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This commit is contained in:
alessandro bason
parent
507d635433
commit
1c13514a4d
45 changed files with 2615 additions and 2014 deletions
234
src/obj.c
234
src/obj.c
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@ -5,7 +5,7 @@
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#define CGLTF_IMPLEMENTATION
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#include "libs/cgltf.h"
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#include "vecmath.h"
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#include "libs/handmademath.h"
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typedef struct vertex_t vertex_t;
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struct vertex_t {
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@ -15,236 +15,12 @@ struct vertex_t {
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vec2 lightmap;
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};
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typedef struct material_t material_t;
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struct material_t {
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// texture
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vec3 ambient_color;
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vec3 diff_color;
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/*
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* (*) -> unused
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* Ka: ambient color
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* Kd: diffuse color
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* Ks*: specular color
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* Ns*: specular exponent
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* d*: dissolve (opacity)
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* Ni*: optical density (???)
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* Ke*: emissive color
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* illum*: illumination mode:
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0. Color on and Ambient off
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1. Color on and Ambient on
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2. Highlight on
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3. Reflection on and Ray trace on
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4. Transparency: Glass on, Reflection: Ray trace on
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5. Reflection: Fresnel on and Ray trace on
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6. Transparency: Refraction on, Reflection: Fresnel off and Ray trace on
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7. Transparency: Refraction on, Reflection: Fresnel on and Ray trace on
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8. Reflection on and Ray trace off
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9. Transparency: Glass on, Reflection: Ray trace off
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10. Casts shadows onto invisible surfaces
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* */
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};
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typedef struct obj_t obj_t;
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struct obj_t {
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sg_bindings bindings;
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u16 draw_count;
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};
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darr_define(f2_list_t, vec2);
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darr_define(f3_list_t, vec3);
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darr_define(i3_list_t, int3);
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#define list_get(l, i) do { } while (0)
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typedef struct {
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f3_list_t *verts;
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f3_list_t *norms;
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f2_list_t *uvs;
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i3_list_t *faces;
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u32 vcount;
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u32 ncount;
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u32 tcount;
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u32 fcount;
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} obj_ctx_t;
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#define READ_F2(arr, c) do { \
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vec2 v = {0}; \
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istr_skip_whitespace(in); istr_get_float(in, &v.x); \
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istr_skip_whitespace(in); istr_get_float(in, &v.y); \
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darr_push(arena, arr, v); \
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++(c); \
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} while (0)
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#define READ_F3(arr, c) do { \
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vec3 v = {0}; \
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istr_skip_whitespace(in); istr_get_float(in, &v.x); \
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istr_skip_whitespace(in); istr_get_float(in, &v.y); \
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istr_skip_whitespace(in); istr_get_float(in, &v.z); \
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darr_push(arena, arr, v); \
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++(c); \
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} while (0)
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#define READ_I3(arr, c) do { \
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int3 v = {0}; \
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istr_skip_whitespace(in); istr_get_i32(in, &v.x); \
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istr_skip_whitespace(in); istr_get_i32(in, &v.y); \
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istr_skip_whitespace(in); istr_get_i32(in, &v.z); \
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darr_push(arena, arr, v); \
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++(c); \
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} while (0)
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void obj__parse_line(arena_t *arena, instream_t *in, obj_ctx_t *ctx) {
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if (istr_peek(in) == '#') {
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return;
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}
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switch (istr_peek(in)) {
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// vertex stuff
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case 'v':
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istr_skip(in, 1);
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switch (istr_get(in)) {
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// vertex
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case ' ':
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READ_F3(ctx->verts, ctx->vcount);
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break;
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// normal
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case 'n':
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READ_F3(ctx->norms, ctx->ncount);
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break;
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// texture
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case 't':
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READ_F2(ctx->uvs, ctx->tcount);
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break;
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}
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return;
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// faces
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case 'f':
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READ_I3(ctx->faces, ctx->fcount);
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return;
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// smooth shading
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case 's':
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// not implemented
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return;
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// group
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case 'g':
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// not implemented
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return;
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// object
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case 'o':
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// not implemented
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return;
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case '#':
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return;
