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++ // Copyright (C) 2023 The Qt Company Ltd.
++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
++
++ #include "texturesample.glsllib"
++
++ void MAIN() {
++ //glow uses larger sigma for a more rounded blur effect
++ //vec2 pix_size = INPUT_SIZE;
++ vec2 pix_size = vec2(1.0 / INPUT_SIZE.x, 1.0 / INPUT_SIZE.y);
++ //pix_size *= 0.5; //reading from larger buffer, so use more samples
++ vec4 color;
++ if (glowQualityHigh) {
++ color = SAMPLE_LOD(INPUT, INPUT_UV + vec2(0.0, 0.0) * pix_size, 0.0) * 0.152781;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(1.0, 0.0) * pix_size, 0.0) * 0.144599;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(2.0, 0.0) * pix_size, 0.0) * 0.122589;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(3.0, 0.0) * pix_size, 0.0) * 0.093095;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(4.0, 0.0) * pix_size, 0.0) * 0.063327;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(-1.0, 0.0) * pix_size, 0.0) * 0.144599;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(-2.0, 0.0) * pix_size, 0.0) * 0.122589;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(-3.0, 0.0) * pix_size, 0.0) * 0.093095;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(-4.0, 0.0) * pix_size, 0.0) * 0.063327;
++
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(0.0, 1.0) * pix_size, 0.0) * 0.152781;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(1.0, 1.0) * pix_size, 0.0) * 0.144599;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(2.0, 1.0) * pix_size, 0.0) * 0.122589;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(3.0, 1.0) * pix_size, 0.0) * 0.093095;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(4.0, 1.0) * pix_size, 0.0) * 0.063327;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(-1.0, 1.0) * pix_size, 0.0) * 0.144599;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(-2.0, 1.0) * pix_size, 0.0) * 0.122589;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(-3.0, 1.0) * pix_size, 0.0) * 0.093095;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(-4.0, 1.0) * pix_size, 0.0) * 0.063327;
++ color *= 0.5;
++ } else {
++ color = SAMPLE_LOD(INPUT, INPUT_UV + vec2(0.0, 0.0) * pix_size, 0.0) * 0.174938;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(1.0, 0.0) * pix_size, 0.0) * 0.165569;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(2.0, 0.0) * pix_size, 0.0) * 0.140367;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(3.0, 0.0) * pix_size, 0.0) * 0.106595;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(-1.0, 0.0) * pix_size, 0.0) * 0.165569;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(-2.0, 0.0) * pix_size, 0.0) * 0.140367;
++ color += SAMPLE_LOD(INPUT, INPUT_UV + vec2(-3.0, 0.0) * pix_size, 0.0) * 0.106595;
++ }
++
++ color *= glowStrength;
++
++ if (isFirstPass) {
++ color *= exposure;
++
++ float luminance = max(color.r, max(color.g, color.b));
++ float feedback = max(smoothstep(glowHDRMinimumValue, glowHDRMinimumValue + glowHDRScale, luminance), glowBloom);
++
++ color = min(color * feedback, vec4(glowHDRMaximumValue));
++ }
++ FRAGCOLOR = color;
++ }