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panfrost: add sysval for number of samples

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Not really used yet, but we will need it later when we change how we
lower multisampled image arrays.

Reviewed-by: Lars-Ivar Hesselberg Simonsen <lars-ivar.simonsen@arm.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40460>
This commit is contained in:
Eric R. Smith 2026-03-24 09:36:22 -03:00 • committed by Marge Bot
parent 54860bb4c7
commit 89288722e7
4 changed files with 32 additions and 0 deletions
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23
src/gallium/drivers/panfrost/pan_cmdstream.c
View file

@ -1110,6 +1110,25 @@ panfrost_upload_txs_sysval(struct panfrost_batch *batch,
}
}
static void
panfrost_upload_image_samples_sysval(struct panfrost_batch *batch,
mesa_shader_stage st,
unsigned int sysvalid,
struct sysval_uniform *uniform)
{
struct panfrost_context *ctx = batch->ctx;
unsigned idx = PAN_SYSVAL_ID_TO_TXS_TEX_IDX(sysvalid);
struct pipe_image_view *image = &ctx->images[st][idx];
if (image->resource->target == PIPE_BUFFER) {
uniform->i[0] = 0;
return;
}
uniform->i[0] = image->resource->nr_samples;
}
static void
panfrost_upload_image_size_sysval(struct panfrost_batch *batch,
mesa_shader_stage st,
@ -1360,6 +1379,10 @@ panfrost_upload_sysvals(struct panfrost_batch *batch, void *ptr_cpu,
panfrost_upload_image_size_sysval(batch, st, PAN_SYSVAL_ID(sysval),
&uniforms[i]);
break;
case PAN_SYSVAL_IMAGE_SAMPLES:
panfrost_upload_image_samples_sysval(batch, st, PAN_SYSVAL_ID(sysval),
&uniforms[i]);
break;
case PAN_SYSVAL_SAMPLE_POSITIONS:
panfrost_upload_sample_positions_sysval(batch, &uniforms[i]);
break;

1
src/gallium/drivers/panfrost/pan_context.h
View file

@ -287,6 +287,7 @@ enum {
PAN_SYSVAL_XFB = 17,
PAN_SYSVAL_NUM_VERTICES = 18,
PAN_SYSVAL_PRINTF_BUFFER = 19,
PAN_SYSVAL_IMAGE_SAMPLES = 20,
};
#define PAN_TXS_SYSVAL_ID(texidx, dim, is_array) \

1
src/gallium/drivers/panfrost/pan_helpers.c
View file

@ -36,6 +36,7 @@ panfrost_analyze_sysvals(struct panfrost_compiled_shader *ss)
break;
case PAN_SYSVAL_IMAGE_SIZE:
case PAN_SYSVAL_IMAGE_SAMPLES:
dirty_shader |= PAN_DIRTY_STAGE_IMAGE;
break;

7
src/gallium/drivers/panfrost/pan_nir_lower_sysvals.c
View file

@ -110,6 +110,13 @@ sysval_for_intrinsic(unsigned arch, nir_intrinsic_instr *intr, unsigned *offset)
return PAN_SYSVAL(RT_CONVERSION, rt | (size << 4));
}
case nir_intrinsic_image_samples: {
uint32_t uindex = nir_src_as_uint(intr->src[0]);
bool is_array = nir_intrinsic_image_array(intr);
unsigned dim = nir_intrinsic_dest_components(intr) - is_array;
return PAN_SYSVAL(IMAGE_SAMPLES, PAN_TXS_SYSVAL_ID(uindex, dim, is_array));
}
case nir_intrinsic_image_size: {
uint32_t uindex = nir_src_as_uint(intr->src[0]);
bool is_array = nir_intrinsic_image_array(intr);