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385ee5c70b
This allows light sources to be specified in physical light units in addition to the regular energy multiplier. In order to avoid loss of precision at high values, brightness values are premultiplied by an exposure normalization value. In support of Physical Light Units this PR also renames CameraEffects to CameraAttributes.
614 lines
20 KiB
GLSL
614 lines
20 KiB
GLSL
#[compute]
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#version 450
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#VERSION_DEFINES
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layout(local_size_x = 8, local_size_y = 8, local_size_z = 1) in;
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#define MAX_CASCADES 8
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layout(set = 0, binding = 1) uniform texture3D sdf_cascades[MAX_CASCADES];
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layout(set = 0, binding = 2) uniform texture3D light_cascades[MAX_CASCADES];
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layout(set = 0, binding = 3) uniform texture3D aniso0_cascades[MAX_CASCADES];
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layout(set = 0, binding = 4) uniform texture3D aniso1_cascades[MAX_CASCADES];
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layout(set = 0, binding = 6) uniform sampler linear_sampler;
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struct CascadeData {
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vec3 offset; //offset of (0,0,0) in world coordinates
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float to_cell; // 1/bounds * grid_size
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ivec3 probe_world_offset;
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uint pad;
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vec4 pad2;
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};
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layout(set = 0, binding = 7, std140) uniform Cascades {
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CascadeData data[MAX_CASCADES];
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}
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cascades;
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layout(r32ui, set = 0, binding = 8) uniform restrict uimage2DArray lightprobe_texture_data;
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layout(rgba16i, set = 0, binding = 9) uniform restrict iimage2DArray lightprobe_history_texture;
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layout(rgba32i, set = 0, binding = 10) uniform restrict iimage2D lightprobe_average_texture;
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//used for scrolling
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layout(rgba16i, set = 0, binding = 11) uniform restrict iimage2DArray lightprobe_history_scroll_texture;
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layout(rgba32i, set = 0, binding = 12) uniform restrict iimage2D lightprobe_average_scroll_texture;
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layout(rgba32i, set = 0, binding = 13) uniform restrict iimage2D lightprobe_average_parent_texture;
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layout(rgba16f, set = 0, binding = 14) uniform restrict writeonly image2DArray lightprobe_ambient_texture;
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#ifdef USE_CUBEMAP_ARRAY
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layout(set = 1, binding = 0) uniform textureCubeArray sky_irradiance;
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#else
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layout(set = 1, binding = 0) uniform textureCube sky_irradiance;
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#endif
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layout(set = 1, binding = 1) uniform sampler linear_sampler_mipmaps;
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#define HISTORY_BITS 10
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#define SKY_MODE_DISABLED 0
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#define SKY_MODE_COLOR 1
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#define SKY_MODE_SKY 2
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layout(push_constant, std430) uniform Params {
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vec3 grid_size;
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uint max_cascades;
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uint probe_axis_size;
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uint cascade;
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uint history_index;
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uint history_size;
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uint ray_count;
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float ray_bias;
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ivec2 image_size;
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ivec3 world_offset;
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uint sky_mode;
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ivec3 scroll;
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float sky_energy;
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vec3 sky_color;
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float y_mult;
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bool store_ambient_texture;
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uint pad[3];
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}
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params;
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const float PI = 3.14159265f;
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const float GOLDEN_ANGLE = PI * (3.0 - sqrt(5.0));
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vec3 vogel_hemisphere(uint p_index, uint p_count, float p_offset) {
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float r = sqrt(float(p_index) + 0.5f) / sqrt(float(p_count));
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float theta = float(p_index) * GOLDEN_ANGLE + p_offset;
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float y = cos(r * PI * 0.5);
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float l = sin(r * PI * 0.5);
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return vec3(l * cos(theta), l * sin(theta), y * (float(p_index & 1) * 2.0 - 1.0));
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}
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uvec3 hash3(uvec3 x) {
