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mesa/src/panfrost/lib/pan_blend.c

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/*
* Copyright (C) 2018 Alyssa Rosenzweig
* Copyright (C) 2019-2021 Collabora, Ltd.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "pan_blend.h"
#include "util/blend.h"
#ifdef PAN_ARCH
#include "pan_shader.h"
#endif
#include "compiler/nir/nir.h"
#include "compiler/nir/nir_builder.h"
#include "compiler/nir/nir_conversion_builder.h"
#include "compiler/nir/nir_lower_blend.h"
#include "panfrost/util/pan_lower_framebuffer.h"
#include "util/format/u_format.h"
#include "pan_texture.h"
#ifndef PAN_ARCH
/* Fixed function blending */
static bool
factor_is_supported(enum pipe_blendfactor factor)
{
factor = util_blendfactor_without_invert(factor);
return factor != PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE &&
factor != PIPE_BLENDFACTOR_SRC1_COLOR &&
factor != PIPE_BLENDFACTOR_SRC1_ALPHA;
}
/* OpenGL allows encoding (src*dest + dest*src) which is incompatiblle with
* Midgard style blending since there are two multiplies. However, it may be
* factored as 2*src*dest = dest*(2*src), which can be encoded on Bifrost as 0
* + dest * (2*src) wih the new source_2 value of C. Detect this case. */
static bool
is_2srcdest(enum pipe_blend_func blend_func, enum pipe_blendfactor src_factor,
enum pipe_blendfactor dest_factor, bool is_alpha)
{
return (blend_func == PIPE_BLEND_ADD) &&
((src_factor == PIPE_BLENDFACTOR_DST_COLOR) ||
((src_factor == PIPE_BLENDFACTOR_DST_ALPHA) && is_alpha)) &&
((dest_factor == PIPE_BLENDFACTOR_SRC_COLOR) ||
((dest_factor == PIPE_BLENDFACTOR_SRC_ALPHA) && is_alpha));
}
static bool
can_fixed_function_equation(enum pipe_blend_func blend_func,
enum pipe_blendfactor src_factor,
enum pipe_blendfactor dest_factor, bool is_alpha,
bool supports_2src)
{
if (is_2srcdest(blend_func, src_factor, dest_factor, is_alpha))
return supports_2src;
if (blend_func != PIPE_BLEND_ADD && blend_func != PIPE_BLEND_SUBTRACT &&
blend_func != PIPE_BLEND_REVERSE_SUBTRACT)
return false;
if (!factor_is_supported(src_factor) || !factor_is_supported(dest_factor))
return false;
/* Fixed function requires src/dest factors to match (up to invert) or be
* zero/one.
*/
enum pipe_blendfactor src = util_blendfactor_without_invert(src_factor);
enum pipe_blendfactor dest = util_blendfactor_without_invert(dest_factor);
return (src == dest) || (src == PIPE_BLENDFACTOR_ONE) ||
(dest == PIPE_BLENDFACTOR_ONE);
}
static unsigned
blend_factor_constant_mask(enum pipe_blendfactor factor)
{
factor = util_blendfactor_without_invert(factor);
if (factor == PIPE_BLENDFACTOR_CONST_COLOR)
return 0b0111; /* RGB */
else if (factor == PIPE_BLENDFACTOR_CONST_ALPHA)
return 0b1000; /* A */
else
return 0b0000; /* - */
}
unsigned
pan_blend_constant_mask(const struct pan_blend_equation eq)
{
return blend_factor_constant_mask(eq.rgb_src_factor) |
blend_factor_constant_mask(eq.rgb_dst_factor) |
blend_factor_constant_mask(eq.alpha_src_factor) |
blend_factor_constant_mask(eq.alpha_dst_factor);
}
/* Only "homogenous" (scalar or vector with all components equal) constants are
* valid for fixed-function, so check for this condition */
