libgdx g3d模型漫反射+镜面在vivo xplay等机子上glsl编译不过解决办法

Android:
`Vertex shader
ERROR: 0:32: 'a_position' : Only consts can be used in a global initializer
ERROR: 0:70: 'a_normal' : Only consts can be used in a global initializer
ERROR: 0:89: 'a_binormal' : Only consts can be used in a global initializer
ERROR: 0:108: 'a_tangent' : Only consts can be used in a global initializer
ERROR: 0:130: 'a_texCoord0' : Only consts can be used in a global initializer
ERROR: 0:447: ')' : Syntax error: syntax error
ERROR: 6 compilation errors. No code generated.

Fragment shader:
ERROR: 0:206: '(' : Syntax error: syntax error
ERROR: 1 compilation errors. No code generated.

`
我使用的是gdx官方的sample test.glsl，发现在部分手机上，模型的漫反射和镜面无效，查看了一天，并且解决了，有必要分享出来哈，如果用gdx来加载3D模型，需要一些反射镜面光环境映射，模型看起来也会比较生动比较真实一些。

有出现上面的错误日志的，请往下看把哈。
官方g3d glsl地址
https://github.com/libgdx/libgdx/blob/master/tests/gdx-tests-android/assets/data/g3d/shaders/test.glsl

首先解决Only consts can be used in a global initializer：

把 a_position、a_position、a_position、a_tangent、a_texCoord0变量的初始化放到main函数中初始化即可。轻松解决掉5个错误。还剩2个比较棘手。

VS下的'(' : Syntax error:  syntax error导致错误原因是 传递参数的时候调用的方法无效，其实我也不知道为啥，调用方法无效，方法已经定义了，为什么无效，无果，只能手动去把这些方法重新在main中实现一下如下代码：

[VS]#include "g_attributes.glsl:VS"#include "u_uniforms.glsl"#include "skinning.glsl"#include "common.glsl:VS"#include "common.glsl:tangentVectorsVS"#include "lights.glsl:lights"varying vec3 v_lightDir;varying vec3 v_lightCol;varying vec3 v_viewDir;varying vec3 v_ambientLight;#ifdef environmentCubemapFlagvarying vec3 v_reflect;#endif void main() {//初始化    #if defined(positionFlag)    g_position = vec4(a_position, 1.0);    #elseg_position = vec4(0.0, 0.0, 0.0, 1.0);    #endif    #if defined(normalFlag)g_normal = a_normal;    #elseg_normal = vec3(0.0, 0.0, 1.0);    #endif    #if defined(binormalFlag)     g_binormal = a_binormal;    #else     g_binormal = vec3(0.0, 1.0, 0.0);    #endif // binormalFlag#if defined(tangentFlag) g_tangent = a_tangent;#else g_tangent = vec3(1.0, 0.0, 0.0);#endif // tangentFlag#if defined(texCoord0Flag) g_texCoord0 = a_texCoord0;#else g_texCoord0 = vec2(0.0, 0.0);#endif // texCoord0FlagcalculateTangentVectors();g_position = applySkinning(g_position);g_normal = normalize(u_normalMatrix * applySkinning(g_normal));g_binormal = normalize(u_normalMatrix * applySkinning(g_binormal));g_tangent = normalize(u_normalMatrix * applySkinning(g_tangent));g_position = u_worldTrans * g_position;gl_Position = u_projViewTrans * g_position;mat3 worldToTangent;worldToTangent[0] = g_tangent;worldToTangent[1] = g_binormal;worldToTangent[2] = g_normal;v_ambientLight = getAmbient(g_normal);v_lightDir = normalize(-u_dirLights[0].direction) * worldToTangent;v_lightCol = u_dirLights[0].color;vec3 viewDir = normalize(u_cameraPosition.xyz - g_position.xyz);v_viewDir = viewDir * worldToTangent;#ifdef environmentCubemapFlagv_reflect = reflect(-viewDir, g_normal);#endif//pushColor();//pushTexCoord0();//fix    v_color=g_color;    v_texCoord0=g_texCoord0;}

FS中错误点，相对多一点，

//  pullColor();// pullTexCoord0();

//  diffuse = applyColorDiffuse(g_color);

//  vec3 specular = fetchColorSpecular();

同理，需要重新实现这几个方法如下代码：

   g_color = v_color;    g_texCoord0 = v_texCoord0;    vec4 diffuse;     //diffuse = applyColorDiffuse(g_color);     #if defined(diffuseTextureFlag) || defined(diffuseColorFlag)     vec4 fetchDiffuse;     #if defined(diffuseTextureFlag) && defined(diffuseColorFlag)     fetchDiffuse=(texture2D(u_diffuseTexture, g_texCoord0) * u_diffuseColor);     #elif defined(diffuseTextureFlag)     fetchDiffuse= (texture2D(u_diffuseTexture, g_texCoord0));     #elif defined(diffuseColorFlag)     fetchDiffuse=u_diffuseColor;     #else     fetchDiffuse= vec4(1.0);     #endif     diffuse= g_color * fetchDiffuse;     #else     diffuse=g_color;     #endif    //fix vivo xplay6 bug    //vec3 specular = fetchColorSpecular();    vec3 specular;    //g_texCoord0, vec3(0.0)    #if defined(specularTextureFlag) && defined(specularColorFlag)    specular= (texture2D(u_specularTexture, g_texCoord0).rgb * u_specularColor.rgb);    #elif defined(specularTextureFlag)    specular=texture2D(u_specularTexture, g_texCoord0).rgb;    #elif defined(specularColorFlag)    specular=u_specularColor.rgb;    #else    specular= vec3(0.0);    #endif

到此BUG就修复完成，gdx 3d模型加载，不知道还会不会碰到更多的BUG，真心痛苦，后面碰到再说了。