我尝试将两个着色器组合在一起，通过Android中的新版本OpenGL（2014年12月更新）创建流畅的颜色但不起作用。以下是Shader：
高斯模糊
顶点着色器：
public static final String VERTEX_SHADER =
"attribute vec4 position;\n" +
"attribute vec4 inputTextureCoordinate;\n" +
"\n" +
"const int GAUSSIAN_SAMPLES = 9;\n" +
"\n" +
"uniform float texelWidthOffset;\n" +
"uniform float texelHeightOffset;\n" +
"\n" +
"varying vec2 textureCoordinate;\n" +
"varying vec2 blurCoordinates[GAUSSIAN_SAMPLES];\n" +
"\n" +
"void main()\n" +
"{\n" +
" gl_Position = position;\n" +
" textureCoordinate = inputTextureCoordinate.xy;\n" +
" \n" +
" // Calculate the positions for the blur\n" +
" int multiplier = 0;\n" +
" vec2 blurStep;\n" +
" vec2 singleStepOffset = vec2(texelHeightOffset, texelWidthOffset);\n" +
" \n" +
" for (int i = 0; i < GAUSSIAN_SAMPLES; i++)\n" +
" {\n" +
" multiplier = (i - ((GAUSSIAN_SAMPLES - 1) / 2));\n" +
" // Blur in x (horizontal)\n" +
" blurStep = float(multiplier) * singleStepOffset;\n" +
" blurCoordinates[i] = inputTextureCoordinate.xy + blurStep;\n" +
" }\n" +
"}\n";
Fragment Shader：
public static final String FRAGMENT_SHADER =
"uniform sampler2D inputImageTexture;\n" +
"\n" +
"const lowp int GAUSSIAN_SAMPLES = 9;\n" +
"\n" +
"varying highp vec2 textureCoordinate;\n" +
"varying highp vec2 blurCoordinates[GAUSSIAN_SAMPLES];\n" +
"\n" +
"void main()\n" +
"{\n" +
" lowp vec3 sum = vec3(0.0);\n" +
" lowp vec4 fragColor=texture2D(inputImageTexture,textureCoordinate);\n" +
" \n" +
" sum += texture2D(inputImageTexture, blurCoordinates[0]).rgb * 0.05;\n" +
" sum += texture2D(inputImageTexture, blurCoordinates[1]).rgb * 0.09;\n" +
" sum += texture2D(inputImageTexture, blurCoordinates[2]).rgb * 0.12;\n" +
" sum += texture2D(inputImageTexture, blurCoordinates[3]).rgb * 0.15;\n" +
" sum += texture2D(inputImageTexture, blurCoordinates[4]).rgb * 0.18;\n" +
" sum += texture2D(inputImageTexture, blurCoordinates[5]).rgb * 0.15;\n" +
" sum += texture2D(inputImageTexture, blurCoordinates[6]).rgb * 0.12;\n" +
" sum += texture2D(inputImageTexture, blurCoordinates[7]).rgb * 0.09;\n" +
" sum += texture2D(inputImageTexture, blurCoordinates[8]).rgb * 0.05;\n" +
"\n" +
" gl_FragColor = vec4(sum,fragColor.a);\n" +
"}";
对比：
NO_Vertext_Shader
和片段着色器：
public static final String CONTRAST_FRAGMENT_SHADER = ""
+ "varying highp vec2 textureCoordinate;\n"
+ " \n"
+ " uniform sampler2D inputImageTexture;\n"
+ " uniform lowp float contrast;\n"
+ " \n"
+ " void main()\n"
+ " {\n"
+ " lowp vec4 textureColor = texture2D(inputImageTexture, textureCoordinate);\n"
+ " \n"
+ " gl_FragColor = vec4(((textureColor.rgb - vec3(0.5)) * contrast + vec3(0.5)), textureColor.w);\n"
+ " }";
我怎么能这样做？，我可以结合一些着色器，但在这种情况下它很难
抱歉我的英语不好。
更新
如果使用两个锐化着色器（使用高斯模糊着色器合并锐化着色器），我该如何合并：
两个锐化着色器
顶点着色器：
public static final String SHARPEN_VERTEX_SHADER = "" +
"attribute vec4 position;\n" +
