我对所有这些着色器都是新手,而且我只是想替换 LibGDX 中的默认 SpriteBatch 渲染器。
我复制粘贴了默认着色器并尝试添加鼠标制服,但它在着色器中给了我“没有名称为“u_mouse”的制服。
这是所有相关代码:
String vertexShader = "attribute vec4 " + ShaderProgram.POSITION_ATTRIBUTE + ";\n" //
+ "attribute vec4 " + ShaderProgram.COLOR_ATTRIBUTE + ";\n" //
+ "attribute vec2 " + ShaderProgram.TEXCOORD_ATTRIBUTE + "0;\n" //
+ "uniform mat4 u_projTrans;\n" //
+ "uniform vec2 u_mouse;\n" //
+ "varying vec4 v_color;\n" //
+ "varying vec2 v_texCoords;\n" //
+ "\n" //
+ "void main()\n" //
+ "{\n" //
+ " v_color = u_mouse * " + ShaderProgram.COLOR_ATTRIBUTE + ";\n" //
+ " v_texCoords = " + ShaderProgram.TEXCOORD_ATTRIBUTE + "0;\n" //
+ " gl_Position = u_projTrans * " + ShaderProgram.POSITION_ATTRIBUTE + ";\n" //
+ "}\n";
String fragmentShader =
"#ifdef GL_ES\n" //
+ "#define LOWP lowp\n" //
+ "precision mediump float;\n" //
+ "#else\n" //
+ "#define LOWP \n" //
+ "#endif\n" //
+ "varying LOWP vec4 v_color;\n" //
+ "varying vec2 v_texCoords;\n" //
+ "uniform sampler2D u_texture;\n" //
+ "uniform vec2 u_mouse;\n" //
+ "void main()\n"//
+ "{\n" //
+ " gl_FragColor = v_color * texture2D(u_texture, u_mouse);\n" //
+ "}";
ShaderProgram shaderTest = new ShaderProgram(vertexShader, fragmentShader);
shaderTest.setUniformf("u_mouse", Gdx.input.getX(), Gdx.input.getY());
这是堆栈跟踪:
Exception in thread "LWJGL Application" com.badlogic.gdx.utils.GdxRuntimeException: java.lang.IllegalArgumentException: no uniform with name 'u_mouse' in shader
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:113)
Caused by: java.lang.IllegalArgumentException: no uniform with name 'u_mouse' in shader
at com.badlogic.gdx.graphics.glutils.ShaderProgram.fetchUniformLocation(ShaderProgram.java:283)
at com.badlogic.gdx.graphics.glutils.ShaderProgram.setUniformf(ShaderProgram.java:394)
at com.nehatchick.games.wf.WhiteMountains.render(WhiteMountains.java:424)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication.mainLoop(LwjglApplication.java:187)
at com.badlogic.gdx.backends.lwjgl.LwjglApplication$1.run(LwjglApplication.java:110)