Misaki/SimpleRayTracing
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Add HDR files and improve light handling

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Added three binary files: `golden_gate_hills_1k.hdr`, `rogland_sunset_1k.hdr`, and `studio_small_03_1k.hdr`.
Added a new inline function `weight_nee_light` in `BSDF.h` to compute the weighted contribution of light based on the next event estimation (NEE).
Added a new function pointer type `sky_free_f` in `Light.h` for freeing sky light data.
Added a new structure `hdr_sky_data_t` in `SkyLight.h` to hold HDR sky data, including texture and intensity.
Changed the `RAY_EPSILON` definition in `Common.h` to a new value.
Changed the `light_collection_free` function in `Light.h` to include freeing sky light data if it exists.
Changed the `sky_create_hdr_sky` function in `SkyLight.h` to initialize HDR sky data and compute marginal and conditional distributions.
Changed the `texture_load` function in `Texture.h` to accept a `stride` parameter for different texture formats.
Changed the `evaluate_bsdf_directional` function in `LightEvaluation.c` to handle light intensity checks.
Changed the `evaluate_bsdf_const_sky` function in `SkyLight.c` to use a pointer for sky data and added checks for intensity.
Removed TODO comments related to handling triangle and material removal in `Triangle.h` and `Light.h`.
Removed the old `weight_sky_light` function in `SkyLight.h` and replaced it with the new `weight_nee_light` function.
Updated the `scene_setup` function in `main.c` to change camera position and light direction, and to load HDR textures.
Increased the sample count in the rendering configuration in `main.c` for better quality rendering.
This commit is contained in:
Misaki
2025-05-02 01:25:56 +09:00
parent 0061609267
commit 9a1069db90
18 changed files with 378 additions and 82 deletions
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16
source/Algorithm/PathTracing.c
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@@ -20,16 +20,20 @@ vec4s path_trace(const scene_t* scene, ray_t ray, uint32_t sample_index, uint16_
if (!closest_hit.hit)
{
vec3s sky_light = evaluate_bsdf_sky(&scene->lights, NULL, throughput, sample_index).direct_lighting;
// Set bvh to null indicate that the ray is not hit anything
light_shading_context_t light_context =
{
.wo = active_ray.direction,
.textures = &scene->textures,
};
path_output sky_output = evaluate_bsdf_sky(&scene->lights, &light_context, throughput, sample_index);
if (depth > 0)
{
// Have to multiply the weight since we evaluate the sky at each bounce
float pdf_nee = pdf_cosine_weighted_hemisphere(prev_normal, active_ray.direction);
float weight = power_heuristic(pdf_bsdf, pdf_nee);
sky_light = glms_vec3_scale(sky_light, weight);
float weight = power_heuristic(pdf_bsdf, sky_output.pdf);
sky_output.direct_lighting = glms_vec3_scale(sky_output.direct_lighting, weight);
}
accumulated_color = glms_vec4_add(accumulated_color, glms_vec4(sky_light, 0.0f));
accumulated_color = glms_vec4_add(accumulated_color, glms_vec4(sky_output.direct_lighting, 0.0f));
break;
}