diff --git a/src/video_core/CMakeLists.txt b/src/video_core/CMakeLists.txt
index 0bb491976..6a5d5764b 100644
--- a/src/video_core/CMakeLists.txt
+++ b/src/video_core/CMakeLists.txt
@@ -28,6 +28,8 @@ add_library(video_core STATIC
renderer_opengl/gl_rasterizer_cache.cpp
renderer_opengl/gl_rasterizer_cache.h
renderer_opengl/gl_resource_manager.h
+ renderer_opengl/gl_shader_decompiler.cpp
+ renderer_opengl/gl_shader_decompiler.h
renderer_opengl/gl_shader_gen.cpp
renderer_opengl/gl_shader_gen.h
renderer_opengl/gl_shader_util.cpp
diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.cpp b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
new file mode 100644
index 000000000..cac646b5d
--- /dev/null
+++ b/src/video_core/renderer_opengl/gl_shader_decompiler.cpp
@@ -0,0 +1,928 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <exception>
+#include <map>
+#include <set>
+#include <string>
+#include <tuple>
+#include <utility>
+#include <nihstro/shader_bytecode.h>
+#include "common/assert.h"
+#include "common/common_types.h"
+#include "video_core/renderer_opengl/gl_shader_decompiler.h"
+
+namespace Pica {
+namespace Shader {
+namespace Decompiler {
+
+using nihstro::Instruction;
+using nihstro::OpCode;
+using nihstro::RegisterType;
+using nihstro::SourceRegister;
+using nihstro::SwizzlePattern;
+
+constexpr u32 PROGRAM_END = MAX_PROGRAM_CODE_LENGTH;
+
+class DecompileFail : public std::runtime_error {
+public:
+ using std::runtime_error::runtime_error;
+};
+
+/// Describes the behaviour of code path of a given entry point and a return point.
+enum class ExitMethod {
+ Undetermined, ///< Internal value. Only occur when analyzing JMP loop.
+ AlwaysReturn, ///< All code paths reach the return point.
+ Conditional, ///< Code path reaches the return point or an END instruction conditionally.
+ AlwaysEnd, ///< All code paths reach a END instruction.
+};
+
+/// A subroutine is a range of code refereced by a CALL, IF or LOOP instruction.
+struct Subroutine {
+ /// Generates a name suitable for GLSL source code.
+ std::string GetName() const {
+ return "sub_" + std::to_string(begin) + "_" + std::to_string(end);
+ }
+
+ u32 begin; ///< Entry point of the subroutine.
+ u32 end; ///< Return point of the subroutine.
+ ExitMethod exit_method; ///< Exit method of the subroutine.
+ std::set<u32> labels; ///< Addresses refereced by JMP instructions.
+
+ bool operator<(const Subroutine& rhs) const {
+ return std::tie(begin, end) < std::tie(rhs.begin, rhs.end);
+ }
+};
+
+/// Analyzes shader code and produces a set of subroutines.
+class ControlFlowAnalyzer {
+public:
+ ControlFlowAnalyzer(const ProgramCode& program_code, u32 main_offset)
+ : program_code(program_code) {
+
+ // Recursively finds all subroutines.
+ const Subroutine& program_main = AddSubroutine(main_offset, PROGRAM_END);
+ if (program_main.exit_method != ExitMethod::AlwaysEnd)
+ throw DecompileFail("Program does not always end");
+ }
+
+ std::set<Subroutine> MoveSubroutines() {
+ return std::move(subroutines);
+ }
+
+private:
+ const ProgramCode& program_code;
+ std::set<Subroutine> subroutines;
+ std::map<std::pair<u32, u32>, ExitMethod> exit_method_map;
+
+ /// Adds and analyzes a new subroutine if it is not added yet.
+ const Subroutine& AddSubroutine(u32 begin, u32 end) {
+ auto iter = subroutines.find(Subroutine{begin, end});
+ if (iter != subroutines.end())
+ return *iter;
+
+ Subroutine subroutine{begin, end};
+ subroutine.exit_method = Scan(begin, end, subroutine.labels);
+ if (subroutine.exit_method == ExitMethod::Undetermined)
+ throw DecompileFail("Recursive function detected");
+ return *subroutines.insert(std::move(subroutine)).first;
+ }
+
+ /// Merges exit method of two parallel branches.
+ static ExitMethod ParallelExit(ExitMethod a, ExitMethod b) {
+ if (a == ExitMethod::Undetermined) {
+ return b;
+ }
+ if (b == ExitMethod::Undetermined) {
+ return a;
+ }
+ if (a == b) {
+ return a;
+ }
+ return ExitMethod::Conditional;
+ }
+
+ /// Cascades exit method of two blocks of code.
+ static ExitMethod SeriesExit(ExitMethod a, ExitMethod b) {
+ // This should be handled before evaluating b.
