-
-/**
- * Helper for intel_miptree_alloc_hiz() that determines the required hiz
- * buffer dimensions and allocates a bo for the hiz buffer.
- */
-static struct intel_miptree_hiz_buffer *
-intel_gen7_hiz_buf_create(struct brw_context *brw,
- struct intel_mipmap_tree *mt)
-{
- unsigned z_width = mt->logical_width0;
- unsigned z_height = mt->logical_height0;
- const unsigned z_depth = MAX2(mt->logical_depth0, 1);
- unsigned hz_width, hz_height;
- struct intel_miptree_hiz_buffer *buf = calloc(sizeof(*buf), 1);
-
- if (!buf)
- return NULL;
-
- /* Gen7 PRM Volume 2, Part 1, 11.5.3 "Hierarchical Depth Buffer" documents
- * adjustments required for Z_Height and Z_Width based on multisampling.
- */
- switch (mt->num_samples) {
- case 0:
- case 1:
- break;
- case 2:
- case 4:
- z_width *= 2;
- z_height *= 2;
- break;
- case 8:
- z_width *= 4;
- z_height *= 2;
- break;
- default:
- unreachable("unsupported sample count");
- }
-
- const unsigned vertical_align = 8; /* 'j' in the docs */
- const unsigned H0 = z_height;
- const unsigned h0 = ALIGN(H0, vertical_align);
- const unsigned h1 = ALIGN(minify(H0, 1), vertical_align);
- const unsigned Z0 = z_depth;
-
- /* HZ_Width (bytes) = ceiling(Z_Width / 16) * 16 */
- hz_width = ALIGN(z_width, 16);
-
- if (mt->target == GL_TEXTURE_3D) {
- unsigned H_i = H0;
- unsigned Z_i = Z0;
- hz_height = 0;
- for (unsigned level = mt->first_level; level <= mt->last_level; ++level) {
- unsigned h_i = ALIGN(H_i, vertical_align);
- /* sum(i=0 to m; h_i * max(1, floor(Z_Depth/2**i))) */
- hz_height += h_i * Z_i;
- H_i = minify(H_i, 1);
- Z_i = minify(Z_i, 1);
- }
- /* HZ_Height =
- * (1/2) * sum(i=0 to m; h_i * max(1, floor(Z_Depth/2**i)))
- */
- hz_height = DIV_ROUND_UP(hz_height, 2);
- } else {
- const unsigned hz_qpitch = h0 + h1 + (12 * vertical_align);
- /* HZ_Height (rows) = Ceiling ( ( Q_pitch * Z_depth/2) /8 ) * 8 */
- hz_height = DIV_ROUND_UP(hz_qpitch * Z0, 2 * 8) * 8;
- }
-
- buf->aux_base.bo = brw_bo_alloc_tiled_2d(brw->bufmgr, "hiz",
- hz_width, hz_height, 1,
- I915_TILING_Y, &buf->aux_base.pitch,
- BO_ALLOC_FOR_RENDER);
- if (!buf->aux_base.bo) {
- free(buf);
- return NULL;
- }
-
- buf->aux_base.size = hz_width * hz_height;
-
- return buf;
-}
-
-
-/**
- * Helper for intel_miptree_alloc_hiz() that determines the required hiz
- * buffer dimensions and allocates a bo for the hiz buffer.
- */
-static struct intel_miptree_hiz_buffer *
-intel_gen8_hiz_buf_create(struct brw_context *brw,
- struct intel_mipmap_tree *mt)
-{
- unsigned z_width = mt->logical_width0;
- unsigned z_height = mt->logical_height0;
- const unsigned z_depth = MAX2(mt->logical_depth0, 1);
- unsigned hz_width, hz_height;
- struct intel_miptree_hiz_buffer *buf = calloc(sizeof(*buf), 1);
-
- if (!buf)
- return NULL;
-
- /* Gen7 PRM Volume 2, Part 1, 11.5.3 "Hierarchical Depth Buffer" documents
- * adjustments required for Z_Height and Z_Width based on multisampling.
