src/client/terrain_gfx.c

   1 #include <asprintf/asprintf.h>
   2 #include <linmath.h/linmath.h>
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include "client/client_config.h"
   6 #include "client/client_node.h"
   7 #include "client/client_terrain.h"
   8 #include "client/cube.h"
   9 #include "client/frustum.h"
  10 #include "client/gl_debug.h"
  11 #include "client/light.h"
  12 #include "client/shader.h"
  13 #include "client/terrain_gfx.h"
  14
  15 typedef struct {
  16         bool visible;
  17         bool transparent;
  18         ModelBatch *batch;
  19         ModelBatch *batch_transparent;
  20         TerrainChunk *chunk;
  21         v3s32 chunkp;
  22         TerrainChunk *nbrs[6];
  23         bool tried_nbrs[6];
  24         bool cull_edges;
  25 } ChunkRenderData;
  26
  27 static VertexLayout terrain_vertex_layout = {
  28         .attributes = (VertexAttribute []) {
  29                 {GL_FLOAT, 3, sizeof(v3f32)}, // position
  30                 {GL_FLOAT, 3, sizeof(v3f32)}, // normal
  31                 {GL_FLOAT, 2, sizeof(v2f32)}, // textureCoordinates
  32                 {GL_FLOAT, 1, sizeof(f32  )}, // textureIndex
  33                 {GL_FLOAT, 3, sizeof(v3f32)}, // color
  34         },
  35         .count = 5,
  36         .size = sizeof(TerrainVertex),
  37 };
  38
  39 static v3s32 face_dir[6] = {
  40         {+0, +0, -1},
  41         {+0, +0, +1},
  42         {-1, +0, +0},
  43         {+1, +0, +0},
  44         {+0, -1, +0},
  45         {+0, +1, +0},
  46 };
  47
  48 static v3f32 center_offset = {
  49         CHUNK_SIZE * 0.5f + 0.5f,
  50         CHUNK_SIZE * 0.5f + 0.5f,
  51         CHUNK_SIZE * 0.5f + 0.5f,
  52 };
  53
  54 static GLuint shader_prog;
  55 static GLint loc_VP;
  56
  57 static LightShader light_shader;
  58 static ModelShader model_shader;
  59
  60 static inline bool cull_face(NodeType self, NodeType nbr)
  61 {
  62         switch (client_node_definitions[self].visibility) {
  63                 case VISIBILITY_CLIP:
  64                         return false;
  65
  66                 case VISIBILITY_BLEND:
  67                         return self == nbr;
  68
  69                 case VISIBILITY_SOLID:
  70                         return nbr == NODE_UNLOADED
  71                                 || client_node_definitions[nbr].visibility == VISIBILITY_SOLID;
  72
  73                 default: // impossible
  74                         break;
  75         }
  76
  77         // impossible
  78         return false;
  79 }
  80
  81 static inline void render_node(ChunkRenderData *data, v3s32 offset)
  82 {
  83         NodeArgsRender args;
  84
  85         args.node = &data->chunk->data[offset.x][offset.y][offset.z];
  86
  87         ClientNodeDefinition *def = &client_node_definitions[args.node->type];
  88         if (def->visibility == VISIBILITY_NONE)
  89                 return;
  90
  91         v3f32 vertex_offset = v3f32_sub(v3s32_to_f32(offset), center_offset);
  92         if (def->render)
  93                 args.pos = v3s32_add(offset, data->chunkp);
  94
  95         for (args.f = 0; args.f < 6; args.f++) {
  96                 v3s32 nbr_offset = v3s32_add(offset, face_dir[args.f]);
  97
  98                 TerrainChunk *nbr_chunk;
  99
 100                 if (nbr_offset.z >= 0 && nbr_offset.z < CHUNK_SIZE &&
 101                         nbr_offset.x >= 0 && nbr_offset.x < CHUNK_SIZE &&
 102                         nbr_offset.y >= 0 && nbr_offset.y < CHUNK_SIZE) {
 103                         nbr_chunk = data->chunk;
 104                 } else if (!(nbr_chunk = data->nbrs[args.f]) && !data->tried_nbrs[args.f]) {