+ DEBUG_ASSERT(a != ExitMethod::AlwaysEnd);
+
+ if (a == ExitMethod::Undetermined) {
+ return ExitMethod::Undetermined;
+ }
+
+ if (a == ExitMethod::AlwaysReturn) {
+ return b;
+ }
+
+ if (b == ExitMethod::Undetermined || b == ExitMethod::AlwaysEnd) {
+ return ExitMethod::AlwaysEnd;
+ }
+
+ return ExitMethod::Conditional;
+ }
+
+ /// Scans a range of code for labels and determines the exit method.
+ ExitMethod Scan(u32 begin, u32 end, std::set<u32>& labels) {
+ auto [iter, inserted] =
+ exit_method_map.emplace(std::make_pair(begin, end), ExitMethod::Undetermined);
+ ExitMethod& exit_method = iter->second;
+ if (!inserted)
+ return exit_method;
+
+ for (u32 offset = begin; offset != end && offset != PROGRAM_END; ++offset) {
+ const Instruction instr = {program_code[offset]};
+ switch (instr.opcode.Value()) {
+ case OpCode::Id::END: {
+ return exit_method = ExitMethod::AlwaysEnd;
+ }
+ case OpCode::Id::JMPC:
+ case OpCode::Id::JMPU: {
+ labels.insert(instr.flow_control.dest_offset);
+ ExitMethod no_jmp = Scan(offset + 1, end, labels);
+ ExitMethod jmp = Scan(instr.flow_control.dest_offset, end, labels);
+ return exit_method = ParallelExit(no_jmp, jmp);
+ }
+ case OpCode::Id::CALL: {
+ auto& call = AddSubroutine(instr.flow_control.dest_offset,
+ instr.flow_control.dest_offset +
+ instr.flow_control.num_instructions);
+ if (call.exit_method == ExitMethod::AlwaysEnd)
+ return exit_method = ExitMethod::AlwaysEnd;
+ ExitMethod after_call = Scan(offset + 1, end, labels);
+ return exit_method = SeriesExit(call.exit_method, after_call);
+ }
+ case OpCode::Id::LOOP: {
+ auto& loop = AddSubroutine(offset + 1, instr.flow_control.dest_offset + 1);
+ if (loop.exit_method == ExitMethod::AlwaysEnd)
+ return exit_method = ExitMethod::AlwaysEnd;
+ ExitMethod after_loop = Scan(instr.flow_control.dest_offset + 1, end, labels);
+ return exit_method = SeriesExit(loop.exit_method, after_loop);
+ }
+ case OpCode::Id::CALLC:
+ case OpCode::Id::CALLU: {
+ auto& call = AddSubroutine(instr.flow_control.dest_offset,
+ instr.flow_control.dest_offset +
+ instr.flow_control.num_instructions);
+ ExitMethod after_call = Scan(offset + 1, end, labels);
+ return exit_method = SeriesExit(
+ ParallelExit(call.exit_method, ExitMethod::AlwaysReturn), after_call);
+ }
+ case OpCode::Id::IFU:
+ case OpCode::Id::IFC: {
+ auto& if_sub = AddSubroutine(offset + 1, instr.flow_control.dest_offset);
+ ExitMethod else_method;
+ if (instr.flow_control.num_instructions != 0) {
+ auto& else_sub = AddSubroutine(instr.flow_control.dest_offset,
+ instr.flow_control.dest_offset +
+ instr.flow_control.num_instructions);
+ else_method = else_sub.exit_method;
+ } else {
+ else_method = ExitMethod::AlwaysReturn;
+ }
+
+ ExitMethod both = ParallelExit(if_sub.exit_method, else_method);
+ if (both == ExitMethod::AlwaysEnd)
+ return exit_method = ExitMethod::AlwaysEnd;
+ ExitMethod after_call =
+ Scan(instr.flow_control.dest_offset + instr.flow_control.num_instructions, end,
+ labels);
+ return exit_method = SeriesExit(both, after_call);
+ }
+ }
+ }
+ return exit_method = ExitMethod::AlwaysReturn;
+ }
+};
+
+class ShaderWriter {
+public:
+ void AddLine(const std::string& text) {
+ DEBUG_ASSERT(scope >= 0);
+ if (!text.empty()) {
+ shader_source += std::string(static_cast<size_t>(scope) * 4, ' ');
+ }
+ shader_source += text + '\n';
+ }
+
+ std::string MoveResult() {
+ return std::move(shader_source);
+ }
+
+ int scope = 0;
+
+private:
+ std::string shader_source;
+};
+
+/// An adaptor for getting swizzle pattern string from nihstro interfaces.
