35 lines
925 B
GLSL
35 lines
925 B
GLSL
#version 440 core
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layout(set = 0, binding = 0)
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uniform texture2D t_src_color;
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layout(set = 0, binding = 1)
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uniform sampler s_src_color;
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layout(set = 0, binding = 2)
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uniform u_locals {
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vec2 halfpixel;
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};
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layout(location = 0) in vec2 uv;
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layout(location = 0) out vec4 tgt_color;
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vec4 simplesample(vec2 uv) {
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return textureLod(sampler2D(t_src_color, s_src_color), uv, 0);
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}
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// From: https://community.arm.com/cfs-file/__key/communityserver-blogs-components-weblogfiles/00-00-00-20-66/siggraph2015_2D00_mmg_2D00_marius_2D00_notes.pdf
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vec4 downsample(vec2 uv, vec2 halfpixel) {
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vec4 sum = simplesample(uv) * 4.0;
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sum += simplesample(uv - halfpixel.xy);
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sum += simplesample(uv + halfpixel.xy);
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sum += simplesample(uv + vec2(halfpixel.x, -halfpixel.y));
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sum += simplesample(uv - vec2(halfpixel.x, -halfpixel.y));
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return sum / 8.0;
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}
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void main() {
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tgt_color = downsample(uv, halfpixel);
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}
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