78 lines
2.3 KiB
Text
78 lines
2.3 KiB
Text
|
/* Copyright (c) 2023, Sascha Willems
|
||
|
|
*
|
||
|
|
* SPDX-License-Identifier: MIT
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
|
||
|
|
#version 460
|
||
|
|
#extension GL_EXT_ray_tracing : enable
|
||
|
|
#extension GL_GOOGLE_include_directive : require
|
||
|
|
|
||
|
|
layout(binding = 0, set = 0) uniform accelerationStructureEXT topLevelAS;
|
||
|
|
layout(binding = 1, set = 0, rgba8) uniform image2D image;
|
||
|
|
layout(binding = 2, set = 0) uniform CameraProperties
|
||
|
|
{
|
||
|
|
mat4 viewInverse;
|
||
|
|
mat4 projInverse;
|
||
|
|
uint frame;
|
||
|
|
} cam;
|
||
|
|
|
||
|
|
layout(location = 0) rayPayloadEXT vec3 hitValue;
|
||
|
|
layout(location = 3) rayPayloadEXT uint payloadSeed;
|
||
|
|
|
||
|
|
#include "random.glsl"
|
||
|
|
|
||
|
|
void main()
|
||
|
|
{
|
||
|
|
uint seed = tea(gl_LaunchIDEXT.y * gl_LaunchSizeEXT.x + gl_LaunchIDEXT.x, cam.frame);
|
||
|
|
|
||
|
|
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 = cam.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;
|
||
|
|
|
||
|
|
// const vec2 pixelCenter = vec2(gl_LaunchIDEXT.xy) + vec2(0.5);
|
||
|
|
// const vec2 inUV = pixelCenter/vec2(gl_LaunchSizeEXT.xy);
|
||
|
|
// vec2 d = inUV * 2.0 - 1.0;
|
||
|
|
|
||
|
|
vec4 origin = cam.viewInverse * vec4(0,0,0,1);
|
||
|
|
vec4 target = cam.projInverse * vec4(d.x, d.y, 1, 1) ;
|
||
|
|
vec4 direction = cam.viewInverse*vec4(normalize(target.xyz), 0.0) ;
|
||
|
|
|
||
|
|
float tmin = 0.001;
|
||
|
|
float tmax = 10000.0;
|
||
|
|
|
||
|
|
hitValue = vec3(0.0);
|
||
|
|
vec3 hitValues = vec3(0);
|
||
|
|
|
||
|
|
const int samples = 4;
|
||
|
|
|
||
|
|
// Trace multiple rays for e.g. transparency
|
||
|
|
for(int smpl = 0; smpl < samples; smpl++) {
|
||
|
|
payloadSeed = tea(gl_LaunchIDEXT.y * gl_LaunchSizeEXT.x + gl_LaunchIDEXT.x, cam.frame);
|
||
|
|
traceRayEXT(topLevelAS, gl_RayFlagsNoneEXT, 0xff, 0, 0, 0, origin.xyz, tmin, direction.xyz, tmax, 0);
|
||
|
|
hitValues += hitValue;
|
||
|
|
}
|
||
|
|
|
||
|
|
// imageStore(image, ivec2(gl_LaunchIDEXT.xy), vec4(hitValues / float(samples), 0.0));
|
||
|
|
|
||
|
|
vec3 hitVal = hitValues / float(samples);
|
||
|
|
|
||
|
|
if(cam.frame > 0)
|
||
|
|
{
|
||
|
|
float a = 1.0f / float(cam.frame + 1);
|
||
|
|
vec3 old_color = imageLoad(image, ivec2(gl_LaunchIDEXT.xy)).xyz;
|
||
|
|
imageStore(image, ivec2(gl_LaunchIDEXT.xy), vec4(mix(old_color, hitVal, a), 1.f));
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
// First frame, replace the value in the buffer
|
||
|
|
imageStore(image, ivec2(gl_LaunchIDEXT.xy), vec4(hitVal, 1.f));
|
||
|
|
}
|
||
|
|
}
|