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tgsi: add tgsi_util_get_texture_coord_dim()

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This util function returns the dimension of the texture coordinates for a
texture target, and the location of the shadow reference value.

For example, when the texture target is TGSI_TEXTURE_SHADOW2D, the dimension
of the texture coordinates is 2, and the location of the ref value is 2
(that is, the Z channel).

Signed-off-by: Chia-I Wu <olvaffe@gmail.com>
Acked-by: Roland Scheidegger <sroland@vmware.com>
This commit is contained in:
Chia-I Wu 2013-05-07 15:32:35 +08:00
parent 14a0bb81fe
commit 80857d2c8b
2 changed files with 94 additions and 0 deletions
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91
src/gallium/auxiliary/tgsi/tgsi_util.c
View file

@ -338,3 +338,94 @@ tgsi_util_get_src_from_ind(const struct tgsi_ind_register *reg)
return src;
}
/**
* Return the dimension of the texture coordinates (layer included for array
* textures), as well as the location of the shadow reference value or the
* sample index.
*/
int
tgsi_util_get_texture_coord_dim(int tgsi_tex, int *shadow_or_sample)
{
int dim;
/*
* Depending on the texture target, (src0.xyzw, src1.x) is interpreted
* differently:
*
* (s, X, X, X, X), for 1D
* (s, t, X, X, X), for 2D, RECT
* (s, t, r, X, X), for 3D, CUBE
*
* (s, layer, X, X, X), for 1D_ARRAY
* (s, t, layer, X, X), for 2D_ARRAY
* (s, t, r, layer, X), for CUBE_ARRAY
*
* (s, X, shadow, X, X), for SHADOW1D
* (s, t, shadow, X, X), for SHADOW2D, SHADOWRECT
* (s, t, r, shadow, X), for SHADOWCUBE
*
* (s, layer, shadow, X, X), for SHADOW1D_ARRAY
* (s, t, layer, shadow, X), for SHADOW2D_ARRAY
* (s, t, r, layer, shadow), for SHADOWCUBE_ARRAY
*
* (s, t, sample, X, X), for 2D_MSAA
* (s, t, layer, sample, X), for 2D_ARRAY_MSAA
*/
switch (tgsi_tex) {
case TGSI_TEXTURE_1D:
case TGSI_TEXTURE_SHADOW1D:
dim = 1;
break;
case TGSI_TEXTURE_2D:
case TGSI_TEXTURE_RECT:
case TGSI_TEXTURE_1D_ARRAY:
case TGSI_TEXTURE_SHADOW2D:
case TGSI_TEXTURE_SHADOWRECT:
case TGSI_TEXTURE_SHADOW1D_ARRAY:
case TGSI_TEXTURE_2D_MSAA:
dim = 2;
break;
case TGSI_TEXTURE_3D:
case TGSI_TEXTURE_CUBE:
case TGSI_TEXTURE_2D_ARRAY:
case TGSI_TEXTURE_SHADOWCUBE:
case TGSI_TEXTURE_SHADOW2D_ARRAY:
case TGSI_TEXTURE_2D_ARRAY_MSAA:
dim = 3;
break;
case TGSI_TEXTURE_CUBE_ARRAY:
case TGSI_TEXTURE_SHADOWCUBE_ARRAY:
dim = 4;
break;
default:
assert(!"unknown texture target");
dim = 0;
break;
}
if (shadow_or_sample) {
switch (tgsi_tex) {
case TGSI_TEXTURE_SHADOW1D:
/* there is a gap */
*shadow_or_sample = 2;
break;
case TGSI_TEXTURE_SHADOW2D:
case TGSI_TEXTURE_SHADOWRECT:
case TGSI_TEXTURE_SHADOWCUBE:
case TGSI_TEXTURE_SHADOW1D_ARRAY:
case TGSI_TEXTURE_SHADOW2D_ARRAY:
case TGSI_TEXTURE_SHADOWCUBE_ARRAY:
case TGSI_TEXTURE_2D_MSAA:
case TGSI_TEXTURE_2D_ARRAY_MSAA:
*shadow_or_sample = dim;
break;
default:
/* no shadow nor sample */
*shadow_or_sample = -1;
break;
}
}
return dim;
}

3
src/gallium/auxiliary/tgsi/tgsi_util.h
View file

@ -79,6 +79,9 @@ tgsi_util_get_inst_usage_mask(const struct tgsi_full_instruction *inst,
struct tgsi_src_register
tgsi_util_get_src_from_ind(const struct tgsi_ind_register *reg);
int
tgsi_util_get_texture_coord_dim(int tgsi_tex, int *shadow_or_sample);
#if defined __cplusplus
}
#endif