diff options
Diffstat (limited to 'source/blender/gpu/shaders/compositor/compositor_morphological_step.glsl')
-rw-r--r-- | source/blender/gpu/shaders/compositor/compositor_morphological_step.glsl | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/source/blender/gpu/shaders/compositor/compositor_morphological_step.glsl b/source/blender/gpu/shaders/compositor/compositor_morphological_step.glsl new file mode 100644 index 00000000000..6992bc2afa5 --- /dev/null +++ b/source/blender/gpu/shaders/compositor/compositor_morphological_step.glsl @@ -0,0 +1,19 @@ +#pragma BLENDER_REQUIRE(common_math_lib.glsl) +#pragma BLENDER_REQUIRE(gpu_shader_compositor_texture_utilities.glsl) + +void main() +{ + ivec2 texel = ivec2(gl_GlobalInvocationID.xy); + + /* Find the minimum/maximum value in the window of the given radius around the pixel. This is + * essentially a morphological operator with a square structuring element. The LIMIT value should + * be FLT_MAX if OPERATOR is min and FLT_MIN if OPERATOR is max. */ + float value = LIMIT; + for (int i = -radius; i <= radius; i++) { + value = OPERATOR(value, texture_load(input_tx, texel + ivec2(i, 0), vec4(LIMIT)).x); + } + + /* Write the value using the transposed texel. See the execute_step_horizontal_pass method for + * more information on the rational behind this. */ + imageStore(output_img, texel.yx, vec4(value)); +} |