nir_variable **inputs;
nir_variable **outputs;
+ nir_variable *samplers[PIPE_MAX_SAMPLERS];
+
+ nir_variable *input_var_face;
+ nir_variable *input_var_position;
+ nir_variable *input_var_point;
/**
* Stack of nir_cursors where instructions should be pushed as we pop
bool cap_scalar;
bool cap_face_is_sysval;
bool cap_position_is_sysval;
+ bool cap_point_is_sysval;
bool cap_packed_uniforms;
bool cap_samplers_as_deref;
};
#define ttn_swizzle(b, src, x, y, z, w) \
- nir_swizzle(b, src, SWIZ(x, y, z, w), 4, false)
+ nir_swizzle(b, src, SWIZ(x, y, z, w), 4)
#define ttn_channel(b, src, swiz) \
- nir_swizzle(b, src, SWIZ(swiz, swiz, swiz, swiz), 1, false)
+ nir_channel(b, src, TGSI_SWIZZLE_##swiz)
static gl_varying_slot
tgsi_varying_semantic_to_slot(unsigned semantic, unsigned index)
for (int i = 0; i < 4; i++)
src.swizzle[i] = i;
- return nir_fmov_alu(b, src, 4);
+ return nir_mov_alu(b, src, 4);
+}
+
+static enum glsl_interp_mode
+ttn_translate_interp_mode(unsigned tgsi_interp)
+{
+ switch (tgsi_interp) {
+ case TGSI_INTERPOLATE_CONSTANT:
+ return INTERP_MODE_FLAT;
+ case TGSI_INTERPOLATE_LINEAR:
+ return INTERP_MODE_NOPERSPECTIVE;
+ case TGSI_INTERPOLATE_PERSPECTIVE:
+ return INTERP_MODE_SMOOTH;
+ case TGSI_INTERPOLATE_COLOR:
+ return INTERP_MODE_SMOOTH;
+ default:
+ unreachable("bad TGSI interpolation mode");
+ }
}
static void
if (c->scan->processor == PIPE_SHADER_FRAGMENT) {
if (decl->Semantic.Name == TGSI_SEMANTIC_FACE) {
- var->data.location = SYSTEM_VALUE_FRONT_FACE;
- var->data.mode = nir_var_system_value;
+ var->type = glsl_bool_type();
+ if (c->cap_face_is_sysval) {
+ var->data.mode = nir_var_system_value;
+ var->data.location = SYSTEM_VALUE_FRONT_FACE;
+ } else {
+ var->data.location = VARYING_SLOT_FACE;
+ }
+ c->input_var_face = var;
+ } else if (decl->Semantic.Name == TGSI_SEMANTIC_POSITION) {
+ if (c->cap_position_is_sysval) {
+ var->data.mode = nir_var_system_value;
+ var->data.location = SYSTEM_VALUE_FRAG_COORD;
+ } else {
+ var->data.location = VARYING_SLOT_POS;
+ }
+ c->input_var_position = var;
+ } else if (decl->Semantic.Name == TGSI_SEMANTIC_PCOORD) {
+ if (c->cap_point_is_sysval) {
+ var->data.mode = nir_var_system_value;
+ var->data.location = SYSTEM_VALUE_POINT_COORD;
+ } else {
+ var->data.location = VARYING_SLOT_PNTC;
+ }
+ c->input_var_point = var;
} else {
var->data.location =
tgsi_varying_semantic_to_slot(decl->Semantic.Name,
var->data.location = VERT_ATTRIB_GENERIC0 + idx;
}
var->data.index = 0;
-
- /* We definitely need to translate the interpolation field, because
- * nir_print will decode it.