+template <SwizzlePattern::Selector (SwizzlePattern::*getter)(int) const>
+std::string GetSelectorSrc(const SwizzlePattern& pattern) {
+ std::string out;
+ for (std::size_t i = 0; i < 4; ++i) {
+ switch ((pattern.*getter)(i)) {
+ case SwizzlePattern::Selector::x:
+ out += "x";
+ break;
+ case SwizzlePattern::Selector::y:
+ out += "y";
+ break;
+ case SwizzlePattern::Selector::z:
+ out += "z";
+ break;
+ case SwizzlePattern::Selector::w:
+ out += "w";
+ break;
+ default:
+ UNREACHABLE();
+ return "";
+ }
+ }
+ return out;
+}
+
+constexpr auto GetSelectorSrc1 = GetSelectorSrc<&SwizzlePattern::GetSelectorSrc1>;
+constexpr auto GetSelectorSrc2 = GetSelectorSrc<&SwizzlePattern::GetSelectorSrc2>;
+constexpr auto GetSelectorSrc3 = GetSelectorSrc<&SwizzlePattern::GetSelectorSrc3>;
+
+class GLSLGenerator {
+public:
+ GLSLGenerator(const std::set<Subroutine>& subroutines, const ProgramCode& program_code,
+ const SwizzleData& swizzle_data, u32 main_offset,
+ const RegGetter& inputreg_getter, const RegGetter& outputreg_getter,
+ bool sanitize_mul, bool is_gs)
+ : subroutines(subroutines), program_code(program_code), swizzle_data(swizzle_data),
+ main_offset(main_offset), inputreg_getter(inputreg_getter),
+ outputreg_getter(outputreg_getter), sanitize_mul(sanitize_mul), is_gs(is_gs) {
+
+ Generate();
+ }
+
+ std::string MoveShaderCode() {
+ return shader.MoveResult();
+ }
+
+private:
+ /// Gets the Subroutine object corresponding to the specified address.
+ const Subroutine& GetSubroutine(u32 begin, u32 end) const {
+ auto iter = subroutines.find(Subroutine{begin, end});
+ ASSERT(iter != subroutines.end());
+ return *iter;
+ }
+
+ /// Generates condition evaluation code for the flow control instruction.
+ static std::string EvaluateCondition(Instruction::FlowControlType flow_control) {
+ using Op = Instruction::FlowControlType::Op;
+
+ std::string result_x =
+ flow_control.refx.Value() ? "conditional_code.x" : "!conditional_code.x";
+ std::string result_y =
+ flow_control.refy.Value() ? "conditional_code.y" : "!conditional_code.y";
+
+ switch (flow_control.op) {
+ case Op::JustX:
+ return result_x;
+ case Op::JustY:
+ return result_y;
+ case Op::Or:
+ case Op::And: {
+ std::string and_or = flow_control.op == Op::Or ? "any" : "all";
+ std::string bvec;
+ if (flow_control.refx.Value() && flow_control.refy.Value()) {
+ bvec = "conditional_code";
+ } else if (!flow_control.refx.Value() && !flow_control.refy.Value()) {
+ bvec = "not(conditional_code)";
+ } else {
+ bvec = "bvec2(" + result_x + ", " + result_y + ")";
+ }
+ return and_or + "(" + bvec + ")";
+ }
+ default:
+ UNREACHABLE();
+ return "";
+ }
+ }
+
+ /// Generates code representing a source register.
+ std::string GetSourceRegister(const SourceRegister& source_reg,
+ u32 address_register_index) const {
+ u32 index = static_cast<u32>(source_reg.GetIndex());
+ std::string index_str = std::to_string(index);
+
+ switch (source_reg.GetRegisterType()) {
+ case RegisterType::Input:
+ return inputreg_getter(index);
+ case RegisterType::Temporary:
+ return "reg_tmp" + index_str;
+ case RegisterType::FloatUniform:
+ if (address_register_index != 0) {
+ index_str +=
+ std::string(" + address_registers.") + "xyz"[address_register_index - 1];
+ }
+ return "uniforms.f[" + index_str + "]";
+ default:
+ UNREACHABLE();
+ return "";
+ }
+ }
+
+ /// Generates code representing a destination register.
+ std::string GetDestRegister(const DestRegister& dest_reg) const {
+ u32 index = static_cast<u32>(dest_reg.GetIndex());
+
+ switch (dest_reg.GetRegisterType()) {
+ case RegisterType::Output:
+ return outputreg_getter(index);
+ case RegisterType::Temporary:
+ return "reg_tmp" + std::to_string(index);
+ default:
+ UNREACHABLE();
+ return "";
+ }
+ }
+
+ /// Generates code representing a bool uniform
+ std::string GetUniformBool(u32 index) const {
+ if (is_gs && index == 15) {
+ // The uniform b15 is set to true after every geometry shader invocation.
+ return "((gl_PrimitiveIDIn == 0) || uniforms.b[15])";
+ }
+ return "uniforms.b[" + std::to_string(index) + "]";
+ }
+
+ /**
+ * Adds code that calls a subroutine.
