Method preprocessFragmentSource

core/src/processing/opengl/PGL.java:1904–1946

(String[] fragSrc0,
                                                     int version,
                                                     String versionSuffix)

  protected static String[] preprocessFragmentSource(String[] fragSrc0,
                                                     int version,
                                                     String versionSuffix) {
    if (containsVersionDirective(fragSrc0)) {
      // The user knows what she or he is doing
      return fragSrc0;
    }

    String[] fragSrc;

    if (version < 130) {
      Pattern[] search = { };
      String[] replace = { };
      int offset = 1;

      fragSrc = preprocessShaderSource(fragSrc0, search, replace, offset);
      fragSrc[0] = "#version " + version + versionSuffix;
    } else {
      // We need to replace 'texture' uniform by 'texMap' uniform and
      // 'textureXXX()' functions by 'texture()' functions. Order of these
      // replacements is important to prevent collisions between these two.
      Pattern[] search = new Pattern[] {
          Pattern.compile(String.format(GLSL_ID_REGEX, "varying|attribute")),
          Pattern.compile(String.format(GLSL_ID_REGEX, "texture")),
          Pattern.compile(String.format(GLSL_FN_REGEX, "texture2DRect|texture2D|texture3D|textureCube")),
          Pattern.compile(String.format(GLSL_ID_REGEX, "gl_FragColor"))
      };
      String[] replace = new String[] {
          "in", "texMap", "texture", "_fragColor"
      };
      int offset = 2;

      fragSrc = preprocessShaderSource(fragSrc0, search, replace, offset);
      fragSrc[0] = "#version " + version + versionSuffix;
      if (" es".equals(versionSuffix)) {
        fragSrc[1] = "out mediump vec4 _fragColor;";
      } else {
        fragSrc[1] = "out vec4 _fragColor;";
      }
    }

    return fragSrc;
  }

  protected static String[] preprocessVertexSource(String[] vertSrc0,
                                                   int version,