video_core: Generate mipmap texture by drawing

src/shader_recompiler/CMakeLists.txt

@@ -224,6 +224,7 @@ add_library(shader_recompiler STATIC
     ir_opt/lower_fp16_to_fp32.cpp
     ir_opt/lower_int64_to_int32.cpp
     ir_opt/passes.h
+    ir_opt/position_pass.cpp
     ir_opt/rescaling_pass.cpp
     ir_opt/ssa_rewrite_pass.cpp
     ir_opt/texture_pass.cpp

src/shader_recompiler/backend/glasm/emit_glasm.cpp

@@ -450,6 +450,9 @@ std::string EmitGLASM(const Profile& profile, const RuntimeInfo& runtime_info, I
     if (program.info.uses_rescaling_uniform) {
         header += "PARAM scaling[1]={program.local[0..0]};";
     }
+    if (program.info.uses_render_area) {
+        header += "PARAM render_area[1]={program.local[1..1]};";
+    }
     header += "TEMP ";
     for (size_t index = 0; index < ctx.reg_alloc.NumUsedRegisters(); ++index) {
         header += fmt::format("R{},", index);

src/shader_recompiler/backend/glasm/emit_glasm_context_get_set.cpp

@@ -379,6 +379,10 @@ void EmitResolutionDownFactor(EmitContext& ctx, IR::Inst& inst) {
     ctx.Add("MOV.F {}.x,scaling[0].z;", inst);
 }
 
+void EmitRenderArea(EmitContext& ctx, IR::Inst& inst) {
+    ctx.Add("MOV.F {},render_area[0];", inst);
+}
+
 void EmitLoadLocal(EmitContext& ctx, IR::Inst& inst, ScalarU32 word_offset) {
     ctx.Add("MOV.U {},lmem[{}].x;", inst, word_offset);
 }

src/shader_recompiler/backend/glasm/emit_glasm_instructions.h

@@ -73,6 +73,7 @@ void EmitSampleId(EmitContext& ctx, IR::Inst& inst);
 void EmitIsHelperInvocation(EmitContext& ctx, IR::Inst& inst);
 void EmitYDirection(EmitContext& ctx, IR::Inst& inst);
 void EmitResolutionDownFactor(EmitContext& ctx, IR::Inst& inst);
+void EmitRenderArea(EmitContext& ctx, IR::Inst& inst);
 void EmitLoadLocal(EmitContext& ctx, IR::Inst& inst, ScalarU32 word_offset);
 void EmitWriteLocal(EmitContext& ctx, ScalarU32 word_offset, ScalarU32 value);
 void EmitUndefU1(EmitContext& ctx, IR::Inst& inst);

src/shader_recompiler/backend/glsl/emit_glsl_context_get_set.cpp

@@ -416,6 +416,10 @@ void EmitResolutionDownFactor(EmitContext& ctx, IR::Inst& inst) {
     ctx.AddF32("{}=scaling.z;", inst);
 }
 
+void EmitRenderArea(EmitContext& ctx, IR::Inst& inst) {
+    ctx.AddF32x4("{}=render_area;", inst);
+}
+
 void EmitLoadLocal(EmitContext& ctx, IR::Inst& inst, std::string_view word_offset) {
     ctx.AddU32("{}=lmem[{}];", inst, word_offset);
 }

src/shader_recompiler/backend/glsl/emit_glsl_instructions.h

@@ -87,6 +87,7 @@ void EmitSampleId(EmitContext& ctx, IR::Inst& inst);
 void EmitIsHelperInvocation(EmitContext& ctx, IR::Inst& inst);
 void EmitYDirection(EmitContext& ctx, IR::Inst& inst);
 void EmitResolutionDownFactor(EmitContext& ctx, IR::Inst& inst);
+void EmitRenderArea(EmitContext& ctx, IR::Inst& inst);
 void EmitLoadLocal(EmitContext& ctx, IR::Inst& inst, std::string_view word_offset);
 void EmitWriteLocal(EmitContext& ctx, std::string_view word_offset, std::string_view value);
 void EmitUndefU1(EmitContext& ctx, IR::Inst& inst);

