source/blender/draw/engines/eevee/shaders/eevee_film_resolve_frag.glsl


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#pragma BLENDER_REQUIRE(eevee_film_lib.glsl)

layout(std140) uniform film_block
{
  FilmData film;
};

uniform sampler2D data_tx;
uniform sampler2D weight_tx;
uniform sampler2D first_sample_tx;

in vec4 uvcoordsvar;

layout(location = 0) out vec4 out_color;

void main(void)
{
  vec2 uv = uvcoordsvar.xy;

  vec4 color = textureLod(data_tx, uv, 0.0);
  float weight = textureLod(weight_tx, uv, 0.0).r;

  out_color = film_data_decode(film, color, weight);

  /* First sample is stored in a fullscreen buffer. */
  vec2 uv_first_sample = ((uv * film.extent) + film.offset) /
                         vec2(textureSize(first_sample_tx, 0).xy);
  vec4 first_sample = textureLod(first_sample_tx, uv_first_sample, 0.0);
  out_color = mix(first_sample, out_color, film.opacity);
}