EEVEE-Next: Split lightprobe volume eval to its own file
Simple cleanup to reduce dependencies in code.
This commit is contained in:
Clément Foucault
@@ -539,6 +539,7 @@ set(GLSL_SRC
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engines/eevee_next/shaders/eevee_lightprobe_irradiance_offset_comp.glsl
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engines/eevee_next/shaders/eevee_lightprobe_irradiance_load_comp.glsl
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engines/eevee_next/shaders/eevee_lightprobe_lib.glsl
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engines/eevee_next/shaders/eevee_lightprobe_volume_eval_lib.glsl
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engines/eevee_next/shaders/eevee_lookdev_display_frag.glsl
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engines/eevee_next/shaders/eevee_lookdev_display_vert.glsl
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engines/eevee_next/shaders/eevee_ltc_lib.glsl
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@@ -2,212 +2,14 @@
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/**
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* The resources expected to be defined are:
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* - grids_infos_buf
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* - bricks_infos_buf
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* - irradiance_atlas_tx
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* Needed for sampling (not for upload):
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* - util_tx
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* - sampling_buf
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*/
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#pragma BLENDER_REQUIRE(gpu_shader_math_base_lib.glsl)
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#pragma BLENDER_REQUIRE(gpu_shader_codegen_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_lightprobe_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_spherical_harmonics_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_sampling_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_ray_generate_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_reflection_probe_eval_lib.glsl)
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#pragma BLENDER_REQUIRE(gpu_shader_math_base_lib.glsl)
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/**
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* Return the brick coordinate inside the grid.
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*/
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ivec3 lightprobe_irradiance_grid_brick_coord(vec3 lP)
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{
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ivec3 brick_coord = ivec3((lP - 0.5) / float(IRRADIANCE_GRID_BRICK_SIZE - 1));
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/* Avoid sampling adjacent bricks. */
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return max(brick_coord, ivec3(0));
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}
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/**
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* Return the local coordinated of the shading point inside the brick in unnormalized coordinate.
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*/
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vec3 lightprobe_irradiance_grid_brick_local_coord(IrradianceGridData grid_data,
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vec3 lP,
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ivec3 brick_coord)
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{
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/* Avoid sampling adjacent bricks around the origin. */
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lP = max(lP, vec3(0.5));
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/* Local position inside the brick (still in grid sample spacing unit). */
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vec3 brick_lP = lP - vec3(brick_coord) * float(IRRADIANCE_GRID_BRICK_SIZE - 1);
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return brick_lP;
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}
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/**
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* Return the biased local brick local coordinated.
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*/
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vec3 lightprobe_irradiance_grid_bias_sample_coord(IrradianceGridData grid_data,
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uvec2 brick_atlas_coord,
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vec3 brick_lP,
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vec3 lNg)
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{
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/* A cell is the interpolation region between 8 texels. */
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vec3 cell_lP = brick_lP - 0.5;
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vec3 cell_start = floor(cell_lP);
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vec3 cell_fract = cell_lP - cell_start;
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/* NOTE(fclem): Use uint to avoid signed int modulo. */
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uint vis_comp = uint(cell_start.z) % 4u;
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/* Visibility is stored after the irradiance. */
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ivec3 vis_coord = ivec3(ivec2(brick_atlas_coord), IRRADIANCE_GRID_BRICK_SIZE * 4) +
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ivec3(cell_start);
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/* Visibility is stored packed 1 cell per channel. */
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vis_coord.z -= int(vis_comp);
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float cell_visibility = texelFetch(irradiance_atlas_tx, vis_coord, 0)[vis_comp];
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int cell_visibility_bits = int(cell_visibility);
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/**
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* References:
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*
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* "Probe-based lighting, strand-based hair system, and physical hair shading in Unity’s Enemies"
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* by Francesco Cifariello Ciardi, Lasse Jon Fuglsang Pedersen and John Parsaie.
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*
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* "Multi-Scale Global Illumination in Quantum Break"
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* by Ari Silvennoinen and Ville Timonen.
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*
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* “Dynamic Diffuse Global Illumination with Ray-Traced Irradiance Fields”
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* by Morgan McGuire.
