diff options
Diffstat (limited to 'game/client/world/voxel_atlas.cc')
| -rw-r--r-- | game/client/world/voxel_atlas.cc | 185 |
1 files changed, 0 insertions, 185 deletions
diff --git a/game/client/world/voxel_atlas.cc b/game/client/world/voxel_atlas.cc deleted file mode 100644 index 67832d3..0000000 --- a/game/client/world/voxel_atlas.cc +++ /dev/null @@ -1,185 +0,0 @@ -#include "client/pch.hh"
-
-#include "client/world/voxel_atlas.hh"
-
-#include "core/math/constexpr.hh"
-#include "core/math/crc64.hh"
-
-#include "core/resource/image.hh"
-#include "core/resource/resource.hh"
-
-struct AtlasPlane final {
- std::unordered_map<std::size_t, std::size_t> lookup;
- std::vector<world::AtlasStrip> strips;
- std::size_t layer_count_max;
- std::size_t layer_count;
- std::size_t plane_id;
- GLuint gl_texture;
-};
-
-static int atlas_width;
-static int atlas_height;
-static std::size_t atlas_count;
-static std::vector<AtlasPlane> planes;
-
-// Certain animated and varied voxels just double their
-// textures (see the "default" texture part in VoxelInfoBuilder::build)
-// so there could either be six UNIQUE atlas strips or only one
-// https://crypto.stackexchange.com/questions/55162/best-way-to-hash-two-values-into-one
-static std::size_t vector_hash(const std::vector<std::string>& strings)
-{
- std::size_t source = 0;
- for(const std::string& str : strings)
- source += math::crc64(str);
- return math::crc64(&source, sizeof(source));
-}
-
-static void plane_setup(AtlasPlane& plane)
-{
- glGenTextures(1, &plane.gl_texture);
- glBindTexture(GL_TEXTURE_2D_ARRAY, plane.gl_texture);
- glTexImage3D(GL_TEXTURE_2D_ARRAY, 0, GL_RGBA8, atlas_width, atlas_height, plane.layer_count_max, 0, GL_RED, GL_UNSIGNED_BYTE, nullptr);
- glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_LINEAR);
- glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
- glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_S, GL_REPEAT);
- glTexParameteri(GL_TEXTURE_2D_ARRAY, GL_TEXTURE_WRAP_T, GL_REPEAT);
-}
-
-static world::AtlasStrip* plane_lookup(AtlasPlane& plane, std::size_t hash_value)
-{
- const auto it = plane.lookup.find(hash_value);
-
- if(it != plane.lookup.cend()) {
- return &plane.strips[it->second];
- }
-
- return nullptr;
-}
-
-static world::AtlasStrip* plane_new_strip(AtlasPlane& plane, const std::vector<std::string>& paths, std::size_t hash_value)
-{
- world::AtlasStrip strip = {};
- strip.offset = plane.layer_count;
- strip.plane = plane.plane_id;
-
- glBindTexture(GL_TEXTURE_2D_ARRAY, plane.gl_texture);
-
- for(std::size_t i = 0; i < paths.size(); ++i) {
- if(auto image = resource::load<Image>(paths[i].c_str(), IMAGE_LOAD_FLIP)) {
- if((image->size.x != atlas_width) || (image->size.y != atlas_height)) {
- spdlog::warn("atlas: {}: size mismatch", paths[i]);
- continue;
- }
-
- const std::size_t offset = strip.offset + i;
- glTexSubImage3D(GL_TEXTURE_2D_ARRAY, 0, 0, 0, offset, image->size.x, image->size.y, 1, GL_RGBA, GL_UNSIGNED_BYTE,
- image->pixels);
- }
- }
-
- plane.layer_count += paths.size();
-
- const std::size_t index = plane.strips.size();
- plane.lookup.emplace(hash_value, index);
- plane.strips.push_back(std::move(strip));
- return &plane.strips[index];
-}
-
-void world::voxel_atlas::create(int width, int height, std::size_t count)
-{
- GLint max_plane_layers;
-
- atlas_width = 1 << math::log2(width);
- atlas_height = 1 << math::log2(height);
-
- // Clipping this at OpenGL 4.5 limit of 2048 is important due to
- // how voxel quad meshes are packed in memory: each texture index is
- // confined in 11 bits so having bigger atlas planes makes no sense;
- glGetIntegerv(GL_MAX_ARRAY_TEXTURE_LAYERS, &max_plane_layers);
- max_plane_layers = glm::clamp(max_plane_layers, 256, 2048);
-
- for(long i = count; i > 0L; i -= max_plane_layers) {
- AtlasPlane plane = {};
- plane.plane_id = planes.size();
- plane.layer_count_max = glm::min<std::size_t>(max_plane_layers, i);
- plane.layer_count = 0;
-
- const std::size_t save_id = plane.plane_id;
- planes.push_back(std::move(plane));
- plane_setup(planes[save_id]);
- }
-
- spdlog::debug("voxel_atlas: count={}", count);
- spdlog::debug("voxel_atlas: atlas_size=[{}x{}]", atlas_width, atlas_height);
- spdlog::debug("voxel_atlas: max_plane_layers={}", max_plane_layers);
-}
-
-void world::voxel_atlas::destroy(void)
-{
- for(const AtlasPlane& plane : planes)
- glDeleteTextures(1, &plane.gl_texture);
- atlas_width = 0;
- atlas_height = 0;
- planes.clear();
-}
-
-std::size_t world::voxel_atlas::plane_count(void)
-{
- return planes.size();
-}
-
-GLuint world::voxel_atlas::plane_texture(std::size_t plane_id)
-{
- if(plane_id < planes.size()) {
- return planes[plane_id].gl_texture;
- }
- else {
- return 0;
- }
-}
-
-void world::voxel_atlas::generate_mipmaps(void)
-{
- for(const AtlasPlane& plane : planes) {
- glBindTexture(GL_TEXTURE_2D_ARRAY, plane.gl_texture);
- glGenerateMipmap(GL_TEXTURE_2D_ARRAY);
- }
-}
-
-world::AtlasStrip* world::voxel_atlas::find_or_load(const std::vector<std::string>& paths)
-{
- const std::size_t hash_value = vector_hash(paths);
-
- for(AtlasPlane& plane : planes) {
- if(AtlasStrip* strip = plane_lookup(plane, hash_value)) {
- return strip;
- }
-
- continue;
- }
-
- for(AtlasPlane& plane : planes) {
- if((plane.layer_count + paths.size()) <= plane.layer_count_max) {
- return plane_new_strip(plane, paths, hash_value);
- }
-
- continue;
- }
-
- return nullptr;
-}
-
-world::AtlasStrip* world::voxel_atlas::find(const std::vector<std::string>& paths)
-{
- const std::size_t hash_value = vector_hash(paths);
-
- for(AtlasPlane& plane : planes) {
- if(AtlasStrip* strip = plane_lookup(plane, hash_value)) {
- return strip;
- }
-
- continue;
- }
-
- return nullptr;
-}
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