#lua中编写shader的方式

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。