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-rw-r--r--src/video_core/shader/shader_interpreter.cpp508
1 files changed, 508 insertions, 0 deletions
diff --git a/src/video_core/shader/shader_interpreter.cpp b/src/video_core/shader/shader_interpreter.cpp
new file mode 100644
index 000000000..c8489f920
--- /dev/null
+++ b/src/video_core/shader/shader_interpreter.cpp
@@ -0,0 +1,508 @@
+// Copyright 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <common/file_util.h>
+
+#include <nihstro/shader_bytecode.h>
+
+#include "video_core/pica.h"
+
+#include "shader.h"
+#include "shader_interpreter.h"
+
+using nihstro::OpCode;
+using nihstro::Instruction;
+using nihstro::RegisterType;
+using nihstro::SourceRegister;
+using nihstro::SwizzlePattern;
+
+namespace Pica {
+
+namespace Shader {
+
+void RunInterpreter(UnitState& state) {
+ const auto& uniforms = g_state.vs.uniforms;
+ const auto& swizzle_data = g_state.vs.swizzle_data;
+ const auto& program_code = g_state.vs.program_code;
+
+ // Placeholder for invalid inputs
+ static float24 dummy_vec4_float24[4];
+
+ while (true) {
+ if (!state.call_stack.empty()) {
+ auto& top = state.call_stack.back();
+ if (state.program_counter == top.final_address) {
+ state.address_registers[2] += top.loop_increment;
+
+ if (top.repeat_counter-- == 0) {
+ state.program_counter = top.return_address;
+ state.call_stack.pop_back();
+ } else {
+ state.program_counter = top.loop_address;
+ }
+
+ // TODO: Is "trying again" accurate to hardware?
+ continue;
+ }
+ }
+
+ bool exit_loop = false;
+ const Instruction instr = { program_code[state.program_counter] };
+ const SwizzlePattern swizzle = { swizzle_data[instr.common.operand_desc_id] };
+
+ static auto call = [](UnitState& state, u32 offset, u32 num_instructions,
+ u32 return_offset, u8 repeat_count, u8 loop_increment) {
+ state.program_counter = offset - 1; // -1 to make sure when incrementing the PC we end up at the correct offset
+ ASSERT(state.call_stack.size() < state.call_stack.capacity());
+ state.call_stack.push_back({ offset + num_instructions, return_offset, repeat_count, loop_increment, offset });
+ };
+ state.debug.max_offset = std::max<u32>(state.debug.max_offset, 1 + state.program_counter);
+
+ auto LookupSourceRegister = [&](const SourceRegister& source_reg) -> const float24* {
+ switch (source_reg.GetRegisterType()) {
+ case RegisterType::Input:
+ return &state.registers.input[source_reg.GetIndex()].x;
+
+ case RegisterType::Temporary:
+ return &state.registers.temporary[source_reg.GetIndex()].x;
+
+ case RegisterType::FloatUniform:
+ return &uniforms.f[source_reg.GetIndex()].x;
+
+ default:
+ return dummy_vec4_float24;
+ }
+ };
+
+ switch (instr.opcode.Value().GetInfo().type) {
+ case OpCode::Type::Arithmetic:
+ {
+ const bool is_inverted = (0 != (instr.opcode.Value().GetInfo().subtype & OpCode::Info::SrcInversed));
+
+ const int address_offset = (instr.common.address_register_index == 0)
+ ? 0 : state.address_registers[instr.common.address_register_index - 1];
+
+ const float24* src1_ = LookupSourceRegister(instr.common.GetSrc1(is_inverted) + (!is_inverted * address_offset));
+ const float24* src2_ = LookupSourceRegister(instr.common.GetSrc2(is_inverted) + ( is_inverted * address_offset));
+
+ const bool negate_src1 = ((bool)swizzle.negate_src1 != false);
+ const bool negate_src2 = ((bool)swizzle.negate_src2 != false);
+
+ float24 src1[4] = {
+ src1_[(int)swizzle.GetSelectorSrc1(0)],
+ src1_[(int)swizzle.GetSelectorSrc1(1)],
+ src1_[(int)swizzle.GetSelectorSrc1(2)],
+ src1_[(int)swizzle.GetSelectorSrc1(3)],
+ };
+ if (negate_src1) {
