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