+ * @param subroutine the subroutine to call.
+ */
+ void CallSubroutine(const Subroutine& subroutine) {
+ if (subroutine.exit_method == ExitMethod::AlwaysEnd) {
+ shader.AddLine(subroutine.GetName() + "();");
+ shader.AddLine("return true;");
+ } else if (subroutine.exit_method == ExitMethod::Conditional) {
+ shader.AddLine("if (" + subroutine.GetName() + "()) { return true; }");
+ } else {
+ shader.AddLine(subroutine.GetName() + "();");
+ }
+ }
+
+ /**
+ * Writes code that does an assignment operation.
+ * @param swizzle the swizzle data of the current instruction.
+ * @param reg the destination register code.
+ * @param value the code representing the value to assign.
+ * @param dest_num_components number of components of the destination register.
+ * @param value_num_components number of components of the value to assign.
+ */
+ void SetDest(const SwizzlePattern& swizzle, const std::string& reg, const std::string& value,
+ u32 dest_num_components, u32 value_num_components) {
+ u32 dest_mask_num_components = 0;
+ std::string dest_mask_swizzle = ".";
+
+ for (u32 i = 0; i < dest_num_components; ++i) {
+ if (swizzle.DestComponentEnabled(static_cast<int>(i))) {
+ dest_mask_swizzle += "xyzw"[i];
+ ++dest_mask_num_components;
+ }
+ }
+
+ if (reg.empty() || dest_mask_num_components == 0) {
+ return;
+ }
+ DEBUG_ASSERT(value_num_components >= dest_num_components || value_num_components == 1);
+
+ std::string dest = reg + (dest_num_components != 1 ? dest_mask_swizzle : "");
+
+ std::string src = value;
+ if (value_num_components == 1) {
+ if (dest_mask_num_components != 1) {
+ src = "vec" + std::to_string(dest_mask_num_components) + "(" + value + ")";
+ }
+ } else if (value_num_components != dest_mask_num_components) {
+ src = "(" + value + ")" + dest_mask_swizzle;
+ }
+
+ shader.AddLine(dest + " = " + src + ";");
+ }
+
+ /**
+ * Compiles a single instruction from PICA to GLSL.
+ * @param offset the offset of the PICA shader instruction.
+ * @return the offset of the next instruction to execute. Usually it is the current offset + 1.
+ * If the current instruction is IF or LOOP, the next instruction is after the IF or LOOP block.
+ * If the current instruction always terminates the program, returns PROGRAM_END.
+ */
+ u32 CompileInstr(u32 offset) {
+ const Instruction instr = {program_code[offset]};
+
+ size_t swizzle_offset = instr.opcode.Value().GetInfo().type == OpCode::Type::MultiplyAdd
+ ? instr.mad.operand_desc_id
+ : instr.common.operand_desc_id;
+ const SwizzlePattern swizzle = {swizzle_data[swizzle_offset]};
+
+ shader.AddLine("// " + std::to_string(offset) + ": " + instr.opcode.Value().GetInfo().name);
+
+ switch (instr.opcode.Value().GetInfo().type) {
+ case OpCode::Type::Arithmetic: {
+ const bool is_inverted =
+ (0 != (instr.opcode.Value().GetInfo().subtype & OpCode::Info::SrcInversed));
+
+ std::string src1 = swizzle.negate_src1 ? "-" : "";
+ src1 += GetSourceRegister(instr.common.GetSrc1(is_inverted),
+ !is_inverted * instr.common.address_register_index);
+ src1 += "." + GetSelectorSrc1(swizzle);
+
+ std::string src2 = swizzle.negate_src2 ? "-" : "";
+ src2 += GetSourceRegister(instr.common.GetSrc2(is_inverted),
+ is_inverted * instr.common.address_register_index);
+ src2 += "." + GetSelectorSrc2(swizzle);
