Compositor: Add utility for nearest interpolation
This patch adds a utility function for nearest interpolation with clamped boundaries and normalized coordinates to the MemoryBuffer class. Similar to the GLSL texture() function.
This commit is contained in:
parent
20b614ab8e
commit
f6657db713
|
@ -217,6 +217,21 @@ class MemoryBuffer {
|
|||
return result;
|
||||
}
|
||||
|
||||
/* Equivalent to the GLSL texture() function with nearest interpolation and extended boundary
|
||||
* conditions. The coordinates are thus expected to have half-pixels offsets. A float4 is always
|
||||
* returned regardless of the number of channels of the buffer, the remaining channels will be
|
||||
* initialized with the template float4(0, 0, 0, 1). */
|
||||
float4 texture_nearest_extend(float2 coordinates) const
|
||||
{
|
||||
const int2 size = int2(get_width(), get_height());
|
||||
const float2 texel_coordinates = coordinates * float2(size);
|
||||
|
||||
float4 result = float4(0.0f, 0.0f, 0.0f, 1.0f);
|
||||
math::interpolate_nearest_fl(
|
||||
buffer_, result, size.x, size.y, num_channels_, texel_coordinates.x, texel_coordinates.y);
|
||||
return result;
|
||||
}
|
||||
|
||||
void read_elem_bilinear(float x, float y, float *out) const
|
||||
{
|
||||
/* Only clear past +/-1 borders to be able to smooth edges. */
|
||||
|
|
Loading…
Reference in New Issue