笔记，安卓上简单的surfaceview使用

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建立基于GLSurfaceView的类：

public class MyGLSurfaceView extends GLSurfaceView {

初始化：

1. onSurfaceCreated:

a) mProgram = createProgram(mVertexShader, mFragmentShader);
vao, vertex, coords handle
b) textures
GLES30.glGenTextures(1, textures, 0);
mTextureID = textures[0];
GLES30.glBindTexture(GL_TEXTURE_EXTERNAL_OES, mTextureID);
GLES30.glTexParameterf( ... // configure
c) SurfaceTexture mSurface;
mSurface = new SurfaceTexture(mTextureID);
mSurface.setOnFrameAvailableListener(this);

显示：

2. onDrawFrame:
a) mSurface.updateTexImage();

得到一个oes纹理，然后用这个oes纹理进行绘制
b) GLES30.glUseProgram(mProgram);
c) GLES30.glActiveTexture(GLES30.GL_TEXTURE0);
GLES30.glBindTexture(GL_TEXTURE_EXTERNAL_OES, mTextureID);
d) GLES30.glVertexAttribPointer(handle
GLES30.glEnableVertexAttribArray(handle
e) PVM
Matrix.setLookAtM(mVMatrix,...
Matrix.frustumM(mProjMatrix,...
Matrix.multiplyMM(mMVPMatrix, 0, mProjMatrix, 0, mVMatrix, 0);
f) GLES30.glDrawArrays(GLES30.GL_TRIANGLES, ...

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