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allow for multiple materials in obj files (#1408)

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* allow for multiple materials in obj files also fix obj_loader hash map issues

* minor fix for warning

Co-authored-by: codifies <nospam@antispam.com>
This commit is contained in:
chriscamacho 2020-10-08 19:31:59 +01:00 • committed by GitHub
parent 41192c6d4a
commit 6ebf6b4e72
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GPG key ID: 4AEE18F83AFDEB23
2 changed files with 137 additions and 114 deletions
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211
src/models.c
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@ -896,8 +896,8 @@ Material *LoadMaterials(const char *fileName, int *materialCount)
#if defined(SUPPORT_FILEFORMAT_MTL)
if (IsFileExtension(fileName, ".mtl"))
{
tinyobj_material_t *mats;
tinyobj_material_t *mats = NULL;
int result = tinyobj_parse_mtl_file(&mats, &count, fileName);
if (result != TINYOBJ_SUCCESS) {
TRACELOG(LOG_WARNING, "MATERIAL: [%s] Failed to parse materials file", fileName);
@ -2566,6 +2566,12 @@ void DrawModelEx(Model model, Vector3 position, Vector3 rotationAxis, float rota
for (int i = 0; i < model.meshCount; i++)
{
// TODO: Review color + tint premultiplication mechanism
// (codifies) Ray not only does this work as expected but
// multiplying *is* definately the way to tint
// can we call it reviewed ?
// would you prefer an extra model.tint, that rlDrawMesh uses ?
Color color = model.materials[model.meshMaterial[i]].maps[MAP_DIFFUSE].color;
Color colorTint = WHITE;
@ -2942,11 +2948,15 @@ RayHitInfo GetCollisionRayGround(Ray ray, float groundHeight)
#if defined(SUPPORT_FILEFORMAT_OBJ)
// Load OBJ mesh data
// TODO used by loadOBJ, could change to a function that could handle
// data coming from a file, memory or archive...
static Model LoadOBJ(const char *fileName)
{
Model model = { 0 };
tinyobj_attrib_t attrib;
tinyobj_attrib_t attrib = { 0 };
tinyobj_shape_t *meshes = NULL;
unsigned int meshCount = 0;
@ -2968,126 +2978,112 @@ static Model LoadOBJ(const char *fileName)
if (ret != TINYOBJ_SUCCESS) TRACELOG(LOG_WARNING, "MODEL: [%s] Failed to load OBJ data", fileName);
else TRACELOG(LOG_INFO, "MODEL: [%s] OBJ data loaded successfully: %i meshes / %i materials", fileName, meshCount, materialCount);
// Init model meshes array
// TODO: Support multiple meshes... in the meantime, only one mesh is returned
//model.meshCount = meshCount;
model.meshCount = 1;
model.meshes = (Mesh *)RL_CALLOC(model.meshCount, sizeof(Mesh));
model.meshCount = materialCount;
// Init model materials array
if (materialCount > 0)
{
model.materialCount = materialCount;
model.materials = (Material *)RL_CALLOC(model.materialCount, sizeof(Material));
TraceLog(LOG_INFO, "MODEL: model has %i material meshes", materialCount);
} else {
model.meshCount = 1;
TraceLog(LOG_INFO, "MODEL: No materials, putting all meshes in a default material");
}
model.meshes = (Mesh *)RL_CALLOC(model.meshCount, sizeof(Mesh));
model.meshMaterial = (int *)RL_CALLOC(model.meshCount, sizeof(int));
/*
// Multiple meshes data reference
// NOTE: They are provided as a faces offset
typedef struct {
char *name; // group name or object name
unsigned int face_offset;
unsigned int length;
} tinyobj_shape_t;
*/
// Init model meshes
for (int m = 0; m < 1; m++)
{
Mesh mesh = { 0 };
memset(&mesh, 0, sizeof(Mesh));
mesh.vertexCount = attrib.num_faces*3;
mesh.triangleCount = attrib.num_faces;
mesh.vertices = (float *)RL_CALLOC(mesh.vertexCount*3, sizeof(float));
mesh.texcoords = (float *)RL_CALLOC(mesh.vertexCount*2, sizeof(float));