"attribute vec4 inputTextureCoordinate;\n" +
"\n" +
"uniform float imageWidthFactor; \n" +
"uniform float imageHeightFactor; \n" +
"uniform float sharpness;\n" +
"\n" +
"varying vec2 textureCoordinate;\n" +
"varying vec2 leftTextureCoordinate;\n" +
"varying vec2 rightTextureCoordinate; \n" +
"varying vec2 topTextureCoordinate;\n" +
"varying vec2 bottomTextureCoordinate;\n" +
"\n" +
"varying float centerMultiplier;\n" +
"varying float edgeMultiplier;\n" +
"\n" +
"void main()\n" +
"{\n" +
" gl_Position = position;\n" +
" \n" +
" mediump vec2 widthStep = vec2(imageWidthFactor, 0.0);\n" +
" mediump vec2 heightStep = vec2(0.0, imageHeightFactor);\n" +
" \n" +
" textureCoordinate = inputTextureCoordinate.xy;\n" +
" leftTextureCoordinate = inputTextureCoordinate.xy - widthStep;\n" +
" rightTextureCoordinate = inputTextureCoordinate.xy + widthStep;\n" +
" topTextureCoordinate = inputTextureCoordinate.xy + heightStep; \n" +
" bottomTextureCoordinate = inputTextureCoordinate.xy - heightStep;\n" +
" \n" +
" centerMultiplier = 1.0 + 4.0 * sharpness;\n" +
" edgeMultiplier = sharpness;\n" +
"}";
片段着色器：
public static final String SHARPEN_FRAGMENT_SHADER = "" +
"precision highp float;\n" +
"\n" +
"varying highp vec2 textureCoordinate;\n" +
"varying highp vec2 leftTextureCoordinate;\n" +
"varying highp vec2 rightTextureCoordinate; \n" +
"varying highp vec2 topTextureCoordinate;\n" +
"varying highp vec2 bottomTextureCoordinate;\n" +
"\n" +
"varying highp float centerMultiplier;\n" +
"varying highp float edgeMultiplier;\n" +
"\n" +
"uniform sampler2D inputImageTexture;\n" +
"\n" +
"void main()\n" +
"{\n" +
" mediump vec3 textureColor = texture2D(inputImageTexture, textureCoordinate).rgb;\n" +
" mediump vec3 leftTextureColor = texture2D(inputImageTexture, leftTextureCoordinate).rgb;\n" +
" mediump vec3 rightTextureColor = texture2D(inputImageTexture, rightTextureCoordinate).rgb;\n" +
" mediump vec3 topTextureColor = texture2D(inputImageTexture, topTextureCoordinate).rgb;\n" +
" mediump vec3 bottomTextureColor = texture2D(inputImageTexture, bottomTextureCoordinate).rgb;\n" +
"\n" +
" gl_FragColor = vec4((textureColor * centerMultiplier - (leftTextureColor * edgeMultiplier + rightTextureColor * edgeMultiplier + topTextureColor * edgeMultiplier + bottomTextureColor * edgeMultiplier)), texture2D(inputImageTexture, bottomTextureCoordinate).w);\n" +
"}";
答案 0 :(得分：0)
为什么这种情况很难？在我看来，你需要做的就是在高斯模糊输出上使用对比度。这意味着您需要将高斯模糊片段着色器的最后一行（在主体中）与对比度着色器中的第一行合并为：
lowp vec4 textureColor = vec4(sum,fragColor.a);
在着色器顶部添加uniform lowp float contrast;。除此之外，你将所有这些都保留在此行上方的模糊着色器中，并且全部来自此行下方的对比度着色器：
uniform lowp float contrast;
//.. insert Gaussian shader till gl_FragColor..
lowp vec4 textureColor = vec4(sum,fragColor.a);
gl_FragColor = vec4(((textureColor.rgb - vec3(0.5)) * contrast + vec3(0.5)), textureColor.w);
}