我认为我的投影存在问题。这就是我设置gl视图的方式:
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
_displayWidth = width;
_displayHeight = height;
_halfWidth = width / 2;
_halfHeight = height / 2;
_scaleX = 0.5F;
_scaleY = 0.5F;
gl.glViewport(0, 0, _displayWidth, _displayHeight);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
GLU.gluOrtho2D(gl, 0, _displayWidth, _displayHeight, 0);
DebugLog.i(TAG, "Size changed: " + _displayWidth + " * "
+ _displayHeight);
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
GlSystem.setGl(gl);
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
gl.glClearColor(0.0f, 0.0f, 0.0f, 1);
gl.glShadeModel(GL10.GL_FLAT);
gl.glDisable(GL10.GL_DEPTH_TEST);
gl.glEnable(GL10.GL_TEXTURE_2D);
gl.glDisable(GL10.GL_DITHER);
gl.glDisable(GL10.GL_LIGHTING);
gl.glEnable(GL10.GL_BLEND);
gl.glBlendFunc(GL10.GL_ONE, GL10.GL_ONE_MINUS_SRC_ALPHA);
gl.glTexEnvx(GL10.GL_TEXTURE_ENV, GL10.GL_TEXTURE_ENV_MODE,
GL10.GL_MODULATE);
gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
String extensions = gl.glGetString(GL10.GL_EXTENSIONS);
String version = gl.glGetString(GL10.GL_VERSION);
String renderer = gl.glGetString(GL10.GL_RENDERER);
boolean isSoftwareRenderer = renderer.contains("PixelFlinger");
boolean isOpenGL10 = version.contains("1.0");
boolean supportsDrawTexture = extensions.contains("draw_texture");
boolean supportsVBOs = !isSoftwareRenderer
&& (!isOpenGL10 || extensions.contains("vertex_buffer_object"));
DebugLog.i(TAG, version + " (" + renderer + "): "
+ (supportsDrawTexture ? "draw texture," : "")
+ (supportsVBOs ? "vbos" : ""));
_game.load();
}
图:
public void draw(float x, float y, float scaleX, float scaleY) {
GL10 gl = GlSystem.getGl();
if (gl != null && _sprite != null) {
gl.glBindTexture(GL10.GL_TEXTURE_2D, _sprite.getTexture());
float localX = x - (getWidth() * scaleX) / 2;
float localY = y - (getHeight() * scaleY) / 2;
float width = getWidth() * scaleX;
float height = getHeight() * scaleY;
((GL11Ext) gl).glDrawTexfOES(localX, localY, 0, width, height);
}
}
问题是我然而我初始化我的投影我来自屏幕的左下角,Y轴向上(屏幕相对)。原点应该是左上角Y轴向下增加(屏幕相对)。
这不会是一个问题,但是我从MotionEvent收到的坐标是基于一个topleft corner原点。
public class GameView extends GLSurfaceView {
private TouchHandler _motionHandler;
public GameView(Context context) {
super(context);
}
@Override
public boolean onTouchEvent(MotionEvent e) {
_motionHandler.setMotionEvent(e);
queueEvent(_motionHandler);
return true;
}
public TouchHandler getMotionHandler() {
return _motionHandler;
}
public void setMotionHandler(TouchHandler motionHandler) {
_motionHandler = motionHandler;
}
}
这只是让我感到困惑,如果我不解决/了解导致这些问题的原因,它会导致更严重的问题。
答案 0 :(得分:0)
在opengl中,默认情况下左下角是默认的原点。