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142 changes: 142 additions & 0 deletions
142
canvasgl/src/main/java/com/chillingvan/canvasgl/textureFilter/GaussianBlurFilter.java
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,142 @@ | ||
| package com.chillingvan.canvasgl.textureFilter; | ||
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| import android.opengl.GLES20; | ||
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| import com.chillingvan.canvasgl.ICanvasGL; | ||
| import com.chillingvan.canvasgl.OpenGLUtil; | ||
| import com.chillingvan.canvasgl.glcanvas.BasicTexture; | ||
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| import java.util.ArrayList; | ||
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| public class GaussianBlurFilter extends FilterGroup { | ||
| public static class GaussianFilter extends BasicTextureFilter { | ||
| private float blurSize; | ||
| private int dir; | ||
| public static final String TEXEL_WIDTH_OFFSET = "texelWidthOffset"; | ||
| public static final String TEXEL_HEIGHT_OFFSET = "texelHeightOffset"; | ||
| public static final String BLUR_COORDINATES = "blurCoordinates"; | ||
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| public GaussianFilter(int dir, float blurSize) { | ||
| this.dir = dir; | ||
| this.blurSize = blurSize; | ||
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| } | ||
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| public GaussianFilter(int dir) { | ||
| this(dir, 1f); | ||
| } | ||
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| public static final String VERTEX_SHADER = | ||
| "precision mediump float;\n" + | ||
| "uniform mat4 " + MATRIX_UNIFORM + ";\n" + | ||
| "uniform mat4 " + TEXTURE_MATRIX_UNIFORM + ";\n" + | ||
| "attribute vec2 " + POSITION_ATTRIBUTE + ";\n" + | ||
| "const int GAUSSIAN_SAMPLES = 9;\n" + | ||
| "\n" + | ||
| "uniform float " + TEXEL_WIDTH_OFFSET + ";\n" + | ||
| "uniform float " + TEXEL_HEIGHT_OFFSET + ";\n" + | ||
| "\n" + | ||
| "varying vec2 " + VARYING_TEXTURE_COORD + ";\n" + | ||
| "varying vec2 " + BLUR_COORDINATES + "[GAUSSIAN_SAMPLES];\n" + | ||
| "\n" + | ||
| "void main()\n" + | ||
| "{\n" + | ||
| " vec4 pos = vec4(" + POSITION_ATTRIBUTE + ", 0.0, 1.0);\n" + | ||
| " gl_Position = " + MATRIX_UNIFORM + "* pos;\n" + | ||
| VARYING_TEXTURE_COORD + " = (" + TEXTURE_MATRIX_UNIFORM + " * pos).xy;\n" + | ||
| " \n" + | ||
| " int multiplier = 0;\n" + | ||
| " vec2 blurStep;\n" + | ||
| " vec2 singleStepOffset = vec2(" + TEXEL_HEIGHT_OFFSET + ", " + TEXEL_WIDTH_OFFSET + ");\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" + | ||
| " " + BLUR_COORDINATES + "[i] = " + VARYING_TEXTURE_COORD + ".xy + blurStep;\n" + | ||
| " }\n" + | ||
| "}\n"; | ||
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| public static final String FRAGMENT_SHADER = | ||
| "uniform sampler2D " + TEXTURE_SAMPLER_UNIFORM + ";\n" + | ||
| "\n" + | ||
| "const lowp int GAUSSIAN_SAMPLES = 9;\n" + | ||
| "\n" + | ||
| "varying highp vec2 " + VARYING_TEXTURE_COORD + ";\n" + | ||
| "varying highp vec2 " + BLUR_COORDINATES + "[GAUSSIAN_SAMPLES];\n" + | ||
| "\n" + | ||
| "void main()\n" + | ||
| "{\n" + | ||
| " lowp vec3 sum = vec3(0.0);\n" + | ||
