temp fix for ng ragebound stage 4-1 problem

src/video_core/engines/maxwell_3d.h

@@ -1,5 +1,5 @@
-// SPDX-FileCopyrightText: Copyright 2018 yuzu Emulator Project
-// SPDX-License-Identifier: GPL-2.0-or-later
+// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #pragma once
 
@@ -3131,6 +3131,31 @@ public:
     void ProcessCBData(u32 value);
     void ProcessCBMultiData(const u32* start_base, u32 amount);
 
+    //TEMP: skips problematic lighting blend detected in ninja gaiden ragebound
+    //TODO: fix blending properly. clue is FCSM_TR (src\shader_recompiler\frontend\ir\ir_emitter.cpp)
+    enum class UnimplementedBlendID : u32 {
+        NGR_00 = 0
+    };
+    inline static bool IsUnimplementedBlend(const Maxwell3D::Regs& _regs, UnimplementedBlendID id) {
+        using Blend = Maxwell3D::Regs::Blend;
+        bool result = true;
+        auto eq = [](u32 v, u32 a, u32 b) { return v == a || v == b; };
+        if (id == UnimplementedBlendID::NGR_00) {
+            result &= !_regs.blend_per_target_enabled;
+            result &= _regs.blend.enable[0];
+            result &= eq(static_cast<u32>(_regs.blend.color_source), static_cast<u32>(Blend::Factor::One_D3D), static_cast<u32>(Blend::Factor::One_GL));
+            result &= eq(static_cast<u32>(_regs.blend.color_dest), static_cast<u32>(Blend::Factor::Zero_D3D), static_cast<u32>(Blend::Factor::Zero_GL));
+            result &= eq(static_cast<u32>(_regs.blend.alpha_source), static_cast<u32>(Blend::Factor::One_D3D), static_cast<u32>(Blend::Factor::One_GL));
+            result &= eq(static_cast<u32>(_regs.blend.alpha_dest), static_cast<u32>(Blend::Factor::OneMinusSourceAlpha_D3D), static_cast<u32>(Blend::Factor::OneMinusSourceAlpha_GL));
+            result &= eq(static_cast<u32>(_regs.blend.color_op), static_cast<u32>(Blend::Equation::Add_D3D), static_cast<u32>(Blend::Equation::Add_GL));
+            result &= eq(static_cast<u32>(_regs.blend.alpha_op), static_cast<u32>(Blend::Equation::Add_D3D), static_cast<u32>(Blend::Equation::Add_GL));
+            result &= _regs.iterated_blend.enable;
+            result &= (_regs.iterated_blend.pass_count > 0);
+            return result;
+        }
+        return false;
+    }
+
 private:
     void InitializeRegisterDefaults();
 

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -1143,12 +1143,19 @@ void RasterizerOpenGL::SyncBlendState() {
             return;
         }
         glEnable(GL_BLEND);
+        //TEMP: skips problematic lighting blend detected in ninja gaiden ragebound
+        //TODO: fix blending properly. clue is FCSM_TR (src\shader_recompiler\frontend\ir\ir_emitter.cpp)
+        if (Tegra::Engines::Maxwell3D::IsUnimplementedBlend(regs, Tegra::Engines::Maxwell3D::UnimplementedBlendID::NGR_00)) {
+            glBlendFuncSeparate(GL_ONE, GL_ONE, GL_ONE_MINUS_SRC_COLOR, GL_ZERO);
+            glBlendEquationSeparate(GL_FUNC_ADD, GL_FUNC_ADD);
+        } else {
             glBlendFuncSeparate(MaxwellToGL::BlendFunc(regs.blend.color_source),
                                 MaxwellToGL::BlendFunc(regs.blend.color_dest),
                                 MaxwellToGL::BlendFunc(regs.blend.alpha_source),
                                 MaxwellToGL::BlendFunc(regs.blend.alpha_dest));
             glBlendEquationSeparate(MaxwellToGL::BlendEquation(regs.blend.color_op),
                                 MaxwellToGL::BlendEquation(regs.blend.alpha_op));
+        }
         return;
     }
 

src/video_core/renderer_vulkan/vk_rasterizer.cpp

@@ -1550,7 +1550,18 @@ void RasterizerVulkan::UpdateBlending(Tegra::Engines::Maxwell3D::Regs& regs) {
                 host_blend.alphaBlendOp = MaxwellToVK::BlendEquation(guest_blend.alpha_op);
             };
             if (!regs.blend_per_target_enabled) {
+                //TEMP: skips problematic lighting blend detected in ninja gaiden ragebound
+                //TODO: fix blending properly. clue is FCSM_TR (src\shader_recompiler\frontend\ir\ir_emitter.cpp)
+                if (Tegra::Engines::Maxwell3D::IsUnimplementedBlend(regs, Tegra::Engines::Maxwell3D::UnimplementedBlendID::NGR_00)) {
+                    setup_blends[index].srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
+                    setup_blends[index].dstColorBlendFactor = VK_BLEND_FACTOR_ONE;
+                    setup_blends[index].colorBlendOp = VK_BLEND_OP_ADD;
+                    setup_blends[index].srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_COLOR;
+                    setup_blends[index].dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
+                    setup_blends[index].alphaBlendOp = VK_BLEND_OP_ADD;
+                } else {
                     blend_setup(regs.blend);
+                }
                 continue;
             }
             blend_setup(regs.blend_per_target[index]);