blob: 008d0a562e255be47c59cfbfc8cec3800050896b [file] [log] [blame]
// 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/texture.glsl>
#include <impeller/types.glsl>
uniform sampler2D texture_sampler;
uniform GradientInfo {
vec2 start_point;
vec2 end_point;
float tile_mode;
float texture_sampler_y_coord_scale;
float alpha;
vec2 half_texel;
}
gradient_info;
in vec2 v_position;
out vec4 frag_color;
void main() {
float len = length(gradient_info.end_point - gradient_info.start_point);
float dot = dot(v_position - gradient_info.start_point,
gradient_info.end_point - gradient_info.start_point);
float t = dot / (len * len);
frag_color = IPSampleLinearWithTileMode(
texture_sampler, vec2(t, 0.5),
gradient_info.texture_sampler_y_coord_scale, gradient_info.half_texel,
gradient_info.tile_mode);
frag_color =
vec4(frag_color.xyz * frag_color.a, frag_color.a) * gradient_info.alpha;
}