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Merge pull request #518 from Subv/incomplete_shaders
GPU: Implemented predicated exit instructions in the shader programs.
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commit
8c99dd055c
@ -115,7 +115,16 @@ private:
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if (const auto opcode = OpCode::Decode(instr)) {
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switch (opcode->GetId()) {
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case OpCode::Id::EXIT: {
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// The EXIT instruction can be predicated, which means that the shader can
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// conditionally end on this instruction. We have to consider the case where the
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// condition is not met and check the exit method of that other basic block.
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using Tegra::Shader::Pred;
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if (instr.pred.pred_index == static_cast<u64>(Pred::UnusedIndex)) {
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return exit_method = ExitMethod::AlwaysEnd;
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} else {
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ExitMethod not_met = Scan(offset + 1, end, labels);
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return exit_method = ParallelExit(ExitMethod::AlwaysEnd, not_met);
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}
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}
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case OpCode::Id::BRA: {
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u32 target = offset + instr.bra.GetBranchTarget();
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@ -1213,9 +1222,6 @@ private:
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default: {
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switch (opcode->GetId()) {
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case OpCode::Id::EXIT: {
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ASSERT_MSG(instr.pred.pred_index == static_cast<u64>(Pred::UnusedIndex),
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"Predicated exits not implemented");
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// Final color output is currently hardcoded to GPR0-3 for fragment shaders
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if (stage == Maxwell3D::Regs::ShaderStage::Fragment) {
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shader.AddLine("color.r = " + regs.GetRegisterAsFloat(0) + ';');
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@ -1225,7 +1231,12 @@ private:
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}
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shader.AddLine("return true;");
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if (instr.pred.pred_index == static_cast<u64>(Pred::UnusedIndex)) {
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// If this is an unconditional exit then just end processing here, otherwise we
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// have to account for the possibility of the condition not being met, so
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// continue processing the next instruction.
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offset = PROGRAM_END - 1;
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}
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break;
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}
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case OpCode::Id::KIL: {
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