NG ragebound workaround via LoadOverrides + vk_rasterizer UpdateBlending TouchBlendequations Rework

Added kleidis and crueter instructions
added in vk's fixed_pipeline_state Refresh() to cover EDS=0 case

src/common/settings.cpp

@@ -359,6 +359,9 @@ void RestoreGlobalState(bool is_powered_on) {
     for (const auto& reset : values.linkage.restore_functions) {
         reset();
     }
+
+    // Reset per-game flags
+    values.use_squashed_iterated_blend = false;
 }
 
 static bool configuring_global = true;

src/common/settings.h

@@ -759,6 +759,9 @@ struct Values {
 
     // Add-Ons
     std::map<u64, std::vector<std::string>> disabled_addons;
+
+    // Per-game overrides
+    bool use_squashed_iterated_blend;
 };
 
 extern Values values;

src/core/core.cpp

@@ -297,6 +297,9 @@ struct System::Impl {
         std::string vendor = gpu_core->Renderer().GetDeviceVendor();
         LOG_INFO(Core, "GPU Vendor: {}", vendor);
 
+        // Reset all per-game flags
+        Settings::values.use_squashed_iterated_blend = false;
+
         // Insert PC overrides here
 
     #ifdef ANDROID
@@ -322,6 +325,13 @@ struct System::Impl {
 
     #endif
 
+        // Ninja Gaiden Ragebound
+        constexpr u64 ngr = 0x0100781020710000ULL;
+
+        if (programId == ngr) {
+            LOG_INFO(Core, "Enabling game specifc override: use_squashed_iterated_blend");
+            Settings::values.use_squashed_iterated_blend = true;
+        }
     }
 
     SystemResultStatus Load(System& system, Frontend::EmuWindow& emu_window,
@@ -425,6 +435,9 @@ struct System::Impl {
     void ShutdownMainProcess() {
         SetShuttingDown(true);
 
+        // Reset per-game flags
+        Settings::values.use_squashed_iterated_blend = false;
+
         is_powered_on = false;
         exit_locked = false;
         exit_requested = false;

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -1142,6 +1142,14 @@ void RasterizerOpenGL::SyncBlendState() {
             glDisable(GL_BLEND);
             return;
         }
+        // Temporary workaround for games that use iterated blending
+        if (regs.iterated_blend.enable && Settings::values.use_squashed_iterated_blend) {
+            glEnable(GL_BLEND);
+            glBlendFuncSeparate(GL_ONE, GL_ONE, GL_ONE_MINUS_SRC_COLOR, GL_ZERO);
+            glBlendEquationSeparate(GL_FUNC_ADD, GL_FUNC_ADD);
+            return;
+        }
+
         glEnable(GL_BLEND);
         glBlendFuncSeparate(MaxwellToGL::BlendFunc(regs.blend.color_source),
                             MaxwellToGL::BlendFunc(regs.blend.color_dest),

src/video_core/renderer_vulkan/fixed_pipeline_state.cpp

@@ -11,6 +11,7 @@
 #include <ranges>
 #include "common/cityhash.h"
 #include "common/common_types.h"
+#include "common/settings.h"
 #include "video_core/engines/draw_manager.h"
 #include "video_core/renderer_vulkan/fixed_pipeline_state.h"
 #include "video_core/renderer_vulkan/vk_state_tracker.h"
@@ -201,6 +202,19 @@ void FixedPipelineState::BlendingAttachment::Refresh(const Maxwell& regs, size_t
     };
 
     if (!regs.blend_per_target_enabled) {
+        // Temporary workaround for games that use iterated blending
+        // even when dynamic blending is off so overrides work with EDS = 0 as well
+        if (regs.iterated_blend.enable && Settings::values.use_squashed_iterated_blend) {
+            equation_rgb.Assign(PackBlendEquation(Maxwell::Blend::Equation::Add_GL));
+            equation_a.Assign(PackBlendEquation(Maxwell::Blend::Equation::Add_GL));
+            factor_source_rgb.Assign(PackBlendFactor(Maxwell::Blend::Factor::One_GL));
+            factor_dest_rgb.Assign(PackBlendFactor(Maxwell::Blend::Factor::One_GL));
+            factor_source_a.Assign(
+                PackBlendFactor(Maxwell::Blend::Factor::OneMinusSourceColor_GL));
+            factor_dest_a.Assign(PackBlendFactor(Maxwell::Blend::Factor::Zero_GL));
+            enable.Assign(1);
+            return;
+        }
         setup_blend(regs.blend);
         return;
     }

src/video_core/renderer_vulkan/vk_rasterizer.cpp

@@ -1557,9 +1557,8 @@ void RasterizerVulkan::UpdateBlending(Tegra::Engines::Maxwell3D::Regs& regs) {
 
     if (state_tracker.TouchBlendEquations()) {
         std::array<VkColorBlendEquationEXT, Maxwell::NumRenderTargets> setup_blends{};
-        for (size_t index = 0; index < Maxwell::NumRenderTargets; index++) {
-            const auto blend_setup = [&]<typename T>(const T& guest_blend) {
-                auto& host_blend = setup_blends[index];
+
+        const auto blend_setup = [&](auto& host_blend, const auto& guest_blend) {
             host_blend.srcColorBlendFactor = MaxwellToVK::BlendFactor(guest_blend.color_source);
             host_blend.dstColorBlendFactor = MaxwellToVK::BlendFactor(guest_blend.color_dest);
             host_blend.colorBlendOp = MaxwellToVK::BlendEquation(guest_blend.color_op);
@@ -1567,12 +1566,32 @@ void RasterizerVulkan::UpdateBlending(Tegra::Engines::Maxwell3D::Regs& regs) {
             host_blend.dstAlphaBlendFactor = MaxwellToVK::BlendFactor(guest_blend.alpha_dest);
             host_blend.alphaBlendOp = MaxwellToVK::BlendEquation(guest_blend.alpha_op);
         };
+
+        // Single blend equation for all targets
         if (!regs.blend_per_target_enabled) {
-                blend_setup(regs.blend);
-                continue;
+            // Temporary workaround for games that use iterated blending
+            if (regs.iterated_blend.enable && Settings::values.use_squashed_iterated_blend) {
+                setup_blends[0].srcColorBlendFactor = VK_BLEND_FACTOR_ONE;
+                setup_blends[0].dstColorBlendFactor = VK_BLEND_FACTOR_ONE;
+                setup_blends[0].colorBlendOp = VK_BLEND_OP_ADD;
+                setup_blends[0].srcAlphaBlendFactor = VK_BLEND_FACTOR_ONE_MINUS_SRC_COLOR;
+                setup_blends[0].dstAlphaBlendFactor = VK_BLEND_FACTOR_ZERO;
+                setup_blends[0].alphaBlendOp = VK_BLEND_OP_ADD;
+            } else {
+                blend_setup(setup_blends[0], regs.blend);
             }
-            blend_setup(regs.blend_per_target[index]);
+
+            // Copy first blend state to all other targets
+            for (size_t index = 1; index < Maxwell::NumRenderTargets; index++) {
+                setup_blends[index] = setup_blends[0];
             }
+        } else {
+            // Per-target blending
+            for (size_t index = 0; index < Maxwell::NumRenderTargets; index++) {
+                blend_setup(setup_blends[index], regs.blend_per_target[index]);
+            }
+        }
+
         scheduler.Record([setup_blends](vk::CommandBuffer cmdbuf) {
             cmdbuf.SetColorBlendEquationEXT(0, setup_blends);
         });