slang-shaders/crt/shaders/glow/threshold.slang
2016-07-21 03:01:53 +01:00

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#version 450
layout(std140, set = 0, binding = 0) uniform UBO
{
mat4 MVP;
vec4 OutputSize;
vec4 OriginalSize;
vec4 SourceSize;
} global;
#pragma stage vertex
layout(location = 0) in vec4 Position;
layout(location = 1) in vec2 TexCoord;
layout(location = 0) out vec2 vTexCoord;
void main()
{
gl_Position = global.MVP * Position;
vTexCoord = TexCoord;
}
#pragma stage fragment
layout(location = 0) in vec2 vTexCoord;
layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D Source;
#define GLOW_WHITEPOINT 1.0
#define GLOW_ROLLOFF 3.0
void main()
{
vec3 color = 1.15 * texture(Source, vTexCoord).rgb;
vec3 factor = clamp(color / GLOW_WHITEPOINT, 0.0, 1.0);
FragColor = vec4(pow(factor, vec3(GLOW_ROLLOFF)), 1.0);
}