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// Copyright (C) 2023 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
VARYING vec2 vTexCoord;
VARYING vec4 vColor;
VARYING vec3 vViewDir;
float fresnel = 1.0;
vec4 rainTex = vec4(1.0);
vec3 blend_rnm(vec3 n1, vec3 n2)
{
vec3 t = n1.xyz * vec3( 2, 2, 2) + vec3(-1, -1, 0);
vec3 u = n2.xyz * vec3(-2, -2, 2) + vec3( 1, 1, -1);
vec3 r = t * dot(t, u) - u * t.z;
return normalize(r);
}
void MAIN()
{
rainTex = texture(rainmap, UV0 * 1.0);
fresnel = abs(dot(normalize(vViewDir), normalize(VAR_WORLD_NORMAL)));
fresnel *= 1.0 - abs(VAR_WORLD_NORMAL.y);
BASE_COLOR = vec4(0.0);
SPECULAR_AMOUNT = 1.0;
ROUGHNESS = 0.250;
METALNESS = 0.0;
NORMAL = blend_rnm(normalize(VAR_WORLD_NORMAL) * 0.5 + 0.5, rainTex.xyz);
rainTex.rgb = rainTex.rgb * 2.0 - 1.0;
}
void POST_PROCESS()
{
float a = rainTex.a * vColor.a * fresnel;
if (a <= 0.0)
discard;
vec2 centerCoord = vTexCoord * 2.0 - 1.0;
float centerDist = smoothstep(1.0, 0.0, length(rainTex.rg));
vec2 screenPos = gl_FragCoord.xy / textureSize(SCREEN_TEXTURE, 0);
vec2 screenCoord = vec2(screenPos);
float distortion = 1. * centerDist;
screenCoord.x = centerCoord.x > 0.0 ? mix(screenCoord.x, 0.0, centerCoord.x*distortion) : mix(screenCoord.x, 1.0, -centerCoord.x * distortion);
screenCoord.y = centerCoord.y > 0.0 ? mix(screenCoord.y, 0.0, centerCoord.y*distortion) : mix(screenCoord.y, 1.0, -centerCoord.y * distortion);
float depthSample = texture(DEPTH_TEXTURE, screenCoord).x;
vec4 sceneSample = texture(SCREEN_TEXTURE, screenCoord);
vec3 fColor = sceneSample.rgb * (1.0 + centerDist);
COLOR_SUM = vec4((DIFFUSE.rgb + SPECULAR + fColor), a);
}