119 lines
3.8 KiB
Text
119 lines
3.8 KiB
Text
/*
|
|
* Copyright (c) 2019-2021, NVIDIA CORPORATION. All rights reserved.
|
|
*
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
|
* you may not use this file except in compliance with the License.
|
|
* You may obtain a copy of the License at
|
|
*
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
|
*
|
|
* Unless required by applicable law or agreed to in writing, software
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
* See the License for the specific language governing permissions and
|
|
* limitations under the License.
|
|
*
|
|
* SPDX-FileCopyrightText: Copyright (c) 2019-2021 NVIDIA CORPORATION
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#version 460
|
|
#extension GL_EXT_ray_tracing : require
|
|
#extension GL_GOOGLE_include_directive : enable
|
|
#extension GL_EXT_shader_explicit_arithmetic_types_int64 : require
|
|
|
|
#include "random.glsl"
|
|
#include "raycommon.glsl"
|
|
#include "wavefront.glsl"
|
|
|
|
// clang-format off
|
|
layout(location = 0) rayPayloadEXT hitPayload prd;
|
|
|
|
layout(set = 0, binding = eTlas) uniform accelerationStructureEXT topLevelAS;
|
|
layout(set = 0, binding = eOutImage, rgba32f) uniform image2D image;
|
|
layout(set = 1, binding = eGlobals) uniform _GlobalUniforms { GlobalUniforms uni; };
|
|
layout(push_constant) uniform _PushConstantRay { PushConstantRay pcRay; };
|
|
// clang-format on
|
|
|
|
const int NBSAMPLES = 5;
|
|
|
|
void main()
|
|
{
|
|
// Initialize the random number
|
|
uint seed = tea(gl_LaunchIDEXT.y * gl_LaunchSizeEXT.x + gl_LaunchIDEXT.x, pcRay.frame * NBSAMPLES);
|
|
prd.seed = seed;
|
|
|
|
vec3 hitValues = vec3(0);
|
|
|
|
for(int smpl = 0; smpl < NBSAMPLES; smpl++)
|
|
{
|
|
|
|
float r1 = rnd(seed);
|
|
float r2 = rnd(seed);
|
|
// Subpixel jitter: send the ray through a different position inside the pixel
|
|
// each time, to provide antialiasing.
|
|
vec2 subpixel_jitter = pcRay.frame == 0 ? vec2(0.5f, 0.5f) : vec2(r1, r2);
|
|
|
|
const vec2 pixelCenter = vec2(gl_LaunchIDEXT.xy) + subpixel_jitter;
|
|
|
|
|
|
const vec2 inUV = pixelCenter / vec2(gl_LaunchSizeEXT.xy);
|
|
vec2 d = inUV * 2.0 - 1.0;
|
|
|
|
vec4 origin = uni.viewInverse * vec4(0, 0, 0, 1);
|
|
vec4 target = uni.projInverse * vec4(d.x, d.y, 1, 1);
|
|
vec4 direction = uni.viewInverse * vec4(normalize(target.xyz), 0);
|
|
|
|
uint rayFlags = gl_RayFlagsNoneEXT;
|
|
float tMin = 0.001;
|
|
float tMax = 10000.0;
|
|
|
|
prd.done = 1;
|
|
prd.rayOrigin = origin.xyz;
|
|
prd.rayDir = direction.xyz;
|
|
prd.depth = 0;
|
|
prd.hitValue = vec3(0);
|
|
prd.attenuation = vec3(1.f, 1.f, 1.f);
|
|
|
|
for(;;)
|
|
{
|
|
traceRayEXT(topLevelAS, // acceleration structure
|
|
rayFlags, // rayFlags
|
|
0xFF, // cullMask
|
|
0, // sbtRecordOffset
|
|
0, // sbtRecordStride
|
|
0, // missIndex
|
|
origin.xyz, // ray origin
|
|
tMin, // ray min range
|
|
direction.xyz, // ray direction
|
|
tMax, // ray max range
|
|
0 // payload (location = 0)
|
|
);
|
|
|
|
|
|
hitValues += prd.hitValue * prd.attenuation;
|
|
|
|
prd.depth++;
|
|
if(prd.done == 1 || prd.depth >= 10)
|
|
break;
|
|
|
|
origin.xyz = prd.rayOrigin;
|
|
direction.xyz = prd.rayDir;
|
|
prd.done = 1; // Will stop if a reflective material isn't hit
|
|
}
|
|
}
|
|
prd.hitValue = hitValues / NBSAMPLES;
|
|
|
|
if(pcRay.frame == 0)
|
|
{
|
|
// First frame, replace the value in the buffer
|
|
imageStore(image, ivec2(gl_LaunchIDEXT.xy), vec4(prd.hitValue, 1.f));
|
|
}
|
|
else
|
|
{
|
|
// Do accumulation over time
|
|
float a = 1.0f / float(pcRay.frame + 1);
|
|
vec3 old_color = imageLoad(image, ivec2(gl_LaunchIDEXT.xy)).xyz;
|
|
imageStore(image, ivec2(gl_LaunchIDEXT.xy), vec4(mix(old_color, prd.hitValue, a), 1.f));
|
|
}
|
|
}
|