Started working on a ray tracing texture mapping Sample

Uses any hit for transparency, and BDA for accessing vertex and index buffers

data/shaders/glsl/raytracingtextures/_bufferreferences.glsl

@@ -0,0 +1,7 @@
+layout(push_constant) uniform BufferReferences {
+	uint64_t vertices;
+	uint64_t indices;
+} bufferReferences;
+
+layout(buffer_reference, scalar) buffer Vertices {vec4 v[]; };
+layout(buffer_reference, scalar) buffer Indices {uint i[]; };

data/shaders/glsl/raytracingtextures/_geometrytypes.glsl

@@ -0,0 +1,32 @@
+struct Vertex
+{
+  vec3 pos;
+  vec2 uv;
+};
+
+struct Triangle {
+	Vertex vertices[3];
+	vec2 uv;
+};
+
+Triangle unpackTriangle(uint index, int vertexSize) {
+	Triangle tri;
+	const uint triIndex = index * 3;
+
+	Indices    indices     = Indices(bufferReferences.indices);
+	Vertices   vertices    = Vertices(bufferReferences.vertices);
+
+	// Unpack vertices
+	// Data is packed as vec4 so we can map to the glTF vertex structure from the host side
+	for (uint i = 0; i < 3; i++) {
+		const uint offset = indices.i[triIndex + i] * (vertexSize / 16);
+		vec4 d0 = vertices.v[offset + 0]; // pos.xyz, n.x
+		vec4 d1 = vertices.v[offset + 1]; // n.yz, uv.xy
+		tri.vertices[i].pos = d0.xyz;
+		tri.vertices[i].uv = d1.zw;
+	}
+	// Calculate values at barycentric coordinates
+	vec3 barycentricCoords = vec3(1.0f - attribs.x - attribs.y, attribs.x, attribs.y);
+	tri.uv = tri.vertices[0].uv * barycentricCoords.x + tri.vertices[1].uv * barycentricCoords.y + tri.vertices[2].uv * barycentricCoords.z;
+	return tri;
+}

data/shaders/glsl/raytracingtextures/anyhit.rahit

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+#version 460
+#extension GL_EXT_ray_tracing : require
+#extension GL_GOOGLE_include_directive : require
+#extension GL_EXT_nonuniform_qualifier : require
+#extension GL_EXT_buffer_reference2 : require
+#extension GL_EXT_scalar_block_layout : require
+#extension GL_EXT_shader_explicit_arithmetic_types_int64 : require
+
+hitAttributeEXT vec2 attribs;
+
+layout(binding = 3, set = 0) uniform sampler2D image;
+
+#include "_bufferreferences.glsl"
+#include "_geometrytypes.glsl"
+
+void main()
+{
+	Triangle tri = unpackTriangle(gl_PrimitiveID, 32);
+	vec4 color = texture(image, tri.uv);
+	if (color.a < 0.9) {
+		ignoreIntersectionEXT;
+	}
+}

data/shaders/glsl/raytracingtextures/closesthit.rchit

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+#version 460
+#extension GL_EXT_ray_tracing : require
+#extension GL_GOOGLE_include_directive : require
+#extension GL_EXT_nonuniform_qualifier : require
+#extension GL_EXT_buffer_reference2 : require
+#extension GL_EXT_scalar_block_layout : require
+#extension GL_EXT_shader_explicit_arithmetic_types_int64 : require
+
+layout(location = 0) rayPayloadInEXT vec3 hitValue;
+hitAttributeEXT vec2 attribs;
+
+#include "_bufferreferences.glsl"
+#include "_geometrytypes.glsl"
+
+void main()
+{
+	Triangle tri = unpackTriangle(gl_PrimitiveID, 32);
+	hitValue = vec3(tri.uv, 0.0f);
+	vec4 color = texture(image, tri.uv);
+	hitValue = color.rgb;
+
+}

data/shaders/glsl/raytracingtextures/miss.rmiss

@@ -0,0 +1,9 @@
+#version 460
+#extension GL_EXT_ray_tracing : enable
+
+layout(location = 0) rayPayloadInEXT vec3 hitValue;
+
+void main()
+{
+    hitValue = vec3(0.0, 0.0, 0.2);
+}

data/shaders/glsl/raytracingtextures/raygen.rgen

@@ -0,0 +1,32 @@
+#version 460
+#extension GL_EXT_ray_tracing : enable
+
+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;
+} cam;
+
+layout(location = 0) rayPayloadEXT vec3 hitValue;
+
+void main() 
+{
+	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) ;
+
+	float tmin = 0.001;
+	float tmax = 10000.0;
+
+    hitValue = vec3(0.0);
+
+    traceRayEXT(topLevelAS, gl_RayFlagsNoneEXT, 0xff, 0, 0, 0, origin.xyz, tmin, direction.xyz, tmax, 0);
+
+	imagexStore(image, ivec2(gl_LaunchIDEXT.xy), vec4(hitValue, 0.0));
+}