5 files changed, 182 insertions, 6 deletions

diff --git a/src/video_core/engines/const_buffer_engine_interface.h b/src/video_core/engines/const_buffer_engine_interface.h
new file mode 100644
index 000000000..ac27b6cbe
--- /dev/null
+++ b/src/video_core/engines/const_buffer_engine_interface.h
@@ -0,0 +1,119 @@
+// Copyright 2019 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <type_traits>
+#include "common/bit_field.h"
+#include "common/common_types.h"
+#include "video_core/engines/shader_bytecode.h"
+#include "video_core/textures/texture.h"
+
+namespace Tegra::Engines {
+
+enum class ShaderType : u32 {
+    Vertex = 0,
+    TesselationControl = 1,
+    TesselationEval = 2,
+    Geometry = 3,
+    Fragment = 4,
+    Compute = 5,
+};
+
+struct SamplerDescriptor {
+    union {
+        BitField<0, 20, Tegra::Shader::TextureType> texture_type;
+        BitField<20, 1, u32> is_array;
+        BitField<21, 1, u32> is_buffer;
+        BitField<22, 1, u32> is_shadow;
+        u32 raw{};
+    };
+
+    bool operator==(const SamplerDescriptor& rhs) const noexcept {
+        return raw == rhs.raw;
+    }
+
+    bool operator!=(const SamplerDescriptor& rhs) const noexcept {
+        return !operator==(rhs);
+    }
+
+    static SamplerDescriptor FromTicTexture(Tegra::Texture::TextureType tic_texture_type) {
+        SamplerDescriptor result;
+        switch (tic_texture_type) {
+        case Tegra::Texture::TextureType::Texture1D:
+            result.texture_type.Assign(Tegra::Shader::TextureType::Texture1D);
+            result.is_array.Assign(0);
+            result.is_buffer.Assign(0);
+            result.is_shadow.Assign(0);
+            return result;
+        case Tegra::Texture::TextureType::Texture2D:
+            result.texture_type.Assign(Tegra::Shader::TextureType::Texture2D);
+            result.is_array.Assign(0);
+            result.is_buffer.Assign(0);
+            result.is_shadow.Assign(0);
+            return result;
+        case Tegra::Texture::TextureType::Texture3D:
+            result.texture_type.Assign(Tegra::Shader::TextureType::Texture3D);
+            result.is_array.Assign(0);
+            result.is_buffer.Assign(0);
+            result.is_shadow.Assign(0);
+            return result;
+        case Tegra::Texture::TextureType::TextureCubemap:
+            result.texture_type.Assign(Tegra::Shader::TextureType::TextureCube);
+            result.is_array.Assign(0);
+            result.is_buffer.Assign(0);
+            result.is_shadow.Assign(0);
+            return result;
+        case Tegra::Texture::TextureType::Texture1DArray:
+            result.texture_type.Assign(Tegra::Shader::TextureType::Texture1D);
+            result.is_array.Assign(1);
+            result.is_buffer.Assign(0);
+            result.is_shadow.Assign(0);
+            return result;
+        case Tegra::Texture::TextureType::Texture2DArray:
+            result.texture_type.Assign(Tegra::Shader::TextureType::Texture2D);
+            result.is_array.Assign(1);
+            result.is_buffer.Assign(0);
+            result.is_shadow.Assign(0);
+            return result;
+        case Tegra::Texture::TextureType::Texture1DBuffer:
+            result.texture_type.Assign(Tegra::Shader::TextureType::Texture1D);
+            result.is_array.Assign(0);
+            result.is_buffer.Assign(1);
+            result.is_shadow.Assign(0);
+            return result;
+        case Tegra::Texture::TextureType::Texture2DNoMipmap:
+            result.texture_type.Assign(Tegra::Shader::TextureType::Texture2D);
+            result.is_array.Assign(0);
+            result.is_buffer.Assign(0);
+            result.is_shadow.Assign(0);
+            return result;
+        case Tegra::Texture::TextureType::TextureCubeArray:
+            result.texture_type.Assign(Tegra::Shader::TextureType::TextureCube);
+            result.is_array.Assign(1);
+            result.is_buffer.Assign(0);
+            result.is_shadow.Assign(0);
+            return result;
+        default:
+            result.texture_type.Assign(Tegra::Shader::TextureType::Texture2D);
+            result.is_array.Assign(0);
+            result.is_buffer.Assign(0);
+            result.is_shadow.Assign(0);
+            return result;
+        }
+    }
+};
+static_assert(std::is_trivially_copyable_v<SamplerDescriptor>);
+
+class ConstBufferEngineInterface {
+public:
+    virtual ~ConstBufferEngineInterface() = default;
+    virtual u32 AccessConstBuffer32(ShaderType stage, u64 const_buffer, u64 offset) const = 0;
+    virtual SamplerDescriptor AccessBoundSampler(ShaderType stage, u64 offset) const = 0;
+    virtual SamplerDescriptor AccessBindlessSampler(ShaderType stage, u64 const_buffer,
+                                                    u64 offset) const = 0;
+    virtual u32 GetBoundBuffer() const = 0;
+};
+
+} // namespace Tegra::Engines
diff --git a/src/video_core/engines/kepler_compute.cpp b/src/video_core/engines/kepler_compute.cpp
index 63d449135..91adef360 100644
--- a/src/video_core/engines/kepler_compute.cpp
+++ b/src/video_core/engines/kepler_compute.cpp
@@ -70,13 +70,31 @@ Texture::FullTextureInfo KeplerCompute::GetTextureInfo(const Texture::TextureHan
                                     GetTSCEntry(tex_handle.tsc_id)};
 }
 
