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我想我的投影有问题。这是怎么设置我的GL观点:Android OpenGL ES投影:为什么我的原点位于左下角。
@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);
}
}
问题是我的,但是我初始化我投射我在屏幕与Y轴左下角原点向上增加(屏相对)。原点应该是左上角的Y轴向下增加(屏幕相对)。
这不会是一个问题,但作为我从MotionEvent收到的坐标是基于一个topleft角落的起源。
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;
}
}
这只是混淆了我,现在,IM afraif会导致更严重的问题,如果我不解决/明白什么导致了这些问题。
是的,正如我读你的答案,我发现这个http://www.opengl.org/archives/resources/features/KilgardTechniques/oglpitfall/。同样在我的触摸处理程序中,getY和getX让我查看与rawX和rawY相关的相对坐标,这使得屏幕相对。谢谢。 – twDuke 2012-02-05 13:24:08