77 lines
2.9 KiB
GLSL
77 lines
2.9 KiB
GLSL
// pathfinder/shaders/gles2/ecaa-curve.vs.glsl
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//
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// Copyright (c) 2017 The Pathfinder Project Developers.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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precision highp float;
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uniform vec4 uTransformST;
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uniform vec4 uHints;
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uniform ivec2 uFramebufferSize;
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uniform ivec2 uPathTransformDimensions;
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uniform ivec2 uPathBoundsDimensions;
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uniform sampler2D uPathTransform;
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uniform sampler2D uPathBounds;
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uniform vec2 uEmboldenAmount;
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attribute vec2 aQuadPosition;
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attribute vec2 aLeftPosition;
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attribute vec2 aControlPointPosition;
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attribute vec2 aRightPosition;
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attribute vec3 aNormalAngles;
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attribute float aPathID;
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varying vec4 vEndpoints;
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varying vec2 vControlPoint;
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varying float vWinding;
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void main() {
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vec2 leftPosition = aLeftPosition;
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vec2 controlPointPosition = aControlPointPosition;
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vec2 rightPosition = aRightPosition;
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int pathID = int(aPathID);
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float leftNormalAngle = aNormalAngles.x;
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float controlPointNormalAngle = aNormalAngles.y;
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float rightNormalAngle = aNormalAngles.z;
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vec4 transform = fetchFloat4Data(uPathTransform, pathID, uPathTransformDimensions);
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vec4 bounds = fetchFloat4Data(uPathBounds, pathID, uPathBoundsDimensions);
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// Transform the points, and compute the position of this vertex.
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vec2 position;
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float winding;
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if (computeECAAQuadPosition(position,
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winding,
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leftPosition,
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rightPosition,
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aQuadPosition,
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uFramebufferSize,
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transform,
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uTransformST,
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uHints,
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bounds,
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leftNormalAngle,
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rightNormalAngle,
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uEmboldenAmount)) {
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controlPointPosition = dilatePosition(controlPointPosition,
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controlPointNormalAngle,
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uEmboldenAmount);
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controlPointPosition = hintPosition(controlPointPosition, uHints);
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controlPointPosition = transformVertexPositionST(controlPointPosition, transform);
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controlPointPosition = transformVertexPositionST(controlPointPosition, uTransformST);
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controlPointPosition = convertClipToScreenSpace(controlPointPosition, uFramebufferSize);
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}
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float depth = convertPathIndexToViewportDepthValue(pathID);
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gl_Position = vec4(position, depth, 1.0);
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vEndpoints = vec4(leftPosition, rightPosition);
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vControlPoint = controlPointPosition;
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vWinding = winding;
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}
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