Sprite* sprite_create(const char* texture_path) {
Sprite* sprite = malloc(sizeof(*sprite));
if(sprite == NULL) {
perror("Sprite creation");
return NULL;
}
strcpy(sprite->path, texture_path);
sprite->texture = texture_load(sprite->path);
sprite->width = texture_get_param(sprite->texture, GL_TEXTURE_WIDTH);
sprite->height = texture_get_param(sprite->texture, GL_TEXTURE_HEIGHT);
sprite->transform = m4_identity();
vec3 vertices[num_vertices];
vec3 scale = {sprite->width, sprite->height, 1};
int i;
for(i = 0; i < num_vertices; ++i) {
v3_scale(&vertices[i], &quad_vertices[i], &scale);
}
sprite->attributes[0].buffer = buffer_create(&vertices, sizeof(vertices));
sprite->attributes[0].size = 3;
sprite->attributes[1].buffer = buffer_create(&quad_uv, sizeof(quad_uv));
sprite->attributes[1].size = 2;
return sprite;
}
void m4_rot_z(t_matrix *m, double angle)
{
m4_identity(m);
m->a = cos(angle);
m->b = -sin(angle);
m->e = sin(angle);
m->f = cos(angle);
}
void m4_rot_y(t_matrix *m, double angle)
{
m4_identity(m);
m->a = cos(angle);
m->c = sin(angle);
m->i = -sin(angle);
m->k = cos(angle);
}
void m4_rot_x(t_matrix *m, double angle)
{
m4_identity(m);
m->f = cos(angle);
m->g = -sin(angle);
m->j = sin(angle);
m->k = cos(angle);
}
void m4_rotate_z(mat4_t m, scalar_t angle)
{
mat4_t rm;
m4_identity(rm);
rm[0][0] = cos(angle); rm[0][1] = -sin(angle);
rm[1][0] = sin(angle); rm[1][1] = cos(angle);
m4_mult(m, m, rm);
}
void m4_translate(mat4_t m, scalar_t x, scalar_t y, scalar_t z)
{
mat4_t tm;
m4_identity(tm);
tm[0][3] = x;
tm[1][3] = y;
tm[2][3] = z;
m4_mult(m, m, tm);
}
void m4_scale(mat4_t m, scalar_t x, scalar_t y, scalar_t z)
{
mat4_t sm;
m4_identity(sm);
sm[0][0] = x;
sm[1][1] = y;
sm[2][2] = z;
m4_mult(m, m, sm);
}
void m4_rotate_axis(mat4_t m, scalar_t angle, scalar_t x, scalar_t y, scalar_t z)
{
mat4_t xform;
scalar_t sina = sin(angle);
scalar_t cosa = cos(angle);
scalar_t one_minus_cosa = 1.0 - cosa;
scalar_t nxsq = x * x;
scalar_t nysq = y * y;
scalar_t nzsq = z * z;
m4_identity(xform);
xform[0][0] = nxsq + (1.0 - nxsq) * cosa;
xform[0][1] = x * y * one_minus_cosa - z * sina;
xform[0][2] = x * z * one_minus_cosa + y * sina;
xform[1][0] = x * y * one_minus_cosa + z * sina;
xform[1][1] = nysq + (1.0 - nysq) * cosa;
xform[1][2] = y * z * one_minus_cosa - x * sina;
xform[2][0] = x * z * one_minus_cosa - y * sina;
xform[2][1] = y * z * one_minus_cosa + x * sina;
xform[2][2] = nzsq + (1.0 - nzsq) * cosa;
m4_mult(m, m, xform);
}
