android opengl 怎么渲染文字

android opengl 怎么渲染文字

纹理渲染文本是比什么雪碧文本简单演示使它看起来像,基本思想是使用帆布类来呈现一个位图,然后通过一个OpenGL纹理的位图:

图片内容为：

// Create an empty, mutable bitmap

Bitmap bitmap = Bitmap.createBitmap(256, 256, Bitmap.Config.ARGB_4444);

// get a canvas to paint over the bitmap

Canvas canvas = new Canvas(bitmap);

bitmap.eraseColor(0);

// get a background image from resources

// note the image format must match the bitmap format

Drawable background = context.getResources().getDrawable(R.drawable.background);

background.setBounds(0, 0, 256, 256);

background.draw(canvas); // draw the background to our bitmap

// Draw the text

Paint textPaint = new Paint();

textPaint.setTextSize(32);

textPaint.setAntiAlias(true);

textPaint.setARGB(0xff, 0x00, 0x00, 0x00);

// draw the text centered

canvas.drawText("Hello World", 16,112, textPaint);

//Generate one texture pointer...

gl.glGenTextures(1, textures, 0);

//...and bind it to our array

gl.glBindTexture(GL10.GL_TEXTURE_2D, textures);

//Create Nearest Filtered Texture

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);

//Different possible texture parameters, e.g. GL10.GL_CLAMP_TO_EDGE

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);

//Use the Android GLUtils to specify a two-dimensional texture image from our bitmap

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

//Clean up

bitmap.recycle();