- */
- switch (decl->Interp.Interpolate) {
- case TGSI_INTERPOLATE_CONSTANT:
- var->data.interpolation = INTERP_MODE_FLAT;
- break;
- case TGSI_INTERPOLATE_LINEAR:
- var->data.interpolation = INTERP_MODE_NOPERSPECTIVE;
- break;
- case TGSI_INTERPOLATE_PERSPECTIVE:
- var->data.interpolation = INTERP_MODE_SMOOTH;
- break;
- }
+ var->data.interpolation =
+ ttn_translate_interp_mode(decl->Interp.Interpolate);
exec_list_push_tail(&b->shader->inputs, &var->node);
c->inputs[idx] = var;
var->data.mode = nir_var_shader_out;
var->name = ralloc_asprintf(var, "out_%d", idx);
var->data.index = 0;
+ var->data.interpolation =
+ ttn_translate_interp_mode(decl->Interp.Interpolate);
if (c->scan->processor == PIPE_SHADER_FRAGMENT) {
switch (semantic_name) {
case TGSI_FILE_CONSTANT:
var->data.mode = nir_var_uniform;
var->name = ralloc_asprintf(var, "uniform_%d", idx);
+ var->data.location = idx;
exec_list_push_tail(&b->shader->uniforms, &var->node);
break;
c->imm_defs[c->next_imm] = &load_const->def;
c->next_imm++;
- for (i = 0; i < 4; i++)
- load_const->value.u32[i] = tgsi_imm->u[i].Uint;
+ for (i = 0; i < load_const->def.num_components; i++)
+ load_const->value[i].u32 = tgsi_imm->u[i].Uint;
nir_builder_instr_insert(b, &load_const->instr);
}
}
/* Special case: Turn the frontface varying into a load of the
- * frontface intrinsic plus math, and appending the silly floats.
+ * frontface variable, and create the vector as required by TGSI.
*/
static nir_ssa_def *
ttn_emulate_tgsi_front_face(struct ttn_compile *c)
{
- nir_ssa_def *tgsi_frontface[4] = {
- nir_bcsel(&c->build,
- nir_load_front_face(&c->build, 1),
- nir_imm_float(&c->build, 1.0),
- nir_imm_float(&c->build, -1.0)),
- nir_imm_float(&c->build, 0.0),
- nir_imm_float(&c->build, 0.0),
- nir_imm_float(&c->build, 1.0),
- };
+ nir_ssa_def *tgsi_frontface[4];
+
+ if (c->cap_face_is_sysval) {
+ /* When it's a system value, it should be an integer vector: (F, 0, 0, 1)
+ * F is 0xffffffff if front-facing, 0 if not.
+ */
+
+ nir_ssa_def *frontface = nir_load_front_face(&c->build, 1);
+
+ tgsi_frontface[0] = nir_bcsel(&c->build,
+ frontface,
+ nir_imm_int(&c->build, 0xffffffff),
+ nir_imm_int(&c->build, 0));
+ tgsi_frontface[1] = nir_imm_int(&c->build, 0);
+ tgsi_frontface[2] = nir_imm_int(&c->build, 0);
+ tgsi_frontface[3] = nir_imm_int(&c->build, 1);
+ } else {
+ /* When it's an input, it should be a float vector: (F, 0.0, 0.0, 1.0)
+ * F is positive if front-facing, negative if not.
+ */
+
+ assert(c->input_var_face);
+ nir_ssa_def *frontface = nir_load_var(&c->build, c->input_var_face);
+
+ tgsi_frontface[0] = nir_bcsel(&c->build,
+ frontface,
+ nir_imm_float(&c->build, 1.0),
+ nir_imm_float(&c->build, -1.0));
+ tgsi_frontface[1] = nir_imm_float(&c->build, 0.0);
+ tgsi_frontface[2] = nir_imm_float(&c->build, 0.0);
+ tgsi_frontface[3] = nir_imm_float(&c->build, 1.0);
+ }
return nir_vec(&c->build, tgsi_frontface, 4);
}
ttn_src_for_file_and_index(struct ttn_compile *c, unsigned file, unsigned index,
struct tgsi_ind_register *indirect,