-u32 KeplerCompute::AccessConstBuffer32(u64 const_buffer, u64 offset) const {
+u32 KeplerCompute::AccessConstBuffer32(ShaderType stage, u64 const_buffer, u64 offset) const {
+    ASSERT(stage == ShaderType::Compute);
     const auto& buffer = launch_description.const_buffer_config[const_buffer];
     u32 result;
     std::memcpy(&result, memory_manager.GetPointer(buffer.Address() + offset), sizeof(u32));
     return result;
 }
 
+SamplerDescriptor KeplerCompute::AccessBoundSampler(ShaderType stage, u64 offset) const {
+    return AccessBindlessSampler(stage, regs.tex_cb_index, offset * sizeof(Texture::TextureHandle));
+}
+
+SamplerDescriptor KeplerCompute::AccessBindlessSampler(ShaderType stage, u64 const_buffer,
+                                                       u64 offset) const {
+    ASSERT(stage == ShaderType::Compute);
+    const auto& tex_info_buffer = launch_description.const_buffer_config[const_buffer];
+    const GPUVAddr tex_info_address = tex_info_buffer.Address() + offset;
+
+    const Texture::TextureHandle tex_handle{memory_manager.Read<u32>(tex_info_address)};
+    const Texture::FullTextureInfo tex_info = GetTextureInfo(tex_handle, offset);
+    SamplerDescriptor result = SamplerDescriptor::FromTicTexture(tex_info.tic.texture_type.Value());
+    result.is_shadow.Assign(tex_info.tsc.depth_compare_enabled.Value());
+    return result;
+}
+
 void KeplerCompute::ProcessLaunch() {
     const GPUVAddr launch_desc_loc = regs.launch_desc_loc.Address();
     memory_manager.ReadBlockUnsafe(launch_desc_loc, &launch_description,
diff --git a/src/video_core/engines/kepler_compute.h b/src/video_core/engines/kepler_compute.h
index 90cf650d2..8e7182727 100644
--- a/src/video_core/engines/kepler_compute.h
+++ b/src/video_core/engines/kepler_compute.h
@@ -10,6 +10,7 @@
 #include "common/bit_field.h"
 #include "common/common_funcs.h"
 #include "common/common_types.h"
+#include "video_core/engines/const_buffer_engine_interface.h"
 #include "video_core/engines/engine_upload.h"
 #include "video_core/gpu.h"
 #include "video_core/textures/texture.h"
@@ -37,7 +38,7 @@ namespace Tegra::Engines {
 #define KEPLER_COMPUTE_REG_INDEX(field_name)                                                       \
     (offsetof(Tegra::Engines::KeplerCompute::Regs, field_name) / sizeof(u32))
 
-class KeplerCompute final {
+class KeplerCompute final : public ConstBufferEngineInterface {
 public:
     explicit KeplerCompute(Core::System& system, VideoCore::RasterizerInterface& rasterizer,
                            MemoryManager& memory_manager);
@@ -201,7 +202,16 @@ public:
     Texture::FullTextureInfo GetTextureInfo(const Texture::TextureHandle tex_handle,
                                             std::size_t offset) const;
 
