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#version 310 es
// SPDX-License-Identifier: Unlicense OR MIT
#extension GL_GOOGLE_include_directive : enable
precision highp float;
#include "common.h"
layout(push_constant) uniform Block {
vec4 transform;
vec2 pathOffset;
} _block;
layout(location=0) in float corner;
layout(location=1) in float maxy;
layout(location=2) in vec2 from;
layout(location=3) in vec2 ctrl;
layout(location=4) in vec2 to;
layout(location=0) out vec2 vFrom;
layout(location=1) out vec2 vCtrl;
layout(location=2) out vec2 vTo;
void main() {
// Add a one pixel overlap so curve quads cover their
// entire curves. Could use conservative rasterization
// if available.
vec2 from = from + _block.pathOffset;
vec2 ctrl = ctrl + _block.pathOffset;
vec2 to = to + _block.pathOffset;
float maxy = maxy + _block.pathOffset.y;
vec2 pos;
float c = corner;
if (c >= 0.375) {
// North.
c -= 0.5;
pos.y = maxy + 1.0;
} else {
// South.
pos.y = min(min(from.y, ctrl.y), to.y) - 1.0;
}
if (c >= 0.125) {
// East.
pos.x = max(max(from.x, ctrl.x), to.x)+1.0;
} else {
// West.
pos.x = min(min(from.x, ctrl.x), to.x)-1.0;
}
vFrom = from-pos;
vCtrl = ctrl-pos;
vTo = to-pos;
pos = pos*_block.transform.xy + _block.transform.zw;
gl_Position = vec4(transform3x2(fboTransform, vec3(pos, 0)), 1);
}
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