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Diffstat (limited to 'third_party/freetype-py/examples/opengl.py')
| -rw-r--r-- | third_party/freetype-py/examples/opengl.py | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/third_party/freetype-py/examples/opengl.py b/third_party/freetype-py/examples/opengl.py new file mode 100644 index 0000000..19309be --- /dev/null +++ b/third_party/freetype-py/examples/opengl.py @@ -0,0 +1,122 @@ +#!/usr/bin/env python +# -*- coding: utf-8 -*- +# ----------------------------------------------------------------------------- +# +# FreeType high-level python API - Copyright 2011 Nicolas P. Rougier +# Distributed under the terms of the new BSD license. +# +# ----------------------------------------------------------------------------- +import numpy +from freetype import * +import OpenGL.GL as gl +import OpenGL.GLUT as glut + +base, texid = 0, 0 +text = '''Hello World !''' + +def on_display( ): + global texid + gl.glClearColor(1,1,1,1) + gl.glClear(gl.GL_COLOR_BUFFER_BIT | gl.GL_DEPTH_BUFFER_BIT) + gl.glBindTexture( gl.GL_TEXTURE_2D, texid ) + gl.glColor(0,0,0,1) + gl.glPushMatrix( ) + gl.glTranslate( 10, 100, 0 ) + gl.glPushMatrix( ) + gl.glListBase( base+1 ) + gl.glCallLists( [ord(c) for c in text] ) + gl.glPopMatrix( ) + gl.glPopMatrix( ) + glut.glutSwapBuffers( ) + +def on_reshape( width, height ): + gl.glViewport( 0, 0, width, height ) + gl.glMatrixMode( gl.GL_PROJECTION ) + gl.glLoadIdentity( ) + gl.glOrtho( 0, width, 0, height, -1, 1 ) + gl.glMatrixMode( gl.GL_MODELVIEW ) + gl.glLoadIdentity( ) + +def on_keyboard( key, x, y ): + if key == '\033': sys.exit( ) + +def makefont(filename, size): + global texid + + # Load font and check it is monotype + face = Face(filename) + face.set_char_size( size*64 ) + if not face.is_fixed_width: + raise 'Font is not monotype' + + # Determine largest glyph size + width, height, ascender, descender = 0, 0, 0, 0 + for c in range(32,128): + face.load_char( chr(c), FT_LOAD_RENDER | FT_LOAD_FORCE_AUTOHINT ) + bitmap = face.glyph.bitmap + width = max( width, bitmap.width ) + ascender = max( ascender, face.glyph.bitmap_top ) + descender = max( descender, bitmap.rows-face.glyph.bitmap_top ) + height = ascender+descender + + # Generate texture data + Z = numpy.zeros((height*6, width*16), dtype=numpy.ubyte) + for j in range(6): + for i in range(16): + face.load_char(chr(32+j*16+i), FT_LOAD_RENDER | FT_LOAD_FORCE_AUTOHINT ) + bitmap = face.glyph.bitmap + x = i*width + face.glyph.bitmap_left + y = j*height + ascender - face.glyph.bitmap_top + Z[y:y+bitmap.rows,x:x+bitmap.width].flat = bitmap.buffer + + # Bound texture + texid = gl.glGenTextures(1) + gl.glBindTexture( gl.GL_TEXTURE_2D, texid ) + gl.glTexParameterf( gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MAG_FILTER, gl.GL_LINEAR ) + gl.glTexParameterf( gl.GL_TEXTURE_2D, gl.GL_TEXTURE_MIN_FILTER, gl.GL_LINEAR ) + gl.glTexImage2D( gl.GL_TEXTURE_2D, 0, gl.GL_ALPHA, Z.shape[1], Z.shape[0], 0, + gl.GL_ALPHA, gl.GL_UNSIGNED_BYTE, Z ) + + # Generate display lists + dx, dy = width/float(Z.shape[1]), height/float(Z.shape[0]) + base = gl.glGenLists(8*16) + for i in range(8*16): + c = chr(i) + x = i%16 + y = i//16-2 + gl.glNewList(base+i, gl.GL_COMPILE) + if (c == '\n'): + gl.glPopMatrix( ) + gl.glTranslatef( 0, -height, 0 ) + gl.glPushMatrix( ) + elif (c == '\t'): + gl.glTranslatef( 4*width, 0, 0 ) + elif (i >= 32): + gl.glBegin( gl.GL_QUADS ) + gl.glTexCoord2f( (x )*dx, (y+1)*dy ), gl.glVertex( 0, -height ) + gl.glTexCoord2f( (x )*dx, (y )*dy ), gl.glVertex( 0, 0 ) + gl.glTexCoord2f( (x+1)*dx, (y )*dy ), gl.glVertex( width, 0 ) + gl.glTexCoord2f( (x+1)*dx, (y+1)*dy ), gl.glVertex( width, -height ) + gl.glEnd( ) + gl.glTranslatef( width, 0, 0 ) + gl.glEndList( ) + + +if __name__ == '__main__': + import sys + glut.glutInit( sys.argv ) + glut.glutInitDisplayMode( glut.GLUT_DOUBLE | glut.GLUT_RGB | glut.GLUT_DEPTH ) + glut.glutCreateWindow( "Freetype OpenGL" ) + glut.glutReshapeWindow( 600, 100 ) + glut.glutDisplayFunc( on_display ) + glut.glutReshapeFunc( on_reshape ) + glut.glutKeyboardFunc( on_keyboard ) + gl.glTexEnvf( gl.GL_TEXTURE_ENV, gl.GL_TEXTURE_ENV_MODE, gl.GL_MODULATE ) + gl.glEnable( gl.GL_DEPTH_TEST ) + gl.glEnable( gl.GL_BLEND ) + gl.glEnable( gl.GL_COLOR_MATERIAL ) + gl.glColorMaterial( gl.GL_FRONT_AND_BACK, gl.GL_AMBIENT_AND_DIFFUSE ) + gl.glBlendFunc( gl.GL_SRC_ALPHA, gl.GL_ONE_MINUS_SRC_ALPHA ) + gl.glEnable( gl.GL_TEXTURE_2D ) + makefont( './VeraMono.ttf', 64 ) + glut.glutMainLoop( ) |