bool
pan_blend_is_homogenous_constant(unsigned mask, const float *constants)
{
float constant = pan_blend_get_constant(mask, constants);
u_foreach_bit(i, mask) {
if (constants[i] != constant)
return false;
}
return true;
}
/* Determines if an equation can run in fixed function */
bool
pan_blend_can_fixed_function(const struct pan_blend_equation equation,
bool supports_2src)
{
return !equation.blend_enable ||
(can_fixed_function_equation(
equation.rgb_func, equation.rgb_src_factor,
equation.rgb_dst_factor, false, supports_2src) &&
can_fixed_function_equation(
equation.alpha_func, equation.alpha_src_factor,
equation.alpha_dst_factor, true, supports_2src));
}
static enum mali_blend_operand_c
to_c_factor(enum pipe_blendfactor factor)
{
switch (util_blendfactor_without_invert(factor)) {
case PIPE_BLENDFACTOR_ONE:
/* Extra invert to flip back in caller */
return MALI_BLEND_OPERAND_C_ZERO;
case PIPE_BLENDFACTOR_SRC_ALPHA:
return MALI_BLEND_OPERAND_C_SRC_ALPHA;
case PIPE_BLENDFACTOR_DST_ALPHA:
return MALI_BLEND_OPERAND_C_DEST_ALPHA;
case PIPE_BLENDFACTOR_SRC_COLOR:
return MALI_BLEND_OPERAND_C_SRC;
case PIPE_BLENDFACTOR_DST_COLOR:
return MALI_BLEND_OPERAND_C_DEST;
case PIPE_BLENDFACTOR_CONST_COLOR:
case PIPE_BLENDFACTOR_CONST_ALPHA:
return MALI_BLEND_OPERAND_C_CONSTANT;
default:
unreachable("Unsupported blend factor");
}
}
static void
to_panfrost_function(enum pipe_blend_func blend_func,
enum pipe_blendfactor src_factor,
enum pipe_blendfactor dest_factor, bool is_alpha,
struct MALI_BLEND_FUNCTION *function)
{
assert(can_fixed_function_equation(blend_func, src_factor, dest_factor,
is_alpha, true));
/* We handle ZERO/ONE specially since it's the hardware has 0 and can invert
* to 1 but Gallium has 0 as the uninverted version.
*/
bool src_inverted =
util_blendfactor_is_inverted(src_factor) ^
(util_blendfactor_without_invert(src_factor) == PIPE_BLENDFACTOR_ONE);
bool dest_inverted =
util_blendfactor_is_inverted(dest_factor) ^
(util_blendfactor_without_invert(dest_factor) == PIPE_BLENDFACTOR_ONE);
if (src_factor == PIPE_BLENDFACTOR_ZERO) {
function->a = MALI_BLEND_OPERAND_A_ZERO;
function->b = MALI_BLEND_OPERAND_B_DEST;
if (blend_func == PIPE_BLEND_SUBTRACT)
function->negate_b = true;
function->invert_c = dest_inverted;
function->c = to_c_factor(dest_factor);
} else if (src_factor == PIPE_BLENDFACTOR_ONE) {
function->a = MALI_BLEND_OPERAND_A_SRC;
function->b = MALI_BLEND_OPERAND_B_DEST;
if (blend_func == PIPE_BLEND_SUBTRACT)
function->negate_b = true;
else if (blend_func == PIPE_BLEND_REVERSE_SUBTRACT)
function->negate_a = true;
function->invert_c = dest_inverted;
function->c = to_c_factor(dest_factor);
} else if (dest_factor == PIPE_BLENDFACTOR_ZERO) {
function->a = MALI_BLEND_OPERAND_A_ZERO;
function->b = MALI_BLEND_OPERAND_B_SRC;
if (blend_func == PIPE_BLEND_REVERSE_SUBTRACT)
function->negate_b = true;
function->invert_c = src_inverted;
function->c = to_c_factor(src_factor);
} else if (dest_factor == PIPE_BLENDFACTOR_ONE) {
function->a = MALI_BLEND_OPERAND_A_DEST;
function->b = MALI_BLEND_OPERAND_B_SRC;
if (blend_func == PIPE_BLEND_SUBTRACT)
function->negate_a = true;
else if (blend_func == PIPE_BLEND_REVERSE_SUBTRACT)
