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Load glTF

This commit is contained in:
Wilhem Barbier 2019-05-14 14:06:17 +02:00
parent c1594fa445
commit e01a381aec
1 changed files with 293 additions and 27 deletions
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320
src/models.c
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@ -60,6 +60,7 @@
#if defined(SUPPORT_FILEFORMAT_GLTF) #if defined(SUPPORT_FILEFORMAT_GLTF)
#define CGLTF_IMPLEMENTATION #define CGLTF_IMPLEMENTATION
#include "external/cgltf.h" // glTF file format loading #include "external/cgltf.h" // glTF file format loading
#include "external/stb_image.h"
#endif #endif
#if defined(SUPPORT_MESH_GENERATION) #if defined(SUPPORT_MESH_GENERATION)
@ -637,7 +638,7 @@ Model LoadModel(const char *fileName)
if (IsFileExtension(fileName, ".obj")) model = LoadOBJ(fileName); if (IsFileExtension(fileName, ".obj")) model = LoadOBJ(fileName);
#endif #endif
#if defined(SUPPORT_FILEFORMAT_GLTF) #if defined(SUPPORT_FILEFORMAT_GLTF)
if (IsFileExtension(fileName, ".gltf")) model = LoadGLTF(fileName); if (IsFileExtension(fileName, ".gltf") || IsFileExtension(fileName, ".glb")) model = LoadGLTF(fileName);
#endif #endif
#if defined(SUPPORT_FILEFORMAT_IQM) #if defined(SUPPORT_FILEFORMAT_IQM)
if (IsFileExtension(fileName, ".iqm")) model = LoadIQM(fileName); if (IsFileExtension(fileName, ".iqm")) model = LoadIQM(fileName);
@ -3241,6 +3242,108 @@ static Model LoadIQM(const char *fileName)
#endif #endif
#if defined(SUPPORT_FILEFORMAT_GLTF) #if defined(SUPPORT_FILEFORMAT_GLTF)
const unsigned char base64_table[] = {
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 62, 0, 0, 0, 63, 52, 53,
54, 55, 56, 57, 58, 59, 60, 61, 0, 0,
0, 0, 0, 0, 0, 0, 1, 2, 3, 4,
5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
25, 0, 0, 0, 0, 0, 0, 26, 27, 28,
29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
49, 50, 51
};
int GetSizeBase64(char* input)
{
int size = 0;
for (int i = 0; input[4*i] != 0; i++)
{
if (input[4*i+3] == '=')
{
if (input[4*i+2] == '=')
{
size += 1;
}
else
{
size += 2;
}
}
else size += 3;
}
return size;
}
unsigned char* DecodeBase64(char* input, int* size)
{
*size = 0;
for (int i = 0; input[4*i] != 0; i++)
{
if (input[4*i+3] == '=')
{
if (input[4*i+2] == '=')
{
*size += 1;
}
else
{
*size += 2;
}
}
else *size += 3;
}
unsigned char* buf = (unsigned char*)RL_MALLOC(*size);
for (int i = 0; i < *size/3; i++)
{
unsigned char a = base64_table[(int)input[4*i]];
unsigned char b = base64_table[(int)input[4*i+1]];
unsigned char c = base64_table[(int)input[4*i+2]];
unsigned char d = base64_table[(int)input[4*i+3]];
buf[3*i] = (a << 2) | (b >> 4);
buf[3*i+1] = (b << 4) | (c >> 2);
buf[3*i+2] = (c << 6) | d;
}
if (*size % 3 == 1)
{
int n = *size/3;
unsigned char a = base64_table[(int)input[4*n]];
unsigned char b = base64_table[(int)input[4*n+1]];
buf[*size-1] = (a << 2) | (b >> 4);
}
else if (*size % 3 == 2)
{
int n = *size/3 ;
unsigned char a = base64_table[(int)input[4*n]];
unsigned char b = base64_table[(int)input[4*n+1]];
unsigned char c = base64_table[(int)input[4*n+2]];
buf[*size-2] = (a << 2) | (b >> 4);
buf[*size-1] = (b << 4) | (c >> 2);
}
return buf;
}
#define LOAD_ACCESSOR(type, nbcomp, acc, dst) \
{ \
int n = 0; \
type* buf = (type*)acc->buffer_view->buffer->data+acc->buffer_view->offset/sizeof(type)+acc->offset/sizeof(type); \
for (int k = 0; k < acc->count; k++) {\
for (int l = 0; l < nbcomp; l++) {\
dst[nbcomp*k+l] = buf[n+l];\
}\
n += acc->stride/sizeof(type);\
}\
}
// Load glTF mesh data // Load glTF mesh data
static Model LoadGLTF(const char *fileName) static Model LoadGLTF(const char *fileName)
{ {
@ -3266,48 +3369,211 @@ static Model LoadGLTF(const char *fileName)
// glTF data loading // glTF data loading
cgltf_options options = { 0 }; cgltf_options options = { 0 };
