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prosperon/source/engine/3d/model.c

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#include "model.h"
#include "log.h"
#include "resources.h"
#include "shader.h"
#include "stb_ds.h"
#include "font.h"
#include "window.h"
#include "diffuse.sglsl.h"
#include "render.h"
// #define HANDMADE_MATH_USE_TURNS
#include "HandmadeMath.h"
#include "math.h"
#include "time.h"
#define CGLTF_IMPLEMENTATION
#include <cgltf.h>
#include <stdlib.h>
#include <string.h>
#include "texture.h"
#include "sokol/sokol_gfx.h"
static struct {
char *key;
struct model *value;
} *modelhash = NULL;
static void processnode();
static void processmesh();
static void processtexture();
static sg_shader model_shader;
static sg_pipeline model_pipe;
void model_init() {
model_shader = sg_make_shader(diffuse_shader_desc(sg_query_backend()));
model_pipe = sg_make_pipeline(&(sg_pipeline_desc){
.shader = model_shader,
.layout = {
.attrs = {
[0].format = SG_VERTEXFORMAT_FLOAT3,
[0].buffer_index = 0, /* position */
[1].format = SG_VERTEXFORMAT_USHORT2N,
[1].buffer_index = 1, /* tex coords */
[2].format = SG_VERTEXFORMAT_UINT10_N2,
[2].buffer_index = 2, /* normal */
},
},
.index_type = SG_INDEXTYPE_UINT16,
.cull_mode = SG_CULLMODE_FRONT,
.depth.write_enabled = true,
.depth.compare = SG_COMPAREFUNC_LESS_EQUAL
});
}
struct model *GetExistingModel(const char *path) {
if (!path || path[0] == '\0') return NULL;
int index = shgeti(modelhash, path);
if (index != -1) return modelhash[index].value;
return MakeModel(path);
}
cgltf_attribute *get_attr_type(cgltf_primitive p, cgltf_attribute_type t)
{
for (int i = 0; i < p.attributes_count; i++) {
if (p.attributes[i].type == t)
return &p.attributes[i];
}
return NULL;
}
unsigned short pack_short_texcoord(float c)
{
return c * USHRT_MAX;
}
uint32_t pack_int10_n2(float *norm)
{
uint32_t ni[3];
for (int i = 0; i < 3; i++) {
ni[i] = fabs(norm[i]) * 511.0 + 0.5;
ni[i] = (ni[i] > 511) ? 511 : ni[i];
ni[i] = ( norm[i] < 0.0 ) ? -ni[i] : ni[i];
}
return (ni[0] & 0x3FF) | ( (ni[1] & 0x3FF) << 10) | ( (ni[2] & 0x3FF) << 20) | ( (0 & 0x3) << 30);
}
struct model *MakeModel(const char *path) {
YughWarn("Making the model from %s.", path);
cgltf_options options = {0};
cgltf_data *data = NULL;
cgltf_result result = cgltf_parse_file(&options, path, &data);
if (result) {
YughError("CGLTF could not parse file %s, err %d.", path, result);
return NULL;
}
result = cgltf_load_buffers(&options, data, path);
if (result) {
YughError("CGLTF could not load buffers for file %s, err %d.", path, result);
return NULL;
}
struct model *model = calloc(1, sizeof(*model));
/* TODO: Optimize by grouping by material. One material per draw. */
YughWarn("Model has %d materials.", data->materials_count);
float vs[65535*3];
uint16_t idxs[65535];
for (int i = 0; i < data->meshes_count; i++) {
cgltf_mesh *mesh = &data->meshes[i];
struct mesh newmesh = {0};
arrput(model->meshes,newmesh);
YughWarn("Making mesh %d. It has %d primitives.", i, mesh->primitives_count);
for (int j = 0; j < mesh->primitives_count; j++) {
cgltf_primitive primitive = mesh->primitives[j];
if (primitive.indices) {
int c = primitive.indices->count;
memcpy(idxs, cgltf_buffer_view_data(primitive.indices->buffer_view), sizeof(uint16_t) * c);
model->meshes[j].bind.index_buffer = sg_make_buffer(&(sg_buffer_desc){
.data.ptr = idxs,
.data.size = sizeof(uint16_t) * c,
.type = SG_BUFFERTYPE_INDEXBUFFER});
model->meshes[j].face_count = c;
} else {
YughWarn("Model does not have indices. Generating them.");
int c = primitive.attributes[0].data->count;
model->meshes[j].face_count = c;
for (int z = 0; z < c; z++)
idxs[z] = z;
model->meshes[j].bind.index_buffer = sg_make_buffer(&(sg_buffer_desc){
.data.ptr = idxs,
.data.size = sizeof(uint16_t) * c,
.type = SG_BUFFERTYPE_INDEXBUFFER});
}
if (primitive.material->has_pbr_metallic_roughness && primitive.material->pbr_metallic_roughness.base_color_texture.texture) {