function->negate_b = true;
function->invert_c = src_inverted;
function->c = to_c_factor(src_factor);
} else if (src_factor == dest_factor) {
function->a = MALI_BLEND_OPERAND_A_ZERO;
function->invert_c = src_inverted;
function->c = to_c_factor(src_factor);
switch (blend_func) {
case PIPE_BLEND_ADD:
function->b = MALI_BLEND_OPERAND_B_SRC_PLUS_DEST;
break;
case PIPE_BLEND_REVERSE_SUBTRACT:
function->negate_b = true;
FALLTHROUGH;
case PIPE_BLEND_SUBTRACT:
function->b = MALI_BLEND_OPERAND_B_SRC_MINUS_DEST;
break;
default:
unreachable("Invalid blend function");
}
} else if (is_2srcdest(blend_func, src_factor, dest_factor, is_alpha)) {
/* src*dest + dest*src = 2*src*dest = 0 + dest*(2*src) */
function->a = MALI_BLEND_OPERAND_A_ZERO;
function->b = MALI_BLEND_OPERAND_B_DEST;
function->c = MALI_BLEND_OPERAND_C_SRC_X_2;
} else {
assert(util_blendfactor_without_invert(src_factor) ==
util_blendfactor_without_invert(dest_factor) &&
src_inverted != dest_inverted);
function->a = MALI_BLEND_OPERAND_A_DEST;
function->invert_c = src_inverted;
function->c = to_c_factor(src_factor);
switch (blend_func) {
case PIPE_BLEND_ADD:
function->b = MALI_BLEND_OPERAND_B_SRC_MINUS_DEST;
break;
case PIPE_BLEND_REVERSE_SUBTRACT:
function->b = MALI_BLEND_OPERAND_B_SRC_PLUS_DEST;
function->negate_b = true;
break;
case PIPE_BLEND_SUBTRACT:
function->b = MALI_BLEND_OPERAND_B_SRC_PLUS_DEST;
function->negate_a = true;
break;
default:
unreachable("Invalid blend function\n");
}
}
}
bool
pan_blend_is_opaque(const struct pan_blend_equation equation)
{
/* If a channel is masked out, we can't use opaque mode even if
* blending is disabled, since we need a tilebuffer read in there */
if (equation.color_mask != 0xF)
return false;
/* With nothing masked out, disabled bledning is opaque */
if (!equation.blend_enable)
return true;
/* Also detect open-coded opaque blending */
return equation.rgb_src_factor == PIPE_BLENDFACTOR_ONE &&
equation.rgb_dst_factor == PIPE_BLENDFACTOR_ZERO &&
(equation.rgb_func == PIPE_BLEND_ADD ||
equation.rgb_func == PIPE_BLEND_SUBTRACT) &&
equation.alpha_src_factor == PIPE_BLENDFACTOR_ONE &&
equation.alpha_dst_factor == PIPE_BLENDFACTOR_ZERO &&
(equation.alpha_func == PIPE_BLEND_ADD ||
equation.alpha_func == PIPE_BLEND_SUBTRACT);
}
/* Check if a factor represents a constant value of val, assuming src_alpha is
* the given constant.
*/
static inline bool
is_factor_01(enum pipe_blendfactor factor, unsigned val, unsigned srca)
{
assert(val == 0 || val == 1);
assert(srca == 0 || srca == 1);
switch (factor) {
case PIPE_BLENDFACTOR_ZERO:
return (val == 0);
case PIPE_BLENDFACTOR_ONE:
return (val == 1);
case PIPE_BLENDFACTOR_SRC_ALPHA:
return (val == srca);
case PIPE_BLENDFACTOR_INV_SRC_ALPHA:
return (val == (1 - srca));
default:
return false;
}
}
/* Returns if src alpha = 0 implies the blended colour equals the destination
* colour. Suppose source alpha = 0 and consider cases.
*
* Additive blending: Equivalent to D = S * f_s + D * f_d for all D and all S
* with S_a = 0, for each component. For the alpha component (if it unmasked),
* we have S_a = 0 so this reduces to D = D * f_d <===> f_d = 1. For RGB
* components (if unmasked), we need f_s = 0 and f_d = 1.
