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// Copyright (C) 2024 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#version 440
#extension GL_GOOGLE_include_directive : enable
#include "../effectlib/tonemapping.glsllib"
#include "../effectlib/oitcommon.glsllib"
layout(location = 0) out vec4 fragOutput;
layout(location = 0) in vec2 uv_coord;
#if QSHADER_VIEW_COUNT >= 2
layout(location = 1) flat in uint v_viewIndex;
#endif
#if QSSG_OIT_METHOD == QSSG_OIT_WEIGHTED_BLENDED
#if QSHADER_VIEW_COUNT >= 2
# ifdef QSSG_MULTISAMPLE
# define samplerType sampler2DMSArray
# else
# define samplerType sampler2DArray
# endif
#else
# ifdef QSSG_MULTISAMPLE
# define samplerType sampler2DMS
# else
# define samplerType sampler2D
# endif
#endif
layout(binding = 1) uniform samplerType accumTexture;
layout(binding = 2) uniform samplerType revealageTexture;
void main()
{
#if QSHADER_HLSL || QSHADER_MSL
vec2 uv = vec2(uv_coord.x, 1.0 - uv_coord.y);
#else
vec2 uv = uv_coord;
#endif
#if QSHADER_VIEW_COUNT >= 2
#ifdef QSSG_MULTISAMPLE
ivec2 iuv = ivec2(uv * textureSize(accumTexture).xy);
vec4 accum = texelFetch(accumTexture, ivec3(iuv, v_viewIndex), gl_SampleID);
float a = 1.0 - texelFetch(revealageTexture, ivec3(iuv, v_viewIndex), gl_SampleID).r;
#else
vec4 accum = texture(accumTexture, vec3(uv, v_viewIndex));
float a = 1.0 - texture(revealageTexture, vec3(uv, v_viewIndex)).r;
#endif
#else
#ifdef QSSG_MULTISAMPLE
ivec2 iuv = ivec2(uv * textureSize(accumTexture));
vec4 accum = texelFetch(accumTexture, iuv, gl_SampleID);
float a = 1.0 - texelFetch(revealageTexture, iuv, gl_SampleID).r;
#else
vec4 accum = texture(accumTexture, uv);
float a = 1.0 - texture(revealageTexture, uv).r;
#endif
#endif
vec4 color = vec4(accum.rgb / clamp(accum.a, 1e-4, 5e6), a);
fragOutput = vec4(color);
}
#endif // QSSG_OIT_WEIGHTED_BLENDED
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