1 files changed, 217 insertions, 0 deletions
diff --git a/src/shader_recompiler/backend/glsl/emit_glsl_warp.cpp b/src/shader_recompiler/backend/glsl/emit_glsl_warp.cpp
new file mode 100644
index 000000000..a982dd8a2
--- /dev/null
+++ b/src/shader_recompiler/backend/glsl/emit_glsl_warp.cpp
@@ -0,0 +1,217 @@
+// Copyright 2021 yuzu Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include <string_view>
+
+#include "shader_recompiler/backend/glsl/emit_context.h"
+#include "shader_recompiler/backend/glsl/emit_glsl_instructions.h"
+#include "shader_recompiler/frontend/ir/value.h"
+#include "shader_recompiler/profile.h"
+
+namespace Shader::Backend::GLSL {
+namespace {
+void SetInBoundsFlag(EmitContext& ctx, IR::Inst& inst) {
+    IR::Inst* const in_bounds{inst.GetAssociatedPseudoOperation(IR::Opcode::GetInBoundsFromOp)};
+    if (!in_bounds) {
+        return;
+    }
+    ctx.AddU1("{}=shfl_in_bounds;", *in_bounds);
+    in_bounds->Invalidate();
+}
+
+std::string ComputeMinThreadId(std::string_view thread_id, std::string_view segmentation_mask) {
+    return fmt::format("({}&{})", thread_id, segmentation_mask);
+}
+
+std::string ComputeMaxThreadId(std::string_view min_thread_id, std::string_view clamp,
+                               std::string_view not_seg_mask) {
+    return fmt::format("({})|({}&{})", min_thread_id, clamp, not_seg_mask);
+}
+
+std::string GetMaxThreadId(std::string_view thread_id, std::string_view clamp,
+                           std::string_view segmentation_mask) {
+    const auto not_seg_mask{fmt::format("(~{})", segmentation_mask)};
+    const auto min_thread_id{ComputeMinThreadId(thread_id, segmentation_mask)};
+    return ComputeMaxThreadId(min_thread_id, clamp, not_seg_mask);
+}
+
+void UseShuffleNv(EmitContext& ctx, IR::Inst& inst, std::string_view shfl_op,
+                  std::string_view value, std::string_view index,
+                  [[maybe_unused]] std::string_view clamp, std::string_view segmentation_mask) {
+    const auto width{fmt::format("32u>>(bitCount({}&31u))", segmentation_mask)};
+    ctx.AddU32("{}={}({},{},{},shfl_in_bounds);", inst, shfl_op, value, index, width);
+    SetInBoundsFlag(ctx, inst);
+}
+} // Anonymous namespace
+
+void EmitLaneId(EmitContext& ctx, IR::Inst& inst) {
+    ctx.AddU32("{}=gl_SubGroupInvocationARB&31u;", inst);
+}
+
+void EmitVoteAll(EmitContext& ctx, IR::Inst& inst, std::string_view pred) {
+    if (!ctx.profile.warp_size_potentially_larger_than_guest) {
+        ctx.AddU1("{}=allInvocationsEqualARB({});", inst, pred);
+    } else {
+        const auto active_mask{fmt::format("uvec2(ballotARB(true))[gl_SubGroupInvocationARB]")};
+        const auto ballot{fmt::format("uvec2(ballotARB({}))[gl_SubGroupInvocationARB]", pred)};
+        ctx.AddU1("{}=({}&{})=={};", inst, ballot, active_mask, active_mask);
+    }
+}
+
+void EmitVoteAny(EmitContext& ctx, IR::Inst& inst, std::string_view pred) {
+    if (!ctx.profile.warp_size_potentially_larger_than_guest) {
+        ctx.AddU1("{}=anyInvocationARB({});", inst, pred);
+    } else {
+        const auto active_mask{fmt::format("uvec2(ballotARB(true))[gl_SubGroupInvocationARB]")};
+        const auto ballot{fmt::format("uvec2(ballotARB({}))[gl_SubGroupInvocationARB]", pred)};
+        ctx.AddU1("{}=({}&{})!=0u;", inst, ballot, active_mask, active_mask);
+    }
+}
+
+void EmitVoteEqual(EmitContext& ctx, IR::Inst& inst, std::string_view pred) {