*
* Subtractive blending: Fails in general (D = S * f_S - D * f_D). We
* would need f_S = 0 and f_D = -1, which is not valid in the APIs.
*
* Reverse subtractive blending (D = D * f_D - S * f_S), we need f_D = 1
* and f_S = 0 up to masking. This is the same as additive blending.
*
* Min/max: Fails in general on the RGB components.
*/
bool
pan_blend_alpha_zero_nop(const struct pan_blend_equation eq)
{
if (eq.rgb_func != PIPE_BLEND_ADD &&
eq.rgb_func != PIPE_BLEND_REVERSE_SUBTRACT)
return false;
if (eq.color_mask & 0x8) {
if (!is_factor_01(eq.alpha_dst_factor, 1, 0))
return false;
}
if (eq.color_mask & 0x7) {
if (!is_factor_01(eq.rgb_dst_factor, 1, 0))
return false;
if (!is_factor_01(eq.rgb_src_factor, 0, 0))
return false;
}
return true;
}
/* Returns if src alpha = 1 implies the blended colour equals the source
* colour. Suppose source alpha = 1 and consider cases.
*
* Additive blending: S = S * f_s + D * f_d. We need f_s = 1 and f_d = 0.
*
* Subtractive blending: S = S * f_s - D * f_d. Same as additive blending.
*
* Reverse subtractive blending: S = D * f_d - S * f_s. Fails in general since
* it would require f_s = -1, which is not valid in the APIs.
*
* Min/max: Fails in general on the RGB components.
*
* Note if any component is masked, we can't use a store.
*/
bool
pan_blend_alpha_one_store(const struct pan_blend_equation eq)
{
if (eq.rgb_func != PIPE_BLEND_ADD && eq.rgb_func != PIPE_BLEND_SUBTRACT)
return false;
if (eq.color_mask != 0xf)
return false;
return is_factor_01(eq.rgb_src_factor, 1, 1) &&
is_factor_01(eq.alpha_src_factor, 1, 1) &&
is_factor_01(eq.rgb_dst_factor, 0, 1) &&
is_factor_01(eq.alpha_dst_factor, 0, 1);
}
static bool
is_dest_factor(enum pipe_blendfactor factor, bool alpha)
{
factor = util_blendfactor_without_invert(factor);
return factor == PIPE_BLENDFACTOR_DST_ALPHA ||
factor == PIPE_BLENDFACTOR_DST_COLOR ||
(factor == PIPE_BLENDFACTOR_SRC_ALPHA_SATURATE && !alpha);
}
/* Determines if a blend equation reads back the destination. This can occur by
* explicitly referencing the destination in the blend equation, or by using a
* partial writemask. */
bool
pan_blend_reads_dest(const struct pan_blend_equation equation)
{
if (equation.color_mask && equation.color_mask != 0xF)
return true;
if (!equation.blend_enable)
return false;
return is_dest_factor(equation.rgb_src_factor, false) ||
is_dest_factor(equation.alpha_src_factor, true) ||
equation.rgb_dst_factor != PIPE_BLENDFACTOR_ZERO ||
equation.alpha_dst_factor != PIPE_BLENDFACTOR_ZERO;
}
/* Create the descriptor for a fixed blend mode given the corresponding API
* state. Assumes the equation can be represented as fixed-function. */
void
pan_blend_to_fixed_function_equation(const struct pan_blend_equation equation,
struct MALI_BLEND_EQUATION *out)
{
/* If no blending is enabled, default back on `replace` mode */
if (!equation.blend_enable) {
out->color_mask = equation.color_mask;
out->rgb.a = MALI_BLEND_OPERAND_A_SRC;
out->rgb.b = MALI_BLEND_OPERAND_B_SRC;
out->rgb.c = MALI_BLEND_OPERAND_C_ZERO;
out->alpha.a = MALI_BLEND_OPERAND_A_SRC;
out->alpha.b = MALI_BLEND_OPERAND_B_SRC;
out->alpha.c = MALI_BLEND_OPERAND_C_ZERO;
return;
}
/* Compile the fixed-function blend */
to_panfrost_function(equation.rgb_func, equation.rgb_src_factor,
equation.rgb_dst_factor, false, &out->rgb);
to_panfrost_function(equation.alpha_func, equation.alpha_src_factor,
equation.alpha_dst_factor, true, &out->alpha);
out->color_mask = equation.color_mask;
