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citra/src/video_core/engines/kepler_compute.h
ReinUsesLisp 5b2b6d594c shader/texture: Join separate image and sampler pairs offline 
Games using D3D idioms can join images and samplers when a shader
executes, instead of baking them into a combined sampler image. This is
also possible on Vulkan.

One approach to this solution would be to use separate samplers on
Vulkan and leave this unimplemented on OpenGL, but we can't do this
because there's no consistent way of determining which constant buffer
holds a sampler and which one an image. We could in theory find the
first bit and if it's in the TIC area, it's an image; but this falls
apart when an image or sampler handle use an index of zero.

The used approach is to track for a LOP.OR operation (this is done at an
IR level, not at an ISA level), track again the constant buffers used as
source and store this pair. Then, outside of shader execution, join
the sample and image pair with a bitwise or operation.

This approach won't work on games that truly use separate samplers in a
meaningful way. For example, pooling textures in a 2D array and
determining at runtime what sampler to use.

This invalidates OpenGL's disk shader cache :)

- Used mostly by D3D ports to Switch
2020-06-05 00:24:51 -03:00

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// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#pragma once
#include <array>
#include <cstddef>
#include <vector>
#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_interface.h"
#include "video_core/engines/engine_upload.h"
#include "video_core/engines/shader_type.h"
#include "video_core/gpu.h"
#include "video_core/textures/texture.h"
namespace Core {
class System;
}
namespace Tegra {
class MemoryManager;
}
namespace VideoCore {
class RasterizerInterface;
}
namespace Tegra::Engines {
/**
* This Engine is known as GK104_Compute. Documentation can be found in:
* https://github.com/envytools/envytools/blob/master/rnndb/graph/gk104_compute.xml
* https://cgit.freedesktop.org/mesa/mesa/tree/src/gallium/drivers/nouveau/nvc0/nve4_compute.xml.h
*/
#define KEPLER_COMPUTE_REG_INDEX(field_name) \
(offsetof(Tegra::Engines::KeplerCompute::Regs, field_name) / sizeof(u32))
class KeplerCompute final : public ConstBufferEngineInterface, public EngineInterface {
public:
explicit KeplerCompute(Core::System& system, VideoCore::RasterizerInterface& rasterizer,
MemoryManager& memory_manager);
~KeplerCompute();
static constexpr std::size_t NumConstBuffers = 8;
struct Regs {
static constexpr std::size_t NUM_REGS = 0xCF8;
union {
struct {
INSERT_UNION_PADDING_WORDS(0x60);
Upload::Registers upload;
struct {
union {
BitField<0, 1, u32> linear;
};
} exec_upload;
u32 data_upload;
INSERT_UNION_PADDING_WORDS(0x3F);
struct {
u32 address;
GPUVAddr Address() const {
return static_cast<GPUVAddr>((static_cast<GPUVAddr>(address) << 8));
}
} launch_desc_loc;
INSERT_UNION_PADDING_WORDS(0x1);
u32 launch;
INSERT_UNION_PADDING_WORDS(0x4A7);
struct {
u32 address_high;
u32 address_low;
u32 limit;
GPUVAddr Address() const {
return static_cast<GPUVAddr>((static_cast<GPUVAddr>(address_high) << 32) |
address_low);
}
} tsc;
INSERT_UNION_PADDING_WORDS(0x3);
struct {
u32 address_high;
u32 address_low;
u32 limit;
GPUVAddr Address() const {
return static_cast<GPUVAddr>((static_cast<GPUVAddr>(address_high) << 32) |
address_low);
}
} tic;
INSERT_UNION_PADDING_WORDS(0x22);
struct {
u32 address_high;
u32 address_low;
GPUVAddr Address() const {
return static_cast<GPUVAddr>((static_cast<GPUVAddr>(address_high) << 32) |
address_low);
}
} code_loc;
INSERT_UNION_PADDING_WORDS(0x3FE);
u32 tex_cb_index;
INSERT_UNION_PADDING_WORDS(0x374);
};
std::array<u32, NUM_REGS> reg_array;
};
} regs{};
struct LaunchParams {
static constexpr std::size_t NUM_LAUNCH_PARAMETERS = 0x40;
