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Vertex init_vert(V3 pos, V2 texc)
{
Vertex v = {
.pos = pos,
.texc = texc,
};
return v;
}
void init_mesh_buffers(Mesh *mesh)
{
ASSERT(mesh->verts);
ASSERT(mesh->nverts > 0);
U32 sverts,
sindices;
sverts = mesh->nverts*sizeof(Vertex);
sindices = mesh->nindices*sizeof(U32);
glGenVertexArrays(1, &mesh->vao);
glBindVertexArray(mesh->vao);
glGenBuffers(1, &mesh->vbo);
glBindBuffer(GL_ARRAY_BUFFER, mesh->vbo);
glBufferData(GL_ARRAY_BUFFER, sverts,
mesh->verts, GL_STATIC_DRAW);
if (mesh->indices && (mesh->nindices > 0)) {
glGenBuffers(1, &mesh->ebo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, mesh->ebo);
glBufferData(GL_ELEMENT_ARRAY_BUFFER, sindices,
mesh->indices, GL_STATIC_DRAW);
}
glEnableVertexAttribArray(PRGE_SHADER_POS_LOC);
glVertexAttribPointer(PRGE_SHADER_POS_LOC, 3,
GL_FLOAT, GL_FALSE, sizeof(Vertex),
(void *)OFFSETOF(Vertex, pos));
glEnableVertexAttribArray(PRGE_SHADER_TEXC_LOC);
glVertexAttribPointer(PRGE_SHADER_TEXC_LOC, 2,
GL_FLOAT, GL_FALSE, sizeof(Vertex),
(void *)OFFSETOF(Vertex, texc));
glBindVertexArray(0);
}
Mesh init_mesh(V3 origin, V3 rotate, S32 nverts, Vertex *verts, S32 nindices, U32 *indices)
{
Mesh mesh;
MEM0STRUCT(&mesh);
mesh.origin = origin;
mesh.rotate = rotate;
mesh.verts = verts;
mesh.nverts = nverts;
mesh.indices = indices;
mesh.nindices = nindices;
init_mesh_buffers(&mesh);
return mesh;
}
void clear_mesh(Mesh *mesh)
{
glBindVertexArray(mesh->vao);
glDisableVertexAttribArray(PRGE_SHADER_POS_LOC);
glBindVertexArray(0);
glDeleteVertexArrays(1, &mesh->vao);
glBindBuffer(GL_ARRAY_BUFFER, 0);
glDeleteBuffers(1, &mesh->vbo);
glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0);
glDeleteBuffers(1, &mesh->ebo);
}
void add_mesh_texture(Mesh *mesh, Texture texture)
{
if (mesh->ntextures+1 >= PRGE_MAX_TEXTURES) {
sys_printf("[WARNING] : Texture : \"%s\" : limit\n", texture.name);
return;
}
mesh->textures[mesh->ntextures++] = texture;
}
Mesh gen_quad(Arena *arena, V3 origin, V3 rotate, F32 w, F32 h)
{
Mesh mesh;
S32 nverts;
Vertex *verts;
S32 nindices;
U32 *indices;
ASSERT(w > 0);
ASSERT(h > 0);
nverts = 4;
verts = push_arena(arena, nverts*sizeof(Vertex));
verts[0] = init_vert(v3(-w/2.0f, -h/2.0f, 0.0f), v2(0.0f, 0.0f));
verts[1] = init_vert(v3(-w/2.0f, h/2.0f, 0.0f), v2(0.0f, h));
verts[2] = init_vert(v3(w/2.0f, -h/2.0f, 0.0f), v2(w, 0.0f));
verts[3] = init_vert(v3(w/2.0f, h/2.0f, 0.0f), v2(w, h));
nindices = 6;
indices = push_arena(arena, nindices*sizeof(U32));
indices[0] = 0;
indices[1] = 1;
indices[2] = 3;
indices[3] = 0;
indices[4] = 2;
indices[5] = 3;
mesh = init_mesh(origin, rotate, nverts, verts, nindices, indices);
return mesh;
}
Mesh gen_circle(Arena *arena, V3 origin, V3 rotate, F32 r, S32 nverts)
{
Mesh mesh;
Vertex *verts;
S32 nindices;
U32 *indices;
F32 angle, dangle;
S32 i, vi;
if (nverts < 3)
nverts = 3;
verts = push_arena(arena, nverts*sizeof(Vertex));
dangle = 2*F32PI/(F32)nverts;
for (i = 0, angle = 0.0f; i < nverts; i++, angle += dangle)
verts[i] = init_vert(v3(f32cos(angle)*r, f32sin(angle)*r, 0.0f), V2_ZERO);
nindices = nverts*3;
indices = push_arena(arena, nindices*sizeof(U32));
for (i = 0, vi = 1; i < nindices; i += 3, vi++) {
indices[i] = 0;
indices[i+1] = vi;
indices[i+2] = (((vi+1) == (nverts)) ? 1 : (vi+1));
}
mesh = init_mesh(origin, rotate, nverts, verts, nindices, indices);
return mesh;
}
Model init_model(V3 origin, V3 rotate, S32 nmeshes, Mesh *meshes)
{
Model model = {
.origin = origin,
.rotate = rotate,
.nmeshes = nmeshes,
.meshes = meshes,
};
return model;
}
Model load_model(V3 origin, V3 rotate, const char *fname)
{
Model model;
MEM0STRUCT(&model);
model.origin = origin;
model.rotate = rotate;
sys_printf("[INFO] : PRGE : Trying to load %s\n", fname);
/* TODO(pryazha): Load models with assimp? */
return model;
}
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