/* Interpolate between two vertices and put the result into a0.0.
* Increment a0.0 accordingly.
+ *
+ * Beware that dest_ptr can be equal to v0_ptr!
*/
void brw_clip_interp_vertex( struct brw_clip_compile *c,
struct brw_indirect dest_ptr,
bool force_edgeflag)
{
struct brw_compile *p = &c->func;
- struct brw_reg tmp = get_tmp(c);
+ struct brw_reg t_nopersp, v0_ndc_copy;
GLuint slot;
/* Just copy the vertex header:
*/
brw_copy_indirect_to_indirect(p, dest_ptr, v0_ptr, 1);
- /* Iterate over each attribute (could be done in pairs?)
+
+ /* First handle the 3D and NDC interpolation, in case we
+ * need noperspective interpolation. Doing it early has no
+ * performance impact in any case.
+ */
+
+ /* Take a copy of the v0 NDC coordinates, in case dest == v0. */
+ if (c->has_noperspective_shading) {
+ GLuint offset = brw_varying_to_offset(&c->vue_map,
+ BRW_VARYING_SLOT_NDC);
+ v0_ndc_copy = get_tmp(c);
+ brw_MOV(p, v0_ndc_copy, deref_4f(v0_ptr, offset));
+ }
+
+ /* Compute the new 3D position
+ *
+ * dest_hpos = v0_hpos * (1 - t0) + v1_hpos * t0
+ */
+ {
+ GLuint delta = brw_varying_to_offset(&c->vue_map, VARYING_SLOT_POS);
+ struct brw_reg tmp = get_tmp(c);
+ brw_MUL(p, vec4(brw_null_reg()), deref_4f(v1_ptr, delta), t0);
+ brw_MAC(p, tmp, negate(deref_4f(v0_ptr, delta)), t0);
+ brw_ADD(p, deref_4f(dest_ptr, delta), deref_4f(v0_ptr, delta), tmp);
+ release_tmp(c, tmp);
+ }
+
+ /* Recreate the projected (NDC) coordinate in the new vertex header */
+ brw_clip_project_vertex(c, dest_ptr);
+
+ /* If we have noperspective attributes,
+ * we need to compute the screen-space t
+ */
+ if (c->has_noperspective_shading) {
+ GLuint delta = brw_varying_to_offset(&c->vue_map,
+ BRW_VARYING_SLOT_NDC);
+ struct brw_reg tmp = get_tmp(c);
+ t_nopersp = get_tmp(c);
+
+ /* t_nopersp = vec4(v1.xy, dest.xy) */
+ brw_MOV(p, t_nopersp, deref_4f(v1_ptr, delta));
+ brw_MOV(p, tmp, deref_4f(dest_ptr, delta));
+ brw_set_access_mode(p, BRW_ALIGN_16);
+ brw_MOV(p,
+ brw_writemask(t_nopersp, WRITEMASK_ZW),
+ brw_swizzle(tmp, 0, 1, 0, 1));
+
+ /* t_nopersp = vec4(v1.xy, dest.xy) - v0.xyxy */
+ brw_ADD(p, t_nopersp, t_nopersp,
+ negate(brw_swizzle(v0_ndc_copy, 0, 1, 0, 1)));
+
+ /* Add the absolute values of the X and Y deltas so that if
+ * the points aren't in the same place on the screen we get
+ * nonzero values to divide.
+ *
+ * After that, we have vert1 - vert0 in t_nopersp.x and
+ * vertnew - vert0 in t_nopersp.y
+ *
+ * t_nopersp = vec2(|v1.x -v0.x| + |v1.y -v0.y|,
+ * |dest.x-v0.x| + |dest.y-v0.y|)
+ */
+ brw_ADD(p,
+ brw_writemask(t_nopersp, WRITEMASK_XY),
+ brw_abs(brw_swizzle(t_nopersp, 0, 2, 0, 0)),
+ brw_abs(brw_swizzle(t_nopersp, 1, 3, 0, 0)));
+ brw_set_access_mode(p, BRW_ALIGN_1);
+
+ /* If the points are in the same place, just substitute a
+ * value to avoid divide-by-zero
+ */
+ brw_CMP(p, vec1(brw_null_reg()), BRW_CONDITIONAL_EQ,
+ vec1(t_nopersp),
+ brw_imm_f(0));
+ brw_IF(p, BRW_EXECUTE_1);
+ brw_MOV(p, t_nopersp, brw_imm_vf4(VF_ONE, VF_ZERO, VF_ZERO, VF_ZERO));
+ brw_ENDIF(p);
+
+ /* Now compute t_nopersp = t_nopersp.y/t_nopersp.x and broadcast it. */
+ brw_math_invert(p, get_element(t_nopersp, 0), get_element(t_nopersp, 0));
+ brw_MUL(p, vec1(t_nopersp), vec1(t_nopersp),
+ vec1(suboffset(t_nopersp, 1)));
+ brw_set_access_mode(p, BRW_ALIGN_16);
+ brw_MOV(p, t_nopersp, brw_swizzle(t_nopersp, 0, 0, 0, 0));
+ brw_set_access_mode(p, BRW_ALIGN_1);
+
+ release_tmp(c, tmp);
+ release_tmp(c, v0_ndc_copy);
+ }
+
+ /* Now we can iterate over each attribute
+ * (could be done in pairs?)