src/shader_recompiler/backend/glsl/glsl_emit_context.cpp

@@ -358,6 +358,9 @@ EmitContext::EmitContext(IR::Program& program, Bindings& bindings, const Profile
     if (info.uses_rescaling_uniform) {
         header += "layout(location=0) uniform vec4 scaling;";
     }
+    if (info.uses_render_area) {
+        header += "layout(location=1) uniform vec4 render_area;";
+    }
     DefineConstantBuffers(bindings);
     DefineConstantBufferIndirect();
     DefineStorageBuffers(bindings);

src/shader_recompiler/backend/spirv/emit_spirv.h

@@ -23,8 +23,12 @@ struct RescalingLayout {
     alignas(16) std::array<u32, NUM_IMAGE_SCALING_WORDS> rescaling_images;
     u32 down_factor;
 };
+struct RenderAreaLayout {
+    std::array<f32, 4> render_area;
+};
 constexpr u32 RESCALING_LAYOUT_WORDS_OFFSET = offsetof(RescalingLayout, rescaling_textures);
 constexpr u32 RESCALING_LAYOUT_DOWN_FACTOR_OFFSET = offsetof(RescalingLayout, down_factor);
+constexpr u32 RENDERAREA_LAYOUT_OFFSET = offsetof(RenderAreaLayout, render_area);
 
 [[nodiscard]] std::vector<u32> EmitSPIRV(const Profile& profile, const RuntimeInfo& runtime_info,
                                          IR::Program& program, Bindings& bindings);

src/shader_recompiler/backend/spirv/emit_spirv_context_get_set.cpp

@@ -353,7 +353,6 @@ Id EmitGetAttribute(EmitContext& ctx, IR::Attribute attr, Id vertex) {
     case IR::Attribute::TessellationEvaluationPointV:
         return ctx.OpLoad(ctx.F32[1],
                           ctx.OpAccessChain(ctx.input_f32, ctx.tess_coord, ctx.Const(1U)));
-
     default:
         throw NotImplementedException("Read attribute {}", attr);
     }
@@ -537,6 +536,17 @@ Id EmitResolutionDownFactor(EmitContext& ctx) {
     }
 }
 
+Id EmitRenderArea(EmitContext& ctx) {
+    if (ctx.profile.unified_descriptor_binding) {
+        const Id pointer_type{ctx.TypePointer(spv::StorageClass::PushConstant, ctx.F32[4])};
+        const Id index{ctx.Const(ctx.render_are_member_index)};
+        const Id pointer{ctx.OpAccessChain(pointer_type, ctx.render_area_push_constant, index)};
+        return ctx.OpLoad(ctx.F32[4], pointer);
+    } else {
+        throw NotImplementedException("SPIR-V Instruction");
+    }
+}
+
 Id EmitLoadLocal(EmitContext& ctx, Id word_offset) {
     const Id pointer{ctx.OpAccessChain(ctx.private_u32, ctx.local_memory, word_offset)};
     return ctx.OpLoad(ctx.U32[1], pointer);

src/shader_recompiler/backend/spirv/emit_spirv_instructions.h

@@ -76,6 +76,7 @@ Id EmitSampleId(EmitContext& ctx);
 Id EmitIsHelperInvocation(EmitContext& ctx);
 Id EmitYDirection(EmitContext& ctx);
 Id EmitResolutionDownFactor(EmitContext& ctx);
+Id EmitRenderArea(EmitContext& ctx);
 Id EmitLoadLocal(EmitContext& ctx, Id word_offset);
 void EmitWriteLocal(EmitContext& ctx, Id word_offset, Id value);
 Id EmitUndefU1(EmitContext& ctx);

src/shader_recompiler/backend/spirv/spirv_emit_context.cpp

@@ -473,6 +473,7 @@ EmitContext::EmitContext(const Profile& profile_, const RuntimeInfo& runtime_inf
     DefineAttributeMemAccess(program.info);
     DefineGlobalMemoryFunctions(program.info);
     DefineRescalingInput(program.info);
+    DefineRenderArea(program.info);
 }
 
