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PostProcessing/FX: Alternate between two 'backbuffers'

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Saves video memory, and also fixes shaders that expect each pass's input
to be the output of the previous path without explicitly referencing the
render target.
This commit is contained in:
Stenzek 2025-04-06 16:36:52 +10:00
parent 80cfe59dbe
commit 1aabcf1ba7
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1 changed files with 28 additions and 9 deletions
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23
src/util/postprocessing_shader_fx.cpp
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@ -1161,6 +1161,11 @@ bool PostProcessing::ReShadeFXShader::CreatePasses(GPUTexture::Format backbuffer
m_textures.push_back(std::move(tex));
}
// need potentially up to two backbuffers
std::array<std::optional<TextureID>, 2> backbuffer_texture_ids;
std::optional<TextureID> read_backbuffer;
u32 current_backbuffer = 0;
for (const reshadefx::technique& tech : mod.techniques)
{
for (const reshadefx::pass& pi : tech.passes)
@ -1201,6 +1206,15 @@ bool PostProcessing::ReShadeFXShader::CreatePasses(GPUTexture::Format backbuffer
}
}
else
{
// swap to the other backbuffer, sample from the previous written
if (backbuffer_texture_ids[current_backbuffer].has_value())
{
read_backbuffer = backbuffer_texture_ids[current_backbuffer];
current_backbuffer ^= 1;
}
if (!backbuffer_texture_ids[current_backbuffer].has_value())
{
Texture new_rt;
new_rt.format = backbuffer_format;
@ -1208,10 +1222,15 @@ bool PostProcessing::ReShadeFXShader::CreatePasses(GPUTexture::Format backbuffer
new_rt.storage_access = false;
new_rt.render_target_width = 0;
new_rt.render_target_height = 0;
pass.render_targets.push_back(static_cast<TextureID>(m_textures.size()));
new_rt.reshade_name = fmt::format("| BackBuffer{} |", current_backbuffer);
backbuffer_texture_ids[current_backbuffer] = static_cast<TextureID>(m_textures.size());
m_textures.push_back(std::move(new_rt));
}
pass.render_targets.push_back(backbuffer_texture_ids[current_backbuffer].value());
}
u32 texture_slot = 0;
Assert(pi.texture_bindings.size() == pi.sampler_bindings.size());
for (size_t tb_index = 0; tb_index < pi.texture_bindings.size(); tb_index++)
@ -1232,7 +1251,7 @@ bool PostProcessing::ReShadeFXShader::CreatePasses(GPUTexture::Format backbuffer
// found the texture, now look for our side of it
if (ti.semantic == "COLOR")
{
sampler.texture_id = INPUT_COLOR_TEXTURE;
sampler.texture_id = read_backbuffer.value_or(INPUT_COLOR_TEXTURE);
break;
}
else if (ti.semantic == "DEPTH")