slang-shaders/stereoscopic-3d/shaders/shutter-to-anaglyph.slang

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#version 450
layout(push_constant) uniform Push
{
vec4 SourceSize;
vec4 OriginalSize;
vec4 OutputSize;
uint FrameCount;
float flip_eye_toggle;
float green;
float blue;
} params;
#pragma parameter flip_eye_toggle "Flip Left/Right" 0.0 0.0 1.0 1.0
bool flip_eye = bool(params.flip_eye_toggle);
#pragma parameter green "Green" 1.0 0.0 1.0 1.0
#pragma parameter blue "Blue" 1.0 0.0 1.0 1.0
const vec3 rec_709_luma = vec3(0.212, 0.701, 0.087);
layout(std140, set = 0, binding = 0) uniform UBO
{
mat4 MVP;
} global;
#pragma stage vertex
layout(location = 0) in vec4 Position;
layout(location = 1) in vec2 TexCoord;
layout(location = 0) out vec2 vTexCoord;
layout(location = 1) out float oscillator;
void main()
{
gl_Position = global.MVP * Position;
vTexCoord = TexCoord;
oscillator = float(mod(params.FrameCount, 2.));
oscillator = (flip_eye) ? oscillator : 1. - oscillator;
}
#pragma stage fragment
layout(location = 0) in vec2 vTexCoord;
layout(location = 1) in float oscillator;
layout(location = 0) out vec4 FragColor;
layout(set = 0, binding = 2) uniform sampler2D Source;
layout(set = 0, binding = 3) uniform sampler2D OriginalHistory1;
void main()
{
// convert current and previous frames to luma to preserve details
vec3 curr = texture(Source, vTexCoord).rgb;
float curr_lum = dot(curr, rec_709_luma);
vec3 last = texture(OriginalHistory1, vTexCoord).rgb;
float last_lum = dot(last, rec_709_luma);
// image for left/right eyes alternate on each frame
float one_eye = last_lum * oscillator + (curr_lum * (1. - oscillator));
float other_eye = curr_lum * oscillator + (last_lum * (1. - oscillator));
// one eye gets the red channel, the other eye goes to green and/or blue, depending on glasses
vec3 combined = vec3(one_eye, other_eye * params.green, other_eye * params.blue);
FragColor = vec4(combined, 1.0);
}