struct tgsi_dimension *dim,
- struct tgsi_ind_register *dimind)
+ struct tgsi_ind_register *dimind,
+ bool src_is_float)
{
nir_builder *b = &c->build;
nir_src src;
op = nir_intrinsic_load_instance_id;
load = nir_load_instance_id(b);
break;
+ case TGSI_SEMANTIC_FACE:
+ assert(c->cap_face_is_sysval);
+ op = nir_intrinsic_load_front_face;
+ load = ttn_emulate_tgsi_front_face(c);
+ break;
+ case TGSI_SEMANTIC_POSITION:
+ assert(c->cap_position_is_sysval);
+ op = nir_intrinsic_load_frag_coord;
+ load = nir_load_frag_coord(b);
+ break;
+ case TGSI_SEMANTIC_PCOORD:
+ assert(c->cap_point_is_sysval);
+ op = nir_intrinsic_load_point_coord;
+ load = nir_load_point_coord(b);
+ break;
default:
unreachable("bad system value");
}
case TGSI_FILE_INPUT:
if (c->scan->processor == PIPE_SHADER_FRAGMENT &&
c->scan->input_semantic_name[index] == TGSI_SEMANTIC_FACE) {
+ assert(!c->cap_face_is_sysval && c->input_var_face);
return nir_src_for_ssa(ttn_emulate_tgsi_front_face(c));
+ } else if (c->scan->processor == PIPE_SHADER_FRAGMENT &&
+ c->scan->input_semantic_name[index] == TGSI_SEMANTIC_POSITION) {
+ assert(!c->cap_position_is_sysval && c->input_var_position);
+ return nir_src_for_ssa(nir_load_var(&c->build, c->input_var_position));
+ } else if (c->scan->processor == PIPE_SHADER_FRAGMENT &&
+ c->scan->input_semantic_name[index] == TGSI_SEMANTIC_PCOORD) {
+ assert(!c->cap_point_is_sysval && c->input_var_point);
+ return nir_src_for_ssa(nir_load_var(&c->build, c->input_var_point));
} else {
/* Indirection on input arrays isn't supported by TTN. */
assert(!dim);
}
load = nir_intrinsic_instr_create(b->shader, op);
+ if (op == nir_intrinsic_load_uniform) {
+ nir_intrinsic_set_type(load, src_is_float ? nir_type_float :
+ nir_type_int);
+ }
load->num_components = 4;
if (dim && (dim->Index > 0 || dim->Indirect)) {
if (dimind) {
load->src[srcn] =
ttn_src_for_file_and_index(c, dimind->File, dimind->Index,
- NULL, NULL, NULL);
+ NULL, NULL, NULL, false);
} else {
/* UBOs start at index 1 in TGSI: */
load->src[srcn] =
src.src = ttn_src_for_file_and_index(c,
indirect->File,
indirect->Index,
- NULL, NULL, NULL);
- return nir_imov_alu(b, src, 1);
+ NULL, NULL, NULL,
+ false);
+ return nir_mov_alu(b, src, 1);
}
static nir_alu_dest
src.src = ttn_src_for_file_and_index(c,
tgsi_src->File,
tgsi_src->Index,
- ind, dim, dimind);
+ ind, dim, dimind,
+ src_is_float);
}
src.swizzle[0] = tgsi_src->SwizzleX;
src.swizzle[2] = tgsi_src->SwizzleZ;
src.swizzle[3] = tgsi_src->SwizzleW;
- nir_ssa_def *def = nir_fmov_alu(b, src, 4);
+ nir_ssa_def *def = nir_mov_alu(b, src, 4);
if (tgsi_src->Absolute) {
if (src_is_float)
return def;
}
-static void
-ttn_alu(nir_builder *b, nir_op op, nir_alu_dest dest, nir_ssa_def **src)
-{
- unsigned num_srcs = nir_op_infos[op].num_inputs;
- nir_alu_instr *instr = nir_alu_instr_create(b->shader, op);
- unsigned i;
-
- for (i = 0; i < num_srcs; i++)
- instr->src[i].src = nir_src_for_ssa(src[i]);
-
- instr->dest = dest;
- nir_builder_instr_insert(b, &instr->instr);
-}
-
static void