}
uint32_t
pan_pack_blend(const struct pan_blend_equation equation)
{
STATIC_ASSERT(sizeof(uint32_t) == MALI_BLEND_EQUATION_LENGTH);
uint32_t out = 0;
pan_pack(&out, BLEND_EQUATION, cfg) {
pan_blend_to_fixed_function_equation(equation, &cfg);
}
return out;
}
DERIVE_HASH_TABLE(pan_blend_shader_key);
void
pan_blend_shader_cache_init(struct pan_blend_shader_cache *cache,
unsigned gpu_id)
{
cache->gpu_id = gpu_id;
cache->shaders = pan_blend_shader_key_table_create(NULL);
pthread_mutex_init(&cache->lock, NULL);
}
void
pan_blend_shader_cache_cleanup(struct pan_blend_shader_cache *cache)
{
_mesa_hash_table_destroy(cache->shaders, NULL);
pthread_mutex_destroy(&cache->lock);
}
#else /* ifndef PAN_ARCH */
static const char *
logicop_str(enum pipe_logicop logicop)
{
switch (logicop) {
case PIPE_LOGICOP_CLEAR:
return "clear";
case PIPE_LOGICOP_NOR:
return "nor";
case PIPE_LOGICOP_AND_INVERTED:
return "and-inverted";
case PIPE_LOGICOP_COPY_INVERTED:
return "copy-inverted";
case PIPE_LOGICOP_AND_REVERSE:
return "and-reverse";
case PIPE_LOGICOP_INVERT:
return "invert";
case PIPE_LOGICOP_XOR:
return "xor";
case PIPE_LOGICOP_NAND:
return "nand";
case PIPE_LOGICOP_AND:
return "and";
case PIPE_LOGICOP_EQUIV:
return "equiv";
case PIPE_LOGICOP_NOOP:
return "noop";
case PIPE_LOGICOP_OR_INVERTED:
return "or-inverted";
case PIPE_LOGICOP_COPY:
return "copy";
case PIPE_LOGICOP_OR_REVERSE:
return "or-reverse";
case PIPE_LOGICOP_OR:
return "or";
case PIPE_LOGICOP_SET:
return "set";
default:
unreachable("Invalid logicop\n");
}
}
static void
get_equation_str(const struct pan_blend_rt_state *rt_state, char *str,
unsigned len)
{
const char *funcs[] = {
"add", "sub", "reverse_sub", "min", "max",
};
const char *factors[] = {
"", "one", "src_color", "src_alpha", "dst_alpha",
"dst_color", "src_alpha_sat", "const_color", "const_alpha", "src1_color",
"src1_alpha",
};
int ret;
if (!rt_state->equation.blend_enable) {
ret = snprintf(str, len, "replace(%s%s%s%s)",
(rt_state->equation.color_mask & 1) ? "R" : "",
(rt_state->equation.color_mask & 2) ? "G" : "",
(rt_state->equation.color_mask & 4) ? "B" : "",
(rt_state->equation.color_mask & 8) ? "A" : "");
assert(ret > 0);
return;
}
if (rt_state->equation.color_mask & 7) {
assert(rt_state->equation.rgb_func < ARRAY_SIZE(funcs));
ret = snprintf(
str, len, "%s%s%s(func=%s,src_factor=%s%s,dst_factor=%s%s)%s",
(rt_state->equation.color_mask & 1) ? "R" : "",
(rt_state->equation.color_mask & 2) ? "G" : "",
(rt_state->equation.color_mask & 4) ? "B" : "",
funcs[rt_state->equation.rgb_func],
util_blendfactor_is_inverted(rt_state->equation.rgb_src_factor) ? "-"
: "",
factors[util_blendfactor_without_invert(
rt_state->equation.rgb_src_factor)],
util_blendfactor_is_inverted(rt_state->equation.rgb_dst_factor) ? "-"
: "",
factors[util_blendfactor_without_invert(
rt_state->equation.rgb_dst_factor)],
rt_state->equation.color_mask & 8 ? ";" : "");
assert(ret > 0);
str += ret;
len -= ret;
}
if (rt_state->equation.color_mask & 8) {
assert(rt_state->equation.alpha_func < ARRAY_SIZE(funcs));
ret = snprintf(
str, len, "A(func=%s,src_factor=%s%s,dst_factor=%s%s)",
funcs[rt_state->equation.alpha_func],
util_blendfactor_is_inverted(rt_state->equation.alpha_src_factor) ? "-"
: "",
factors[util_blendfactor_without_invert(
rt_state->equation.alpha_src_factor)],
util_blendfactor_is_inverted(rt_state->equation.alpha_dst_factor) ? "-"
: "",
factors[util_blendfactor_without_invert(
