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shader: add BVH8 intersections and instance transforms

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nmzik committed 2026-10-29 18:37:29 +01:00
1 parent bfd4c34b88
commit 5eab0ec738
21 files changed
+964 -15
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src/graphics/shader/recompiler/backend/spirv/spirvEmitterBvh.cpp
+25 -12
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@@ -30,16 +30,7 @@ uint32_t NodeWord(EmitterState& s, uint32_t block, uint32_t word) {
uint32_t Triangle(EmitterState& s, uint32_t block, uint32_t kind, uint32_t bary,
Vec3 origin, Vec3 direction) {
const auto f = TypeF32(s), u = TypeU32(s), b = TypeBool(s);
const auto zero = ConstantF32Value(s, 0.0f);
const auto op = [&](spv::Op code, uint32_t x, uint32_t y) {
const auto value = Binary(s, code, f, x, y);
s.builder.AddAnnotation(spv::OpDecorate, value, spv::DecorationNoContraction);
return value;
};
const auto cmp = [&](spv::Op code, uint32_t x, uint32_t y) { return Binary(s, code, b, x, y); };
const auto either = [&](uint32_t x, uint32_t y) { return Binary(s, spv::OpLogicalOr, b, x, y); };
const auto both = [&](uint32_t x, uint32_t y) { return Binary(s, spv::OpLogicalAnd, b, x, y); };
const auto abs = [&](uint32_t x) { return EmitGlsl<GLSLstd450FAbs, IR::Type::F32>(s, x); };
const auto is_kind = [&](uint32_t n) { return cmp(spv::OpIEqual, kind, ConstantU32(s, n)); };
// The four triangles are (0,1,2), (1,3,2), (2,3,4), (2,4,0).
const std::array vertices {
@@ -56,6 +47,28 @@ uint32_t Triangle(EmitterState& s, uint32_t block, uint32_t kind, uint32_t bary,
NodeWord(s, block, Binary(s, spv::OpIAdd, u, first, ConstantU32(s, axis))));
}
const auto flag = NodeWord(s, block, ConstantU32(s, 15));
const auto remap = Binary(s, spv::OpShiftRightLogical, u, flag,
Binary(s, spv::OpIMul, u, kind, ConstantU32(s, 8)));
return EmitBvhTriangle(s, positions, origin, direction, remap,
Binary(s, spv::OpIAdd, u, flag, kind), bary);
}
} // namespace
uint32_t EmitBvhTriangle(EmitterState& s, const std::array<Vec3, 3>& positions,
Vec3 origin, Vec3 direction, uint32_t remap,
uint32_t triangle_id, uint32_t bary) {
const auto f = TypeF32(s), u = TypeU32(s), b = TypeBool(s);
const auto zero = ConstantF32Value(s, 0.0f);
const auto op = [&](spv::Op code, uint32_t x, uint32_t y) {
const auto value = Binary(s, code, f, x, y);
s.builder.AddAnnotation(spv::OpDecorate, value, spv::DecorationNoContraction);
return value;
};
const auto cmp = [&](spv::Op code, uint32_t x, uint32_t y) { return Binary(s, code, b, x, y); };
const auto either = [&](uint32_t x, uint32_t y) { return Binary(s, spv::OpLogicalOr, b, x, y); };
const auto both = [&](uint32_t x, uint32_t y) { return Binary(s, spv::OpLogicalAnd, b, x, y); };
const auto abs = [&](uint32_t x) { return EmitGlsl<GLSLstd450FAbs, IR::Type::F32>(s, x); };
const auto y_largest = cmp(spv::OpFOrdLessThan, abs(direction[0]), abs(direction[1]));
const auto z_largest = cmp(spv::OpFOrdLessThan,
Select(s, f, y_largest, abs(direction[1]), abs(direction[0])), abs(direction[2]));
@@ -112,8 +125,6 @@ uint32_t Triangle(EmitterState& s, uint32_t block, uint32_t kind, uint32_t bary,
cmp(spv::OpFOrdGreaterThan, projected[i][1], zero), right);
missed = either(missed, both(cmp(spv::OpFOrdEqual, edge[i], zero), excluded));
}
const auto remap = Binary(s, spv::OpShiftRightLogical, u, flag,
Binary(s, spv::OpIMul, u, kind, ConstantU32(s, 8)));
const auto coordinate = [&](uint32_t shift) {
const auto index = Binary(s, spv::OpBitwiseAnd, u,
Binary(s, spv::OpShiftRightLogical, u, remap, ConstantU32(s, shift)), ConstantU32(s, 3));
@@ -124,11 +135,13 @@ uint32_t Triangle(EmitterState& s, uint32_t block, uint32_t kind, uint32_t bary,
const std::array result {
Unary(s, spv::OpBitcast, u, Select(s, f, missed, ConstantF32(s, 0x7f800000), numerator)),
Unary(s, spv::OpBitcast, u, Select(s, f, missed, ConstantF32Value(s, 1.0f), denominator)),
Select(s, u, bary, coordinate(0), Binary(s, spv::OpIAdd, u, flag, kind)),
Select(s, u, bary, coordinate(0), triangle_id),
Select(s, u, bary, coordinate(2), Select(s, u, missed, ConstantU32(s, 0), ConstantU32(s, 1))) };
return Vector(s, TypeU32Vector(s, 4), result);
}
namespace {
std::array<uint32_t, 6> Box(EmitterState& s, uint32_t first, uint32_t second,
uint32_t half, uint32_t child) {
const auto f = TypeF32(s);