radv/gfx10: fix the vertex order for triangle strips emitted by a GS
My fix wasn't totally correct as pointed out by Marek.
Ported from RadeonSI.
Fixes: deafe4cc58
("radv/gfx10: fix primitive indices orientation for NGG GS")
Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
This commit is contained in:
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dac6bd29ae
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4cacba0c86
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@ -2357,7 +2357,6 @@ static void build_sendmsg_gs_alloc_req(struct radv_shader_context *ctx,
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struct ngg_prim {
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unsigned num_vertices;
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LLVMValueRef isnull;
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LLVMValueRef swap;
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LLVMValueRef index[3];
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LLVMValueRef edgeflag[3];
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};
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@ -2367,52 +2366,19 @@ static void build_export_prim(struct radv_shader_context *ctx,
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{
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LLVMBuilderRef builder = ctx->ac.builder;
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struct ac_export_args args;
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LLVMValueRef vertices[3];
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LLVMValueRef odd, even;
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LLVMValueRef tmp;
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tmp = LLVMBuildZExt(builder, prim->isnull, ctx->ac.i32, "");
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args.out[0] = LLVMBuildShl(builder, tmp, LLVMConstInt(ctx->ac.i32, 31, false), "");
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for (unsigned i = 0; i < prim->num_vertices; ++i) {
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tmp = LLVMBuildShl(builder, prim->index[i],
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LLVMConstInt(ctx->ac.i32, 10 * i, false), "");
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args.out[0] = LLVMBuildOr(builder, args.out[0], tmp, "");
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tmp = LLVMBuildZExt(builder, prim->edgeflag[i], ctx->ac.i32, "");
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tmp = LLVMBuildShl(builder, tmp,
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LLVMConstInt(ctx->ac.i32, 9, false), "");
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vertices[i] = LLVMBuildOr(builder, prim->index[i], tmp, "");
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}
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switch (prim->num_vertices) {
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case 1:
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args.out[0] = LLVMBuildOr(builder, args.out[0], vertices[0], "");
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break;
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case 2:
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tmp = LLVMBuildShl(builder, vertices[1],
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LLVMConstInt(ctx->ac.i32, 10, false), "");
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tmp = LLVMBuildOr(builder, args.out[0], tmp, "");
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args.out[0] = LLVMBuildOr(builder, tmp, vertices[0], "");
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break;
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case 3:
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/* Swap vertices if needed to follow drawing order. */
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tmp = LLVMBuildShl(builder, vertices[2],
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LLVMConstInt(ctx->ac.i32, 20, false), "");
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even = LLVMBuildOr(builder, args.out[0], tmp, "");
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tmp = LLVMBuildShl(builder, vertices[1],
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LLVMConstInt(ctx->ac.i32, 10, false), "");
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even = LLVMBuildOr(builder, even, tmp, "");
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even = LLVMBuildOr(builder, even, vertices[0], "");
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tmp = LLVMBuildShl(builder, vertices[1],
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LLVMConstInt(ctx->ac.i32, 20, false), "");
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odd = LLVMBuildOr(builder, args.out[0], tmp, "");
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tmp = LLVMBuildShl(builder, vertices[2],
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LLVMConstInt(ctx->ac.i32, 10, false), "");
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odd = LLVMBuildOr(builder, odd, tmp, "");
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odd = LLVMBuildOr(builder, odd, vertices[0], "");
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args.out[0] = LLVMBuildSelect(builder, prim->swap, odd, even, "");
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break;
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default:
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unreachable("invalid number of vertices");
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LLVMConstInt(ctx->ac.i32, 10 * i + 9, false), "");
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args.out[0] = LLVMBuildOr(builder, args.out[0], tmp, "");
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}
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args.out[0] = LLVMBuildBitCast(builder, args.out[0], ctx->ac.f32, "");
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@ -3040,7 +3006,6 @@ handle_ngg_outputs_post_2(struct radv_shader_context *ctx)
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prim.num_vertices = num_vertices;
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prim.isnull = ctx->ac.i1false;
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prim.swap = ctx->ac.i1false;
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memcpy(prim.index, vtxindex, sizeof(vtxindex[0]) * 3);
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for (unsigned i = 0; i < num_vertices; ++i) {
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@ -3338,6 +3303,7 @@ static void gfx10_ngg_gs_emit_epilogue_2(struct radv_shader_context *ctx)
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tmp = LLVMBuildICmp(builder, LLVMIntULT, tid, num_emit_threads, "");
