我现在在同一个问题上运行了2天。我试图在Android（minApi 15，目标23）上的OpenGL ES 2.0中渲染通常的2D三角形（在3D空间中）。我已经重写了整个代码两次，并且我总是得到相同的结果。没有OpenGL错误或警告，没有Java异常，屏幕只是黑色......
无论如何，这里是渲染器类的代码，活动只是创建渲染器并在start()中调用onCreate()。
import static android.opengl.GLES20.*;
public class renderer implements GLSurfaceView.Renderer {
private Activity a;
private GLSurfaceView v;
private int buffs[];
private int prg;
private static boolean checkGLError(){
int i = glGetError();
if(i != GL_NO_ERROR){
Log.e("GLError", "Error: " + i);
return true;
}
return false;
}
private String VShaderSource =
"precision highp float;\n" +
"\n" +
"attribute mat4 mVP;\n" +
"\n" +
"attribute vec3 vPos;\n" +
"attribute vec3 col;\n" +
"\n" +
"varying vec3 oCol;\n" +
"\n" +
"void main(){\n" +
" gl_Position = mVP * vec4(vPos, 1.0);\n" +
" oCol = col;\n" +
"}";
private String FShaderSource =
"precision mediump float;\n" +
"\n" +
"varying vec3 oCol;\n" +
"\n" +
"void main(){\n" +
" gl_FragColor = vec4(oCol, 255);\n" +
"}";
public renderer(Activity a){
this.a = a;
}
public void start(){
v = new GLSurfaceView(this.a);
v.setEGLContextClientVersion(2);
v.setEGLConfigChooser(8, 8, 8, 8, 16, 0);
v.setRenderer(this);
v.setRenderMode(GLSurfaceView.RENDERMODE_CONTINUOUSLY);
a.setContentView(v);
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
Log.w("OGL Renderer", "OnSUfraceCreated Called!");
int vs = glCreateShader(GL_VERTEX_SHADER);
int fs = glCreateShader(GL_FRAGMENT_SHADER);
glShaderSource(vs, VShaderSource);
glCompileShader(vs);
int var[] = new int[1];
glGetShaderiv(vs, GL_COMPILE_STATUS, var, 0);
if(var[0] != GL_TRUE){
Log.e("OGL Shader", "VShader error: " + glGetShaderInfoLog(vs));
}else{
Log.w("OGL Shader", "VShader compiled successfully");
}
glShaderSource(fs, FShaderSource);
glCompileShader(fs);
glGetShaderiv(fs, GL_COMPILE_STATUS, var, 0);
if(var[0] != GL_TRUE){
Log.e("OGL Shader", "FShader error: " + glGetShaderInfoLog(fs));
}else{
Log.w("OGL Shader", "FShader compiled successfully");
}
prg = glCreateProgram();
glAttachShader(prg, vs);
glAttachShader(prg, fs);
glLinkProgram(prg);
glGetProgramiv(prg, GL_LINK_STATUS, var, 0);
if(var[0] != GL_TRUE){
Log.e("OGL Shader", "Linker error: " + glGetProgramInfoLog(prg));
}else{
Log.w("OGL Shader", "Program compiled successfully");
}
glUseProgram(prg);
if(checkGLError()){
Log.e("Error", "GLError during Program initialization");
}
float[] vertices = {-100, -100, -1,
100, -100, -1,
0, 100, -1};
ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4);
vbb.order(ByteOrder.nativeOrder());
FloatBuffer vFb = vbb.asFloatBuffer();
vFb.put(vertices);
vFb.position(0);
float[] colors = {1, 0, 0,
0, 1, 0,
0, 0, 1};
ByteBuffer cbb = ByteBuffer.allocateDirect(colors.length * 4);
cbb.order(ByteOrder.nativeOrder());
FloatBuffer cFb = cbb.asFloatBuffer();
cFb.put(colors);
cFb.position(0);
buffs = new int[2];
glGenBuffers(2, buffs, 0);
if(checkGLError()){
Log.e("Error", "GLError during Buffer generation");
}
glBindBuffer(GL_ARRAY_BUFFER, buffs[0]);
glBufferData(GL_ARRAY_BUFFER, vFb.capacity(), vFb, GL_STATIC_DRAW);
if(checkGLError()){
Log.e("Error", "GLError during GLBufferData 1");
}
glBindBuffer(GL_ARRAY_BUFFER, buffs[1]);
glBufferData(GL_ARRAY_BUFFER, cFb.capacity(), cFb, GL_STATIC_DRAW);
if(checkGLError()){
Log.e("Error", "GLError during GLBufferData 2");
}
int mPos = glGetUniformLocation(prg, "mVP");
float[] projection = new float[16], view = new float[16], mVP = new float[16];
Matrix.setIdentityM(projection, 0);
Matrix.setLookAtM(view, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0);
Matrix.perspectiveM(projection, 0, 90.0f, 16.0f/9.0f, 0.000001f, 1000.0f);
Matrix.multiplyMM(mVP, 0, projection, 0, view, 0);
glUniformMatrix4fv(mPos, 1, false, mVP, 0);
if(checkGLError()){
Log.e("Error", "GLError during matrix load");
}
glEnable(GL_DEPTH_TEST);
glDepthFunc(GL_LEQUAL);
}
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
glViewPort(0, 0, width, height);
}
@Override
public void onDrawFrame(GL10 gl) {
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
int vPos, cPos;
vPos = glGetAttribLocation(prg, "vPos");
if(checkGLError()){
Log.e("Error", "GLError during GetAttribLocation 1");
}
glEnableVertexAttribArray(vPos);
cPos = glGetAttribLocation(prg, "col");
if(checkGLError()){
Log.e("Error", "GLError during GetAttribLocation 2");
}
glEnableVertexAttribArray(cPos);
glBindBuffer(GL_ARRAY_BUFFER, buffs[0]);
glVertexAttribPointer(vPos, 3, GL_FLOAT, false, 0, 0);
if(checkGLError()){
Log.e("Error", "GLError during VertexAttribPointer 1");
}
glBindBuffer(GL_ARRAY_BUFFER, buffs[1]);
glVertexAttribPointer(cPos, 3, GL_FLOAT, false, 0, 0);
if(checkGLError()){
Log.e("Error", "GLError during VertexAttribPointer 2");
}
glDrawArrays(GL_TRIANGLES, 0, 1);
if(checkGLError()){
Log.e("Error", "GLError during DrawArrays");
}
}
}
感谢任何帮助。 -John
编辑我复制了错误的顶点Z位置，它没有改变任何强硬
编辑2 添加了glEnableVertexArrtibArray()来电，但仍无效
答案 0 :(得分：0)
我想我发现了这个问题。我正在创建一个非常大的三角形，使用较小的点（1.0f~10.0f）解决了这个问题。此外，将视图矩阵移动了一点。