summaryrefslogtreecommitdiffstats
path: root/src/video_core/shader/track.cpp
blob: 10739b37d1d910123cd0416b5f2febc5d4f8d72a (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
// Copyright 2018 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.

#include <algorithm>
#include <utility>
#include <variant>

#include "common/common_types.h"
#include "video_core/shader/node.h"
#include "video_core/shader/node_helper.h"
#include "video_core/shader/shader_ir.h"

namespace VideoCommon::Shader {

namespace {
std::pair<Node, s64> FindOperation(const NodeBlock& code, s64 cursor,
                                   OperationCode operation_code) {
    for (; cursor >= 0; --cursor) {
        Node node = code.at(cursor);

        if (const auto operation = std::get_if<OperationNode>(&*node)) {
            if (operation->GetCode() == operation_code) {
                return {std::move(node), cursor};
            }
        }

        if (const auto conditional = std::get_if<ConditionalNode>(&*node)) {
            const auto& conditional_code = conditional->GetCode();
            auto [found, internal_cursor] = FindOperation(
                conditional_code, static_cast<s64>(conditional_code.size() - 1), operation_code);
            if (found) {
                return {std::move(found), cursor};
            }
        }
    }
    return {};
}

std::optional<std::pair<Node, Node>> DecoupleIndirectRead(const OperationNode& operation) {
    if (operation.GetCode() != OperationCode::UAdd) {
        return std::nullopt;
    }
    Node gpr;
    Node offset;
    ASSERT(operation.GetOperandsCount() == 2);
    for (std::size_t i = 0; i < operation.GetOperandsCount(); i++) {
        Node operand = operation[i];
        if (std::holds_alternative<ImmediateNode>(*operand)) {
            offset = operation[i];
        } else if (std::holds_alternative<GprNode>(*operand)) {
            gpr = operation[i];
        }
    }
    if (offset && gpr) {
        return std::make_pair(gpr, offset);
    }
    return std::nullopt;
}

bool AmendNodeCv(std::size_t amend_index, Node node) {
    if (const auto operation = std::get_if<OperationNode>(&*node)) {
        operation->SetAmendIndex(amend_index);
        return true;
    } else if (const auto conditional = std::get_if<ConditionalNode>(&*node)) {
        conditional->SetAmendIndex(amend_index);
        return true;
    }
    return false;
}

} // Anonymous namespace

std::tuple<Node, TrackSampler> ShaderIR::TrackBindlessSampler(Node tracked, const NodeBlock& code,
                                                              s64 cursor) {
    if (const auto cbuf = std::get_if<CbufNode>(&*tracked)) {
        // Constant buffer found, test if it's an immediate
        const auto offset = cbuf->GetOffset();
        if (const auto immediate = std::get_if<ImmediateNode>(&*offset)) {
            auto track =
                MakeTrackSampler<BindlessSamplerNode>(cbuf->GetIndex(), immediate->GetValue());
            return {tracked, track};
        } else if (const auto operation = std::get_if<OperationNode>(&*offset)) {
            const u32 bound_buffer = registry.GetBoundBuffer();
            if (bound_buffer != cbuf->GetIndex()) {
                return {};
            }
            const auto pair = DecoupleIndirectRead(*operation);
            if (!pair) {
                return {};
            }
            auto [gpr, base_offset] = *pair;
            const auto offset_inm = std::get_if<ImmediateNode>(&*base_offset);
            const auto& gpu_driver = registry.AccessGuestDriverProfile();
            const u32 bindless_cv = NewCustomVariable();
            const Node op =
                Operation(OperationCode::UDiv, gpr, Immediate(gpu_driver.GetTextureHandlerSize()));

