java - libgdx - 尝试使用 ShapeRenderer 时出错

Question

我正在尝试使用带有此代码的 ShapeRenderer 来实现淡入淡出效果:

            Gdx.gl.glEnable(GL20.GL_BLEND);
            Gdx.gl20.glBlendFunc(GL20.GL_ALPHA, GL20.GL_ONE_MINUS_SRC_ALPHA);
            //ShaderProgram.pedantic = false;

            shapeRenderer.setProjectionMatrix(stage.getCamera().combined);
            shapeRenderer.begin(ShapeRenderer.ShapeType.Filled);
            shapeRenderer.setColor(new Color(0,0,0,fadeTimeElapsed/1.5f));
            shapeRenderer.rect(0,0,Gdx.graphics.getWidth(),Gdx.graphics.getHeight());
            shapeRenderer.end();

            Gdx.gl20.glDisable(GL20.GL_BLEND);

我得到以下异常:

FATAL EXCEPTION: GLThread 2715 java.lang.IllegalArgumentException: no uniform with name 'u_projModelView' in shader at com.badlogic.gdx.graphics.glutils.ShaderProgram.fetchUniformLocation(ShaderProgram.java:287) at com.badlogic.gdx.graphics.glutils.ShaderProgram.fetchUniformLocation(ShaderProgram.java:277) at com.badlogic.gdx.graphics.glutils.ShaderProgram.setUniformMatrix(ShaderProgram.java:507) at com.badlogic.gdx.graphics.glutils.ShaderProgram.setUniformMatrix(ShaderProgram.java:498) at com.badlogic.gdx.graphics.glutils.ImmediateModeRenderer20.flush(ImmediateModeRenderer20.java:147) at com.badlogic.gdx.graphics.glutils.ImmediateModeRenderer20.end(ImmediateModeRenderer20.java:160) at com.badlogic.gdx.graphics.glutils.ShapeRenderer.end(ShapeRenderer.java:1104) at net.ukk.rpg.Level.render(Level.java:93) at com.badlogic.gdx.Game.render(Game.java:46) at com.badlogic.gdx.backends.android.AndroidGraphics.onDrawFrame(AndroidGraphics.java:422) at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1542) at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1266)

顺便说一句，对于 ShaderProgram.pedantic=false，我没有得到任何填充的矩形。提前致谢。

Answer 1

问题是我在线程中实例化 ShapeRenderer。在 show() 方法中调用构造函数解决了这个问题。