 EmitContext::~EmitContext() = default;
@@ -982,6 +983,36 @@ void EmitContext::DefineRescalingInputUniformConstant() {
     }
 }
 
+void EmitContext::DefineRenderArea(const Info& info) {
+    if (!info.uses_render_area) {
+        return;
+    }
+
+    if (profile.unified_descriptor_binding) {
+        boost::container::static_vector<Id, 1> members{};
+        u32 member_index{0};
+
+        members.push_back(F32[4]);
+        render_are_member_index = member_index++;
+
+        const Id push_constant_struct{TypeStruct(std::span(members.data(), members.size()))};
+        Decorate(push_constant_struct, spv::Decoration::Block);
+        Name(push_constant_struct, "RenderAreaInfo");
+
+        MemberDecorate(push_constant_struct, render_are_member_index, spv::Decoration::Offset, 0);
+        MemberName(push_constant_struct, render_are_member_index, "render_area");
+
+        const Id pointer_type{TypePointer(spv::StorageClass::PushConstant, push_constant_struct)};
+        render_area_push_constant =
+            AddGlobalVariable(pointer_type, spv::StorageClass::PushConstant);
+        Name(render_area_push_constant, "render_area_push_constants");
+
+        if (profile.supported_spirv >= 0x00010400) {
+            interfaces.push_back(render_area_push_constant);
+        }
+    }
+}
+
 void EmitContext::DefineConstantBuffers(const Info& info, u32& binding) {
     if (info.constant_buffer_descriptors.empty()) {
         return;

src/shader_recompiler/backend/spirv/spirv_emit_context.h

@@ -243,6 +243,9 @@ public:
     u32 texture_rescaling_index{};
     u32 image_rescaling_index{};
 
+    Id render_area_push_constant{};
+    u32 render_are_member_index{};
+
     Id local_memory{};
 
     Id shared_memory_u8{};
@@ -318,6 +321,7 @@ private:
     void DefineRescalingInput(const Info& info);
     void DefineRescalingInputPushConstant();
     void DefineRescalingInputUniformConstant();
+    void DefineRenderArea(const Info& info);
 
     void DefineInputs(const IR::Program& program);
     void DefineOutputs(const IR::Program& program);

src/shader_recompiler/environment.h

@@ -22,6 +22,8 @@ public:
 
     [[nodiscard]] virtual TextureType ReadTextureType(u32 raw_handle) = 0;
 
+    [[nodiscard]] virtual u32 ReadViewportTransformState() = 0;
+
     [[nodiscard]] virtual u32 TextureBoundBuffer() const = 0;
 
     [[nodiscard]] virtual u32 LocalMemorySize() const = 0;

src/shader_recompiler/frontend/ir/ir_emitter.cpp

@@ -378,6 +378,14 @@ F32 IREmitter::ResolutionDownFactor() {
     return Inst<F32>(Opcode::ResolutionDownFactor);
 }
 
+F32 IREmitter::RenderAreaWidth() {
+    return F32(CompositeExtract(Inst<Value>(Opcode::RenderArea), 0));
+}
+
+F32 IREmitter::RenderAreaHeight() {
+    return F32(CompositeExtract(Inst<Value>(Opcode::RenderArea), 1));
+}
+
 U32 IREmitter::LaneId() {
     return Inst<U32>(Opcode::LaneId);
 }

src/shader_recompiler/frontend/ir/ir_emitter.h

@@ -103,6 +103,9 @@ public:
 
