bld_base->op_actions[TGSI_OPCODE_U64DIV].emit = emit_udiv;
bld_base->op_actions[TGSI_OPCODE_I64DIV].emit = emit_idiv;
}
-
-/* Coordinates for cube map selection. sc, tc, and ma are as in Table 8.27
- * of the OpenGL 4.5 (Compatibility Profile) specification, except ma is
- * already multiplied by two. id is the cube face number.
- */
-struct cube_selection_coords {
- LLVMValueRef stc[2];
- LLVMValueRef ma;
- LLVMValueRef id;
-};
-
-static void build_cube_intrinsic(struct gallivm_state *gallivm,
- LLVMValueRef in[3],
- struct cube_selection_coords *out)
-{
- LLVMBuilderRef builder = gallivm->builder;
-
- if (HAVE_LLVM >= 0x0309) {
- LLVMTypeRef f32 = LLVMTypeOf(in[0]);
-
- out->stc[1] = lp_build_intrinsic(builder, "llvm.amdgcn.cubetc",
- f32, in, 3, LP_FUNC_ATTR_READNONE);
- out->stc[0] = lp_build_intrinsic(builder, "llvm.amdgcn.cubesc",
- f32, in, 3, LP_FUNC_ATTR_READNONE);
- out->ma = lp_build_intrinsic(builder, "llvm.amdgcn.cubema",
- f32, in, 3, LP_FUNC_ATTR_READNONE);
- out->id = lp_build_intrinsic(builder, "llvm.amdgcn.cubeid",
- f32, in, 3, LP_FUNC_ATTR_READNONE);
- } else {
- LLVMValueRef c[4] = {
- in[0],
- in[1],
- in[2],
- LLVMGetUndef(LLVMTypeOf(in[0]))
- };
- LLVMValueRef vec = lp_build_gather_values(gallivm, c, 4);
-
- LLVMValueRef tmp =
- lp_build_intrinsic(builder, "llvm.AMDGPU.cube",
- LLVMTypeOf(vec), &vec, 1,
- LP_FUNC_ATTR_READNONE);
-
- out->stc[1] = LLVMBuildExtractElement(builder, tmp,
- lp_build_const_int32(gallivm, 0), "");
- out->stc[0] = LLVMBuildExtractElement(builder, tmp,
- lp_build_const_int32(gallivm, 1), "");
- out->ma = LLVMBuildExtractElement(builder, tmp,
- lp_build_const_int32(gallivm, 2), "");
- out->id = LLVMBuildExtractElement(builder, tmp,
- lp_build_const_int32(gallivm, 3), "");
- }
-}
-
-/**
- * Build a manual selection sequence for cube face sc/tc coordinates and
- * major axis vector (multiplied by 2 for consistency) for the given
- * vec3 \p coords, for the face implied by \p selcoords.
- *
- * For the major axis, we always adjust the sign to be in the direction of
- * selcoords.ma; i.e., a positive out_ma means that coords is pointed towards
- * the selcoords major axis.
- */
-static void build_cube_select(LLVMBuilderRef builder,
- const struct cube_selection_coords *selcoords,
- const LLVMValueRef *coords,
- LLVMValueRef *out_st,
- LLVMValueRef *out_ma)
-{
- LLVMTypeRef f32 = LLVMTypeOf(coords[0]);
- LLVMValueRef is_ma_positive;
- LLVMValueRef sgn_ma;
- LLVMValueRef is_ma_z, is_not_ma_z;
- LLVMValueRef is_ma_y;
- LLVMValueRef is_ma_x;
- LLVMValueRef sgn;
- LLVMValueRef tmp;
-
- is_ma_positive = LLVMBuildFCmp(builder, LLVMRealUGE,
- selcoords->ma, LLVMConstReal(f32, 0.0), "");
- sgn_ma = LLVMBuildSelect(builder, is_ma_positive,
- LLVMConstReal(f32, 1.0), LLVMConstReal(f32, -1.0), "");
-
- is_ma_z = LLVMBuildFCmp(builder, LLVMRealUGE, selcoords->id, LLVMConstReal(f32, 4.0), "");
- is_not_ma_z = LLVMBuildNot(builder, is_ma_z, "");
- is_ma_y = LLVMBuildAnd(builder, is_not_ma_z,
- LLVMBuildFCmp(builder, LLVMRealUGE, selcoords->id, LLVMConstReal(f32, 2.0), ""), "");
- is_ma_x = LLVMBuildAnd(builder, is_not_ma_z, LLVMBuildNot(builder, is_ma_y, ""), "");
-
- /* Select sc */
- tmp = LLVMBuildSelect(builder, is_ma_z, coords[2], coords[0], "");
- sgn = LLVMBuildSelect(builder, is_ma_y, LLVMConstReal(f32, 1.0),
- LLVMBuildSelect(builder, is_ma_x, sgn_ma,
- LLVMBuildFNeg(builder, sgn_ma, ""), ""), "");
- out_st[0] = LLVMBuildFMul(builder, tmp, sgn, "");
-
- /* Select tc */
