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[dragonblocks_alpha.git] / src / client / mesh.c

diff --git a/src/client/mesh.c b/src/client/mesh.c
index 49df5060be3eb97275a50f0264b5647eebec7198..d778ce11a5c0ca5de5b5ccf2e47bb0f8fb90bf2d 100644 (file)
--- a/src/client/mesh.c
+++ b/src/client/mesh.c
@@ -1,8 +1,133 @@
+#include <dragonstd/tree.h>
 #include <stddef.h>
+#include <stdio.h>
 #include <stdlib.h>
+#include "client/cube.h"
 #include "client/gl_debug.h"
 #include "client/mesh.h"
 
+typedef struct {
+       v3s32 pos;
+       v3f32 color;
+} LoadedVoxel;
+
+typedef struct {
+       Tree voxels;
+       Array vertices;
+} LoadedRenderArgs;
+
+static v3s32 face_dir[6] = {
+       {+0, +0, -1},
+       {+0, +0, +1},
+       {-1, +0, +0},
+       {+1, +0, +0},
+       {+0, -1, +0},
+       {+0, +1, +0},
+};
+
+typedef struct {
+       v3f32 pos;
+       v3f32 normal;
+       v3f32 color;
+} __attribute__((packed)) LoadedVertex;
+static VertexLayout loaded_layout = {
+       .attributes = (VertexAttribute[]) {
+               {GL_FLOAT, 3, sizeof(v3f32)}, // position
+               {GL_FLOAT, 3, sizeof(v3f32)}, // normal
+               {GL_FLOAT, 3, sizeof(v3f32)}, // color
+       },
+       .count = 3,
+       .size = sizeof(LoadedVertex),
+};
+
+static int cmp_loaded_voxel(const LoadedVoxel *voxel, const v3s32 *pos)
+{
+       return v3s32_cmp(&voxel->pos, pos);
+}
+
+static void render_loaded_voxel(LoadedVoxel *voxel, LoadedRenderArgs *args)
+{
+       v3f32 pos = v3s32_to_f32(voxel->pos);
+       for (int f = 0; f < 6; f++) {
+               v3s32 neigh_pos = v3s32_add(voxel->pos, face_dir[f]);
+               if (tree_get(&args->voxels, &neigh_pos, &cmp_loaded_voxel, NULL))
+                       continue;
+
+               for (int v = 0; v < 6; v++)
+                       array_apd(&args->vertices, &(LoadedVertex) {
+                               v3f32_add(cube_vertices[f][v].position, pos),
+                               cube_vertices[f][v].normal,
+                               voxel->color,
+                       });
+       }
+}
+
+void mesh_load(Mesh *mesh, const char *path)
+{
+       mesh->layout = &loaded_layout;
+       mesh->vao = mesh->vbo = 0;
+       mesh->data = NULL;
+       mesh->count = 0;
+       mesh->free_data = true;
+
+       LoadedRenderArgs args;
+       tree_ini(&args.voxels);
+       array_ini(&args.vertices, sizeof(LoadedVertex), 500);
+
+       FILE *file = fopen(path, "r");
+       if (!file) {
+               fprintf(stderr, "[warning] failed to open mesh %s\n", path);
+               return;
+       }
+
+       char *line = NULL;
+       size_t siz = 0;
+       ssize_t length;
+       int count = 0;
+
+       while ((length = getline(&line, &siz, file)) > 0) {
+               count++;
+
+               if (*line == '#')
+                       continue;
+
+               LoadedVoxel *voxel = malloc(sizeof *voxel);
+
+               v3s32 color;
+               if (sscanf(line, "%d %d %d %2x%2x%2x",
+                               &voxel->pos.x, &voxel->pos.z, &voxel->pos.y,
+                               &color.x, &color.y, &color.z) != 6) {
+                       fprintf(stderr, "[warning] syntax error in mesh %s in line %d: %s\n",
+                               path, count, line);
+                       free(voxel);
+                       continue;
+               }
+
+               voxel->color = (v3f32) {
+                       (f32) color.x / 0xFF,
+                       (f32) color.y / 0xFF,
+                       (f32) color.z / 0xFF,
+               };
+
+               if (!tree_add(&args.voxels, &voxel->pos, voxel, &cmp_loaded_voxel, NULL)) {
+                       fprintf(stderr, "[warning] more than one voxel at position (%d, %d, %d) in mesh %s in line %d\n",
+                               voxel->pos.x, voxel->pos.y, voxel->pos.z, path, count);
+                       free(voxel);
+               }
+       }
+
+       if (line)
+               free(line);
+
+       fclose(file);
+
+       tree_trv(&args.voxels, &render_loaded_voxel, &args, NULL, 0);
+       tree_clr(&args.voxels, &free, NULL, NULL, 0);
+
+       mesh->data = args.vertices.ptr;
+       mesh->count = args.vertices.siz;
+}
+
 // upload data to GPU (only done once)
 void mesh_upload(Mesh *mesh)
 {