1 files changed, 73 insertions, 0 deletions
diff --git a/source/blender/draw/engines/eevee/shaders/eevee_culling_tile_comp.glsl b/source/blender/draw/engines/eevee/shaders/eevee_culling_tile_comp.glsl
new file mode 100644
index 00000000000..913e094980e
--- /dev/null
+++ b/source/blender/draw/engines/eevee/shaders/eevee_culling_tile_comp.glsl
@@ -0,0 +1,73 @@
+
+/**
+ * 2D Culling pass for lights.
+ * We iterate over all items and check if they intersect with the tile frustum.
+ * Dispatch one thread per word.
+ */
+
+#pragma BLENDER_REQUIRE(common_view_lib.glsl)
+#pragma BLENDER_REQUIRE(common_math_geom_lib.glsl)
+#pragma BLENDER_REQUIRE(eevee_light_lib.glsl)
+#pragma BLENDER_REQUIRE(eevee_shader_shared.hh)
+#pragma BLENDER_REQUIRE(eevee_culling_lib.glsl)
+#pragma BLENDER_REQUIRE(eevee_culling_iter_lib.glsl)
+
+layout(local_size_x = 1024) in;
+
+layout(std430, binding = 0) readonly restrict buffer lights_buf
+{
+  LightData lights[];
+};
+
+layout(std430, binding = 1) readonly restrict buffer culling_buf
+{
+  CullingData culling;
+};
+
+layout(std430, binding = 2) writeonly restrict buffer culling_tile_buf
+{
+  CullingWord culling_words[];
+};
+
+void main(void)
+{
+  uint word_idx = gl_GlobalInvocationID.x % culling.tile_word_len;
+  uint tile_idx = gl_GlobalInvocationID.x / culling.tile_word_len;
+  uvec2 tile_co = uvec2(tile_idx % culling.tile_x_len, tile_idx / culling.tile_x_len);
+
+  if (tile_co.y >= culling.tile_y_len) {
+    return;
+  }
+
+  /* TODO(fclem): We could stop the tile at the HiZ depth. */
+  CullingTile tile = culling_tile_get(culling, tile_co);
+
+  uint l_idx = word_idx * 32u;
+  uint l_end = min(l_idx + 32u, culling.visible_count);
+  uint word = 0u;
+
+  for (; l_idx < l_end; l_idx++) {
+    LightData light = lights[l_idx];
+
+    bool intersect_tile;
+    switch (light.type) {
+      case LIGHT_SUN:
+        intersect_tile = true;
+        break;
+      case LIGHT_SPOT:
+        /* TODO cone culling. */
+      case LIGHT_RECT:
+      case LIGHT_ELLIPSE:
+      case LIGHT_POINT:
+        Sphere sphere = Sphere(light._position, light.influence_radius_max);
+        intersect_tile = culling_sphere_tile_isect(sphere, tile);
+        break;
+    }
+
+    if (intersect_tile) {
+      word |= 1u << (l_idx & 0x1Fu);
+    }
+  }
+
+  culling_words[gl_GlobalInvocationID.x] = word;
+}
+\ No newline at end of file