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softpipe: implement TXF support via get_texel callback 

This just calls the texel fetch functions directly bypassing the sampling,

notes:
1: loops inside switch should be more optimal.
2: borders can be sampled though only up to border depth, outside that
its undefined.

Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Dave Airlie 2011-08-25 14:54:27 +01:00
parent d562f97bef
commit 62ad6e66a5
1 changed files with 69 additions and 0 deletions
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69
src/gallium/drivers/softpipe/sp_tex_sample.c
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@ -2606,6 +2606,74 @@ sample_get_dims(struct tgsi_sampler *tgsi_sampler, int level,
}
}
/* this function is only used for unfiltered texel gets
via the TGSI TXF opcode. */
static void
sample_get_texels(struct tgsi_sampler *tgsi_sampler,
const int v_i[QUAD_SIZE],
const int v_j[QUAD_SIZE],
const int v_k[QUAD_SIZE],
const int lod[QUAD_SIZE],
float rgba[NUM_CHANNELS][QUAD_SIZE])
{
const struct sp_sampler_variant *samp = sp_sampler_variant(tgsi_sampler);
union tex_tile_address addr;
const struct pipe_resource *texture = samp->view->texture;
int j, c;
float *tx;
addr.value = 0;
/* TODO write a better test for LOD */
addr.bits.level = lod[0];
switch(texture->target) {
case PIPE_TEXTURE_1D:
for (j = 0; j < QUAD_SIZE; j++) {
tx = get_texel_2d(samp, addr, v_i[j], 0);
for (c = 0; c < 4; c++) {
rgba[c][j] = tx[c];
}
}
break;
case PIPE_TEXTURE_1D_ARRAY:
for (j = 0; j < QUAD_SIZE; j++) {
tx = get_texel_1d_array(samp, addr, v_i[j], v_j[j]);
for (c = 0; c < 4; c++) {
rgba[c][j] = tx[c];
}
}
break;
case PIPE_TEXTURE_2D:
case PIPE_TEXTURE_RECT:
for (j = 0; j < QUAD_SIZE; j++) {
tx = get_texel_2d(samp, addr, v_i[j], v_j[j]);
for (c = 0; c < 4; c++) {
rgba[c][j] = tx[c];
}
}
break;
case PIPE_TEXTURE_2D_ARRAY:
for (j = 0; j < QUAD_SIZE; j++) {
tx = get_texel_2d_array(samp, addr, v_i[j], v_j[j], v_k[j]);
for (c = 0; c < 4; c++) {
rgba[c][j] = tx[c];
}
}
break;
case PIPE_TEXTURE_3D:
for (j = 0; j < QUAD_SIZE; j++) {
tx = get_texel_3d(samp, addr, v_i[j], v_j[j], v_k[j]);
for (c = 0; c < 4; c++) {
rgba[c][j] = tx[c];
}
}
break;
case PIPE_TEXTURE_CUBE: /* TXF can't work on CUBE according to spec */
default:
assert(!"Unknown or CUBE texture type in TXF processing\n");
break;
}
}
/**
* Create a sampler variant for a given set of non-orthogonal state.
*/
@ -2732,5 +2800,6 @@ sp_create_sampler_variant( const struct pipe_sampler_state *sampler,
}
samp->base.get_dims = sample_get_dims;
samp->base.get_texel = sample_get_texels;
return samp;
}