Implement render_target_was_used API so that Viewports can properly check if they have been used.

For the RD renderer, this does not work for Viewports used in scene shaders yet

5 files changed, 36 insertions, 0 deletions

diff --git a/servers/rendering/renderer_rd/storage_rd/material_storage.cpp b/servers/rendering/renderer_rd/storage_rd/material_storage.cpp
index 23ee9c3842..709e4b449f 100644
--- a/servers/rendering/renderer_rd/storage_rd/material_storage.cpp
+++ b/servers/rendering/renderer_rd/storage_rd/material_storage.cpp
@@ -1319,6 +1319,10 @@ void MaterialStorage::MaterialData::update_textures(const HashMap<StringName, Va
 						roughness_detect_texture = tex;
 						roughness_channel = RS::TextureDetectRoughnessChannel(p_texture_uniforms[i].hint - ShaderLanguage::ShaderNode::Uniform::HINT_ROUGHNESS_R);
 					}
+					if (tex->render_target) {
+						tex->render_target->was_used = true;
+						render_target_cache.push_back(tex->render_target);
+					}
 #endif
 				}
 				if (rd_texture.is_null()) {
@@ -1405,6 +1409,7 @@ bool MaterialStorage::MaterialData::update_parameters_uniform_set(const HashMap<
 
 	if ((uint32_t)texture_cache.size() != tex_uniform_count || p_textures_dirty) {
 		texture_cache.resize(tex_uniform_count);
+		render_target_cache.clear();
 		p_textures_dirty = true;
 
 		//clear previous uniform set
@@ -1465,6 +1470,12 @@ bool MaterialStorage::MaterialData::update_parameters_uniform_set(const HashMap<
 	return true;
 }
 
+void MaterialStorage::MaterialData::set_as_used() {
+	for (int i = 0; i < render_target_cache.size(); i++) {
+		render_target_cache[i]->was_used = true;
+	}
+}
+
 ///////////////////////////////////////////////////////////////////////////
 // MaterialStorage
 
diff --git a/servers/rendering/renderer_rd/storage_rd/material_storage.h b/servers/rendering/renderer_rd/storage_rd/material_storage.h
index d7d8303a06..989a0f7b45 100644
--- a/servers/rendering/renderer_rd/storage_rd/material_storage.h
+++ b/servers/rendering/renderer_rd/storage_rd/material_storage.h
@@ -31,6 +31,8 @@
 #ifndef MATERIAL_STORAGE_RD_H
 #define MATERIAL_STORAGE_RD_H
 
+#include "texture_storage.h"
+
 #include "core/math/projection.h"
 #include "core/templates/local_vector.h"
 #include "core/templates/rid_owner.h"
@@ -74,8 +76,10 @@ public:
 	};
 
 	struct MaterialData {
+		Vector<RendererRD::TextureStorage::RenderTarget *> render_target_cache;
 		void update_uniform_buffer(const HashMap<StringName, ShaderLanguage::ShaderNode::Uniform> &p_uniforms, const uint32_t *p_uniform_offsets, const HashMap<StringName, Variant> &p_parameters, uint8_t *p_buffer, uint32_t p_buffer_size, bool p_use_linear_color);
 		void update_textures(const HashMap<StringName, Variant> &p_parameters, const HashMap<StringName, HashMap<int, RID>> &p_default_textures, const Vector<ShaderCompiler::GeneratedCode::Texture> &p_texture_uniforms, RID *p_textures, bool p_use_linear_color);
+		void set_as_used();
 
 		virtual void set_render_priority(int p_priority) = 0;
 		virtual void set_next_pass(RID p_pass) = 0;
diff --git a/servers/rendering/renderer_rd/storage_rd/particles_storage.cpp b/servers/rendering/renderer_rd/storage_rd/particles_storage.cpp
index 8b1ff0a72a..668e8bda0c 100644
--- a/servers/rendering/renderer_rd/storage_rd/particles_storage.cpp
+++ b/servers/rendering/renderer_rd/storage_rd/particles_storage.cpp
@@ -1107,6 +1107,7 @@ void ParticlesStorage::_particles_process(Particles *p_particles, double p_delta
 
 	if (m->uniform_set.is_valid() && RD::get_singleton()->uniform_set_is_valid(m->uniform_set)) {
 		RD::get_singleton()->compute_list_bind_uniform_set(compute_list, m->uniform_set, 3);
+		m->set_as_used();
 	}
 