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*/
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float trilinear_weights[8];
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float total_weight = 0.0;
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for (int i = 0; i < 8; i++) {
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ivec3 sample_position = lightprobe_irradiance_grid_cell_corner(i);
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vec3 trilinear = select(1.0 - cell_fract, cell_fract, bvec3(sample_position));
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float positional_weight = trilinear.x * trilinear.y * trilinear.z;
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float len;
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vec3 corner_vec = vec3(sample_position) - cell_fract;
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vec3 corner_dir = normalize_and_get_length(corner_vec, len);
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float cos_theta = (len > 1e-8) ? dot(lNg, corner_dir) : 1.0;
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float geometry_weight = saturate(cos_theta * 0.5 + 0.5);
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float validity_weight = float((cell_visibility_bits >> i) & 1);
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/* Biases. See McGuire's presentation. */
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positional_weight += 0.001;
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geometry_weight = square(geometry_weight) + 0.2 + grid_data.facing_bias;
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trilinear_weights[i] = saturate(positional_weight * geometry_weight * validity_weight);
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total_weight += trilinear_weights[i];
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}
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float total_weight_inv = safe_rcp(total_weight);
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vec3 trilinear_coord = vec3(0.0);
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for (int i = 0; i < 8; i++) {
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vec3 sample_position = vec3((ivec3(i) >> ivec3(0, 1, 2)) & 1);
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trilinear_coord += sample_position * trilinear_weights[i] * total_weight_inv;
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}
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/* Replace sampling coordinates with manually weighted trilinear coordinates. */
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return 0.5 + cell_start + trilinear_coord;
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}
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SphericalHarmonicL1 lightprobe_irradiance_sample_atlas(sampler3D atlas_tx, vec3 atlas_coord)
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{
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vec4 texture_coord = vec4(atlas_coord, float(IRRADIANCE_GRID_BRICK_SIZE)) /
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vec3(textureSize(atlas_tx, 0)).xyzz;
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SphericalHarmonicL1 sh;
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sh.L0.M0 = textureLod(atlas_tx, texture_coord.xyz, 0.0);
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texture_coord.z += texture_coord.w;
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sh.L1.Mn1 = textureLod(atlas_tx, texture_coord.xyz, 0.0);
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texture_coord.z += texture_coord.w;
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sh.L1.M0 = textureLod(atlas_tx, texture_coord.xyz, 0.0);
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texture_coord.z += texture_coord.w;
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sh.L1.Mp1 = textureLod(atlas_tx, texture_coord.xyz, 0.0);
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return sh;
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}
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SphericalHarmonicL1 lightprobe_irradiance_sample(
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sampler3D atlas_tx, vec3 P, vec3 V, vec3 Ng, const bool do_bias)
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{
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vec3 lP;
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int index = -1;
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int i = 0;
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#ifdef IRRADIANCE_GRID_UPLOAD
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i = grid_start_index;
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#endif
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#ifdef IRRADIANCE_GRID_SAMPLING
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float random = interlieved_gradient_noise(UTIL_TEXEL, 0.0, 0.0);
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random = fract(random + sampling_rng_1D_get(SAMPLING_LIGHTPROBE));
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#endif
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for (; i < IRRADIANCE_GRID_MAX; i++) {
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/* Last grid is tagged as invalid to stop the iteration. */
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if (grids_infos_buf[i].grid_size.x == -1) {
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/* Sample the last grid instead. */
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index = i - 1;
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break;
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}
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/* If sample fall inside the grid, step out of the loop. */
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if (lightprobe_irradiance_grid_local_coord(grids_infos_buf[i], P, lP)) {
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index = i;
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#ifdef IRRADIANCE_GRID_SAMPLING
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float distance_to_border = reduce_min(min(lP, vec3(grids_infos_buf[i].grid_size) - lP));
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if (distance_to_border < random) {
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/* Remap random to the remaining interval. */
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random = (random - distance_to_border) / (1.0 - distance_to_border);
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/* Try to sample another grid to get smooth transitions at borders. */
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continue;
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}
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#endif
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break;
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}
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}
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IrradianceGridData grid_data = grids_infos_buf[index];
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/* TODO(fclem): Make sure this is working as expected. */
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mat3x3 world_to_grid_transposed = mat3x3(grid_data.world_to_grid_transposed);
