mirror of
https://github.com/barkeser2002/flower.git
synced 2026-09-25 17:56:17 +03:00
80 lines
3.2 KiB
GLSL
80 lines
3.2 KiB
GLSL
#ifndef SAMPLE_GLSL
|
|
#define SAMPLE_GLSL
|
|
|
|
/*
|
|
** Physical based render code, develop by engineer: qiutanguu.
|
|
*/
|
|
|
|
#include "Common.glsl"
|
|
|
|
// Catmull Rom 9 tap sampler.
|
|
// sTex: linear clamp sampler2D.
|
|
// uv: sample uv.
|
|
// resolution: working rt resolution.
|
|
// https://gist.github.com/TheRealMJP/c83b8c0f46b63f3a88a5986f4fa982b1
|
|
/**********************************************************************
|
|
MIT License
|
|
|
|
Copyright(c) 2019 MJP
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
of this software and associated documentation files(the "Software"), to deal
|
|
in the Software without restriction, including without limitation the rights
|
|
to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
|
|
copies of the Software, and to permit persons to whom the Software is
|
|
furnished to do so, subject to the following conditions :
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
|
|
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
SOFTWARE.
|
|
********************************************************************/
|
|
vec4 catmullRom9Sample(texture2D sTex, sampler linearClampEdge, vec2 uv, vec2 resolution)
|
|
{
|
|
vec2 samplePos = uv * resolution;
|
|
vec2 texPos1 = floor(samplePos - 0.5f) + 0.5f;
|
|
|
|
vec2 f = samplePos - texPos1;
|
|
|
|
vec2 w0 = f * (-0.5f + f * (1.0f - 0.5f * f));
|
|
vec2 w1 = 1.0f + f * f * (-2.5f + 1.5f * f);
|
|
vec2 w2 = f * (0.5f + f * (2.0f - 1.5f * f));
|
|
vec2 w3 = f * f * (-0.5f + 0.5f * f);
|
|
|
|
vec2 w12 = w1 + w2;
|
|
vec2 offset12 = w2 / (w1 + w2);
|
|
|
|
vec2 texPos0 = texPos1 - 1.0f;
|
|
vec2 texPos3 = texPos1 + 2.0f;
|
|
|
|
vec2 texPos12 = texPos1 + offset12;
|
|
|
|
texPos0 /= resolution;
|
|
texPos3 /= resolution;
|
|
texPos12 /= resolution;
|
|
|
|
vec4 result = vec4(0.0f);
|
|
|
|
result += textureLod(sampler2D(sTex, linearClampEdge), vec2(texPos0.x, texPos0.y), 0) * w0.x * w0.y;
|
|
result += textureLod(sampler2D(sTex, linearClampEdge), vec2(texPos12.x, texPos0.y), 0) * w12.x * w0.y;
|
|
result += textureLod(sampler2D(sTex, linearClampEdge), vec2(texPos3.x, texPos0.y), 0) * w3.x * w0.y;
|
|
|
|
result += textureLod(sampler2D(sTex, linearClampEdge), vec2(texPos0.x, texPos12.y), 0) * w0.x * w12.y;
|
|
result += textureLod(sampler2D(sTex, linearClampEdge), vec2(texPos12.x, texPos12.y), 0) * w12.x * w12.y;
|
|
result += textureLod(sampler2D(sTex, linearClampEdge), vec2(texPos3.x, texPos12.y), 0) * w3.x * w12.y;
|
|
|
|
result += textureLod(sampler2D(sTex, linearClampEdge), vec2(texPos0.x, texPos3.y), 0) * w0.x * w3.y;
|
|
result += textureLod(sampler2D(sTex, linearClampEdge), vec2(texPos12.x, texPos3.y), 0) * w12.x * w3.y;
|
|
result += textureLod(sampler2D(sTex, linearClampEdge), vec2(texPos3.x, texPos3.y), 0) * w3.x * w3.y;
|
|
|
|
return max(result, vec4(0.0f));
|
|
}
|
|
|
|
|
|
#endif |