     [[nodiscard]] F32 ResolutionDownFactor();
 
+    [[nodiscard]] F32 RenderAreaWidth();
+    [[nodiscard]] F32 RenderAreaHeight();
+
     [[nodiscard]] U32 LaneId();
 
     [[nodiscard]] U32 LoadGlobalU8(const U64& address);

src/shader_recompiler/frontend/ir/opcodes.inc

@@ -63,6 +63,7 @@ OPCODE(SampleId,                                            U32,
 OPCODE(IsHelperInvocation,                                  U1,                                                                                             )
 OPCODE(YDirection,                                          F32,                                                                                            )
 OPCODE(ResolutionDownFactor,                                F32,                                                                                            )
+OPCODE(RenderArea,                                          F32x4,                                                                                          )
 
 // Undefined
 OPCODE(UndefU1,                                             U1,                                                                                             )

src/shader_recompiler/frontend/maxwell/translate_program.cpp

@@ -213,6 +213,8 @@ IR::Program TranslateProgram(ObjectPool<IR::Inst>& inst_pool, ObjectPool<IR::Blo
 
     Optimization::ConstantPropagationPass(program);
 
+    Optimization::PositionPass(env, program);
+
     Optimization::GlobalMemoryToStorageBufferPass(program);
     Optimization::TexturePass(env, program);
 

src/shader_recompiler/ir_opt/passes.h

@@ -17,6 +17,7 @@ void LowerFp16ToFp32(IR::Program& program);
 void LowerInt64ToInt32(IR::Program& program);
 void RescalingPass(IR::Program& program);
 void SsaRewritePass(IR::Program& program);
+void PositionPass(Environment& env, IR::Program& program);
 void TexturePass(Environment& env, IR::Program& program);
 void VerificationPass(const IR::Program& program);
 

src/shader_recompiler/ir_opt/position_pass.cpp

@@ -0,0 +1,77 @@
+// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include <boost/container/small_vector.hpp>
+
+#include "shader_recompiler/frontend/ir/basic_block.h"
+#include "shader_recompiler/frontend/ir/ir_emitter.h"
+#include "shader_recompiler/frontend/ir/value.h"
+#include "shader_recompiler/ir_opt/passes.h"
+
+namespace Shader::Optimization {
+
+namespace {
+struct PositionInst {
+    IR::Inst* inst;
+    IR::Block* block;
+    IR::Attribute attr;
+};
+using PositionInstVector = boost::container::small_vector<PositionInst, 24>;
+} // Anonymous namespace
+
+void PositionPass(Environment& env, IR::Program& program) {
+    if (env.ShaderStage() != Stage::VertexB || env.ReadViewportTransformState()) {
+        return;
+    }
+
+    Info& info{program.info};
+    info.uses_render_area = true;
+
+    PositionInstVector to_replace;
+    for (IR::Block* const block : program.post_order_blocks) {
+        for (IR::Inst& inst : block->Instructions()) {
+            switch (inst.GetOpcode()) {
+            case IR::Opcode::SetAttribute: {
+                const IR::Attribute attr{inst.Arg(0).Attribute()};
+                switch (attr) {
+                case IR::Attribute::PositionX:
+                case IR::Attribute::PositionY: {
+                    to_replace.push_back(PositionInst{.inst = &inst, .block = block, .attr = attr});
+                    break;
+                }
+                default:
+                    break;
+                }
+                break;
+            }
+            default:
+                break;
+            }
+        }
+    }
+
+    for (PositionInst& position_inst : to_replace) {
+        IR::IREmitter ir{*position_inst.block,
+                         IR::Block::InstructionList::s_iterator_to(*position_inst.inst)};
+        const IR::F32 value(position_inst.inst->Arg(1));
+        const IR::F32F64 scale(ir.Imm32(2.f));
+        const IR::F32 negative_one{ir.Imm32(-1.f)};
+        switch (position_inst.attr) {
+        case IR::Attribute::PositionX: {
+            position_inst.inst->SetArg(
+                1,
+                ir.FPFma(value, ir.FPMul(ir.FPRecip(ir.RenderAreaWidth()), scale), negative_one));
+            break;
+        }
+        case IR::Attribute::PositionY: {
+            position_inst.inst->SetArg(
+                1,
+                ir.FPFma(value, ir.FPMul(ir.FPRecip(ir.RenderAreaHeight()), scale), negative_one));
+            break;
+        }
+        default:
+            break;
+        }
+    }
+}
+} // namespace Shader::Optimization

