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diff --git a/src/video_core/shader/shader.h b/src/video_core/shader/shader.h
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1// Copyright 2015 Citra Emulator Project
2// Licensed under GPLv2 or any later version
3// Refer to the license.txt file included.
4
5#pragma once
6
7#include <array>
8#include <cstddef>
9#include <functional>
10#include <type_traits>
11#include <nihstro/shader_bytecode.h>
12#include "common/assert.h"
13#include "common/common_funcs.h"
14#include "common/common_types.h"
15#include "common/vector_math.h"
16#include "video_core/pica_types.h"
17#include "video_core/regs_rasterizer.h"
18#include "video_core/regs_shader.h"
19
20using nihstro::RegisterType;
21using nihstro::SourceRegister;
22using nihstro::DestRegister;
23
24namespace Pica {
25
26namespace Shader {
27
28constexpr unsigned MAX_PROGRAM_CODE_LENGTH = 4096;
29constexpr unsigned MAX_SWIZZLE_DATA_LENGTH = 4096;
30
31struct AttributeBuffer {
32 alignas(16) Math::Vec4<float24> attr[16];
33};
34
35/// Handler type for receiving vertex outputs from vertex shader or geometry shader
36using VertexHandler = std::function<void(const AttributeBuffer&)>;
37
38/// Handler type for signaling to invert the vertex order of the next triangle
39using WindingSetter = std::function<void()>;
40
41struct OutputVertex {
42 Math::Vec4<float24> pos;
43 Math::Vec4<float24> quat;
44 Math::Vec4<float24> color;
45 Math::Vec2<float24> tc0;
46 Math::Vec2<float24> tc1;
47 float24 tc0_w;
48 INSERT_PADDING_WORDS(1);
49 Math::Vec3<float24> view;
50 INSERT_PADDING_WORDS(1);
51 Math::Vec2<float24> tc2;
52
53 static OutputVertex FromAttributeBuffer(const RasterizerRegs& regs,
54 const AttributeBuffer& output);
55};
56#define ASSERT_POS(var, pos) \
57 static_assert(offsetof(OutputVertex, var) == pos * sizeof(float24), "Semantic at wrong " \
58 "offset.")
59ASSERT_POS(pos, RasterizerRegs::VSOutputAttributes::POSITION_X);
60ASSERT_POS(quat, RasterizerRegs::VSOutputAttributes::QUATERNION_X);
61ASSERT_POS(color, RasterizerRegs::VSOutputAttributes::COLOR_R);
62ASSERT_POS(tc0, RasterizerRegs::VSOutputAttributes::TEXCOORD0_U);
63ASSERT_POS(tc1, RasterizerRegs::VSOutputAttributes::TEXCOORD1_U);
64ASSERT_POS(tc0_w, RasterizerRegs::VSOutputAttributes::TEXCOORD0_W);
65ASSERT_POS(view, RasterizerRegs::VSOutputAttributes::VIEW_X);
66ASSERT_POS(tc2, RasterizerRegs::VSOutputAttributes::TEXCOORD2_U);
67#undef ASSERT_POS
68static_assert(std::is_pod<OutputVertex>::value, "Structure is not POD");
69static_assert(sizeof(OutputVertex) == 24 * sizeof(float), "OutputVertex has invalid size");
70
71/**
72 * This structure contains state information for primitive emitting in geometry shader.
73 */
74struct GSEmitter {
75 std::array<std::array<Math::Vec4<float24>, 16>, 3> buffer;
76 u8 vertex_id;
77 bool prim_emit;
78 bool winding;
79 u32 output_mask;
80
81 // Function objects are hidden behind a raw pointer to make the structure standard layout type,
82 // for JIT to use offsetof to access other members.
83 struct Handlers {
84 VertexHandler vertex_handler;
85 WindingSetter winding_setter;
86 } * handlers;
87
88 GSEmitter();
89 ~GSEmitter();
90 void Emit(Math::Vec4<float24> (&vertex)[16]);
91};
92static_assert(std::is_standard_layout<GSEmitter>::value, "GSEmitter is not standard layout type");
93
94/**
95 * This structure contains the state information that needs to be unique for a shader unit. The 3DS
96 * has four shader units that process shaders in parallel. At the present, Citra only implements a
97 * single shader unit that processes all shaders serially. Putting the state information in a struct
98 * here will make it easier for us to parallelize the shader processing later.
99 */
100struct UnitState {
101 explicit UnitState(GSEmitter* emitter = nullptr);
102 struct Registers {
103 // The registers are accessed by the shader JIT using SSE instructions, and are therefore
104 // required to be 16-byte aligned.
