/**
* Update the gallium driver's sampler state for fragment, vertex or
* geometry shader stage.
*/
static void
update_shader_samplers(struct st_context *st,
unsigned shader_stage,
const struct gl_program *prog,
unsigned max_units,
struct pipe_sampler_state *samplers,
unsigned *num_samplers)
{
GLuint unit;
GLbitfield samplers_used;
const GLuint old_max = *num_samplers;
samplers_used = prog->SamplersUsed;
if (*num_samplers == 0 && samplers_used == 0x0)
return;
*num_samplers = 0;
/* loop over sampler units (aka tex image units) */
for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {
struct pipe_sampler_state *sampler = samplers + unit;
if (samplers_used & 1) {
const GLuint texUnit = prog->SamplerUnits[unit];
convert_sampler(st, sampler, texUnit);
*num_samplers = unit + 1;
cso_single_sampler(st->cso_context, shader_stage, unit, sampler);
}
else if (samplers_used != 0 || unit < old_max) {
cso_single_sampler(st->cso_context, shader_stage, unit, NULL);
}
else {
/* if we've reset all the old samplers and we have no more new ones */
break;
}
}
cso_single_sampler_done(st->cso_context, shader_stage);
}
/**
* Update the gallium driver's sampler state for fragment, vertex or
* geometry shader stage.
*/
static void
update_shader_samplers(struct st_context *st,
enum pipe_shader_type shader_stage,
const struct gl_program *prog,
unsigned max_units,
struct pipe_sampler_state *samplers,
unsigned *num_samplers)
{
GLbitfield samplers_used = prog->SamplersUsed;
GLbitfield free_slots = ~prog->SamplersUsed;
GLbitfield external_samplers_used = prog->ExternalSamplersUsed;
GLuint unit;
const GLuint old_max = *num_samplers;
const struct pipe_sampler_state *states[PIPE_MAX_SAMPLERS];
if (*num_samplers == 0 && samplers_used == 0x0)
return;
*num_samplers = 0;
/* loop over sampler units (aka tex image units) */
for (unit = 0; unit < max_units; unit++, samplers_used >>= 1) {
struct pipe_sampler_state *sampler = samplers + unit;
if (samplers_used & 1) {
const GLuint texUnit = prog->SamplerUnits[unit];
convert_sampler(st, sampler, texUnit);
states[unit] = sampler;
*num_samplers = unit + 1;
}
else if (samplers_used != 0 || unit < old_max) {
states[unit] = NULL;
}
else {
/* if we've reset all the old samplers and we have no more new ones */
break;
}
}
/* For any external samplers with multiplaner YUV, stuff the additional
* sampler states we need at the end.
*
* Just re-use the existing sampler-state from the primary slot.
*/
while (unlikely(external_samplers_used)) {
GLuint unit = u_bit_scan(&external_samplers_used);
GLuint extra = 0;
struct st_texture_object *stObj =
st_get_texture_object(st->ctx, prog, unit);
struct pipe_sampler_state *sampler = samplers + unit;
if (!stObj)
continue;
switch (st_get_view_format(stObj)) {
case PIPE_FORMAT_NV12:
/* we need one additional sampler: */
extra = u_bit_scan(&free_slots);
states[extra] = sampler;
break;
case PIPE_FORMAT_IYUV:
/* we need two additional samplers: */
extra = u_bit_scan(&free_slots);
states[extra] = sampler;
extra = u_bit_scan(&free_slots);
states[extra] = sampler;
break;
default:
break;
}
*num_samplers = MAX2(*num_samplers, extra + 1);
}
cso_set_samplers(st->cso_context, shader_stage, *num_samplers, states);
}