From 8ad335eae0038f68ec5d87e821ca6454b4cf46a2 Mon Sep 17 00:00:00 2001
From: Kaleb Reid <78945904+Kaleb-Reid@users.noreply.github.com>
Date: Tue, 26 Aug 2025 18:50:44 -0700
Subject: [PATCH] Divide screen texture by luminance multiplier in
 compatibility

---
 drivers/gles3/storage/material_storage.cpp |  1 +
 servers/rendering/shader_compiler.cpp      | 24 ++++++++++++++--------
 2 files changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/gles3/storage/material_storage.cpp b/drivers/gles3/storage/material_storage.cpp
index 87244fcc20c..4833641d1b4 100644
--- a/drivers/gles3/storage/material_storage.cpp
+++ b/drivers/gles3/storage/material_storage.cpp
@@ -1423,6 +1423,7 @@ MaterialStorage::MaterialStorage() {
 		actions.default_filter = ShaderLanguage::FILTER_LINEAR_MIPMAP;
 		actions.default_repeat = ShaderLanguage::REPEAT_ENABLE;
 
+		actions.apply_luminance_multiplier = true; // apply luminance multiplier to screen texture
 		actions.check_multiview_samplers = RasterizerGLES3::get_singleton()->is_xr_enabled();
 		actions.global_buffer_array_variable = "global_shader_uniforms";
 		actions.instance_uniform_index_variable = "instance_offset";
diff --git a/servers/rendering/shader_compiler.cpp b/servers/rendering/shader_compiler.cpp
index 6f49a8fe4ec..e367b26df23 100644
--- a/servers/rendering/shader_compiler.cpp
+++ b/servers/rendering/shader_compiler.cpp
@@ -1323,18 +1323,22 @@ String ShaderCompiler::_dump_node_code(const SL::Node *p_node, int p_level, Gene
 								}
 
 								code += data_type_name + "(" + node_code + ", " + sampler_name + ")";
-							} else if (actions.check_multiview_samplers && correct_texture_uniform && RS::get_singleton()->is_low_end()) {
+							} else if (correct_texture_uniform && RS::get_singleton()->is_low_end()) {
 								// Texture function on low end hardware (i.e. OpenGL).
-								// We just need to know if the texture supports multiview.
 
 								if (shader->uniforms.has(texture_uniform)) {
 									const ShaderLanguage::ShaderNode::Uniform &u = shader->uniforms[texture_uniform];
+									if (actions.check_multiview_samplers) {
+										if (u.hint == ShaderLanguage::ShaderNode::Uniform::HINT_SCREEN_TEXTURE) {
+											multiview_uv_needed = true;
+										} else if (u.hint == ShaderLanguage::ShaderNode::Uniform::HINT_DEPTH_TEXTURE) {
+											multiview_uv_needed = true;
+										} else if (u.hint == ShaderLanguage::ShaderNode::Uniform::HINT_NORMAL_ROUGHNESS_TEXTURE) {
+											multiview_uv_needed = true;
+										}
+									}
 									if (u.hint == ShaderLanguage::ShaderNode::Uniform::HINT_SCREEN_TEXTURE) {
-										multiview_uv_needed = true;
-									} else if (u.hint == ShaderLanguage::ShaderNode::Uniform::HINT_DEPTH_TEXTURE) {
-										multiview_uv_needed = true;
-									} else if (u.hint == ShaderLanguage::ShaderNode::Uniform::HINT_NORMAL_ROUGHNESS_TEXTURE) {
-										multiview_uv_needed = true;
+										is_screen_texture = true;
 									}
 								}
 
@@ -1353,7 +1357,11 @@ String ShaderCompiler::_dump_node_code(const SL::Node *p_node, int p_level, Gene
 					}
 					code += ")";
 					if (is_screen_texture && !texture_func_returns_data && actions.apply_luminance_multiplier) {
-						code = "(" + code + " * vec4(vec3(sc_luminance_multiplier()), 1.0))";
+						if (RS::get_singleton()->is_low_end()) {
+							code = "(" + code + " / vec4(vec3(scene_data_block.data.luminance_multiplier), 1.0))";
+						} else {
+							code = "(" + code + " * vec4(vec3(sc_luminance_multiplier()), 1.0))";
+						}
 					}
 					if (is_normal_roughness_texture && !texture_func_returns_data) {
 						code = "normal_roughness_compatibility(" + code + ")";