使用纯粹GLSL的2D运动模糊和高斯模糊
我希望使用纯粹的GLSL来实现运动模糊或者高斯模糊。
我已经创建了一些基本着色器，并且已经有一些想法。
我的着色器：
顶点着色器：
attribute vec4 a_color;
attribute vec2 a_position;
attribute vec2 a_texCoord0;
uniform mat4 u_projTrans;
varying vec4 v_color;
varying vec2 v_texCoord0;
void main() {
v_color = a_color;
v_texCoord0 = a_texCoord0;
gl_Position = u_projTrans * vec4(a_position, 0.0f, 1.0f);
}
片段着色器：
varying vec4 v_color;
varying vec2 v_texCoord0;
uniform vec2 screenSize;
uniform sampler2D u_texture;
uniform vec4 v_time;
const float RADIUS = 0.75;
const float SOFTNESS = 0.6;
void main() {
vec4 texColor = texture2D(u_texture, v_texCoord0);
vec4 timedColor = (v_color + v_time);
vec2 position = (gl_FragCoord.xy / screenSize.xy) - vec2(0.5);
float len = length(position);
float vignette = smoothstep(RADIUS, RADIUS-SOFTNESS, len);
texColor.rgb = mix(texColor.rgb, texColor.rgb * vignette, 0.5);
gl_FragColor = vec4(texColor.rgb * timedColor.rgb, texColor.a);
}
使用纯粹的GLSL创建模糊是个好主意吗？ 有没有人有任何想法如何做到这一点？
我不妨回答我自己的问题，因为我有一些想法。
我要回答我自己的问题。
最终，我只改变了片段着色器：
varying vec4 vColor;
varying vec2 vTexCoord;
uniform vec2 screenSize;
uniform sampler2D u_texture;
uniform vec4 v_time;
const float RADIUS = 0.75;
const float SOFTNESS = 0.6;
const float blurSize = 1.0/1000.0;
void main() {
vec4 texColor = vec4(0.0); // texture2D(u_texture, vTexCoord)
texColor += texture2D(u_texture, vTexCoord - 4.0*blurSize) * 0.05;
texColor += texture2D(u_texture, vTexCoord - 3.0*blurSize) * 0.09;
texColor += texture2D(u_texture, vTexCoord - 2.0*blurSize) * 0.12;
texColor += texture2D(u_texture, vTexCoord - blurSize) * 0.15;
texColor += texture2D(u_texture, vTexCoord) * 0.16;
texColor += texture2D(u_texture, vTexCoord + blurSize) * 0.15;
texColor += texture2D(u_texture, vTexCoord + 2.0*blurSize) * 0.12;
texColor += texture2D(u_texture, vTexCoord + 3.0*blurSize) * 0.09;
texColor += texture2D(u_texture, vTexCoord + 4.0*blurSize) * 0.05;
vec4 timedColor = (vColor + v_time);
vec2 position = (gl_FragCoord.xy / screenSize.xy) - vec2(0.5);
float len = length(position);
float vignette = smoothstep(RADIUS, RADIUS-SOFTNESS, len);
texColor.rgb = mix(texColor.rgb, texColor.rgb * vignette, 0.5);
gl_FragColor = vec4(texColor.rgb * timedColor.rgb, texColor.a);
}
实际的模糊效果写在这里：
vec4 texColor = vec4(0.0); // texture2D(u_texture, vTexCoord)
texColor += texture2D(u_texture, vTexCoord - 4.0*blurSize) * 0.05;
texColor += texture2D(u_texture, vTexCoord - 3.0*blurSize) * 0.09;
texColor += texture2D(u_texture, vTexCoord - 2.0*blurSize) * 0.12;
texColor += texture2D(u_texture, vTexCoord - blurSize) * 0.15;
texColor += texture2D(u_texture, vTexCoord) * 0.16;
texColor += texture2D(u_texture, vTexCoord + blurSize) * 0.15;
texColor += texture2D(u_texture, vTexCoord + 2.0*blurSize) * 0.12;
texColor += texture2D(u_texture, vTexCoord + 3.0*blurSize) * 0.09;
texColor += texture2D(u_texture, vTexCoord + 4.0*blurSize) * 0.05;
该效果纯粹用GLSL产生高斯模糊。 您可以随时根据自己的喜好调整变量。
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