/**
* Sets up the SpriteBatch for drawing. This will disable depth buffer writting. It enables
* blending and texturing. If you have more texture units enabled than the first one you have to
* disable them before calling this. Uses a screen coordinate system by default where everything
* is given in pixels. You can specify your own projection and modelview matrices via {@link
* #setProjectionMatrix(Matrix4)} and {@link #setTransformMatrix(Matrix4)}.
*/
public void begin() {
if (drawing) throw new IllegalStateException("you have to call SpriteBatch.end() first");
renderCalls = 0;
Gdx.gl.glDepthMask(false);
if (Gdx.graphics.isGL20Available()) {
if (customShader != null) customShader.begin();
else shader.begin();
} else {
Gdx.gl.glEnable(GL10.GL_TEXTURE_2D);
}
setupMatrices();
idx = 0;
lastTexture = null;
drawing = true;
}
/**
* Sets the transform matrix to be used by this SpriteBatch. If this is called inside a {@link
* #begin()}/{@link #end()} block. the current batch is flushed to the gpu.
*
* @param transform the transform matrix
*/
public void setTransformMatrix(Matrix4 transform) {
if (drawing) flush();
transformMatrix.set(transform);
if (drawing) setupMatrices();
}
/**
* Sets the projection matrix to be used by this SpriteBatch. If this is called inside a {@link
* #begin()}/{@link #end()} block. the current batch is flushed to the gpu.
*
* @param projection the projection matrix
*/
public void setProjectionMatrix(Matrix4 projection) {
if (drawing) flush();
projectionMatrix.set(projection);
if (drawing) setupMatrices();
}