            const Node cv_node = GetCustomVariable(bindless_cv);
            Node amend_op = Operation(OperationCode::Assign, cv_node, std::move(op));
            const std::size_t amend_index = DeclareAmend(amend_op);
            AmendNodeCv(amend_index, code[cursor]);
            // TODO Implement Bindless Index custom variable
            auto track = MakeTrackSampler<ArraySamplerNode>(cbuf->GetIndex(),
                                                            offset_inm->GetValue(), bindless_cv);
            return {tracked, track};
        }
        return {};
    }
    if (const auto gpr = std::get_if<GprNode>(&*tracked)) {
        if (gpr->GetIndex() == Tegra::Shader::Register::ZeroIndex) {
            return {};
        }
        // Reduce the cursor in one to avoid infinite loops when the instruction sets the same
        // register that it uses as operand
        const auto [source, new_cursor] = TrackRegister(gpr, code, cursor - 1);
        if (!source) {
            return {};
        }
        return TrackBindlessSampler(source, code, new_cursor);
    }
    if (const auto operation = std::get_if<OperationNode>(&*tracked)) {
        for (std::size_t i = operation->GetOperandsCount(); i > 0; --i) {
            if (auto found = TrackBindlessSampler((*operation)[i - 1], code, cursor);
                std::get<0>(found)) {
                // Cbuf found in operand.
                return found;
            }
        }
        return {};
    }
    if (const auto conditional = std::get_if<ConditionalNode>(&*tracked)) {
        const auto& conditional_code = conditional->GetCode();
        return TrackBindlessSampler(tracked, conditional_code,
                                    static_cast<s64>(conditional_code.size()));
    }
    return {};
}

std::tuple<Node, u32, u32> ShaderIR::TrackCbuf(Node tracked, const NodeBlock& code,
                                               s64 cursor) const {
    if (const auto cbuf = std::get_if<CbufNode>(&*tracked)) {
        // Constant buffer found, test if it's an immediate
        const auto offset = cbuf->GetOffset();
        if (const auto immediate = std::get_if<ImmediateNode>(&*offset)) {
            return {tracked, cbuf->GetIndex(), immediate->GetValue()};
        }
        return {};
    }
    if (const auto gpr = std::get_if<GprNode>(&*tracked)) {
        if (gpr->GetIndex() == Tegra::Shader::Register::ZeroIndex) {
            return {};
        }
        s64 current_cursor = cursor;
        while (current_cursor > 0) {
            // Reduce the cursor in one to avoid infinite loops when the instruction sets the same
            // register that it uses as operand
            const auto [source, new_cursor] = TrackRegister(gpr, code, current_cursor - 1);
            current_cursor = new_cursor;
            if (!source) {
                continue;
            }
            const auto [base_address, index, offset] = TrackCbuf(source, code, current_cursor);
            if (base_address != nullptr) {
                return {base_address, index, offset};
            }
        }
        return {};
    }
    if (const auto operation = std::get_if<OperationNode>(&*tracked)) {
        for (std::size_t i = operation->GetOperandsCount(); i > 0; --i) {
            if (auto found = TrackCbuf((*operation)[i - 1], code, cursor); std::get<0>(found)) {
                // Cbuf found in operand.
                return found;
            }
        }
        return {};
    }
    if (const auto conditional = std::get_if<ConditionalNode>(&*tracked)) {
        const auto& conditional_code = conditional->GetCode();
        return TrackCbuf(tracked, conditional_code, static_cast<s64>(conditional_code.size()));
    }
    return {};
}

std::optional<u32> ShaderIR::TrackImmediate(Node tracked, const NodeBlock& code, s64 cursor) const {
    // Reduce the cursor in one to avoid infinite loops when the instruction sets the same register
    // that it uses as operand
    const auto [found, found_cursor] =
        TrackRegister(&std::get<GprNode>(*tracked), code, cursor - 1);
    if (!found) {
        return {};
    }
    if (const auto immediate = std::get_if<ImmediateNode>(&*found)) {
        return immediate->GetValue();
    }
    return {};
}

std::pair<Node, s64> ShaderIR::TrackRegister(const GprNode* tracked, const NodeBlock& code,
                                             s64 cursor) const {
    for (; cursor >= 0; --cursor) {
        const auto [found_node, new_cursor] = FindOperation(code, cursor, OperationCode::Assign);
        if (!found_node) {
            return {};
        }
        const auto operation = std::get_if<OperationNode>(&*found_node);
        ASSERT(operation);

        const auto& target = (*operation)[0];
        if (const auto gpr_target = std::get_if<GprNode>(&*target)) {
            if (gpr_target->GetIndex() == tracked->GetIndex()) {
                return {(*operation)[1], new_cursor};
            }
        }
    }
    return {};
}

} // namespace VideoCommon::Shader