在OpenGL ES中，如何加载具有透明像素的纹理? [英] In OpenGL ES, how do I load a texture that has transparent pixels?

问题描述

然后正确显示?一个示例是将一个圆形的球放置在一个矩形中，同时能够在背景中看到另一个纹理.

And then have display correctly? An example would be having a round ball in a rectangle while being able to see another texture in the background.

目前，当我加载纹理时，源图像中的透明像素显示为黑色.

edit: At the moment, when I load the texture the transparent pixels from the source image are displayed as black.

推荐答案

适用于iPhone和N95:

For iPhone and N95 this works:

如果要从原始数据加载纹理，请将内部和源格式设置为GL_RGBA.

If you are loading texture from raw data, set internal and source format to GL_RGBA.

glTexImage2D(GL_TEXTURE_2D, 0, 
    GL_RGBA,
    textureWidth,
    textureHeight, 
    0, 
    GL_RGBA,
    GL_UNSIGNED_BYTE,
    pointerToPixels);

然后在渲染时启用alpha混合:

And when rendering, enable alpha blend:

glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
glEnable(GL_BLEND);

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