#pragma once #include "object.h" #include "bindable.h" #include "buffer.h" #include #include #define UBS_PAD(x) uint8_t PAD[x] // 12-byte vec3 for structs that must match an exact binary layout (UBOs, vertex data). // Stays packed regardless of GLM_FORCE_DEFAULT_ALIGNED_GENTYPES. // Guard prevents redefinition when stdafx.h also defines it. #ifndef PACKED_VEC3_DEFINED #define PACKED_VEC3_DEFINED using packed_vec3 = glm::vec<3, float, glm::packed_highp>; #endif namespace gl { class ubo : public buffer { int index; public: ubo(size_t size, int index, GLenum hint = GL_DYNAMIC_DRAW); void bind_uniform(); void update(const uint8_t *data, int offset, GLsizeiptr size); template void update(const T &data, size_t offset = 0) { update(reinterpret_cast(&data), static_cast(offset), sizeof(data)); } }; // layout std140 // structs must match with GLSL // ordered to minimize padding #pragma pack(push, 1) const size_t MAX_TEXTURES = 8; const size_t ENVMAP_SIZE = 1024; const size_t MAX_CASCADES = 3; const size_t HELPER_TEXTURES = 4; const size_t SHADOW_TEX = MAX_TEXTURES + 0; const size_t ENV_TEX = MAX_TEXTURES + 1; const size_t HEADLIGHT_TEX = MAX_TEXTURES + 2; // environment map prefiltered with the GGX lobe, see envmapping.glsl const size_t ENV_GGX_TEX = MAX_TEXTURES + 3; // the prefiltered map: size of its first level and the number of levels. level k holds the reflection of a surface of // perceptual roughness ENVMAP_GGX_ROUGHNESS_MIN + (1 - ENVMAP_GGX_ROUGHNESS_MIN) * k / (ENVMAP_GGX_LEVELS - 1); smoother // surfaces read the mipmaps of the plain map, which differ little from the lobe there const size_t ENVMAP_GGX_SIZE = 256; const size_t ENVMAP_GGX_LEVELS = 7; const float ENVMAP_GGX_ROUGHNESS_MIN = 0.2f; const size_t ENVMAP_GGX_GROUP_SIZE = 8; // sky-view table of the atmosphere (sky_atmosphere.frag). past the units the texture cache keeps track of, bound directly const size_t SKY_VIEW_TEX = MAX_TEXTURES + HELPER_TEXTURES + 0; // cube shadow maps of the lamps (cube map array, depth compared; opengl46_local_shadows). bound directly, like the one above const size_t LOCAL_SHADOW_TEX = MAX_TEXTURES + HELPER_TEXTURES + 1; // the same for the lamps of scenery models (a texture of its own: the maps have another size) const size_t LOCAL_SHADOW_LAMPS_TEX = MAX_TEXTURES + HELPER_TEXTURES + 2; // shadow maps of the headlights of vehicles (2d array, depth compared; opengl46_local_shadows), and how many of them there may be const size_t HEADLIGHT_SHADOW_TEX = MAX_TEXTURES + HELPER_TEXTURES + 3; const size_t MAX_HEADLIGHT_SHADOWS = 4; // weather (opengl46_weather): the fog of the main view (3d, apply_fog.glsl) and the shadows the clouds cast (2d), read by the // shading. bound directly, like the ones above const size_t FOG_VOLUME_TEX = MAX_TEXTURES + HELPER_TEXTURES + 4; const size_t CLOUD_SHADOW_TEX = MAX_TEXTURES + HELPER_TEXTURES + 5; // the clouds drawn into the sky, and the noise the clouds and the fog are made of; bound by the passes which read them const size_t CLOUD_TEX = MAX_TEXTURES + HELPER_TEXTURES + 6; const size_t CLOUD_SHAPE_TEX = MAX_TEXTURES + HELPER_TEXTURES + 7; const size_t CLOUD_DETAIL_TEX = MAX_TEXTURES + HELPER_TEXTURES + 8; const size_t CLOUD_COVERAGE_TEX = MAX_TEXTURES + HELPER_TEXTURES + 9; const size_t CLOUD_HISTORY_TEX = MAX_TEXTURES + HELPER_TEXTURES + 10; // the depth of the opaque scene of the main view drawn before its colour, resolved, for the contact shadows (light_common.glsl). // bound directly, like the ones above const size_t SCENE_DEPTH_TEX = MAX_TEXTURES + HELPER_TEXTURES + 11; struct scene_ubs { glm::mat4 projection; glm::mat4 