rt_state->equation.alpha_dst_factor)]);
assert(ret > 0);
str += ret;
len -= ret;
}
}
static bool
pan_inline_blend_constants(nir_builder *b, nir_intrinsic_instr *intr,
void *data)
{
if (intr->intrinsic != nir_intrinsic_load_blend_const_color_rgba)
return false;
float *floats = data;
const nir_const_value constants[4] = {
nir_const_value_for_float(floats[0], 32),
nir_const_value_for_float(floats[1], 32),
nir_const_value_for_float(floats[2], 32),
nir_const_value_for_float(floats[3], 32)};
b->cursor = nir_after_instr(&intr->instr);
nir_def *constant = nir_build_imm(b, 4, 32, constants);
nir_def_rewrite_uses(&intr->def, constant);
nir_instr_remove(&intr->instr);
return true;
}
nir_shader *
GENX(pan_blend_create_shader)(const struct pan_blend_state *state,
nir_alu_type src0_type, nir_alu_type src1_type,
unsigned rt)
{
const struct pan_blend_rt_state *rt_state = &state->rts[rt];
char equation_str[128] = {0};
get_equation_str(rt_state, equation_str, sizeof(equation_str));
nir_builder b = nir_builder_init_simple_shader(
MESA_SHADER_FRAGMENT, GENX(pan_shader_get_compiler_options)(),
"pan_blend(rt=%d,fmt=%s,nr_samples=%d,%s=%s)", rt,
util_format_name(rt_state->format), rt_state->nr_samples,
state->logicop_enable ? "logicop" : "equation",
state->logicop_enable ? logicop_str(state->logicop_func) : equation_str);
const struct util_format_description *format_desc =
util_format_description(rt_state->format);
nir_alu_type nir_type = pan_unpacked_type_for_format(format_desc);
/* Bifrost/Valhall support 16-bit and 32-bit register formats for
* LD_TILE/ST_TILE/BLEND, but do not support 8-bit. Rather than making
* the fragment output 8-bit and inserting extra conversions in the
* compiler, promote the output to 16-bit. The larger size is still
* compatible with correct conversion semantics.
*/
if (PAN_ARCH >= 6 && nir_alu_type_get_type_size(nir_type) == 8)
nir_type = nir_alu_type_get_base_type(nir_type) | 16;
nir_lower_blend_options options = {
.logicop_enable = state->logicop_enable,
.logicop_func = state->logicop_func,
};
options.rt[rt].colormask = rt_state->equation.color_mask;
options.format[rt] = rt_state->format;
if (!rt_state->equation.blend_enable) {
static const nir_lower_blend_channel replace = {
.func = PIPE_BLEND_ADD,
.src_factor = PIPE_BLENDFACTOR_ONE,
.dst_factor = PIPE_BLENDFACTOR_ZERO,
};
options.rt[rt].rgb = replace;
options.rt[rt].alpha = replace;
} else {
options.rt[rt].rgb.func = rt_state->equation.rgb_func;
options.rt[rt].rgb.src_factor = rt_state->equation.rgb_src_factor;
options.rt[rt].rgb.dst_factor = rt_state->equation.rgb_dst_factor;
options.rt[rt].alpha.func = rt_state->equation.alpha_func;
options.rt[rt].alpha.src_factor = rt_state->equation.alpha_src_factor;
options.rt[rt].alpha.dst_factor = rt_state->equation.alpha_dst_factor;
}
nir_def *pixel = nir_load_barycentric_pixel(&b, 32, .interp_mode = 1);
nir_def *zero = nir_imm_int(&b, 0);
for (unsigned i = 0; i < 2; ++i) {
nir_alu_type src_type =
(i == 1 ? src1_type : src0_type) ?: nir_type_float32;
/* HACK: workaround buggy TGSI shaders (u_blitter) */
src_type = nir_alu_type_get_base_type(nir_type) |
nir_alu_type_get_type_size(src_type);
nir_def *src = nir_load_interpolated_input(
&b, 4, nir_alu_type_get_type_size(src_type), pixel, zero,
.io_semantics.location = i ? VARYING_SLOT_VAR0 : VARYING_SLOT_COL0,
.io_semantics.num_slots = 1, .base = i, .dest_type = src_type);
/* On Midgard, the blend shader is responsible for format conversion.