src/shader_recompiler/shader_info.h

@@ -175,6 +175,7 @@ struct Info {
     bool uses_shadow_lod{};
     bool uses_rescaling_uniform{};
     bool uses_cbuf_indirect{};
+    bool uses_render_area{};
 
     IR::Type used_constant_buffer_types{};
     IR::Type used_storage_buffer_types{};

src/video_core/renderer_opengl/gl_graphics_pipeline.cpp

@@ -502,6 +502,17 @@ void GraphicsPipeline::ConfigureImpl(bool is_indexed) {
                                    float_image_scaling_mask, down_factor, 0.0f);
             }
         }
+        if (info.uses_render_area) {
+            const auto render_area_width(static_cast<GLfloat>(regs.render_area.width));
+            const auto render_area_height(static_cast<GLfloat>(regs.render_area.height));
+            if (use_assembly) {
+                glProgramLocalParameter4fARB(AssemblyStage(stage), 1, render_area_width,
+                                             render_area_height, 0.0f, 0.0f);
+            } else {
+                glProgramUniform4f(source_programs[stage].handle, 1, render_area_width,
+                                   render_area_height, 0.0f, 0.0f);
+            }
+        }
     }};
     if constexpr (Spec::enabled_stages[0]) {
         prepare_stage(0);

src/video_core/renderer_opengl/gl_rasterizer.cpp

@@ -622,6 +622,16 @@ void RasterizerOpenGL::SyncViewport() {
             }
             flags[Dirty::Viewport0 + index] = false;
 
+            if (!regs.viewport_transform_enabled) {
+                const auto x = static_cast<GLfloat>(regs.render_area.x);
+                const auto y = static_cast<GLfloat>(regs.render_area.y);
+                const auto width = static_cast<GLfloat>(regs.render_area.width);
+                const auto height = static_cast<GLfloat>(regs.render_area.height);
+                glViewportIndexedf(static_cast<GLuint>(index), x, y, width != 0.0f ? width : 1.0f,
+                                   height != 0.0f ? height : 1.0f);
+                continue;
+            }
+
             const auto& src = regs.viewport_transform[index];
             GLfloat x = conv(src.translate_x - src.scale_x);
             GLfloat y = conv(src.translate_y - src.scale_y);

src/video_core/renderer_opengl/gl_shader_cache.cpp

@@ -49,7 +49,7 @@ using VideoCommon::LoadPipelines;
 using VideoCommon::SerializePipeline;
 using Context = ShaderContext::Context;
 
-constexpr u32 CACHE_VERSION = 5;
+constexpr u32 CACHE_VERSION = 7;
 
