/**
* Compute the setup->coef[] array dadx, dady, a0 values.
* Must be called after setup->vmin,vmid,vmax,vprovoke are initialized.
*/
static void setup_tri_coefficients( struct setup_context *setup )
{
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;
/* z and w are done by linear interpolation:
*/
tri_linear_coeff(setup, &setup->posCoef, 0, 2);
tri_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++)
tri_linear_coeff(setup, &setup->coef[fragSlot], vertSlot, j);
break;
case INTERP_PERSPECTIVE:
for (j = 0; j < NUM_CHANNELS; j++)
tri_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_FOG) {
/* FOG.y = front/back facing XXX fix this */
setup->coef[fragSlot].a0[1] = 1.0f - setup->quad.input.facing;
setup->coef[fragSlot].dadx[1] = 0.0;
setup->coef[fragSlot].dady[1] = 0.0;
}
}
}
/**
* Called from vbuf module.
*
* Note that there's actually two different vertex layouts in softpipe.
*
* The normal one is computed in softpipe_get_vertex_info() above and is
* used by the point/line/tri "setup" code.
*
* The other one (this one) is only used by the vbuf module (which is
* not normally used by default but used in testing). For the vbuf module,
* we basically want to pass-through the draw module's vertex layout as-is.
* When the softpipe vbuf code begins drawing, the normal vertex layout
* will come into play again.
*/
struct vertex_info *
softpipe_get_vbuf_vertex_info(struct softpipe_context *softpipe)
{
(void) softpipe_get_vertex_info(softpipe);
return &softpipe->vertex_info_vbuf;
}
/**
* 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;
}
/**
* Do setup for point rasterization, then render the point.
* Round or square points...
* XXX could optimize a lot for 1-pixel points.
*/
void
sp_setup_point( struct setup_context *setup,
const float (*v0)[4] )
{
struct softpipe_context *softpipe = setup->softpipe;
const struct sp_fragment_shader *spfs = softpipe->fs;
const int sizeAttr = setup->softpipe->psize_slot;
const float size
= sizeAttr > 0 ? v0[sizeAttr][0]
: setup->softpipe->rasterizer->point_size;
const float halfSize = 0.5F * size;
const boolean round = (boolean) setup->softpipe->rasterizer->point_smooth;
const float x = v0[0][0]; /* Note: data[0] is always position */
const float y = v0[0][1];
const struct vertex_info *vinfo = softpipe_get_vertex_info(softpipe);
uint fragSlot;
#if DEBUG_VERTS
debug_printf("Setup point:\n");
print_vertex(setup, v0);
#endif
if (softpipe->no_rast)
return;
assert(setup->softpipe->reduced_prim == PIPE_PRIM_POINTS);
/* For points, all interpolants are constant-valued.
* However, for point sprites, we'll need to setup texcoords appropriately.
* XXX: which coefficients are the texcoords???
* We may do point sprites as textured quads...
*
* KW: We don't know which coefficients are texcoords - ultimately
* the choice of what interpolation mode to use for each attribute
* should be determined by the fragment program, using
* per-attribute declaration statements that include interpolation
* mode as a parameter. So either the fragment program will have
* to be adjusted for pointsprite vs normal point behaviour, or
* otherwise a special interpolation mode will have to be defined
* which matches the required behaviour for point sprites. But -
* the latter is not a feature of normal hardware, and as such
* probably should be ruled out on that basis.