ttn_move_dest_masked(nir_builder *b, nir_alu_dest dest,
nir_ssa_def *def, unsigned write_mask)
if (!(dest.write_mask & write_mask))
return;
- nir_alu_instr *mov = nir_alu_instr_create(b->shader, nir_op_imov);
+ nir_alu_instr *mov = nir_alu_instr_create(b->shader, nir_op_mov);
mov->dest = dest;
mov->dest.write_mask &= write_mask;
mov->src[0].src = nir_src_for_ssa(def);
ttn_move_dest_masked(b, dest, def, TGSI_WRITEMASK_XYZW);
}
+static void
+ttn_alu(nir_builder *b, nir_op op, nir_alu_dest dest, nir_ssa_def **src)
+{
+ nir_ssa_def *def = nir_build_alu_src_arr(b, op, src);
+ if (def->bit_size == 1)
+ def = nir_ineg(b, nir_b2i(b, def, 32));
+ ttn_move_dest(b, dest, def);
+}
+
static void
ttn_arl(nir_builder *b, nir_op op, nir_alu_dest dest, nir_ssa_def **src)
{
{
ttn_move_dest_masked(b, dest, nir_imm_float(b, 1.0), TGSI_WRITEMASK_X);
ttn_move_dest_masked(b, dest, nir_fmul(b, src[0], src[1]), TGSI_WRITEMASK_Y);
- ttn_move_dest_masked(b, dest, nir_fmov(b, src[0]), TGSI_WRITEMASK_Z);
- ttn_move_dest_masked(b, dest, nir_fmov(b, src[1]), TGSI_WRITEMASK_W);
+ ttn_move_dest_masked(b, dest, nir_mov(b, src[0]), TGSI_WRITEMASK_Z);
+ ttn_move_dest_masked(b, dest, nir_mov(b, src[1]), TGSI_WRITEMASK_W);
}
/* LIT - Light Coefficients
}
}
+static enum glsl_base_type
+base_type_for_alu_type(nir_alu_type type)
+{
+ type = nir_alu_type_get_base_type(type);
+
+ switch (type) {
+ case nir_type_float:
+ return GLSL_TYPE_FLOAT;
+ case nir_type_int:
+ return GLSL_TYPE_INT;
+ case nir_type_uint:
+ return GLSL_TYPE_UINT;
+ default:
+ unreachable("invalid type");
+ }
+}
+
+static nir_variable *
+get_sampler_var(struct ttn_compile *c, int binding,
+ enum glsl_sampler_dim dim,
+ bool is_shadow,
+ bool is_array,
+ enum glsl_base_type base_type)
+{
+ nir_variable *var = c->samplers[binding];
+ if (!var) {
+ const struct glsl_type *type =
+ glsl_sampler_type(dim, is_shadow, is_array, base_type);
+ var = nir_variable_create(c->build.shader, nir_var_uniform, type,
+ "sampler");
+ var->data.binding = binding;
+ var->data.explicit_binding = true;
+ c->samplers[binding] = var;
+ }
+
+ return var;
+}
+
static void
ttn_tex(struct ttn_compile *c, nir_alu_dest dest, nir_ssa_def **src)
{
num_srcs++;
}
+ /* Deref sources */
+ num_srcs += 2;
+
num_srcs += tgsi_inst->Texture.NumOffsets;
instr = nir_tex_instr_create(b->shader, num_srcs);
instr->coord_components++;
assert(tgsi_inst->Src[samp].Register.File == TGSI_FILE_SAMPLER);
- instr->texture_index = tgsi_inst->Src[samp].Register.Index;
- instr->sampler_index = tgsi_inst->Src[samp].Register.Index;
/* TODO if we supported any opc's which take an explicit SVIEW
* src, we would use that here instead. But for the "legacy"
* texture opc's the SVIEW index is same as SAMP index:
*/
- sview = instr->texture_index;
+ sview = tgsi_inst->Src[samp].Register.Index;
if (op == nir_texop_lod) {
instr->dest_type = nir_type_float;
instr->dest_type = nir_type_float;
}
+ nir_variable *var =
+ get_sampler_var(c, sview, instr->sampler_dim,
+ instr->is_shadow,
+ instr->is_array,
