问题
In other words, emulating the old opengl flat shading model, so you could for example have a line strip where each segment is a distinct color rather than an interpolation of color across the segment?
回答1:
Not directly. GLSL for Desktop has the flat keyword, but GLSL ES doesn't have it (it's reserved). A trick to emulate this behaviour is to assign the same color at each vertex in a triangle (or in a segment), so the interpolation is between the same value.
来源：https://stackoverflow.com/questions/3409516/in-opengl-es-2-is-there-a-way-to-prevent-interpolation-of-varyings