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uniform sampler2D colorBuffer;
uniform sampler2D depthBuffer;
/* current frame */
uniform mat4 currInvViewProjMatrix;
/* past frame frame */
uniform mat4 pastViewProjMatrix;
in vec4 uvcoordsvar;
out vec4 FragColor;
#define MAX_SAMPLE 64
uniform int samples;
float wang_hash_noise(uint s)
{
uint seed = (uint(gl_FragCoord.x) * 1664525u + uint(gl_FragCoord.y)) + s;
seed = (seed ^ 61u) ^ (seed >> 16u);
seed *= 9u;
seed = seed ^ (seed >> 4u);
seed *= 0x27d4eb2du;
seed = seed ^ (seed >> 15u);
float value = float(seed);
value *= 1.0 / 4294967296.0;
return fract(value);
}
void main()
{
vec3 ndc_pos;
ndc_pos.xy = uvcoordsvar.xy;
ndc_pos.z = texture(depthBuffer, uvcoordsvar.xy).x;
float inv_samples = 1.0 / float(samples);
float noise = 2.0 * wang_hash_noise(0u) * inv_samples;
/* Normalize Device Coordinates are [-1, +1]. */
ndc_pos = ndc_pos * 2.0 - 1.0;
vec4 p = currInvViewProjMatrix * vec4(ndc_pos, 1.0);
vec3 world_pos = p.xyz / p.w; /* Perspective divide */
/* Now find where was this pixel position
* inside the past camera viewport */
vec4 old_ndc = pastViewProjMatrix * vec4(world_pos, 1.0);
old_ndc.xyz /= old_ndc.w; /* Perspective divide */
vec2 motion = (ndc_pos.xy - old_ndc.xy) * 0.25; /* 0.25 fit cycles ref */
float inc = 2.0 * inv_samples;
float i = -1.0 + noise;
FragColor = vec4(0.0, 0.0, 0.0, 1.0);
for (int j = 0; j < samples && j < MAX_SAMPLE; j++) {
FragColor += texture(colorBuffer, uvcoordsvar.xy + motion * i) * inv_samples;
i += inc;
}
}
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