는 OpenGL. 그려지는 내용을 변경할 수 있기를 원합니다 (새로운 지점으로 장면을 업데이트하십시오). 완전히 새로운 객체를 재생성하는 것은 좋지 않으므로 버퍼의 내용을 변경하려고했습니다. 최근에 나는 glBufferSubData()
에 대해 알았지 만, 어떻게 사용하는지 모르겠습니다.동적 변화 정점 버퍼 데이터 I는 몇 가지 포인트를 그릴 버퍼를 사용하는 점을 클래스
public class Point {
private int mProgram, mPositionHandle, mColorHandle, mMVPMatrixHandle;
private FloatBuffer vertexBuffer,colorBuffer;
private static final int COORDS_PER_VERTEX = 3;
private static final int COORDS_PER_COLOR = 3;
private int vertexCount,colorCount;
private final String vertexShaderCode =
"uniform mat4 uMVPMatrix;" +
"attribute vec4 vPosition;" +
"attribute mediump vec4 vColor;" +
"varying mediump vec4 vaColor;" +
"void main() {" +
" vaColor = vColor;" +
" gl_Position = uMVPMatrix * vPosition;" +
" gl_PointSize = 20.0;" +
"}";
private final String fragmentShaderCode =
"precision mediump float;" +
"varying mediump vec4 vaColor;" +
"void main() {" +
" gl_FragColor = vaColor;" +
"}";
private static int vertexStride = COORDS_PER_VERTEX * 4;
private final int colorStride = COORDS_PER_COLOR * 4;
public Point(float pointCoords[],float colorCoords[]){
this.vertexCount = pointCoords.length/COORDS_PER_VERTEX;
this.colorCount = colorCoords.length/COORDS_PER_COLOR;
ByteBuffer vbb = ByteBuffer.allocateDirect(pointCoords.length * 4);
vbb.order(ByteOrder.nativeOrder());
vertexBuffer = vbb.asFloatBuffer();
vertexBuffer.put(pointCoords);
vertexBuffer.position(0);
ByteBuffer cbb = ByteBuffer.allocateDirect(colorCoords.length * 4);
cbb.order(ByteOrder.nativeOrder());
colorBuffer = cbb.asFloatBuffer();
colorBuffer.put(colorCoords);
colorBuffer.position(0);
int vertexShader = MyGLRenderer.loadShader(GLES20.GL_VERTEX_SHADER,
vertexShaderCode);
int fragmentShader = MyGLRenderer.loadShader(GLES20.GL_FRAGMENT_SHADER,
fragmentShaderCode);
// create empty OpenGL ES Program
mProgram = GLES20.glCreateProgram();
// create empty OpenGL ES Program
mProgram = GLES20.glCreateProgram();
// add the vertex shader to program
GLES20.glAttachShader(mProgram, vertexShader);
// add the fragment shader to program
GLES20.glAttachShader(mProgram, fragmentShader);
// creates OpenGL ES program executables
GLES20.glLinkProgram(mProgram);
}
public void draw(float[] mvpMatrix) {
// Add program to OpenGL ES environment
GLES20.glUseProgram(mProgram);
// get handle to vertex shader's vPosition member
mPositionHandle = GLES20.glGetAttribLocation(mProgram, "vPosition");
// Enable a handle to the triangle vertices
GLES20.glEnableVertexAttribArray(mPositionHandle);
// Prepare the point coordinate data
GLES20.glVertexAttribPointer(mPositionHandle, COORDS_PER_VERTEX,
GLES20.GL_FLOAT, false,
vertexStride, vertexBuffer);
mColorHandle = GLES20.glGetAttribLocation(mProgram,"vColor");
GLES20.glEnableVertexAttribArray(mColorHandle);
// Set color for drawing the triangle
GLES20.glVertexAttribPointer(mColorHandle, COORDS_PER_COLOR, GLES20.GL_FLOAT, false,
colorStride, colorBuffer);
// get handle to shape's transformation matrix
mMVPMatrixHandle = GLES20.glGetUniformLocation(mProgram, "uMVPMatrix");
//TRANSLATION
float[] transMatrix = new float[16];
Matrix.setIdentityM(transMatrix,0);
Matrix.translateM(transMatrix,0,0.5f,0,0);
Matrix.multiplyMM(transMatrix,0,mvpMatrix,0,transMatrix,0);
// Apply the projection and view transformation
GLES20.glUniformMatrix4fv(mMVPMatrixHandle, 1, false, mvpMatrix, 0);
GLES20.glDrawArrays(GLES20.GL_POINTS, 0, vertexCount);
// Disable vertex array
GLES20.glDisableVertexAttribArray(mPositionHandle);
}
/**
* Change content of buffer
*/
public void changeBufferData(float[] newBufferInfo) {
GLES20.glBufferSubData(?,0,newBufferInfo.length*4,vertexBuffer);
}
}
저는 gl을 열어 본 경험이 있습니다. 나는 당신이 말한 것을 이해하고, 나는 그것을 구현할 수 있는지 알아볼 것입니다. –
도움이 될 수 있습니다 : http://www.learnopengles.com/android-lesson-seven-an-introduction-to-vertex-buffer-objects-vbos/ – solidpixel