105 alignas(16) Math::Vec4<float24> input[16];
106 alignas(16) Math::Vec4<float24> temporary[16];
107 alignas(16) Math::Vec4<float24> output[16];
108 } registers;
109 static_assert(std::is_pod<Registers>::value, "Structure is not POD");
110
111 bool conditional_code[2];
112
113 // Two Address registers and one loop counter
114 // TODO: How many bits do these actually have?
115 s32 address_registers[3];
116
117 GSEmitter* emitter_ptr;
118
119 static size_t InputOffset(const SourceRegister& reg) {
120 switch (reg.GetRegisterType()) {
121 case RegisterType::Input:
122 return offsetof(UnitState, registers.input) +
123 reg.GetIndex() * sizeof(Math::Vec4<float24>);
124
125 case RegisterType::Temporary:
126 return offsetof(UnitState, registers.temporary) +
127 reg.GetIndex() * sizeof(Math::Vec4<float24>);
128
129 default:
130 UNREACHABLE();
131 return 0;
132 }
133 }
134
135 static size_t OutputOffset(const DestRegister& reg) {
136 switch (reg.GetRegisterType()) {
137 case RegisterType::Output:
138 return offsetof(UnitState, registers.output) +
139 reg.GetIndex() * sizeof(Math::Vec4<float24>);
140
141 case RegisterType::Temporary:
142 return offsetof(UnitState, registers.temporary) +
143 reg.GetIndex() * sizeof(Math::Vec4<float24>);
144
145 default:
146 UNREACHABLE();
147 return 0;
148 }
149 }
150
151 /**
152 * Loads the unit state with an input vertex.
153 *
154 * @param config Shader configuration registers corresponding to the unit.
155 * @param input Attribute buffer to load into the input registers.
156 */
157 void LoadInput(const ShaderRegs& config, const AttributeBuffer& input);
158
159 void WriteOutput(const ShaderRegs& config, AttributeBuffer& output);
160};
161
162/**
163 * This is an extended shader unit state that represents the special unit that can run both vertex
164 * shader and geometry shader. It contains an additional primitive emitter and utilities for
165 * geometry shader.
166 */
167struct GSUnitState : public UnitState {
168 GSUnitState();
169 void SetVertexHandler(VertexHandler vertex_handler, WindingSetter winding_setter);
170 void ConfigOutput(const ShaderRegs& config);
171
172 GSEmitter emitter;
173};
174
175struct ShaderSetup {
176 struct {
177 // The float uniforms are accessed by the shader JIT using SSE instructions, and are
178 // therefore required to be 16-byte aligned.
179 alignas(16) Math::Vec4<float24> f[96];
180
181 std::array<bool, 16> b;
182 std::array<Math::Vec4<u8>, 4> i;
183 } uniforms;
184
185 static size_t GetFloatUniformOffset(unsigned index) {
186 return offsetof(ShaderSetup, uniforms.f) + index * sizeof(Math::Vec4<float24>);
187 }
188
189 static size_t GetBoolUniformOffset(unsigned index) {
190 return offsetof(ShaderSetup, uniforms.b) + index * sizeof(bool);
191 }
192
193 static size_t GetIntUniformOffset(unsigned index) {
194 return offsetof(ShaderSetup, uniforms.i) + index * sizeof(Math::Vec4<u8>);
195 }
196
197 std::array<u32, MAX_PROGRAM_CODE_LENGTH> program_code;
198 std::array<u32, MAX_SWIZZLE_DATA_LENGTH> swizzle_data;
199
200 /// Data private to ShaderEngines
201 struct EngineData {
202 unsigned int entry_point;
203 /// Used by the JIT, points to a compiled shader object.
204 const void* cached_shader = nullptr;
205 } engine_data;
206};
207
208class ShaderEngine {
209public:
210 virtual ~ShaderEngine() = default;
211
212 /**
213 * Performs any shader unit setup that only needs to happen once per shader (as opposed to once
214 * per vertex, which would happen within the `Run` function).
215 */
216 virtual void SetupBatch(ShaderSetup& setup, unsigned int entry_point) = 0;
217
218 /**
219 * Runs the currently setup shader.
220 *
221 * @param setup Shader engine state, must be setup with SetupBatch on each shader change.
222 * @param state Shader unit state, must be setup with input data before each shader invocation.
223 */
224 virtual void Run(const ShaderSetup& setup, UnitState& state) const = 0;
225};
226
227// TODO(yuriks): Remove and make it non-global state somewhere
228ShaderEngine* GetEngine();
229void Shutdown();
230
231} // namespace Shader
232
233} // namespace Pica
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