mesh.normals = (float *)RL_CALLOC(mesh.vertexCount*3, sizeof(float));
mesh.vboId = (unsigned int *)RL_CALLOC(DEFAULT_MESH_VERTEX_BUFFERS, sizeof(unsigned int));
int vCount = 0;
int vtCount = 0;
int vnCount = 0;
for (unsigned int f = 0; f < attrib.num_faces; f++)
{
// Get indices for the face
tinyobj_vertex_index_t idx0 = attrib.faces[3*f + 0];
tinyobj_vertex_index_t idx1 = attrib.faces[3*f + 1];
tinyobj_vertex_index_t idx2 = attrib.faces[3*f + 2];
// Fill vertices buffer (float) using vertex index of the face
for (int v = 0; v < 3; v++) { mesh.vertices[vCount + v] = attrib.vertices[idx0.v_idx*3 + v]; } vCount +=3;
for (int v = 0; v < 3; v++) { mesh.vertices[vCount + v] = attrib.vertices[idx1.v_idx*3 + v]; } vCount +=3;
for (int v = 0; v < 3; v++) { mesh.vertices[vCount + v] = attrib.vertices[idx2.v_idx*3 + v]; } vCount +=3;
if (attrib.num_texcoords > 0)
{
// Fill texcoords buffer (float) using vertex index of the face
// NOTE: Y-coordinate must be flipped upside-down
mesh.texcoords[vtCount + 0] = attrib.texcoords[idx0.vt_idx*2 + 0];
mesh.texcoords[vtCount + 1] = 1.0f - attrib.texcoords[idx0.vt_idx*2 + 1]; vtCount += 2;
mesh.texcoords[vtCount + 0] = attrib.texcoords[idx1.vt_idx*2 + 0];
mesh.texcoords[vtCount + 1] = 1.0f - attrib.texcoords[idx1.vt_idx*2 + 1]; vtCount += 2;
mesh.texcoords[vtCount + 0] = attrib.texcoords[idx2.vt_idx*2 + 0];
mesh.texcoords[vtCount + 1] = 1.0f - attrib.texcoords[idx2.vt_idx*2 + 1]; vtCount += 2;
}
if (attrib.num_normals > 0)
{
// Fill normals buffer (float) using vertex index of the face
for (int v = 0; v < 3; v++) { mesh.normals[vnCount + v] = attrib.normals[idx0.vn_idx*3 + v]; } vnCount +=3;
for (int v = 0; v < 3; v++) { mesh.normals[vnCount + v] = attrib.normals[idx1.vn_idx*3 + v]; } vnCount +=3;
for (int v = 0; v < 3; v++) { mesh.normals[vnCount + v] = attrib.normals[idx2.vn_idx*3 + v]; } vnCount +=3;
}
// count the faces for each material
int* matFaces = RL_CALLOC(meshCount, sizeof(int));
for (int mi=0; mi<meshCount; mi++) {
for (int fi=0; fi<meshes[mi].length; fi++) {
int idx = attrib.material_ids[meshes[mi].face_offset + fi];
if (idx == -1) idx = 0; // for no material face (which could be the whole model)
matFaces[idx]++;
}
model.meshes[m] = mesh; // Assign mesh data to model
// Assign mesh material for current mesh
model.meshMaterial[m] = attrib.material_ids[m];
// Set unfound materials to default
if (model.meshMaterial[m] == -1) model.meshMaterial[m] = 0;
}
//--------------------------------------
// create the material meshes
// running counts / indexes for each material mesh as we are
// building them at the same time
int* vCount = RL_CALLOC(model.meshCount, sizeof(int));
int* vtCount = RL_CALLOC(model.meshCount, sizeof(int));
int* vnCount = RL_CALLOC(model.meshCount, sizeof(int));
int* faceCount = RL_CALLOC(model.meshCount, sizeof(int));
// allocate space for each of the material meshes
for (int mi=0; mi<model.meshCount; mi++)
{
model.meshes[mi].vertexCount = matFaces[mi] * 3;
model.meshes[mi].triangleCount = matFaces[mi];
model.meshes[mi].vertices = (float *)RL_CALLOC(model.meshes[mi].vertexCount*3, sizeof(float));
model.meshes[mi].texcoords = (float *)RL_CALLOC(model.meshes[mi].vertexCount*2, sizeof(float));
model.meshes[mi].normals = (float *)RL_CALLOC(model.meshes[mi].vertexCount*3, sizeof(float));
model.meshes[mi].vboId = (unsigned int *)RL_CALLOC(DEFAULT_MESH_VERTEX_BUFFERS, sizeof(unsigned int));
model.meshMaterial[mi] = mi;
}
// scan through the combined sub meshes and pick out each material mesh
for (unsigned int af = 0; af < attrib.num_faces; af++)
{
int mm = attrib.material_ids[af]; // mesh material for this face
if (mm == -1) { mm = 0; } // no material object..
