/*
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* Copyright (C) 2018 Baidu, Inc. All Rights Reserved.
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*/
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package com.example.datalibrary.view;
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import android.opengl.GLES20;
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import java.nio.Buffer;
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import java.nio.ByteBuffer;
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import java.nio.ByteOrder;
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/**
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* GL图形绘制渲染器
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*/
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public class ColorViewImpl {
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private int program1;
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private int textureI;
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private int tIindex;
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private float[] vertices;
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private int positionHandle1 = -1;
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private int coordHandle1 = -1;
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private int yhandle = -1;
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private int ytid = -1;
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private ByteBuffer verticebuffer;
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private ByteBuffer coordbuffer;
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private int videowidth = -1;
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private int videoheight = -1;
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private boolean isProgBuilt = false;
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public ColorViewImpl() {
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setup();
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}
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private void setup() {
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vertices = squareVertices;
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textureI = GLES20.GL_TEXTURE0;
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tIindex = 0;
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createBuffers(vertices);
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}
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private void createBuffers(float[] vert) {
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verticebuffer = ByteBuffer.allocateDirect(vert.length * 4);
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verticebuffer.order(ByteOrder.nativeOrder());
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verticebuffer.asFloatBuffer().put(vert);
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verticebuffer.position(0);
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if (coordbuffer == null) {
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coordbuffer = ByteBuffer.allocateDirect(coordVertices.length * 4);
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coordbuffer.order(ByteOrder.nativeOrder());
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coordbuffer.asFloatBuffer().put(coordVertices);
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coordbuffer.position(0);
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}
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}
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public void drawSelf() {
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// 将program加入OpenGL ES环境中
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GLES20.glUseProgram(program1);
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// ShaderUtil.checkGlError("glUseProgram");
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GLES20.glVertexAttribPointer(positionHandle1, 2, GLES20.GL_FLOAT, false,
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8, verticebuffer);
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// ShaderUtil.checkGlError("glVertexAttribPointer mPositionHandle");
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GLES20.glEnableVertexAttribArray(positionHandle1);
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GLES20.glVertexAttribPointer(coordHandle1, 2, GLES20.GL_FLOAT, false, 8,
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coordbuffer);
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// ShaderUtil.checkGlError("glVertexAttribPointer maTextureHandle");
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GLES20.glEnableVertexAttribArray(coordHandle1);
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// bind textures
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GLES20.glActiveTexture(textureI);
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GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, ytid);
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GLES20.glUniform1i(yhandle, tIindex);
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GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
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GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0);
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GLES20.glDisableVertexAttribArray(positionHandle1);
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GLES20.glDisableVertexAttribArray(coordHandle1);
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GLES20.glFinish();
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}
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private static float[] squareVertices = {-1.0f, -1.0f, 1.0f, -1.0f, -1.0f, 1.0f, 1.0f, 1.0f};
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private static float[] coordVertices = {0.0f, 1.0f, 1.0f, 1.0f, 0.0f, 0.0f, 1.0f, 0.0f};
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/**
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* 用于渲染形状的顶点的OpenGLES图形代码
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*/
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private static final String VERTEX_SHADER = "attribute vec4 vPosition;\n"
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+ "attribute vec2 a_texCoord;\n" + "varying vec2 tc;\n"
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+ "void main() {\n" + "gl_Position = vPosition;\n"
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+ "tc = a_texCoord;\n" + "}\n";
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/**
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* 用于渲染形状的外观（颜色或纹理）的OpenGLES代码
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*/
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private static final String FRAGMENT_SHADER = "precision mediump float;\n"
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+ "uniform sampler2D tex_y;\n" + "varying vec2 tc;\n"
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+ "void main() {\n" + "gl_FragColor = texture2D(tex_y,tc);\n"
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+ "}\n";
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public boolean isProgramBuilt() {
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return isProgBuilt;
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}
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public void buildProgram() {
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if (program1 <= 0) {
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program1 = ImiShaderUtil.createProgram(VERTEX_SHADER, FRAGMENT_SHADER);
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}
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// 获取指向vertex shader的成员vPosition的 handle
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positionHandle1 = GLES20.glGetAttribLocation(program1, "vPosition");
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ImiShaderUtil.checkGlError("glGetAttribLocation vPosition");
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if (positionHandle1 == -1) {
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throw new RuntimeException(
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"Could not get attribute location for vPosition");
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}
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coordHandle1 = GLES20.glGetAttribLocation(program1, "a_texCoord");
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ImiShaderUtil.checkGlError("glGetAttribLocation a_texCoord");
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if (coordHandle1 == -1) {
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throw new RuntimeException(
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"Could not get attribute location for a_texCoord");
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}
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yhandle = GLES20.glGetUniformLocation(program1, "tex_y");
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ImiShaderUtil.checkGlError("glGetUniformLocation tex_y");
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if (yhandle == -1) {
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throw new RuntimeException(
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"Could not get uniform location for tex_y");
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}
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isProgBuilt = true;
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}
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public void buildTextures(Buffer rgbBuffer, int width, int height) {
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boolean videoSizeChanged = (width != videowidth || height != videoheight);
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if (videoSizeChanged) {
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videowidth = width;
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videoheight = height;
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}
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if (ytid < 0 || videoSizeChanged) {
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if (ytid >= 0) {
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GLES20.glDeleteTextures(1, new int[]{ytid}, 0);
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ImiShaderUtil.checkGlError("glDeleteTextures");
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}
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int[] textures = new int[1];
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GLES20.glGenTextures(1, textures, 0);
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ImiShaderUtil.checkGlError("glGenTextures");
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ytid = textures[0];
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GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, ytid);
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GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
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GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_NEAREST);
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GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D,
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GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
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GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S,
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GLES20.GL_CLAMP_TO_EDGE);
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GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T,
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GLES20.GL_CLAMP_TO_EDGE);
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}
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GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, ytid);
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ImiShaderUtil.checkGlError("glBindTexture");
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GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGB, videowidth,
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videoheight, 0, GLES20.GL_RGB, GLES20.GL_UNSIGNED_BYTE,
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rgbBuffer);
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ImiShaderUtil.checkGlError("glTexImage2D");
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}
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}
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