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vec3 lNg = safe_normalize(world_to_grid_transposed * Ng);
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vec3 lV = safe_normalize(V * world_to_grid_transposed);
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if (do_bias) {
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/* Shading point bias. */
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lP += lNg * grid_data.normal_bias;
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lP += lV * grid_data.view_bias;
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}
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else {
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lNg = vec3(0.0);
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}
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ivec3 brick_coord = lightprobe_irradiance_grid_brick_coord(lP);
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int brick_index = lightprobe_irradiance_grid_brick_index_get(grid_data, brick_coord);
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IrradianceBrick brick = irradiance_brick_unpack(bricks_infos_buf[brick_index]);
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vec3 brick_lP = lightprobe_irradiance_grid_brick_local_coord(grid_data, lP, brick_coord);
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/* Sampling point bias. */
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brick_lP = lightprobe_irradiance_grid_bias_sample_coord(
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grid_data, brick.atlas_coord, brick_lP, lNg);
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vec3 atlas_coord = vec3(vec2(brick.atlas_coord), 0.0) + brick_lP;
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return lightprobe_irradiance_sample_atlas(atlas_tx, atlas_coord);
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}
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SphericalHarmonicL1 lightprobe_irradiance_world()
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{
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return lightprobe_irradiance_sample_atlas(irradiance_atlas_tx, vec3(0.0));
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}
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SphericalHarmonicL1 lightprobe_irradiance_sample(vec3 P)
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{
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return lightprobe_irradiance_sample(irradiance_atlas_tx, P, vec3(0), vec3(0), false);
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}
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SphericalHarmonicL1 lightprobe_irradiance_sample(vec3 P, vec3 V, vec3 Ng)
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{
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return lightprobe_irradiance_sample(irradiance_atlas_tx, P, V, Ng, true);
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}
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#pragma BLENDER_REQUIRE(eevee_lightprobe_volume_eval_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_sampling_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_spherical_harmonics_lib.glsl)
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#ifdef REFLECTION_PROBE
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@@ -14,7 +14,7 @@
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#pragma BLENDER_REQUIRE(gpu_shader_math_vector_lib.glsl)
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#pragma BLENDER_REQUIRE(gpu_shader_math_matrix_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_spherical_harmonics_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_lightprobe_eval_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_lightprobe_volume_eval_lib.glsl)
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void atlas_store(vec4 sh_coefficient, ivec2 atlas_coord, int layer)
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{
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@@ -0,0 +1,208 @@
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/* SPDX-FileCopyrightText: 2023 Blender Authors
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*
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* SPDX-License-Identifier: GPL-2.0-or-later */
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/**
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* The resources expected to be defined are:
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* - grids_infos_buf
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* - bricks_infos_buf
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* - irradiance_atlas_tx
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* Needed for sampling (not for upload):
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* - util_tx
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* - sampling_buf
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*/
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#pragma BLENDER_REQUIRE(gpu_shader_math_base_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_lightprobe_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_spherical_harmonics_lib.glsl)
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#pragma BLENDER_REQUIRE(eevee_sampling_lib.glsl)
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/**
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* Return the brick coordinate inside the grid.
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*/
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ivec3 lightprobe_irradiance_grid_brick_coord(vec3 lP)
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{
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ivec3 brick_coord = ivec3((lP - 0.5) / float(IRRADIANCE_GRID_BRICK_SIZE - 1));
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/* Avoid sampling adjacent bricks. */
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return max(brick_coord, ivec3(0));
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}
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/**
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* Return the local coordinated of the shading point inside the brick in unnormalized coordinate.
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*/
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vec3 lightprobe_irradiance_grid_brick_local_coord(IrradianceGridData grid_data,
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vec3 lP,
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ivec3 brick_coord)
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{
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/* Avoid sampling adjacent bricks around the origin. */
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lP = max(lP, vec3(0.5));
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/* Local position inside the brick (still in grid sample spacing unit). */
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vec3 brick_lP = lP - vec3(brick_coord) * float(IRRADIANCE_GRID_BRICK_SIZE - 1);
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return brick_lP;
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}
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/**
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* Return the biased local brick local coordinated.
