image.png
image.png
image.png
image.png
由于我们使用了FBO，绘制水印的工作就放在了FBO中
主要逻辑代码：
WlCameraFboRender.java
package com.ywl5320.wllivepusher.camera;
import android.content.Context;
import android.graphics.Bitmap;
import android.opengl.GLES20;
import com.ywl5320.wllivepusher.R;
import com.ywl5320.wllivepusher.egl.WlShaderUtil;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.FloatBuffer;
public class WlCameraFboRender {
private Context context;
private float[] vertexData = {
-1f, -1f,
1f, -1f,
-1f, 1f,
1f, 1f,
0f, 0f,
0f, 0f,
0f, 0f,
0f, 0f
};
private FloatBuffer vertexBuffer;
private float[] fragmentData = {
0f, 1f,
1f, 1f,
0f, 0f,
1f, 0f
};
private FloatBuffer fragmentBuffer;
private int program;
private int vPosition;
private int fPosition;
private int textureid;
private int sampler;
private int vboId;
private Bitmap bitmap;
private int bitmapTextureid;
public WlCameraFboRender(Context context) {
this.context = context;
bitmap = WlShaderUtil.createTextImage("视频直播和推流：ywl5320", 50, "#ff0000", "#00000000", 0);
float r = 1.0f * bitmap.getWidth() / bitmap.getHeight();
float w = r * 0.1f;
vertexData[8] = 0.8f - w;
vertexData[9] = -0.8f;
vertexData[10] = 0.8f;
vertexData[11] = -0.8f;
vertexData[12] = 0.8f - w;
vertexData[13] = -0.7f;
vertexData[14] = 0.8f;
vertexData[15] = -0.7f;
vertexBuffer = ByteBuffer.allocateDirect(vertexData.length * 4)
.order(ByteOrder.nativeOrder())
.asFloatBuffer()
.put(vertexData);
vertexBuffer.position(0);
fragmentBuffer = ByteBuffer.allocateDirect(fragmentData.length * 4)
.order(ByteOrder.nativeOrder())
.asFloatBuffer()
.put(fragmentData);
fragmentBuffer.position(0);
}
public void onCreate()
{
GLES20.glEnable (GLES20.GL_BLEND);
GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);
String vertexSource = WlShaderUtil.getRawResource(context, R.raw.vertex_shader_screen);
String fragmentSource = WlShaderUtil.getRawResource(context, R.raw.fragment_shader_screen);
program = WlShaderUtil.createProgram(vertexSource, fragmentSource);
vPosition = GLES20.glGetAttribLocation(program, "v_Position");
fPosition = GLES20.glGetAttribLocation(program, "f_Position");
sampler = GLES20.glGetUniformLocation(program, "sTexture");
int [] vbos = new int[1];
GLES20.glGenBuffers(1, vbos, 0);
vboId = vbos[0];
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, vboId);
GLES20.glBufferData(GLES20.GL_ARRAY_BUFFER, vertexData.length * 4 + fragmentData.length * 4, null, GLES20. GL_STATIC_DRAW);
GLES20.glBufferSubData(GLES20.GL_ARRAY_BUFFER, 0, vertexData.length * 4, vertexBuffer);
GLES20.glBufferSubData(GLES20.GL_ARRAY_BUFFER, vertexData.length * 4, fragmentData.length * 4, fragmentBuffer);
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
bitmapTextureid = WlShaderUtil.loadBitmapTexture(bitmap);
}
public void onChange(int width, int height)
{
GLES20.glViewport(0, 0, width, height);
}
public void onDraw(int textureId)
{
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
GLES20.glClearColor(1f,0f, 0f, 1f);
GLES20.glUseProgram(program);
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, vboId);
//fbo
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureId);
GLES20.glEnableVertexAttribArray(vPosition);
GLES20.glVertexAttribPointer(vPosition, 2, GLES20.GL_FLOAT, false, 8,
0);
GLES20.glEnableVertexAttribArray(fPosition);
GLES20.glVertexAttribPointer(fPosition, 2, GLES20.GL_FLOAT, false, 8,
vertexData.length * 4);
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
//bitmap
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, bitmapTextureid);
GLES20.glEnableVertexAttribArray(vPosition);
GLES20.glVertexAttribPointer(vPosition, 2, GLES20.GL_FLOAT, false, 8,
32);
GLES20.glEnableVertexAttribArray(fPosition);
GLES20.glVertexAttribPointer(fPosition, 2, GLES20.GL_FLOAT, false, 8,
vertexData.length * 4);
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0);
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
}
}
需要注意的地方：
1、在顶点数组中定义好水印的位置
private float[] vertexData = {
-1f, -1f,
1f, -1f,
-1f, 1f,
1f, 1f,
0f, 0f,
0f, 0f,
0f, 0f,
0f, 0f
};
2、初始化水印bitmap，如果是文字也要转化为bitmap
public static Bitmap createTextImage(String text, int textSize, String textColor, String bgColor, int padding) {
Paint paint = new Paint();
paint.setColor(Color.parseColor(textColor));
paint.setTextSize(textSize);
paint.setStyle(Paint.Style.FILL);
paint.setAntiAlias(true);
float width = paint.measureText(text, 0, text.length());
float top = paint.getFontMetrics().top;
float bottom = paint.getFontMetrics().bottom;
Bitmap bm = Bitmap.createBitmap((int) (width + padding * 2), (int) ((bottom - top) + padding * 2), Bitmap.Config.ARGB_8888);
Canvas canvas = new Canvas(bm);
canvas.drawColor(Color.parseColor(bgColor));
canvas.drawText(text, padding, - top + padding, paint);
return bm;
}
3、得到水印的纹理id
public static int loadBitmapTexture(Bitmap bitmap)
{
int[] textureIds = new int[1];
GLES20.glGenTextures(1, textureIds, 0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureIds[0]);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_REPEAT);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_REPEAT);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
GLES20.glTexParameteri(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
ByteBuffer bitmapBuffer = ByteBuffer.allocate(bitmap.getHeight() * bitmap.getWidth() * 4);
bitmap.copyPixelsToBuffer(bitmapBuffer);
bitmapBuffer.flip();
GLES20.glTexImage2D(GLES20.GL_TEXTURE_2D, 0, GLES20.GL_RGBA, bitmap.getWidth(),
bitmap.getHeight(), 0, GLES20.GL_RGBA, GLES20.GL_UNSIGNED_BYTE, bitmapBuffer);
return textureIds[0];
}
4、在绘制玩视频画面后绘制水印纹理
//bitmap
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, bitmapTextureid);
GLES20.glEnableVertexAttribArray(vPosition);
GLES20.glVertexAttribPointer(vPosition, 2, GLES20.GL_FLOAT, false, 8,
32);
GLES20.glEnableVertexAttribArray(fPosition);
GLES20.glVertexAttribPointer(fPosition, 2, GLES20.GL_FLOAT, false, 8,
vertexData.length * 4);
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
5、注意水印坐标的归一化
//因为顶点坐标范围都是在-1到1之间的，我们规定水印的高度是0.1 那么水印的宽度怎么算呢？
float r = 1.0f * bitmap.getWidth() / bitmap.getHeight(); // 15/5=3
float w = r * 0.1f; // 3*0.1=0.3 这就是水印高度为0.1的时候，水印的宽度大小
vertexData[8] = 0.8f - w;
vertexData[9] = -0.8f;
vertexData[10] = 0.8f;
vertexData[11] = -0.8f;
vertexData[12] = 0.8f - w;
vertexData[13] = -0.7f;
vertexData[14] = 0.8f;
vertexData[15] = -0.7f;
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