1. 升级gradle和cmake版本 2. 优化部分代码

app/build.gradle

@@ -32,7 +32,8 @@ android {
     }
     externalNativeBuild {
         cmake {
-            path file('CMakeLists.txt')
+            path "src/main/cpp/CMakeLists.txt"
+            version "3.10.2"
         }
     }
 }

app/src/main/assets/shaders/fshader_0.glsl

@@ -4,15 +4,30 @@ varying vec2 v_texcoord;
 uniform lowp sampler2D s_textureY;
 uniform lowp sampler2D s_textureU;
 uniform lowp sampler2D s_textureV;
+
+vec4 YuvToRgb(vec2 uv) {
+    //      YUV转RGB
+    //      R = Y + 1.402 * (V - 128)
+    //      G = Y - 0.34414 * (U - 128) - 0.71414 * (V - 128)
+    //      B = Y + 1.772 * (U - 128)
+
+    vec3 yuv;
+    // 只赋值x 则会出现黑白照片效果
+    yuv.x = texture2D(s_textureY, uv).r;
+    // 因为YUV转RGB用的是Y、U-128和V-128，texture函数返回向量值的范围是0-1.0，128表示0.5, 所以要减去0.5
+    yuv.y = texture2D(s_textureU, uv).r - 0.5;
+    yuv.z = texture2D(s_textureV, uv).r - 0.5;
+
+    //  YUV 和 RGB 的转换矩阵
+    highp vec3 rgb =  mat3(
+        1.0, 1.0, 1.0,          //第一列
+        0.0, -0.34414, 1.772,   //第二列
+        1.403, -0.71414, 0.0    //第三列
+    ) * yuv;
+    return vec4(rgb, 1.0);
+}
+
+
 void main() {
-    float y, u, v, r, g, b;
-    y = texture2D(s_textureY, v_texcoord).r;
-    u = texture2D(s_textureU, v_texcoord).r;
-    v = texture2D(s_textureV, v_texcoord).r;
-    u = u - 0.5;
-    v = v - 0.5;
-    r = y + 1.403 * v;
-    g = y - 0.344 * u - 0.714 * v;
-    b = y + 1.770 * u;
-    gl_FragColor = vec4(r, g, b, 1.0);
+    gl_FragColor = YuvToRgb(v_texcoord);
 }

app/src/main/assets/shaders/fshader_1.glsl

@@ -4,18 +4,29 @@ varying vec2 v_texcoord;
 uniform lowp sampler2D s_textureY;
 uniform lowp sampler2D s_textureU;
 uniform lowp sampler2D s_textureV;
+
 vec4 YuvToRgb(vec2 uv) {
-    float y, u, v, r, g, b;
-    y = texture2D(s_textureY, uv).r;
-    u = texture2D(s_textureU, uv).r;
-    v = texture2D(s_textureV, uv).r;
-    u = u - 0.5;
-    v = v - 0.5;
-    r = y + 1.403 * v;
-    g = y - 0.344 * u - 0.714 * v;
-    b = y + 1.770 * u;
-    return vec4(r, g, b, 1.0);
+    //      YUV转RGB
+    //      R = Y + 1.402 * (V - 128)
+    //      G = Y - 0.34414 * (U - 128) - 0.71414 * (V - 128)
+    //      B = Y + 1.772 * (U - 128)
+
+    vec3 yuv;
+    // 只赋值x 则会出现黑白照片效果
+    yuv.x = texture2D(s_textureY, uv).r;
+    // 因为YUV转RGB用的是Y、U-128和V-128，texture函数返回向量值的范围是0-1.0，128表示0.5, 所以要减去0.5
+    yuv.y = texture2D(s_textureU, uv).r - 0.5;
+    yuv.z = texture2D(s_textureV, uv).r - 0.5;
+
+    //  YUV 和 RGB 的转换矩阵
+    highp vec3 rgb =  mat3(
+        1.0, 1.0, 1.0, //第一列
+        0.0, -0.34414, 1.772, //第二列
+        1.403, -0.71414, 0.0//第三列
+    ) * yuv;
+    return vec4(rgb, 1.0);
 }
+
 void main() {
     vec4 sample0, sample1, sample2, sample3;
     float blurStep = 0.5;

