static struct pipe_sampler_view *
st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe,
struct st_texture_object *stObj,
const struct gl_sampler_object *samp,
enum pipe_format format)
{
struct pipe_sampler_view templ;
GLuint swizzle = apply_depthmode(stObj->pt->format,
stObj->base._Swizzle,
samp->DepthMode);
u_sampler_view_default_template(&templ,
stObj->pt,
format);
templ.u.tex.first_level = stObj->base.BaseLevel;
if (swizzle != SWIZZLE_NOOP) {
templ.swizzle_r = GET_SWZ(swizzle, 0);
templ.swizzle_g = GET_SWZ(swizzle, 1);
templ.swizzle_b = GET_SWZ(swizzle, 2);
templ.swizzle_a = GET_SWZ(swizzle, 3);
}
return pipe->create_sampler_view(pipe, stObj->pt, &templ);
}
/**
* Return TRUE if the swizzling described by "swizzle" and
* "depthmode" (for depth textures only) is different from the swizzling
* set in the given sampler view.
*
* \param sv A sampler view.
* \param swizzle Texture swizzle, a bitmask computed using MAKE_SWIZZLE4.
* \param depthmode One of GL_LUMINANCE, GL_INTENSITY, GL_ALPHA.
*/
static boolean
check_sampler_swizzle(struct pipe_sampler_view *sv,
GLuint swizzle, GLenum depthmode)
{
swizzle = apply_depthmode(sv->texture->format, swizzle, depthmode);
if ((sv->swizzle_r != GET_SWZ(swizzle, 0)) ||
(sv->swizzle_g != GET_SWZ(swizzle, 1)) ||
(sv->swizzle_b != GET_SWZ(swizzle, 2)) ||
(sv->swizzle_a != GET_SWZ(swizzle, 3)))
return TRUE;
return FALSE;
}
static struct pipe_sampler_view *
st_create_texture_sampler_view_from_stobj(struct pipe_context *pipe,
struct st_texture_object *stObj,
const struct gl_sampler_object *samp,
enum pipe_format format)
{
struct pipe_sampler_view templ;
GLuint swizzle = apply_depthmode(stObj->pt->format,
stObj->base._Swizzle,
stObj->base.DepthMode);
u_sampler_view_default_template(&templ,
stObj->pt,
format);
if (stObj->pt->target == PIPE_BUFFER) {
unsigned base, size;
unsigned f, n;
const struct util_format_description *desc
= util_format_description(templ.format);
base = stObj->base.BufferOffset;
if (base >= stObj->pt->width0)
return NULL;
size = MIN2(stObj->pt->width0 - base, (unsigned)stObj->base.BufferSize);
f = ((base * 8) / desc->block.bits) * desc->block.width;
n = ((size * 8) / desc->block.bits) * desc->block.width;
if (!n)
return NULL;
templ.u.buf.first_element = f;
templ.u.buf.last_element = f + (n - 1);
} else {
templ.u.tex.first_level = stObj->base.BaseLevel;
}
if (swizzle != SWIZZLE_NOOP) {
templ.swizzle_r = GET_SWZ(swizzle, 0);
templ.swizzle_g = GET_SWZ(swizzle, 1);
templ.swizzle_b = GET_SWZ(swizzle, 2);
templ.swizzle_a = GET_SWZ(swizzle, 3);
}
return pipe->create_sampler_view(pipe, stObj->pt, &templ);
}
