关于 ios：iPad Opengl ES 程序在模拟器上运行良好，但在设备上运行良好

iPad Opengl ES program works fine on simulator but not device

对于设备，我所有的着色器都可以正常加载，除了一个。对于这个着色器程序，当我调用 glGetProgramInfoLog(...);

时，我收到"片段程序无法使用当前上下文状态编译"错误，然后是顶点着色器的类似错误

顶点着色器：

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#version 100

uniform mat4 Projection;
uniform mat4 Modelview;
uniform mat4 Rotation;
uniform vec3 Translation;

uniform vec4 LightDirection;
uniform vec4 MaterialDiffuse;
uniform float MaterialShininess;

attribute vec3 position;
attribute vec3 normal;

varying vec4 color;
varying float specularCoefficient;

void main() {
vec3 _normal = normalize(mat3(Modelview[0].xyz, Modelview[1].xyz, Modelview[2].xyz)*normal);
// There is an easier way to do the above using typecast, but is apparently broken

float NdotL = dot(-_normal, normalize(vec3(LightDirection)));
if(NdotL < 0.0){
NdotL = 0.0;
}
color = NdotL * MaterialDiffuse;
float NdotO = dot(-_normal, vec3(0.0, 0.0, -1.0));
if(NdotO < 0.0){
NdotO = 0.0;
}
specularCoefficient = pow(NdotO, MaterialShininess);

vec3 p = position + Translation;
gl_Position = Projection*Modelview*vec4(p, 1.0);
}

片段着色器：

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#version 100
precision mediump float;

varying vec4 color;
varying float specularCoefficient;
uniform vec4 MaterialSpecular;

void main(){
gl_FragColor = vec4((color + specularCoefficient*MaterialSpecular).rgb, 1.0);
}

我不确定发生了什么，特别是因为我有一个与上面完全相同的类似程序，并添加了纹理坐标。另外，当我使用 glGetShaderiv(theShader, GL_COMPILE_STATUS,