利用OpenGL更换帆布 - 机器人 [英] Using OpenGL to replace Canvas - Android

问题描述

我试图取代基于canvas的渲染系统，我已经但是有更快的OpenGL-ES面，我似乎无法得到一个OpenGL渲染器以这样的方式，以符合其作为2D场的，而不是一个透视图。

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.

我目前的code渲染器看起来如下：

My current code for the renderer looks as follows:

     @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);    
    }

我将如何设置渲染器，以使平移变换将匹配与屏幕上的像素？ （所以5翻译向右侧将移动5个像素）

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)

推荐答案

请注意，在OpenGL中的Y坐标反转。否则，一切都是一样的。照片 至于正确的标志，我建议你看看开源的Andr​​oid游戏副本岛： HTTP： //$c$c.google.com/p/replicaisland/

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/

下面是我在我自己的code使用：

Here's what I use in my own code:

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);
}

其中， mViewWidth ＆放大器; mViewHeight 是显示器的尺寸。

Where mViewWidth & mViewHeight are the size of the display.

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