-    u32 AccessConstBuffer32(u64 const_buffer, u64 offset) const;
+    u32 AccessConstBuffer32(ShaderType stage, u64 const_buffer, u64 offset) const override;
+
+    SamplerDescriptor AccessBoundSampler(ShaderType stage, u64 offset) const override;
+
+    SamplerDescriptor AccessBindlessSampler(ShaderType stage, u64 const_buffer,
+                                            u64 offset) const override;
+
+    u32 GetBoundBuffer() const override {
+        return regs.tex_cb_index;
+    }
 
 private:
     Core::System& system;
diff --git a/src/video_core/engines/maxwell_3d.cpp b/src/video_core/engines/maxwell_3d.cpp
index 59976943a..558955451 100644
--- a/src/video_core/engines/maxwell_3d.cpp
+++ b/src/video_core/engines/maxwell_3d.cpp
@@ -847,7 +847,8 @@ void Maxwell3D::ProcessClearBuffers() {
     rasterizer.Clear();
 }
 
-u32 Maxwell3D::AccessConstBuffer32(Regs::ShaderStage stage, u64 const_buffer, u64 offset) const {
+u32 Maxwell3D::AccessConstBuffer32(ShaderType stage, u64 const_buffer, u64 offset) const {
+    ASSERT(stage != ShaderType::Compute);
     const auto& shader_stage = state.shader_stages[static_cast<std::size_t>(stage)];
     const auto& buffer = shader_stage.const_buffers[const_buffer];
     u32 result;
@@ -855,4 +856,22 @@ u32 Maxwell3D::AccessConstBuffer32(Regs::ShaderStage stage, u64 const_buffer, u6
     return result;
 }
 
+SamplerDescriptor Maxwell3D::AccessBoundSampler(ShaderType stage, u64 offset) const {
+    return AccessBindlessSampler(stage, regs.tex_cb_index, offset * sizeof(Texture::TextureHandle));
+}
+
+SamplerDescriptor Maxwell3D::AccessBindlessSampler(ShaderType stage, u64 const_buffer,
+                                                   u64 offset) const {
+    ASSERT(stage != ShaderType::Compute);
+    const auto& shader = state.shader_stages[static_cast<std::size_t>(stage)];
+    const auto& tex_info_buffer = shader.const_buffers[const_buffer];
+    const GPUVAddr tex_info_address = tex_info_buffer.address + offset;
+
+    const Texture::TextureHandle tex_handle{memory_manager.Read<u32>(tex_info_address)};
+    const Texture::FullTextureInfo tex_info = GetTextureInfo(tex_handle, offset);
+    SamplerDescriptor result = SamplerDescriptor::FromTicTexture(tex_info.tic.texture_type.Value());
+    result.is_shadow.Assign(tex_info.tsc.depth_compare_enabled.Value());
+    return result;
+}
+
 } // namespace Tegra::Engines
diff --git a/src/video_core/engines/maxwell_3d.h b/src/video_core/engines/maxwell_3d.h
index e3f1047d5..fa846a621 100644
--- a/src/video_core/engines/maxwell_3d.h
+++ b/src/video_core/engines/maxwell_3d.h
@@ -15,6 +15,7 @@
 #include "common/common_funcs.h"
 #include "common/common_types.h"
 #include "common/math_util.h"
+#include "video_core/engines/const_buffer_engine_interface.h"
 #include "video_core/engines/const_buffer_info.h"
 #include "video_core/engines/engine_upload.h"
 #include "video_core/gpu.h"
@@ -44,7 +45,7 @@ namespace Tegra::Engines {
 #define MAXWELL3D_REG_INDEX(field_name)                                                            \
     (offsetof(Tegra::Engines::Maxwell3D::Regs, field_name) / sizeof(u32))
 
-class Maxwell3D final {
+class Maxwell3D final : public ConstBufferEngineInterface {
 public:
     explicit Maxwell3D(Core::System& system, VideoCore::RasterizerInterface& rasterizer,
                        MemoryManager& memory_manager);
@@ -1257,7 +1258,16 @@ public:
     /// Returns the texture information for a specific texture in a specific shader stage.
     Texture::FullTextureInfo GetStageTexture(Regs::ShaderStage stage, std::size_t offset) const;
 
-    u32 AccessConstBuffer32(Regs::ShaderStage stage, u64 const_buffer, u64 offset) const;
+    u32 AccessConstBuffer32(ShaderType stage, u64 const_buffer, u64 offset) const override;
+
+    SamplerDescriptor AccessBoundSampler(ShaderType stage, u64 offset) const override;
+
+    SamplerDescriptor AccessBindlessSampler(ShaderType stage, u64 const_buffer,
+                                            u64 offset) const override;
+
+    u32 GetBoundBuffer() const override {
+        return regs.tex_cb_index;
+    }
 
     /// Memory for macro code - it's undetermined how big this is, however 1MB is much larger than
     /// we've seen used.