Shader copypasta

GLSL version

#version 450 core

Fragment output and vertex input

Vertex shader passes a single 2D vector with UV coordinates:

layout(location = 0) in vec2 uv;
layout(location = 0) out vec4 target;

Uniforms

• 16 pass parameters are split into four 4D vectors.
• Pass output framebuffer size is defined as screen.xy and window framebuffer size is defined as screen.zw.
• Frametime is timing.x
• Current time is timing.y

layout(binding = 0, std140) uniform params {
    vec4 param_a;
    vec4 param_b;
    vec4 param_c;
    vec4 param_d;
    vec4 screen;
    vec4 timing;
};

Samplers

"samplers": ["image", "noise"]

This will bind two samplers:

layout(binding = 0) uniform sampler2D s1; /* image */
layout(binding = 1) uniform sampler2D s2; /* noise */

Full shader template

#version 450 core

layout(location = 0) in vec2 uv;
layout(location = 0) out vec4 target;

layout(binding = 0, std140) uniform params {
    vec4 param_a;
    vec4 param_b;
    vec4 param_c;
    vec4 param_d;
    vec4 screen;
    vec4 timing;
};

void main(void)
{
    target = vec4(uv.x, uv.y, 1.0, 1.0);
}

Example: gen_checker.frag

#version 450 core

layout(location = 0) in vec2 uv;
layout(location = 0) out vec4 target;

layout(binding = 0, std140) uniform params {
    vec4 param_a;
    vec4 param_b;
    vec4 param_c;
    vec4 param_d;
    vec4 screen;
    vec4 timing;
};

void main(void)
{
    const vec2 pv = floor(screen.xy * vec2(uv.x, 1.0 - uv.y) / param_a.x);
    const float value = 1.0 - mod(pv.x + mod(pv.y, 2.0), 2.0);
    target.x = value;
    target.y = value;
    target.z = value;
    target.w = value;
}