project_points

Projects an array of input points and writes the result to another array of output points.

The input points can either have 2, 3 or 4 components each. The output points always have 4 components (known as homogenous coordinates) . 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];
CoglMatrix matrix;

my_load_vertices (vertices);
my_get_matrix (&matrix);

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

Parameters: