SPIRV-Cross/shaders/vulkan/rgen/payloads.nocompat.vk.rgen

#version 460
#extension GL_NV_ray_tracing : require

layout(set = 0, binding = 0, rgba8) uniform image2D image;
layout(set = 0, binding = 1) uniform accelerationStructureNV as;

struct Payload
{
	float a, b;
};

// Plain payload
layout(location = 0) rayPayloadNV float payload1;
// Struct payload
layout(location = 1) rayPayloadNV Payload payload2;

// This is syntactic sugar with the struct formulation (pretty sure), spec is kinda vague.
layout(location = 2) rayPayloadNV Block
{
	float a, b;
	Payload c, d;
};

vec4 trace_in_function()
{
	vec4 result = vec4(0.0);
	// Test that we can write to a payload in a function.
	vec3 origin = vec3(1.0, 0.0, 0.0);
	vec3 direction = vec3(0.0, 1.0, 0.0);
    traceNV(as, 0u, 255u, 0u, 1u, 0u, origin, 0.0, direction, 1000.0, 1);
	result += payload2.a;
	result += payload2.b;
	return result;
}

void main()
{
	vec3 origin = vec3(1.0, 0.0, 0.0);
	vec3 direction = vec3(0.0, 1.0, 0.0);
    traceNV(as, 0u, 255u, 0u, 1u, 0u, origin, 0.0, direction, 1000.0, 0);
	vec4 result = vec4(payload1);

	result += trace_in_function();

    traceNV(as, 0u, 255u, 0u, 1u, 0u, origin, 0.0, direction, 1000.0, 2);
	result += a + b + c.a + c.b + d.a + d.b;

	imageStore(image, ivec2(gl_LaunchIDNV.xy), result);
}