+
+ std::string dest_reg = GetDestRegister(instr.common.dest.Value());
+
+ switch (instr.opcode.Value().EffectiveOpCode()) {
+ case OpCode::Id::ADD: {
+ SetDest(swizzle, dest_reg, src1 + " + " + src2, 4, 4);
+ break;
+ }
+
+ case OpCode::Id::MUL: {
+ if (sanitize_mul) {
+ SetDest(swizzle, dest_reg, "sanitize_mul(" + src1 + ", " + src2 + ")", 4, 4);
+ } else {
+ SetDest(swizzle, dest_reg, src1 + " * " + src2, 4, 4);
+ }
+ break;
+ }
+
+ case OpCode::Id::FLR: {
+ SetDest(swizzle, dest_reg, "floor(" + src1 + ")", 4, 4);
+ break;
+ }
+
+ case OpCode::Id::MAX: {
+ SetDest(swizzle, dest_reg, "max(" + src1 + ", " + src2 + ")", 4, 4);
+ break;
+ }
+
+ case OpCode::Id::MIN: {
+ SetDest(swizzle, dest_reg, "min(" + src1 + ", " + src2 + ")", 4, 4);
+ break;
+ }
+
+ case OpCode::Id::DP3:
+ case OpCode::Id::DP4:
+ case OpCode::Id::DPH:
+ case OpCode::Id::DPHI: {
+ OpCode::Id opcode = instr.opcode.Value().EffectiveOpCode();
+ std::string dot;
+ if (opcode == OpCode::Id::DP3) {
+ if (sanitize_mul) {
+ dot = "dot(vec3(sanitize_mul(" + src1 + ", " + src2 + ")), vec3(1.0))";
+ } else {
+ dot = "dot(vec3(" + src1 + "), vec3(" + src2 + "))";
+ }
+ } else {
+ std::string src1_ = (opcode == OpCode::Id::DPH || opcode == OpCode::Id::DPHI)
+ ? "vec4(" + src1 + ".xyz, 1.0)"
+ : src1;
+ if (sanitize_mul) {
+ dot = "dot(sanitize_mul(" + src1_ + ", " + src2 + "), vec4(1.0))";
+ } else {
+ dot = "dot(" + src1 + ", " + src2 + ")";
+ }
+ }
+
+ SetDest(swizzle, dest_reg, dot, 4, 1);
+ break;
+ }
+
+ case OpCode::Id::RCP: {
+ SetDest(swizzle, dest_reg, "(1.0 / " + src1 + ".x)", 4, 1);
+ break;
+ }
+
+ case OpCode::Id::RSQ: {
+ SetDest(swizzle, dest_reg, "inversesqrt(" + src1 + ".x)", 4, 1);
+ break;
+ }
+
+ case OpCode::Id::MOVA: {
+ SetDest(swizzle, "address_registers", "ivec2(" + src1 + ")", 2, 2);
+ break;
+ }
+
+ case OpCode::Id::MOV: {
+ SetDest(swizzle, dest_reg, src1, 4, 4);
+ break;
+ }
+
+ case OpCode::Id::SGE:
+ case OpCode::Id::SGEI: {
+ SetDest(swizzle, dest_reg, "vec4(greaterThanEqual(" + src1 + "," + src2 + "))", 4,
+ 4);
+ break;
+ }
+
+ case OpCode::Id::SLT:
+ case OpCode::Id::SLTI: {
+ SetDest(swizzle, dest_reg, "vec4(lessThan(" + src1 + "," + src2 + "))", 4, 4);
+ break;
+ }
+
+ case OpCode::Id::CMP: {
+ using CompareOp = Instruction::Common::CompareOpType::Op;
+ const std::map<CompareOp, std::pair<std::string, std::string>> cmp_ops{
+ {CompareOp::Equal, {"==", "equal"}},
+ {CompareOp::NotEqual, {"!=", "notEqual"}},
+ {CompareOp::LessThan, {"<", "lessThan"}},
+ {CompareOp::LessEqual, {"<=", "lessThanEqual"}},
+ {CompareOp::GreaterThan, {">", "greaterThan"}},
+ {CompareOp::GreaterEqual, {">=", "greaterThanEqual"}}};
+
+ const CompareOp op_x = instr.common.compare_op.x.Value();
+ const CompareOp op_y = instr.common.compare_op.y.Value();
+
+ if (cmp_ops.find(op_x) == cmp_ops.end()) {
+ LOG_ERROR(HW_GPU, "Unknown compare mode %x", static_cast<int>(op_x));
+ } else if (cmp_ops.find(op_y) == cmp_ops.end()) {
+ LOG_ERROR(HW_GPU, "Unknown compare mode %x", static_cast<int>(op_y));
+ } else if (op_x != op_y) {
+ shader.AddLine("conditional_code.x = " + src1 + ".x " +
+ cmp_ops.find(op_x)->second.first + " " + src2 + ".x;");
+ shader.AddLine("conditional_code.y = " + src1 + ".y " +
+ cmp_ops.find(op_y)->second.first + " " + src2 + ".y;");