inv_view; glm::mat4 lightview[MAX_CASCADES]; packed_vec3 cascade_end; float time; glm::vec4 rain_params; glm::vec4 wiper_pos; glm::vec4 wiper_timer_out; glm::vec4 wiper_timer_return; // view space of the pass to the space of the shadow map of a set of headlights (HEADLIGHTS lights with headlight_weights.w // above 0 read the map w - 1): x, y 0..1 across the map, z / w the depth of the map, w the distance along the axis of the // projector. and x: size of a texel of the map one metre from the projector, y: radius of the filter in texels glm::mat4 headlight_shadow[MAX_HEADLIGHT_SHADOWS]; glm::vec4 headlight_shadow_params[MAX_HEADLIGHT_SHADOWS]; // contact shadows, read from SCENE_DEPTH_TEX; set only for the colour pass of the main view, zero elsewhere. // x: length of the rays towards the lights, metres (0: off), y: distance from the camera at which they end, z: steps // of the ray towards the sun, w: steps of the rays towards lamps and headlights glm::vec4 contact_shadow_params; // x: how many lamps and headlights a pixel traces the rays to (0: only the sun), yzw unused glm::vec4 contact_shadow_lamps; // x: 1 when the cascades of the sun shadows are fitted to the depth of the view (gfx.shadow.sdsm, opengl46_shadow_fit): // a point outside the map of its cascade goes to the next cascade whose map holds it. yzw unused glm::vec4 shadow_fit; }; static_assert(sizeof(scene_ubs) == 448 + 80 * MAX_HEADLIGHT_SHADOWS, "bad size of ubs"); const size_t MAX_PARAMS = 3; struct model_ubs { glm::mat4 modelview; glm::mat3x4 modelviewnormal; glm::vec4 param[MAX_PARAMS]; glm::mat4 future; float opacity; float emission; float fog_density; float alpha_mult; float shadow_tone; UBS_PAD(12); void set_modelview(const glm::mat4 &mv) { modelview = mv; // normal matrix = transpose(inverse(modelview)). The modelview is // always affine, so its 3x3 normal matrix depends only on the // upper-left 3x3 block; inverting that mat3 directly is markedly // cheaper than a full mat4 inverse and yields an identical result // (for affine M, mat3(inverse(M)) == inverse(mat3(M))). modelviewnormal = glm::mat3x4(glm::transpose(glm::inverse(glm::mat3(mv)))); } }; static_assert(sizeof(model_ubs) == 208 + 16 * MAX_PARAMS, "bad size of ubs"); // layout std430 (shader storage buffers) // structs must match with GLSL, offsets checked below // binding points of the shader storage blocks: layout(std430, binding = ...) in glsl_common const GLuint LIGHT_SSBO_BINDING = 0; // one light source, element of light_ssbo.lights[] (GLSL: light_s) struct light_element { enum type_e { SPOT = 0, POINT, DIR, HEADLIGHTS }; packed_vec3 pos; type_e type; packed_vec3 dir; float in_cutoff; packed_vec3 color; float out_cutoff; float linear; float quadratic; float intensity; float ambient; // HEADLIGHTS: view space to the space of the beam texture, and the weights of its channels; w: 1 + the shadow map of the // headlights (scene_ubs::headlight_shadow), 0 when they have none. // SPOT and POINT (lamps): view space to the space of the cube shadow map of the lamp (origin at the lamp), and // x: layer of the cube map array the map is in, below 0 when the lamp has no shadows; y: near plane of the map; // z: size of a texel of the map one metre from the lamp; w: radius of the filter, in texels. the map is in the array of // the scenery lamps (LOCAL_SHADOW_LAMPS_TEX) when linear is 1, in the one of the cab lamp (LOCAL_SHADOW_TEX) otherwise glm::mat4 headlight_projection; glm::vec4 headlight_weights; }; // std430 array stride of a struct is its size rounded up to its alignment (16, from mat4/vec4) static_assert(sizeof(light_element) == 144, "bad