* As the OpenGL spec requires integer conversions to saturate, we must
* saturate ourselves here. On Bifrost and later, the conversion
* hardware handles this automatically.
*/
nir_alu_type T = nir_alu_type_get_base_type(nir_type);
bool should_saturate = (PAN_ARCH <= 5) && (T != nir_type_float);
src = nir_convert_with_rounding(&b, src, T, nir_type,
nir_rounding_mode_undef, should_saturate);
nir_store_output(&b, src, zero, .write_mask = BITFIELD_MASK(4),
.src_type = nir_type,
.io_semantics.location = FRAG_RESULT_DATA0 + rt,
.io_semantics.num_slots = 1,
.io_semantics.dual_source_blend_index = i);
}
b.shader->info.io_lowered = true;
NIR_PASS_V(b.shader, nir_lower_blend, &options);
return b.shader;
}
#if PAN_ARCH >= 6
uint64_t
GENX(pan_blend_get_internal_desc)(enum pipe_format fmt, unsigned rt,
unsigned force_size, bool dithered)
{
const struct util_format_description *desc = util_format_description(fmt);
uint64_t res;
pan_pack(&res, INTERNAL_BLEND, cfg) {
cfg.mode = MALI_BLEND_MODE_OPAQUE;
cfg.fixed_function.num_comps = desc->nr_channels;
cfg.fixed_function.rt = rt;
nir_alu_type T = pan_unpacked_type_for_format(desc);
if (force_size)
T = nir_alu_type_get_base_type(T) | force_size;
switch (T) {
case nir_type_float16:
cfg.fixed_function.conversion.register_format =
MALI_REGISTER_FILE_FORMAT_F16;
break;
case nir_type_float32:
cfg.fixed_function.conversion.register_format =
MALI_REGISTER_FILE_FORMAT_F32;
break;
case nir_type_int8:
case nir_type_int16:
cfg.fixed_function.conversion.register_format =
MALI_REGISTER_FILE_FORMAT_I16;
break;
case nir_type_int32:
cfg.fixed_function.conversion.register_format =
MALI_REGISTER_FILE_FORMAT_I32;
break;
case nir_type_uint8:
case nir_type_uint16:
cfg.fixed_function.conversion.register_format =
MALI_REGISTER_FILE_FORMAT_U16;
break;
case nir_type_uint32:
cfg.fixed_function.conversion.register_format =
MALI_REGISTER_FILE_FORMAT_U32;
break;
default:
unreachable("Invalid format");
}
cfg.fixed_function.conversion.memory_format =
GENX(panfrost_dithered_format_from_pipe_format)(fmt, dithered);
}
return res;
}
static bool
inline_rt_conversion(nir_builder *b, nir_intrinsic_instr *intr, void *data)
{
if (intr->intrinsic != nir_intrinsic_load_rt_conversion_pan)
return false;
enum pipe_format *formats = data;
unsigned rt = nir_intrinsic_base(intr);
unsigned size = nir_alu_type_get_type_size(nir_intrinsic_src_type(intr));
uint64_t conversion =
GENX(pan_blend_get_internal_desc)(formats[rt], rt, size, false);
b->cursor = nir_after_instr(&intr->instr);
nir_def_rewrite_uses(&intr->def, nir_imm_int(b, conversion >> 32));
return true;
}
bool
GENX(pan_inline_rt_conversion)(nir_shader *s, enum pipe_format *formats)
{
return nir_shader_intrinsics_pass(
s, inline_rt_conversion,
nir_metadata_block_index | nir_metadata_dominance, formats);
}
#endif
struct pan_blend_shader_variant *
GENX(pan_blend_get_shader_locked)(struct pan_blend_shader_cache *cache,