- */
- if (brw->gen < 9) {
- switch (mt->num_samples) {
- case 0:
- case 1:
- break;
- case 2:
- case 4:
- z_width *= 2;
- z_height *= 2;
- break;
- case 8:
- z_width *= 4;
- z_height *= 2;
- break;
- default:
- unreachable("unsupported sample count");
- }
- }
-
- const unsigned vertical_align = 8; /* 'j' in the docs */
- const unsigned H0 = z_height;
- const unsigned h0 = ALIGN(H0, vertical_align);
- const unsigned h1 = ALIGN(minify(H0, 1), vertical_align);
- const unsigned Z0 = z_depth;
-
- /* HZ_Width (bytes) = ceiling(Z_Width / 16) * 16 */
- hz_width = ALIGN(z_width, 16);
-
- unsigned H_i = H0;
- unsigned Z_i = Z0;
- unsigned sum_h_i = 0;
- unsigned hz_height_3d_sum = 0;
- for (unsigned level = mt->first_level; level <= mt->last_level; ++level) {
- unsigned i = level - mt->first_level;
- unsigned h_i = ALIGN(H_i, vertical_align);
- /* sum(i=2 to m; h_i) */
- if (i >= 2) {
- sum_h_i += h_i;
- }
- /* sum(i=0 to m; h_i * max(1, floor(Z_Depth/2**i))) */
- hz_height_3d_sum += h_i * Z_i;
- H_i = minify(H_i, 1);
- Z_i = minify(Z_i, 1);
- }
- /* HZ_QPitch = h0 + max(h1, sum(i=2 to m; h_i)) */
- buf->aux_base.qpitch = h0 + MAX2(h1, sum_h_i);
-
- if (mt->target == GL_TEXTURE_3D) {
- /* (1/2) * sum(i=0 to m; h_i * max(1, floor(Z_Depth/2**i))) */
- hz_height = DIV_ROUND_UP(hz_height_3d_sum, 2);
- } else {
- /* HZ_Height (rows) = ceiling( (HZ_QPitch/2)/8) *8 * Z_Depth */
- hz_height = DIV_ROUND_UP(buf->aux_base.qpitch, 2 * 8) * 8 * Z0;
- }
-
- buf->aux_base.bo = brw_bo_alloc_tiled_2d(brw->bufmgr, "hiz",
- hz_width, hz_height, 1,
- I915_TILING_Y, &buf->aux_base.pitch,
- BO_ALLOC_FOR_RENDER);
- if (!buf->aux_base.bo) {
- free(buf);
- return NULL;
- }
-
- buf->aux_base.size = hz_width * hz_height;
-
- return buf;
-}
-
-
-static struct intel_miptree_hiz_buffer *
-intel_hiz_miptree_buf_create(struct brw_context *brw,
- struct intel_mipmap_tree *mt)
-{
- struct intel_miptree_hiz_buffer *buf = calloc(sizeof(*buf), 1);
- if (!buf)
- return NULL;
-
- struct isl_surf temp_main_surf;
- intel_miptree_get_isl_surf(brw, mt, &temp_main_surf);
-
- if (!isl_surf_get_hiz_surf(&brw->isl_dev, &temp_main_surf,
- &buf->aux_base.surf)) {
- free(buf);
- return NULL;
- }
-
- struct isl_surf *surf = &buf->aux_base.surf;
- buf->aux_base.bo = brw_bo_alloc_tiled(brw->bufmgr, "hiz", surf->size,
- I915_TILING_Y, surf->row_pitch,
- BO_ALLOC_FOR_RENDER);
- if (!buf->aux_base.bo) {
- free(buf);
- return NULL;
- }
-
- return buf;
-}
-
-bool
-intel_miptree_wants_hiz_buffer(struct brw_context *brw,
- struct intel_mipmap_tree *mt)
-{
- if (!brw->has_hiz)
- return false;
-
- if (mt->hiz_buf != NULL)
- return false;
-
- if (mt->aux_disable & INTEL_AUX_DISABLE_HIZ)
- return false;
-
- switch (mt->format) {
- case MESA_FORMAT_Z_FLOAT32:
- case MESA_FORMAT_Z32_FLOAT_S8X24_UINT:
- case MESA_FORMAT_Z24_UNORM_X8_UINT:
- case MESA_FORMAT_Z24_UNORM_S8_UINT:
- case MESA_FORMAT_Z_UNORM16:
- return true;
- default:
- return false;
- }
-}
-