Rename PShader to PShaderOpenGL and extract PShader interface.

Author: tychedelia

core/src/processing/core/PGraphics.java

@@ -47,7 +47,6 @@
 import java.util.concurrent.TimeUnit;
 
 import processing.opengl.PGL;
-import processing.opengl.PShader;
 
 /**
  *

core/src/processing/core/PShader.java

@@ -0,0 +1,113 @@
+/* -*- mode: java; c-basic-offset: 2; indent-tabs-mode: nil -*- */
+
+/*
+  Part of the Processing project - http://processing.org
+
+  Copyright (c) 2012-21 The Processing Foundation
+  Copyright (c) 2004-12 Ben Fry and Casey Reas
+  Copyright (c) 2001-04 Massachusetts Institute of Technology
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation, version 2.1.
+
+  This library is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  Lesser General Public License for more details.
+
+  You should have received a copy of the GNU Lesser General
+  Public License along with this library; if not, write to the
+  Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+  Boston, MA  02111-1307  USA
+*/
+
+package processing.core;
+
+/**
+ * This class encapsulates a shader program, including a vertex and a fragment
+ * shader. It is the renderer-agnostic type that sketches declare and pass to
+ * <b>shader()</b> and <b>filter()</b>; each renderer supplies its own
+ * implementation (for example a GLSL-backed shader under P2D/P3D, or a WGSL
+ * one under the WebGPU renderer).
+ *
+ * Use the <b>loadShader()</b> function to load your shader code, rather than
+ * constructing a renderer-specific implementation directly.
+ *
+ * @webref rendering:shaders
+ * @webBrief This class encapsulates a shader program, including a vertex and a
+ *           fragment shader
+ */
+public interface PShader {
+
+  /**
+   * Sets the uniform variables inside the shader to modify the effect while the
+   * program is running.
+   *
+   * @webref rendering:shaders
+   * @webBrief Sets a variable within the shader
+   * @param name the name of the uniform variable to modify
+   * @param x first component of the variable to modify
+   */
+  void set(String name, int x);
+
+  /**
+   * @param y second component of the variable to modify. The variable has to be declared with an array/vector type in the shader (i.e.: int[2], vec2)
+   */
+  void set(String name, int x, int y);
+
+  /**
+   * @param z third component of the variable to modify. The variable has to be declared with an array/vector type in the shader (i.e.: int[3], vec3)
+   */
+  void set(String name, int x, int y, int z);
+
+  /**
+   * @param w fourth component of the variable to modify. The variable has to be declared with an array/vector type in the shader (i.e.: int[4], vec4)
+   */
+  void set(String name, int x, int y, int z, int w);
+
+  void set(String name, float x);
+  void set(String name, float x, float y);
+  void set(String name, float x, float y, float z);
+  void set(String name, float x, float y, float z, float w);
+
+  /**
+   * @param vec modifies all the components of an array/vector uniform variable. PVector can only be used if the type of the variable is vec3.
+   */
+  void set(String name, PVector vec);
+
+  void set(String name, boolean x);
+  void set(String name, boolean x, boolean y);
+  void set(String name, boolean x, boolean y, boolean z);
+  void set(String name, boolean x, boolean y, boolean z, boolean w);
+
+  void set(String name, int[] vec);
+
+  /**
+   * @param ncoords number of coordinates per element, max 4
+   */
+  void set(String name, int[] vec, int ncoords);
+
+  void set(String name, float[] vec);
+  void set(String name, float[] vec, int ncoords);
+
+  void set(String name, boolean[] vec);
+  void set(String name, boolean[] boolvec, int ncoords);
+
+  /**
+   * @param mat matrix of values
+   */
+  void set(String name, PMatrix2D mat);
+
+  void set(String name, PMatrix3D mat);
+
+  /**
+   * @param use3x3 enforces the matrix is 3 x 3
+   */
+  void set(String name, PMatrix3D mat, boolean use3x3);
+
+  /**
+   * @param tex sets the sampler uniform variable to read from this image texture
+   */
+  void set(String name, PImage tex);
+}