37 lines
1.4 KiB
Bash
37 lines
1.4 KiB
Bash
precision mediump float;
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uniform sampler2D sTexture;//纹理内容数据
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//接收从顶点着色器过来的参数
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varying vec4 ambient;
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varying vec4 diffuse;
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varying vec4 specular;
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varying vec2 vTexPosition;
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const float maxIterations = 99.0;//最大迭代次数
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const float zoom =0.5;//缩放系数
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const float xCenter = 0.0;//中心坐标位置
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const float yCenter = 0.0;
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const vec3 innerColor = vec3(0.0, 0.0, 1.0);//内部颜色
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const vec3 outerColor1 = vec3(1.0, 0.0, 0.0);//外部颜色1
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const vec3 outerColor2 = vec3(0.0, 1.0, 0.0);//外部颜色2
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void main()
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{
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float real = vTexPosition.x * zoom + xCenter;//变换当前位置
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float imag = vTexPosition.y * zoom + yCenter;
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float cReal = 0.32;//c的实部
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float cImag =0.043;//c的虚部
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float r2 = 0.0;//半径的平方
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float i;//迭代次数
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for(i=0.0; i<maxIterations && r2<4.0; i++){//循环迭代
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float tmpReal = real;//保存当前实部值
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real = (tmpReal * tmpReal) - (imag * imag) +cReal;//计算下一次迭代后实部的值
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imag = 2.0 *tmpReal * imag +cImag;//计算下一次迭代后虚部的值
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r2 = (real * real) + (imag * imag);//计算半径的平方
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}
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vec3 color;
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if(r2 < 4.0){//如果r2未达到4就退出了循环，表明迭代次数已达到最大值
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color = innerColor;//为内部颜色赋值
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}else{//如果因r2大于4.0而退出循环，表明此位置在外部
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color = mix(outerColor1, outerColor2, fract(i * 0.07));//按迭代次数为外部颜色赋不同的值
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}
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vec4 finalColor=vec4(color, 1.0);
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gl_FragColor = finalColor*ambient+finalColor*specular+finalColor*diffuse;
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} |