Android 如何将 OpenGL ES 1.0 代码转换为 OpenGL Es 2.0？

Question

我有一个用 OpenGL ES 1.0 编写的代码，使用 GL_LINE_STRIP 绘制一条 20 点的线。我想将代码升级到 OpenGL ES 2.0。代码在3 类:
mainActivity
MyGLRenderer
Shape

我该怎么办？如何设置fragShader和vertShader等？请帮助
代码如下：
mainActivity=

public class mainActivuty extends Activity {
    private GLSurfaceView surface;
    public void onCreate(Bundle bundle) {
        super.onCreate(bundle);
        surface = new GLSurfaceView(this);
        surface.setEGLContextClientVersion(1);
        surface.setRenderer(new MyGLRenderer());

        setContentView(surface);
    }

    public void onPause(){
        super.onPause();
        surface.onPause();      
    }

    public void onResume() {
        super.onResume();
        surface.onResume();
    }
}

MyGLRenderer=

public class MyGLRenderer implements Renderer {
    Shape s;

    public MyGLRenderer() {
        s = new Shape();
    }

    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
        gl.glClearColor(0.0f, 0.0f, 0.5f, 0.5f);
    }

    public void onDrawFrame(GL10 gl) {
        gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
        gl.glLoadIdentity();
        gl.glTranslatef(0, 0, -8);
        s.draw(gl);
    }

    public void onSurfaceChanged(GL10 gl, int width, int height) {
        gl.glViewport(0, 0, width, height);
        gl.glMatrixMode(GL10.GL_PROJECTION);
        gl.glLoadIdentity();
        GLU.gluPerspective(gl, 45.0f, (float) width / (float) height, 0.1f,
                100.0f);
        gl.glMatrixMode(GL10.GL_MODELVIEW);
        gl.glLoadIdentity();
    }

    @Override
    public void onSurfaceCreated(GL10 arg0, javax.microedition.khronos.egl.EGLConfig arg1) {
        // TODO Auto-generated method stub

    }
}

和形状=

public class Shape {

    float vertices[] =  {
            -3.14f, -0.00159265f, 0f,
            -2.826f, -0.31038f, 0f,
            -2.512f, -0.588816f, 0f,
            -2.198f, -0.809672f, 0f,
            -1.884f, -0.951351f, 0f,
            -1.57f, -1f, 0f,
            -1.256f, -0.950859f, 0f,
            -0.942f, -0.808736f, 0f,
            -0.628f, -0.587528f, 0f,
            -0.314f, -0.308866f, 0f,
            0f, 0f, 0f,
            0.314f, 0.308866f, 0f,
            0.628f, 0.587528f, 0f,
            0.942f, 0.808736f, 0f,
            1.256f, 0.950859f, 0f,
            1.57f, 1f, 0f,
            1.884f, 0.951351f, 0f,
            2.198f, 0.809672f, 0f,
            2.512f, 0.588816f, 0f,
            2.826f, 0.31038f, 0f,
            3.14f, 0.00159265f, 0f
            }; 
            private short[] indices = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20};

            FloatBuffer vertexBuffer;
            ShortBuffer indexBuffer;
            public Shape() {
            ByteBuffer bb = ByteBuffer.allocateDirect(vertices.length * 4);
            bb.order(ByteOrder.nativeOrder());
            vertexBuffer = bb.asFloatBuffer();
            vertexBuffer.put(vertices);
            vertexBuffer.position(0);

            ByteBuffer bb2=ByteBuffer.allocateDirect(indices.length*2);
            bb2.order(ByteOrder.nativeOrder());
            indexBuffer=bb2.asShortBuffer();
            indexBuffer.put(indices);
            indexBuffer.position(0);
            }

            public void draw(GL10 gl) {
            gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
            gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
            gl.glDrawElements(GL10.GL_LINE_STRIP,indices.length,GL10.GL_UNSIGNED_SHORT,indexBuffer);
            gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
            }

}

坦克斯

Answer 1

ES1.x和ES2.x是截然不同的。如果您正在画一条线并且 ES1 对您来说已经足够，那么我的建议是 "don't convert it".