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*/
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vec3 lightprobe_irradiance_grid_bias_sample_coord(IrradianceGridData grid_data,
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uvec2 brick_atlas_coord,
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vec3 brick_lP,
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vec3 lNg)
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{
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/* A cell is the interpolation region between 8 texels. */
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vec3 cell_lP = brick_lP - 0.5;
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vec3 cell_start = floor(cell_lP);
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vec3 cell_fract = cell_lP - cell_start;
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/* NOTE(fclem): Use uint to avoid signed int modulo. */
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uint vis_comp = uint(cell_start.z) % 4u;
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/* Visibility is stored after the irradiance. */
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ivec3 vis_coord = ivec3(ivec2(brick_atlas_coord), IRRADIANCE_GRID_BRICK_SIZE * 4) +
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ivec3(cell_start);
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/* Visibility is stored packed 1 cell per channel. */
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vis_coord.z -= int(vis_comp);
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float cell_visibility = texelFetch(irradiance_atlas_tx, vis_coord, 0)[vis_comp];
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int cell_visibility_bits = int(cell_visibility);
|
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/**
|
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* References:
|
||||
*
|
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* "Probe-based lighting, strand-based hair system, and physical hair shading in Unity’s Enemies"
|
||||
* by Francesco Cifariello Ciardi, Lasse Jon Fuglsang Pedersen and John Parsaie.
|
||||
*
|
||||
* "Multi-Scale Global Illumination in Quantum Break"
|
||||
* by Ari Silvennoinen and Ville Timonen.
|
||||
*
|
||||
* “Dynamic Diffuse Global Illumination with Ray-Traced Irradiance Fields”
|
||||
* by Morgan McGuire.
|
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*/
|
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float trilinear_weights[8];
|
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float total_weight = 0.0;
|
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for (int i = 0; i < 8; i++) {
|
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ivec3 sample_position = lightprobe_irradiance_grid_cell_corner(i);
|
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vec3 trilinear = select(1.0 - cell_fract, cell_fract, bvec3(sample_position));
|
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float positional_weight = trilinear.x * trilinear.y * trilinear.z;
|
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|
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float len;
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vec3 corner_vec = vec3(sample_position) - cell_fract;
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vec3 corner_dir = normalize_and_get_length(corner_vec, len);
|
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float cos_theta = (len > 1e-8) ? dot(lNg, corner_dir) : 1.0;
|
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float geometry_weight = saturate(cos_theta * 0.5 + 0.5);
|
||||
|
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float validity_weight = float((cell_visibility_bits >> i) & 1);
|
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|
||||
/* Biases. See McGuire's presentation. */
|
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positional_weight += 0.001;
|
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geometry_weight = square(geometry_weight) + 0.2 + grid_data.facing_bias;
|
||||
|
||||
trilinear_weights[i] = saturate(positional_weight * geometry_weight * validity_weight);
|
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total_weight += trilinear_weights[i];
|
||||
}
|
||||
float total_weight_inv = safe_rcp(total_weight);
|
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|
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vec3 trilinear_coord = vec3(0.0);
|
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for (int i = 0; i < 8; i++) {
|
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vec3 sample_position = vec3((ivec3(i) >> ivec3(0, 1, 2)) & 1);
|
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trilinear_coord += sample_position * trilinear_weights[i] * total_weight_inv;
|
||||
}
|
||||
/* Replace sampling coordinates with manually weighted trilinear coordinates. */
|
||||
