1 files changed, 35 insertions, 0 deletions
diff --git a/source/blender/compositor/realtime_compositor/shaders/library/gpu_shader_compositor_texture_utilities.glsl b/source/blender/compositor/realtime_compositor/shaders/library/gpu_shader_compositor_texture_utilities.glsl
new file mode 100644
index 00000000000..128fc6aeaf5
--- /dev/null
+++ b/source/blender/compositor/realtime_compositor/shaders/library/gpu_shader_compositor_texture_utilities.glsl
@@ -0,0 +1,35 @@
+/* A shorthand for 1D textureSize with a zero LOD. */
+int texture_size(sampler1D sampler)
+{
+  return textureSize(sampler, 0);
+}
+
+/* A shorthand for 1D texelFetch with zero LOD and bounded access clamped to border. */
+vec4 texture_load(sampler1D sampler, int x)
+{
+  const int texture_bound = texture_size(sampler) - 1;
+  return texelFetch(sampler, clamp(x, 0, texture_bound), 0);
+}
+
+/* A shorthand for 2D textureSize with a zero LOD. */
+ivec2 texture_size(sampler2D sampler)
+{
+  return textureSize(sampler, 0);
+}
+
+/* A shorthand for 2D texelFetch with zero LOD and bounded access clamped to border. */
+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);
+}