| // Copyright 2013 The Flutter Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #include <impeller/gaussian.glsl> |
| #include <impeller/types.glsl> |
| |
| uniform FragInfo { |
| // shadow_color is the color supplied to DrawShadow. It will be modulated |
| // by the gaussian opacity of the shadow, computed from the coefficient |
| // in the mesh vertex data. |
| f16vec4 shadow_color; |
| } |
| frag_info; |
| |
| // v_gaussian will contain the interpolated gaussian coefficient from the |
| // mesh per-vertex data. It determines where in the gaussian curve of the |
| // umbra and penumbra we are with 0.0 representing the outermost part of |
| // the penumbra and 1.0 representing the innermost umbra. |
| in float16_t v_gaussian; |
| |
| out f16vec4 frag_color; |
| |
| // A shader that modulates the shadow color by the gaussian integral |
| // value computed from the interpolated v_gaussian coefficient. |
| void main() { |
| frag_color = |
| frag_info.shadow_color * IPHalfFractionToFastGaussianCDF(v_gaussian); |
| } |
