50 lines
1.5 KiB
GLSL
50 lines
1.5 KiB
GLSL
// Copyright 2017 The Servo Project Developers. See the COPYRIGHT
|
|
// file at the top-level directory of this distribution and at
|
|
// http://rust-lang.org/COPYRIGHT.
|
|
//
|
|
// 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.
|
|
|
|
#version 410
|
|
|
|
// Information about the position of each glyph in the atlas.
|
|
layout(std140) struct ImageInfo {
|
|
// The left/top/right/bottom positions of the glyph in the atlas.
|
|
uvec4 atlasRect;
|
|
// The left/top/right/bottom offsets of the glyph from point (0, 0) in glyph space.
|
|
ivec4 extents;
|
|
// The font size in pixels.
|
|
float pointSize;
|
|
}
|
|
|
|
// The size of the atlas in pixels.
|
|
uniform uvec2 uAtlasSize;
|
|
|
|
layout(std140) uniform ubImageInfo {
|
|
ImageInfo uImageInfo[256];
|
|
};
|
|
|
|
// The position of each vertex in glyph space.
|
|
in ivec2 aPosition;
|
|
|
|
// Which image the vertex belongs to.
|
|
//
|
|
// TODO(pcwalton): See if this is faster as a binary search on the vertex ID.
|
|
in uint aImageIndex;
|
|
|
|
// The vertex ID, passed along onto the TCS.
|
|
flat out uint vVertexID;
|
|
|
|
void main() {
|
|
vVertexID = gl_VertexID;
|
|
|
|
ImageInfo imageInfo = uImageInfo[aImageIndex];
|
|
vec2 glyphPos = vec2(aPosition.x - imageInfo.extents.x, imageInfo.extents.w - aPosition.y);
|
|
vec2 atlasPos = glyphPos * EMS_PER_UNIT * pointSize + vec2(imageInfo.atlasRect.xy);
|
|
gl_Position = vec4(atlasPos, 0.0f, 1.0f);
|
|
}
|
|
|