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x = ((x >> 16) ^ x) * 0x45d9f3b;
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x = ((x >> 16) ^ x) * 0x45d9f3b;
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x = (x >> 16) ^ x;
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return x;
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}
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float hashf3(vec3 co) {
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return fract(sin(dot(co, vec3(12.9898, 78.233, 137.13451))) * 43758.5453);
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}
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vec3 octahedron_encode(vec2 f) {
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// https://twitter.com/Stubbesaurus/status/937994790553227264
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f = f * 2.0 - 1.0;
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vec3 n = vec3(f.x, f.y, 1.0f - abs(f.x) - abs(f.y));
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float t = clamp(-n.z, 0.0, 1.0);
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n.x += n.x >= 0 ? -t : t;
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n.y += n.y >= 0 ? -t : t;
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return normalize(n);
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}
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uint rgbe_encode(vec3 color) {
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const float pow2to9 = 512.0f;
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const float B = 15.0f;
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const float N = 9.0f;
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const float LN2 = 0.6931471805599453094172321215;
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float cRed = clamp(color.r, 0.0, 65408.0);
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float cGreen = clamp(color.g, 0.0, 65408.0);
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float cBlue = clamp(color.b, 0.0, 65408.0);
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float cMax = max(cRed, max(cGreen, cBlue));
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float expp = max(-B - 1.0f, floor(log(cMax) / LN2)) + 1.0f + B;
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float sMax = floor((cMax / pow(2.0f, expp - B - N)) + 0.5f);
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float exps = expp + 1.0f;
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if (0.0 <= sMax && sMax < pow2to9) {
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exps = expp;
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}
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float sRed = floor((cRed / pow(2.0f, exps - B - N)) + 0.5f);
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float sGreen = floor((cGreen / pow(2.0f, exps - B - N)) + 0.5f);
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float sBlue = floor((cBlue / pow(2.0f, exps - B - N)) + 0.5f);
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return (uint(sRed) & 0x1FF) | ((uint(sGreen) & 0x1FF) << 9) | ((uint(sBlue) & 0x1FF) << 18) | ((uint(exps) & 0x1F) << 27);
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}
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struct SH {
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#if (SH_SIZE == 16)
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float c[48];
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#else
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float c[28];
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#endif
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};
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shared SH sh_accum[64]; //8x8
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void main() {
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ivec2 pos = ivec2(gl_GlobalInvocationID.xy);
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if (any(greaterThanEqual(pos, params.image_size))) { //too large, do nothing
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return;
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}
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uint probe_index = gl_LocalInvocationID.x + gl_LocalInvocationID.y * 8;
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#ifdef MODE_PROCESS
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float probe_cell_size = float(params.grid_size.x / float(params.probe_axis_size - 1)) / cascades.data[params.cascade].to_cell;
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ivec3 probe_cell;
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probe_cell.x = pos.x % int(params.probe_axis_size);
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probe_cell.y = pos.y;
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probe_cell.z = pos.x / int(params.probe_axis_size);
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vec3 probe_pos = cascades.data[params.cascade].offset + vec3(probe_cell) * probe_cell_size;
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vec3 pos_to_uvw = 1.0 / params.grid_size;
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for (uint i = 0; i < SH_SIZE * 3; i++) {
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sh_accum[probe_index].c[i] = 0.0;
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}
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// quickly ensure each probe has a different "offset" for the vogel function, based on integer world position
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uvec3 h3 = hash3(uvec3(params.world_offset + probe_cell));
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float offset = hashf3(vec3(h3 & uvec3(0xFFFFF)));
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//for a more homogeneous hemisphere, alternate based on history frames
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uint ray_offset = params.history_index;
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uint ray_mult = params.history_size;
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uint ray_total = ray_mult * params.ray_count;
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for (uint i = 0; i < params.ray_count; i++) {
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vec3 ray_dir = vogel_hemisphere(ray_offset + i * ray_mult, ray_total, offset);
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ray_dir.y *= params.y_mult;
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ray_dir = normalize(ray_dir);
