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broadcom/compiler: track partially interpolated fragment inputs

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We will need these to implement GLSL's interpolateAt*() functions where
we are required to perform interpolation in the shader at arbitrary
offsets.

Acked-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7155>
This commit is contained in:
Iago Toral Quiroga
2020-08-05 10:53:59 +02:00
committed by Alejandro Piñeiro
parent 71ed8c5aa6
commit 3ec165bce9
2 changed files with 83 additions and 17 deletions
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85
src/broadcom/compiler/nir_to_vir.c
View File

@@ -92,6 +92,29 @@ resize_qreg_array(struct v3d_compile *c,
(*regs)[i] = c->undef;
}
static void
resize_interp_array(struct v3d_compile *c,
struct v3d_interp_input **regs,
uint32_t *size,
uint32_t decl_size)
{
if (*size >= decl_size)
return;
uint32_t old_size = *size;
*size = MAX2(*size * 2, decl_size);
*regs = reralloc(c, *regs, struct v3d_interp_input, *size);
if (!*regs) {
fprintf(stderr, "Malloc failure\n");
abort();
}
for (uint32_t i = old_size; i < *size; i++) {
(*regs)[i].vp = c->undef;
(*regs)[i].C = c->undef;
}
}
void
vir_emit_thrsw(struct v3d_compile *c)
{
@@ -665,7 +688,7 @@ emit_fragcoord_input(struct v3d_compile *c, int attr)
static struct qreg
emit_fragment_varying(struct v3d_compile *c, nir_variable *var,
uint8_t swizzle, int array_index)
int8_t input_idx, uint8_t swizzle, int array_index)
{
struct qreg r3 = vir_reg(QFILE_MAGIC, V3D_QPU_WADDR_R3);
struct qreg r5 = vir_reg(QFILE_MAGIC, V3D_QPU_WADDR_R5);
@@ -681,11 +704,22 @@ emit_fragment_varying(struct v3d_compile *c, nir_variable *var,
vary = r3;
}
/* Store the input value before interpolation so we can implement
* GLSL's interpolateAt functions if the shader uses them.
*/
if (input_idx >= 0) {
assert(var);
c->interp[input_idx].vp = vary;
c->interp[input_idx].C = vir_MOV(c, r5);
c->interp[input_idx].mode = var->data.interpolation;
}
/* For gl_PointCoord input or distance along a line, we'll be called
* with no nir_variable, and we don't count toward VPM size so we
* don't track an input slot.
*/
if (!var) {
assert(input_idx < 0);
return vir_FADD(c, vir_FMUL(c, vary, c->payload_w), r5);
}
@@ -694,6 +728,7 @@ emit_fragment_varying(struct v3d_compile *c, nir_variable *var,
v3d_slot_from_slot_and_component(var->data.location +
array_index, swizzle);
struct qreg result;
switch (var->data.interpolation) {
case INTERP_MODE_NONE:
/* If a gl_FrontColor or gl_BackColor input has no interp
@@ -708,11 +743,12 @@ emit_fragment_varying(struct v3d_compile *c, nir_variable *var,
if (c->fs_key->shade_model_flat) {
BITSET_SET(c->flat_shade_flags, i);
vir_MOV_dest(c, c->undef, vary);
return vir_MOV(c, r5);
result = vir_MOV(c, r5);
} else {
return vir_FADD(c, vir_FMUL(c, vary,
c->payload_w), r5);
result = vir_FADD(c, vir_FMUL(c, vary,
c->payload_w), r5);
}
goto done;
default:
break;
}
@@ -720,21 +756,32 @@ emit_fragment_varying(struct v3d_compile *c, nir_variable *var,
case INTERP_MODE_SMOOTH:
if (var->data.centroid) {
BITSET_SET(c->centroid_flags, i);
return vir_FADD(c, vir_FMUL(c, vary,
c->payload_w_centroid), r5);
result = vir_FADD(c, vir_FMUL(c, vary,
c->payload_w_centroid), r5);
} else {
return vir_FADD(c, vir_FMUL(c, vary, c->payload_w), r5);
result = vir_FADD(c, vir_FMUL(c, vary, c->payload_w), r5);
