97 lines
3.8 KiB
C++
97 lines
3.8 KiB
C++
#include <vector>
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#include "Mesh.h"
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#include "../lib/loaders/tinyobj.h"
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Mesh createMesh(const char* obj_file) {
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Scratch temp = scratchStart(0, 0);
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Mesh result = {0};
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tinyobj::ObjReader reader = tinyobj::ObjReader();
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bool success = reader.ParseFromFile(obj_file);
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log("%s\n", reader.Error().c_str());
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const tinyobj::attrib_t attrib = reader.GetAttrib();
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std::vector<tinyobj::index_t> indices_t = reader.GetShapes().at(0).mesh.indices;
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list<uint32> indices = PushFullList(temp.arena, uint32, indices_t.size());
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list<real32> vertices = PushFullList(temp.arena, real32, 3*indices_t.size());
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list<real32> normals = PushFullList(temp.arena, real32, 3*indices_t.size());
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list<real32> texcoords = PushFullList(temp.arena, real32, 2*indices_t.size());
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for (int i = 0; i < indices_t.size(); i++) {
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tinyobj::index_t vertex_data = indices_t[i];
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vertices.data[3*i] = attrib.vertices[3*vertex_data.vertex_index];
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vertices.data[3*i+1] = attrib.vertices[3*vertex_data.vertex_index + 1];
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vertices.data[3*i+2] = attrib.vertices[3*vertex_data.vertex_index + 2];
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normals.data[3*i] = attrib.normals[3*vertex_data.normal_index];
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normals.data[3*i+1] = attrib.normals[3*vertex_data.normal_index + 1];
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normals.data[3*i+2] = attrib.normals[3*vertex_data.normal_index + 2];
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texcoords.data[2*i] = attrib.texcoords[2*vertex_data.texcoord_index];
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texcoords.data[2*i+1] = attrib.texcoords[2*vertex_data.texcoord_index + 1];
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indices.data[i] = i;
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}
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result.num_indices = indices_t.size();
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glGenVertexArrays(1, &result.vao);
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glGenBuffers(1, &result.vbo_xyz);
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glGenBuffers(1, &result.vbo_uv);
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glGenBuffers(1, &result.vbo_norm);
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//glGenBuffers(1, &ebo);
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glBindVertexArray(result.vao);
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glBindBuffer(GL_ARRAY_BUFFER, result.vbo_xyz);
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glBufferData(GL_ARRAY_BUFFER, vertices.length * sizeof(float), vertices.data, GL_STATIC_DRAW);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(0);
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glBindBuffer(GL_ARRAY_BUFFER, result.vbo_uv);
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glBufferData(GL_ARRAY_BUFFER, texcoords.length * sizeof(float), texcoords.data, GL_STATIC_DRAW);
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(1);
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glBindBuffer(GL_ARRAY_BUFFER, result.vbo_norm);
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glBufferData(GL_ARRAY_BUFFER, normals.length * sizeof(float), normals.data, GL_STATIC_DRAW);
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glVertexAttribPointer(2, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(2);
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//glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
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//glBufferData(GL_ELEMENT_ARRAY_BUFFER, indices.size() * sizeof(unsigned int), indices.data(), GL_STATIC_DRAW);
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scratchEnd(temp);
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return result;
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}
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Mesh createMesh(const Shape* shape) {
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Mesh result = {0};
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result.num_indices = shape->indices_size;
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glGenVertexArrays(1, &result.vao);
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glGenBuffers(1, &result.vbo_xyz);
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glGenBuffers(1, &result.vbo_uv);
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glGenBuffers(1, &result.ebo);
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glBindVertexArray(result.vao);
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glBindBuffer(GL_ARRAY_BUFFER, result.vbo_xyz);
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glBufferData(GL_ARRAY_BUFFER, shape->xyz_size * sizeof(float), shape->xyz, GL_STATIC_DRAW);
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glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, 3 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(0);
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glBindBuffer(GL_ARRAY_BUFFER, result.vbo_uv);
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glBufferData(GL_ARRAY_BUFFER, shape->uv_size * sizeof(float), shape->uv, GL_STATIC_DRAW);
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glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, 2 * sizeof(float), (void*)0);
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glEnableVertexAttribArray(1);
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glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, result.ebo);
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glBufferData(GL_ELEMENT_ARRAY_BUFFER, shape->indices_size * sizeof(unsigned int), shape->indices, GL_STATIC_DRAW);
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return result;
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}
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