 105                         nbr_chunk = data->nbrs[args.f] = terrain_get_chunk(client_terrain,
 106                                 v3s32_add(data->chunk->pos, face_dir[args.f]), false);
 107                         data->tried_nbrs[args.f] = true;
 108                 }
 109
 110                 NodeType nbr_node = NODE_UNLOADED;
 111                 if (nbr_chunk)
 112                         nbr_node = nbr_chunk->data
 113                                 [(nbr_offset.x + CHUNK_SIZE) % CHUNK_SIZE]
 114                                 [(nbr_offset.y + CHUNK_SIZE) % CHUNK_SIZE]
 115                                 [(nbr_offset.z + CHUNK_SIZE) % CHUNK_SIZE].type;
 116
 117                 if (cull_face(args.node->type, nbr_node)) {
 118                         // exception to culling rules: don't cull solid edge nodes, unless cull_edges
 119                         if (data->cull_edges || nbr_chunk == data->chunk || def->visibility != VISIBILITY_SOLID)
 120                                 continue;
 121                 } else {
 122                         data->visible = true;
 123                 }
 124
 125                 ModelBatch *batch = data->batch;
 126
 127                 if (def->visibility == VISIBILITY_BLEND) {
 128                         data->transparent = true;
 129                         batch = data->batch_transparent;
 130                 }
 131
 132                 for (args.v = 0; args.v < 6; args.v++) {
 133                         args.vertex.cube = cube_vertices[args.f][args.v];
 134                         args.vertex.cube.position = v3f32_add(args.vertex.cube.position, vertex_offset);
 135                         args.vertex.color = (v3f32) {1.0f, 1.0f, 1.0f};
 136
 137                         if (def->render)
 138                                 def->render(&args);
 139
 140                         model_batch_add_vertex(batch, def->tiles.textures[args.f]->txo, &args.vertex);
 141                 }
 142         }
 143 }
 144
 145 static void animate_chunk_model(Model *model, f64 dtime)
 146 {
 147         if ((model->root->scale.x += dtime * 2.0f) > 1.0f) {
 148                 model->root->scale.x = 1.0f;
 149                 client_terrain_meshgen_task(model->extra);
 150         }
 151
 152         model->root->scale.z
 153                 = model->root->scale.y
 154                 = model->root->scale.x;
 155
 156         model_node_transform(model->root);
 157 }
 158
 159 static Model *create_chunk_model(TerrainChunk *chunk, bool animate)
 160 {
 161         ChunkRenderData data = {
 162                 .visible = false,
 163                 .transparent = false,
 164                 .batch = model_batch_create(&model_shader, &terrain_vertex_layout, offsetof(TerrainVertex, textureIndex)),
 165                 .batch_transparent = model_batch_create(&model_shader, &terrain_vertex_layout, offsetof(TerrainVertex, textureIndex)),
 166                 .chunk = chunk,
 167                 .chunkp = v3s32_scale(chunk->pos, CHUNK_SIZE),
 168                 .nbrs = {NULL},
 169                 .tried_nbrs = {false},
 170                 .cull_edges = !animate,
 171         };
 172
 173         CHUNK_ITERATE
 174                 render_node(&data, (v3s32) {x, y, z});
 175
 176         if (!data.batch->textures.siz && !data.batch_transparent->textures.siz) {
 177                 model_batch_free(data.batch);
 178                 model_batch_free(data.batch_transparent);
 179                 return NULL;
 180         }
 181
 182         Model *model = model_create();
 183         model->extra = chunk;
 184         model->box = (aabb3f32) {
 185                 v3f32_sub((v3f32) {-1.0f, -1.0f, -1.0f}, center_offset),