| " lowp vec4 fragColor=texture2D(" + TEXTURE_SAMPLER_UNIFORM + "," + VARYING_TEXTURE_COORD + ");\n" + | ||
| " \n" + | ||
| " sum += texture2D(" + TEXTURE_SAMPLER_UNIFORM + ", " + BLUR_COORDINATES + "[0]).rgb * 0.05;\n" + | ||
| " sum += texture2D(" + TEXTURE_SAMPLER_UNIFORM + ", " + BLUR_COORDINATES + "[1]).rgb * 0.09;\n" + | ||
| " sum += texture2D(" + TEXTURE_SAMPLER_UNIFORM + ", " + BLUR_COORDINATES + "[2]).rgb * 0.12;\n" + | ||
| " sum += texture2D(" + TEXTURE_SAMPLER_UNIFORM + ", " + BLUR_COORDINATES + "[3]).rgb * 0.15;\n" + | ||
| " sum += texture2D(" + TEXTURE_SAMPLER_UNIFORM + ", " + BLUR_COORDINATES + "[4]).rgb * 0.18;\n" + | ||
| " sum += texture2D(" + TEXTURE_SAMPLER_UNIFORM + ", " + BLUR_COORDINATES + "[5]).rgb * 0.15;\n" + | ||
| " sum += texture2D(" + TEXTURE_SAMPLER_UNIFORM + ", " + BLUR_COORDINATES + "[6]).rgb * 0.12;\n" + | ||
| " sum += texture2D(" + TEXTURE_SAMPLER_UNIFORM + ", " + BLUR_COORDINATES + "[7]).rgb * 0.09;\n" + | ||
| " sum += texture2D(" + TEXTURE_SAMPLER_UNIFORM + ", " + BLUR_COORDINATES + "[8]).rgb * 0.05;\n" + | ||
| "\n" + | ||
| " gl_FragColor = vec4(sum,fragColor.a);\n" + | ||
| "}"; | ||
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| @Override | ||
| public String getVertexShader() { | ||
| return VERTEX_SHADER; | ||
| } | ||
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| @Override | ||
| public String getFragmentShader() { | ||
| return FRAGMENT_SHADER; | ||
| } | ||
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| @Override | ||
| public void onPreDraw(int program, BasicTexture texture, ICanvasGL canvas) { | ||
| super.onPreDraw(program, texture, canvas); | ||
| int widthOffsetLocation = GLES20.glGetUniformLocation(program, TEXEL_WIDTH_OFFSET); | ||
| int heightOffsetLocation = GLES20.glGetUniformLocation(program, TEXEL_HEIGHT_OFFSET); | ||
| if (dir == 0) { | ||
| OpenGLUtil.setFloat(widthOffsetLocation, blurSize / texture.getWidth()); | ||
| OpenGLUtil.setFloat(heightOffsetLocation, 0); | ||
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| } else { | ||
| OpenGLUtil.setFloat(widthOffsetLocation, 0); | ||
| OpenGLUtil.setFloat(heightOffsetLocation, blurSize / texture.getHeight()); | ||
| } | ||
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| } | ||
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| public void setBlurSize(float blurSize) { | ||
| this.blurSize = blurSize; | ||
| } | ||
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| } | ||
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| public GaussianBlurFilter(float blurSize) { | ||
| super(new ArrayList<TextureFilter>()); | ||
| mFilters.add(new GaussianFilter(0, blurSize)); | ||
| mFilters.add(new GaussianFilter(1, blurSize)); | ||
| updateMergedFilters(); | ||
| } | ||
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| public void setBlurSize(float blurSize) { | ||
| for (TextureFilter textureFilter : mFilters) { | ||
| if (textureFilter instanceof GaussianFilter) { | ||
| GaussianFilter gaussianFilter = (GaussianFilter) textureFilter; | ||
| gaussianFilter.setBlurSize(blurSize); | ||
| } | ||
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| } | ||
| } | ||
| } |
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