EEVEE: Light: Port light culling to GPU

This removes the light count limit for the forward shaded object. This
also provides a more efficient way of computing the culling directly on
the GPU. Moreover, this avoids doing multiple lighting passes for high
light counts in the deferred pipeline, improving performance.

1 files changed, 4 insertions, 3 deletions

diff --git a/source/blender/draw/engines/eevee/shaders/eevee_light_eval_lib.glsl b/source/blender/draw/engines/eevee/shaders/eevee_light_eval_lib.glsl
index 448e5b54886..d3d5f859174 100644
--- a/source/blender/draw/engines/eevee/shaders/eevee_light_eval_lib.glsl
+++ b/source/blender/draw/engines/eevee/shaders/eevee_light_eval_lib.glsl
@@ -4,9 +4,10 @@
  * A prototype needs to be declared before main in order to use it.
  *
  * The resources expected to be defined are:
- * - light_culling
- * - lights_culling_tx
  * - lights
+ * - lights_zbins
+ * - light_culling
+ * - lights_culling_words
  * - shadows
  * - shadow_atlas_tx
  * - shadow_tilemaps_tx
@@ -33,7 +34,7 @@ void light_eval(ClosureDiffuse diffuse,
   vec4 ltc_mat = utility_tx_sample(uv, UTIL_LTC_MAT_LAYER);
   float ltc_mag = utility_tx_sample(uv, UTIL_LTC_MAG_LAYER).x;
 
-  ITEM_FOREACH_BEGIN (light_culling, lights_culling_tx, vP_z, l_idx) {
+  ITEM_FOREACH_BEGIN (light_culling, lights_zbins, lights_culling_words, vP_z, l_idx) {
     LightData light = lights[l_idx];
     vec3 L;
     float dist;