+    if (!ctx.profile.warp_size_potentially_larger_than_guest) {
+        ctx.AddU1("{}=allInvocationsEqualARB({});", inst, pred);
+    } else {
+        const auto active_mask{fmt::format("uvec2(ballotARB(true))[gl_SubGroupInvocationARB]")};
+        const auto ballot{fmt::format("uvec2(ballotARB({}))[gl_SubGroupInvocationARB]", pred)};
+        const auto value{fmt::format("({}^{})", ballot, active_mask)};
+        ctx.AddU1("{}=({}==0)||({}=={});", inst, value, value, active_mask);
+    }
+}
+
+void EmitSubgroupBallot(EmitContext& ctx, IR::Inst& inst, std::string_view pred) {
+    if (!ctx.profile.warp_size_potentially_larger_than_guest) {
+        ctx.AddU32("{}=uvec2(ballotARB({})).x;", inst, pred);
+    } else {
+        ctx.AddU32("{}=uvec2(ballotARB({}))[gl_SubGroupInvocationARB];", inst, pred);
+    }
+}
+
+void EmitSubgroupEqMask(EmitContext& ctx, IR::Inst& inst) {
+    ctx.AddU32("{}=uint(gl_SubGroupEqMaskARB.x);", inst);
+}
+
+void EmitSubgroupLtMask(EmitContext& ctx, IR::Inst& inst) {
+    ctx.AddU32("{}=uint(gl_SubGroupLtMaskARB.x);", inst);
+}
+
+void EmitSubgroupLeMask(EmitContext& ctx, IR::Inst& inst) {
+    ctx.AddU32("{}=uint(gl_SubGroupLeMaskARB.x);", inst);
+}
+
+void EmitSubgroupGtMask(EmitContext& ctx, IR::Inst& inst) {
+    ctx.AddU32("{}=uint(gl_SubGroupGtMaskARB.x);", inst);
+}
+
+void EmitSubgroupGeMask(EmitContext& ctx, IR::Inst& inst) {
+    ctx.AddU32("{}=uint(gl_SubGroupGeMaskARB.x);", inst);
+}
+
+void EmitShuffleIndex(EmitContext& ctx, IR::Inst& inst, std::string_view value,
+                      std::string_view index, std::string_view clamp,
+                      std::string_view segmentation_mask) {
+    if (ctx.profile.support_gl_warp_intrinsics) {
+        UseShuffleNv(ctx, inst, "shuffleNV", value, index, clamp, segmentation_mask);
+        return;
+    }
+    const auto not_seg_mask{fmt::format("(~{})", segmentation_mask)};
+    const auto thread_id{"gl_SubGroupInvocationARB"};
+    const auto min_thread_id{ComputeMinThreadId(thread_id, segmentation_mask)};
+    const auto max_thread_id{ComputeMaxThreadId(min_thread_id, clamp, not_seg_mask)};
+
+    const auto lhs{fmt::format("({}&{})", index, not_seg_mask)};
+    const auto src_thread_id{fmt::format("({})|({})", lhs, min_thread_id)};
+    ctx.Add("shfl_in_bounds=int({})<=int({});", src_thread_id, max_thread_id);
+    SetInBoundsFlag(ctx, inst);
+    ctx.AddU32("{}=shfl_in_bounds?readInvocationARB({},{}):{};", inst, value, src_thread_id, value);
+}
+
+void EmitShuffleUp(EmitContext& ctx, IR::Inst& inst, std::string_view value, std::string_view index,
+                   std::string_view clamp, std::string_view segmentation_mask) {
+    if (ctx.profile.support_gl_warp_intrinsics) {
+        UseShuffleNv(ctx, inst, "shuffleUpNV", value, index, clamp, segmentation_mask);
+        return;
+    }
+    const auto thread_id{"gl_SubGroupInvocationARB"};
+    const auto max_thread_id{GetMaxThreadId(thread_id, clamp, segmentation_mask)};
+    const auto src_thread_id{fmt::format("({}-{})", thread_id, index)};
+    ctx.Add("shfl_in_bounds=int({})>=int({});", src_thread_id, max_thread_id);
+    SetInBoundsFlag(ctx, inst);
+    ctx.AddU32("{}=shfl_in_bounds?readInvocationARB({},{}):{};", inst, value, src_thread_id, value);
+}
+
+void EmitShuffleDown(EmitContext& ctx, IR::Inst& inst, std::string_view value,
+                     std::string_view index, std::string_view clamp,
