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softpipe: Implement cylindrical wrapping for linear interpolator.

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This commit is contained in:
Michal Krol 2010-02-03 15:30:17 +01:00
parent 607a830fe2
commit e04c8ecc61
1 changed files with 35 additions and 11 deletions
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46
src/gallium/drivers/softpipe/sp_setup.c
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@ -419,19 +419,38 @@ static void const_coeff( struct setup_context *setup,
* Compute a0, dadx and dady for a linearly interpolated coefficient,
* for a triangle.
*/
static void tri_linear_coeff( struct setup_context *setup,
struct tgsi_interp_coef *coef,
uint vertSlot, uint i)
static void
tri_linear_coeff(struct setup_context *setup,
struct tgsi_interp_coef *coef,
uint vertSlot,
uint i,
uint cylindrical_wrap)
{
float botda = setup->vmid[vertSlot][i] - setup->vmin[vertSlot][i];
float majda = setup->vmax[vertSlot][i] - setup->vmin[vertSlot][i];
float a = setup->ebot.dy * majda - botda * setup->emaj.dy;
float b = setup->emaj.dx * botda - majda * setup->ebot.dx;
float dadx = a * setup->oneoverarea;
float dady = b * setup->oneoverarea;
float a, b;
float dadx, dady;
assert(i <= 3);
if (cylindrical_wrap) {
if (botda > 0.5f) {
botda -= 1.0f;
} else if (botda < -0.5f) {
botda += 1.0f;
}
if (majda > 0.5f) {
majda -= 1.0f;
} else if (majda < -0.5f) {
majda += 1.0f;
}
}
a = setup->ebot.dy * majda - botda * setup->emaj.dy;
b = setup->emaj.dx * botda - majda * setup->ebot.dx;
dadx = a * setup->oneoverarea;
dady = b * setup->oneoverarea;
coef->dadx[i] = dadx;
coef->dady[i] = dady;
@ -547,8 +566,8 @@ static void setup_tri_coefficients( struct setup_context *setup )
/* z and w are done by linear interpolation:
*/
tri_linear_coeff(setup, &setup->posCoef, 0, 2);
tri_linear_coeff(setup, &setup->posCoef, 0, 3);
tri_linear_coeff(setup, &setup->posCoef, 0, 2, 0);
tri_linear_coeff(setup, &setup->posCoef, 0, 3, 0);
/* setup interpolation for all the remaining attributes:
*/
@ -562,8 +581,13 @@ static void setup_tri_coefficients( struct setup_context *setup )
const_coeff(setup, &setup->coef[fragSlot], vertSlot, j);
break;
case INTERP_LINEAR:
for (j = 0; j < NUM_CHANNELS; j++)
tri_linear_coeff(setup, &setup->coef[fragSlot], vertSlot, j);
for (j = 0; j < NUM_CHANNELS; j++) {
tri_linear_coeff(setup,
&setup->coef[fragSlot],
vertSlot,
j,
spfs->info.input_cylindrical_wrap[fragSlot] & (1 << j));
}
break;
case INTERP_PERSPECTIVE:
for (j = 0; j < NUM_CHANNELS; j++)