- tmp = LLVMBuildSelect(builder, is_ma_y, coords[2], coords[1], "");
- sgn = LLVMBuildSelect(builder, is_ma_y, LLVMBuildFNeg(builder, sgn_ma, ""),
- LLVMConstReal(f32, -1.0), "");
- out_st[1] = LLVMBuildFMul(builder, tmp, sgn, "");
-
- /* Select ma */
- tmp = LLVMBuildSelect(builder, is_ma_z, coords[2],
- LLVMBuildSelect(builder, is_ma_y, coords[1], coords[0], ""), "");
- sgn = LLVMBuildSelect(builder, is_ma_positive,
- LLVMConstReal(f32, 2.0), LLVMConstReal(f32, -2.0), "");
- *out_ma = LLVMBuildFMul(builder, tmp, sgn, "");
-}
-
-void si_prepare_cube_coords(struct lp_build_tgsi_context *bld_base,
- struct lp_build_emit_data *emit_data,
- LLVMValueRef *coords_arg,
- LLVMValueRef *derivs_arg)
-{
-
- unsigned target = emit_data->inst->Texture.Texture;
- unsigned opcode = emit_data->inst->Instruction.Opcode;
- struct gallivm_state *gallivm = bld_base->base.gallivm;
- LLVMBuilderRef builder = gallivm->builder;
- LLVMTypeRef type = bld_base->base.elem_type;
- struct cube_selection_coords selcoords;
- LLVMValueRef coords[3];
- LLVMValueRef invma;
-
- build_cube_intrinsic(gallivm, coords_arg, &selcoords);
-
- invma = lp_build_intrinsic(builder, "llvm.fabs.f32",
- type, &selcoords.ma, 1, LP_FUNC_ATTR_READNONE);
- invma = lp_build_emit_llvm_unary(bld_base, TGSI_OPCODE_RCP, invma);
-
- for (int i = 0; i < 2; ++i)
- coords[i] = LLVMBuildFMul(builder, selcoords.stc[i], invma, "");
-
- coords[2] = selcoords.id;
-
- if (opcode == TGSI_OPCODE_TXD && derivs_arg) {
- LLVMValueRef derivs[4];
- int axis;
-
- /* Convert cube derivatives to 2D derivatives. */
- for (axis = 0; axis < 2; axis++) {
- LLVMValueRef deriv_st[2];
- LLVMValueRef deriv_ma;
-
- /* Transform the derivative alongside the texture
- * coordinate. Mathematically, the correct formula is
- * as follows. Assume we're projecting onto the +Z face
- * and denote by dx/dh the derivative of the (original)
- * X texture coordinate with respect to horizontal
- * window coordinates. The projection onto the +Z face
- * plane is:
- *
- * f(x,z) = x/z
- *
- * Then df/dh = df/dx * dx/dh + df/dz * dz/dh
- * = 1/z * dx/dh - x/z * 1/z * dz/dh.
- *
- * This motivatives the implementation below.
- *
- * Whether this actually gives the expected results for
- * apps that might feed in derivatives obtained via
- * finite differences is anyone's guess. The OpenGL spec
- * seems awfully quiet about how textureGrad for cube
- * maps should be handled.
- */
- build_cube_select(builder, &selcoords, &derivs_arg[axis * 3],
- deriv_st, &deriv_ma);
-
- deriv_ma = LLVMBuildFMul(builder, deriv_ma, invma, "");
-
- for (int i = 0; i < 2; ++i)
- derivs[axis * 2 + i] =
- LLVMBuildFSub(builder,
- LLVMBuildFMul(builder, deriv_st[i], invma, ""),
- LLVMBuildFMul(builder, deriv_ma, coords[i], ""), "");
- }
-
- memcpy(derivs_arg, derivs, sizeof(derivs));
- }
-
- /* Shift the texture coordinate. This must be applied after the
- * derivative calculation.
- */
- for (int i = 0; i < 2; ++i)
- coords[i] = LLVMBuildFAdd(builder, coords[i], LLVMConstReal(type, 1.5), "");
-
- if (target == TGSI_TEXTURE_CUBE_ARRAY ||
- target == TGSI_TEXTURE_SHADOWCUBE_ARRAY) {
- /* for cube arrays coord.z = coord.w(array_index) * 8 + face */
- /* coords_arg.w component - array_index for cube arrays */
- coords[2] = lp_build_emit_llvm_ternary(bld_base, TGSI_OPCODE_MAD,
- coords_arg[3], lp_build_const_float(gallivm, 8.0), coords[2]);
- }
-
- memcpy(coords_arg, coords, sizeof(coords));
-}
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