java 使用 OpenGL 替换 Canvas - Android
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Using OpenGL to replace Canvas - Android
提问by Kleptine
I am attempting to replace the Canvas-based rendering system that I already have with the faster opengl-es surface, however, I can't seem to get an openGL renderer to conform in such a way that it acts as 2d field, rather than a perspective view.
我试图用更快的 opengl-es 表面替换我已经拥有的基于 Canvas 的渲染系统，但是，我似乎无法让 openGL 渲染器以这样一种方式符合它作为 2d 场，而不是一个透视图。
My current code for the renderer looks as follows:
我当前的渲染器代码如下所示：
@Override
public void onSurfaceChanged(GL10 gl, int width, int height) {
gl.glViewport(0, 0, width, height);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
gl.glOrthof(0.0f, width, 0.0f, height, 0.0f, 1.0f);
gl.glShadeModel(GL10.GL_FLAT);
gl.glEnable(GL10.GL_BLEND);
gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);
gl.glColor4x(0x10000, 0x10000, 0x10000, 0x10000);
gl.glEnable(GL10.GL_TEXTURE_2D);
}
@Override
public void onSurfaceCreated(GL10 gl, EGLConfig config) {
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
gl.glClearColor(0.5f, 0.5f, 0.5f, 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.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
}
How would I setup the renderer so that the translate transformation would match up with the pixels on the screen? (so translating 5 to the right would move it 5 pixels)
我将如何设置渲染器以便转换转换与屏幕上的像素匹配？（因此将 5 向右平移会将其移动 5 个像素）
回答by Miguel Morales
Please note that in openGL that Y co-ordinate is inverted. Otherwise all is the same.
As for the correct flags, I recommend you check out the open source android game replica island: http://code.google.com/p/replicaisland/
请注意，在 openGL 中，Y 坐标是反转的。否则一切都是一样的。
至于正确的flags，建议你查看开源android游戏副本岛：http: //code.google.com/p/replicaisland/
Here's what I use in my own code:
这是我在自己的代码中使用的内容：
public void onSurfaceChanged(GL10 gl, int width, int height)
{
mViewWidth = width;
mViewHeight = height;
gl.glViewport(0, 0, mViewWidth, mViewHeight);
gl.glLoadIdentity();
GLU.gluOrtho2D(gl, 0, mViewWidth, mViewHeight, 0);
}
public void onSurfaceCreated(GL10 gl, EGLConfig config)
{
gl.glClearColor(0.5f, 0.5f, 0.5f, 1);
gl.glHint(GL10.GL_PERSPECTIVE_CORRECTION_HINT, GL10.GL_FASTEST);
gl.glShadeModel(GL10.GL_FLAT);
gl.glDisable(GL10.GL_DEPTH_TEST);
gl.glEnable(GL10.GL_BLEND);
gl.glBlendFunc(GL10.GL_ONE, GL10.GL_ONE_MINUS_SRC_ALPHA);
gl.glViewport(0, 0, mViewWidth, mViewHeight);
gl.glMatrixMode(GL10.GL_PROJECTION);
gl.glLoadIdentity();
gl.glEnable(GL10.GL_BLEND);
gl.glBlendFunc(GL10.GL_SRC_ALPHA, GL10.GL_ONE_MINUS_SRC_ALPHA);
gl.glShadeModel(GL10.GL_FLAT);
gl.glEnable(GL10.GL_TEXTURE_2D);
GLU.gluOrtho2D(gl, 0, mViewWidth, mViewHeight, 0);
}
Where mViewWidth& mViewHeightare the size of the display.
其中mViewWidth&mViewHeight是显示器的大小。
