片段着色器中的多紋理。我得到了一個低fps

Question

我用GL20.GL_POINTS陰影圖片。其中一點是可變的（'vKind'代碼）。當屬性發生變化時，我應該同時更改紋理。以下是我的方法。但我得到了一個低fps。我該怎麼辦？任何幫助謝謝！

 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，嘗試，如果紋理確實是什麼使人下來的情況來分析：註釋掉所有，但1紋理上，並且所有的if語句調用相同的紋理。然後，在確認後，考慮兩件事情：

• 既然你是畫點你真的需要一個vKind或varying是一個uniform。您可以使用8個繪製調用，將您的點分成CPU上的8個陣列，具體取決於它們應使用的紋理，然後在片段着色器中僅使用1個紋理，並在8個繪製調用的每一個之前綁定正確的紋理。

• 如果您真的需要所有這些紋理數據，請嘗試查看如何使用atlas（將多個紋理合併爲一個）並嘗試儘可能減少紋理計數。