}
break;
case INTERP_MODE_NOPERSPECTIVE:
BITSET_SET(c->noperspective_flags, i);
return vir_FADD(c, vir_MOV(c, vary), r5);
result = vir_FADD(c, vir_MOV(c, vary), r5);
break;
case INTERP_MODE_FLAT:
BITSET_SET(c->flat_shade_flags, i);
vir_MOV_dest(c, c->undef, vary);
return vir_MOV(c, r5);
result = vir_MOV(c, r5);
break;
default:
unreachable("Bad interp mode");
}
done:
if (input_idx >= 0)
c->inputs[input_idx] = result;
return result;
}
static void
@@ -743,8 +790,8 @@ emit_fragment_input(struct v3d_compile *c, int base_attr, nir_variable *var,
{
for (int i = 0; i < nelem ; i++) {
int chan = var->data.location_frac + i;
c->inputs[(base_attr + array_index) * 4 + chan] =
emit_fragment_varying(c, var, chan, array_index);
int input_idx = (base_attr + array_index) * 4 + chan;
emit_fragment_varying(c, var, input_idx, chan, array_index);
}
}
@@ -757,8 +804,8 @@ emit_compact_fragment_input(struct v3d_compile *c, int attr, nir_variable *var,
*/
int loc_offset = array_index / 4;
int chan = var->data.location_frac + array_index % 4;
c->inputs[(attr + loc_offset) * 4 + chan] =
emit_fragment_varying(c, var, chan, loc_offset);
int input_idx = (attr + loc_offset) * 4 + chan;
emit_fragment_varying(c, var, input_idx, chan, loc_offset);
}
static void
@@ -1705,8 +1752,12 @@ ntq_setup_fs_inputs(struct v3d_compile *c)
unsigned var_len = glsl_count_vec4_slots(var->type, false, false);
unsigned loc = var->data.driver_location;
uint32_t inputs_array_size = c->inputs_array_size;
uint32_t inputs_array_required_size = (loc + var_len) * 4;
resize_qreg_array(c, &c->inputs, &c->inputs_array_size,
(loc + var_len) * 4);
inputs_array_required_size);
resize_interp_array(c, &c->interp, &inputs_array_size,
inputs_array_required_size);
if (var->data.location == VARYING_SLOT_POS) {
emit_fragcoord_input(c, loc);
@@ -2841,14 +2892,14 @@ nir_to_vir(struct v3d_compile *c)
*/
if (c->fs_key->is_points &&
(c->devinfo->ver < 40 || program_reads_point_coord(c))) {
c->point_x = emit_fragment_varying(c, NULL, 0, 0);
c->point_y = emit_fragment_varying(c, NULL, 0, 0);
c->point_x = emit_fragment_varying(c, NULL, -1, 0, 0);
c->point_y = emit_fragment_varying(c, NULL, -1, 0, 0);
c->uses_implicit_point_line_varyings = true;
} else if (c->fs_key->is_lines &&
(c->devinfo->ver < 40 ||
(c->s->info.system_values_read &
BITFIELD64_BIT(SYSTEM_VALUE_LINE_COORD)))) {
c->line_x = emit_fragment_varying(c, NULL, 0, 0);
c->line_x = emit_fragment_varying(c, NULL, -1, 0, 0);
c->uses_implicit_point_line_varyings = true;
}

15
src/broadcom/compiler/v3d_compiler.h
View File

@@ -525,6 +525,17 @@ struct v3d_compiler {
unsigned int reg_class_phys_or_acc[3];
};
/**
* This holds partially interpolated inputs as provided by hardware
* (The Vp = A*(x - x0) + B*(y - y0) term), as well as the C coefficient
* required to compute the final interpolated value.
*/
struct v3d_interp_input {
struct qreg vp;
struct qreg C;
unsigned mode; /* interpolation mode */
};
struct v3d_compile {
const struct v3d_device_info *devinfo;
nir_shader *s;
@@ -552,6 +563,10 @@ struct v3d_compile {
* Not all fragment shader QFILE_VARY reads are present in this array.
*/
struct qreg *inputs;
/**
* Partially interpolated inputs to the shader.
*/
struct v3d_interp_input *interp;
struct qreg *outputs;
bool msaa_per_sample_output;
struct qreg color_reads[V3D_MAX_DRAW_BUFFERS * V3D_MAX_SAMPLES * 4];