Android GlSurfaceView渲染YUV图形

OpenGL ES 2.0 的代码，用来显示YUV格式的视频数据。这个示例将包括初始化OpenGL环境、加载Shader程序、绘制纹理等步骤

import android.content.Context;
import android.opengl.GLES20;

import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;

public class YUVShaderProgram {

    private int program;

    private int avPosition_yuv;
    private int afPosition_yuv;
    private final FloatBuffer vertexBuffer;
    private final FloatBuffer textureBuffer;

    private  int yTextureLocation;
    private  int uTextureLocation;
    private  int vTextureLocation;

    private static final String VERTEX_SHADER =
            "attribute vec4 av_Position;\n" +
                    "attribute vec2 af_Position;\n" +
                    "varying vec2 v_texCord;\n" +
                    "void main() {\n" +
                    "gl_Position = av_Position;\n" +
                    "v_texCord = af_Position;\n" +
                    "}\n";

    private static final String FRAGMENT_SHADER =
            "precision mediump float;\n" +
                    "uniform sampler2D sampler_y;\n" +
                    "uniform sampler2D sampler_u;\n" +
                    "uniform sampler2D sampler_v;\n" +
                    "varying vec2 v_texCord;\n" +
                    "void main() {\n" +
                    "vec4 c = vec4((texture2D(sampler_y, v_texCord).r - 16./255.) * 1.164);\n" +
                    "vec4 U = vec4(texture2D(sampler_u, v_texCord).r - 128./255.);\n" +
                    "vec4 V = vec4(texture2D(sampler_v, v_texCord).r - 128./255.);\n" +
                    "c += V * vec4(1.596, -0.813, 0, 0);\n" +
                    "c += U * vec4(0, -0.392, 2.017, 0);\n" +
                    "c.a = 1.0;\n" +
                    "gl_FragColor = c;\n" +
                    "}\n";

    public YUVShaderProgram(Context context) {
        //顶点坐标
        float[] vertexData = {
                -1f, -1f,
                1f, -1f,
                -1f, 1f,
                1f, 1f
        };
        vertexBuffer = ByteBuffer.allocateDirect(vertexData.length * 4)
                .order(ByteOrder.nativeOrder())
                .asFloatBuffer()
                .put(vertexData);
        vertexBuffer.position(0);

        //纹理坐标
        float[] textureData = {
                0f, 1f,
                1f, 1f,
                0f, 0f,
                1f, 0f
        };
        textureBuffer = ByteBuffer.allocateDirect(textureData.length * 4)
                .order(ByteOrder.nativeOrder())
                .asFloatBuffer()
                .put(textureData);
        textureBuffer.position(0);
        program = createProgram(VERTEX_SHADER, FRAGMENT_SHADER);
    }

    public void useProgram() {
        GLES20.glUseProgram(program);
    }

    public void enableVertex(){
        GLES20.glEnableVertexAttribArray(avPosition_yuv);//使顶点属性数组有效
        GLES20.glVertexAttribPointer(avPosition_yuv, 2, GLES20.GL_FLOAT, false, 0, vertexBuffer);//为顶点属性赋值

        GLES20.glEnableVertexAttribArray(afPosition_yuv);
        GLES20.glVertexAttribPointer(afPosition_yuv, 2, GLES20.GL_FLOAT, false, 0, textureBuffer);
    }
    public void loadLocation(){
        avPosition_yuv = GLES20.glGetAttribLocation(program, "av_Position");
        afPosition_yuv = GLES20.glGetAttribLocation(program, "af_Position");
    }
    public void setUniforms() {
        yTextureLocation = GLES20.glGetUniformLocation(program, "sampler_y");

        uTextureLocation = GLES20.glGetUniformLocation(program, "sampler_u");

        vTextureLocation = GLES20.glGetUniformLocation(program, "sampler_v");
    }

    public void glUniform1i(){
        GLES20.glUniform1i(yTextureLocation, 0);
        GLES20.glUniform1i(uTextureLocation, 1);
        GLES20.glUniform1i(vTextureLocation, 2);
    }