 template <typename Container>
 auto MakeSpan(Container& container) {

src/video_core/renderer_vulkan/pipeline_helper.h

@@ -68,13 +68,15 @@ public:
     }
 
     vk::PipelineLayout CreatePipelineLayout(VkDescriptorSetLayout descriptor_set_layout) const {
+        using Shader::Backend::SPIRV::RenderAreaLayout;
         using Shader::Backend::SPIRV::RescalingLayout;
         const u32 size_offset = is_compute ? sizeof(RescalingLayout::down_factor) : 0u;
         const VkPushConstantRange range{
             .stageFlags = static_cast<VkShaderStageFlags>(
                 is_compute ? VK_SHADER_STAGE_COMPUTE_BIT : VK_SHADER_STAGE_ALL_GRAPHICS),
             .offset = 0,
-            .size = static_cast<u32>(sizeof(RescalingLayout)) - size_offset,
+            .size = static_cast<u32>(sizeof(RescalingLayout)) - size_offset +
+                    static_cast<u32>(sizeof(RenderAreaLayout)),
         };
         return device->GetLogical().CreatePipelineLayout({
             .sType = VK_STRUCTURE_TYPE_PIPELINE_LAYOUT_CREATE_INFO,
@@ -167,6 +169,12 @@ private:
     u32 image_bit{1u};
 };
 
+class RenderAreaPushConstant {
+public:
+    bool uses_render_area{};
+    std::array<f32, 4> words{};
+};
+
 inline void PushImageDescriptors(TextureCache& texture_cache,
                                  UpdateDescriptorQueue& update_descriptor_queue,
                                  const Shader::Info& info, RescalingPushConstant& rescaling,

src/video_core/renderer_vulkan/vk_graphics_pipeline.cpp

@@ -31,6 +31,7 @@ namespace {
 using boost::container::small_vector;
 using boost::container::static_vector;
 using Shader::ImageBufferDescriptor;
+using Shader::Backend::SPIRV::RENDERAREA_LAYOUT_OFFSET;
 using Shader::Backend::SPIRV::RESCALING_LAYOUT_DOWN_FACTOR_OFFSET;
 using Shader::Backend::SPIRV::RESCALING_LAYOUT_WORDS_OFFSET;
 using Tegra::Texture::TexturePair;
@@ -433,12 +434,19 @@ void GraphicsPipeline::ConfigureImpl(bool is_indexed) {
     update_descriptor_queue.Acquire();
 
     RescalingPushConstant rescaling;
+    RenderAreaPushConstant render_area;
     const VkSampler* samplers_it{samplers.data()};
     const VideoCommon::ImageViewInOut* views_it{views.data()};
     const auto prepare_stage{[&](size_t stage) LAMBDA_FORCEINLINE {
         buffer_cache.BindHostStageBuffers(stage);
         PushImageDescriptors(texture_cache, update_descriptor_queue, stage_infos[stage], rescaling,
                              samplers_it, views_it);
+        const auto& info{stage_infos[0]};
+        if (info.uses_render_area) {
+            render_area.uses_render_area = true;
+            render_area.words = {static_cast<float>(regs.render_area.width),
+                                 static_cast<float>(regs.render_area.height)};
+        }
     }};
     if constexpr (Spec::enabled_stages[0]) {
         prepare_stage(0);
@@ -455,10 +463,11 @@ void GraphicsPipeline::ConfigureImpl(bool is_indexed) {
     if constexpr (Spec::enabled_stages[4]) {
         prepare_stage(4);
     }
-    ConfigureDraw(rescaling);
+    ConfigureDraw(rescaling, render_area);
 }
 
-void GraphicsPipeline::ConfigureDraw(const RescalingPushConstant& rescaling) {
+void GraphicsPipeline::ConfigureDraw(const RescalingPushConstant& rescaling,
+                                     const RenderAreaPushConstant& render_are) {
     texture_cache.UpdateRenderTargets(false);
     scheduler.RequestRenderpass(texture_cache.GetFramebuffer());
 