+ } else {
+ shader.AddLine("conditional_code = " + cmp_ops.find(op_x)->second.second +
+ "(vec2(" + src1 + "), vec2(" + src2 + "));");
+ }
+ break;
+ }
+
+ case OpCode::Id::EX2: {
+ SetDest(swizzle, dest_reg, "exp2(" + src1 + ".x)", 4, 1);
+ break;
+ }
+
+ case OpCode::Id::LG2: {
+ SetDest(swizzle, dest_reg, "log2(" + src1 + ".x)", 4, 1);
+ break;
+ }
+
+ default: {
+ LOG_ERROR(HW_GPU, "Unhandled arithmetic instruction: 0x%02x (%s): 0x%08x",
+ (int)instr.opcode.Value().EffectiveOpCode(),
+ instr.opcode.Value().GetInfo().name, instr.hex);
+ throw DecompileFail("Unhandled instruction");
+ break;
+ }
+ }
+
+ break;
+ }
+
+ case OpCode::Type::MultiplyAdd: {
+ if ((instr.opcode.Value().EffectiveOpCode() == OpCode::Id::MAD) ||
+ (instr.opcode.Value().EffectiveOpCode() == OpCode::Id::MADI)) {
+ bool is_inverted = (instr.opcode.Value().EffectiveOpCode() == OpCode::Id::MADI);
+
+ std::string src1 = swizzle.negate_src1 ? "-" : "";
+ src1 += GetSourceRegister(instr.mad.GetSrc1(is_inverted), 0);
+ src1 += "." + GetSelectorSrc1(swizzle);
+
+ std::string src2 = swizzle.negate_src2 ? "-" : "";
+ src2 += GetSourceRegister(instr.mad.GetSrc2(is_inverted),
+ !is_inverted * instr.mad.address_register_index);
+ src2 += "." + GetSelectorSrc2(swizzle);
+
+ std::string src3 = swizzle.negate_src3 ? "-" : "";
+ src3 += GetSourceRegister(instr.mad.GetSrc3(is_inverted),
+ is_inverted * instr.mad.address_register_index);
+ src3 += "." + GetSelectorSrc3(swizzle);
+
+ std::string dest_reg =
+ (instr.mad.dest.Value() < 0x10)
+ ? outputreg_getter(static_cast<u32>(instr.mad.dest.Value().GetIndex()))
+ : (instr.mad.dest.Value() < 0x20)
+ ? "reg_tmp" + std::to_string(instr.mad.dest.Value().GetIndex())
+ : "";
+
+ if (sanitize_mul) {
+ SetDest(swizzle, dest_reg, "sanitize_mul(" + src1 + ", " + src2 + ") + " + src3,
+ 4, 4);
+ } else {
+ SetDest(swizzle, dest_reg, src1 + " * " + src2 + " + " + src3, 4, 4);
+ }
+ } else {
+ LOG_ERROR(HW_GPU, "Unhandled multiply-add instruction: 0x%02x (%s): 0x%08x",
+ (int)instr.opcode.Value().EffectiveOpCode(),
+ instr.opcode.Value().GetInfo().name, instr.hex);
+ throw DecompileFail("Unhandled instruction");
+ }
+ break;
+ }
+
+ default: {
+ switch (instr.opcode.Value()) {
+ case OpCode::Id::END: {
+ shader.AddLine("return true;");
+ offset = PROGRAM_END - 1;
+ break;
+ }
+
+ case OpCode::Id::JMPC:
+ case OpCode::Id::JMPU: {
+ std::string condition;
+ if (instr.opcode.Value() == OpCode::Id::JMPC) {
+ condition = EvaluateCondition(instr.flow_control);
+ } else {
+ bool invert_test = instr.flow_control.num_instructions & 1;
+ condition = (invert_test ? "!" : "") +
+ GetUniformBool(instr.flow_control.bool_uniform_id);
+ }
+
+ shader.AddLine("if (" + condition + ") {");
+ ++shader.scope;
+ shader.AddLine("{ jmp_to = " + std::to_string(instr.flow_control.dest_offset) +
+ "u; break; }");
+
+ --shader.scope;
+ shader.AddLine("}");
+ break;
+ }
+
+ case OpCode::Id::CALL:
+ case OpCode::Id::CALLC:
+ case OpCode::Id::CALLU: {
+ std::string condition;
+ if (instr.opcode.Value() == OpCode::Id::CALLC) {
+ condition = EvaluateCondition(instr.flow_control);
+ } else if (instr.opcode.Value() == OpCode::Id::CALLU) {
+ condition = GetUniformBool(instr.flow_control.bool_uniform_id);
+ }
+
