draw.cpp

void DrawMesh(Gob_Mesh *mesh) {
    glVertexPointer(3, GL_FLOAT, mesh->positions.stride, GOB_BUFFER(mesh->positions.buffer)->data + mesh->positions.start);
    char *index_buffer = GOB_BUFFER(mesh->indices.buffer)->data;
    uint8_t index_size = mesh->indices.index_size;
    GLenum index_type = (index_size == 2) ? GL_UNSIGNED_SHORT : GL_UNSIGNED_INT;
    for (size_t i = 0; i < mesh->sections_count; i++) {
        glDrawElements(GL_TRIANGLES, mesh->sections[i].index_count, index_type, index_buffer + index_size * mesh->sections[i].index_start);
    }
}

void DrawNode(Gob_Node *node) {
    glPushMatrix();
    float matrix[4][4];
    ConvertTransformToMatrix(matrix, &node->transform);
    glMultMatrixf((float *)matrix);
    if (node->kind == GOB_MESH_NODE) {
        DrawMesh(GOB_MESH(node->mesh));
    }
    for (size_t i = 0; i < node->children_count; i++) {
        DrawNode(GOB_NODE(node->children[i]));
    }
    glPopMatrix();
}

void DrawScene(Gob_Scene *scene) {
    DrawNode(GOB_NODE(scene->root));
}