Add support for 8 bit normals

src/rmodels.c

@@ -5680,6 +5680,54 @@ static Model LoadGLTF(const char *fileName)
                                     normals[3 * k + 2] = nt.z;
                                 }
                             }
+                            else if ((attribute->type == cgltf_type_vec3) && (attribute->component_type == cgltf_component_type_r_8u))
+                            {
+                                // Init raylib mesh normals to copy glTF attribute data
+                                model.meshes[meshIndex].normals = (float*)RL_MALLOC(attribute->count * 3 * sizeof(float));
+
+                                // Load data into a temp buffer to be converted to raylib data type
+                                unsigned char* temp = (unsigned char*)RL_MALLOC(attribute->count * 3 * sizeof(unsigned char));
+                                LOAD_ATTRIBUTE(attribute, 3, unsigned char, temp);
+
+                                // Convert data to raylib normal data type (float)
+                                for (unsigned int t = 0; t < attribute->count * 3; t++) model.meshes[meshIndex].normals[t] = (float)temp[t];
+
+                                RL_FREE(temp);
+
+                                // Transform the normals
+                                float* normals = model.meshes[meshIndex].normals;
+                                for (unsigned int k = 0; k < attribute->count; k++)
+                                {
+                                    Vector3 nt = Vector3Normalize(Vector3Transform((Vector3) { normals[3 * k], normals[3 * k + 1], normals[3 * k + 2] }, worldMatrixNormals));
+                                    normals[3 * k] = nt.x;
+                                    normals[3 * k + 1] = nt.y;
+                                    normals[3 * k + 2] = nt.z;
+                                }
+                            }
+                            else if ((attribute->type == cgltf_type_vec3) && (attribute->component_type == cgltf_component_type_r_8))
+                            {
+                                // Init raylib mesh normals to copy glTF attribute data
+                                model.meshes[meshIndex].normals = (float*)RL_MALLOC(attribute->count * 3 * sizeof(float));
+
+                                // Load data into a temp buffer to be converted to raylib data type
+                                char* temp = (char*)RL_MALLOC(attribute->count * 3 * sizeof(char));
+                                LOAD_ATTRIBUTE(attribute, 3, char, temp);
+
+                                // Convert data to raylib normal data type (float)
+                                for (unsigned int t = 0; t < attribute->count * 3; t++) model.meshes[meshIndex].normals[t] = (float)temp[t];
+
+                                RL_FREE(temp);
+
+                                // Transform the normals
+                                float* normals = model.meshes[meshIndex].normals;
+                                for (unsigned int k = 0; k < attribute->count; k++)
+                                {
+                                    Vector3 nt = Vector3Normalize(Vector3Transform((Vector3) { normals[3 * k], normals[3 * k + 1], normals[3 * k + 2] }, worldMatrixNormals));
+                                    normals[3 * k] = nt.x;
+                                    normals[3 * k + 1] = nt.y;
+                                    normals[3 * k + 2] = nt.z;
+                                }
+                            }
                             else TRACELOG(LOG_WARNING, "MODEL: [%s] Normals attribute data format not supported, use vec3 float", fileName);
                         }
                     }