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//needs to be visible
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vec3 ray_pos = probe_pos;
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vec3 inv_dir = 1.0 / ray_dir;
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bool hit = false;
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uint hit_cascade;
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float bias = params.ray_bias;
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vec3 abs_ray_dir = abs(ray_dir);
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ray_pos += ray_dir * 1.0 / max(abs_ray_dir.x, max(abs_ray_dir.y, abs_ray_dir.z)) * bias / cascades.data[params.cascade].to_cell;
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vec3 uvw;
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for (uint j = params.cascade; j < params.max_cascades; j++) {
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//convert to local bounds
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vec3 pos = ray_pos - cascades.data[j].offset;
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pos *= cascades.data[j].to_cell;
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if (any(lessThan(pos, vec3(0.0))) || any(greaterThanEqual(pos, params.grid_size))) {
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continue; //already past bounds for this cascade, goto next
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}
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//find maximum advance distance (until reaching bounds)
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vec3 t0 = -pos * inv_dir;
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vec3 t1 = (params.grid_size - pos) * inv_dir;
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vec3 tmax = max(t0, t1);
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float max_advance = min(tmax.x, min(tmax.y, tmax.z));
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float advance = 0.0;
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while (advance < max_advance) {
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//read how much to advance from SDF
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uvw = (pos + ray_dir * advance) * pos_to_uvw;
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float distance = texture(sampler3D(sdf_cascades[j], linear_sampler), uvw).r * 255.0 - 1.0;
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if (distance < 0.05) {
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//consider hit
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hit = true;
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break;
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}
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advance += distance;
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}
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if (hit) {
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hit_cascade = j;
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break;
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}
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//change ray origin to collision with bounds
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pos += ray_dir * max_advance;
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pos /= cascades.data[j].to_cell;
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pos += cascades.data[j].offset;
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ray_pos = pos;
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}
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vec4 light;
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if (hit) {
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//avoid reading different texture from different threads
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for (uint j = params.cascade; j < params.max_cascades; j++) {
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if (j == hit_cascade) {
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const float EPSILON = 0.001;
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vec3 hit_normal = normalize(vec3(
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texture(sampler3D(sdf_cascades[hit_cascade], linear_sampler), uvw + vec3(EPSILON, 0.0, 0.0)).r - texture(sampler3D(sdf_cascades[hit_cascade], linear_sampler), uvw - vec3(EPSILON, 0.0, 0.0)).r,
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texture(sampler3D(sdf_cascades[hit_cascade], linear_sampler), uvw + vec3(0.0, EPSILON, 0.0)).r - texture(sampler3D(sdf_cascades[hit_cascade], linear_sampler), uvw - vec3(0.0, EPSILON, 0.0)).r,
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texture(sampler3D(sdf_cascades[hit_cascade], linear_sampler), uvw + vec3(0.0, 0.0, EPSILON)).r - texture(sampler3D(sdf_cascades[hit_cascade], linear_sampler), uvw - vec3(0.0, 0.0, EPSILON)).r));
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vec3 hit_light = texture(sampler3D(light_cascades[hit_cascade], linear_sampler), uvw).rgb;
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vec4 aniso0 = texture(sampler3D(aniso0_cascades[hit_cascade], linear_sampler), uvw);
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vec3 hit_aniso0 = aniso0.rgb;
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vec3 hit_aniso1 = vec3(aniso0.a, texture(sampler3D(aniso1_cascades[hit_cascade], linear_sampler), uvw).rg);
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//one liner magic
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light.rgb = hit_light * (dot(max(vec3(0.0), (hit_normal * hit_aniso0)), vec3(1.0)) + dot(max(vec3(0.0), (-hit_normal * hit_aniso1)), vec3(1.0)));
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light.a = 1.0;
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}
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}
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} else if (params.sky_mode == SKY_MODE_SKY) {
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#ifdef USE_CUBEMAP_ARRAY
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light.rgb = textureLod(samplerCubeArray(sky_irradiance, linear_sampler_mipmaps), vec4(ray_dir, 0.0), 2.0).rgb; // Use second mipmap because we don't usually throw a lot of rays, so this compensates.
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#else
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light.rgb = textureLod(samplerCube(sky_irradiance, linear_sampler_mipmaps), ray_dir, 2.0).rgb; // Use second mipmap because we don't usually throw a lot of rays, so this compensates.
