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obs-StreamFX/source/gfx/lut/gfx-lut-consumer.cpp

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gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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// Copyright (c) 2021 Michael Fabian Dirks <info@xaymar.com>
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include "gfx-lut-consumer.hpp"
#include "obs/gs/gs-helper.hpp"
gfx: Apply coding guidelines
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streamfx::gfx::lut::consumer::consumer()
gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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{
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_data = streamfx::gfx::lut::data::instance();
gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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if (!_data->consumer_effect())
throw std::runtime_error("Unable to get LUT consumer effect.");
}
gfx: Apply coding guidelines
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streamfx::gfx::lut::consumer::~consumer() {}
gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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gfx: Apply coding guidelines
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std::shared_ptr<streamfx::obs::gs::effect>
streamfx::gfx::lut::consumer::prepare(streamfx::gfx::lut::color_depth depth,
std::shared_ptr<streamfx::obs::gs::texture> lut)
gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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{
obs/gs: Apply coding guidelines
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auto gctx = streamfx::obs::gs::context();
gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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auto effect = _data->consumer_effect();
int32_t idepth = static_cast<int32_t>(depth);
int32_t size = static_cast<int32_t>(pow(2l, idepth));
int32_t grid_size = static_cast<int32_t>(pow(2l, (idepth / 2)));
int32_t container_size = static_cast<int32_t>(pow(2l, (idepth + (idepth / 2))));
obs/gs: Apply coding guidelines
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if (streamfx::obs::gs::effect_parameter efp = effect->get_parameter("lut_params_0"); efp) {
gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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efp.set_int4(size, grid_size, container_size, 0l);
}
obs/gs: Apply coding guidelines
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if (streamfx::obs::gs::effect_parameter efp = effect->get_parameter("lut_params_1"); efp) {
gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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float inverse_size = 1.f / static_cast<float>(size);
float inverse_z_size = 1.f / static_cast<float>(grid_size);
float inverse_container_size = 1.f / static_cast<float>(container_size);
float half_texel = inverse_container_size / 2.f;
efp.set_float4(inverse_size, inverse_z_size, inverse_container_size, half_texel);
}
obs/gs: Apply coding guidelines
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if (streamfx::obs::gs::effect_parameter efp = effect->get_parameter("lut"); efp) {
gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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efp.set_texture(lut);
}
return effect;
}
gfx: Apply coding guidelines
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void streamfx::gfx::lut::consumer::consume(streamfx::gfx::lut::color_depth depth,
std::shared_ptr<streamfx::obs::gs::texture> lut,
std::shared_ptr<streamfx::obs::gs::texture> texture)
gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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{
obs/gs: Apply coding guidelines
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auto gctx = streamfx::obs::gs::context();
gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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auto effect = prepare(depth, lut);
obs/gs: Apply coding guidelines
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if (streamfx::obs::gs::effect_parameter efp = effect->get_parameter("image"); efp) {
gfx/lut: Add a simple but efficient LUT producer and consumer For simple image and video editing, LUTs (Look-Up Tables) are vastly superior to running the entire editing operation on each pixel - especially if all the processing can be done inside a single shader. Due to the post-processing requirements for our LUTs, we are limited to 8 bits per channel - though clever use of the unused Alpha channel may result in additional space. For our purposes however, this is definitely enough.
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efp.set_texture(texture->get_object());
}
// Draw a simple quad.
while (gs_effect_loop(effect->get_object(), "Draw")) {
gs_draw_sprite(nullptr, 0, 1, 1);
}
}
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