+ shader.AddLine(condition.empty() ? "{" : "if (" + condition + ") {");
+ ++shader.scope;
+
+ auto& call_sub = GetSubroutine(instr.flow_control.dest_offset,
+ instr.flow_control.dest_offset +
+ instr.flow_control.num_instructions);
+
+ CallSubroutine(call_sub);
+ if (instr.opcode.Value() == OpCode::Id::CALL &&
+ call_sub.exit_method == ExitMethod::AlwaysEnd) {
+ offset = PROGRAM_END - 1;
+ }
+
+ --shader.scope;
+ shader.AddLine("}");
+ break;
+ }
+
+ case OpCode::Id::NOP: {
+ break;
+ }
+
+ case OpCode::Id::IFC:
+ case OpCode::Id::IFU: {
+ std::string condition;
+ if (instr.opcode.Value() == OpCode::Id::IFC) {
+ condition = EvaluateCondition(instr.flow_control);
+ } else {
+ condition = GetUniformBool(instr.flow_control.bool_uniform_id);
+ }
+
+ const u32 if_offset = offset + 1;
+ const u32 else_offset = instr.flow_control.dest_offset;
+ const u32 endif_offset =
+ instr.flow_control.dest_offset + instr.flow_control.num_instructions;
+
+ shader.AddLine("if (" + condition + ") {");
+ ++shader.scope;
+
+ auto& if_sub = GetSubroutine(if_offset, else_offset);
+ CallSubroutine(if_sub);
+ offset = else_offset - 1;
+
+ if (instr.flow_control.num_instructions != 0) {
+ --shader.scope;
+ shader.AddLine("} else {");
+ ++shader.scope;
+
+ auto& else_sub = GetSubroutine(else_offset, endif_offset);
+ CallSubroutine(else_sub);
+ offset = endif_offset - 1;
+
+ if (if_sub.exit_method == ExitMethod::AlwaysEnd &&
+ else_sub.exit_method == ExitMethod::AlwaysEnd) {
+ offset = PROGRAM_END - 1;
+ }
+ }
+
+ --shader.scope;
+ shader.AddLine("}");
+ break;
+ }
+
+ case OpCode::Id::LOOP: {
+ std::string int_uniform =
+ "uniforms.i[" + std::to_string(instr.flow_control.int_uniform_id) + "]";
+
+ shader.AddLine("address_registers.z = int(" + int_uniform + ".y);");
+
+ std::string loop_var = "loop" + std::to_string(offset);
+ shader.AddLine("for (uint " + loop_var + " = 0u; " + loop_var +
+ " <= " + int_uniform + ".x; address_registers.z += int(" +
+ int_uniform + ".z), ++" + loop_var + ") {");
+ ++shader.scope;
+
+ auto& loop_sub = GetSubroutine(offset + 1, instr.flow_control.dest_offset + 1);
+ CallSubroutine(loop_sub);
+ offset = instr.flow_control.dest_offset;
+
+ --shader.scope;
+ shader.AddLine("}");
+
+ if (loop_sub.exit_method == ExitMethod::AlwaysEnd) {
+ offset = PROGRAM_END - 1;
+ }
+
+ break;
+ }
+
+ case OpCode::Id::EMIT: {
+ if (is_gs) {
+ shader.AddLine("emit();");
+ }
+ break;
+ }
+
+ case OpCode::Id::SETEMIT: {
+ if (is_gs) {
+ ASSERT(instr.setemit.vertex_id < 3);
+ shader.AddLine("setemit(" + std::to_string(instr.setemit.vertex_id) + "u, " +
+ ((instr.setemit.prim_emit != 0) ? "true" : "false") + ", " +
+ ((instr.setemit.winding != 0) ? "true" : "false") + ");");
+ }
+ break;
+ }
+
+ default: {
+ LOG_ERROR(HW_GPU, "Unhandled instruction: 0x%02x (%s): 0x%08x",
+ (int)instr.opcode.Value().EffectiveOpCode(),
+ instr.opcode.Value().GetInfo().name, instr.hex);
+ throw DecompileFail("Unhandled instruction");
+ break;
+ }
+ }
+
+ break;
+ }
+ }
+ return offset + 1;
+ }
+
+ /**
+ * Compiles a range of instructions from PICA to GLSL.
+ * @param begin the offset of the starting instruction.
+ * @param end the offset where the compilation should stop (exclusive).
+ * @return the offset of the next instruction to compile. PROGRAM_END if the program terminates.