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#endif
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light.rgb *= params.sky_energy;
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light.a = 0.0;
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} else if (params.sky_mode == SKY_MODE_COLOR) {
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light.rgb = params.sky_color;
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light.rgb *= params.sky_energy;
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light.a = 0.0;
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} else {
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light = vec4(0, 0, 0, 0);
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}
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vec3 ray_dir2 = ray_dir * ray_dir;
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#define SH_ACCUM(m_idx, m_value) \
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{ \
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vec3 l = light.rgb * (m_value); \
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sh_accum[probe_index].c[m_idx * 3 + 0] += l.r; \
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sh_accum[probe_index].c[m_idx * 3 + 1] += l.g; \
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sh_accum[probe_index].c[m_idx * 3 + 2] += l.b; \
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}
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SH_ACCUM(0, 0.282095); //l0
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SH_ACCUM(1, 0.488603 * ray_dir.y); //l1n1
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SH_ACCUM(2, 0.488603 * ray_dir.z); //l1n0
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SH_ACCUM(3, 0.488603 * ray_dir.x); //l1p1
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SH_ACCUM(4, 1.092548 * ray_dir.x * ray_dir.y); //l2n2
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SH_ACCUM(5, 1.092548 * ray_dir.y * ray_dir.z); //l2n1
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SH_ACCUM(6, 0.315392 * (3.0 * ray_dir2.z - 1.0)); //l20
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SH_ACCUM(7, 1.092548 * ray_dir.x * ray_dir.z); //l2p1
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SH_ACCUM(8, 0.546274 * (ray_dir2.x - ray_dir2.y)); //l2p2
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#if (SH_SIZE == 16)
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SH_ACCUM(9, 0.590043 * ray_dir.y * (3.0f * ray_dir2.x - ray_dir2.y));
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SH_ACCUM(10, 2.890611 * ray_dir.y * ray_dir.x * ray_dir.z);
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SH_ACCUM(11, 0.646360 * ray_dir.y * (-1.0f + 5.0f * ray_dir2.z));
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SH_ACCUM(12, 0.373176 * (5.0f * ray_dir2.z * ray_dir.z - 3.0f * ray_dir.z));
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SH_ACCUM(13, 0.457045 * ray_dir.x * (-1.0f + 5.0f * ray_dir2.z));
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SH_ACCUM(14, 1.445305 * (ray_dir2.x - ray_dir2.y) * ray_dir.z);
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SH_ACCUM(15, 0.590043 * ray_dir.x * (ray_dir2.x - 3.0f * ray_dir2.y));
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#endif
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}
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for (uint i = 0; i < SH_SIZE; i++) {
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// store in history texture
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ivec3 prev_pos = ivec3(pos.x, pos.y * SH_SIZE + i, int(params.history_index));
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ivec2 average_pos = prev_pos.xy;
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vec4 value = vec4(sh_accum[probe_index].c[i * 3 + 0], sh_accum[probe_index].c[i * 3 + 1], sh_accum[probe_index].c[i * 3 + 2], 1.0) * 4.0 / float(params.ray_count);
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ivec4 ivalue = clamp(ivec4(value * float(1 << HISTORY_BITS)), -32768, 32767); //clamp to 16 bits, so higher values don't break average
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ivec4 prev_value = imageLoad(lightprobe_history_texture, prev_pos);
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ivec4 average = imageLoad(lightprobe_average_texture, average_pos);
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average -= prev_value;
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average += ivalue;