@@ -474,7 +483,9 @@ void GraphicsPipeline::ConfigureDraw(const RescalingPushConstant& rescaling) {
     const bool bind_pipeline{scheduler.UpdateGraphicsPipeline(this)};
     const void* const descriptor_data{update_descriptor_queue.UpdateData()};
     scheduler.Record([this, descriptor_data, bind_pipeline, rescaling_data = rescaling.Data(),
-                      is_rescaling, update_rescaling](vk::CommandBuffer cmdbuf) {
+                      is_rescaling, update_rescaling,
+                      uses_render_area = render_are.uses_render_area,
+                      render_area_data = render_are.words](vk::CommandBuffer cmdbuf) {
         if (bind_pipeline) {
             cmdbuf.BindPipeline(VK_PIPELINE_BIND_POINT_GRAPHICS, *pipeline);
         }
@@ -483,11 +494,16 @@ void GraphicsPipeline::ConfigureDraw(const RescalingPushConstant& rescaling) {
                              rescaling_data.data());
         if (update_rescaling) {
             const f32 config_down_factor{Settings::values.resolution_info.down_factor};
-            const f32 scale_down_factor{is_rescaling ? config_down_factor : 1.0f};
+            const f32 scale_down_factor{is_rescaling ? config_down_factor : 2.0f};
             cmdbuf.PushConstants(*pipeline_layout, VK_SHADER_STAGE_ALL_GRAPHICS,
                                  RESCALING_LAYOUT_DOWN_FACTOR_OFFSET, sizeof(scale_down_factor),
                                  &scale_down_factor);
         }
+        if (uses_render_area) {
+            cmdbuf.PushConstants(*pipeline_layout, VK_SHADER_STAGE_ALL_GRAPHICS,
+                                 RENDERAREA_LAYOUT_OFFSET, sizeof(render_area_data),
+                                 &render_area_data);
+        }
         if (!descriptor_set_layout) {
             return;
         }

src/video_core/renderer_vulkan/vk_graphics_pipeline.h

@@ -62,6 +62,7 @@ class Device;
 class PipelineStatistics;
 class RenderPassCache;
 class RescalingPushConstant;
+class RenderAreaPushConstant;
 class Scheduler;
 class UpdateDescriptorQueue;
 
@@ -113,7 +114,8 @@ private:
     template <typename Spec>
     void ConfigureImpl(bool is_indexed);
 
-    void ConfigureDraw(const RescalingPushConstant& rescaling);
+    void ConfigureDraw(const RescalingPushConstant& rescaling,
+                       const RenderAreaPushConstant& render_are);
 
     void MakePipeline(VkRenderPass render_pass);
 

src/video_core/renderer_vulkan/vk_rasterizer.cpp

@@ -682,6 +682,22 @@ void RasterizerVulkan::UpdateViewportsState(Tegra::Engines::Maxwell3D::Regs& reg
     if (!state_tracker.TouchViewports()) {
         return;
     }
+    if (!regs.viewport_transform_enabled) {
+        const auto x = static_cast<float>(regs.render_area.x);
+        const auto y = static_cast<float>(regs.render_area.y);
+        const auto width = static_cast<float>(regs.render_area.width);
+        const auto height = static_cast<float>(regs.render_area.height);
+        VkViewport viewport{
+            .x = x,
+            .y = y,
+            .width = width != 0.0f ? width : 1.0f,
+            .height = height != 0.0f ? height : 1.0f,
+            .minDepth = 0.0f,
+            .maxDepth = 1.0f,
+        };
+        scheduler.Record([viewport](vk::CommandBuffer cmdbuf) { cmdbuf.SetViewport(0, viewport); });
+        return;
+    }
     const bool is_rescaling{texture_cache.IsRescaling()};
     const float scale = is_rescaling ? Settings::values.resolution_info.up_factor : 1.0f;
     const std::array viewports{

src/video_core/shader_environment.cpp

@@ -191,6 +191,8 @@ void GenericEnvironment::Serialize(std::ofstream& file) const {
         .write(reinterpret_cast<const char*>(&start_address), sizeof(start_address))
         .write(reinterpret_cast<const char*>(&cached_lowest), sizeof(cached_lowest))
         .write(reinterpret_cast<const char*>(&cached_highest), sizeof(cached_highest))
+        .write(reinterpret_cast<const char*>(&viewport_transform_state),
+               sizeof(viewport_transform_state))
         .write(reinterpret_cast<const char*>(&stage), sizeof(stage))
         .write(reinterpret_cast<const char*>(code.data()), code_size);
     for (const auto& [key, type] : texture_types) {
@@ -311,6 +313,12 @@ Shader::TextureType GraphicsEnvironment::ReadTextureType(u32 handle) {
     return ReadTextureTypeImpl(regs.tic.Address(), regs.tic.limit, via_header_index, handle);
 }
 
