libGdx自己传入顶点绘制纹理

写shader
1.vertex

attribute vec4 a_position;
attribute vec4 a_color;
attribute vec2 a_texCoord0;
attribute vec2 a_texCoord1;
varying vec4 v_color;
uniform mat4 u_projTrans;
varying vec2 v_textCoords;
varying vec2 v_textCoords1;

void main() {
    v_color = a_color;
    v_color.a = v_color.a * (255.0/254.0);
    v_textCoords = a_texCoord0;
    v_textCoords1 = a_texCoord1;
    gl_Position = u_projTrans * a_position;
}

• frag

#ifdef GL_ES
precision mediump float;
#endif


//input from vertex shader
varying vec4 v_color;
uniform vec4 v_color1;
varying vec2 v_textCoords;
uniform sampler2D u_texture;
uniform sampler2D u_texture2;
uniform float time;
varying vec2 v_textCoords1;

void main() {
    vec4 tempColor = texture2D(u_texture, v_textCoords);
    vec4 tempColor2 = texture2D(u_texture2, v_textCoords1);

    //        vec4 tempHuang = vec4(229.0F/255, 208.0F/255, 190.0F/255,1);
    //        tempHuang.a = 1.0-time*0.4;
//    gl_FragColor = vec4(tempColor.rgb,v_textCoords1.x * 1+0.5); //+ tempHuang;
    gl_FragColor = mix(tempColor2,tempColor,0.5);
}

3.绘制代码

      float arr[] = new float[]{
              0.0f, 1.0f,
              0.0f, 0.0f,
              1.0f, 0.0f,
              1.0f, 1.0f,

      };
      ByteBuffer byteBuffer = ByteBuffer.allocateDirect(4*2*4);
      byteBuffer.order(ByteOrder.nativeOrder());
      floatBuffer = byteBuffer.asFloatBuffer();
      floatBuffer.put(arr);


      texture = Asset.getAsset().getTexture("1234.png");
      if (shadowProgram == null) {
         shadowProgram = new ShaderProgram(
                 Gdx.files.internal("shader/hui.vert"),
                 Gdx.files.internal("shader/Demo8.frag"));
      }




      Image group = new Image(new Texture("bgTest.png")){
         private float time = 0;
         @Override
         public void act(float delta) {
            super.act(delta);
            time+=delta;
         }

         @Override
         public void draw(Batch batch, float parentAlpha) {
            if (shadowProgram!=null) {
               batch.setShader(shadowProgram);
               int timeLocation = shadowProgram.getUniformLocation("time");
               int u_t = shadowProgram.getUniformLocation("u_texture2");
               int v_color1 = shadowProgram.getUniformLocation("v_color1");
               Gdx.gl.glActiveTexture(GL20.GL_TEXTURE1);
               texture.bind();
               shadowProgram.setUniformi(u_t,1);
               int a_texCoord1 = shadowProgram.getAttributeLocation("a_texCoord1");
               shadowProgram.enableVertexAttribute(a_texCoord1);
               floatBuffer.position(0);
               shadowProgram.setVertexAttribute(a_texCoord1,2,Gdx.gl20.GL_FLOAT,false,0,floatBuffer);

               Gdx.gl.glActiveTexture(GL20.GL_TEXTURE0);
               shadowProgram.setUniformf(v_color1,1,1,1,1);
               shadowProgram.setUniformf(timeLocation,time*1F);
               super.draw(batch, parentAlpha);
               batch.setShader(null);
            }else {
               super.draw(batch, parentAlpha);
            }
         }
      };
//        Image image = new Image(Asset.getAsset().getTexture("1234.png"));
//        addActor(image);
//        image.setSize(group.getWidth(),group.getHeight());
      group.setPosition(0,0);
      addActor(group);