*/
setup->vprovoke = v0;
/* setup Z, W */
const_coeff(setup, &setup->posCoef, 0, 2);
const_coeff(setup, &setup->posCoef, 0, 3);
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:
/* fall-through */
case INTERP_LINEAR:
for (j = 0; j < NUM_CHANNELS; j++)
const_coeff(setup, &setup->coef[fragSlot], vertSlot, j);
break;
case INTERP_PERSPECTIVE:
for (j = 0; j < NUM_CHANNELS; j++)
point_persp_coeff(setup, setup->vprovoke,
&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;
}
}
if (halfSize <= 0.5 && !round) {
/* special case for 1-pixel points */
const int ix = ((int) x) & 1;
const int iy = ((int) y) & 1;
setup->quad[0].input.x0 = (int) x - ix;
setup->quad[0].input.y0 = (int) y - iy;
setup->quad[0].inout.mask = (1 << ix) << (2 * iy);
clip_emit_quad( setup, &setup->quad[0] );
}
else {
if (round) {
/* rounded points */
const int ixmin = block((int) (x - halfSize));
const int ixmax = block((int) (x + halfSize));
const int iymin = block((int) (y - halfSize));
const int iymax = block((int) (y + halfSize));
const float rmin = halfSize - 0.7071F; /* 0.7071 = sqrt(2)/2 */
const float rmax = halfSize + 0.7071F;
const float rmin2 = MAX2(0.0F, rmin * rmin);
const float rmax2 = rmax * rmax;
const float cscale = 1.0F / (rmax2 - rmin2);
int ix, iy;
for (iy = iymin; iy <= iymax; iy += 2) {
for (ix = ixmin; ix <= ixmax; ix += 2) {
float dx, dy, dist2, cover;
setup->quad[0].inout.mask = 0x0;
dx = (ix + 0.5f) - x;
dy = (iy + 0.5f) - y;
dist2 = dx * dx + dy * dy;
if (dist2 <= rmax2) {
cover = 1.0F - (dist2 - rmin2) * cscale;
setup->quad[0].input.coverage[QUAD_TOP_LEFT] = MIN2(cover, 1.0f);
setup->quad[0].inout.mask |= MASK_TOP_LEFT;
}
dx = (ix + 1.5f) - x;
dy = (iy + 0.5f) - y;
dist2 = dx * dx + dy * dy;
if (dist2 <= rmax2) {
cover = 1.0F - (dist2 - rmin2) * cscale;
setup->quad[0].input.coverage[QUAD_TOP_RIGHT] = MIN2(cover, 1.0f);
setup->quad[0].inout.mask |= MASK_TOP_RIGHT;
}
dx = (ix + 0.5f) - x;
dy = (iy + 1.5f) - y;
dist2 = dx * dx + dy * dy;
if (dist2 <= rmax2) {
cover = 1.0F - (dist2 - rmin2) * cscale;
setup->quad[0].input.coverage[QUAD_BOTTOM_LEFT] = MIN2(cover, 1.0f);
setup->quad[0].inout.mask |= MASK_BOTTOM_LEFT;
}
dx = (ix + 1.5f) - x;
dy = (iy + 1.5f) - y;
dist2 = dx * dx + dy * dy;
if (dist2 <= rmax2) {
cover = 1.0F - (dist2 - rmin2) * cscale;
setup->quad[0].input.coverage[QUAD_BOTTOM_RIGHT] = MIN2(cover, 1.0f);
setup->quad[0].inout.mask |= MASK_BOTTOM_RIGHT;
}
if (setup->quad[0].inout.mask) {
setup->quad[0].input.x0 = ix;
setup->quad[0].input.y0 = iy;
clip_emit_quad( setup, &setup->quad[0] );
}
}
}
}
else {
/* square points */
const int xmin = (int) (x + 0.75 - halfSize);
const int ymin = (int) (y + 0.25 - halfSize);
const int xmax = xmin + (int) size;
const int ymax = ymin + (int) size;
/* XXX could apply scissor to xmin,ymin,xmax,ymax now */
const int ixmin = block(xmin);
const int ixmax = block(xmax - 1);
const int iymin = block(ymin);
const int iymax = block(ymax - 1);
int ix, iy;
/*
debug_printf("(%f, %f) -> X:%d..%d Y:%d..%d\n", x, y, xmin, xmax,ymin,ymax);
