在做Android的OpenGL的精灵点的工作？ [英] Do OpenGL Point Sprites work in Android?

问题描述

我开发上的Droid，版本2.1 UPDATE1。我支持GL扩展包括GL_OES_point_sprite和GL_OES_point_size_array。

I'm developing on a Droid, version 2.1-update1. My supported GL extensions include GL_OES_point_sprite and GL_OES_point_size_array.

我无法得到点精灵渲染。下面的code。在glTexEnvi调用抛出UnsupportedOperationException从GLWrapperBase。如果我禁用纹理和所有注释掉glTexEnvi，它抛出同样的异常进一步下跌，在glPointSizePointerOES（）。

I am unable to get point sprites to render. The code below throws UnsupportedOperationException from GLWrapperBase at the glTexEnvi call. If I disable textures and comment out the glTexEnvi all, it throws the same exception further down, at glPointSizePointerOES().

是点精灵在适当支持的Andr​​oid？有没有人得到了他们的工作吗？还是有我的低于code的一个问题？

Are point sprites properly supported in Android? Has anyone gotten them working? Or is there an issue with my code below?

// Note that gl is cast to GL11
gl.glEnable(GL11.GL_TEXTURE_2D);
gl.glEnable(GL11.GL_BLEND);
gl.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
gl.glDepthMask(false);
gl.glEnable(GL11.GL_POINT_SPRITE_OES);
gl.glTexEnvi( GL11.GL_POINT_SPRITE_OES, GL11.GL_COORD_REPLACE_OES, GL11.GL_TRUE );  
gl.glEnableClientState(GL11.GL_VERTEX_ARRAY);
gl.glVertexPointer(2, GL11.GL_SHORT, 0, .vertBuffer);
gl.glEnableClientState(GL11.GL_POINT_SIZE_ARRAY_OES);
gl.glPointSizePointerOES(GL11.GL_FLOAT, 0, pointSizeBuffer);

感谢

推荐答案

我得到这个工作，这是我画的功能

I got this working, here is my draw function

初​​始化一切

    gl.glEnable(GL10.GL_TEXTURE);
    TextureManager.activateTexture(gl, R.drawable.water1); //Don't look for this, it's not public api, just looks upd texture id for android resource if loaded, and then activates it. it's the gl.glBindTexture() call replacement
    gl.glEnable(GL11.GL_POINT_SPRITE_OES);
    gl.glEnableClientState(GL11.GL_POINT_SIZE_ARRAY_BUFFER_BINDING_OES);
    gl.glEnableClientState(GL11.GL_POINT_SIZE_ARRAY_OES);       
    gl.glEnableClientState(GL11.GL_POINT_SPRITE_OES);
    gl.glEnableClientState(GL10.GL_VERTEX_ARRAY);

设置纹理的环境为使用点精灵

Set the texture environment up to use point sprites

    gl.glTexEnvf(GL11.GL_POINT_SPRITE_OES, GL11.GL_COORD_REPLACE_OES, GL11.GL_TRUE);

设定指针的数据（初阵列二维布置[X，Y，X2，Y2，...]第二是天[S1，S2，..）

Set up pointers to the data (First array is 2d laid out [x,y,x2,y2,...] second is 1d [s1,s2,..])

    gl.glVertexPointer(2,GL11.GL_FLOAT,0,PosData);              
    ((GL11)(gl)).glPointSizePointerOES(GL10.GL_FLOAT, 0, SizeData);

绘图

    gl.glDrawArrays(GL10.GL_POINTS,0,MAX);

禁用的东西

    gl.glDisableClientState(GL11.GL_VERTEX_ARRAY);
    gl.glDisableClientState(GL11.GL_POINT_SIZE_ARRAY_OES);
    gl.glDisableClientState(GL11.GL_POINT_SIZE_ARRAY_BUFFER_BINDING_OES);
    gl.glDisableClientState(GL11.GL_POINT_SIZE_ARRAY_OES);      
    gl.glDisable(GL10.GL_TEXTURE);

在我的初始化我只有我的投影设置和启用GL_BLEND进行混合。我认为你需要GL_COLOR_MATERIAL如果你想你的色彩精灵。

In my initializer I only have my projection setup and GL_BLEND enabled for blending. I think you would need GL_COLOR_MATERIAL if you wanted to color your sprite.

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