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Use negative mipmap LOD bias for sub-native bilinear 3D scale

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This provides a benefit similar to FSR 1.0 (greater texture sharpness
at the cost of some graininess at sub-native resolution scales), but
without the added performance cost of FSR 1.0.
This commit is contained in:
Hugo Locurcio
2022-08-10 17:16:02 +02:00
parent cf95056c91
commit b06890c2b7
4 changed files with 8 additions and 5 deletions
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6
servers/rendering/renderer_viewport.cpp
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@@ -138,7 +138,11 @@ void RendererViewport::_configure_3d_render_buffers(Viewport *p_viewport) {
p_viewport->internal_size = Size2(render_width, render_height);
RSG::scene->render_buffers_configure(p_viewport->render_buffers, p_viewport->render_target, render_width, render_height, width, height, p_viewport->fsr_sharpness, p_viewport->texture_mipmap_bias, p_viewport->msaa, p_viewport->screen_space_aa, p_viewport->use_taa, p_viewport->use_debanding, p_viewport->get_view_count());
// At resolution scales lower than 1.0, use negative texture mipmap bias
// to compensate for the loss of sharpness.
const float texture_mipmap_bias = log2f(MIN(scaling_3d_scale, 1.0)) + p_viewport->texture_mipmap_bias;
RSG::scene->render_buffers_configure(p_viewport->render_buffers, p_viewport->render_target, render_width, render_height, width, height, p_viewport->fsr_sharpness, texture_mipmap_bias, p_viewport->msaa, p_viewport->screen_space_aa, p_viewport->use_taa, p_viewport->use_debanding, p_viewport->get_view_count());
}
}
}