Method preprocessVertexSource

core/src/processing/opengl/PGL.java:1948–1985

(String[] vertSrc0,
                                                   int version,
                                                   String versionSuffix)

  }

  protected static String[] preprocessVertexSource(String[] vertSrc0,
                                                   int version,
                                                   String versionSuffix) {
    if (containsVersionDirective(vertSrc0)) {
      // The user knows what she or he is doing
      return vertSrc0;
    }

    String[] vertSrc;

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

      vertSrc = preprocessShaderSource(vertSrc0, search, replace, offset);
      vertSrc[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")),
          Pattern.compile(String.format(GLSL_ID_REGEX, "attribute")),
          Pattern.compile(String.format(GLSL_ID_REGEX, "texture")),
          Pattern.compile(String.format(GLSL_FN_REGEX, "texture2DRect|texture2D|texture3D|textureCube"))
      };
      String[] replace = new String[] {
          "out", "in", "texMap", "texture",
      };
      int offset = 1;

      vertSrc = preprocessShaderSource(vertSrc0, search, replace, offset);
      vertSrc[0] = "#version " + version + versionSuffix;
    }

    return vertSrc;
  }


  protected static final String GLSL_ID_REGEX = "(?<![0-9A-Z_a-z])(%s)(?![0-9A-Z_a-z]|\\s*\\()";