/**
* Compute the setup->coef[] array dadx, dady, a0 values.
* Must be called after setup->vmin,vmax are initialized.
*/
static boolean
setup_line_coefficients(struct setup_context *setup,
const float (*v0)[4],
const float (*v1)[4])
{
struct softpipe_context *softpipe = setup->softpipe;
const struct tgsi_shader_info *fsInfo = &setup->softpipe->fs_variant->info;
const struct sp_setup_info *sinfo = &softpipe->setup_info;
uint fragSlot;
float area;
float v[2];
assert(sinfo->valid);
/* use setup->vmin, vmax to point to vertices */
if (softpipe->rasterizer->flatshade_first)
setup->vprovoke = v0;
else
setup->vprovoke = v1;
setup->vmin = v0;
setup->vmax = v1;
setup->emaj.dx = setup->vmax[0][0] - setup->vmin[0][0];
setup->emaj.dy = setup->vmax[0][1] - setup->vmin[0][1];
/* NOTE: this is not really area but something proportional to it */
area = setup->emaj.dx * setup->emaj.dx + setup->emaj.dy * setup->emaj.dy;
if (area == 0.0f || util_is_inf_or_nan(area))
return FALSE;
setup->oneoverarea = 1.0f / area;
/* z and w are done by linear interpolation:
*/
v[0] = setup->vmin[0][2];
v[1] = setup->vmax[0][2];
line_linear_coeff(setup, &setup->posCoef, 2, v);
v[0] = setup->vmin[0][3];
v[1] = setup->vmax[0][3];
line_linear_coeff(setup, &setup->posCoef, 3, v);
/* setup interpolation for all the remaining attributes:
*/
for (fragSlot = 0; fragSlot < fsInfo->num_inputs; fragSlot++) {
const uint vertSlot = sinfo->attrib[fragSlot].src_index;
uint j;
switch (sinfo->attrib[fragSlot].interp) {
case SP_INTERP_CONSTANT:
for (j = 0; j < TGSI_NUM_CHANNELS; j++)
const_coeff(setup, &setup->coef[fragSlot], vertSlot, j);
break;
case SP_INTERP_LINEAR:
for (j = 0; j < TGSI_NUM_CHANNELS; j++) {
line_apply_cylindrical_wrap(setup->vmin[vertSlot][j],
setup->vmax[vertSlot][j],
fsInfo->input_cylindrical_wrap[fragSlot] & (1 << j),
v);
line_linear_coeff(setup, &setup->coef[fragSlot], j, v);
}
break;
case SP_INTERP_PERSPECTIVE:
for (j = 0; j < TGSI_NUM_CHANNELS; j++) {
line_apply_cylindrical_wrap(setup->vmin[vertSlot][j],
setup->vmax[vertSlot][j],
fsInfo->input_cylindrical_wrap[fragSlot] & (1 << j),
v);
line_persp_coeff(setup, &setup->coef[fragSlot], j, v);
}
break;
case SP_INTERP_POS:
setup_fragcoord_coeff(setup, fragSlot);
break;
default:
assert(0);
}
if (fsInfo->input_semantic_name[fragSlot] == TGSI_SEMANTIC_FACE) {
/* convert 0 to 1.0 and 1 to -1.0 */
setup->coef[fragSlot].a0[0] = setup->facing * -2.0f + 1.0f;
setup->coef[fragSlot].dadx[0] = 0.0;
setup->coef[fragSlot].dady[0] = 0.0;
}
}
return TRUE;
}
/**
* Compute the setup->coef[] array dadx, dady, a0 values.
* Must be called after setup->vmin,vmax are initialized.
*/
static INLINE boolean
setup_line_coefficients(struct setup_context *setup,
const float (*v0)[4],
const float (*v1)[4])
{
struct softpipe_context *softpipe = setup->softpipe;
const struct sp_fragment_shader *spfs = softpipe->fs;
const struct vertex_info *vinfo = softpipe_get_vertex_info(softpipe);
uint fragSlot;
float area;
/* use setup->vmin, vmax to point to vertices */
if (softpipe->rasterizer->flatshade_first)
setup->vprovoke = v0;
else
setup->vprovoke = v1;
setup->vmin = v0;
setup->vmax = v1;
setup->emaj.dx = setup->vmax[0][0] - setup->vmin[0][0];
setup->emaj.dy = setup->vmax[0][1] - setup->vmin[0][1];
/* NOTE: this is not really area but something proportional to it */
area = setup->emaj.dx * setup->emaj.dx + setup->emaj.dy * setup->emaj.dy;
if (area == 0.0f || util_is_inf_or_nan(area))
return FALSE;
setup->oneoverarea = 1.0f / area;
/* z and w are done by linear interpolation:
*/
line_linear_coeff(setup, &setup->posCoef, 0, 2);
line_linear_coeff(setup, &setup->posCoef, 0, 3);
/* setup interpolation for all the remaining attributes:
*/
for (fragSlot = 0; fragSlot < spfs->info.num_inputs; fragSlot++) {
const uint vertSlot = vinfo->attrib[fragSlot].src_index;
uint j;
switch (vinfo->attrib[fragSlot].interp_mode) {
case INTERP_CONSTANT:
for (j = 0; j < NUM_CHANNELS; j++)
const_coeff(setup, &setup->coef[fragSlot], vertSlot, j);
break;
case INTERP_LINEAR:
for (j = 0; j < NUM_CHANNELS; j++)
line_linear_coeff(setup, &setup->coef[fragSlot], vertSlot, j);
break;
case INTERP_PERSPECTIVE:
for (j = 0; j < NUM_CHANNELS; j++)
line_persp_coeff(setup, &setup->coef[fragSlot], vertSlot, j);
break;
case INTERP_POS:
setup_fragcoord_coeff(setup, fragSlot);
break;
default:
assert(0);
}
if (spfs->info.input_semantic_name[fragSlot] == TGSI_SEMANTIC_FACE) {
setup->coef[fragSlot].a0[0] = 1.0f - setup->facing;
setup->coef[fragSlot].dadx[0] = 0.0;
setup->coef[fragSlot].dady[0] = 0.0;
}
}
return TRUE;
}