INSERT_PADDING_WORDS(0x8);
u32 program_start;
INSERT_PADDING_WORDS(0x2);
BitField<30, 1, u32> linked_tsc;
BitField<0, 31, u32> grid_dim_x;
union {
BitField<0, 16, u32> grid_dim_y;
BitField<16, 16, u32> grid_dim_z;
};
INSERT_PADDING_WORDS(0x3);
BitField<0, 18, u32> shared_alloc;
BitField<16, 16, u32> block_dim_x;
union {
BitField<0, 16, u32> block_dim_y;
BitField<16, 16, u32> block_dim_z;
};
union {
BitField<0, 8, u32> const_buffer_enable_mask;
BitField<29, 2, u32> cache_layout;
};
INSERT_PADDING_WORDS(0x8);
struct ConstBufferConfig {
u32 address_low;
union {
BitField<0, 8, u32> address_high;
BitField<15, 17, u32> size;
};
GPUVAddr Address() const {
return static_cast<GPUVAddr>((static_cast<GPUVAddr>(address_high.Value()) << 32) |
address_low);
}
};
std::array<ConstBufferConfig, NumConstBuffers> const_buffer_config;
union {
BitField<0, 20, u32> local_pos_alloc;
BitField<27, 5, u32> barrier_alloc;
};
union {
BitField<0, 20, u32> local_neg_alloc;
BitField<24, 5, u32> gpr_alloc;
};
union {
BitField<0, 20, u32> local_crs_alloc;
BitField<24, 5, u32> sass_version;
};
INSERT_PADDING_WORDS(0x10);
} launch_description{};
struct {
u32 write_offset = 0;
u32 copy_size = 0;
std::vector<u8> inner_buffer;
} state{};
static_assert(sizeof(Regs) == Regs::NUM_REGS * sizeof(u32),
"KeplerCompute Regs has wrong size");
static_assert(sizeof(LaunchParams) == LaunchParams::NUM_LAUNCH_PARAMETERS * sizeof(u32),
"KeplerCompute LaunchParams has wrong size");
/// Write the value to the register identified by method.
void CallMethod(u32 method, u32 method_argument, bool is_last_call) override;
/// Write multiple values to the register identified by method.
void CallMultiMethod(u32 method, const u32* base_start, u32 amount,
u32 methods_pending) override;
Texture::FullTextureInfo GetTexture(std::size_t offset) const;
/// Given a texture handle, returns the TSC and TIC entries.
Texture::FullTextureInfo GetTextureInfo(Texture::TextureHandle tex_handle) 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;
SamplerDescriptor AccessSampler(u32 handle) const override;
u32 GetBoundBuffer() const override {
return regs.tex_cb_index;
}
VideoCore::GuestDriverProfile& AccessGuestDriverProfile() override;
const VideoCore::GuestDriverProfile& AccessGuestDriverProfile() const override;
private:
Core::System& system;
VideoCore::RasterizerInterface& rasterizer;
MemoryManager& memory_manager;
Upload::State upload_state;
void ProcessLaunch();
/// Retrieves information about a specific TIC entry from the TIC buffer.
Texture::TICEntry GetTICEntry(u32 tic_index) const;
/// Retrieves information about a specific TSC entry from the TSC buffer.
Texture::TSCEntry GetTSCEntry(u32 tsc_index) const;
};
#define ASSERT_REG_POSITION(field_name, position) \
static_assert(offsetof(KeplerCompute::Regs, field_name) == position * 4, \
"Field " #field_name " has invalid position")
#define ASSERT_LAUNCH_PARAM_POSITION(field_name, position) \
static_assert(offsetof(KeplerCompute::LaunchParams, field_name) == position * 4, \
"Field " #field_name " has invalid position")
ASSERT_REG_POSITION(upload, 0x60);
ASSERT_REG_POSITION(exec_upload, 0x6C);
ASSERT_REG_POSITION(data_upload, 0x6D);
ASSERT_REG_POSITION(launch, 0xAF);
ASSERT_REG_POSITION(tsc, 0x557);
ASSERT_REG_POSITION(tic, 0x55D);
ASSERT_REG_POSITION(code_loc, 0x582);
ASSERT_REG_POSITION(tex_cb_index, 0x982);
ASSERT_LAUNCH_PARAM_POSITION(program_start, 0x8);
ASSERT_LAUNCH_PARAM_POSITION(grid_dim_x, 0xC);
ASSERT_LAUNCH_PARAM_POSITION(shared_alloc, 0x11);
ASSERT_LAUNCH_PARAM_POSITION(block_dim_x, 0x12);
ASSERT_LAUNCH_PARAM_POSITION(const_buffer_enable_mask, 0x14);
ASSERT_LAUNCH_PARAM_POSITION(const_buffer_config, 0x1D);
#undef ASSERT_REG_POSITION
} // namespace Tegra::Engines
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