size of light_element"); static_assert(sizeof(light_element) % 16 == 0, "light_element must be a whole std430 array stride"); static_assert(offsetof(light_element, pos) == 0, "bad layout of light_element"); static_assert(offsetof(light_element, type) == 12, "bad layout of light_element"); static_assert(offsetof(light_element, dir) == 16, "bad layout of light_element"); static_assert(offsetof(light_element, in_cutoff) == 28, "bad layout of light_element"); static_assert(offsetof(light_element, color) == 32, "bad layout of light_element"); static_assert(offsetof(light_element, out_cutoff) == 44, "bad layout of light_element"); static_assert(offsetof(light_element, linear) == 48, "bad layout of light_element"); static_assert(offsetof(light_element, quadratic) == 52, "bad layout of light_element"); static_assert(offsetof(light_element, intensity) == 56, "bad layout of light_element"); static_assert(offsetof(light_element, ambient) == 60, "bad layout of light_element"); static_assert(offsetof(light_element, headlight_projection) == 64, "bad layout of light_element"); static_assert(offsetof(light_element, headlight_weights) == 128, "bad layout of light_element"); // capacity of light_data.lights; slot 0 is the sun. a buffer size, not a limit of the shaders: they take the // number of lights from the header const size_t MAX_LIGHTS = 1024; // contents of light_ssbo: global lighting header followed by the light array struct light_data { packed_vec3 ambient; // number of lights stored in lights[] (the sun included): what the light clusters are culled from uint32_t lights_total; packed_vec3 fog_color; // number of lights (the sun included) the shading loop over lights[] goes through when the lights are not clustered uint32_t lights_count; // 1 if the shading takes the lights of a fragment from the list of its cluster (lights_count is not used then), 0 if not. // set per pass: the cluster grid exists only for the color pass of a perspective view uint32_t lights_clustered; // scale of the directional part of the sky ambient light (sky_ssbo): the factor the ambient light of the object // is scaled with (tunnels), 0 where the ambient light is not the sky's (model previews) float sky_ambient_factor; // 1 if the shading reads rough reflections from the prefiltered environment map, 0 if from the mipmaps of the plain one uint32_t env_ggx; // lights[] begins at a multiple of 16 bytes uint32_t padding; light_element lights[MAX_LIGHTS]; }; static_assert(offsetof(light_data, ambient) == 0, "bad layout of light_data"); static_assert(offsetof(light_data, lights_total) == 12, "bad layout of light_data"); static_assert(offsetof(light_data, fog_color) == 16, "bad layout of light_data"); static_assert(offsetof(light_data, lights_count) == 28, "bad layout of light_data"); static_assert(offsetof(light_data, lights_clustered) == 32, "bad layout of light_data"); static_assert(offsetof(light_data, sky_ambient_factor) == 36, "bad layout of light_data"); static_assert(offsetof(light_data, env_ggx) == 40, "bad layout of light_data"); static_assert(offsetof(light_data, lights) == 48, "bad layout of light_data"); static_assert(sizeof(light_data) == 48 + sizeof(light_element) * MAX_LIGHTS, "bad size of light_data"); // light clusters (see gl/cluster_grid.h): the view frustum is cut into CLUSTER_GRID_X x CLUSTER_GRID_Y screen // tiles and CLUSTER_GRID_Z depth slices, spaced exponentially between the near and far plane of the pass. // cluster index = x + CLUSTER_GRID_X * (y + CLUSTER_GRID_Y * z), with x and y counted from the lower left corner const GLuint CLUSTER_GRID_X = 16; const GLuint