oglc/shader/root/rt.glsl

93 lines
2.4 KiB
GLSL

#version 430
layout(local_size_x = 1, local_size_y = 1) in; // size of local work group - 1 pixel
// gbuffer?
layout(rgba32f, binding = 2) readonly uniform image2D _g0;
layout(rgba32f, binding = 3) readonly uniform image2D _g1;
// final output
layout(rgba32f, binding = 0) uniform image2D img_output; // rgba32f defines internal format, image2d for random write to output texture
uniform vec3 _skyColor = vec3(0.68,0.85,0.9);
// TODO: some of these depend on each other!! need be be in this order for now c:
#include func.glsl
#include constants.glsl
#include time.glsl
#include sphere.glsl
#include ray.glsl
#include intersect.glsl
#include random.glsl
#include camera.glsl
#include image.glsl
// scene.glsl includes scene trace function
#include scene.glsl
#include lighting.glsl
vec3 shade(inout Ray ray, RayHit hit)
{
if (hit.distance < INF)
{
return scatterLambert(ray, hit);
}
// sky color
return _skyColor;
}
void main()
{
// base pixel colour for the image
vec4 pixel = vec4(0.0, 0.0, 0.0, 1.0);
ivec2 pixelCoords = ivec2(gl_GlobalInvocationID.xy);
ivec2 dims = imageSize(img_output);
vec2 uv = pixelUv(pixelCoords, dims);
vec4 g[2];
// load data from first pass
g[0] = imageLoad(_g0, ivec2(gl_GlobalInvocationID.xy));
float depth = g[0].w;
vec3 normal = g[0].xyz*2.0-1.0; // unpack normal packaged into texture
g[1] = imageLoad(_g1, ivec2(gl_GlobalInvocationID.xy));
vec3 albedo = g[1].xyz;
// create a ray from the uv
Ray ray = createCameraRay(uv);
RayHit firstHit;
firstHit.position = ray.origin+ray.direction*depth;
firstHit.distance = depth;
firstHit.normal = normal;
firstHit.albedo = albedo;
int sky = depth >= INF ? 1 : 0;
int bounces = (1-sky) * BOUNCES;
pixel.xyz = mix(pixel.xyz, _skyColor, sky);
// trace the rays path around the scene
for (int j = 0; j < bounces; j++)
{
RayHit hit = trace(ray);
pixel.xyz += ray.energy * shade(ray, hit);
if (length(ray.energy) < 0.001) break;
}
//pixel.xyz = mix(pixel.xyz, normal, 1.0-depth);
pixel.xyz = mix(pixel.xyz, vec3(1.0), depth);
//pixel.xyz = mix(firstHit.albedo, pixel.xyz, depth);
//pixel.a = 1.0;
//pixel.xyz = texture(_g0, uv).xyz;
// output to a specific pixel in the image
imageStore(img_output, ivec2(gl_GlobalInvocationID.xy), pixel);
}