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61 lines
1.6 KiB
GLSL
61 lines
1.6 KiB
GLSL
#ifndef ACRYLIC_BLUR_FS
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#define ACRYLIC_BLUR_FS
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#include "sh_Utils.h"
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#undef INV_SQRT_2PI
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#define INV_SQRT_2PI 0.39894
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layout(location = 2) in mediump vec2 v_TexCoord;
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layout(std140, set = 0, binding = 0) uniform m_BlurParameters
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{
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mediump vec2 g_TexSize;
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int g_Radius;
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mediump float g_Sigma;
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highp vec2 g_BlurDirection;
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};
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layout(set = 1, binding = 0) uniform lowp texture2D m_Texture;
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layout(set = 1, binding = 1) uniform lowp sampler m_Sampler;
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layout(location = 0) out vec4 o_Colour;
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mediump float computeGauss(in mediump float x, in mediump float sigma)
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{
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return INV_SQRT_2PI * exp(-0.5*x*x / (sigma*sigma)) / sigma;
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}
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lowp vec4 blur(int radius, highp vec2 direction, mediump vec2 texCoord, mediump vec2 texSize, mediump float sigma)
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{
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mediump vec4 sum = vec4(0.0);
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mediump float totalWeight = 0.0;
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// 中心像素
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mediump float weight = computeGauss(0.0, sigma);
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sum += texture(sampler2D(m_Texture, m_Sampler), texCoord) * weight;
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totalWeight += weight;
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// 对称采样 - 修复采样位置和权重
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for (int i = 1; i <= radius; ++i)
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{
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// 使用正确的采样位置（1, 2, 3... 而不是1.5, 3.5...）
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mediump float x = float(i);
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weight = computeGauss(x, sigma);
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sum += texture(sampler2D(m_Texture, m_Sampler), texCoord + direction * x / texSize) * weight;
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sum += texture(sampler2D(m_Texture, m_Sampler), texCoord - direction * x / texSize) * weight;
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totalWeight += 2.0 * weight;
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}
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return sum / totalWeight;
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}
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void main(void)
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{
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// 应用模糊
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vec4 blurredColour = blur(g_Radius, g_BlurDirection, v_TexCoord, g_TexSize, g_Sigma);
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o_Colour = blurredColour;
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}
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#endif |