// Get indices for the face
tinyobj_vertex_index_t idx0 = attrib.faces[3 * af + 0];
tinyobj_vertex_index_t idx1 = attrib.faces[3 * af + 1];
tinyobj_vertex_index_t idx2 = attrib.faces[3 * af + 2];
// Fill vertices buffer (float) using vertex index of the face
for (int v = 0; v < 3; v++) { model.meshes[mm].vertices[vCount[mm] + v] = attrib.vertices[idx0.v_idx*3 + v]; } vCount[mm] +=3;
for (int v = 0; v < 3; v++) { model.meshes[mm].vertices[vCount[mm] + v] = attrib.vertices[idx1.v_idx*3 + v]; } vCount[mm] +=3;
for (int v = 0; v < 3; v++) { model.meshes[mm].vertices[vCount[mm] + v] = attrib.vertices[idx2.v_idx*3 + v]; } vCount[mm] +=3;
if (attrib.num_texcoords > 0)
{
// Fill texcoords buffer (float) using vertex index of the face
// NOTE: Y-coordinate must be flipped upside-down to account for
// raylib's upside down textures...
model.meshes[mm].texcoords[vtCount[mm] + 0] = attrib.texcoords[idx0.vt_idx*2 + 0];
model.meshes[mm].texcoords[vtCount[mm] + 1] = 1.0f - attrib.texcoords[idx0.vt_idx*2 + 1]; vtCount[mm] += 2;
model.meshes[mm].texcoords[vtCount[mm] + 0] = attrib.texcoords[idx1.vt_idx*2 + 0];
model.meshes[mm].texcoords[vtCount[mm] + 1] = 1.0f - attrib.texcoords[idx1.vt_idx*2 + 1]; vtCount[mm] += 2;
model.meshes[mm].texcoords[vtCount[mm] + 0] = attrib.texcoords[idx2.vt_idx*2 + 0];
model.meshes[mm].texcoords[vtCount[mm] + 1] = 1.0f - attrib.texcoords[idx2.vt_idx*2 + 1]; vtCount[mm] += 2;
}
if (attrib.num_normals > 0)
{
// Fill normals buffer (float) using vertex index of the face
for (int v = 0; v < 3; v++) { model.meshes[mm].normals[vnCount[mm] + v] = attrib.normals[idx0.vn_idx*3 + v]; } vnCount[mm] +=3;
for (int v = 0; v < 3; v++) { model.meshes[mm].normals[vnCount[mm] + v] = attrib.normals[idx1.vn_idx*3 + v]; } vnCount[mm] +=3;
for (int v = 0; v < 3; v++) { model.meshes[mm].normals[vnCount[mm] + v] = attrib.normals[idx2.vn_idx*3 + v]; } vnCount[mm] +=3;
}
}
// Init model materials
for (unsigned int m = 0; m < materialCount; m++)
{
{
// Init material to default
// NOTE: Uses default shader, only MAP_DIFFUSE supported
// NOTE: Uses default shader, which only supports MAP_DIFFUSE
// (codifies) TODO my lighting shader should support at least
// diffuse AND specular ...
model.materials[m] = LoadMaterialDefault();
/*
typedef struct {
char *name;
float ambient[3];
float diffuse[3];
float specular[3];
float transmittance[3];
float emission[3];
float shininess;
float ior; // index of refraction
float dissolve; // 1 == opaque; 0 == fully transparent
// illumination model (Ref: http://www.fileformat.info/format/material/)
int illum;
int pad0;
char *ambient_texname; // map_Ka
char *diffuse_texname; // map_Kd
char *specular_texname; // map_Ks
char *specular_highlight_texname; // map_Ns
char *bump_texname; // map_bump, bump
char *displacement_texname; // disp
char *alpha_texname; // map_d
} tinyobj_material_t;
*/
model.materials[m].maps[MAP_DIFFUSE].texture = GetTextureDefault(); // Get default texture, in case no texture is defined
if (materials[m].diffuse_texname != NULL) model.materials[m].maps[MAP_DIFFUSE].texture = LoadTexture(materials[m].diffuse_texname); //char *diffuse_texname; // map_Kd
if (materials[m].diffuse_texname != NULL) {
model.materials[m].maps[MAP_DIFFUSE].texture = LoadTexture(materials[m].diffuse_texname); //char *diffuse_texname; // map_Kd
} else {
model.materials[m].maps[MAP_DIFFUSE].texture = GetTextureDefault();
}
model.materials[m].maps[MAP_DIFFUSE].color = (Color){ (unsigned char)(materials[m].diffuse[0]*255.0f), (unsigned char)(materials[m].diffuse[1]*255.0f), (unsigned char)(materials[m].diffuse[2]*255.0f), 255 }; //float diffuse[3];
model.materials[m].maps[MAP_DIFFUSE].value = 0.0f;
@ -3109,6 +3105,11 @@ static Model LoadOBJ(const char *fileName)
tinyobj_materials_free(materials, materialCount);
RL_FREE(fileData);
RL_FREE(vCount);
RL_FREE(vtCount);
RL_FREE(vnCount);
RL_FREE(faceCount);
chdir(currentDir);
}