Merge branch 'gbuffers'

Author: Nelarius

CMakeLists.txt

@@ -74,8 +74,9 @@ target_link_libraries(pt-format-tool PRIVATE common fmt pt-format glm::glm)
 set(WGSL_SHADER_FILES
     reference_path_tracer.wgsl
     texture_blit.wgsl
-    hybrid_renderer_gbuffer_pass.wgsl
-    hybrid_renderer_debug_pass.wgsl)
+    deferred_renderer_gbuffer_pass.wgsl
+    deferred_renderer_debug_pass.wgsl
+    deferred_renderer_lighting_pass.wgsl)
 
 set(SHADER_SOURCE_HEADER_FILE src/pt/shader_source.hpp)
 
@@ -97,7 +98,7 @@ set(PT_SOURCE_FILES
     gpu_buffer.cpp
     gpu_context.cpp
     gui.cpp
-    hybrid_renderer.cpp
+    deferred_renderer.cpp
     reference_path_tracer.cpp
     texture_blit_renderer.cpp
     window.cpp)

src/common/extent.hpp

@@ -30,6 +30,7 @@ struct Extent2
 
 using Extent2i = Extent2<std::int32_t>;
 using Extent2u = Extent2<std::uint32_t>;
+using Extent2f = Extent2<float>;
 
 template<typename T>
 constexpr float aspectRatio(const Extent2<T>& extent) noexcept

src/pt/aligned_sky_state.hpp

@@ -0,0 +1,72 @@
+#pragma once
+
+#include <common/assert.hpp>
+#include <common/units/angle.hpp>
+
+#include <glm/glm.hpp>
+#include <hw-skymodel/hw_skymodel.h>
+
+#include <array>
+#include <cstring>
+#include <numbers>
+
+namespace nlrs
+{
+struct Sky
+{
+    float                turbidity = 1.0f;
+    std::array<float, 3> albedo = {1.0f, 1.0f, 1.0f};
+    float                sunZenithDegrees = 30.0f;
+    float                sunAzimuthDegrees = 0.0f;
+
+    bool operator==(const Sky&) const noexcept = default;
+};
+
+// A 16-byte aligned sky state for the hw-skymodel library. Matches the layout of the following WGSL
+// struct:
+//
+// struct SkyState {
+//     params: array<f32, 27>,
+//     skyRadiances: array<f32, 3>,
+//     solarRadiances: array<f32, 3>,
+//     sunDirection: vec3<f32>,
+// };
+struct AlignedSkyState
+{
+    float     params[27];        // offset: 0
+    float     skyRadiances[3];   // offset: 27
+    float     solarRadiances[3]; // offset: 30
+    float     padding1[3];       // offset: 33
+    glm::vec3 sunDirection;      // offset: 36
+    float     padding2;          // offset: 39
+
+    inline AlignedSkyState(const Sky& sky)
+        : params{0},
+          skyRadiances{0},
+          solarRadiances{0},
+          padding1{0.f, 0.f, 0.f},
+          sunDirection(0.f),
+          padding2(0.0f)
+    {
+        const float sunZenith = Angle::degrees(sky.sunZenithDegrees).asRadians();
+        const float sunAzimuth = Angle::degrees(sky.sunAzimuthDegrees).asRadians();
+
+        sunDirection = glm::normalize(glm::vec3(
+            std::sin(sunZenith) * std::cos(sunAzimuth),
+            std::cos(sunZenith),
+            -std::sin(sunZenith) * std::sin(sunAzimuth)));
+
+        const sky_params skyParams{
+            .elevation = 0.5f * std::numbers::pi_v<float> - sunZenith,
+            .turbidity = sky.turbidity,
+            .albedo = {sky.albedo[0], sky.albedo[1], sky.albedo[2]}};
+
+        sky_state skyState;
+        NLRS_ASSERT(sky_state_new(&skyParams, &skyState) == sky_state_result_success);
+
+        std::memcpy(params, skyState.params, sizeof(skyState.params));
+        std::memcpy(skyRadiances, skyState.sky_radiances, sizeof(skyState.sky_radiances));
+        std::memcpy(solarRadiances, skyState.solar_radiances, sizeof(skyState.solar_radiances));
+    }
+};
+} // namespace nlrs