lua中编写shader的方式

1. 字符串拼接

类似于下面这种

vertDefaultSource = "\n".."\n" ..

                  "attribute vec4 a_position;\n" ..

                  "attribute vec2 a_texCoord;\n" ..

                  "attribute vec4 a_color;\n\n" ..

                  "\n#ifdef GL_ES\n" ..

                  "varying lowp vec4 v_fragmentColor;\n" ..

                  "varying mediump vec2 v_texCoord;\n" ..

                  "\n#else\n" ..

                  "varying vec4 v_fragmentColor;" ..

                  "varying vec2 v_texCoord;" ..

                  "\n#endif\n" ..

                  "void main()\n" ..

                  "{\n" ..

                  "   gl_Position = CC_MVPMatrix * a_position;\n"..

                  "   v_fragmentColor = a_color;\n"..

                  "   v_texCoord = a_texCoord;\n" ..

                  "} \n"

2. 双括号字符串方式[[]]

kShaderDefaultVsh = [[

attribute vec4 a_position;

attribute vec2 a_texCoord;

attribute vec4 a_color;

#ifdef GL_ES

varying mediump vec4 v_fragmentColor;

varying mediump vec2 v_texCoord;

#else

varying vec4 v_fragmentColor;

varying vec2 v_texCoord;

#endif

void main()

{

    gl_Position = CC_PMatrix * a_position;

    v_fragmentColor = a_color;

    v_texCoord = a_texCoord;

}

]]

上面这两种方式都可以，感觉第二种方便点。