Cogl-18 ▶ Cogl ▶ graphene_matrix_transform_points

Transforms an array of input points and writes the result to another array of output points. The input points can either have 2 or 3 components each. The output points always have 3 components. The output array can simply point to the input array to do the transform in-place.

Here's an example with differing input/output strides:

typedef struct {
  float x,y;
  uint8_t r,g,b,a;
  float s,t,p;
} MyInVertex;
typedef struct {
  uint8_t r,g,b,a;
  float x,y,z;
} MyOutVertex;
MyInVertex vertices[N_VERTICES];
MyOutVertex results[N_VERTICES];
graphene_matrix_t matrix;

my_load_vertices (vertices);
my_get_matrix (&matrix);

cogl_graphene_matrix_transform_points (&matrix,
                              2,
                              sizeof (MyInVertex),
                              &vertices[0].x,
                              sizeof (MyOutVertex),
                              &results[0].x,
                              N_VERTICES);
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