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imageStore(lightprobe_history_texture, prev_pos, ivalue);
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imageStore(lightprobe_average_texture, average_pos, average);
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if (params.store_ambient_texture && i == 0) {
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ivec3 ambient_pos = ivec3(pos, int(params.cascade));
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vec4 ambient_light = (vec4(average) / float(params.history_size)) / float(1 << HISTORY_BITS);
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ambient_light *= 0.88622; // SHL0
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imageStore(lightprobe_ambient_texture, ambient_pos, ambient_light);
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}
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}
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#endif // MODE PROCESS
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#ifdef MODE_STORE
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// converting to octahedral in this step is required because
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// octahedral is much faster to read from the screen than spherical harmonics,
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// despite the very slight quality loss
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ivec2 sh_pos = (pos / OCT_SIZE) * ivec2(1, SH_SIZE);
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ivec2 oct_pos = (pos / OCT_SIZE) * (OCT_SIZE + 2) + ivec2(1);
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ivec2 local_pos = pos % OCT_SIZE;
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//compute the octahedral normal for this texel
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vec3 normal = octahedron_encode(vec2(local_pos) / float(OCT_SIZE));
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// read the spherical harmonic
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vec3 normal2 = normal * normal;
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float c[SH_SIZE] = float[](
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0.282095, //l0
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0.488603 * normal.y, //l1n1
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0.488603 * normal.z, //l1n0
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0.488603 * normal.x, //l1p1
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1.092548 * normal.x * normal.y, //l2n2
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1.092548 * normal.y * normal.z, //l2n1
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0.315392 * (3.0 * normal2.z - 1.0), //l20
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1.092548 * normal.x * normal.z, //l2p1
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0.546274 * (normal2.x - normal2.y) //l2p2
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#if (SH_SIZE == 16)
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,
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0.590043 * normal.y * (3.0f * normal2.x - normal2.y),
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2.890611 * normal.y * normal.x * normal.z,
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0.646360 * normal.y * (-1.0f + 5.0f * normal2.z),
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0.373176 * (5.0f * normal2.z * normal.z - 3.0f * normal.z),
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0.457045 * normal.x * (-1.0f + 5.0f * normal2.z),
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1.445305 * (normal2.x - normal2.y) * normal.z,
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0.590043 * normal.x * (normal2.x - 3.0f * normal2.y)
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#endif
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);
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const float l_mult[SH_SIZE] = float[](
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1.0,
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2.0 / 3.0,
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2.0 / 3.0,
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2.0 / 3.0,
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1.0 / 4.0,
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1.0 / 4.0,
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1.0 / 4.0,
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1.0 / 4.0,