+                     std::string_view segmentation_mask) {
+    if (ctx.profile.support_gl_warp_intrinsics) {
+        UseShuffleNv(ctx, inst, "shuffleDownNV", value, index, clamp, segmentation_mask);
+        return;
+    }
+    const auto thread_id{"gl_SubGroupInvocationARB"};
+    const auto max_thread_id{GetMaxThreadId(thread_id, clamp, segmentation_mask)};
+    const auto src_thread_id{fmt::format("({}+{})", thread_id, index)};
+    ctx.Add("shfl_in_bounds=int({})<=int({});", src_thread_id, max_thread_id);
+    SetInBoundsFlag(ctx, inst);
+    ctx.AddU32("{}=shfl_in_bounds?readInvocationARB({},{}):{};", inst, value, src_thread_id, value);
+}
+
+void EmitShuffleButterfly(EmitContext& ctx, IR::Inst& inst, std::string_view value,
+                          std::string_view index, std::string_view clamp,
+                          std::string_view segmentation_mask) {
+    if (ctx.profile.support_gl_warp_intrinsics) {
+        UseShuffleNv(ctx, inst, "shuffleXorNV", value, index, clamp, segmentation_mask);
+        return;
+    }
+    const auto thread_id{"gl_SubGroupInvocationARB"};
+    const auto max_thread_id{GetMaxThreadId(thread_id, clamp, segmentation_mask)};
+    const auto src_thread_id{fmt::format("({}^{})", thread_id, index)};
+    ctx.Add("shfl_in_bounds=int({})<=int({});", src_thread_id, max_thread_id);
+    SetInBoundsFlag(ctx, inst);
+    ctx.AddU32("{}=shfl_in_bounds?readInvocationARB({},{}):{};", inst, value, src_thread_id, value);
+}
+
+void EmitFSwizzleAdd(EmitContext& ctx, IR::Inst& inst, std::string_view op_a, std::string_view op_b,
+                     std::string_view swizzle) {
+    const auto mask{fmt::format("({}>>((gl_SubGroupInvocationARB&3)<<1))&3", swizzle)};
+    const std::string modifier_a = fmt::format("FSWZ_A[{}]", mask);
+    const std::string modifier_b = fmt::format("FSWZ_B[{}]", mask);
+    ctx.AddF32("{}=({}*{})+({}*{});", inst, op_a, modifier_a, op_b, modifier_b);
+}
+
+void EmitDPdxFine(EmitContext& ctx, IR::Inst& inst, std::string_view op_a) {
+    if (ctx.profile.support_gl_derivative_control) {
+        ctx.AddF32("{}=dFdxFine({});", inst, op_a);
+    } else {
+        LOG_WARNING(Shader_GLSL, "Device does not support dFdxFine, fallback to dFdx");
+        ctx.AddF32("{}=dFdx({});", inst, op_a);
+    }
+}
+
+void EmitDPdyFine(EmitContext& ctx, IR::Inst& inst, std::string_view op_a) {
+    if (ctx.profile.support_gl_derivative_control) {
+        ctx.AddF32("{}=dFdyFine({});", inst, op_a);
+    } else {
+        LOG_WARNING(Shader_GLSL, "Device does not support dFdyFine, fallback to dFdy");
+        ctx.AddF32("{}=dFdy({});", inst, op_a);
+    }
+}
+
+void EmitDPdxCoarse(EmitContext& ctx, IR::Inst& inst, std::string_view op_a) {
+    if (ctx.profile.support_gl_derivative_control) {
+        ctx.AddF32("{}=dFdxCoarse({});", inst, op_a);
+    } else {
+        LOG_WARNING(Shader_GLSL, "Device does not support dFdxCoarse, fallback to dFdx");
+        ctx.AddF32("{}=dFdx({});", inst, op_a);
+    }
+}
+
+void EmitDPdyCoarse(EmitContext& ctx, IR::Inst& inst, std::string_view op_a) {
+    if (ctx.profile.support_gl_derivative_control) {
+        ctx.AddF32("{}=dFdyCoarse({});", inst, op_a);
+    } else {
+        LOG_WARNING(Shader_GLSL, "Device does not support dFdyCoarse, fallback to dFdy");
+        ctx.AddF32("{}=dFdy({});", inst, op_a);
+    }
+}
+} // namespace Shader::Backend::GLSL