如果这不可能，那么我建议您在 ES2 中开始一个新的 project/module 并使用一些教程来帮助您完成整个过程。从您发布的内容来看，这应该足够快了。

然后只需修改教程项目来执行您需要的操作，或者开始将逻辑从教程复制到您的案例以进行转换。

根据您的代码，一些方法可能已更改，但通常您需要做的是：

添加着色器（代码、编译和使用）
将矩阵方法移动到着色器中（矩阵不在 GL 中，因此您需要使用其他方法）
将指针和客户端状态转换为对应于着色器属性
在着色器中添加其他参数，例如颜色

Answer 2

有很多方法可以记下这段代码。这是我以前遇到这个问题时的建议。
您的 mainActivity 不需要太多更改。只是您必须通过更改此行将您的 OpenGL ES 版本更改为 2.0 版： surface.setEGLContextClientVersion(2);

正如您提到的，您还需要两个 classes。 MyGLRenderer 和 Shape 我会在这里 Renderer 和 Shader clasees。您的 Shader class 应该有 vertcode 字符串和 fragcode 字符串。你的 Shader class 应该是这样的：

public class Shader {

    private final static String vertcode = "attribute vec4 a_pos;"+
            "void main(){"+
            "gl_Position = a_pos;" +
            "}";

    private final static String fragcode = "precision mediump float;" +
            "uniform vec4 u_color;"+
            "void main(){"+
            "gl_FragColor = u_color;"+
            "}";

    private static int program;
    public static int positionhandle;
    public static int colorhandle;

    public static void makeprogram()
    {
        int vertexShader   = loadShader(GLES20.GL_VERTEX_SHADER, vertcode);
        int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragcode);

        program = GLES20.glCreateProgram();

        GLES20.glAttachShader(program, vertexShader);
        GLES20.glAttachShader(program, fragmentShader);

        GLES20.glLinkProgram(program);

        positionhandle = GLES20.glGetAttribLocation(program,"a_pos");
        colorhandle = GLES20.glGetUniformLocation(program, "u_color");


        GLES20.glUseProgram(program);

    }

    private static int loadShader(int type, String shadertext)
    {
        int shader = GLES20.glCreateShader(type);
        GLES20.glShaderSource(shader, shadertext);
        GLES20.glCompileShader(shader);
        return shader;
    }

}

现在您必须设置您的 Renderer class，包括您的积分。 public

class Renderer implements GLSurfaceView.Renderer {

    private FloatBuffer vertbuffer;

    @Override
    public void onSurfaceCreated(GL10 gl, EGLConfig config) {
        tut1.Shader.makeprogram();
        GLES20.glEnableVertexAttribArray(tut1.Shader.positionhandle);
        float[] verts = {-3.14f, -0.00159265f, 0f,
        -2.826f, -0.31038f, 0f,
        -2.512f, -0.588816f, 0f,
        -2.198f, -0.809672f, 0f,
        -1.884f, -0.951351f, 0f,
        -1.57f, -1f, 0f,
        -1.256f, -0.950859f, 0f,
        -0.942f, -0.808736f, 0f,
        -0.628f, -0.587528f, 0f,
        -0.314f, -0.308866f, 0f,
        0f, 0f, 0f,
        0.314f, 0.308866f, 0f,
        0.628f, 0.587528f, 0f,
        0.942f, 0.808736f, 0f,
        1.256f, 0.950859f, 0f,
        1.57f, 1f, 0f,
        1.884f, 0.951351f, 0f,
        2.198f, 0.809672f, 0f,
        2.512f, 0.588816f, 0f,
        2.826f, 0.31038f, 0f,
        3.14f, 0.00159265f, 0f
        }; 
        vertbuffer = makefloatbuffer(verts);
    }

    @Override
    public void onSurfaceChanged(GL10 gl, int width, int height) {
        GLES20.glViewport(0, 0, width, height);
    }

    @Override
    public void onDrawFrame(GL10 gl) {
        GLES20.glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
        GLES20.glUniform4f(tut1.Shader.colorhandle, 1.0f, 0.0f, 0.0f, 1.0f);
        GLES20.glVertexAttribPointer(tut1.Shader.positionhandle, 3, GLES20.GL_FLOAT, false, 0, vertbuffer);
        GLES20.glDrawArrays(GLES20.GL_LINE_STRIP, 0, 3);
    }

    public FloatBuffer makefloatbuffer(float[] array) {
        FloatBuffer floatbuff = ByteBuffer.allocateDirect(array.length*4).order(ByteOrder.nativeOrder()).asFloatBuffer();
        floatbuff.put(array).position(0);
        return floatbuff;
    }

}

Android 如何将 OpenGL ES 1.0 代码转换为 OpenGL Es 2.0？

How to Convert OpenGL ES 1.0 code to OpenGL Es 2.0 on Android?

android

opengl-es

opengl-es-2.0

opengl-es-1.1