我想在Android上制作自定义水印渲染器。
我将在当前相机预览屏幕上方的右下角添加水印。
这是我做的源代码。这段代码不起作用。
请帮我。谢谢。
函数调用顺序是：
-setWatermarkTexture
-createBuffers
-configureOpenGL
-画
public class WatermarkRenderer implements Renderer {
private int[] textureHandles = new int[1];
float vertices[] = {
-1, 0.5f,
-0.5f, -0.5f,
-1, 1,
-0.5f, 1,
};
float texCoords[] = {
0, 0,
1, 0,
0, 1,
1, 1,
};
private Bitmap watermark;
private int[] buffers = new int[2];
private float[] projectionMatrix = new float[16];
private FloatBuffer vertexBuffer;
private FloatBuffer textureBuffer;
@Override
public void configureOpenGL() {
GLES20.glGenTextures(textureHandles.length, textureHandles, 0);
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandles[0]);
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);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glTexParameterf(GLES20.GL_TEXTURE_2D, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
GLES20.glGenBuffers(buffers.length, buffers, 0);
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, buffers[0]);
GLES20.glBufferData(GLES20.GL_ARRAY_BUFFER, 8, vertexBuffer, GLES20.GL_STATIC_DRAW );
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, buffers[1]);
GLES20.glBufferData(GLES20.GL_ARRAY_BUFFER, 8, textureBuffer, GLES20.GL_STATIC_DRAW );
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
GLES20.glBindBuffer(GLES20.GL_ELEMENT_ARRAY_BUFFER, 0);
}
@Override
public void createBuffers() {
vertexBuffer = FloatBuffer.allocate(8);
vertexBuffer.put(vertices);
vertexBuffer.position(0);
textureBuffer = FloatBuffer.allocate(8);
textureBuffer.put(texCoords);
textureBuffer.position(0);
}
@Override
public void draw() {
GLES20.glEnable(GLES20.GL_DEPTH_TEST);
GLES20.glEnable(GLES20.GL_BLEND);
//GLES20.glBlendFunc(GLES20.GL_ONE, GLES20.GL_ONE_MINUS_SRC_ALPHA);
//GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA );
if (watermark != null) {
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, watermark, 0);
watermark.recycle();
watermark = null;
}
/*
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, buffers[0]);
GLES20.glEnableVertexAttribArray(AttributeLocations.POSITION);
GLES20.glVertexAttribPointer(AttributeLocations.POSITION, 2, GLES20.GL_FLOAT, false, 0, 0);
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, buffers[1]);
GLES20.glEnableVertexAttribArray(AttributeLocations.TEXTURE_COORDINATES );
GLES20.glVertexAttribPointer(AttributeLocations.TEXTURE_COORDINATES, 2, GLES20.GL_FLOAT, false, 0, 0);
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4 );
GLES20.glDisableVertexAttribArray(AttributeLocations.POSITION);
GLES20.glDisableVertexAttribArray(AttributeLocations.TEXTURE_COORDINATES);
*/
GLES20.glDisable(GLES20.GL_BLEND);
GLES20.glDisable(GLES20.GL_DEPTH_TEST);
}
@Override
public void setProjectionMatrix(float[] projectionMatrix) {
this.projectionMatrix = projectionMatrix;
}
public void setWatermarkTexture(Bitmap bitmap) {
watermark = bitmap;
}
}
我解决了我的问题。
这是源代码。
public class WatermarkRenderer implements Renderer {
private final float[] TEX_VERTICES = {
0.0f, 1.0f,
1.0f, 1.0f,
0.0f, 0.0f,
1.0f, 0.0f
};
private final float[] POS_VERTICES = {
0.2f, -1.0f,
1.0f, -1.0f,
0.2f, -0.9f,
1.0f, -0.9f
};
private static final String VERTEX_SHADER =
"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";
private static final String FRAGMENT_SHADER =
"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";
private final int FLOAT_SIZE_BYTES = 4;
private Bitmap watermark;
private int shaderProgram;
private int texSamplerHandle;
private int texCoordHandle;
private int posCoordHandle;
private FloatBuffer texVertices;
private FloatBuffer posVertices;
private int[] textureHandles = new int[1];
@Override
public void configureOpenGL() {
shaderProgram = GLES20.glCreateProgram();
GLES20.glAttachShader(shaderProgram, OpenGLUtils.loadShader(GLES20.GL_VERTEX_SHADER, VERTEX_SHADER));
GLES20.glAttachShader(shaderProgram, OpenGLUtils.loadShader(GLES20.GL_FRAGMENT_SHADER, FRAGMENT_SHADER));
GLES20.glLinkProgram(shaderProgram);
int[] linkStatus = new int[1];
GLES20.glGetProgramiv(shaderProgram, GLES20.GL_LINK_STATUS, linkStatus, 0);
if (linkStatus[0] != GLES20.GL_TRUE) {
String info = GLES20.glGetProgramInfoLog(shaderProgram);
GLES20.glDeleteProgram(shaderProgram);
shaderProgram = 0;
throw new RuntimeException("Could not link program: " + info);
}
texSamplerHandle = GLES20.glGetUniformLocation(shaderProgram, "tex_sampler");
texCoordHandle = GLES20.glGetAttribLocation(shaderProgram, "a_texcoord");
posCoordHandle = GLES20.glGetAttribLocation(shaderProgram, "a_position");
}
@Override
public void createBuffers() {
ByteBuffer byteBuffer;
byteBuffer = ByteBuffer.allocateDirect(TEX_VERTICES.length * FLOAT_SIZE_BYTES);
byteBuffer.order(ByteOrder.nativeOrder());
texVertices = byteBuffer.asFloatBuffer();
texVertices.put(TEX_VERTICES);
texVertices.position(0);
byteBuffer = ByteBuffer.allocateDirect(POS_VERTICES.length * FLOAT_SIZE_BYTES);
byteBuffer.order(ByteOrder.nativeOrder());
posVertices = byteBuffer.asFloatBuffer();
posVertices.put(POS_VERTICES);
posVertices.position(0);
}
@Override
public void draw() {
// Select the program.
GLES20.glUseProgram(shaderProgram);
GLES20.glEnable(GLES20.GL_BLEND);
GLES20.glBlendFunc(GLES20.GL_SRC_ALPHA, GLES20.GL_ONE_MINUS_SRC_ALPHA );
// Set the vertex attributes
GLES20.glVertexAttribPointer(texCoordHandle, 2, GLES20.GL_FLOAT, false, 0, texVertices);
GLES20.glEnableVertexAttribArray(texCoordHandle);
GLES20.glVertexAttribPointer(posCoordHandle, 2, GLES20.GL_FLOAT, false, 0, posVertices);
GLES20.glEnableVertexAttribArray(posCoordHandle);
// Set the input texture
GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandles[0]);
GLES20.glUniform1i(texSamplerHandle, 0);
GLES20.glGenTextures(textureHandles.length, textureHandles, 0);
GLES20.glBindTexture(GLES20.GL_TEXTURE_2D, textureHandles[0]);
GLUtils.texImage2D(GLES20.GL_TEXTURE_2D, 0, watermark, 0);
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);
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
GLES20.glDisableVertexAttribArray(texCoordHandle);
GLES20.glDisableVertexAttribArray(posCoordHandle);
GLES20.glDisable(GLES20.GL_BLEND);
GLES20.glUseProgram(0);
}
@Override
public void setProjectionMatrix(float[] projectionMatrix) {
}
public void setWatermarkTexture(Bitmap bitmap) {
watermark = bitmap;
}
}