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}
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strview_t word = istr_get_word(in);
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if (strv_equals(word, strv("mtllib"))) {
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// load mtl file
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}
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else if (strv_equals(word, strv("usemtl"))) {
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// use material
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}
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}
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obj_t obj_load(arena_t scratch, strview_t filename) {
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obj_t out = {0};
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str_t text = os_file_read_all_str(&scratch, filename);
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instream_t in = istr_init(strv(text));
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obj_ctx_t ctx = {0};
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while (!istr_is_finished(&in)) {
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instream_t line = istr_init(istr_get_line(&in));
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obj__parse_line(&scratch, &line, &ctx);
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}
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debug("%u %u %u", ctx.vcount, ctx.ncount, ctx.tcount);
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colla_assert(ctx.vcount == ctx.ncount && ctx.vcount == ctx.tcount);
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// copy over vertex data
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vertex_t *vertices = alloc(&scratch, vertex_t, ctx.vcount);
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{
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u32 i = 0;
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for_each (v, ctx.verts) {
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for (int k = 0; k < v->count; ++k) {
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vertices[i++].pos = v->items[k];
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}
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}
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}
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{
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u32 i = 0;
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for_each (v, ctx.uvs) {
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for (int k = 0; k < v->count; ++k) {
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vertices[i++].tex = v->items[k];
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}
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}
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}
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{
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u32 i = 0;
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for_each (v, ctx.norms) {
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for (int k = 0; k < v->count; ++k) {
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vertices[i++].norm = v->items[k];
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}
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}
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}
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// copy over indices data
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u32 icount = ctx.fcount * 3;
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u16 *indices = alloc(&scratch, u16, icount);
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{
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u32 i = 0;
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for_each (v, ctx.faces) {
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for (int k = 0; k < v->count; ++k) {
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indices[i++] = v->items[k].x - 1;
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indices[i++] = v->items[k].y - 1;
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indices[i++] = v->items[k].z - 1;
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}
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}
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}
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sg_buffer vertex_buffer = sg_make_buffer(&(sg_buffer_desc){
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.data = {
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.ptr = vertices,
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.size = sizeof(vertex_t) * ctx.vcount,
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},
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.usage = {
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.vertex_buffer = true,
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.immutable = true,
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},
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});
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sg_buffer index_buffer = sg_make_buffer(&(sg_buffer_desc){
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.data = {
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.ptr = indices,
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.size = sizeof(u16) * ctx.fcount * 3,
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},
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.usage = {
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.index_buffer = true,
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.immutable = true,
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},
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});
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return (obj_t){
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.bindings = {
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.vertex_buffers[0] = vertex_buffer,
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.index_buffer = index_buffer,
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// .views[0] = {0},
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},
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.draw_count = icount,
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};
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}
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cgltf_result obj__cgltf_file_read_cb(
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const cgltf_memory_options *m,
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const cgltf_file_options *opt,
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@ -466,25 +242,25 @@ scene_t obj_load_gltf(arena_t scratch, strview_t filename) {
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case cgltf_attribute_type_position:
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{
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for (usize k = 0; k < acc->count; ++k) {
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cgltf_accessor_read_float(acc, k, verts[k].pos.data, 3);
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cgltf_accessor_read_float(acc, k, verts[k].pos.elements, 3);
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}
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break;
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}
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case cgltf_attribute_type_normal:
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for (usize k = 0; k < acc->count; ++k) {
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cgltf_accessor_read_float(acc, k, verts[k].norm.data, 3);
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cgltf_accessor_read_float(acc, k, verts[k].norm.elements, 3);
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}
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break;
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case cgltf_attribute_type_texcoord:
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{
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if (attr->index == 0) {
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for (usize k = 0; k < acc->count; ++k) {
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cgltf_accessor_read_float(acc, k, verts[k].tex.data, 2);
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cgltf_accessor_read_float(acc, k, verts[k].tex.elements, 2);
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}
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}
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else {
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for (usize k = 0; k < acc->count; ++k) {
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cgltf_accessor_read_float(acc, k, verts[k].lightmap.data, 2);
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cgltf_accessor_read_float(acc, k, verts[k].lightmap.elements, 2);
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}
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}
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break;
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