/**
* Create a texture handle from a texture unit.
*/
static GLuint64
st_create_texture_handle_from_unit(struct st_context *st,
struct gl_program *prog, GLuint texUnit)
{
struct pipe_context *pipe = st->pipe;
struct pipe_sampler_view *view;
struct pipe_sampler_state sampler = {0};
st_update_single_texture(st, &view, texUnit, prog->sh.data->Version >= 130);
if (!view)
return 0;
if (view->target != PIPE_BUFFER)
st_convert_sampler_from_unit(st, &sampler, texUnit);
assert(st->ctx->Texture.Unit[texUnit]._Current);
return pipe->create_texture_handle(pipe, view, &sampler);
}
static void
update_textures(struct st_context *st,
enum pipe_shader_type shader_stage,
const struct gl_program *prog,
struct pipe_sampler_view **sampler_views,
unsigned *out_num_textures)
{
const GLuint old_max = *out_num_textures;
GLbitfield samplers_used = prog->SamplersUsed;
GLbitfield texel_fetch_samplers = prog->info.textures_used_by_txf;
GLbitfield free_slots = ~prog->SamplersUsed;
GLbitfield external_samplers_used = prog->ExternalSamplersUsed;
GLuint unit;
if (samplers_used == 0x0 && old_max == 0)
return;
unsigned num_textures = 0;
/* prog->sh.data is NULL if it's ARB_fragment_program */
bool glsl130 = (prog->sh.data ? prog->sh.data->Version : 0) >= 130;
/* loop over sampler units (aka tex image units) */
for (unit = 0; samplers_used || unit < old_max;
unit++, samplers_used >>= 1, texel_fetch_samplers >>= 1) {
struct pipe_sampler_view *sampler_view = NULL;
if (samplers_used & 1) {
const GLuint texUnit = prog->SamplerUnits[unit];
/* The EXT_texture_sRGB_decode extension says:
*
* "The conversion of sRGB color space components to linear color
* space is always performed if the texel lookup function is one
* of the texelFetch builtin functions.
*
* Otherwise, if the texel lookup function is one of the texture
* builtin functions or one of the texture gather functions, the
* conversion of sRGB color space components to linear color space
* is controlled by the TEXTURE_SRGB_DECODE_EXT parameter.
*
* If the TEXTURE_SRGB_DECODE_EXT parameter is DECODE_EXT, the
* conversion of sRGB color space components to linear color space
* is performed.
*
* If the TEXTURE_SRGB_DECODE_EXT parameter is SKIP_DECODE_EXT,
* the value is returned without decoding. However, if the texture
* is also [statically] accessed with a texelFetch function, then
* the result of texture builtin functions and/or texture gather
* functions may be returned with decoding or without decoding."
*
* Note: the "statically" will be added to the language per
* https://cvs.khronos.org/bugzilla/show_bug.cgi?id=14934
*
* So we simply ignore the setting entirely for samplers that are
* (statically) accessed with a texelFetch function.
*/
st_update_single_texture(st, &sampler_view, texUnit, glsl130,
texel_fetch_samplers & 1);
num_textures = unit + 1;
}
pipe_sampler_view_reference(&(sampler_views[unit]), sampler_view);
}
/* For any external samplers with multiplaner YUV, stuff the additional
* sampler views we need at the end.
*
* Trying to cache the sampler view in the stObj looks painful, so just
* re-create the sampler view for the extra planes each time. Main use
* case is video playback (ie. fps games wouldn't be using this) so I
* guess no point to try to optimize this feature.
*/
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_view tmpl;
if (!stObj)
continue;
/* use original view as template: */
tmpl = *sampler_views[unit];
switch (st_get_view_format(stObj)) {
case PIPE_FORMAT_NV12:
/* we need one additional R8G8 view: */
tmpl.format = PIPE_FORMAT_RG88_UNORM;
tmpl.swizzle_g = PIPE_SWIZZLE_Y; /* tmpl from Y plane is R8 */
extra = u_bit_scan(&free_slots);
sampler_views[extra] =
st->pipe->create_sampler_view(st->pipe, stObj->pt->next, &tmpl);
break;
case PIPE_FORMAT_IYUV:
/* we need two additional R8 views: */
tmpl.format = PIPE_FORMAT_R8_UNORM;
extra = u_bit_scan(&free_slots);
sampler_views[extra] =
st->pipe->create_sampler_view(st->pipe, stObj->pt->next, &tmpl);
extra = u_bit_scan(&free_slots);
sampler_views[extra] =
st->pipe->create_sampler_view(st->pipe, stObj->pt->next->next, &tmpl);
break;
default:
break;
}
num_textures = MAX2(num_textures, extra + 1);
}
cso_set_sampler_views(st->cso_context,
shader_stage,
num_textures,
sampler_views);
*out_num_textures = num_textures;
}
