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
|
// Copyright 2021 yuzu Emulator Project
// Licensed under GPLv2 or any later version
// Refer to the license.txt file included.
#include "common/bit_field.h"
#include "common/common_types.h"
#include "shader_recompiler/exception.h"
#include "shader_recompiler/frontend/ir/ir_emitter.h"
#include "shader_recompiler/frontend/maxwell/opcodes.h"
#include "shader_recompiler/frontend/maxwell/translate/impl/impl.h"
namespace Shader::Maxwell {
namespace {
enum class InterpolationMode : u64 {
Pass,
Multiply,
Constant,
Sc,
};
enum class SampleMode : u64 {
Default,
Centroid,
Offset,
};
} // Anonymous namespace
void TranslatorVisitor::IPA(u64 insn) {
// IPA is the instruction used to read varyings from a fragment shader.
// gl_FragCoord is mapped to the gl_Position attribute.
// It yields unknown results when used outside of the fragment shader stage.
union {
u64 raw;
BitField<0, 8, IR::Reg> dest_reg;
BitField<8, 8, IR::Reg> index_reg;
BitField<20, 8, IR::Reg> multiplier;
BitField<30, 8, IR::Attribute> attribute;
BitField<38, 1, u64> idx;
BitField<51, 1, u64> sat;
BitField<52, 2, SampleMode> sample_mode;
BitField<54, 2, InterpolationMode> interpolation_mode;
} const ipa{insn};
// Indexed IPAs are used for indexed varyings.
// For example:
//
// in vec4 colors[4];
// uniform int idx;
// void main() {
// gl_FragColor = colors[idx];
// }
const bool is_indexed{ipa.idx != 0 && ipa.index_reg != IR::Reg::RZ};
if (is_indexed) {
throw NotImplementedException("IPA.IDX");
}
const IR::Attribute attribute{ipa.attribute};
IR::F32 value{ir.GetAttribute(attribute)};
if (IR::IsGeneric(attribute)) {
// const bool is_perspective{UnimplementedReadHeader(GenericAttributeIndex(attribute))};
const bool is_perspective{false};
if (is_perspective) {
const IR::F32 rcp_position_w{ir.FPRecip(ir.GetAttribute(IR::Attribute::PositionW))};
value = ir.FPMul(value, rcp_position_w);
}
}
switch (ipa.interpolation_mode) {
case InterpolationMode::Pass:
break;
case InterpolationMode::Multiply:
value = ir.FPMul(value, F(ipa.multiplier));
break;
case InterpolationMode::Constant:
throw NotImplementedException("IPA.CONSTANT");
case InterpolationMode::Sc:
throw NotImplementedException("IPA.SC");
}
// Saturated IPAs are generally generated out of clamped varyings.
// For example: clamp(some_varying, 0.0, 1.0)
const bool is_saturated{ipa.sat != 0};
if (is_saturated) {
if (attribute == IR::Attribute::FrontFace) {
throw NotImplementedException("IPA.SAT on FrontFace");
}
value = ir.FPSaturate(value);
}
F(ipa.dest_reg, value);
}
} // namespace Shader::Maxwell
|