CLUSTER_GRID_Y = 9; const GLuint CLUSTER_GRID_Z = 24; const GLuint CLUSTER_COUNT = CLUSTER_GRID_X * CLUSTER_GRID_Y * CLUSTER_GRID_Z; // capacity of the light list of a single cluster const GLuint MAX_LIGHTS_PER_CLUSTER = 64; // work group size of cluster_build.comp and cluster_cull.comp, which handle one cluster per invocation const GLuint CLUSTER_BUILD_GROUP_SIZE = 64; const GLuint CLUSTER_CULL_GROUP_SIZE = 64; // binding points of the cluster buffers: layout(binding = ...) in glsl_common. // the uniform block numbers go together with scene (0), model (1) and instance (3) blocks const GLuint CLUSTER_UBO_BINDING = 2; const GLuint CLUSTER_AABB_SSBO_BINDING = 1; const GLuint CLUSTER_RANGE_SSBO_BINDING = 2; const GLuint CLUSTER_INDEX_SSBO_BINDING = 3; const GLuint CLUSTER_COUNTER_SSBO_BINDING = 4; // layout std140: grid parameters for the pass it was built for (GLSL: cluster_ubo) struct cluster_ubs { glm::mat4 projection; float znear; float zfar; // depth slice of a point with clip space w: floor(log(w) * slice_scale + slice_bias), znear..zfar covers all slices float slice_scale; float slice_bias; // size of the render target the tiles are laid over, in pixels float viewport_width; float viewport_height; // 0 if there is no grid for the pass (orthographic projection) uint32_t valid; UBS_PAD(4); }; static_assert(sizeof(cluster_ubs) == 96, "bad size of cluster_ubs"); static_assert(offsetof(cluster_ubs, projection) == 0, "bad layout of cluster_ubs"); static_assert(offsetof(cluster_ubs, znear) == 64, "bad layout of cluster_ubs"); static_assert(offsetof(cluster_ubs, zfar) == 68, "bad layout of cluster_ubs"); static_assert(offsetof(cluster_ubs, slice_scale) == 72, "bad layout of cluster_ubs"); static_assert(offsetof(cluster_ubs, slice_bias) == 76, "bad layout of cluster_ubs"); static_assert(offsetof(cluster_ubs, viewport_width) == 80, "bad layout of cluster_ubs"); static_assert(offsetof(cluster_ubs, viewport_height) == 84, "bad layout of cluster_ubs"); static_assert(offsetof(cluster_ubs, valid) == 88, "bad layout of cluster_ubs"); // layout std430: bounding box of a cluster in view space, element of cluster_aabb_ssbo (GLSL: cluster_aabb_s), w unused struct cluster_aabb { glm::vec4 lower; glm::vec4 upper; }; static_assert(sizeof(cluster_aabb) == 32, "bad size of cluster_aabb"); static_assert(offsetof(cluster_aabb, lower) == 0, "bad layout of cluster_aabb"); static_assert(offsetof(cluster_aabb, upper) == 16, "bad layout of cluster_aabb"); // layout std430: lights of a cluster, element of cluster_range_ssbo (GLSL: cluster_range_s). the lights are // light_data.lights indices stored in the cluster_index_ssbo list from offset on struct cluster_range { uint32_t offset; uint32_t count; }; static_assert(sizeof(cluster_range) == 8, "bad size of cluster_range"); static_assert(offsetof(cluster_range, offset) == 0, "bad layout of cluster_range"); static_assert(offsetof(cluster_range, count) == 4, "bad layout of cluster_range"); // layout std430: cluster_counter_ssbo, zeroed before every culling pass. index_count is the allocator of the shared // index list, overflow_count the number of (cluster, light) pairs dropped because the cluster already held // MAX_LIGHTS_PER_CLUSTER lights struct cluster_counters { uint32_t index_count; uint32_t overflow_count; }; static_assert(sizeof(cluster_counters) == 8, "bad size of cluster_counters"); static_assert(offsetof(cluster_counters, index_count) == 0, "bad layout of cluster_counters"); static_assert(offsetof(cluster_counters, overflow_count) == 4, "bad layout of cluster_counters"); // binding points of the sky, exposure and atmosphere buffers: layout(binding = ...) in glsl_common const GLuint SKY_SSBO_BINDING = 5; const GLuint EXPOSURE_SSBO_BINDING = 6; const GLuint ATMOSPHERE_RESULT_SSBO_BINDING = 7; const GLuint ATMOSPHERE_UBO_BINDING = 4; // binding point of the per-instance modelview matrices of instanced draws (glsl: instance_ssbo, mat4 per instance). // element 0 is identity, the matrix of every draw which isn't instanced const GLuint INSTANCE_SSBO_BINDING = 8; // number of coefficients of the spherical harmonics of order 2 (bands 0..2) const size_t SKY_SH_COEFFICIENTS = 9; // layout std430: directional part of the sky ambient light (GLSL: sky_ssbo). the coefficients of the real spherical // harmonics of the light a surface facing a world space direction gets, in units of light_data.ambient, without the // constant band (that one is light_data.ambient itself); rgb used, w is padding struct sky_data { glm::vec4 ambient_sh[SKY_SH_COEFFICIENTS]; }; static_assert(sizeof(sky_data) == 144, "bad size of sky_data"); // layout std430: luminance histogram of the image and the exposure worked out from it (GLSL: exposure_ssbo) const GLuint EXPOSURE_HISTOGRAM_BINS = 256; const GLuint EXPOSURE_HISTOGRAM_GROUP_SIZE = 16; struct exposure_data { uint32_t histogram[EXPOSURE_HISTOGRAM_BINS]; // luminance the exposure is adapted to, the time-smoothed average of the image float adapted_luminance; // multiplier the tonemapping applies to the image float exposure; // average luminance of the last image float average_luminance; // 0 until the first average was taken, the adaptation starts from it uint32_t valid; }; static_assert(sizeof(exposure_data) == 4 * EXPOSURE_HISTOGRAM_BINS + 16, "bad size of exposure_data"); static_assert(offsetof(exposure_data, adapted_luminance) == 4 * EXPOSURE_HISTOGRAM_BINS, "bad layout of exposure_data"); // sizes of the look-up tables of the atmosphere (Hillaire 2020) const GLuint ATMOSPHERE_TRANSMITTANCE_WIDTH = 256; const GLuint ATMOSPHERE_TRANSMITTANCE_HEIGHT = 64; const GLuint ATMOSPHERE_MULTISCATTERING_SIZE = 32; const GLuint ATMOSPHERE_SKYVIEW_WIDTH = 192; const GLuint ATMOSPHERE_SKYVIEW_HEIGHT = 108; // work group of atmosphere_ambient.comp, which projects the sky on the spherical harmonics in one group const GLuint ATMOSPHERE_AMBIENT_GROUP_SIZE = 256; // binding points of the look-up tables in the compute passes (images and samplers) const GLuint ATMOSPHERE_TRANSMITTANCE_UNIT = 0; const GLuint ATMOSPHERE_MULTISCATTERING_UNIT = 1; const GLuint ATMOSPHERE_SKYVIEW_UNIT = 2; // layout std140: parameters of the atmosphere (GLSL: atmosphere_ubo). distances in kilometres, coefficients per kilometre struct atmosphere_ubs { // rgb: rayleigh scattering, w: rayleigh scale height glm::vec4 rayleigh; // x: mie scattering, y: mie extinction, z: mie scale height, w: mie phase asymmetry glm::vec4 mie; // rgb: ozone absorption, w: altitude of the middle of the ozone layer glm::vec4 ozone; // rgb: albedo of the ground, w: half width of the ozone layer glm::vec4 ground; // world space direction towards the sun (y up), w unused glm::vec4 sun_direction; float bottom_radius; float top_radius; // distance of the observer from the centre of the planet float observer_radius; float padding; }; static_assert(sizeof(atmosphere_ubs) == 96, "bad size of atmosphere_ubs"); // layout std430: what atmosphere_ambient.comp works out for the cpu (GLSL: atmosphere_result_ssbo). radiance with // the sun of illuminance 1 struct atmosphere_result { // radiance arriving at the observer from every direction, ground included, as real spherical harmonics (world, y up) glm::vec4 radiance_sh[SKY_SH_COEFFICIENTS]; // transmittance