mirror of
https://github.com/Xaymar/obs-StreamFX
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eba0a467d5
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.
25 lines
907 B
Text
25 lines
907 B
Text
#include "shared.effect"
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#include "lut.effect"
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//------------------------------------------------------------------------------
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// Uniforms
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//------------------------------------------------------------------------------
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uniform texture2d image;
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uniform texture2d lut;
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uniform int4 lut_params_0; // [size, grid_size, texture_size, 0]
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uniform float4 lut_params_1; // [inverse_size, inverse_grid_size, inverse_texture_size, half_texel]
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//------------------------------------------------------------------------------
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// Functionality
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//------------------------------------------------------------------------------
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float4 PSConsumeLUT(VertexData vtx) : TARGET {
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float4 c = image.Sample(LinearClampSampler, vtx.uv);
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return float4(sample_lut2(c.rgb, lut, lut_params_0, lut_params_1), c.a);
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};
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technique Draw {
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pass {
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vertex_shader = DefaultVertexShader(vtx);
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pixel_shader = PSConsumeLUT(vtx);
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}
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}
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