64 lines
1.7 KiB
GLSL
64 lines
1.7 KiB
GLSL
#version 450
|
|
|
|
// pathfinder/shaders/fill.vs.glsl
|
|
//
|
|
// Copyright © 2019 The Pathfinder Project Developers.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
|
// option. This file may not be copied, modified, or distributed
|
|
// except according to those terms.
|
|
|
|
precision highp float;
|
|
precision highp sampler2D;
|
|
|
|
layout(set=0, binding=0) uniform uFramebufferSize {
|
|
vec2 framebufferSize;
|
|
};
|
|
layout(set=0, binding=1) uniform uTileSize {
|
|
vec2 tileSize;
|
|
};
|
|
|
|
in uvec2 aTessCoord;
|
|
in uint aFromPx;
|
|
in uint aToPx;
|
|
in vec2 aFromSubpx;
|
|
in vec2 aToSubpx;
|
|
in uint aTileIndex;
|
|
|
|
out vec2 vFrom;
|
|
out vec2 vTo;
|
|
|
|
vec2 computeTileOffset(uint tileIndex, float stencilTextureWidth) {
|
|
uint tilesPerRow = uint(stencilTextureWidth / tileSize.x);
|
|
uvec2 tileOffset = uvec2(tileIndex % tilesPerRow, tileIndex / tilesPerRow);
|
|
return vec2(tileOffset) * tileSize;
|
|
}
|
|
|
|
void main() {
|
|
vec2 tileOrigin = computeTileOffset(aTileIndex, framebufferSize.x);
|
|
|
|
vec2 from = vec2(aFromPx & 15u, aFromPx >> 4u) + aFromSubpx;
|
|
vec2 to = vec2(aToPx & 15u, aToPx >> 4u) + aToSubpx;
|
|
|
|
vec2 position;
|
|
if (aTessCoord.x == 0u)
|
|
position.x = floor(min(from.x, to.x));
|
|
else
|
|
position.x = ceil(max(from.x, to.x));
|
|
if (aTessCoord.y == 0u)
|
|
position.y = floor(min(from.y, to.y));
|
|
else
|
|
position.y = tileSize.y;
|
|
|
|
vFrom = from - position;
|
|
vTo = to - position;
|
|
|
|
vec2 globalPosition = (tileOrigin + position) / framebufferSize * 2.0 - 1.0;
|
|
#ifdef PF_ORIGIN_UPPER_LEFT
|
|
globalPosition.y = -globalPosition.y;
|
|
#endif
|
|
gl_Position = vec4(globalPosition, 0.0, 1.0);
|
|
}
|