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1.0 / 4.0
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#if (SH_SIZE == 16)
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, // l4 does not contribute to irradiance
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0.0,
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0.0,
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0.0,
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0.0,
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0.0,
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0.0,
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0.0
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#endif
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);
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vec3 irradiance = vec3(0.0);
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vec3 radiance = vec3(0.0);
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for (uint i = 0; i < SH_SIZE; i++) {
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// store in history texture
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ivec2 average_pos = sh_pos + ivec2(0, i);
|
|
ivec4 average = imageLoad(lightprobe_average_texture, average_pos);
|
|
|
|
vec4 sh = (vec4(average) / float(params.history_size)) / float(1 << HISTORY_BITS);
|
|
|
|
vec3 m = sh.rgb * c[i] * 4.0;
|
|
|
|
irradiance += m * l_mult[i];
|
|
radiance += m;
|
|
}
|
|
|
|
//encode RGBE9995 for the final texture
|
|
|
|
uint irradiance_rgbe = rgbe_encode(irradiance);
|
|
uint radiance_rgbe = rgbe_encode(radiance);
|
|
|
|
//store in octahedral map
|
|
|
|
ivec3 texture_pos = ivec3(oct_pos, int(params.cascade));
|
|
ivec3 copy_to[4] = ivec3[](ivec3(-2, -2, -2), ivec3(-2, -2, -2), ivec3(-2, -2, -2), ivec3(-2, -2, -2));
|
|
copy_to[0] = texture_pos + ivec3(local_pos, 0);
|
|
|
|
if (local_pos == ivec2(0, 0)) {
|
|
copy_to[1] = texture_pos + ivec3(OCT_SIZE - 1, -1, 0);
|
|
copy_to[2] = texture_pos + ivec3(-1, OCT_SIZE - 1, 0);
|
|
copy_to[3] = texture_pos + ivec3(OCT_SIZE, OCT_SIZE, 0);
|
|
} else if (local_pos == ivec2(OCT_SIZE - 1, 0)) {
|
|
copy_to[1] = texture_pos + ivec3(0, -1, 0);
|
|
copy_to[2] = texture_pos + ivec3(OCT_SIZE, OCT_SIZE - 1, 0);
|
|
copy_to[3] = texture_pos + ivec3(-1, OCT_SIZE, 0);
|
|
} else if (local_pos == ivec2(0, OCT_SIZE - 1)) {
|
|
copy_to[1] = texture_pos + ivec3(-1, 0, 0);
|
|
copy_to[2] = texture_pos + ivec3(OCT_SIZE - 1, OCT_SIZE, 0);
|
|
copy_to[3] = texture_pos + ivec3(OCT_SIZE, -1, 0);
|
|
} else if (local_pos == ivec2(OCT_SIZE - 1, OCT_SIZE - 1)) {
|
|
copy_to[1] = texture_pos + ivec3(0, OCT_SIZE, 0);
|
|
copy_to[2] = texture_pos + ivec3(OCT_SIZE, 0, 0);
|
|
copy_to[3] = texture_pos + ivec3(-1, -1, 0);
|
|
} else if (local_pos.y == 0) {
|
|
copy_to[1] = texture_pos + ivec3(OCT_SIZE - local_pos.x - 1, local_pos.y - 1, 0);
|
|
} else if (local_pos.x == 0) {
|
|
copy_to[1] = texture_pos + ivec3(local_pos.x - 1, OCT_SIZE - local_pos.y - 1, 0);
|
|
} else if (local_pos.y == OCT_SIZE - 1) {
|
|
copy_to[1] = texture_pos + ivec3(OCT_SIZE - local_pos.x - 1, local_pos.y + 1, 0);
|
|
} else if (local_pos.x == OCT_SIZE - 1) {
|
|
copy_to[1] = texture_pos + ivec3(local_pos.x + 1, OCT_SIZE - local_pos.y - 1, 0);
|
|
}
|
|
|
|
for (int i = 0; i < 4; i++) {
|
|
if (copy_to[i] == ivec3(-2, -2, -2)) {
|
|
continue;
|
|
}
|
|
imageStore(lightprobe_texture_data, copy_to[i], uvec4(irradiance_rgbe));
|
|
imageStore(lightprobe_texture_data, copy_to[i] + ivec3(0, 0, int(params.max_cascades)), uvec4(radiance_rgbe));
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef MODE_SCROLL
|
|
|
|
ivec3 probe_cell;
|
|
probe_cell.x = pos.x % int(params.probe_axis_size);
|
|
probe_cell.y = pos.y;
|
|
probe_cell.z = pos.x / int(params.probe_axis_size);
|
|
|
|
ivec3 read_probe = probe_cell - params.scroll;
|
|
|
|
if (all(greaterThanEqual(read_probe, ivec3(0))) && all(lessThan(read_probe, ivec3(params.probe_axis_size)))) {
|
|
// can scroll
|
|
ivec2 tex_pos;
|
|
tex_pos = read_probe.xy;
|
|
tex_pos.x += read_probe.z * int(params.probe_axis_size);
|
|
|
|
//scroll
|
|
for (uint j = 0; j < params.history_size; j++) {
|
|
for (int i = 0; i < SH_SIZE; i++) {
|
|
// copy from history texture
|
|
ivec3 src_pos = ivec3(tex_pos.x, tex_pos.y * SH_SIZE + i, int(j));
|
|
ivec3 dst_pos = ivec3(pos.x, pos.y * SH_SIZE + i, int(j));
|
|
ivec4 value = imageLoad(lightprobe_history_texture, src_pos);
|
|
imageStore(lightprobe_history_scroll_texture, dst_pos, value);
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < SH_SIZE; i++) {
