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Fix: Plane Deform mask retains original alpha

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The Plane Deform mask output retains the original alpha of the input
image, while it should be a binary mask. This patch ignores the alpha of
the image and uses a binary mask instead.
This commit is contained in:
Omar Emara
2024-01-19 12:59:31 +02:00
parent f384622343
commit d537e63fa6
1 changed files with 13 additions and 2 deletions
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15
source/blender/compositor/realtime_compositor/shaders/compositor_plane_deform_motion_blur.glsl
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@@ -12,6 +12,7 @@ void main()
ivec2 output_size = max(imageSize(output_img), imageSize(mask_img));
vec2 coordinates = (vec2(texel) + vec2(0.5)) / vec2(output_size);
float accumulated_mask = 0.0;
vec4 accumulated_color = vec4(0.0);
for (int i = 0; i < number_of_motion_blur_samples; i++) {
mat3 homography_matrix = mat3(homography_matrices[i]);
@@ -25,11 +26,21 @@ void main()
vec2 x_gradient = homography_matrix[0].xy / transformed_coordinates.z;
vec2 y_gradient = homography_matrix[1].xy / transformed_coordinates.z;
accumulated_color += textureGrad(input_tx, projected_coordinates, x_gradient, y_gradient);
vec4 sampled_color = textureGrad(input_tx, projected_coordinates, x_gradient, y_gradient);
accumulated_color += sampled_color;
/* The plane mask is 1 if it is inside the plane and 0 otherwise. However, we use the alpha
* value of the sampled color for pixels outside of the plane to utilize the anti-aliasing
* effect of the anisotropic filtering. Therefore, the input_tx sampler should use anisotropic
* filtering and be clamped to zero border color. */
bool is_inside_plane = all(greaterThanEqual(projected_coordinates, vec2(0.0))) &&
all(lessThanEqual(projected_coordinates, vec2(1.0)));
accumulated_mask += is_inside_plane ? 1.0 : sampled_color.a;
}
accumulated_mask /= number_of_motion_blur_samples;
accumulated_color /= number_of_motion_blur_samples;
imageStore(output_img, texel, accumulated_color);
imageStore(mask_img, texel, accumulated_color.aaaa);
imageStore(mask_img, texel, vec4(accumulated_mask));
}