52 lines
1.9 KiB
GLSL
52 lines
1.9 KiB
GLSL
#version 460
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#extension GL_EXT_ray_tracing : enable
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#extension GL_EXT_shader_image_load_formatted : enable
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#extension GL_EXT_shader_explicit_arithmetic_types_int16 : enable
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#extension GL_EXT_descriptor_heap : enable
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#extension GL_EXT_nonuniform_qualifier : enable
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// Specialization constant set from descriptorHeap.bufferStartElement —
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// shared with closesthit.glsl. The TLAS lives at descriptor_heap slot
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// `bufferStart` (it's an SSBO-typed entry), the per-frame output image
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// at heap slot 0.
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layout(constant_id = 0) const uint16_t bufferStart = 0us;
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layout(descriptor_heap) uniform accelerationStructureEXT topLevelAS[];
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layout(descriptor_heap) uniform writeonly image2D image[];
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layout(location = 0) rayPayloadEXT vec3 hitValue;
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void main() {
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uvec2 pixel = gl_LaunchIDEXT.xy;
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uvec2 resolution = gl_LaunchSizeEXT.xy;
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vec2 uv = (vec2(pixel) + 0.5) / vec2(resolution);
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vec2 ndc = uv * 2.0 - 1.0;
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// Camera positioned to look down the Sponza atrium axis. Sponza-OBJ
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// from McGuire's archive is roughly 30 units wide × 13 tall × 18 deep,
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// axis-aligned, with the floor near y=0 and the atrium centered on
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// origin. -X faces the long end, so we sit inside looking +X.
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vec3 origin = vec3(-10.0, 5.0, 0.0);
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float aspect = float(resolution.x) / float(resolution.y);
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float fov = radians(70.0);
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float tanHalf = tan(fov * 0.5);
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vec3 direction = normalize(vec3(
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ndc.x * aspect * tanHalf,
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-ndc.y * tanHalf,
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1.0));
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// Rotate +Z forward → +X forward (90° about Y).
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direction = vec3(direction.z, direction.y, -direction.x);
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traceRayEXT(
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topLevelAS[bufferStart],
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gl_RayFlagsNoneEXT,
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0xff,
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0, 0, 0,
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origin,
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0.001,
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direction,
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10000.0,
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0);
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imageStore(image[0], ivec2(pixel), vec4(hitValue, 1.0));
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}
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