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#define TAU 6.2831855
uniform float4x4 ViewProj;
uniform texture2d image;
uniform float2 uv_size;
uniform float period;
uniform float offset;
uniform float intensity;
sampler_state textureSampler{
Filter = Linear;
AddressU = Clamp;
AddressV = Clamp;
MinLOD = 0;
MaxLOD = 0;
};
struct VertData
{
float4 pos : POSITION;
float2 uv : TEXCOORD0;
};
VertData mainTransform(VertData v_in)
{
v_in.pos = mul(float4(v_in.pos.xyz, 1.0), ViewProj);
return v_in;
}
float4 sinImage(VertData v_in) : TARGET
{
float2 coord = v_in.uv * uv_size;
float4 color = image.Sample(textureSampler, v_in.uv);
float v = 1.0 - intensity + intensity * (1.0 + sin(TAU * (coord.y - offset) / period)) / 2.0;
return float4(color.rgb * v, color.a);
}
float4 squareImage(VertData v_in) : TARGET
{
float2 coord = v_in.uv * uv_size;
float4 color = image.Sample(textureSampler, v_in.uv);
float coord_y = fmod(coord.y - offset, period);
float step_val = step(0.25 * period, abs(coord_y)) * (1.0 - step(0.75 * period, abs(coord_y)));
float v = 1.0 - intensity + intensity * step_val;
return float4(color.rgb * v, color.a);
}
float4 smoothstepImage(VertData v_in) : TARGET
{
float2 coord = v_in.uv * uv_size;
float4 color = image.Sample(textureSampler, v_in.uv);
float coord_y = fmod(coord.y - offset, period);
float step_val = smoothstep(0.0, 0.333 * period, abs(coord_y)) * (1.0 - smoothstep(0.667 * period, period, abs(coord_y)));
float v = 1.0 - intensity + intensity * step_val;
return float4(color.rgb * v, color.a);
}
float4 triangularImage(VertData v_in) : TARGET
{
float2 coord = v_in.uv * uv_size;
float4 color = image.Sample(textureSampler, v_in.uv);
float coord_y = fmod(coord.y - offset, period);
//float s = 1.0 - step(0.5 * period, abs(coord_y));
//float m = 1.0 / (0.5 * period) * (2.0 * s - 1.0);
//float b = 2.0 * (1.0 - s);
//float step_val = m * abs(coord_y) + b;
float step_val = 2.0 * abs(abs(coord_y) / period - 0.5);
//float step_val = smoothstep(0.0, 0.333 * period, abs(coord_y)) * (1.0 - smoothstep(0.667 * period, period, abs(coord_y)));
float v = 1.0 - intensity + intensity * step_val;
return float4(color.rgb * v, color.a);
}
technique DrawSin
{
pass
{
vertex_shader = mainTransform(v_in);
pixel_shader = sinImage(v_in);
}
}
technique DrawSquare
{
pass
{
vertex_shader = mainTransform(v_in);
pixel_shader = squareImage(v_in);
}
}
technique DrawSmoothstep
{
pass
{
vertex_shader = mainTransform(v_in);
pixel_shader = smoothstepImage(v_in);
}
}
technique DrawTriangular
{
pass
{
vertex_shader = mainTransform(v_in);
pixel_shader = triangularImage(v_in);
}
}
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