From e53d2ca0d55eb1eeafe08670b5bb9c3bf718d108 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20M=C3=BCller?= <tmueller@nvidia.com>
Date: Fri, 3 Feb 2023 11:25:10 +0100
Subject: [PATCH] VR: composit background color on top of checkerboard dome
---
src/testbed.cu | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/src/testbed.cu b/src/testbed.cu
index ae5e654..34c0ccd 100644
--- a/src/testbed.cu
+++ b/src/testbed.cu
@@ -3886,6 +3886,7 @@ __global__ void spherical_checkerboard_kernel(
Vector3f parallax_shift,
Foveation foveation,
Lens lens,
+ Array4f background_color,
Array4f* frame_buffer
) {
uint32_t x = threadIdx.x + blockDim.x * blockIdx.x;
@@ -3919,8 +3920,13 @@ __global__ void spherical_checkerboard_kernel(
const Array4f light_gray = {0.55f, 0.55f, 0.55f, 1.0f};
Array4f checker = fabsf(fmodf(floorf(spherical.x()) + floorf(spherical.y()), 2.0f)) < 0.5f ? dark_gray : light_gray;
+ // Blend background color on top of checkerboard first (checkerboard is meant to be "behind" the background,
+ // representing transparency), and then blend the result behind the frame buffer.
+ background_color.head<3>() = srgb_to_linear(background_color.head<3>());
+ background_color += (1.0f - background_color.w()) * checker;
+
uint32_t idx = x + resolution.x() * y;
- frame_buffer[idx] += (1.0f - frame_buffer[idx].w()) * checker;
+ frame_buffer[idx] += (1.0f - frame_buffer[idx].w()) * background_color;
}
__global__ void vr_overlay_hands_kernel(
@@ -4237,6 +4243,7 @@ void Testbed::render_frame_epilogue(
m_parallax_shift,
foveation,
lens,
+ m_background_color,
render_buffer.frame_buffer()
);
}
--
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