const struct pan_blend_state *state,
nir_alu_type src0_type,
nir_alu_type src1_type, unsigned rt)
{
struct pan_blend_shader_key key = {
.format = state->rts[rt].format,
.src0_type = src0_type,
.src1_type = src1_type,
.rt = rt,
.has_constants = pan_blend_constant_mask(state->rts[rt].equation) != 0,
.logicop_enable = state->logicop_enable,
.logicop_func = state->logicop_func,
.nr_samples = state->rts[rt].nr_samples,
.equation = state->rts[rt].equation,
};
/* Blend shaders should only be used for blending on Bifrost onwards */
assert(PAN_ARCH <= 5 || state->logicop_enable ||
!pan_blend_is_opaque(state->rts[rt].equation));
assert(state->rts[rt].equation.color_mask != 0);
struct hash_entry *he =
_mesa_hash_table_search(cache->shaders, &key);
struct pan_blend_shader *shader = he ? he->data : NULL;
if (!shader) {
shader = rzalloc(cache->shaders, struct pan_blend_shader);
shader->key = key;
list_inithead(&shader->variants);
_mesa_hash_table_insert(cache->shaders, &shader->key, shader);
}
list_for_each_entry(struct pan_blend_shader_variant, iter, &shader->variants,
node) {
if (!key.has_constants ||
!memcmp(iter->constants, state->constants, sizeof(iter->constants))) {
return iter;
}
}
struct pan_blend_shader_variant *variant = NULL;
if (shader->nvariants < PAN_BLEND_SHADER_MAX_VARIANTS) {
variant = rzalloc(shader, struct pan_blend_shader_variant);
util_dynarray_init(&variant->binary, variant);
list_add(&variant->node, &shader->variants);
shader->nvariants++;
} else {
variant = list_last_entry(&shader->variants,
struct pan_blend_shader_variant, node);
list_del(&variant->node);
list_add(&variant->node, &shader->variants);
util_dynarray_clear(&variant->binary);
}
memcpy(variant->constants, state->constants, sizeof(variant->constants));
nir_shader *nir =
GENX(pan_blend_create_shader)(state, src0_type, src1_type, rt);
nir_shader_intrinsics_pass(nir, pan_inline_blend_constants,
nir_metadata_block_index | nir_metadata_dominance,
(void *)state->constants);
/* Compile the NIR shader */
struct panfrost_compile_inputs inputs = {
.gpu_id = cache->gpu_id,
.is_blend = true,
.blend.nr_samples = key.nr_samples,
};
enum pipe_format rt_formats[8] = {0};
rt_formats[rt] = key.format;
#if PAN_ARCH >= 6
inputs.blend.bifrost_blend_desc =
GENX(pan_blend_get_internal_desc)(key.format, key.rt, 0, false);
#endif
struct pan_shader_info info;
pan_shader_preprocess(nir, inputs.gpu_id);
#if PAN_ARCH >= 6
NIR_PASS_V(nir, GENX(pan_inline_rt_conversion), rt_formats);
#else
NIR_PASS_V(nir, pan_lower_framebuffer, rt_formats,
pan_raw_format_mask_midgard(rt_formats), MAX2(key.nr_samples, 1),
cache->gpu_id < 0x700);
#endif
GENX(pan_shader_compile)(nir, &inputs, &variant->binary, &info);
variant->work_reg_count = info.work_reg_count;
#if PAN_ARCH <= 5
variant->first_tag = info.midgard.first_tag;
#endif
ralloc_free(nir);
return variant;
}
#endif /* ifndef PAN_ARCH */
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