+ */
+ u32 CompileRange(u32 begin, u32 end) {
+ u32 program_counter;
+ for (program_counter = begin; program_counter < (begin > end ? PROGRAM_END : end);) {
+ program_counter = CompileInstr(program_counter);
+ }
+ return program_counter;
+ }
+
+ void Generate() {
+ if (sanitize_mul) {
+ shader.AddLine("vec4 sanitize_mul(vec4 lhs, vec4 rhs) {");
+ ++shader.scope;
+ shader.AddLine("vec4 product = lhs * rhs;");
+ shader.AddLine("return mix(product, mix(mix(vec4(0.0), product, isnan(rhs)), product, "
+ "isnan(lhs)), isnan(product));");
+ --shader.scope;
+ shader.AddLine("}\n");
+ }
+
+ // Add declarations for registers
+ shader.AddLine("bvec2 conditional_code = bvec2(false);");
+ shader.AddLine("ivec3 address_registers = ivec3(0);");
+ for (int i = 0; i < 16; ++i) {
+ shader.AddLine("vec4 reg_tmp" + std::to_string(i) + " = vec4(0.0, 0.0, 0.0, 1.0);");
+ }
+ shader.AddLine("");
+
+ // Add declarations for all subroutines
+ for (const auto& subroutine : subroutines) {
+ shader.AddLine("bool " + subroutine.GetName() + "();");
+ }
+ shader.AddLine("");
+
+ // Add the main entry point
+ shader.AddLine("bool exec_shader() {");
+ ++shader.scope;
+ CallSubroutine(GetSubroutine(main_offset, PROGRAM_END));
+ --shader.scope;
+ shader.AddLine("}\n");
+
+ // Add definitions for all subroutines
+ for (const auto& subroutine : subroutines) {
+ std::set<u32> labels = subroutine.labels;
+
+ shader.AddLine("bool " + subroutine.GetName() + "() {");
+ ++shader.scope;
+
+ if (labels.empty()) {
+ if (CompileRange(subroutine.begin, subroutine.end) != PROGRAM_END) {
+ shader.AddLine("return false;");
+ }
+ } else {
+ labels.insert(subroutine.begin);
+ shader.AddLine("uint jmp_to = " + std::to_string(subroutine.begin) + "u;");
+ shader.AddLine("while (true) {");
+ ++shader.scope;
+
+ shader.AddLine("switch (jmp_to) {");
+
+ for (auto label : labels) {
+ shader.AddLine("case " + std::to_string(label) + "u: {");
+ ++shader.scope;
+
+ auto next_it = labels.lower_bound(label + 1);
+ u32 next_label = next_it == labels.end() ? subroutine.end : *next_it;
+
+ u32 compile_end = CompileRange(label, next_label);
+ if (compile_end > next_label && compile_end != PROGRAM_END) {
+ // This happens only when there is a label inside a IF/LOOP block
+ shader.AddLine("{ jmp_to = " + std::to_string(compile_end) + "u; break; }");
+ labels.emplace(compile_end);
+ }
+
+ --shader.scope;
+ shader.AddLine("}");
+ }
+
+ shader.AddLine("default: return false;");
+ shader.AddLine("}");
+
+ --shader.scope;
+ shader.AddLine("}");
+
+ shader.AddLine("return false;");
+ }
+
+ --shader.scope;
+ shader.AddLine("}\n");
+
+ DEBUG_ASSERT(shader.scope == 0);
+ }
+ }
+
+private:
+ const std::set<Subroutine>& subroutines;
+ const ProgramCode& program_code;
+ const SwizzleData& swizzle_data;
+ const u32 main_offset;
+ const RegGetter& inputreg_getter;
+ const RegGetter& outputreg_getter;
+ const bool sanitize_mul;
+ const bool is_gs;
+
+ ShaderWriter shader;
+};
+
+std::string GetCommonDeclarations() {
+ return R"(
+struct pica_uniforms {
+ bool b[16];
+ uvec4 i[4];
+ vec4 f[96];
+};
+
+bool exec_shader();
+
+)";
+}
+
+boost::optional<std::string> DecompileProgram(const ProgramCode& program_code,
+ const SwizzleData& swizzle_data, u32 main_offset,
+ const RegGetter& inputreg_getter,
+ const RegGetter& outputreg_getter, bool sanitize_mul,
+ bool is_gs) {
+
+ try {
+ auto subroutines = ControlFlowAnalyzer(program_code, main_offset).MoveSubroutines();
+ GLSLGenerator generator(subroutines, program_code, swizzle_data, main_offset,
+ inputreg_getter, outputreg_getter, sanitize_mul, is_gs);
+ return generator.MoveShaderCode();
+ } catch (const DecompileFail& exception) {
+ LOG_ERROR(HW_GPU, "Shader decompilation failed: %s", exception.what());
+ return boost::none;
+ }
+}
+
+} // namespace Decompiler
+} // namespace Shader
+} // namespace Pica
diff --git a/src/video_core/renderer_opengl/gl_shader_decompiler.h b/src/video_core/renderer_opengl/gl_shader_decompiler.h
new file mode 100644
index 000000000..91a71ce13
--- /dev/null
+++ b/src/video_core/renderer_opengl/gl_shader_decompiler.h
@@ -0,0 +1,30 @@
+// Copyright 2017 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <array>
+#include <functional>
+#include <string>
+#include <boost/optional.hpp>
+#include "common/common_types.h"
+#include "video_core/shader/shader.h"
+
+namespace Pica {
+namespace Shader {
+namespace Decompiler {
+
+using ProgramCode = std::array<u32, MAX_PROGRAM_CODE_LENGTH>;
+using SwizzleData = std::array<u32, MAX_SWIZZLE_DATA_LENGTH>;
+using RegGetter = std::function<std::string(u32)>;
+
+std::string GetCommonDeclarations();
+
+boost::optional<std::string> DecompileProgram(const ProgramCode& program_code,
+ const SwizzleData& swizzle_data, u32 main_offset,
+ const RegGetter& inputreg_getter,
+ const RegGetter& outputreg_getter, bool sanitize_mul,
+ bool is_gs);
+
+} // namespace Decompiler
+} // namespace Shader
+} // namespace Pica