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Move paint shader functions to Paint.slh

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This commit is contained in:
Zach Pomerantz 2016-02-19 11:48:44 -08:00
parent 9daefbdb94
commit 791d295578
2 changed files with 48 additions and 26 deletions
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47
libraries/gpu/src/gpu/Paint.slh Normal file
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@ -0,0 +1,47 @@
<!
// Paint.slh
// libraries/gpu/src
//
// Created by Zach Pomerantz on 2/19/2016.
// Copyright 2016 High Fidelity, Inc.
//
// Fragment shader utility functions. Will fail compilation in vertex shaders.
//
// Distributed under the Apache License, Version 2.0.
// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
!>
<@if not GPU_PAINT_SLH@>
<@def GPU_PAINT_SLH@>
float paintStripe(float value, float offset, float scale, float edge) {
float width = fwidth(value);
float normalizedWidth = width * scale;
float x0 = (value + offset) * scale - normalizedWidth / 2;
float x1 = x0 + normalizedWidth;
float balance = 1.0 - edge;
float i0 = edge * floor(x0) + max(0.0, fract(x0) - balance);
float i1 = edge * floor(x1) + max(0.0, fract(x1) - balance);
float strip = (i1 - i0) / normalizedWidth;
return clamp(strip, 0.0, 1.0);
}
float paintGrid(vec2 value, vec2 offset, vec2 scale, vec2 edge) {
return max(
paintStripe(value.x, offset.x, scale.x, edge.x),
paintStripe(value.y, offset.y, scale.y, edge.y));
}
float paintGridMajor(vec2 value, vec2 offset, vec2 scale, vec2 edge) {
return paintGrid(value, offset, scale, edge);
}
float paintGridMajorMinor(vec2 value, vec4 offset, vec4 scale, vec4 edge) {
return max(
paintGrid(value, offset.xy, scale.xy, edge.xy),
paintGrid(value, offset.zw, scale.zw, edge.zw));
}
<@endif@>

27
libraries/render-utils/src/grid.slf
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@ -11,32 +11,7 @@
// See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//
float paintStripe(float value, float offset, float scale, float edge) {
float width = fwidth(value);
float normalizedWidth = width * scale;
float x0 = (value + offset) * scale - normalizedWidth / 2;
float x1 = x0 + normalizedWidth;
float balance = 1.0 - edge;
float i0 = edge * floor(x0) + max(0.0, fract(x0) - balance);
float i1 = edge * floor(x1) + max(0.0, fract(x1) - balance);
float strip = (i1 - i0) / normalizedWidth;
return clamp(strip, 0.0, 1.0);
}
float paintGrid(vec2 value, vec2 offset, vec2 scale, vec2 edge) {
return max(
paintStripe(value.x, offset.x, scale.x, edge.x),
paintStripe(value.y, offset.y, scale.y, edge.y));
}
float paintGridMajorMinor(vec2 value, vec4 offset, vec4 scale, vec4 edge) {
return max(
paintGrid(value, offset.xy, scale.xy, edge.xy),
paintGrid(value, offset.zw, scale.zw, edge.zw));
}
<@include gpu/Paint.slh@>
struct Grid {
vec4 period;