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/*
* Copyright (C) 2024 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#version 100
attribute vec4 m_attrpos;
attribute vec4 m_attrcol;
attribute vec4 m_attrcord0;
attribute vec4 m_attrcord1;
varying vec4 m_cord0;
varying vec4 m_cord1;
varying vec4 m_colour;
uniform mat4 m_matrix;
uniform vec4 m_shaderClip;
uniform vec4 m_cordStep;
// this shader can be used in cases where clipping via glScissor() is not
// possible (e.g. when rotating). it can't discard triangles, but it may
// degenerate them.
void main()
{
// limit the vertices to the clipping area
vec4 position = m_attrpos;
position.xy = clamp(position.xy, m_shaderClip.xy, m_shaderClip.zw);
gl_Position = m_matrix * position;
// correct texture coordinates for clipped vertices
vec2 clipDist = m_attrpos.xy - position.xy;
m_cord0.xy = m_attrcord0.xy - clipDist * m_cordStep.xy;
m_cord1.xy = m_attrcord1.xy - clipDist * m_cordStep.zw;
m_colour = m_attrcol;
}
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