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ac_build_ifcc(&ctx->ac, tmp, 5140);
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{
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LLVMValueRef flags;
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struct ngg_prim prim = {};
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prim.num_vertices = verts_per_prim;
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@ -3348,12 +3314,8 @@ static void gfx10_ngg_gs_emit_epilogue_2(struct radv_shader_context *ctx)
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ctx->ac.i32_0, /* primflag */
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};
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tmp = LLVMBuildGEP(builder, tmp, gep_idx, 3, "");
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tmp = LLVMBuildLoad(builder, tmp, "");
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prim.isnull = LLVMBuildICmp(builder, LLVMIntEQ, tmp,
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LLVMConstInt(ctx->ac.i8, 0, false), "");
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prim.swap = LLVMBuildICmp(builder, LLVMIntEQ,
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LLVMBuildAnd(builder, tid, LLVMConstInt(ctx->ac.i32, 1, false), ""),
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LLVMConstInt(ctx->ac.i32, 1, false), "");
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flags = LLVMBuildLoad(builder, tmp, "");
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prim.isnull = LLVMBuildNot(builder, LLVMBuildTrunc(builder, flags, ctx->ac.i1, ""), "");
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for (unsigned i = 0; i < verts_per_prim; ++i) {
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prim.index[i] = LLVMBuildSub(builder, vertlive_scan.result_exclusive,
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@ -3361,6 +3323,24 @@ static void gfx10_ngg_gs_emit_epilogue_2(struct radv_shader_context *ctx)
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prim.edgeflag[i] = ctx->ac.i1false;
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}
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/* Geometry shaders output triangle strips, but NGG expects
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* triangles. We need to change the vertex order for odd
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* triangles to get correct front/back facing by swapping 2
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* vertex indices, but we also have to keep the provoking
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* vertex in the same place.
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*/
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if (verts_per_prim == 3) {
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LLVMValueRef is_odd = LLVMBuildLShr(builder, flags, ctx->ac.i8_1, "");
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is_odd = LLVMBuildTrunc(builder, is_odd, ctx->ac.i1, "");
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struct ngg_prim in = prim;
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prim.index[0] = in.index[0];
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prim.index[1] = LLVMBuildSelect(builder, is_odd,
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in.index[2], in.index[1], "");
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prim.index[2] = LLVMBuildSelect(builder, is_odd,
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in.index[1], in.index[2], "");
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}
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build_export_prim(ctx, &prim);
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}
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ac_build_endif(&ctx->ac, 5140);
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@ -3514,6 +3494,17 @@ static void gfx10_ngg_gs_emit_vertex(struct radv_shader_context *ctx,
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const LLVMValueRef iscompleteprim =
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LLVMBuildICmp(builder, LLVMIntUGE, curverts, tmp, "");
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/* Since the geometry shader emits triangle strips, we need to
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* track which primitive is odd and swap vertex indices to get
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* the correct vertex order.
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*/
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LLVMValueRef is_odd = ctx->ac.i1false;
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if (stream == 0 &&
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si_conv_gl_prim_to_vertices(ctx->shader->info.gs.output_primitive) == 3) {
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tmp = LLVMBuildAnd(builder, curverts, ctx->ac.i32_1, "");
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is_odd = LLVMBuildICmp(builder, LLVMIntEQ, tmp, ctx->ac.i32_1, "");
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}
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tmp = LLVMBuildAdd(builder, curverts, ctx->ac.i32_1, "");
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LLVMBuildStore(builder, tmp, ctx->gs_curprim_verts[stream]);
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@ -3525,7 +3516,15 @@ static void gfx10_ngg_gs_emit_vertex(struct radv_shader_context *ctx,
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const LLVMValueRef primflagptr =
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LLVMBuildGEP(builder, vertexptr, gep_idx, 3, "");
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/* The per-vertex primitive flag encoding:
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* bit 0: whether this vertex finishes a primitive
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* bit 1: whether the primitive is odd (if we are emitting triangle strips)
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*/
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tmp = LLVMBuildZExt(builder, iscompleteprim, ctx->ac.i8, "");
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tmp = LLVMBuildOr(builder, tmp,
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LLVMBuildShl(builder,
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LLVMBuildZExt(builder, is_odd, ctx->ac.i8, ""),
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ctx->ac.i8_1, ""), "");
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LLVMBuildStore(builder, tmp, primflagptr);
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tmp = LLVMBuildLoad(builder, ctx->gs_generated_prims[stream], "");
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