| #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> |
| |
| layout(set = 0, |
| binding = 0, |
| input_attachment_index = 0) uniform subpassInput uSub; |
| |
| vec4 ReadDestination() { |
| return subpassLoad(uSub); |
| } |
| |
| 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) { |
| // gles 2.0 is the only backend without native decal support. |
| #ifdef IMPELLER_TARGET_OPENGLES |
| return IPSampleDecal(texture_sampler, texture_coords); |
| #else |
| return texture(texture_sampler, texture_coords); |
| #endif |
| } |
| |
| void main() { |
| f16vec4 dst = f16vec4(ReadDestination()); |
| f16vec4 src = f16vec4(Sample(texture_sampler_src, // sampler |
| v_src_texture_coords // texture coordinates |
| )) * |
| frag_info.src_input_alpha; |
| |
| f16vec4 blended = mix(src, f16vec4(Blend(dst.rgb, src.rgb), dst.a), dst.a); |
| frag_color = vec4(mix(dst, blended, src.a)); |
| } |