cgltf_data *data; cgltf_data *data = NULL;
cgltf_result result = cgltf_parse(&options, buffer, size, &data); cgltf_result result = cgltf_parse(&options, buffer, size, &data);
RL_FREE(buffer);
if (result == cgltf_result_success) if (result == cgltf_result_success)
{ {
TraceLog(LOG_INFO, "[%s][%s] Model meshes/materials: %i/%i", (data->file_type == 2)? "glb" : "gltf", data->meshes_count, data->materials_count);
TraceLog(LOG_INFO, "[%s][%s] Model meshes/materials: %i/%i", fileName, (data->file_type == 2)? "glb" : "gltf", data->meshes_count, data->materials_count);
// Read data buffers // Read data buffers
result = cgltf_load_buffers(&options, data, fileName); result = cgltf_load_buffers(&options, data, fileName);
// Process glTF data and map to model int nb_primitives = 0;
model.meshCount = data->meshes_count; for (int i = 0; i < data->meshes_count; i++)
model.meshes = RL_MALLOC(model.meshCount*sizeof(Mesh));
for (int i = 0; i < model.meshCount; i++)
{ {
// NOTE: Only support meshes defined by triangle primitives nb_primitives += (int)data->meshes[i].primitives_count;
//if (data->meshes[i].primitives[n].type == cgltf_primitive_type_triangles)
{
// data.meshes[i].name not used
model.meshes[i].vertexCount = data->meshes[i].primitives_count*3;
model.meshes[i].triangleCount = data->meshes[i].primitives_count;
// data.meshes[i].weights not used (array of weights to be applied to the Morph Targets)
model.meshes[i].vertices = RL_MALLOC(sizeof(float)*model.meshes[i].vertexCount*3); // Default vertex positions
model.meshes[i].normals = RL_MALLOC(sizeof(float)*model.meshes[i].vertexCount*3); // Default vertex normals
model.meshes[i].texcoords = RL_MALLOC(sizeof(float)*model.meshes[i].vertexCount*2); // Default vertex texcoords
model.meshes[i].indices = RL_MALLOC(sizeof(unsigned short)*model.meshes[i].triangleCount*3);
}
} }
// NOTE: data.buffers[] should be loaded to model.meshes and data.images[] should be loaded to model.materials // Process glTF data and map to model
// Use buffers[n].uri and images[n].uri... or use cgltf_load_buffers(&options, data, fileName); model.meshCount = nb_primitives;
model.meshes = RL_CALLOC(model.meshCount, sizeof(Mesh));
model.materialCount = data->materials_count + 1;
model.materials = RL_MALLOC(model.materialCount * sizeof(Material));
model.meshMaterial = RL_MALLOC(model.meshCount * sizeof(int));
for (int i = 0; i < model.materialCount - 1; i++)
{
Texture2D texture;
const char* dir_path = GetDirectoryPath(fileName);
Color tint;
if (data->materials[i].pbr_metallic_roughness.base_color_factor)
{
tint.r = (unsigned char)(data->materials[i].pbr_metallic_roughness.base_color_factor[0] * 255.99f);
tint.g = (unsigned char)(data->materials[i].pbr_metallic_roughness.base_color_factor[1] * 255.99f);
tint.b = (unsigned char)(data->materials[i].pbr_metallic_roughness.base_color_factor[2] * 255.99f);
tint.a = (unsigned char)(data->materials[i].pbr_metallic_roughness.base_color_factor[3] * 255.99f);
}
else
{
tint.r = 1.f;
tint.g = 1.f;
tint.b = 1.f;
tint.a = 1.f;
}
if (data->materials[i].pbr_metallic_roughness.base_color_texture.texture)
{
cgltf_image* img = data->materials[i].pbr_metallic_roughness.base_color_texture.texture->image;
if (img->uri) {
if (strlen(img->uri) > 5 && img->uri[0] == 'd'
&& img->uri[1] == 'a'
&& img->uri[2] == 't'
&& img->uri[3] == 'a'
&& img->uri[4] == ':')
{
// data URI
// format: data:<mediatype>;base64,<data>
// find the comma
int i = 0;
while (img->uri[i] != ',' && img->uri[i] != 0)
{
i++;
}
if (img->uri[i] == 0) {
TraceLog(LOG_WARNING, "[%s] Invalid data URI", fileName);
}
else
{
int size;
unsigned char* data = DecodeBase64(img->uri+i+1, &size);
int w, h;
unsigned char* raw = stbi_load_from_memory(data, size, &w, &h, NULL, 4);
Image image = LoadImagePro(raw, w, h, UNCOMPRESSED_R8G8B8A8);