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

    private int createProgram(String vertexShaderCode, String fragmentShaderCode) {
        int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexShaderCode);
        int fragmentShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentShaderCode);

        int program = GLES20.glCreateProgram();
        GLES20.glAttachShader(program, vertexShader);
        GLES20.glAttachShader(program, fragmentShader);
        GLES20.glLinkProgram(program);
        return program;
    }
}

```java
class EffectRender(var mContext:Context,var glView:GLSurfaceView,var mWidth:Int,var mHeight:Int):GLSurfaceView.Renderer,
    SurfaceTexture.OnFrameAvailableListener {
    private val TAG = "EffectRender"
    private val textures = IntArray(3) // 纹理句柄
    private val COORDS_PER_VERTEX = 2
    private val TEXTURE_COORDS_PER_VERTEX = 2
    private var positionHandle = 0
    private var textureCoordHandle = 0
    private var cameraData:ByteArray?=null
    private var mDrawTextureBuffer: FloatBuffer? = null
    private var mDrawGlCubeBuffer: FloatBuffer? = null
    private var yData:ByteArray?=null
    private var uData:ByteArray?=null
    private var vData:ByteArray?=null
    var ySurfaceTexture: SurfaceTexture?=null
    var uSurfaceTexture: SurfaceTexture?=null
    var vSurfaceTexture: SurfaceTexture?=null
    private val mvpMatrix = FloatArray(16)
    private var shaderProgram: YUVShaderProgram? = null
    //顶点坐标数据，表示预览图像的位置和大小。
    private var avPosition_yuv: Int = 0
    private val afPosition_yuv = 0
    private var mRenderInput: NveRenderInput?=null
    override fun onSurfaceCreated(p0: GL10?, p1: EGLConfig?) {
        GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
        shaderProgram = YUVShaderProgram(mContext)
        shaderProgram?.useProgram()
        shaderProgram?.loadLocation()
        shaderProgram?.setUniforms()

        // 创建三个纹理
        GLES20.glGenTextures(3, textures, 0)

        ySurfaceTexture = SurfaceTexture(textures[0])
        uSurfaceTexture = SurfaceTexture(textures[1])
        vSurfaceTexture = SurfaceTexture(textures[2])

        // 设置纹理参数
        for (i in 0..2) {
            GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textures[i])
            //设置环绕和过滤方式
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
            GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_NEAREST);
        }
    }

    override fun onSurfaceChanged(p0: GL10?, p1: Int, p2: Int) {
        Log.i(TAG,"onSurfaceChanged = $p1 $p2")
        GLES20.glViewport(0, 0, p1, p2);
    }

    override fun onDrawFrame(p0: GL10?) {
        effectData()
        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
        shaderProgram?.useProgram()
        shaderProgram?.enableVertex()
        yData?.let {
            GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
            GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textures[0]);
            GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE, mWidth, mHeight, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, ByteBuffer.wrap(it));
        }

        uData?.let {
            GLES20.glActiveTexture(GLES20.GL_TEXTURE1);
            GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textures[1]);
            GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE, mWidth/2, mHeight/2, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, ByteBuffer.wrap(it))
        }

        vData?.let {
            GLES20.glActiveTexture(GLES20.GL_TEXTURE2);
            GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textures[2]);
            GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_LUMINANCE, mWidth/2, mHeight/2, 0, GLES20.GL_LUMINANCE, GLES20.GL_UNSIGNED_BYTE, ByteBuffer.wrap(it));
        }
        shaderProgram?.glUniform1i()
        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
    }

    private fun effectData(){
        cameraData?.let {
            val yPlaneSize: Int = mWidth * mHeight
            val uvPlaneSize: Int = yPlaneSize/4
            yData = ByteArray(yPlaneSize)
            System.arraycopy(it, 0, yData, 0, yPlaneSize)
            uData = ByteArray(uvPlaneSize)
            System.arraycopy(it, yPlaneSize, uData, 0, uvPlaneSize)
            vData = ByteArray(uvPlaneSize)
            System.arraycopy(it, yPlaneSize+uvPlaneSize, vData, 0, uvPlaneSize)
        }
    }

    fun refreshView(data:ByteArray){
        cameraData = data

        glView.requestRender()
    }

    override fun onFrameAvailable(p0: SurfaceTexture?) {
    }
}

使用示例：

<android.opengl.GLSurfaceView
            android:id="@+id/glsurface_view"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
            
binding.glsurfaceView.setEGLContextClientVersion(2)
render = EffectRender(this,binding.glsurfaceView,1920,1080)
binding.glsurfaceView.setRenderer(render)
binding.glsurfaceView.renderMode = GLSurfaceView.RENDERMODE_WHEN_DIRTY
//开启摄像头获取数据送入渲染
cameraHelper = CameraHelper()
cameraHelper?.init(this,"0",1920,1080, object : CameraHelper.CallBack {
            override fun onCameraPreviewCallBack(data: ByteArray?) {
                data?.let { render?.refreshView(data) }
            }
        })