impeller/entity/shaders/blending/blend_select.glsl

// 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/blending.glsl>
#include <impeller/color.glsl>
#include <impeller/types.glsl>

// kScreen = 0,
// kOverlay,
// kDarken,
// kLighten,
// kColorDodge,
// kColorBurn,
// kHardLight,
// kSoftLight,
// kDifference,
// kExclusion,
// kMultiply,
// kHue,
// kSaturation,
// kColor,
// kLuminosity,
// Note, this isn't a switch as GLSL ES 1.0 does not support them.
f16vec3 AdvancedBlend(f16vec3 dst, f16vec3 src, int blend_type) {
  if (blend_type == 0) {
    return IPBlendScreen(dst, src);
  }
  if (blend_type == 1) {
    return IPBlendOverlay(dst, src);
  }
  if (blend_type == 2) {
    return IPBlendDarken(dst, src);
  }
  if (blend_type == 3) {
    return IPBlendLighten(dst, src);
  }
  if (blend_type == 4) {
    return IPBlendColorDodge(dst, src);
  }
  if (blend_type == 5) {
    return IPBlendColorBurn(dst, src);
  }
  if (blend_type == 6) {
    return IPBlendHardLight(dst, src);
  }
  if (blend_type == 7) {
    return IPBlendSoftLight(dst, src);
  }
  if (blend_type == 8) {
    return IPBlendDifference(dst, src);
  }
  if (blend_type == 9) {
    return IPBlendExclusion(dst, src);
  }
  if (blend_type == 10) {
    return IPBlendMultiply(dst, src);
  }
  if (blend_type == 11) {
    return IPBlendHue(dst, src);
  }
  if (blend_type == 12) {
    return IPBlendSaturation(dst, src);
  }
  if (blend_type == 13) {
    return IPBlendColor(dst, src);
  }
  if (blend_type == 14) {
    return IPBlendLuminosity(dst, src);
  }
  return f16vec3(0.0hf);
}