GLSL旁路浮陣列均勻

Question

setShaders

muOffsetHandle = getUniformLocation("offset");  
    muWeightHandle = getUniformLocation("weight"); 

useProgram

GLES20.glUniform1fv(muOffsetHandle, 1, mOffset, 0); 
    GLES20.glUniform1fv(muWeightHandle, 1, mWeight, 0); 

瓦爾

private int muOffsetHandle; 
private int muWeightHandle; 

protected float mOffset[] =new float[] {0.0f, 1.3f, 3.3f}; 
protected float mWeight[] =new float[] {0.2f, 0.3f, 0.3f}; 

FragmentShader

 "uniform float offset[3];\n" + 
     "uniform float weight[3];\n" + 

然後試圖達成：重量[I]

我得到這樣的：

着色日誌：0:13：S0004：成員參考或拌和試圖在不可結構和非向量

線13 ：tc += texture2D(uFrameBufferTexture, vTextureCoord[0].xy + vec2(0.0, offset[i])/uScreenHeight).rgb * weight[i];

（i = 0到2）

所以我的問題：如何繞過浮子陣列均勻？浮[3]

代碼

protected static final String mFShader = 
     "precision mediump float;\n" + 
     "varying vec2 vTextureCoord;\n" + 
     "uniform float uTime;\n" + 
     "uniform float uScreenWidth;\n" + 
     "uniform float uScreenHeight;\n" + 
     "uniform sampler2D uFrameBufferTexture;\n"+ 

     "uniform float offset[3];\n" + 
     "uniform float weight[3];\n" + 

     "void main() {\n"+ 
     " vec3 tc = vec3(1.0, 0.0, 0.0);\n"+ 
     " if (vTextureCoord[0].x<(uTime-0.01)) {\n"+ 
     " tc = texture2D(uFrameBufferTexture, vTextureCoord[0].xy).rgb * weight[0];\n"+ 
     " for (int i=1; i<3; i++) {\n"+ 
     "  tc += texture2D(uFrameBufferTexture, vTextureCoord[0].xy + vec2(0.0, offset[i])/uScreenHeight).rgb * weight[i];\n"+ 
     "  tc += texture2D(uFrameBufferTexture, vTextureCoord[0].xy - vec2(0.0, offset[i])/uScreenHeight).rgb * weight[i];\n"+ 
     " }\n"+ 
     " }\n"+ 
     " else if (vTextureCoord[0].x>=(uTime+0.01)) {\n"+ 
     " tc = texture2D(uFrameBufferTexture, vTextureCoord[0].xy).rgb;\n"+ 
     " }\n"+ 
     " gl_FragColor = vec4(tc, 1.0);\n"+ 
     "}\n"; 

Answer 1

的問題是不實際與weight或offset。編譯器抱怨說你說vTextureCoord[0].xy，但你宣稱vTextureCoord爲varying vec2 vTextureCoord;。

要麼聲明vTextureCoord作爲數組，要麼聲明[0]。

Answer 2

你不需要把它聲明爲一個數組，但如果你願意，你可以簡單地使用：

varying vec4 vTextureCoord[3]; // you can use anything you want between the brackets 

另外，不要忘了修改改變頂點着色器也讓他們將是相同的。