1 files changed, 21 insertions, 0 deletions
diff --git a/source/blender/compositor/realtime_compositor/shaders/compositor_directional_blur.glsl b/source/blender/compositor/realtime_compositor/shaders/compositor_directional_blur.glsl
new file mode 100644
index 00000000000..1805cb5a7f5
--- /dev/null
+++ b/source/blender/compositor/realtime_compositor/shaders/compositor_directional_blur.glsl
@@ -0,0 +1,21 @@
+#pragma BLENDER_REQUIRE(gpu_shader_compositor_texture_utilities.glsl)
+
+void main()
+{
+  ivec2 texel = ivec2(gl_GlobalInvocationID.xy);
+  ivec2 input_size = texture_size(input_tx);
+
+  /* Add 0.5 to evaluate the input sampler at the center of the pixel. */
+  vec2 coordinates = vec2(texel) + vec2(0.5);
+
+  /* For each iteration, accumulate the input at the normalize coordinates, hence the divide by
+   * input size, then transform the coordinates for the next iteration. */
+  vec4 accumulated_color = vec4(0.0);
+  for (int i = 0; i < iterations; i++) {
+    accumulated_color += texture(input_tx, coordinates / input_size);
+    coordinates = (mat3(inverse_transformation) * vec3(coordinates, 1.0)).xy;
+  }
+
+  /* Write the accumulated color divided by the number of iterations. */
+  imageStore(output_img, texel, accumulated_color / iterations);
+}