5
我有一个具有以下属性的片段着色器:glGetUniformLocation返回-1的OpenGL ES(iPhone)
varying highp vec2 coordinate;
precision mediump float;
uniform sampler2D videoframe;
uniform sampler2D videosprite;
uniform vec4 mask;
uniform float threshold;
我得到他们的位置,后来设置它们:
_frame = glGetUniformLocation(_program, "videoframe");
_sprite = glGetUniformLocation(_program, "videosprite");
_mask = glGetUniformLocation(_program, "mask");
_threshold = glGetUniformLocation(_program, "threshold");
NSLog(@"%i %i %i %i", _frame, _sprite, _mask, _threshold);
但是,日志揭示:0 2 1 -1
从文档,我看到-1(门槛统一)意味着它失败。为什么失败? 谢谢
哇...即使我知道这一点,谢谢你的提醒。这是问题... – 0xSina 2012-03-22 18:31:44