of the atmosphere towards the sun at the observer glm::vec4 sun_transmittance; // average radiance of the sky just above the horizon glm::vec4 horizon; // average radiance of the upper hemisphere glm::vec4 average; // transmittance of the atmosphere straight up from the observer: the colour of the sun high in the sky glm::vec4 zenith_transmittance; }; static_assert(sizeof(atmosphere_result) == 16 * (SKY_SH_COEFFICIENTS + 4), "bad size of atmosphere_result"); // weather of the opengl 4.6 renderer (opengl46_weather, weather_common.glsl): fog, clouds, their shadows const GLuint WEATHER_UBO_BINDING = 5; // layers of clouds drawn, see weather_conditions::max_cloud_layers const size_t MAX_CLOUD_LAYERS = 4; // colours of the fog towards the horizon, by the angle from the azimuth of the sun (0-180 degrees) const size_t FOG_HORIZON_SAMPLES = 32; // work groups of the weather passes: 8x8 for the images, 8x8x1 for the fog volume const GLuint WEATHER_GROUP_SIZE = 8; // the slices of the fog volume are spaced exponentially in the view depth plus this many metres: fewer of them go to the first // metres in front of the camera, more to the distance, where thick slices draw the shafts of light in steps const float FOG_VOLUME_BIAS = 10.0f; // layout std140: one layer of clouds (GLSL: cloud_layer_s), see weather_common.glsl struct cloud_layer_ubs { glm::vec4 heights; glm::vec4 shape; glm::vec4 profile; glm::vec4 motion; glm::vec4 extra; }; static_assert(sizeof(cloud_layer_ubs) == 80, "bad size of cloud_layer_ubs"); // layout std140: the weather for the shading and the weather passes (GLSL: weather_ubo), see weather_common.glsl struct weather_ubs { glm::vec4 fog_haze; glm::vec4 fog_ground; glm::vec4 fog_noise; glm::vec4 fog_light; glm::vec4 fog_volume_params; glm::vec4 fog_volume_target; glm::vec4 weather_camera; glm::vec4 weather_sun_direction; glm::vec4 weather_sun_color; glm::vec4 weather_ambient; glm::vec4 cloud_shadow_params; glm::vec4 cloud_wind; cloud_layer_ubs cloud_layers[MAX_CLOUD_LAYERS]; // filled on the gpu (fog_horizon.comp) while the atmosphere is used, by the cpu otherwise glm::vec4 fog_horizon[FOG_HORIZON_SAMPLES]; }; static_assert(offsetof(weather_ubs, cloud_layers) == 192, "bad layout of weather_ubs"); static_assert(offsetof(weather_ubs, fog_horizon) == 192 + 80 * MAX_CLOUD_LAYERS, "bad layout of weather_ubs"); static_assert(sizeof(weather_ubs) == 192 + 80 * MAX_CLOUD_LAYERS + 16 * FOG_HORIZON_SAMPLES, "bad size of weather_ubs"); // the weather buffer is written by fog_horizon.comp as a storage block bound here for the pass. the point is one of the // instance culling, which binds its buffers before every use const GLuint WEATHER_SCRATCH_SSBO_BINDING = 9; // culling of model instances in compute passes (instance_cull.comp, instance_cull_offsets.comp). binding points of // the shader storage blocks, apart from the ones bound for the shading so the passes don't disturb them const GLuint INSTANCE_RECORD_SSBO_BINDING = 9; // scene::basic_cell::instance_record of the queued buckets const GLuint INSTANCE_JOB_SSBO_BINDING = 10; // instance_cull_job, one per queued bucket (or track with sleepers) const GLuint INSTANCE_GROUP_SSBO_BINDING = 11; // instance_cull_group, one per model and skins const GLuint INSTANCE_LOD_SSBO_BINDING = 12; // sorted lod bounds (squared distances) of the groups const GLuint INSTANCE_COUNTER_SSBO_BINDING = 13; // header, then count[entries], cursor[entries] and first[entries] const GLuint INSTANCE_OUTPUT_SSBO_BINDING = 14; // modelview matrices of the instances which passed, by entry const GLuint INSTANCE_COMMAND_SSBO_BINDING = 15; // indirect draw commands of the entries (instance_cull_commands.comp) // the model blocks of the draws of a multi draw of the instances drawn from the gpu culling, one gl::model_ubs per draw // (std430, the same layout), read by gl_DrawID in programs built with MODEL_DRAWS. the point is the one of the jobs of the // instance culling, which binds its buffers before every use; the draws bind theirs before every multi draw const GLuint MODEL_DRAW_SSBO_BINDING = 10; const GLuint INSTANCE_CULL_GROUP_SIZE = 64; const GLuint INSTANCE_OFFSETS_GROUP_SIZE = 1024; const GLuint INSTANCE_COMMAND_GROUP_SIZE = 64; // uints of the header of the counter buffer: frame number, survivors of the tests but the occlusion one in total, // entries, instances left out as hidden behind the depth already drawn (occlusion test), instances drawn first in two // phases (seen in the previous frame), unused. // an entry is a lod band of a group: survivors of group g in band b are counted at entry entryfirst(g) + b const GLuint INSTANCE_COUNTER_HEADER = 8; // work group of the passes which make the depth pyramid of the occlusion test (hiz_build.comp), 8x8 const GLuint HIZ_GROUP_SIZE = 8; // the cascades of the sun shadows fitted to the depth of the main view (opengl46_shadow_fit, shadow_fit_*.comp): work group // of its passes, 16x16 pixels, and the binding point of its buffer. the point is one of the instance culling, which binds // its buffers before every use; the fit binds its own before its passes const GLuint SHADOW_FIT_GROUP_SIZE = 16; const GLuint SHADOW_FIT_SSBO_BINDING = 9; // the particles of the gpu (opengl46_gpu_particles, particles_*.comp, particle_common.glsl): work group of their passes and the // binding points of their buffers. the points are ones of the instance culling, which binds its buffers before every use; the // particles bind their own before their passes. the draws read the particles as attributes of instances, not from storage const GLuint PARTICLE_GROUP_SIZE = 64; const GLuint PARTICLE_SSBO_BINDING = 9; // the smoke particles const GLuint PARTICLE_SOURCE_SSBO_BINDING = 10; // their sources, as the last update of the simulation left them const GLuint PARTICLE_OWNER_SSBO_BINDING = 11; // the source of every place of the particles const GLuint PARTICLE_OUTPUT_SSBO_BINDING = 12; // what the draw reads, a particle_draw per particle drawn const GLuint PARTICLE_COMMAND_SSBO_BINDING = 13; // the indirect draw command, whose instances the passes count // layout std430: GLSL smoke_particle_s struct particle_smoke { glm::vec4 position; glm::vec4 velocity; glm::vec4 state; }; static_assert(sizeof(particle_smoke) == 48, "bad size of particle_smoke"); // layout std430: GLSL smoke_source_s struct particle_smoke_source { glm::uvec4 pool; glm::vec4 location; glm::vec4 previous; glm::vec4 launch; glm::vec4 initial; glm::vec4 sizechange; glm::vec4 opacitychange; glm::vec4 motion; glm::vec4 settling; glm::vec4 color; glm::vec4 oldcolor; }; static_assert(sizeof(particle_smoke_source) == 176, "bad size of particle_smoke_source"); // layout std430: GLSL particle_draw_s, read by the draws as attributes of instances struct particle_draw { glm::vec4 place; glm::vec4 shape; glm::vec4 color; }; static_assert(sizeof(particle_draw) == 48, "bad size of particle_draw"); // layout std430: a bucket of a scene cell queued in the pass (GLSL: instance_cull_job) struct instance_cull_job { packed_vec3 origin; // origin of the records of the bucket, relative to the camera of the pass uint32_t first; // first record of the bucket in the record buffer packed_vec3 distanceorigin; // the