9d7330ca44
Color mismatch is apparent when using source transitions, which lerps against transparent black and blends into the canvas nonlinearly. When the transition is done, the blend switches to linear, leading to a pop. Fix the issue by blending into the canvas in linear space. The lerp is still nonlinear by design.
57 lines
1.2 KiB
Plaintext
57 lines
1.2 KiB
Plaintext
uniform float4x4 ViewProj;
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uniform texture2d tex_a;
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uniform texture2d tex_b;
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uniform float2 swipe_val;
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sampler_state textureSampler {
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Filter = Linear;
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AddressU = Clamp;
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AddressV = Clamp;
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};
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struct VertData {
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float4 pos : POSITION;
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float2 uv : TEXCOORD0;
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};
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VertData VSDefault(VertData v_in)
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{
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VertData vert_out;
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vert_out.pos = mul(float4(v_in.pos.xyz, 1.0), ViewProj);
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vert_out.uv = v_in.uv;
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return vert_out;
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}
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float srgb_nonlinear_to_linear_channel(float u)
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{
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return (u <= 0.04045) ? (u / 12.92) : pow((u + 0.055) / 1.055, 2.4);
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}
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float3 srgb_nonlinear_to_linear(float3 v)
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{
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return float3(srgb_nonlinear_to_linear_channel(v.r), srgb_nonlinear_to_linear_channel(v.g), srgb_nonlinear_to_linear_channel(v.b));
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}
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float4 PSSwipe(VertData v_in) : TARGET
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{
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float2 swipe_uv = v_in.uv + swipe_val;
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float4 outc;
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outc = (swipe_uv.x - saturate(swipe_uv.x) != 0.0) ||
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(swipe_uv.y - saturate(swipe_uv.y) != 0.0)
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? tex_b.Sample(textureSampler, v_in.uv)
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: tex_a.Sample(textureSampler, swipe_uv);
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outc.rgb = srgb_nonlinear_to_linear(outc.rgb);
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return outc;
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}
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technique Swipe
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{
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pass
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{
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vertex_shader = VSDefault(v_in);
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pixel_shader = PSSwipe(v_in);
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}
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}
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