+ base_type_for_alu_type(instr->dest_type));
+
+ nir_deref_instr *deref = nir_build_deref_var(b, var);
+
unsigned src_number = 0;
+ instr->src[src_number].src = nir_src_for_ssa(&deref->dest.ssa);
+ instr->src[src_number].src_type = nir_tex_src_texture_deref;
+ src_number++;
+ instr->src[src_number].src = nir_src_for_ssa(&deref->dest.ssa);
+ instr->src[src_number].src_type = nir_tex_src_sampler_deref;
+ src_number++;
+
instr->src[src_number].src =
nir_src_for_ssa(nir_swizzle(b, src[0], SWIZ(X, Y, Z, W),
- instr->coord_components, false));
+ instr->coord_components));
instr->src[src_number].src_type = nir_tex_src_coord;
src_number++;
instr->src[src_number].src_type = nir_tex_src_ddx;
instr->src[src_number].src =
nir_src_for_ssa(nir_swizzle(b, src[1], SWIZ(X, Y, Z, W),
- nir_tex_instr_src_size(instr, src_number),
- false));
+ nir_tex_instr_src_size(instr, src_number)));
src_number++;
instr->src[src_number].src_type = nir_tex_src_ddy;
instr->src[src_number].src =
nir_src_for_ssa(nir_swizzle(b, src[2], SWIZ(X, Y, Z, W),
- nir_tex_instr_src_size(instr, src_number),
- false));
+ nir_tex_instr_src_size(instr, src_number)));
src_number++;
}
src.src = ttn_src_for_file_and_index(c,
tex_offset->File,
tex_offset->Index,
- NULL, NULL, NULL);
+ NULL, NULL, NULL,
+ true);
src.swizzle[0] = tex_offset->SwizzleX;
src.swizzle[1] = tex_offset->SwizzleY;
instr->src[src_number].src_type = nir_tex_src_offset;
instr->src[src_number].src = nir_src_for_ssa(
- nir_fmov_alu(b, src, nir_tex_instr_src_size(instr, src_number)));
+ nir_mov_alu(b, src, nir_tex_instr_src_size(instr, src_number)));
src_number++;
}
assert(src_number == num_srcs);
+ assert(src_number == instr->num_srcs);
nir_ssa_dest_init(&instr->instr, &instr->dest,
nir_tex_instr_dest_size(instr),
struct tgsi_full_instruction *tgsi_inst = &c->token->FullInstruction;
nir_tex_instr *txs, *qlv;
- txs = nir_tex_instr_create(b->shader, 1);
+ txs = nir_tex_instr_create(b->shader, 2);
txs->op = nir_texop_txs;
setup_texture_info(txs, tgsi_inst->Texture.Texture);
- qlv = nir_tex_instr_create(b->shader, 0);
+ qlv = nir_tex_instr_create(b->shader, 1);
qlv->op = nir_texop_query_levels;
setup_texture_info(qlv, tgsi_inst->Texture.Texture);
assert(tgsi_inst->Src[1].Register.File == TGSI_FILE_SAMPLER);
- txs->texture_index = tgsi_inst->Src[1].Register.Index;
- qlv->texture_index = tgsi_inst->Src[1].Register.Index;
+ int tex_index = tgsi_inst->Src[1].Register.Index;
+
+ nir_variable *var =
+ get_sampler_var(c, tex_index, txs->sampler_dim,
+ txs->is_shadow,
+ txs->is_array,
+ base_type_for_alu_type(txs->dest_type));
+
+ nir_deref_instr *deref = nir_build_deref_var(b, var);
+
+ txs->src[0].src = nir_src_for_ssa(&deref->dest.ssa);
+ txs->src[0].src_type = nir_tex_src_texture_deref;
+
+ qlv->src[0].src = nir_src_for_ssa(&deref->dest.ssa);
+ qlv->src[0].src_type = nir_tex_src_texture_deref;
- /* only single src, the lod: */
- txs->src[0].src = nir_src_for_ssa(ttn_channel(b, src[0], X));
- txs->src[0].src_type = nir_tex_src_lod;
+ /* lod: */