// YughWarn("Texture is %s.", primitive.material->pbr_metallic_roughness.base_color_texture.texture->image->uri);
model->meshes[j].bind.fs.images[0] = texture_pullfromfile(primitive.material->pbr_metallic_roughness.base_color_texture.texture->image->uri)->id;
} else
model->meshes[j].bind.fs.images[0] = texture_pullfromfile("k")->id;
cgltf_texture *tex;
if (tex = primitive.material->normal_texture.texture) {
model->meshes[j].bind.fs.images[1] = texture_pullfromfile(tex->image->uri)->id;
} else
model->meshes[j].bind.fs.images[1] = texture_pullfromfile("k")->id;
model->meshes[j].bind.fs.images[2] = ddimg;
int has_norm = 0;
for (int k = 0; k < primitive.attributes_count; k++) {
cgltf_attribute attribute = primitive.attributes[k];
int n = cgltf_accessor_unpack_floats(attribute.data, NULL, 0); /* floats per element x num elements */
cgltf_accessor_unpack_floats(attribute.data, vs, n);
uint32_t *packed_norms;
unsigned short *packed_coords;
switch (attribute.type) {
case cgltf_attribute_type_position:
model->meshes[j].bind.vertex_buffers[0] = sg_make_buffer(&(sg_buffer_desc){
.data.ptr = vs,
.data.size = sizeof(float) * n});
break;
case cgltf_attribute_type_normal:
has_norm = 1;
packed_norms = malloc(model->meshes[j].face_count * sizeof(uint32_t));;
for (int i = 0; i < model->meshes[j].face_count; i++)
packed_norms[i] = pack_int10_n2(vs + i*3);
model->meshes[j].bind.vertex_buffers[2] = sg_make_buffer(&(sg_buffer_desc){
.data.ptr = packed_norms,
.data.size = sizeof(uint32_t) * model->meshes[j].face_count});
free (packed_norms);
break;
case cgltf_attribute_type_tangent:
break;
case cgltf_attribute_type_texcoord:
packed_coords = malloc(model->meshes[j].face_count * 2 * sizeof(unsigned short));
for (int i = 0; i < model->meshes[j].face_count*2; i++)
packed_coords[i] = pack_short_texcoord(vs[i]);
model->meshes[j].bind.vertex_buffers[1] = sg_make_buffer(&(sg_buffer_desc){
.data.ptr = vs,
.data.size = sizeof(unsigned short) * 2 * model->meshes[j].face_count});
free(packed_coords);
break;
}
}
if (!has_norm) {
YughWarn("Model does not have normals. Generating them.");
uint32_t norms[model->meshes[j].face_count];
cgltf_attribute *pa = get_attr_type(primitive, cgltf_attribute_type_position);
int n = cgltf_accessor_unpack_floats(pa->data, NULL,0);
float ps[n];
cgltf_accessor_unpack_floats(pa->data,ps,n);
for (int i = 0, face=0; i < model->meshes[j].face_count/3; i++, face+=9) {
int o = face;
HMM_Vec3 a = {ps[o], ps[o+1],ps[o+2]};
o += 3;
HMM_Vec3 b = {ps[o], ps[o+1],ps[o+2]};
o += 3;
HMM_Vec3 c = {ps[o], ps[o+1],ps[o+2]};
HMM_Vec3 norm = HMM_NormV3(HMM_Cross(HMM_SubV3(b,a), HMM_SubV3(c,a)));
uint32_t packed_norm = pack_int10_n2(norm.Elements);
for (int j = 0; j < 3; j++)
norms[i*3+j] = packed_norm;
}
model->meshes[j].bind.vertex_buffers[2] = sg_make_buffer(&(sg_buffer_desc){
.data.ptr = norms,
.data.size = sizeof(uint32_t) * model->meshes[j].face_count
});
}
}
}
return model;
}
HMM_Vec3 eye = {50,10,5};
void draw_model(struct model *model, HMM_Mat4 amodel, HMM_Mat4 lsm) {
HMM_Mat4 proj = HMM_Perspective_RH_ZO(45, (float)mainwin.width / mainwin.height, 0.1, 10000);
HMM_Vec3 center = {0.f, 0.f, 0.f};
HMM_Vec3 up = {0.f, 1.f, 0.f};
HMM_Mat4 view = HMM_LookAt_RH(eye, center, up);
HMM_Mat4 vp = HMM_MulM4(proj, view);
HMM_Mat4 mvp = HMM_MulM4(vp, amodel);
HMM_Vec3 lp = {1, 1, 1};
HMM_Vec3 dir_dir = HMM_NormV3(HMM_SubV3(center, dirl_pos));
HMM_Mat4 m2[4];
m2[0] = view;
m2[1] = amodel;
m2[2] = proj;
m2[3] = lsm;
HMM_Vec3 f_ubo[5];
f_ubo[0] = lp;
f_ubo[1] = dir_dir;
f_ubo[2] = eye;
f_ubo[3] = eye;
f_ubo[4] = eye;
sg_apply_pipeline(model_pipe);
sg_apply_uniforms(SG_SHADERSTAGE_VS, 0, SG_RANGE_REF(m2));
sg_apply_uniforms(SG_SHADERSTAGE_FS, 0, SG_RANGE_REF(f_ubo));
for (int i = 0; i < arrlen(model->meshes); i++) {
sg_apply_bindings(&model->meshes[i].bind);
sg_draw(0, model->meshes[i].face_count, 1);
}
}
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