forked from joejulian/gio
Elias Naur
ac7029fa24
We're about to add Direct3D support, where shaders are written in HLSL. Rather than write shaders twice (or more), convert them to a GLSL variant understood by the glslcc cross-compiler and generate the OpenGL ES 2.0 and HLSL variants. The HLSL is used by a future change. Signed-off-by: Elias Naur <mail@eliasnaur.com>
54 lines
1.2 KiB
GLSL
54 lines
1.2 KiB
GLSL
#version 310 es
|
|
|
|
// SPDX-License-Identifier: Unlicense OR MIT
|
|
|
|
precision highp float;
|
|
|
|
layout(binding = 0) uniform Block {
|
|
vec2 scale;
|
|
vec2 offset;
|
|
vec2 pathOffset;
|
|
} uniforms;
|
|
|
|
layout(location=0) in vec2 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 + uniforms.pathOffset;
|
|
vec2 ctrl = ctrl + uniforms.pathOffset;
|
|
vec2 to = to + uniforms.pathOffset;
|
|
float maxy = maxy + uniforms.pathOffset.y;
|
|
vec2 pos;
|
|
if (corner.x > 0.0) {
|
|
// 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;
|
|
}
|
|
if (corner.y > 0.0) {
|
|
// North.
|
|
pos.y = maxy + 1.0;
|
|
} else {
|
|
// South.
|
|
pos.y = min(min(from.y, ctrl.y), to.y) - 1.0;
|
|
}
|
|
vFrom = from-pos;
|
|
vCtrl = ctrl-pos;
|
|
vTo = to-pos;
|
|
pos *= uniforms.scale;
|
|
pos += uniforms.offset;
|
|
gl_Position = vec4(pos, 1, 1);
|
|
}
|
|
|