*/
for (iy = iymin; iy <= iymax; iy += 2) {
uint rowMask = 0xf;
if (iy < ymin) {
/* above the top edge */
rowMask &= (MASK_BOTTOM_LEFT | MASK_BOTTOM_RIGHT);
}
if (iy + 1 >= ymax) {
/* below the bottom edge */
rowMask &= (MASK_TOP_LEFT | MASK_TOP_RIGHT);
}
for (ix = ixmin; ix <= ixmax; ix += 2) {
uint mask = rowMask;
if (ix < xmin) {
/* fragment is past left edge of point, turn off left bits */
mask &= (MASK_BOTTOM_RIGHT | MASK_TOP_RIGHT);
}
if (ix + 1 >= xmax) {
/* past the right edge */
mask &= (MASK_BOTTOM_LEFT | MASK_TOP_LEFT);
}
setup->quad[0].inout.mask = mask;
setup->quad[0].input.x0 = ix;
setup->quad[0].input.y0 = iy;
clip_emit_quad( setup, &setup->quad[0] );
}
}
}
}
}
/**
* 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 vertex_info *vinfo = softpipe_get_vertex_info(softpipe);
uint fragSlot;
float area;
float v[2];
/* 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 = vinfo->attrib[fragSlot].src_index;
uint j;
switch (vinfo->attrib[fragSlot].interp_mode) {
case INTERP_CONSTANT:
for (j = 0; j < TGSI_NUM_CHANNELS; j++)
const_coeff(setup, &setup->coef[fragSlot], vertSlot, j);
break;
case 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 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 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,vmid,vmax,vprovoke are initialized.
*/
static void
setup_tri_coefficients(struct setup_context *setup)
{
struct softpipe_context *softpipe = setup->softpipe;
const struct tgsi_shader_info *fsInfo = &setup->softpipe->fs_variant->info;
const struct vertex_info *vinfo = softpipe_get_vertex_info(softpipe);
uint fragSlot;
float v[3];
/* z and w are done by linear interpolation:
*/
v[0] = setup->vmin[0][2];
v[1] = setup->vmid[0][2];
v[2] = setup->vmax[0][2];
tri_linear_coeff(setup, &setup->posCoef, 2, v);
v[0] = setup->vmin[0][3];
v[1] = setup->vmid[0][3];
v[2] = setup->vmax[0][3];
tri_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 = vinfo->attrib[fragSlot].src_index;
uint j;
switch (vinfo->attrib[fragSlot].interp_mode) {
case INTERP_CONSTANT:
for (j = 0; j < TGSI_NUM_CHANNELS; j++)
const_coeff(setup, &setup->coef[fragSlot], vertSlot, j);
break;
case INTERP_LINEAR:
for (j = 0; j < TGSI_NUM_CHANNELS; j++) {
tri_apply_cylindrical_wrap(setup->vmin[vertSlot][j],
setup->vmid[vertSlot][j],
setup->vmax[vertSlot][j],
fsInfo->input_cylindrical_wrap[fragSlot] & (1 << j),
v);
tri_linear_coeff(setup, &setup->coef[fragSlot], j, v);
}
break;
case INTERP_PERSPECTIVE:
for (j = 0; j < TGSI_NUM_CHANNELS; j++) {
tri_apply_cylindrical_wrap(setup->vmin[vertSlot][j],
setup->vmid[vertSlot][j],
setup->vmax[vertSlot][j],
fsInfo->input_cylindrical_wrap[fragSlot] & (1 << j),
v);
tri_persp_coeff(setup, &setup->coef[fragSlot], j, v);
}
break;
case 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;
}
if (0) {
for (j = 0; j < TGSI_NUM_CHANNELS; j++) {
debug_printf("attr[%d].%c: a0:%f dx:%f dy:%f\n",
fragSlot, "xyzw"[j],
setup->coef[fragSlot].a0[j],
setup->coef[fragSlot].dadx[j],
setup->coef[fragSlot].dady[j]);
}
}
}
}