usr/bin/env python |
| 2 | '''Test of the glDrawPixels function including alpha blending |
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| 3 | ||
| 4 | Requires: |
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| 5 | 310 | GLUT, PIL, GLUTContext |
| 6 | 1 | |
| 7 | You should see a black 128x128 box in the lower-left corner of the screen |
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| 8 | with the words "Hello From Alpha-ville!" in blue (the background showing |
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| 9 | through) and a scrawled "regular image stuff" in red (just part of the |
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| 10 | RGB image). |
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| 11 | ''' |
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| 12 | ||
| 13 | from OpenGLContext import testingcontext |
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| 14 | 296 | BaseContext = testingcontext.getInteractive() |
| 15 | 1 | from OpenGL.GL import * |
| 16 | import string |
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| 17 | ||
| 18 | class TestContext( BaseContext ): |
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| 19 | 310 | def loadImage( self, imageName = 'gldrawpixels.png' ): |
| 20 | """Load an image from a file using PIL. |
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| 21 | This is closer to what you really want to do than the |
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| 22 | original port's crammed-together stuff that set global |
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| 23 | state in the loading method. Note the process of binding |
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| 24 | the texture to an ID then loading the texture into memory. |
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| 25 | This didn't seem clear to me somehow in the tutorial. |
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| 26 | """ |
|
| 27 | try: |
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| 28 | from PIL.Image import open |
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| 29 | except ImportError, err: |
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| 30 | from Image import open |
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| 31 | im = open(imageName) |
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| 32 | try: |
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| 33 | ix, iy, image = im.size[0], im.size[1], im.tostring("raw", "RGBA", 0, -1) |
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| 34 | except SystemError: |
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| 35 | ix, iy, image = im.size[0], im.size[1], im.tostring("raw", "RGBX", 0, -1) |
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| 36 | return ix,iy, image |
|
| 37 | def OnInit( self, ): |
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| 38 | """Initialisation""" |
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| 39 | print """Should see black bitmap/square in lower left quadrant over blue background |
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| 40 | 1 | Should see scrawled "regular image stuff" at top of black square. |
| 41 | Should see typed "Hello From Alpha-ville" in the middle of the |
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| 42 | black square. |
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| 43 | ||
| 44 | 310 | Note: bitmap is drawn in screen coordinates, so does not |
| 45 | respond to moving around or rescaling the window as would |
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| 46 | a piece of geometry.""" |
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| 47 | self.width, self.height, self.data = self.loadImage() |
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| 48 | |
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| 49 | def Render( self, mode = 0): |
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| 50 | BaseContext.Render( self, mode ) |
|
| 51 | format = GL_RGBA |
|
| 52 | type = GL_UNSIGNED_BYTE |
|
| 53 | glEnable(GL_ALPHA_TEST); |
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| 54 | glAlphaFunc(GL_GREATER,0); |
|
| 55 | 1 | ## glEnable(GL_BLEND); |
| 56 | ## glBlendFunc(GL_SRC_ALPHA,GL_ONE_MINUS_SRC_ALPHA); |
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| 57 | 310 | glPixelStorei(GL_PACK_ALIGNMENT, 1) |
| 58 | glPixelStorei(GL_UNPACK_ALIGNMENT, 1) |
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| 59 | ||
| 60 | width, height = self.getViewPort() |
|
| 61 | glMatrixMode(GL_PROJECTION); |
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| 62 | # For some reason the GL_PROJECTION_MATRIX is overflowing with a single push! |
|
| 63 | # glPushMatrix() |
|
| 64 | matrix = glGetDouble( GL_PROJECTION_MATRIX ) |
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| 65 | |
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| 66 | glLoadIdentity(); |
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| 67 | glOrtho(0.0, height or 32, 0.0, width or 32, -1.0, 1.0) |
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| 68 | glMatrixMode(GL_MODELVIEW); |
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| 69 | glPushMatrix(); |
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| 70 | glLoadIdentity(); |
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| 71 | glRasterPos2i(40,40); |
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| 72 | ||
| 73 | glDrawPixels( |
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| 74 | self.width, |
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| 75 | self.height, |
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| 76 | format, |
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| 77 | type, |
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| 78 | self.data, |
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| 79 | ) |
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| 80 | |
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| 81 | glPopMatrix(); |
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| 82 | glMatrixMode(GL_PROJECTION); |
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| 83 | # For some reason the GL_PROJECTION_MATRIX is overflowing with a single push! |
|
| 84 | # glPopMatrix(); |
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| 85 | glLoadMatrixd( matrix ) # should have un-decorated alias for this... |
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| 86 | |
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| 87 | glMatrixMode(GL_MODELVIEW); |
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| 88 | ||
| 89 | def Background(self, mode = 0): |
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| 90 | '''Clear the background for a particular rendering mode''' |
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| 91 | glClearColor(0.0,0.0,1.0,1.0) |
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| 92 | glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT ) |
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| 93 | |
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| 94 | 1 | if __name__ == "__main__": |
| 95 | 310 | TestContext.ContextMainLoop() |
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