| #version 450 |
| |
| // 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/texture.glsl> |
| #include <impeller/types.glsl> |
| #include "blend_select.glsl" |
| |
| // Warning: if any of the constant values or layouts are changed in this |
| // file, then the hard-coded constant value in |
| // impeller/renderer/backend/vulkan/binding_helpers_vk.cc |
| layout(constant_id = 0) const float blend_type = 0; |
| layout(constant_id = 1) const float supports_decal = 1; |
| |
| layout(input_attachment_index = 0) uniform subpassInputMS uSub; |
| |
| vec4 ReadDestination() { |
| return (subpassLoad(uSub, 0) + subpassLoad(uSub, 1) + subpassLoad(uSub, 2) + |
| subpassLoad(uSub, 3)) / |
| vec4(4.0); |
| } |
| |
| uniform sampler2D texture_sampler_src; |
| |
| uniform FragInfo { |
| float16_t src_input_alpha; |
| } |
| frag_info; |
| |
| in vec2 v_src_texture_coords; |
| |
| out vec4 frag_color; |
| |
| vec4 Sample(sampler2D texture_sampler, vec2 texture_coords) { |
| if (supports_decal > 1) { |
| return texture(texture_sampler, texture_coords); |
| } |
| return IPSampleDecal(texture_sampler, texture_coords); |
| } |
| |
| void main() { |
| f16vec4 dst = IPHalfUnpremultiply(f16vec4(ReadDestination())); |
| f16vec4 src = IPHalfUnpremultiply( |
| f16vec4(Sample(texture_sampler_src, // sampler |
| v_src_texture_coords // texture coordinates |
| ))); |
| src.a *= frag_info.src_input_alpha; |
| |
| f16vec3 blend_result = AdvancedBlend(dst.rgb, src.rgb, int(blend_type)); |
| |
| frag_color = IPApplyBlendedColor(dst, src, blend_result); |
| } |