app/src/main/assets/shaders/fshader_10.glsl

@@ -14,18 +14,29 @@ float satLevels[kSatLevCount];
 float valLevels[kValLevCount];
 float edge_thres = 0.2;
 float edge_thres2 = 5.0;
+
 vec4 YuvToRgb(vec2 uv) {
-    float y, u, v, r, g, b;
-    y = texture2D(s_textureY, uv).r;
-    u = texture2D(s_textureU, uv).r;
-    v = texture2D(s_textureV, uv).r;
-    u = u - 0.5;
-    v = v - 0.5;
-    r = y + 1.403 * v;
-    g = y - 0.344 * u - 0.714 * v;
-    b = y + 1.770 * u;
-    return vec4(r, g, b, 1.0);
+    //      YUV转RGB
+    //      R = Y + 1.402 * (V - 128)
+    //      G = Y - 0.34414 * (U - 128) - 0.71414 * (V - 128)
+    //      B = Y + 1.772 * (U - 128)
+
+    vec3 yuv;
+    // 只赋值x 则会出现黑白照片效果
+    yuv.x = texture2D(s_textureY, uv).r;
+    // 因为YUV转RGB用的是Y、U-128和V-128，texture函数返回向量值的范围是0-1.0，128表示0.5, 所以要减去0.5
+    yuv.y = texture2D(s_textureU, uv).r - 0.5;
+    yuv.z = texture2D(s_textureV, uv).r - 0.5;
+
+    //  YUV 和 RGB 的转换矩阵
+    highp vec3 rgb =  mat3(
+        1.0, 1.0, 1.0, //第一列
+        0.0, -0.34414, 1.772, //第二列
+        1.403, -0.71414, 0.0//第三列
+    ) * yuv;
+    return vec4(rgb, 1.0);
 }
+
 vec3 RGBtoHSV(float r, float g, float b) {
     float minv, maxv, delta;
     vec3 res;
@@ -41,32 +52,33 @@ vec3 RGBtoHSV(float r, float g, float b) {
         return res;
     }
     if (r == maxv)
-    res.x = ( g - b ) / delta;
+    res.x = (g - b) / delta;
     else if (g == maxv)
-    res.x = 2.0 + ( b - r ) / delta;
+    res.x = 2.0 + (b - r) / delta;
     else
-    res.x = 4.0 + ( r - g ) / delta;
+    res.x = 4.0 + (r - g) / delta;
     res.x = res.x * 60.0;
-    if(res.x < 0.0)
+    if (res.x < 0.0)
     res.x = res.x + 360.0;
     return res;
 }
-vec3 HSVtoRGB(float h, float s, float v ) {
+
+vec3 HSVtoRGB(float h, float s, float v) {
     int i;
     float f, p, q, t;
     vec3 res;
-    if(s == 0.0) {
+    if (s == 0.0) {
         res.x = v;
         res.y = v;
         res.z = v;
         return res;
     }
     h /= 60.0;
-    i = int(floor( h ));
+    i = int(floor(h));
     f = h - float(i);
-    p = v * ( 1.0 - s );
-    q = v * ( 1.0 - s * f );
-    t = v * ( 1.0 - s * ( 1.0 - f ) );
+    p = v * (1.0 - s);
+    q = v * (1.0 - s * f);
+    t = v * (1.0 - s * (1.0 - f));
     if (i == 0) {
         res.x = v;
         res.y = t;
@@ -94,12 +106,13 @@ vec3 HSVtoRGB(float h, float s, float v ) {
     }
     return res;
 }
+
 float nearestLevel(float col, int mode) {
     int levCount;
     if (mode==0) levCount = kHueLevCount;
     if (mode==1) levCount = kSatLevCount;
     if (mode==2) levCount = kValLevCount;
-    for (int i=0; i<levCount-1; i++ ) {
+    for (int i=0; i<levCount-1; i++) {
         if (mode==0) {
             if (col >= hueLevels[i] && col <= hueLevels[i+1]) {
                 return hueLevels[i+1];
@@ -118,27 +131,31 @@ float nearestLevel(float col, int mode) {
     }
     return 0.0;
 }
+
 float avgIntensity(vec4 pix) {
     return (pix.r + pix.g + pix.b)/3.;
 }
+
 vec4 getPixel(vec2 coords, float dx, float dy) {
     return YuvToRgb(coords + vec2(dx, dy));
 }
+
 float IsEdge(in vec2 coords) {
     float dxtex = 1.0 / float(texSize.x);
     float dytex = 1.0 / float(texSize.y);
     float pix[9];
     int k = -1;
     float delta;
     for (int i=-1; i<2; i++) {
-        for(int j=-1; j<2; j++) {
+        for (int j=-1; j<2; j++) {
             k++;
-            pix[k] = avgIntensity(getPixel(coords,float(i)*dxtex, float(j)*dytex));
+            pix[k] = avgIntensity(getPixel(coords, float(i)*dxtex, float(j)*dytex));
         }
     }
     delta = (abs(pix[1]-pix[7]) + abs(pix[5]-pix[3]) + abs(pix[0]-pix[8])+ abs(pix[2]-pix[6]))/4.;
-    return clamp(edge_thres2*delta,0.0,1.0);
+    return clamp(edge_thres2*delta, 0.0, 1.0);
 }
+
 void main() {
     hueLevels[0] = 0.0;
     hueLevels[1] = 140.0;
@@ -159,11 +176,11 @@ void main() {
     valLevels[3] = 1.0;
     vec2 uv = v_texcoord;
     vec3 color = YuvToRgb(uv).rgb;
-    vec3 vHSV =  RGBtoHSV(color.r, color.g, color.b);
+    vec3 vHSV = RGBtoHSV(color.r, color.g, color.b);
     vHSV.x = nearestLevel(vHSV.x, 0);
     vHSV.y = nearestLevel(vHSV.y, 1);
     vHSV.z = nearestLevel(vHSV.z, 2);
     float edg = IsEdge(uv);
-    vec3 vRGB = (edg >= edge_thres) ? vec3(0.0,0.0,0.0) : HSVtoRGB(vHSV.x,vHSV.y,vHSV.z);
+    vec3 vRGB = (edg >= edge_thres) ? vec3(0.0, 0.0, 0.0) : HSVtoRGB(vHSV.x, vHSV.y, vHSV.z);
     gl_FragColor = vec4(vRGB.x, vRGB.y, vRGB.z, 1.0);
 }