+ src1[0] = src1[0] * float24::FromFloat32(-1);
+ src1[1] = src1[1] * float24::FromFloat32(-1);
+ src1[2] = src1[2] * float24::FromFloat32(-1);
+ src1[3] = src1[3] * float24::FromFloat32(-1);
+ }
+ float24 src2[4] = {
+ src2_[(int)swizzle.GetSelectorSrc2(0)],
+ src2_[(int)swizzle.GetSelectorSrc2(1)],
+ src2_[(int)swizzle.GetSelectorSrc2(2)],
+ src2_[(int)swizzle.GetSelectorSrc2(3)],
+ };
+ if (negate_src2) {
+ src2[0] = src2[0] * float24::FromFloat32(-1);
+ src2[1] = src2[1] * float24::FromFloat32(-1);
+ src2[2] = src2[2] * float24::FromFloat32(-1);
+ src2[3] = src2[3] * float24::FromFloat32(-1);
+ }
+
+ float24* dest = (instr.common.dest.Value() < 0x10) ? &state.registers.output[instr.common.dest.Value().GetIndex()][0]
+ : (instr.common.dest.Value() < 0x20) ? &state.registers.temporary[instr.common.dest.Value().GetIndex()][0]
+ : dummy_vec4_float24;
+
+ state.debug.max_opdesc_id = std::max<u32>(state.debug.max_opdesc_id, 1+instr.common.operand_desc_id);
+
+ switch (instr.opcode.Value().EffectiveOpCode()) {
+ case OpCode::Id::ADD:
+ {
+ for (int i = 0; i < 4; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ dest[i] = src1[i] + src2[i];
+ }
+
+ break;
+ }
+
+ case OpCode::Id::MUL:
+ {
+ for (int i = 0; i < 4; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ dest[i] = src1[i] * src2[i];
+ }
+
+ break;
+ }
+
+ case OpCode::Id::FLR:
+ for (int i = 0; i < 4; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ dest[i] = float24::FromFloat32(std::floor(src1[i].ToFloat32()));
+ }
+ break;
+
+ case OpCode::Id::MAX:
+ for (int i = 0; i < 4; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ dest[i] = std::max(src1[i], src2[i]);
+ }
+ break;
+
+ case OpCode::Id::MIN:
+ for (int i = 0; i < 4; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ dest[i] = std::min(src1[i], src2[i]);
+ }
+ break;
+
+ case OpCode::Id::DP3:
+ case OpCode::Id::DP4:
+ {
+ float24 dot = float24::FromFloat32(0.f);
+ int num_components = (instr.opcode.Value() == OpCode::Id::DP3) ? 3 : 4;
+ for (int i = 0; i < num_components; ++i)
+ dot = dot + src1[i] * src2[i];
+
+ for (int i = 0; i < 4; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ dest[i] = dot;
+ }
+ break;
+ }
+
+ // Reciprocal
+ case OpCode::Id::RCP:
+ {
+ for (int i = 0; i < 4; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ // TODO: Be stable against division by zero!
+ // TODO: I think this might be wrong... we should only use one component here
+ dest[i] = float24::FromFloat32(1.0f / src1[i].ToFloat32());
+ }
+
+ break;
+ }
+
+ // Reciprocal Square Root
+ case OpCode::Id::RSQ:
+ {
+ for (int i = 0; i < 4; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ // TODO: Be stable against division by zero!
+ // TODO: I think this might be wrong... we should only use one component here
+ dest[i] = float24::FromFloat32(1.0f / sqrt(src1[i].ToFloat32()));
+ }
+
+ break;
+ }
+
+ case OpCode::Id::MOVA:
+ {
+ for (int i = 0; i < 2; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ // TODO: Figure out how the rounding is done on hardware
+ state.address_registers[i] = static_cast<s32>(src1[i].ToFloat32());
+ }
+
+ break;
+ }
+
+ case OpCode::Id::MOV:
+ {
+ for (int i = 0; i < 4; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ dest[i] = src1[i];
+ }
+ break;
+ }
+
+ case OpCode::Id::SLT:
+ case OpCode::Id::SLTI:
+ for (int i = 0; i < 4; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ dest[i] = (src1[i] < src2[i]) ? float24::FromFloat32(1.0f) : float24::FromFloat32(0.0f);
+ }
+ break;
+
+ case OpCode::Id::CMP:
+ for (int i = 0; i < 2; ++i) {
+ // TODO: Can you restrict to one compare via dest masking?
