片段着色器:着色器中没有名称统一的着色器 [英] Fragment shader: No uniform with name in shader

问题描述

我在libgdx中的片段着色器有问题.下面是我的片段着色器.

I have problem with fragment shader in libgdx. Below is my fragment shader.

#ifdef GL_ES
precision mediump float;
#endif
uniform float u_aspectRatio;
varying vec2 v_texCoords;
uniform sampler2D u_texture;     
void main()                 
{                       
  gl_FragColor = texture2D(u_texture, v_texCoords);
}

我在程序中完成

shader.setUniformi("u_texture", 0); // work fine
shader.setUniformf("u_aspectRatio", 0.0f); //no uniform with name 'u_aspectRatio' in shader

shader.isCompiled()返回true，并且第一个设置工作正常，但是第二个错误是着色器中没有名称'u_aspectRatio'的统一制服".如果删除行:

shader.isCompiled() return true and first set work fine, but in second I have error "no uniform with name 'u_aspectRatio' in shader". If delete line:

uniform float u_aspectRatio;

从着色器都可以正常工作，但是当我添加此行时(在功能上我要使用此对象)并尝试设置一些我有错误的数据.

from shader all work fine, but when I add this line(in feature I want work with this object) and try set some data I have error.

推荐答案

着色器编译器将优化未使用的制服，因此在运行时不存在u_aspectRatio制服.参见 http://ogltotd.blogspot.com/2007/12/active-shader-uniforms-and-vertex.html

The shader compiler will optimize away unused uniforms, so there is no u_aspectRatio uniform at run-time. See http://ogltotd.blogspot.com/2007/12/active-shader-uniforms-and-vertex.html

修复"此着色器的另一种方法是在某个位置使用变量(例如，将v_texCoords乘以该变量).

The other way to "fix" this shader would be to use the variable somewhere (e.g., multiply v_texCoords by it).

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