From 67618a2c55e0b6860bbb083962cdd28a543bf82a Mon Sep 17 00:00:00 2001 From: Tony Wasserka Date: Fri, 12 Dec 2014 22:50:09 +0100 Subject: Pica/VertexShader: Add support for MOVA, CMP and IFC. --- src/video_core/vertex_shader.cpp | 137 +++++++++++++++++++++++++++++++++++++-- 1 file changed, 130 insertions(+), 7 deletions(-) (limited to 'src/video_core/vertex_shader.cpp') diff --git a/src/video_core/vertex_shader.cpp b/src/video_core/vertex_shader.cpp index 33a862b7..5d9203c8 100644 --- a/src/video_core/vertex_shader.cpp +++ b/src/video_core/vertex_shader.cpp @@ -59,6 +59,8 @@ const std::array& GetSwizzlePatterns() return swizzle_data; } +// TODO: Is there actually a limit on hardware? +const int if_stack_size = 8; struct VertexShaderState { u32* program_counter; @@ -67,7 +69,11 @@ struct VertexShaderState { float24* output_register_table[7*4]; Math::Vec4 temporary_registers[16]; - bool status_registers[2]; + bool conditional_code[2]; + + // Two Address registers and one loop counter + // TODO: How many bits do these actually have? + s32 address_registers[3]; enum { INVALID_ADDRESS = 0xFFFFFFFF @@ -75,6 +81,12 @@ struct VertexShaderState { u32 call_stack[8]; // TODO: What is the maximal call stack depth? u32* call_stack_pointer; + struct IfStackElement { + u32 else_addr; + u32 else_instructions; + } if_stack[if_stack_size]; + IfStackElement* if_stack_pointer; + struct { u32 max_offset; // maximum program counter ever reached u32 max_opdesc_id; // maximum swizzle pattern index ever used @@ -107,11 +119,20 @@ static void ProcessShaderCode(VertexShaderState& state) { case Instruction::OpCodeType::Arithmetic: { bool is_inverted = 0 != (instr.opcode.GetInfo().subtype & Instruction::OpCodeInfo::SrcInversed); - const float24* src1_ = LookupSourceRegister(instr.common.GetSrc1(is_inverted)); + if (is_inverted) { + // We don't really support this properly and/or reliably + LOG_ERROR(HW_GPU, "Bad condition..."); + exit(0); + } + + 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) + address_offset); const float24* src2_ = LookupSourceRegister(instr.common.GetSrc2(is_inverted)); - const bool negate_src1 = (swizzle.negate_src1 != 0); - const bool negate_src2 = (swizzle.negate_src2 != 0); + const bool negate_src1 = (swizzle.negate_src1 != false); + const bool negate_src2 = (swizzle.negate_src2 != false); float24 src1[4] = { src1_[(int)swizzle.GetSelectorSrc1(0)], @@ -217,6 +238,19 @@ static void ProcessShaderCode(VertexShaderState& state) { break; } + case Instruction::OpCode::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(src1[i].ToFloat32()); + } + + break; + } + case Instruction::OpCode::MOV: { for (int i = 0; i < 4; ++i) { @@ -228,16 +262,56 @@ static void ProcessShaderCode(VertexShaderState& state) { break; } + case Instruction::OpCode::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(op)); + break; + } + } + break; + default: LOG_ERROR(HW_GPU, "Unhandled arithmetic instruction: 0x%02x (%s): 0x%08x", (int)instr.opcode.Value(), instr.opcode.GetInfo().name, instr.hex); + _dbg_assert_(HW_GPU, 0); break; } break; } default: - // Process instruction explicitly + // Handle each instruction on its own switch (instr.opcode) { // NOP is currently used as a heuristic for leaving from a function. // TODO: This is completely incorrect. @@ -265,6 +339,44 @@ static void ProcessShaderCode(VertexShaderState& state) { // TODO break; + case Instruction::OpCode::IFC: + { + // TODO: Do we need to consider swizzlers here? + + auto flow_control = instr.flow_control; + bool results[3] = { flow_control.refx == state.conditional_code[0], + flow_control.refy == state.conditional_code[1] }; + + switch (flow_control.op) { + case flow_control.Or: + results[2] = results[0] || results[1]; + break; + + case flow_control.And: + results[2] = results[0] && results[1]; + break; + + case flow_control.JustX: + results[2] = results[0]; + break; + + case flow_control.JustY: + results[2] = results[1]; + break; + } + + if (results[2]) { + ++state.if_stack_pointer; + + state.if_stack_pointer->else_addr = instr.flow_control.dest_offset; + state.if_stack_pointer->else_instructions = instr.flow_control.num_instructions; + } else { + state.program_counter = &shader_memory[instr.flow_control.dest_offset] - 1; + } + + break; + } + default: LOG_ERROR(HW_GPU, "Unhandled instruction: 0x%02x (%s): 0x%08x", (int)instr.opcode.Value(), instr.opcode.GetInfo().name, instr.hex); @@ -277,6 +389,13 @@ static void ProcessShaderCode(VertexShaderState& state) { if (increment_pc) ++state.program_counter; + if (state.if_stack_pointer >= &state.if_stack[0]) { + if (state.program_counter - shader_memory.data() == state.if_stack_pointer->else_addr) { + state.program_counter += state.if_stack_pointer->else_instructions; + state.if_stack_pointer--; + } + } + if (exit_loop) break; } @@ -326,11 +445,15 @@ OutputVertex RunShader(const InputVertex& input, int num_attributes) state.output_register_table[4*i+comp] = ((float24*)&ret) + semantics[comp]; } - state.status_registers[0] = false; - state.status_registers[1] = false; + state.conditional_code[0] = false; + state.conditional_code[1] = false; boost::fill(state.call_stack, VertexShaderState::INVALID_ADDRESS); state.call_stack_pointer = &state.call_stack[0]; + std::fill(state.if_stack, state.if_stack + sizeof(state.if_stack) / sizeof(state.if_stack[0]), + VertexShaderState::IfStackElement{VertexShaderState::INVALID_ADDRESS, VertexShaderState::INVALID_ADDRESS}); + state.if_stack_pointer = state.if_stack - 1; // Meh. TODO: Make this less ugly + ProcessShaderCode(state); DebugUtils::DumpShader(shader_memory.data(), state.debug.max_offset, swizzle_data.data(), state.debug.max_opdesc_id, registers.vs_main_offset, -- cgit v1.2.3