OpenGLで文字列を描画したく、いろいろ探してみたのですが、みんな苦労しているみたいです。
とりあえずわかったことが２つ、日本語はちょっと難しい。
- まずGLUTを使うやり方
これの場合、日本語は描画できません。ただし簡単に書くことができます
http://d.hatena.ne.jp/osyo-manga/20110827/1314417606
こちらのサイトを参考に
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | -(void)paint{ glClearColor(0.5f, 0.5f, 0.5f, 1.0f); // default background color glClear(GL_COLOR_BUFFER_BIT); [self renderString:@"kana" x:0.5 y:0.5f]; glFlush(); } -(void)renderString:(NSString *)str_ x:(float)x_ y:(float)y_{ glRasterPos2d(x_, y_); const char* charStr=[str_ UTF8String]; int len=(int)[str_ length]; for(int i=0;i<len ;i++){ glutBitmapCharacter(GLUT_BITMAP_TIMES_ROMAN_10, charStr[i]); } } |
- テクスチャを使うやり方
日本語を表示したい場合にはテクスチャを使うみたいです。結構重いとのことなので決まった文字列の場合には画像をそのまま貼付けた方が良さそうです
http://null-null.net/blog/2007/10/566.php
こちらのサイトを参考に
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 | + (void) draw:(NSString *)string_ x:(float)x_ y:(float)y_{ NSAttributedString *attrString; GLuint *texId; glClearColor( 0.0f, 0.0f, 0.0f, 0.0f ); glClearDepth( 1.0f ); glDisable(GL_CULL_FACE); glEnable( GL_BLEND ); glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA ); int i, strSize; NSFont *nsfont; NSDictionary *attrsDictionary; NSAttributedString *singleChar; NSImage **images; NSBitmapImageRep **imageReps; NSImage* img; NSPoint point; NSSize size; int texWidth_=10; int texHeight_=10; // alloc texture id and image buffer strSize = (int)[string_ length]; texId = (GLuint*)malloc( sizeof(GLuint)*strSize ); images = (NSImage**)malloc( sizeof(NSImage*)*strSize ); imageReps = (NSBitmapImageRep**)malloc( sizeof(NSBitmapImageRep*)*strSize ); for( i = 0; i < strSize; i++ ){ images[i] = [[NSImage alloc] initWithSize:NSMakeSize( texWidth_, texHeight_ )]; } // font settings NSSize screenResolution = [[[[NSScreen mainScreen] deviceDescription] objectForKey:NSDeviceResolution] sizeValue]; int fontSize_ = texWidth_ * 72.0/screenResolution.width; nsfont = [NSFont fontWithName:@"HiraKakuPro-W6" size:fontSize_]; attrsDictionary = [NSDictionary dictionaryWithObjectsAndKeys: nsfont, NSFontAttributeName, [NSColor whiteColor], NSForegroundColorAttributeName, [NSColor clearColor], NSBackgroundColorAttributeName, nil ]; // alloc attributed string attrString = [[NSAttributedString alloc] initWithString:string_ attributes:attrsDictionary]; // create texture id glEnable( GL_TEXTURE_2D ); glGenTextures( strSize, texId ); // build texture image for( i = 0; i < strSize; i++ ){ img = images[i]; singleChar = [attrString attributedSubstringFromRange:NSMakeRange(i,1)]; // setting background color [img setBackgroundColor:[NSColor clearColor]]; // calc center position size = [singleChar size]; point = NSMakePoint( (texWidth_-size.width)/2, (texHeight_-size.height)/2 ); // draw character to image [img lockFocus]; [singleChar drawAtPoint:point]; [img unlockFocus]; // alloc bitmap image from NSImage imageReps[i] = [[NSBitmapImageRep alloc] initWithData:[img TIFFRepresentation]]; // texture settings glBindTexture( GL_TEXTURE_2D, texId[i] ); glTexImage2D( GL_TEXTURE_2D, 0, GL_RGBA, texWidth_, texHeight_, 0, [imageReps[i] hasAlpha] ? GL_RGBA :GL_RGB, GL_UNSIGNED_BYTE, [imageReps[i] bitmapData] ); glPixelStorei( GL_UNPACK_ALIGNMENT, 1 ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR ); glTexParameteri( GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR ); glBindTexture( GL_TEXTURE_2D, 0 ); } glDisable( GL_TEXTURE_2D ); // release for( i = 0; i < strSize; i++ ){ [imageReps[i] release]; [images[i] release]; } free( imageReps ); free( images ); strSize = (int)[string_ length]; glEnable( GL_TEXTURE_2D ); for( i = 0; i < strSize; i++ ){ glBindTexture( GL_TEXTURE_2D, texId[i] ); glBegin(GL_POLYGON); float wf_=0.1f; // TODO Viewのサイズからきちんと求める float hf_=0.1f; glColor4f(1.0f, 0.0f, 0.0f, 1.0f); glTexCoord2f( 0, 1 ); glVertex2f( x_+i*wf_, y_ ); glTexCoord2f( 1, 1 ); glVertex2f( x_+(i+1)*wf_, y_ ); glTexCoord2f( 1, 0 ); glVertex2f( x_+(i+1)*wf_, y_+hf_ ); glTexCoord2f( 0, 0 ); glVertex2f( x_+i*wf_, y_+hf_); glEnd(); } glDisable( GL_TEXTURE_2D ); glDeleteTextures((int) [string_ length], texId ); free( texId ); [attrString release]; } |
ちょっといい加減ですがこんな感じ