|
|
// copy from average texture
|
|
ivec2 src_pos = ivec2(tex_pos.x, tex_pos.y * SH_SIZE + i);
|
|
ivec2 dst_pos = ivec2(pos.x, pos.y * SH_SIZE + i);
|
|
ivec4 value = imageLoad(lightprobe_average_texture, src_pos);
|
|
imageStore(lightprobe_average_scroll_texture, dst_pos, value);
|
|
}
|
|
} else if (params.cascade < params.max_cascades - 1) {
|
|
//can't scroll, must look for position in parent cascade
|
|
|
|
//to global coords
|
|
float cell_to_probe = float(params.grid_size.x / float(params.probe_axis_size - 1));
|
|
|
|
float probe_cell_size = cell_to_probe / cascades.data[params.cascade].to_cell;
|
|
vec3 probe_pos = cascades.data[params.cascade].offset + vec3(probe_cell) * probe_cell_size;
|
|
|
|
//to parent local coords
|
|
float probe_cell_size_next = cell_to_probe / cascades.data[params.cascade + 1].to_cell;
|
|
probe_pos -= cascades.data[params.cascade + 1].offset;
|
|
probe_pos /= probe_cell_size_next;
|
|
|
|
ivec3 probe_posi = ivec3(probe_pos);
|
|
//add up all light, no need to use occlusion here, since occlusion will do its work afterwards
|
|
|
|
vec4 average_light[SH_SIZE] = vec4[](vec4(0), vec4(0), vec4(0), vec4(0), vec4(0), vec4(0), vec4(0), vec4(0), vec4(0)
|
|
#if (SH_SIZE == 16)
|
|
,
|
|
vec4(0), vec4(0), vec4(0), vec4(0), vec4(0), vec4(0), vec4(0)
|
|
#endif
|
|
);
|
|
float total_weight = 0.0;
|
|
|
|
for (int i = 0; i < 8; i++) {
|
|
ivec3 offset = probe_posi + ((ivec3(i) >> ivec3(0, 1, 2)) & ivec3(1, 1, 1));
|
|
|
|
vec3 trilinear = vec3(1.0) - abs(probe_pos - vec3(offset));
|
|
float weight = trilinear.x * trilinear.y * trilinear.z;
|
|
|
|
ivec2 tex_pos;
|
|
tex_pos = offset.xy;
|
|
tex_pos.x += offset.z * int(params.probe_axis_size);
|
|
|
|
for (int j = 0; j < SH_SIZE; j++) {
|
|
// copy from history texture
|
|
ivec2 src_pos = ivec2(tex_pos.x, tex_pos.y * SH_SIZE + j);
|
|
ivec4 average = imageLoad(lightprobe_average_parent_texture, src_pos);
|
|
vec4 value = (vec4(average) / float(params.history_size)) / float(1 << HISTORY_BITS);
|
|
average_light[j] += value * weight;
|
|
}
|
|
|
|
total_weight += weight;
|
|
}
|
|
|
|
if (total_weight > 0.0) {
|
|
total_weight = 1.0 / total_weight;
|
|
}
|
|
//store the averaged values everywhere
|
|
|
|
for (int i = 0; i < SH_SIZE; i++) {
|
|
ivec4 ivalue = clamp(ivec4(average_light[i] * total_weight * float(1 << HISTORY_BITS)), ivec4(-32768), ivec4(32767)); //clamp to 16 bits, so higher values don't break average
|
|
// copy from history texture
|
|
ivec3 dst_pos = ivec3(pos.x, pos.y * SH_SIZE + i, 0);
|
|
for (uint j = 0; j < params.history_size; j++) {
|
|
dst_pos.z = int(j);
|
|
imageStore(lightprobe_history_scroll_texture, dst_pos, ivalue);
|
|
}
|
|
|
|
ivalue *= int(params.history_size); //average needs to have all history added up
|
|
imageStore(lightprobe_average_scroll_texture, dst_pos.xy, ivalue);
|
|
}
|
|
|
|
} else {
|
|
//scroll at the edge of the highest cascade, just copy what is there,
|
|
//since its the closest we have anyway
|
|
|
|
for (uint j = 0; j < params.history_size; j++) {
|
|
ivec2 tex_pos;
|
|
tex_pos = probe_cell.xy;
|
|
tex_pos.x += probe_cell.z * int(params.probe_axis_size);
|
|
|
|
for (int i = 0; i < SH_SIZE; i++) {
|
|
// copy from history texture
|
|
ivec3 src_pos = ivec3(tex_pos.x, tex_pos.y * SH_SIZE + i, int(j));
|
|
ivec3 dst_pos = ivec3(pos.x, pos.y * SH_SIZE + i, int(j));
|
|
ivec4 value = imageLoad(lightprobe_history_texture, dst_pos);
|
|
imageStore(lightprobe_history_scroll_texture, dst_pos, value);
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < SH_SIZE; i++) {
|
|
// copy from average texture
|
|
ivec2 spos = ivec2(pos.x, pos.y * SH_SIZE + i);
|
|
ivec4 average = imageLoad(lightprobe_average_texture, spos);
|
|
imageStore(lightprobe_average_scroll_texture, spos, average);
|
|
}
|
|
}
|
|
|
|
#endif
|
|
|
|
#ifdef MODE_SCROLL_STORE
|
|
|
|
//do not update probe texture, as these will be updated later
|
|
|
|
for (uint j = 0; j < params.history_size; j++) {
|
|
for (int i = 0; i < SH_SIZE; i++) {
|
|
// copy from history texture
|
|
ivec3 spos = ivec3(pos.x, pos.y * SH_SIZE + i, int(j));
|
|
ivec4 value = imageLoad(lightprobe_history_scroll_texture, spos);
|
|
imageStore(lightprobe_history_texture, spos, value);
|
|
}
|
|
}
|
|
|
|
for (int i = 0; i < SH_SIZE; i++) {
|
|
// copy from average texture
|
|
ivec2 spos = ivec2(pos.x, pos.y * SH_SIZE + i);
|
|
ivec4 average = imageLoad(lightprobe_average_scroll_texture, spos);
|
|
imageStore(lightprobe_average_texture, spos, average);
|
|
}
|
|
|
|
#endif
|
|
}
|