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#ifndef MESH_H
#define MESH_H
Vertex
vertex(V3F pos, V3F normal, V2F tex_coords)
{
Vertex result;
result.pos = pos;
result.normal = normal;
result.tex_coords = tex_coords;
return(result);
}
Mesh *
mesh_init(Arena *arena,
Vertex *vertices, U32 vertex_count,
U32 *indices, U32 index_count)
{
Mesh *mesh = 0;
U32 vbo, ebo;
if (!vertices)
{
printf("[ERROR]: Vertices is null\n");
return(mesh);
}
if (!indices)
{
printf("[ERROR]: Indices is null\n");
return(mesh);
}
Assert(arena);
mesh = arena_push_size(arena, sizeof(Mesh));
mesh->vertices = vertices;
mesh->vertex_count = vertex_count;
mesh->indices = indices;
mesh->index_count = index_count;
glGenVertexArrays(1, &mesh->vao);
glBindVertexArray(mesh->vao);
glGenBuffers(1, &vbo);
glBindBuffer(GL_ARRAY_BUFFER, vbo);
glBufferData(GL_ARRAY_BUFFER, vertex_count*sizeof(Vertex), vertices, GL_STATIC_DRAW);
glGenBuffers(1, &ebo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ebo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, index_count*sizeof(U32), indices, GL_STATIC_DRAW);
glEnableVertexAttribArray(0);
glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex),
(void *)(OffsetOfMember(Vertex, pos)));
glEnableVertexAttribArray(1);
glVertexAttribPointer(1, 3, GL_FLOAT, GL_FALSE, sizeof(Vertex),
(void *)(OffsetOfMember(Vertex, normal)));
glEnableVertexAttribArray(2);
glVertexAttribPointer(2, 2, GL_FLOAT, GL_FALSE, sizeof(Vertex),
(void *)(OffsetOfMember(Vertex, tex_coords)));
glBindVertexArray(0);
return(mesh);
}
void
mesh_draw(Mesh *mesh)
{
glBindVertexArray(mesh->vao);
glDrawElements(GL_TRIANGLES, mesh->index_count, GL_UNSIGNED_INT, 0);
glBindVertexArray(0);
}
#endif /* MESH_H */
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