app/src/main/assets/shaders/fshader_11.glsl

@@ -5,24 +5,38 @@ varying vec2 v_texcoord;
 uniform lowp sampler2D s_textureY;
 uniform lowp sampler2D s_textureU;
 uniform lowp sampler2D s_textureV;
+
+vec4 YuvToRgb(vec2 uv) {
+    //      YUV转RGB
+    //      R = Y + 1.402 * (V - 128)
+    //      G = Y - 0.34414 * (U - 128) - 0.71414 * (V - 128)
+    //      B = Y + 1.772 * (U - 128)
+
+    vec3 yuv;
+    // 只赋值x 则会出现黑白照片效果
+    yuv.x = texture2D(s_textureY, uv).r;
+    // 因为YUV转RGB用的是Y、U-128和V-128，texture函数返回向量值的范围是0-1.0，128表示0.5, 所以要减去0.5
+    yuv.y = texture2D(s_textureU, uv).r - 0.5;
+    yuv.z = texture2D(s_textureV, uv).r - 0.5;
+
+    //  YUV 和 RGB 的转换矩阵
+    highp vec3 rgb =  mat3(
+        1.0, 1.0, 1.0, //第一列
+        0.0, -0.34414, 1.772, //第二列
+        1.403, -0.71414, 0.0//第三列
+    ) * yuv;
+    return vec4(rgb, 1.0);
+}
+
 void main() {
-    float y, u, v, r, g, b;
-    y = texture2D(s_textureY, v_texcoord).r;
-    u = texture2D(s_textureU, v_texcoord).r;
-    v = texture2D(s_textureV, v_texcoord).r;
-    u = u - 0.5;
-    v = v - 0.5;
-    r = y + 1.403 * v;
-    g = y - 0.344 * u - 0.714 * v;
-    b = y + 1.770 * u;
-    vec3 color = vec3(r, g, b);
+    vec3 color = YuvToRgb(v_texcoord).rgb;
     vec2 uv = v_texcoord.xy;
     vec3 colors[3];
     colors[0] = vec3(0.,0.,1.);
     colors[1] = vec3(1.,1.,0.);
     colors[2] = vec3(1.,0.,0.);
     float lum = (color.r + color.g + color.b)/3.;
     int idx = (lum < 0.5) ? 0 : 1;
-    vec3 rgb = mix(colors[idx],colors[idx+1],(lum-float(idx)*0.5)/0.5);
+    vec3 rgb = mix(colors[idx],colors[idx + 1],(lum - float(idx) * 0.5) / 0.5);
     gl_FragColor = vec4(rgb, 1.0);
 }

app/src/main/assets/shaders/fshader_12.glsl

@@ -6,18 +6,29 @@ uniform lowp sampler2D s_textureY;
 uniform lowp sampler2D s_textureU;
 uniform lowp sampler2D s_textureV;
 uniform vec2 texSize;
+
 vec4 YuvToRgb(vec2 uv) {
-    float y, u, v, r, g, b;
-    y = texture2D(s_textureY, uv).r;
-    u = texture2D(s_textureU, uv).r;
-    v = texture2D(s_textureV, uv).r;
-    u = u - 0.5;
-    v = v - 0.5;
-    r = y + 1.403 * v;
-    g = y - 0.344 * u - 0.714 * v;
-    b = y + 1.770 * u;
-    return vec4(r, g, b, 1.0);
+    //      YUV转RGB
+    //      R = Y + 1.402 * (V - 128)
+    //      G = Y - 0.34414 * (U - 128) - 0.71414 * (V - 128)
+    //      B = Y + 1.772 * (U - 128)
+
+    vec3 yuv;
+    // 只赋值x 则会出现黑白照片效果
+    yuv.x = texture2D(s_textureY, uv).r;
+    // 因为YUV转RGB用的是Y、U-128和V-128，texture函数返回向量值的范围是0-1.0，128表示0.5, 所以要减去0.5
+    yuv.y = texture2D(s_textureU, uv).r - 0.5;
+    yuv.z = texture2D(s_textureV, uv).r - 0.5;
+
+    //  YUV 和 RGB 的转换矩阵
+    highp vec3 rgb =  mat3(
+        1.0, 1.0, 1.0, //第一列
+        0.0, -0.34414, 1.772, //第二列
+        1.403, -0.71414, 0.0//第三列
+    ) * yuv;
+    return vec4(rgb, 1.0);
 }
+
 void main() {
     vec4 color;
     color.rgb = vec3(0.5);