*/
for (slot = 0; slot < c->vue_map.num_slots; slot++) {
int varying = c->vue_map.slot_to_varying[slot];
GLuint delta = brw_vue_slot_to_offset(slot);
+ /* HPOS, NDC already handled above */
+ if (varying == VARYING_SLOT_POS || varying == BRW_VARYING_SLOT_NDC)
+ continue;
+
+
if (varying == VARYING_SLOT_EDGE) {
if (force_edgeflag)
brw_MOV(p, deref_4f(dest_ptr, delta), brw_imm_f(1));
else
brw_MOV(p, deref_4f(dest_ptr, delta), deref_4f(v0_ptr, delta));
- } else if (varying == VARYING_SLOT_PSIZ ||
- varying == VARYING_SLOT_CLIP_DIST0 ||
- varying == VARYING_SLOT_CLIP_DIST1) {
- /* PSIZ doesn't need interpolation because it isn't used by the
- * fragment shader. CLIP_DIST0 and CLIP_DIST1 don't need
- * intepolation because on pre-GEN6, these are just placeholder VUE
- * slots that don't perform any action.
+ } else if (varying == VARYING_SLOT_PSIZ) {
+ /* PSIZ doesn't need interpolation because it isn't used by the
+ * fragment shader.
*/
} else if (varying < VARYING_SLOT_MAX) {
/* This is a true vertex result (and not a special value for the VUE
* header), so interpolate:
*
* New = attr0 + t*attr1 - t*attr0
+ *
+ * Unless the attribute is flat shaded -- in which case just copy
+ * from one of the sources (doesn't matter which; already copied from pv)
*/
- brw_MUL(p,
- vec4(brw_null_reg()),
- deref_4f(v1_ptr, delta),
- t0);
-
- brw_MAC(p,
- tmp,
- negate(deref_4f(v0_ptr, delta)),
- t0);
-
- brw_ADD(p,
- deref_4f(dest_ptr, delta),
- deref_4f(v0_ptr, delta),
- tmp);
+ GLuint interp = c->key.interpolation_mode.mode[slot];
+
+ if (interp != INTERP_QUALIFIER_FLAT) {
+ struct brw_reg tmp = get_tmp(c);
+ struct brw_reg t =
+ interp == INTERP_QUALIFIER_NOPERSPECTIVE ? t_nopersp : t0;
+
+ brw_MUL(p,
+ vec4(brw_null_reg()),
+ deref_4f(v1_ptr, delta),
+ t);
+
+ brw_MAC(p,
+ tmp,
+ negate(deref_4f(v0_ptr, delta)),
+ t);
+
+ brw_ADD(p,
+ deref_4f(dest_ptr, delta),
+ deref_4f(v0_ptr, delta),
+ tmp);
+
+ release_tmp(c, tmp);
+ }
+ else {
+ brw_MOV(p,
+ deref_4f(dest_ptr, delta),
+ deref_4f(v0_ptr, delta));
+ }
}
}
brw_MOV(p, deref_4f(dest_ptr, delta), brw_imm_f(0));
}
- release_tmp(c, tmp);
-
- /* Recreate the projected (NDC) coordinate in the new vertex
- * header:
- */
- brw_clip_project_vertex(c, dest_ptr );
+ if (c->has_noperspective_shading)
+ release_tmp(c, t_nopersp);
}
void brw_clip_emit_vue(struct brw_clip_compile *c,
struct brw_indirect vert,
- bool allocate,
- bool eot,
+ enum brw_urb_write_flags flags,
GLuint header)
{
struct brw_compile *p = &c->func;
+ bool allocate = flags & BRW_URB_WRITE_ALLOCATE;
brw_clip_ff_sync(c);
- assert(!(allocate && eot));
+ /* Any URB entry that is allocated must subsequently be used or discarded,
+ * so it doesn't make sense to mark EOT and ALLOCATE at the same time.
+ */
+ assert(!(allocate && (flags & BRW_URB_WRITE_EOT)));
/* Copy the vertex from vertn into m1..mN+1:
*/
allocate ? c->reg.R0 : retype(brw_null_reg(), BRW_REGISTER_TYPE_UD),
0,
c->reg.R0,
- allocate,
- 1, /* used */
+ flags,
c->nr_regs + 1, /* msg length */
allocate ? 1 : 0, /* response_length */
- eot, /* eot */
- 1, /* writes_complete */
0, /* urb offset */
BRW_URB_SWIZZLE_NONE);
}
retype(brw_null_reg(), BRW_REGISTER_TYPE_UD),
0,
c->reg.R0,
- 0, /* allocate */
- 0, /* used */
+ BRW_URB_WRITE_UNUSED | BRW_URB_WRITE_EOT_COMPLETE,
1, /* msg len */
0, /* response len */
- 1, /* eot */
- 1, /* writes complete */
0,
BRW_URB_SWIZZLE_NONE);
}
{
struct brw_compile *p = &c->func;
struct brw_reg incoming = get_element_ud(c->reg.R0, 2);
+ struct brw_context *brw = p->brw;
/* Shift so that lowest outcode bit is rightmost:
*/
/* Rearrange userclip outcodes so that they come directly after
* the fixed plane bits.
*/
- brw_AND(p, tmp, incoming, brw_imm_ud(0x3f<<14));
+ if (brw->gen == 5 || brw->is_g4x)
+ brw_AND(p, tmp, incoming, brw_imm_ud(0xff<<14));
+ else
+ brw_AND(p, tmp, incoming, brw_imm_ud(0x3f<<14));
+
brw_SHR(p, tmp, tmp, brw_imm_ud(8));
brw_OR(p, c->reg.planemask, c->reg.planemask, tmp);
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