OpenGL ES 2.0 中用于多个对象的一对着色器

Question

android 应用程序中有许多简单相似的 3D 对象。为了初始化不会花费很长时间，对于我使用一对着色器（一个链接程序）的所有对象，例如：

public class SceneRenderer implements GLSurfaceView.Renderer {
    
    private final int NUMBER = 400;
    private Object3D[] objects = new Object3D[NUMBER];
    
    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config {
        LinkedProgram program = new LinkedProgram(vShader, fShader);
        int programObject = program.get();
        ...
        for (int i = 0; i < NUMBER; i++) {
            // use one program for all objects
            objects[i] = new Object3D(programObject);
        }
    }

    ...
    @Override
    public void onDrawFrame(GL10 gl) {
        GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, VBO[0]);
        for (int i = 0; i < NUMBER; i++) {
            objects[i].draw(); // draw all objects
        }
        GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
    }
}

每个 3D 对象使用相同的编译程序：

public class Object3D {
    ...
    public Object3D(int programObject) {
        this.programObject = programObject;
        mvpMatrixLink = GLES20.glGetUniformLocation(programObject, "mvp_matrix");
        colorLink = GLES20.glGetUniformLocation(programObject, "v_color");
        positionLink = GLES20.glGetAttribLocation(programObject, "a_position");
    }

    public draw() {
        GLES20.glUseProgram(programObject);
        GLES20.glUniformMatrix4fv(mvpMatrixLink, 1, false, mvpMatrix, 0);
        GLES20.glEnableVertexAttribArray(positionLink);
        GLES20.glVertexAttribPointer(positionLink, 3, GLES20.GL_FLOAT,
        false, 12, 0);
        GLES20.glUniform4fv(colorLink, 1, color, 0);
        ... // draw current 3D-object
    }
}

效果很好 - 初始化速度更快。但是我有一个问题：使用这种方法安全吗？或者每个 3D 对象都应该有自己的编译程序？

感谢您的任何 comment/answer！

Answer 1

is it safe to use this approach? Or should each 3D-object have its own compiled program?

是的，很安全。您绝对应该继续这样做，这样做有很多好处（减少加载时间、减少内存占用、减少状态更改将减少帧时间）。

OpenGL ES 2.0 中用于多个对象的一对着色器

One pair of shaders for several objects in OpenGL ES 2.0

performance

shader

android

opengl-es

opengl-es-2.0