mirror of
https://github.com/TorqueGameEngines/Torque3D.git
synced 2026-07-15 00:24:40 +00:00
52 lines
2.2 KiB
GLSL
52 lines
2.2 KiB
GLSL
//-----------------------------------------------------------------------------
|
|
// Copyright (c) 2012 GarageGames, LLC
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to
|
|
// deal in the Software without restriction, including without limitation the
|
|
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
|
|
// sell copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in
|
|
// all copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
|
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
|
|
// IN THE SOFTWARE.
|
|
//-----------------------------------------------------------------------------
|
|
|
|
|
|
float calcBlend( float texId, vec2 layerCoord, float layerSize, vec4 layerSample )
|
|
{
|
|
// This is here to disable the blend if none of
|
|
// the neighbors equal the current id.
|
|
//
|
|
// We depend on the input layer samples being
|
|
// rounded to the correct integer ids.
|
|
//
|
|
vec4 diff = clamp( abs( layerSample - texId ), 0.0, 1.0 );
|
|
float noBlend = float(any( bvec4(1 - diff) ));
|
|
|
|
// Check if any of the layer samples
|
|
// match the current texture id.
|
|
vec4 factors = vec4(0);
|
|
for(int i = 0; i < 4; i++)
|
|
factors[i] = (layerSample[i] == texId) ? 1 : 0; // workaround for Intel
|
|
|
|
// This is a custom bilinear filter.
|
|
|
|
vec2 uv = layerCoord * layerSize;
|
|
vec2 xy = floor( uv );
|
|
vec2 ratio = uv - xy;
|
|
vec2 opposite = 1 - ratio;
|
|
|
|
float blend = ( factors.b * opposite.x + factors.g * ratio.x ) * opposite.y +
|
|
( factors.r * opposite.x + factors.a * ratio.x ) * ratio.y;
|
|
|
|
return noBlend * blend;
|
|
}
|