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/*
* Copyright (C) 2018 Tomasz Kramkowski <tk@the-tk.com>
* SPDX-License-Identifier: MIT
*/
#include <assert.h>
#include "eprintf.h"
#include "glprog.h"
#include "linmath.h"
#include "model.h"
#include "nelem.h"
#include "vertex.h"
void model_load(struct model *mdl, const struct fmd *fmd)
{
GLuint vbo, ebo;
struct vertex *v;
assert(mdl != NULL);
assert(fmd != NULL);
gl_va_gen(1, &mdl->vao);
gl_va_bind(mdl->vao);
gl_buf_gen(1, &vbo);
gl_buf_bind(GL_ARRAY_BUFFER, vbo);
gl_buf_data(GL_ARRAY_BUFFER, fmd->nverts * sizeof *fmd->verts, fmd->verts, GL_STATIC_DRAW);
gl_buf_gen(1, &ebo);
gl_buf_bind(GL_ELEMENT_ARRAY_BUFFER, ebo);
gl_buf_data(GL_ELEMENT_ARRAY_BUFFER, fmd->ntris * sizeof *fmd->tris, fmd->tris, GL_STATIC_DRAW);
v = &fmd->verts[0];
#define SH_IN(_, name) \
gl_va_define(prog.attr.name, NELEM(v->name), GL_FLOAT, GL_FALSE, sizeof *v, (void *)offsetof(struct vertex, name)); \
gl_va_enable(prog.attr.name);
#include "shaders/data.h"
// TODO: materials, use a shared material set
mdl->nmeshes = fmd->nmeshes;
mdl->meshes = emalloc(mdl->nmeshes * sizeof *mdl->meshes);
for (int i = 0; i < fmd->nmeshes; i++) {
struct mesh *m = &mdl->meshes[i];
struct fmd_mesh *fm = &fmd->meshes[i];
if (fm->midx >= 0)
m->mtl = mtl_load(fmd->mtls[fm->midx]);
else
m->mtl = -1;
m->elems.idx = fm->tidx * NELEM(*fmd->tris);
m->elems.cnt = fm->tcnt * NELEM(*fmd->tris);
}
}
void model_render(struct model *mdl)
{
gl_va_bind(mdl->vao);
for (int i = 0; i < mdl->nmeshes; i++) {
struct mesh *m = &mdl->meshes[i];
mtl_use(m->mtl);
gl_draw_elems(GL_TRIANGLES, m->elems.cnt, GL_UNSIGNED_INT, &((GLuint *)NULL)[m->elems.idx]);
}
}
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