所以我正在使用 OpenGL ES 1.0 为 Android 制作一个应用程序。我的问题是使用 GL_TRIANGLES 绘制的对象不会在 Android 3.x 或 4.x 上显示，但在 2.x 上一切正常。之前有什么要启用或禁用的吗？
带有 GL_TRIANGLES (Model.java) 的文件：
public class Model() {
private FloatBuffer vertexBuffer;
private ByteBuffer indexBuffer;
private FloatBuffer colorBuffer;
byte indices[] = {0, 1, 2};
float vertices[];
float colors[] = {1.0f, 1.0f, 1.0f, 1.0f};
public load(int resid, Context context) {
ModelLoader.load(context, resid);
vertices = ModelLoader.vertices();
colors = ModelLoader.colors();
ByteBuffer vbb = ByteBuffer.allocateDirect(vertices.length * 4);
vbb.order(ByteOrder.nativeOrder());
vertexBuffer = vbb.asFloatBuffer();
vertexBuffer.put(vertices);
vertexBuffer.position(0);
ByteBuffer cbb = ByteBuffer.allocateDirect(colors.length * 4);
cbb.order(ByteOrder.nativeOrder());
colorBuffer = cbb.asFloatBuffer();
colorBuffer.put(colors);
colorBuffer.position(0);
indexBuffer = ByteBuffer.allocateDirect(indices.length);
indexBuffer.put(indices);
indexBuffer.position(0);
}
public void draw(GL10 gl) {
gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);
gl.glVertexPointer(3, GL10.GL_FLOAT, 0, vertexBuffer);
gl.glEnableClientState(GL10.GL_COLOR_ARRAY);
gl.glDrawArrays(GL10.GL_TRIANGLES, 0, vertices.length / 3);
gl.glDisableClientState(GL10.GL_VERTEX_ARRAY);
gl.glDisableClientState(GL10.GL_COLOR_ARRAY);
}
}
带有渲染的文件（GLRender.java）：
public class GLRender extends GLSurfaceView.Renderer {
public Model sample = new Model();
public void onSurfaceChanged(GL10 gl, int w, int h) {
if(h==0) h=1;
float aspect = (float)w/h;
gl.glViewport(0, 0, w, h);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
GLU.gluPerspective(gl, 45, aspect, 0.1f, 100.0f);
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glLoadIdentity();
}
public void onSurfaceCreated(GL10 gl, EGLConfig glc) {
gl.glClearColor(0, 0, 0, 1.0f);
gl.glClearDepthf(1.0f);
gl.glEnable(GL10.GL_DEPTH_TEST);
gl.glDisable(GL10.GL_CULL_FACE);
gl.glDepthFunc(GL10.GL_LEQUAL);
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_NICEST);
gl.glShadeModel(GL10.GL_SMOOTH);
gl.glDisable(GL10.GL_DITHER);
gl.glEnable(GL10.GL_LIGHTING);
gl.glEnable(GL10.GL_LIGHT0);
gl.glEnable(GL10.GL_COLOR_MATERIAL);
gl.glEnable(GL10.GL_TEXTURE_2D);
gl.glEnable(GL10.GL_BLEND);}
public void onDrawFrame(GL10 gl) {
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
gl.glLoadIdentity(); // Reset model-view matrix ( NEW )
gl.glMatrixMode(GL10.GL_MODELVIEW);
gl.glPushMatrix();
sample.draw(gl);
gl.glPopMatrix();
}
}
我认为这就足够了。
上面的代码没有问题。它有效（至少在 Honeycomb 上）。