DRW-Next: Add uniform attributes (object attributes) support

This replaces the direct shader uniform layout declaration by a linear
search through a global buffer.

Each instance has an attribute offset inside the global buffer and an
attribute count.

This removes any padding and tighly pack all uniform attributes inside
a single buffer.

This would also remove the limit of 8 attribute but it is kept because of
compatibility with the old system that is still used by the old draw
manager.

2 files changed, 10 insertions, 1 deletions

diff --git a/source/blender/draw/intern/shaders/common_attribute_lib.glsl b/source/blender/draw/intern/shaders/common_attribute_lib.glsl
index ce5e49c7f63..6b5b6fcc846 100644
--- a/source/blender/draw/intern/shaders/common_attribute_lib.glsl
+++ b/source/blender/draw/intern/shaders/common_attribute_lib.glsl
@@ -25,3 +25,4 @@ float attr_load_float(sampler3D tex);
 
 float attr_load_temperature_post(float attr);
 vec4 attr_load_color_post(vec4 attr);
+vec4 attr_load_uniform(vec4 attr, const uint attr_hash);
diff --git a/source/blender/draw/intern/shaders/draw_object_infos_info.hh b/source/blender/draw/intern/shaders/draw_object_infos_info.hh
index 2ec40ab76e3..31fee018fbc 100644
--- a/source/blender/draw/intern/shaders/draw_object_infos_info.hh
+++ b/source/blender/draw/intern/shaders/draw_object_infos_info.hh
@@ -25,4 +25,12 @@ GPU_SHADER_CREATE_INFO(draw_object_infos_new)
     .define("OrcoTexCoFactors", "(drw_infos[resource_id].orco_mul_bias)")
     .define("ObjectInfo", "(drw_infos[resource_id].infos)")
     .define("ObjectColor", "(drw_infos[resource_id].color)")
-    .storage_buf(DRW_OBJ_INFOS_SLOT, Qualifier::READ, "ObjectInfos", "drw_infos[]");
\ No newline at end of file
+    .storage_buf(DRW_OBJ_INFOS_SLOT, Qualifier::READ, "ObjectInfos", "drw_infos[]");
+
+/** \note Requires draw_object_infos_new. */
+GPU_SHADER_CREATE_INFO(draw_object_attribute_new)
+    .define("OBATTR_LIB")
+    .define("ObjectAttributeStart", "(drw_infos[resource_id].orco_mul_bias[0].w)")
+    .define("ObjectAttributeLen", "(drw_infos[resource_id].orco_mul_bias[1].w)")
+    .storage_buf(DRW_OBJ_ATTR_SLOT, Qualifier::READ, "ObjectAttribute", "drw_attrs[]")
+    .additional_info("draw_object_infos_new");