在fbo的时候可不可以加水印

ab503044120 commented 7 years ago

我在fbo的时候就打上水印以免之后的屏幕显示和编码打包两次都要打水印,现在我出现的问题是:水印是黑色的,不知道你们有没有遇到过这样的问题

SuperJim123 commented 7 years ago

@ab503044120 是不是没有打开透明通道，能把fbo上添加水印的代码贴一下吗？

ab503044120 commented 7 years ago

打开透明通道怎么操作? 我是直接创建了新的progam,shader如下

    public static final String NO_FILTER_VERTEX_SHADER = "" +
            "attribute vec4 position;\n" +
            "attribute vec4 inputTextureCoordinate;\n" +
            " \n" +
            "varying vec2 textureCoordinate;\n" +
            " \n" +
            "void main()\n" +
            "{\n" +
            "    gl_Position = position;\n" +
            "    textureCoordinate = inputTextureCoordinate.xy;\n" +
            "}";
    public static final String NO_FILTER_FRAGMENT_SHADER = "" +
            "varying highp vec2 textureCoordinate;\n" +
            " \n" +
            "uniform sampler2D inputImageTexture;\n" +
            " \n" +
            "void main()\n" +
            "{\n" +
            "     gl_FragColor = texture2D(inputImageTexture, textureCoordinate);\n" +
            "}";

创建program

   mGLProgId = OpenGlUtils.loadProgram(mVertexShader, mFragmentShader);
        mGLAttribPosition = GLES20.glGetAttribLocation(mGLProgId, "position");
        mGLUniformTexture = GLES20.glGetUniformLocation(mGLProgId, "inputImageTexture");
        mGLAttribTextureCoordinate = GLES20.glGetAttribLocation(mGLProgId,
                "inputTextureCoordinate");

画相机输入画面

和你的一样

画水印

if (mWatermarkImg == null) {
            return;
        }
        mWatermarkVertexBuffer.position(0);
        GLES20.glVertexAttribPointer(mGLAttribPosition,
                3, GLES20.GL_FLOAT, false, 4 * 3, mWatermarkVertexBuffer);
        GLES20.glEnableVertexAttribArray(mGLAttribPosition);

        mGLTextureBuffer.position(0);
        GLES20.glVertexAttribPointer(mGLAttribTextureCoordinate,
                2, GLES20.GL_FLOAT, false, 4 * 2, mGLTextureBuffer);
        GLES20.glEnableVertexAttribArray(mGLAttribTextureCoordinate);

        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, mWatermarkTextureId);
        GLES20.glActiveTexture(GLES20.GL_TEXTURE1);
        GLES20.glUniform1f(mGLUniformTexture, 1);
        GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA);
        GLES20.glEnable(GLES20.GL_BLEND);
        GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
        GLES20.glDisableVertexAttribArray(mGLAttribPosition);
        GLES20.glDisableVertexAttribArray(mGLAttribTextureCoordinate);
        GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, 0);
        GLES20.glDisable(GLES20.GL_BLEND);

LaiFeng-Android / SopCastComponent

在fbo的时候可不可以加水印 #18