+ txs->src[1].src = nir_src_for_ssa(ttn_channel(b, src[0], X));
+ txs->src[1].src_type = nir_tex_src_lod;
nir_ssa_dest_init(&txs->instr, &txs->dest,
nir_tex_instr_dest_size(txs), 32, NULL);
static const nir_op op_trans[TGSI_OPCODE_LAST] = {
[TGSI_OPCODE_ARL] = 0,
- [TGSI_OPCODE_MOV] = nir_op_fmov,
+ [TGSI_OPCODE_MOV] = nir_op_mov,
[TGSI_OPCODE_LIT] = 0,
[TGSI_OPCODE_RCP] = nir_op_frcp,
[TGSI_OPCODE_RSQ] = nir_op_frsq,
[TGSI_OPCODE_ENDSUB] = 0, /* XXX: no function calls */
[TGSI_OPCODE_NOP] = 0,
- [TGSI_OPCODE_FSEQ] = nir_op_feq32,
- [TGSI_OPCODE_FSGE] = nir_op_fge32,
- [TGSI_OPCODE_FSLT] = nir_op_flt32,
- [TGSI_OPCODE_FSNE] = nir_op_fne32,
+ [TGSI_OPCODE_FSEQ] = nir_op_feq,
+ [TGSI_OPCODE_FSGE] = nir_op_fge,
+ [TGSI_OPCODE_FSLT] = nir_op_flt,
+ [TGSI_OPCODE_FSNE] = nir_op_fne,
[TGSI_OPCODE_KILL_IF] = 0,
[TGSI_OPCODE_IMAX] = nir_op_imax,
[TGSI_OPCODE_IMIN] = nir_op_imin,
[TGSI_OPCODE_INEG] = nir_op_ineg,
- [TGSI_OPCODE_ISGE] = nir_op_ige32,
+ [TGSI_OPCODE_ISGE] = nir_op_ige,
[TGSI_OPCODE_ISHR] = nir_op_ishr,
- [TGSI_OPCODE_ISLT] = nir_op_ilt32,
+ [TGSI_OPCODE_ISLT] = nir_op_ilt,
[TGSI_OPCODE_F2U] = nir_op_f2u32,
[TGSI_OPCODE_U2F] = nir_op_u2f32,
[TGSI_OPCODE_UADD] = nir_op_iadd,
[TGSI_OPCODE_UMIN] = nir_op_umin,
[TGSI_OPCODE_UMOD] = nir_op_umod,
[TGSI_OPCODE_UMUL] = nir_op_imul,
- [TGSI_OPCODE_USEQ] = nir_op_ieq32,
- [TGSI_OPCODE_USGE] = nir_op_uge32,
+ [TGSI_OPCODE_USEQ] = nir_op_ieq,
+ [TGSI_OPCODE_USGE] = nir_op_uge,
[TGSI_OPCODE_USHR] = nir_op_ushr,
- [TGSI_OPCODE_USLT] = nir_op_ult32,
- [TGSI_OPCODE_USNE] = nir_op_ine32,
+ [TGSI_OPCODE_USLT] = nir_op_ult,
+ [TGSI_OPCODE_USNE] = nir_op_ine,
[TGSI_OPCODE_SWITCH] = 0, /* not emitted by glsl_to_tgsi.cpp */
[TGSI_OPCODE_CASE] = 0, /* not emitted by glsl_to_tgsi.cpp */
/* XXX: SAMPLE opcodes */
- [TGSI_OPCODE_UARL] = nir_op_imov,
+ [TGSI_OPCODE_UARL] = nir_op_mov,
[TGSI_OPCODE_UCMP] = 0,
[TGSI_OPCODE_IABS] = nir_op_iabs,
[TGSI_OPCODE_ISSG] = nir_op_isign,
c->cap_samplers_as_deref = screen->get_param(screen, PIPE_CAP_NIR_SAMPLERS_AS_DEREF);
c->cap_face_is_sysval = screen->get_param(screen, PIPE_CAP_TGSI_FS_FACE_IS_INTEGER_SYSVAL);
c->cap_position_is_sysval = screen->get_param(screen, PIPE_CAP_TGSI_FS_POSITION_IS_SYSVAL);
+ c->cap_point_is_sysval = screen->get_param(screen, PIPE_CAP_TGSI_FS_POINT_IS_SYSVAL);
}
/**
NIR_PASS_V(nir, nir_lower_vars_to_ssa);
if (scalar) {
- NIR_PASS_V(nir, nir_lower_alu_to_scalar);
+ NIR_PASS_V(nir, nir_lower_alu_to_scalar, NULL);
NIR_PASS_V(nir, nir_lower_phis_to_scalar);
}
NIR_PASS(progress, nir, nir_opt_dce);
}
- NIR_PASS(progress, nir, nir_opt_if);
+ NIR_PASS(progress, nir, nir_opt_if, false);
NIR_PASS(progress, nir, nir_opt_dead_cf);
NIR_PASS(progress, nir, nir_opt_cse);
NIR_PASS(progress, nir, nir_opt_peephole_select, 8, true, true);
NIR_PASS_V(nir, nir_lower_global_vars_to_local);
NIR_PASS_V(nir, nir_split_var_copies);
NIR_PASS_V(nir, nir_lower_var_copies);
+ NIR_PASS_V(nir, nir_lower_system_values);
if (c->cap_packed_uniforms)
NIR_PASS_V(nir, nir_lower_uniforms_to_ubo, 16);
projects / mesa.git / blobdiff