ImageColorTint(&image, tint);
texture = LoadTextureFromImage(image);
UnloadImage(image);
}
}
else
{
char* texture_name = img->uri;
char* texture_path = RL_MALLOC(strlen(dir_path) + strlen(texture_name) + 2);
strcpy(texture_path, dir_path);
strcat(texture_path, "/");
strcat(texture_path, texture_name);
Image image = LoadImage(texture_path);
ImageColorTint(&image, tint);
texture = LoadTextureFromImage(image);
UnloadImage(image);
}
}
else if (img->buffer_view)
{
unsigned char* data = RL_MALLOC(img->buffer_view->size);
int n = img->buffer_view->offset;
int stride = img->buffer_view->stride ? img->buffer_view->stride : 1;
for (int i = 0; i < img->buffer_view->size; i++)
{
data[i] = ((unsigned char*)img->buffer_view->buffer->data)[n];
n += stride;
}
int w, h;
unsigned char* raw = stbi_load_from_memory(data, img->buffer_view->size, &w, &h, NULL, 4);
Image image = LoadImagePro(raw, w, h, UNCOMPRESSED_R8G8B8A8);
ImageColorTint(&image, tint);
texture = LoadTextureFromImage(image);
UnloadImage(image);
}
else
{
Image image = LoadImageEx(&tint, 1, 1);
texture = LoadTextureFromImage(image);
UnloadImage(image);
}
model.materials[i] = LoadMaterialDefault();
model.materials[i].maps[MAP_DIFFUSE].texture = texture;
}
}
model.materials[model.materialCount-1] = LoadMaterialDefault();
int prim_index = 0;
for (int i = 0; i < data->meshes_count; i++)
{
for (int p = 0; p < data->meshes[i].primitives_count; p++)
{
for (int j = 0; j < data->meshes[i].primitives[p].attributes_count; j++)
{
if (data->meshes[i].primitives[p].attributes[j].type == cgltf_attribute_type_position)
{
cgltf_accessor* acc = data->meshes[i].primitives[p].attributes[j].data;
model.meshes[prim_index].vertexCount = acc->count;
model.meshes[prim_index].vertices = RL_MALLOC(sizeof(float)*model.meshes[prim_index].vertexCount*3);
LOAD_ACCESSOR(float, 3, acc, model.meshes[prim_index].vertices)
}
else if (data->meshes[i].primitives[p].attributes[j].type == cgltf_attribute_type_normal)
{
cgltf_accessor* acc = data->meshes[i].primitives[p].attributes[j].data;
model.meshes[prim_index].normals = RL_MALLOC(sizeof(float)*acc->count*3);
LOAD_ACCESSOR(float, 3, acc, model.meshes[prim_index].normals)
}
else if (data->meshes[i].primitives[p].attributes[j].type == cgltf_attribute_type_texcoord)
{
cgltf_accessor* acc = data->meshes[i].primitives[p].attributes[j].data;
if (acc->component_type == cgltf_component_type_r_32f)
{
model.meshes[prim_index].texcoords = RL_MALLOC(sizeof(float)*acc->count*2);
LOAD_ACCESSOR(float, 2, acc, model.meshes[prim_index].texcoords)
}
else
{
// TODO: support normalized unsigned byte/unsigned short texture coordinates
TraceLog(LOG_WARNING, "[%s] Texture coordinates must be float", fileName);
}
}
}
cgltf_accessor* acc = data->meshes[i].primitives[p].indices;
if (acc)
{
if (acc->component_type == cgltf_component_type_r_16u)
{
model.meshes[prim_index].triangleCount = acc->count / 3;
model.meshes[prim_index].indices = RL_MALLOC(sizeof(unsigned short)*model.meshes[prim_index].triangleCount*3);
LOAD_ACCESSOR(unsigned short, 1, acc, model.meshes[prim_index].indices)
}
else
{
// TODO: support unsigned byte/unsigned int
TraceLog(LOG_WARNING, "[%s] Indices must be unsigned short", fileName);
}
}
else
{
// unindexed mesh
model.meshes[prim_index].triangleCount = model.meshes[prim_index].vertexCount / 3;
}
if (data->meshes[i].primitives[p].material)
{
// compute the offset
model.meshMaterial[prim_index] = data->meshes[i].primitives[p].material - data->materials;
}
else
{
model.meshMaterial[prim_index] = model.materialCount - 1;;
}
prim_index++;
}
}
cgltf_free(data); cgltf_free(data);
} }
else TraceLog(LOG_WARNING, "[%s] glTF data could not be loaded", fileName); else TraceLog(LOG_WARNING, "[%s] glTF data could not be loaded", fileName);
RL_FREE(buffer);
return model; return model;
} }
#endif #endif