pathfinder/demo2/cover.vs.glsl

46 lines
1.5 KiB
GLSL

#version 300 es
// pathfinder/demo2/cover.vs.glsl
//
// Copyright © 2018 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;
uniform vec2 uFramebufferSize;
uniform vec2 uTileSize;
uniform vec2 uStencilTextureSize;
uniform sampler2D uFillColorsTexture;
uniform vec2 uFillColorsTextureSize;
uniform vec2 uViewBoxOrigin;
in vec2 aTessCoord;
in vec2 aTileOrigin;
in int aBackdrop;
in uint aObject;
out vec2 vTexCoord;
out float vBackdrop;
out vec4 vColor;
vec2 computeTileOffset(uint tileIndex, float stencilTextureWidth) {
uint tilesPerRow = uint(stencilTextureWidth / uTileSize.x);
uvec2 tileOffset = uvec2(tileIndex % tilesPerRow, tileIndex / tilesPerRow);
return vec2(tileOffset) * uTileSize;
}
void main() {
uint tileIndex = uint(gl_InstanceID);
vec2 position = (aTileOrigin + aTessCoord) * uTileSize + uViewBoxOrigin;
vec2 texCoord = computeTileOffset(tileIndex, uStencilTextureSize.x) + aTessCoord * uTileSize;
vTexCoord = texCoord / uStencilTextureSize;
vBackdrop = float(aBackdrop);
vColor = texture(uFillColorsTexture, vec2(float(aObject) / uFillColorsTextureSize.x, 0.0));
gl_Position = vec4((position / uFramebufferSize * 2.0 - 1.0) * vec2(1.0, -1.0), 0.0, 1.0);
}