return 0.5 + cell_start + trilinear_coord;
|
||||
}
|
||||
|
||||
SphericalHarmonicL1 lightprobe_irradiance_sample_atlas(sampler3D atlas_tx, vec3 atlas_coord)
|
||||
{
|
||||
vec4 texture_coord = vec4(atlas_coord, float(IRRADIANCE_GRID_BRICK_SIZE)) /
|
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vec3(textureSize(atlas_tx, 0)).xyzz;
|
||||
SphericalHarmonicL1 sh;
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sh.L0.M0 = textureLod(atlas_tx, texture_coord.xyz, 0.0);
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texture_coord.z += texture_coord.w;
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sh.L1.Mn1 = textureLod(atlas_tx, texture_coord.xyz, 0.0);
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texture_coord.z += texture_coord.w;
|
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sh.L1.M0 = textureLod(atlas_tx, texture_coord.xyz, 0.0);
|
||||
texture_coord.z += texture_coord.w;
|
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sh.L1.Mp1 = textureLod(atlas_tx, texture_coord.xyz, 0.0);
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return sh;
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||||
}
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||||
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SphericalHarmonicL1 lightprobe_irradiance_sample(
|
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sampler3D atlas_tx, vec3 P, vec3 V, vec3 Ng, const bool do_bias)
|
||||
{
|
||||
vec3 lP;
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int index = -1;
|
||||
int i = 0;
|
||||
#ifdef IRRADIANCE_GRID_UPLOAD
|
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i = grid_start_index;
|
||||
#endif
|
||||
#ifdef IRRADIANCE_GRID_SAMPLING
|
||||
float random = interlieved_gradient_noise(UTIL_TEXEL, 0.0, 0.0);
|
||||
random = fract(random + sampling_rng_1D_get(SAMPLING_LIGHTPROBE));
|
||||
#endif
|
||||
for (; i < IRRADIANCE_GRID_MAX; i++) {
|
||||
/* Last grid is tagged as invalid to stop the iteration. */
|
||||
if (grids_infos_buf[i].grid_size.x == -1) {
|
||||
/* Sample the last grid instead. */
|
||||
index = i - 1;
|
||||
break;
|
||||
}
|
||||
|
||||
/* If sample fall inside the grid, step out of the loop. */
|
||||
if (lightprobe_irradiance_grid_local_coord(grids_infos_buf[i], P, lP)) {
|
||||
index = i;
|
||||
#ifdef IRRADIANCE_GRID_SAMPLING
|
||||
float distance_to_border = reduce_min(min(lP, vec3(grids_infos_buf[i].grid_size) - lP));
|
||||
if (distance_to_border < random) {
|
||||
/* Remap random to the remaining interval. */
|
||||
random = (random - distance_to_border) / (1.0 - distance_to_border);
|
||||
/* Try to sample another grid to get smooth transitions at borders. */
|
||||
continue;
|
||||
}
|
||||
#endif
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
IrradianceGridData grid_data = grids_infos_buf[index];
|
||||
|
||||
/* TODO(fclem): Make sure this is working as expected. */
|
||||
mat3x3 world_to_grid_transposed = mat3x3(grid_data.world_to_grid_transposed);
|
||||
vec3 lNg = safe_normalize(world_to_grid_transposed * Ng);
|
||||
vec3 lV = safe_normalize(V * world_to_grid_transposed);
|
||||
|
||||
if (do_bias) {
|
||||
/* Shading point bias. */
|
||||
lP += lNg * grid_data.normal_bias;
|
||||
lP += lV * grid_data.view_bias;
|
||||
}
|
||||
else {
|
||||
lNg = vec3(0.0);
|
||||
}
|
||||
|
||||
ivec3 brick_coord = lightprobe_irradiance_grid_brick_coord(lP);
|
||||
int brick_index = lightprobe_irradiance_grid_brick_index_get(grid_data, brick_coord);
|
||||
IrradianceBrick brick = irradiance_brick_unpack(bricks_infos_buf[brick_index]);
|
||||
|
||||
vec3 brick_lP = lightprobe_irradiance_grid_brick_local_coord(grid_data, lP, brick_coord);
|
||||
|
||||
/* Sampling point bias. */
|
||||
brick_lP = lightprobe_irradiance_grid_bias_sample_coord(
|
||||
grid_data, brick.atlas_coord, brick_lP, lNg);
|
||||
|
||||
vec3 atlas_coord = vec3(vec2(brick.atlas_coord), 0.0) + brick_lP;
|
||||
|
||||
return lightprobe_irradiance_sample_atlas(atlas_tx, atlas_coord);
|
||||
}
|
||||
|
||||
SphericalHarmonicL1 lightprobe_irradiance_world()
|
||||
{
|
||||
return lightprobe_irradiance_sample_atlas(irradiance_atlas_tx, vec3(0.0));
|
||||
}
|
||||
|
||||
SphericalHarmonicL1 lightprobe_irradiance_sample(vec3 P)
|
||||
{
|
||||
return lightprobe_irradiance_sample(irradiance_atlas_tx, P, vec3(0), vec3(0), false);
|
||||
}
|
||||
|
||||
SphericalHarmonicL1 lightprobe_irradiance_sample(vec3 P, vec3 V, vec3 Ng)
|
||||
{
|
||||
return lightprobe_irradiance_sample(irradiance_atlas_tx, P, V, Ng, true);
|
||||
}
|
||||
@@ -7,7 +7,8 @@
|
||||
* irradiance cache from each spherical probe location except for the world probe.
|
||||
*/
|
||||
|
||||
#pragma BLENDER_REQUIRE(eevee_lightprobe_eval_lib.glsl)
|
||||
#pragma BLENDER_REQUIRE(eevee_reflection_probe_lib.glsl)
|
||||
#pragma BLENDER_REQUIRE(eevee_lightprobe_volume_eval_lib.glsl)
|
||||
|
||||
void main()
|
||||
{
|
||||
|
||||
Reference in New Issue
Block a user