Lubos Lenco
33 lines
931 B
GLSL
33 lines
931 B
GLSL
#version 450
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uniform sampler2D tex;
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uniform sampler2D tex2;
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uniform sampler2D sveloc;
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in vec2 tex_coord;
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out vec4 frag_color;
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const float SMAA_REPROJECTION_WEIGHT_SCALE = 30.0;
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void main() {
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vec4 current = textureLod(tex, tex_coord, 0.0);
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// Velocity is assumed to be calculated for motion blur, so we need to inverse it for reprojection
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vec2 velocity = -textureLod(sveloc, tex_coord, 0.0).rg;
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#ifdef GLSL
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#else
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velocity.y = -velocity.y;
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#endif
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// Reproject current coordinates and fetch previous pixel
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vec4 previous = textureLod(tex2, tex_coord + velocity, 0.0);
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// Attenuate the previous pixel if the velocity is different
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float delta = abs(current.a * current.a - previous.a * previous.a) / 5.0;
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float weight = 0.5 * clamp(1.0 - sqrt(delta) * SMAA_REPROJECTION_WEIGHT_SCALE, 0.0, 1.0);
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// Blend the pixels according to the calculated weight:
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frag_color = vec4(mix(current.rgb, previous.rgb, weight), 1.0);
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}
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