same origin, relative to the camera the distance is measured from uint32_t count; // records of the bucket uint32_t group; uint32_t candidatestart; // records of the jobs before this one uint32_t flags; // instance_cull_job_flags uint32_t pad; }; enum instance_cull_job_flags : uint32_t { // the sleepers of a track (opengl46_renderer::Render_Sleepers()): the lod goes by the plain distance from the camera of // the pass, without the range and size tests of the model instances (the range of the whole track is tested on the cpu) INSTANCE_JOB_SLEEPERS = 1u }; static_assert(sizeof(instance_cull_job) == 48, "bad size of instance_cull_job"); // layout std430: instances of one model with one set of skins, the unit drawn together (GLSL: instance_cull_group) struct instance_cull_group { uint32_t lodfirst; // first bound in the lod buffer uint32_t lodcount; // bounds; the group has lodcount + 1 bands uint32_t entryfirst; // first entry of the counters uint32_t pad; }; static_assert(sizeof(instance_cull_group) == 16, "bad size of instance_cull_group"); // layout std430: an indirect draw of the submodel of a group in one of its lod bands. the first five fields are the // command of glDrawElementsIndirect (count, instance count, first index, base vertex, base instance), or with indexed 0 // the one of glDrawArraysIndirect (count, instance count, first vertex, base instance). the cpu fills in what it knows // of the geometry, instance_cull_commands.comp the instances, from the counts of the entry. the command buffer holds the // commands of a pass three times over (instances drawn first, all, drawn second), see opengl46_instance_cull struct instance_draw_command { uint32_t count; uint32_t instancecount; uint32_t first; uint32_t basevertex; // the base instance of an array draw uint32_t baseinstance; uint32_t entry; uint32_t indexed; uint32_t pad; }; static_assert(sizeof(instance_draw_command) == 32, "bad size of instance_draw_command"); // layout std430: what the passes of the cascades fitted to the depth of the view leave for the cpu (GLSL: shadow_fit_ssbo). // the cpu writes it before the passes: the number of the measurement, no pixels, the nearest distance infinite, the bounds // empty. the passes take the extremes with atomic operations on the bits: positive floats order as uints, and the bounds, // which can be negative, are stored in an order preserving form (shadow_fit_order() in shadow_fit_bounds.comp) struct shadow_fit_data { uint32_t measurement; // number given by the cpu, to find the camera and the light it was made with uint32_t samples; // pixels of the view which aren't the sky float depthmin; // nearest and farthest distance of those from the camera, metres float depthmax; float splits[4]; // distances the cascades go from and to (MAX_CASCADES + 1 of them), from the two above uint32_t counts[4]; // pixels taken into the bounds of each cascade (MAX_CASCADES of them) // per cascade the lowest x, y, z, unused, then the highest x, y, z, unused, of the pixels it takes, in metres in the // space of the light (its rotation only), relative to the camera uint32_t bounds[MAX_CASCADES * 8]; }; static_assert(MAX_CASCADES + 1 <= 4, "shadow_fit_data holds the splits of at most 3 cascades"); static_assert(offsetof(shadow_fit_data, splits) == 16, "bad layout of shadow_fit_data"); static_assert(offsetof(shadow_fit_data, counts) == 32, "bad layout of shadow_fit_data"); static_assert(offsetof(shadow_fit_data, bounds) == 48, "bad layout of shadow_fit_data"); static_assert(sizeof(shadow_fit_data) == 48 + 32 * MAX_CASCADES, "bad size of shadow_fit_data"); #pragma pack(pop) }