+
+ auto compare_op = instr.common.compare_op;
+ auto op = (i == 0) ? compare_op.x.Value() : compare_op.y.Value();
+
+ switch (op) {
+ case compare_op.Equal:
+ state.conditional_code[i] = (src1[i] == src2[i]);
+ break;
+
+ case compare_op.NotEqual:
+ state.conditional_code[i] = (src1[i] != src2[i]);
+ break;
+
+ case compare_op.LessThan:
+ state.conditional_code[i] = (src1[i] < src2[i]);
+ break;
+
+ case compare_op.LessEqual:
+ state.conditional_code[i] = (src1[i] <= src2[i]);
+ break;
+
+ case compare_op.GreaterThan:
+ state.conditional_code[i] = (src1[i] > src2[i]);
+ break;
+
+ case compare_op.GreaterEqual:
+ state.conditional_code[i] = (src1[i] >= src2[i]);
+ break;
+
+ default:
+ LOG_ERROR(HW_GPU, "Unknown compare mode %x", static_cast<int>(op));
+ break;
+ }
+ }
+ 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);
+ DEBUG_ASSERT(false);
+ break;
+ }
+
+ break;
+ }
+
+ case OpCode::Type::MultiplyAdd:
+ {
+ if ((instr.opcode.Value().EffectiveOpCode() == OpCode::Id::MAD) ||
+ (instr.opcode.Value().EffectiveOpCode() == OpCode::Id::MADI)) {
+ const SwizzlePattern& swizzle = *(SwizzlePattern*)&swizzle_data[instr.mad.operand_desc_id];
+
+ bool is_inverted = (instr.opcode.Value().EffectiveOpCode() == OpCode::Id::MADI);
+
+ const float24* src1_ = LookupSourceRegister(instr.mad.GetSrc1(is_inverted));
+ const float24* src2_ = LookupSourceRegister(instr.mad.GetSrc2(is_inverted));
+ const float24* src3_ = LookupSourceRegister(instr.mad.GetSrc3(is_inverted));
+
+ const bool negate_src1 = ((bool)swizzle.negate_src1 != false);
+ const bool negate_src2 = ((bool)swizzle.negate_src2 != false);
+ const bool negate_src3 = ((bool)swizzle.negate_src3 != false);
+
+ float24 src1[4] = {
+ src1_[(int)swizzle.GetSelectorSrc1(0)],
+ src1_[(int)swizzle.GetSelectorSrc1(1)],
+ src1_[(int)swizzle.GetSelectorSrc1(2)],
+ src1_[(int)swizzle.GetSelectorSrc1(3)],
+ };
+ if (negate_src1) {
+ src1[0] = src1[0] * float24::FromFloat32(-1);
+ src1[1] = src1[1] * float24::FromFloat32(-1);
+ src1[2] = src1[2] * float24::FromFloat32(-1);
+ src1[3] = src1[3] * float24::FromFloat32(-1);
+ }
+ float24 src2[4] = {
+ src2_[(int)swizzle.GetSelectorSrc2(0)],
+ src2_[(int)swizzle.GetSelectorSrc2(1)],
+ src2_[(int)swizzle.GetSelectorSrc2(2)],
+ src2_[(int)swizzle.GetSelectorSrc2(3)],
+ };
+ if (negate_src2) {
+ src2[0] = src2[0] * float24::FromFloat32(-1);
+ src2[1] = src2[1] * float24::FromFloat32(-1);
+ src2[2] = src2[2] * float24::FromFloat32(-1);
+ src2[3] = src2[3] * float24::FromFloat32(-1);
+ }
+ float24 src3[4] = {
+ src3_[(int)swizzle.GetSelectorSrc3(0)],
+ src3_[(int)swizzle.GetSelectorSrc3(1)],
+ src3_[(int)swizzle.GetSelectorSrc3(2)],
+ src3_[(int)swizzle.GetSelectorSrc3(3)],
+ };
+ if (negate_src3) {
+ src3[0] = src3[0] * float24::FromFloat32(-1);
+ src3[1] = src3[1] * float24::FromFloat32(-1);
+ src3[2] = src3[2] * float24::FromFloat32(-1);
+ src3[3] = src3[3] * float24::FromFloat32(-1);
+ }
+
+ float24* dest = (instr.mad.dest.Value() < 0x10) ? &state.registers.output[instr.mad.dest.Value().GetIndex()][0]
+ : (instr.mad.dest.Value() < 0x20) ? &state.registers.temporary[instr.mad.dest.Value().GetIndex()][0]
+ : dummy_vec4_float24;
+
+ for (int i = 0; i < 4; ++i) {
+ if (!swizzle.DestComponentEnabled(i))
+ continue;
+
+ dest[i] = src1[i] * src2[i] + src3[i];
+ }
+ } 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);
