片段着色器中的多纹理。我得到了一个低fps

Question

我用GL20.GL_POINTS阴影图片。其中一点是可变的（'vKind'代码）。当属性发生变化时，我应该同时更改纹理。以下是我的方法。但我得到了一个低fps。我该怎么办？任何帮助谢谢！

 final String fragmentShader = "precision highp float;\n" 
      + "uniform sampler2D u_texture0;\n" // diffuse texture for 
      + "uniform sampler2D u_texture1;\n" // diffuse texture for 
      + "uniform sampler2D u_texture2;\n" // diffuse texture for 
      + "uniform sampler2D u_texture3;\n" // diffuse texture for 
      + "uniform sampler2D u_texture4;\n" // diffuse texture for 
      + "uniform sampler2D u_texture5;\n" // diffuse texture for 
      + "uniform sampler2D u_texture6;\n" // diffuse texture for 
      + "uniform sampler2D u_texture7;\n" // diffuse texture for 
      + "varying float vRotation;\n" 
      + "varying float vKind;\n" 
      + "varying vec4 vColor;\n" // input color from vertex shader 
      + "void main() {\n" 
      + "highp vec2 center = vec2(0.5, 0.5);\n" 
      // Translate the center of the point the origin. 
      + "highp vec2 centeredPoint = gl_PointCoord - center;\n" 
      // Create a rotation matrix using the provided angle 
      + "highp mat2 rotation = mat2(cos(vRotation), sin(vRotation),\n" 
      + "-sin(vRotation), cos(vRotation)); \n" 
      // Perform the rotation. 
      + "centeredPoint = centeredPoint*rotation ;\n" 
      // Translate the point back to its original position and use 
      // that point 
      // to get your texture color. 
      + "if(vKind==0.0)\n" 
      + "gl_FragColor = texture2D(u_texture0, centeredPoint + center);\n" 
      + "else if(vKind==1.0)\n" 
      + "gl_FragColor = texture2D(u_texture1, centeredPoint + center);\n" 
      + "else if(vKind==2.0)\n" 
      + "gl_FragColor = texture2D(u_texture2, centeredPoint + center);\n" 
      + "else if(vKind==3.0)\n" 
      + "gl_FragColor = texture2D(u_texture3, centeredPoint + center);\n" 
      + "else if(vKind==4.0)\n" 
      + "gl_FragColor = texture2D(u_texture4, centeredPoint + center);\n" 
      + "else if(vKind==5.0)\n" 
      + "gl_FragColor = texture2D(u_texture5, centeredPoint + center);\n" 
      + "else if(vKind==6.0)\n" 
      + "gl_FragColor = texture2D(u_texture6, centeredPoint + center);\n" 
      + "else\n" 
      + "gl_FragColor = texture2D(u_texture7, centeredPoint + center);\n" 
      + "gl_FragColor *= vColor;\n" 

      // + 
      // " gl_FragColor.a = (gl_FragColor.b >= 0.5) ? gl_FragColor.a : 0.0;\n" 
      + "}\n"; 

Answer 1

首先，尝试，如果纹理确实是什么使人下来的情况来分析：注释掉所有，但1纹理上，并且所有的if语句调用相同的纹理。然后，在确认后，考虑两件事情：

• 既然你是画点你真的需要一个vKind或varying是一个uniform。您可以使用8个绘制调用，将您的点分成CPU上的8个阵列，具体取决于它们应使用的纹理，然后在片段着色器中仅使用1个纹理，并在8个绘制调用的每一个之前绑定正确的纹理。

• 如果您真的需要所有这些纹理数据，请尝试查看如何使用atlas（将多个纹理合并为一个）并尝试尽可能减少纹理计数。