Realtime Compositor: Implement dilate erode node

This patch implements the dilate/erode node for the realtime compositor.

Differential Revision: https://developer.blender.org/D15790

Reviewed By: Clement Foucault

1 files changed, 10 insertions, 0 deletions

diff --git a/source/blender/gpu/shaders/compositor/library/gpu_shader_compositor_texture_utilities.glsl b/source/blender/gpu/shaders/compositor/library/gpu_shader_compositor_texture_utilities.glsl
index 00e9a391097..128fc6aeaf5 100644
--- a/source/blender/gpu/shaders/compositor/library/gpu_shader_compositor_texture_utilities.glsl
+++ b/source/blender/gpu/shaders/compositor/library/gpu_shader_compositor_texture_utilities.glsl
@@ -23,3 +23,13 @@ vec4 texture_load(sampler2D sampler, ivec2 texel)
   const ivec2 texture_bounds = texture_size(sampler) - ivec2(1);
   return texelFetch(sampler, clamp(texel, ivec2(0), texture_bounds), 0);
 }
+
+/* A shorthand for 2D texelFetch with zero LOD and a fallback value for out-of-bound access. */
+vec4 texture_load(sampler2D sampler, ivec2 texel, vec4 fallback)
+{
+  const ivec2 texture_bounds = texture_size(sampler) - ivec2(1);
+  if (any(lessThan(texel, ivec2(0))) || any(greaterThan(texel, texture_bounds))) {
+    return fallback;
+  }
+  return texelFetch(sampler, texel, 0);
+}