 186                 v3f32_add((v3f32) {+1.0f, +1.0f, +1.0f}, center_offset)};
 187         model->callbacks.step = animate ? &animate_chunk_model : NULL;
 188         model->callbacks.delete = &model_free_meshes;
 189         model->flags.frustum_culling = 1;
 190         model->flags.transparent = data.transparent;
 191
 192         model->root->visible = data.visible;
 193         model->root->pos = v3f32_add(v3s32_to_f32(data.chunkp), center_offset);
 194         model->root->scale = (v3f32) {0.0f, 0.0f, 0.0f};
 195
 196         if (data.visible) {
 197                 model_node_add_batch(model->root, data.batch);
 198                 model_node_add_batch(model->root, data.batch_transparent);
 199         } else {
 200                 model_batch_free(data.batch);
 201                 model_batch_free(data.batch_transparent);
 202         }
 203
 204         return model;
 205 }
 206
 207 bool terrain_gfx_init()
 208 {
 209         GLint texture_units;
 210         glGetIntegerv(GL_MAX_TEXTURE_UNITS, &texture_units); GL_DEBUG
 211
 212         char *shader_defs;
 213         asprintf(&shader_defs,
 214                 "#define MAX_TEXTURE_UNITS %d\n"
 215                 "#define VIEW_DISTANCE %lf\n",
 216                 texture_units,
 217                 client_config.view_distance
 218         );
 219
 220         if (!shader_program_create(RESSOURCE_PATH "shaders/3d/terrain", &shader_prog, shader_defs)) {
 221                 fprintf(stderr, "[error] failed to create terrain shader program\n");
 222                 return false;
 223         }
 224
 225         free(shader_defs);
 226
 227         loc_VP = glGetUniformLocation(shader_prog, "VP"); GL_DEBUG
 228
 229         GLint texture_indices[texture_units];
 230         for (GLint i = 0; i < texture_units; i++)
 231                 texture_indices[i] = i;
 232
 233         glProgramUniform1iv(shader_prog, glGetUniformLocation(shader_prog, "textures"), texture_units, texture_indices); GL_DEBUG
 234
 235         model_shader.prog = shader_prog;
 236         model_shader.loc_transform = glGetUniformLocation(shader_prog, "model"); GL_DEBUG
 237
 238         light_shader.prog = shader_prog;
 239         light_shader_locate(&light_shader);
 240
 241         return true;
 242 }
 243
 244 void terrain_gfx_deinit()
 245 {
 246         glDeleteProgram(shader_prog); GL_DEBUG
 247 }
 248
 249 void terrain_gfx_update()
 250 {
 251         glProgramUniformMatrix4fv(shader_prog, loc_VP, 1, GL_FALSE, frustum[0]); GL_DEBUG
 252         light_shader_update(&light_shader);
 253 }
 254
 255 void terrain_gfx_make_chunk_model(TerrainChunk *chunk)
 256 {
 257         TerrainChunkMeta *meta = chunk->extra;
 258
 259         bool animate = true;
 260
 261         pthread_mutex_lock(&chunk->mtx);
 262         if (meta->model && meta->model->root->scale.x == 1.0f)
 263                 animate = false;
 264         pthread_mutex_unlock(&chunk->mtx);
 265
 266         Model *model = create_chunk_model(chunk, animate);
 267
 268         pthread_mutex_lock(&chunk->mtx);
 269
 270         if (meta->model) {
 271                 if (model) {
 272                         model->callbacks.step = meta->model->callbacks.step;
 273                         model->root->scale = meta->model->root->scale;
 274                         model_node_transform(model->root);
 275                 }
 276
 277                 meta->model->replace = model;
 278                 meta->model->flags.delete = 1;
 279         } else if (model) {
 280                 model_scene_add(model);
 281         }
 282
 283         meta->model = model;
 284         pthread_mutex_unlock(&chunk->mtx);
 285 }