+u32 GraphicsEnvironment::ReadViewportTransformState() {
+    const auto& regs{maxwell3d->regs};
+    viewport_transform_state = regs.viewport_transform_enabled;
+    return viewport_transform_state;
+}
+
 ComputeEnvironment::ComputeEnvironment(Tegra::Engines::KeplerCompute& kepler_compute_,
                                        Tegra::MemoryManager& gpu_memory_, GPUVAddr program_base_,
                                        u32 start_address_)
@@ -342,6 +350,10 @@ Shader::TextureType ComputeEnvironment::ReadTextureType(u32 handle) {
     return ReadTextureTypeImpl(regs.tic.Address(), regs.tic.limit, qmd.linked_tsc != 0, handle);
 }
 
+u32 ComputeEnvironment::ReadViewportTransformState() {
+    return viewport_transform_state;
+}
+
 void FileEnvironment::Deserialize(std::ifstream& file) {
     u64 code_size{};
     u64 num_texture_types{};
@@ -354,6 +366,7 @@ void FileEnvironment::Deserialize(std::ifstream& file) {
         .read(reinterpret_cast<char*>(&start_address), sizeof(start_address))
         .read(reinterpret_cast<char*>(&read_lowest), sizeof(read_lowest))
         .read(reinterpret_cast<char*>(&read_highest), sizeof(read_highest))
+        .read(reinterpret_cast<char*>(&viewport_transform_state), sizeof(viewport_transform_state))
         .read(reinterpret_cast<char*>(&stage), sizeof(stage));
     code = std::make_unique<u64[]>(Common::DivCeil(code_size, sizeof(u64)));
     file.read(reinterpret_cast<char*>(code.get()), code_size);
@@ -411,6 +424,10 @@ Shader::TextureType FileEnvironment::ReadTextureType(u32 handle) {
     return it->second;
 }
 
+u32 FileEnvironment::ReadViewportTransformState() {
+    return viewport_transform_state;
+}
+
 u32 FileEnvironment::LocalMemorySize() const {
     return local_memory_size;
 }

src/video_core/shader_environment.h

@@ -85,6 +85,8 @@ protected:
     u32 cached_highest = 0;
     u32 initial_offset = 0;
 
+    u32 viewport_transform_state = 1;
+
     bool has_unbound_instructions = false;
 };
 
@@ -102,6 +104,8 @@ public:
 
     Shader::TextureType ReadTextureType(u32 handle) override;
 
+    u32 ReadViewportTransformState() override;
+
 private:
     Tegra::Engines::Maxwell3D* maxwell3d{};
     size_t stage_index{};
@@ -120,6 +124,8 @@ public:
 
     Shader::TextureType ReadTextureType(u32 handle) override;
 
+    u32 ReadViewportTransformState() override;
+
 private:
     Tegra::Engines::KeplerCompute* kepler_compute{};
 };
@@ -143,6 +149,8 @@ public:
 
     [[nodiscard]] Shader::TextureType ReadTextureType(u32 handle) override;
 
+    [[nodiscard]] u32 ReadViewportTransformState() override;
+
     [[nodiscard]] u32 LocalMemorySize() const override;
 
     [[nodiscard]] u32 SharedMemorySize() const override;
@@ -164,6 +172,7 @@ private:
     u32 read_lowest{};
     u32 read_highest{};
     u32 initial_offset{};
+    u32 viewport_transform_state = 1;
 };
 
 void SerializePipeline(std::span<const char> key, std::span<const GenericEnvironment* const> envs,