Opengl简单片段着色器在纹理上覆盖半透明的三角形条

问题描述

我有一个形成三角形的带纹理的三角带.当您单击它时，我希望周围区域被标记为半透明的四边形，以便您仍然可以看到下面的纹理.我的四边形得到正确显示，但它们根本不透明，并且完全覆盖了下面的任何东西.

I have a textured triangle strip that forms a quad. when you click on it i want the surrounding areas to get marked with semi-transparent quads so you can still see the textures underneath. i have the quads getting displayed correctly, but they are not transparent at all and completely cover whatever is underneath.

我有一个非常简单的片段着色器，我认为它可以与glEnable(GL_BLEND)和glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)一起使用:

i have a very simple fragment shader that i thought would work with glEnable(GL_BLEND) and glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA):

#version 130

out vec4 flatColor;

void main(void)
{
    flatColor = vec4(0.0,1.0,0.0,0.5);
}

如果我使用简单的图像对四边形进行纹理处理，则可以很好地处理RGBA(0,255,0,128)，但是我不想为要使用的每种颜色都创建一个纹理，并且希望通过着色器进行处理. /p>

If i texture the quads with a simple image it works fine RGBA(0,255,0,128), but i do not want to have to create a texture for every color I want to use and would like todo it through a shader.

推荐答案

我是个白痴，没有意识到我没有退缩，所以混合变得混乱了.一旦我确定了排序顺序，透明效果就会像我想要的那样发挥作用.

i am an idiot and did not realize i was not drawing back to front so the blending was messed up. once i fixed the sort order the transparency effect worked liked i wanted.

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