+ }
+ break;
+ }
+
+ default:
+ {
+ static auto evaluate_condition = [](const UnitState& state, bool refx, bool refy, Instruction::FlowControlType flow_control) {
+ bool results[2] = { refx == state.conditional_code[0],
+ refy == state.conditional_code[1] };
+
+ switch (flow_control.op) {
+ case flow_control.Or:
+ return results[0] || results[1];
+
+ case flow_control.And:
+ return results[0] && results[1];
+
+ case flow_control.JustX:
+ return results[0];
+
+ case flow_control.JustY:
+ return results[1];
+ }
+ };
+
+ // Handle each instruction on its own
+ switch (instr.opcode.Value()) {
+ case OpCode::Id::END:
+ exit_loop = true;
+ break;
+
+ case OpCode::Id::JMPC:
+ if (evaluate_condition(state, instr.flow_control.refx, instr.flow_control.refy, instr.flow_control)) {
+ state.program_counter = instr.flow_control.dest_offset - 1;
+ }
+ break;
+
+ case OpCode::Id::JMPU:
+ if (uniforms.b[instr.flow_control.bool_uniform_id]) {
+ state.program_counter = instr.flow_control.dest_offset - 1;
+ }
+ break;
+
+ case OpCode::Id::CALL:
+ call(state,
+ instr.flow_control.dest_offset,
+ instr.flow_control.num_instructions,
+ state.program_counter + 1, 0, 0);
+ break;
+
+ case OpCode::Id::CALLU:
+ if (uniforms.b[instr.flow_control.bool_uniform_id]) {
+ call(state,
+ instr.flow_control.dest_offset,
+ instr.flow_control.num_instructions,
+ state.program_counter + 1, 0, 0);
+ }
+ break;
+
+ case OpCode::Id::CALLC:
+ if (evaluate_condition(state, instr.flow_control.refx, instr.flow_control.refy, instr.flow_control)) {
+ call(state,
+ instr.flow_control.dest_offset,
+ instr.flow_control.num_instructions,
+ state.program_counter + 1, 0, 0);
+ }
+ break;
+
+ case OpCode::Id::NOP:
+ break;
+
+ case OpCode::Id::IFU:
+ if (uniforms.b[instr.flow_control.bool_uniform_id]) {
+ call(state,
+ state.program_counter + 1,
+ instr.flow_control.dest_offset - state.program_counter - 1,
+ instr.flow_control.dest_offset + instr.flow_control.num_instructions, 0, 0);
+ } else {
+ call(state,
+ instr.flow_control.dest_offset,
+ instr.flow_control.num_instructions,
+ instr.flow_control.dest_offset + instr.flow_control.num_instructions, 0, 0);
+ }
+
+ break;
+
+ case OpCode::Id::IFC:
+ {
+ // TODO: Do we need to consider swizzlers here?
+
+ if (evaluate_condition(state, instr.flow_control.refx, instr.flow_control.refy, instr.flow_control)) {
+ call(state,
+ state.program_counter + 1,
+ instr.flow_control.dest_offset - state.program_counter - 1,
+ instr.flow_control.dest_offset + instr.flow_control.num_instructions, 0, 0);
+ } else {
+ call(state,
+ instr.flow_control.dest_offset,
+ instr.flow_control.num_instructions,
+ instr.flow_control.dest_offset + instr.flow_control.num_instructions, 0, 0);
+ }
+
+ break;
+ }
+
+ case OpCode::Id::LOOP:
+ {
+ state.address_registers[2] = uniforms.i[instr.flow_control.int_uniform_id].y;
+
+ call(state,
+ state.program_counter + 1,
+ instr.flow_control.dest_offset - state.program_counter + 1,
+ instr.flow_control.dest_offset + 1,
+ uniforms.i[instr.flow_control.int_uniform_id].x,
+ uniforms.i[instr.flow_control.int_uniform_id].z);
+ 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);
+ break;
+ }
+
+ break;
+ }
+ }
+
+ ++state.program_counter;
+
+ if (exit_loop)
+ break;
+ }
+}
+
+} // namespace
+
+} // namespace
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