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libobs: Add planar YUV 4:2:0 reverse shader

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This allows uploading of I420 textures and directly converting on the
GPU.  Cuts down upload bandwidth to 37.5% of original rate.
This commit is contained in:
jp9000 2014-05-30 02:13:32 -07:00
parent 50adea9fd0
commit 5be241b17a
1 changed files with 50 additions and 0 deletions
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50
build/data/libobs/format_conversion.effect
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@ -30,7 +30,12 @@ uniform float width_d2;
uniform float height_d2;
uniform float width_d2_i;
uniform float height_d2_i;
uniform float input_width;
uniform float input_height;
uniform float input_width_i;
uniform float input_height_i;
uniform float input_width_i_d2;
uniform float input_height_i_d2;
uniform texture2d image;
@ -208,7 +213,43 @@ float4 PSPacked422_Reverse(VertInOut vert_in, int u_pos, int v_pos,
texel[u_pos], texel[v_pos], 1.0);
}
float GetOffsetColor(float offset)
{
float2 uv;
offset += PRECISION_OFFSET;
uv.x = floor(fmod(offset, input_width)) * input_width_i;
uv.y = floor(offset * input_width_i) * input_height_i;
uv.xy += float2(input_width_i_d2, input_height_i_d2);
return image.Sample(def_sampler, uv).r;
}
float4 PSPlanar420_Reverse(VertInOut vert_in) : TARGET
{
float x = vert_in.uv.x;
float y = vert_in.uv.y;
#ifdef _OPENGL
y = 1. - y;
#endif
float x_offset = floor(x * width + PRECISION_OFFSET);
float y_offset = floor(y * height + PRECISION_OFFSET);
float lum_offset = y_offset * width + x_offset + PRECISION_OFFSET;
lum_offset = floor(lum_offset);
float ch_offset = floor(y_offset * 0.5 + PRECISION_OFFSET) * width_d2 +
(x_offset * 0.5) + PRECISION_OFFSET;
ch_offset = floor(ch_offset);
return float4(
GetOffsetColor(lum_offset),
GetOffsetColor(u_plane_offset + ch_offset),
GetOffsetColor(v_plane_offset + ch_offset),
1.0
);
}
technique Planar420
{
@ -254,3 +295,12 @@ technique YVYU_Reverse
pixel_shader = PSPacked422_Reverse(vert_in, 3, 1, 0, 2);
}
}
technique I420_Reverse
{
pass
{
vertex_shader = VSDefault(vert_in);
pixel_shader = PSPlanar420_Reverse(vert_in);
}
}