opengl es2を勉強する。その7 画像をぼかす

http://xissburg.com/faster-gaussian-blur-in-glsl/

こちらを参考にして、

画像をぼかすには（横方向のみですが）

private String fragmentShaderCode =
                 "precision mediump float;" +
                 "varying vec2 v_texCoord;" +
                 "uniform sampler2D s_texture;" +
                 "uniform float Opacity;" +
                 "uniform float Distance;" +
                 "void main() {" +
                     "vec4 sum = vec4(0.0);" +
                         "gl_FragColor = vec4(0.0);" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(-0.028*Distance, 0.0))*0.0044299121055113265;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(-0.024*Distance, 0.0))*0.00895781211794;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(-0.020*Distance, 0.0))*0.0215963866053;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(-0.016*Distance, 0.0))*0.0443683338718;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(-0.012*Distance, 0.0))*0.0776744219933;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(-0.008*Distance, 0.0))*0.115876621105;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(-0.004*Distance, 0.0))*0.147308056121;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord)*0.159576912161;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(0.004*Distance, 0.0))*0.147308056121;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(0.008*Distance, 0.0))*0.115876621105;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(0.012*Distance, 0.0))*0.0776744219933;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(0.016*Distance, 0.0))*0.0443683338718;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(0.020*Distance, 0.0))*0.0215963866053;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(0.024*Distance, 0.0))*0.00895781211794;" +
                         "gl_FragColor += texture2D(s_texture, v_texCoord+vec2(0.028*Distance, 0.0))*0.0044299121055113265;" +
                         "gl_FragColor = vec4( gl_FragColor.r,gl_FragColor.g,gl_FragColor.b,gl_FragColor.a*Opacity );" +
                 "}";

にする

GLES20.glUniform1f(GLES20.glGetUniformLocation(shaderProgram, "Distance"), 2.0f);

みたいにfloatの値を入力する事でボケるのだけど、値が大きいとボケの密度が高すぎるのでボケでなくなってしまうので、小さい値を入れておく。

ここは使い方の１つ。という事でちょっと特異的な事ですが、アップしてみました