 	RD::get_singleton()->compute_list_set_push_constant(compute_list, &push_constant, sizeof(ParticlesShader::PushConstant));
diff --git a/servers/rendering/renderer_rd/storage_rd/texture_storage.cpp b/servers/rendering/renderer_rd/storage_rd/texture_storage.cpp
index 543eb0cb72..92a0b6750b 100644
--- a/servers/rendering/renderer_rd/storage_rd/texture_storage.cpp
+++ b/servers/rendering/renderer_rd/storage_rd/texture_storage.cpp
@@ -581,6 +581,9 @@ bool TextureStorage::canvas_texture_get_uniform_set(RID p_texture, RS::CanvasIte
 		}
 
 		ct = t->canvas_texture;
+		if (t->render_target) {
+			t->render_target->was_used = true;
+		}
 	} else {
 		ct = canvas_texture_owner.get_or_null(p_texture);
 	}
@@ -611,6 +614,9 @@ bool TextureStorage::canvas_texture_get_uniform_set(RID p_texture, RS::CanvasIte
 			} else {
 				u.append_id(t->rd_texture);
 				ct->size_cache = Size2i(t->width_2d, t->height_2d);
+				if (t->render_target) {
+					t->render_target->was_used = true;
+				}
 			}
 			uniforms.push_back(u);
 		}
@@ -626,6 +632,9 @@ bool TextureStorage::canvas_texture_get_uniform_set(RID p_texture, RS::CanvasIte
 			} else {
 				u.append_id(t->rd_texture);
 				ct->use_normal_cache = true;
+				if (t->render_target) {
+					t->render_target->was_used = true;
+				}
 			}
 			uniforms.push_back(u);
 		}
@@ -641,6 +650,9 @@ bool TextureStorage::canvas_texture_get_uniform_set(RID p_texture, RS::CanvasIte
 			} else {
 				u.append_id(t->rd_texture);
 				ct->use_specular_cache = true;
+				if (t->render_target) {
+					t->render_target->was_used = true;
+				}
 			}
 			uniforms.push_back(u);
 		}
@@ -2398,6 +2410,10 @@ void TextureStorage::_clear_render_target(RenderTarget *rt) {
 
 	rt->color = RID();
 	rt->color_multisample = RID();
+	if (rt->texture.is_valid()) {
+		Texture *tex = get_texture(rt->texture);
+		tex->render_target = nullptr;
+	}
 }
 
 void TextureStorage::_update_render_target(RenderTarget *rt) {
@@ -2478,6 +2494,7 @@ void TextureStorage::_update_render_target(RenderTarget *rt) {
 
 		tex->rd_texture = RID();
 		tex->rd_texture_srgb = RID();
+		tex->render_target = rt;
 
 		//create shared textures to the color buffer,
 		//so transparent can be supported
diff --git a/servers/rendering/renderer_rd/storage_rd/texture_storage.h b/servers/rendering/renderer_rd/storage_rd/texture_storage.h
index f4737eb63d..0c70d3f938 100644
--- a/servers/rendering/renderer_rd/storage_rd/texture_storage.h
+++ b/servers/rendering/renderer_rd/storage_rd/texture_storage.h
@@ -108,6 +108,8 @@ private:
 
 	/* Texture API */
 
+	struct RenderTarget;
+
 	class Texture {
 	public:
 		TextureType type;
@@ -141,6 +143,7 @@ private:
 		Vector<BufferSlice3D> buffer_slices_3d;
 		uint32_t buffer_size_3d = 0;
 
+		RenderTarget *render_target = nullptr;
 		bool is_render_target;
 		bool is_proxy;