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// Copyright 2014 Citra Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.
#pragma once
#include <initializer_list>
#include <common/common_types.h>
#include "math.h"
#include "pica.h"
namespace Pica {
namespace VertexShader {
struct InputVertex {
Math::Vec4<float24> attr[16];
};
struct OutputVertex {
OutputVertex() = default;
// VS output attributes
Math::Vec4<float24> pos;
Math::Vec4<float24> dummy; // quaternions (not implemented, yet)
Math::Vec4<float24> color;
Math::Vec2<float24> tc0;
float24 tc0_v;
// Padding for optimal alignment
float24 pad[14];
// Attributes used to store intermediate results
// position after perspective divide
Math::Vec3<float24> screenpos;
// Linear interpolation
// factor: 0=this, 1=vtx
void Lerp(float24 factor, const OutputVertex& vtx) {
pos = pos * factor + vtx.pos * (float24::FromFloat32(1) - factor);
// TODO: Should perform perspective correct interpolation here...
tc0 = tc0 * factor + vtx.tc0 * (float24::FromFloat32(1) - factor);
screenpos = screenpos * factor + vtx.screenpos * (float24::FromFloat32(1) - factor);
color = color * factor + vtx.color * (float24::FromFloat32(1) - factor);
}
// Linear interpolation
// factor: 0=v0, 1=v1
static OutputVertex Lerp(float24 factor, const OutputVertex& v0, const OutputVertex& v1) {
OutputVertex ret = v0;
ret.Lerp(factor, v1);
return ret;
}
};
static_assert(std::is_pod<OutputVertex>::value, "Structure is not POD");
union Instruction {
enum class OpCode : u32 {
ADD = 0x0,
DP3 = 0x1,
DP4 = 0x2,
MUL = 0x8,
MAX = 0xC,
MIN = 0xD,
RCP = 0xE,
RSQ = 0xF,
MOV = 0x13,
RET = 0x21,
FLS = 0x22, // Flush
CALL = 0x24,
};
std::string GetOpCodeName() const {
std::map<OpCode, std::string> map = {
{ OpCode::ADD, "ADD" },
{ OpCode::DP3, "DP3" },
{ OpCode::DP4, "DP4" },
{ OpCode::MUL, "MUL" },
{ OpCode::MAX, "MAX" },
{ OpCode::MIN, "MIN" },
{ OpCode::RCP, "RCP" },
{ OpCode::RSQ, "RSQ" },
{ OpCode::MOV, "MOV" },
{ OpCode::RET, "RET" },
{ OpCode::FLS, "FLS" },
};
auto it = map.find(opcode);
if (it == map.end())
return "UNK";
else
return it->second;
}
u32 hex;
BitField<0x1a, 0x6, OpCode> opcode;
// General notes:
//
// When two input registers are used, one of them uses a 5-bit index while the other
// one uses a 7-bit index. This is because at most one floating point uniform may be used
// as an input.
// Format used e.g. by arithmetic instructions and comparisons
// "src1" and "src2" specify register indices (i.e. indices referring to groups of 4 floats),
// while "dest" addresses individual floats.
union {
BitField<0x00, 0x5, u32> operand_desc_id;
BitField<0x07, 0x5, u32> src2;
BitField<0x0c, 0x7, u32> src1;
BitField<0x13, 0x7, u32> dest;
} common;
// Format used for flow control instructions ("if")
union {
BitField<0x00, 0x8, u32> num_instructions;
BitField<0x0a, 0xc, u32> offset_words;
} flow_control;
};
union SwizzlePattern {
u32 hex;
enum class Selector : u32 {
x = 0,
y = 1,
z = 2,
w = 3
};
Selector GetSelectorSrc1(int comp) const {
Selector selectors[] = {
src1_selector_0, src1_selector_1, src1_selector_2, src1_selector_3
};
return selectors[comp];
}
Selector GetSelectorSrc2(int comp) const {
Selector selectors[] = {
src2_selector_0, src2_selector_1, src2_selector_2, src2_selector_3
};
return selectors[comp];
}
bool DestComponentEnabled(int i) const {
return (dest_mask & (0x8 >> i));
}
std::string SelectorToString(bool src2) const {
std::map<Selector, std::string> map = {
{ Selector::x, "x" },
{ Selector::y, "y" },
{ Selector::z, "z" },
{ Selector::w, "w" }
};
std::string ret;
for (int i = 0; i < 4; ++i) {
ret += map.at(src2 ? GetSelectorSrc2(i) : GetSelectorSrc1(i));
}
return ret;
}
std::string DestMaskToString() const {
std::string ret;
for (int i = 0; i < 4; ++i) {
if (!DestComponentEnabled(i))
ret += "_";
else
ret += "xyzw"[i];
}
return ret;
}
// Components of "dest" that should be written to: LSB=dest.w, MSB=dest.x
BitField< 0, 4, u32> dest_mask;
BitField< 5, 2, Selector> src1_selector_3;
BitField< 7, 2, Selector> src1_selector_2;
BitField< 9, 2, Selector> src1_selector_1;
BitField<11, 2, Selector> src1_selector_0;
BitField<14, 2, Selector> src2_selector_3;
BitField<16, 2, Selector> src2_selector_2;
BitField<18, 2, Selector> src2_selector_1;
BitField<20, 2, Selector> src2_selector_0;
BitField<31, 1, u32> flag; // not sure what this means, maybe it's the sign?
};
void SubmitShaderMemoryChange(u32 addr, u32 value);
void SubmitSwizzleDataChange(u32 addr, u32 value);
OutputVertex RunShader(const InputVertex& input, int num_attributes);
Math::Vec4<float24>& GetFloatUniform(u32 index);
} // namespace
} // namespace
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