Android之GLES2.0显示图片测试代码

public class MainActivity extends Activity {private GLSurfaceView mEffectView;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                DemoTextureRenderer renderer = new DemoTextureRenderer(this);        mEffectView = new GLSurfaceView(this);        mEffectView.setEGLContextClientVersion(2);        mEffectView.setRenderer(renderer);        mEffectView.setRenderMode(GLSurfaceView.RENDERMODE_WHEN_DIRTY);        setContentView(mEffectView);    }}class DemoTextureRenderer implements GLSurfaceView.Renderer{private Bitmap bmp;    private int mProgram;    private int mTexSamplerHandle;    private int mTexCoordHandle;    private int mPosCoordHandle;    private FloatBuffer mTexVertices;    private FloatBuffer mPosVertices;    private int[] mTextures = new int[2];        public DemoTextureRenderer(Context c) {    bmp = BitmapFactory.decodeResource(c.getResources(), R.drawable.aa);    }    @Override    public void onSurfaceCreated(GL10 gl, EGLConfig config) {    //纹理坐标屏幕右上角为原点(左下，右下，左上，右上)        float[] TEX_VERTICES = { 0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f };        mTexVertices = ByteBuffer.allocateDirect(TEX_VERTICES.length * 4)                .order(ByteOrder.nativeOrder()).asFloatBuffer();        mTexVertices.put(TEX_VERTICES).position(0);        //顶点坐标屏幕中心点为原点(左下，右下，左上，右上)        float[] POS_VERTICES = {-1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 1.0f };        mPosVertices = ByteBuffer.allocateDirect(POS_VERTICES.length * 4)                .order(ByteOrder.nativeOrder()).asFloatBuffer();        mPosVertices.put(POS_VERTICES).position(0);        //着色器程序        String VERTEX_SHADER_CODE =                "attribute vec4 a_position;\n" +                "attribute vec2 a_texcoord;\n" +                "varying vec2 v_texcoord;\n" +                "void main() {\n" +                "  gl_Position = a_position;\n" +                "  v_texcoord = a_texcoord;\n" +                "}\n";        String FRAGMENT_SHADER_CODE =                "precision mediump float;\n" +                "uniform sampler2D tex_sampler;\n" +                "varying vec2 v_texcoord;\n" +                "void main() {\n" +                "  gl_FragColor = texture2D(tex_sampler, v_texcoord);\n" +                "}\n";        mProgram = GLShaderToolbox.createProgram(VERTEX_SHADER_CODE, FRAGMENT_SHADER_CODE);        mTexSamplerHandle = GLES20.glGetUniformLocation(mProgram,"tex_sampler");        mTexCoordHandle = GLES20.glGetAttribLocation(mProgram, "a_texcoord");        mPosCoordHandle = GLES20.glGetAttribLocation(mProgram, "a_position");        //创建纹理并将图片贴入纹理        GLES20.glGenTextures(2, mTextures , 0);        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextures[0]);        GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, bmp, 0);        GLShaderToolbox.initTextureNeedParams();    }        @Override    public void onSurfaceChanged(GL10 gl, int width, int height) {    GLES20.glViewport(0, 0, width, height);        GLShaderToolbox.checkGlError("glViewport");    //调整AspectRatio 保证landscape和portrait的时候显示比例相同，图片不会被拉伸        if (mPosVertices != null) {            float imgAspectRatio = bmp.getWidth() / (float)bmp.getHeight();            float viewAspectRatio = width / (float)height;            float relativeAspectRatio = viewAspectRatio / imgAspectRatio;            float x0, y0, x1, y1;            if (relativeAspectRatio > 1.0f) {                x0 = -1.0f / relativeAspectRatio;                y0 = -1.0f;                x1 = 1.0f / relativeAspectRatio;                y1 = 1.0f;            } else {                x0 = -1.0f;                y0 = -relativeAspectRatio;                x1 = 1.0f;                y1 = relativeAspectRatio;            }            float[] coords = new float[] { x0, y0, x1, y0, x0, y1, x1, y1 };            mPosVertices.put(coords).position(0);        }    }        @Override    public void onDrawFrame(GL10 gl) {        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);        GLES20.glUseProgram(mProgram);        GLShaderToolbox.checkGlError("glUseProgram");        //将纹理坐标传递给着色器程序并使能属性数组        GLES20.glVertexAttribPointer(mTexCoordHandle, 2, GLES20.GL_FLOAT, false, 0, mTexVertices);        GLES20.glEnableVertexAttribArray(mTexCoordHandle);        GLShaderToolbox.checkGlError("vertex attribute setup");        //将顶点坐标传递给着色器程序并使能属性数组        GLES20.glVertexAttribPointer(mPosCoordHandle, 2, GLES20.GL_FLOAT, false, 0, mPosVertices);        GLES20.glEnableVertexAttribArray(mPosCoordHandle);        GLShaderToolbox.checkGlError("vertex attribute setup");        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);        GLShaderToolbox.checkGlError("glActiveTexture");        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mTextures[0]);        GLShaderToolbox.checkGlError("glBindTexture");        GLES20.glUniform1i(mTexSamplerHandle, 0);        GLES20.glClearColor(0.0f, 0.0f, 0.0f, 1.0f);        GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);    }}class GLShaderToolbox {    public static int loadShader(int shaderType, String source) {        int shader = GLES20.glCreateShader(shaderType);        if (shader != 0) {            GLES20.glShaderSource(shader, source);            GLES20.glCompileShader(shader);            int[] compiled = new int[1];            GLES20.glGetShaderiv(shader, GLES20.GL_COMPILE_STATUS, compiled, 0);            if (compiled[0] == 0) {                String info = GLES20.glGetShaderInfoLog(shader);                GLES20.glDeleteShader(shader);                shader = 0;                throw new RuntimeException("Could not compile shader " +                shaderType + ":" + info);            }        }        return shader;    }    public static int createProgram(String vertexSourceCode, String fragmentSourceCode) {        int vertexShader = loadShader(GLES20.GL_VERTEX_SHADER, vertexSourceCode);        if (vertexShader == 0)return 0;        int pixelShader = loadShader(GLES20.GL_FRAGMENT_SHADER, fragmentSourceCode);        if (pixelShader == 0)return 0;        int program = GLES20.glCreateProgram();        if (program != 0) {            GLES20.glAttachShader(program, vertexShader);            checkGlError("glAttachShader");            GLES20.glAttachShader(program, pixelShader);            checkGlError("glAttachShader");            GLES20.glLinkProgram(program);            int[] linkStatus = new int[1];            GLES20.glGetProgramiv(program, GLES20.GL_LINK_STATUS, linkStatus, 0);            if (linkStatus[0] != GLES20.GL_TRUE) {                String info = GLES20.glGetProgramInfoLog(program);                GLES20.glDeleteProgram(program);                program = 0;                throw new RuntimeException("Could not link program: " + info);            }        }        return program;    }    public static void checkGlError(String op) {        int error;        while ((error = GLES20.glGetError()) != GLES20.GL_NO_ERROR) {            throw new RuntimeException(op + ": glError " + error);        }    }    public static void initTextureNeedParams() {        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);        GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);        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);   }}
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