[Android/안드로이드] OpenGL Text 출력하기. ( with sample code )

안녕하세요 돼지왕 왕돼지입니다.
 
안드로이드에서 OpenGL 을 사용하여 Text 를 출력할 일이 많으시죠?
 
어떤 방법으로 하면 될까 샘플코드와 함께 알아보시죠.

Text Bitmap 만들기.

Bitmap bitmap = Bitmap.createBitmap( 64, 64, Bitmap.Config.ARGB_4444 );

Canvas canvas = new Canvas( bitmap );

bitmap.eraseColor( 0 );

Paint textPaint = new Paint();

textPaint.setTextSize( 18 );

textPaint.setAntiAlias( true );

textPaint.setARGB( 0xff, 0xff, 0xff, 0xff );

textPaint.setTextAlign( Paint.Align.LEFT );

textPaint.setTextScaleX( 0.5f );

canvas.drawText( str, 0.f, 15.f , textPaint);

Bitmap Texture 에 bind 하기.

gl.glGenTextures( 1, mTextures, 0 );

gl.glBindTexture( GL10.GL_TEXTURE_2D, mTextures[ 0 ] );

gl.glTexParameterf( GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MIN_FILTER, GL10.GL_NEAREST );

gl.glTexParameterf( GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_MAG_FILTER, GL10.GL_LINEAR );

gl.glTexParameterf( GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_S, GL10.GL_REPEAT );

gl.glTexParameterf( GL10.GL_TEXTURE_2D, GL10.GL_TEXTURE_WRAP_T, GL10.GL_REPEAT );

GLUtils.texImage2D( GL10.GL_TEXTURE_2D, 0, bitmap, 0 );

bitmap.recycle();

Texture 입히기.

gl.glEnableClientState( GL10.GL_VERTEX_ARRAY );

gl.glEnableClientState( GL10.GL_TEXTURE_COORD_ARRAY );

gl.glVertexPointer( NUMBER_OF_AXIS, GL10.GL_FLOAT, 0, mImageRectVertexBuffer );
gl.glBindTexture( GL10.GL_TEXTURE_2D, mTextures[ 0 ] );  

gl.glTexCoordPointer( 2, GL10.GL_FLOAT, 0, mUVBuffer );

gl.glDrawElements( GL10.GL_TRIANGLES, INDICES.length, GL10.GL_UNSIGNED_SHORT, mIndicesBuffer );

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