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// ============================================================================
//
// Program: Visualization Toolkit
// Module: vtkShadowMapPassShader_fs.glsl
//
// Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// All rights reserved.
// See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
//
// This software is distributed WITHOUT ANY WARRANTY; without even
// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
// PURPOSE. See the above copyright notice for more information.
//
// ============================================================================
// Fragment shader used by the shadow mapping render pass.
#version 110
// NOTE: this shader is concatened on the fly by vtkShadowMapPass.cxx by adding
// a line at the beginning like:
// #define VTK_LIGHTING_NUMBER_OF_LIGHTS equal to the number of shadowing
// lights.
uniform sampler2DShadow shadowMaps[VTK_LIGHTING_NUMBER_OF_LIGHTS];
uniform sampler2D spotLightShape;
varying vec4 shadowCoord[VTK_LIGHTING_NUMBER_OF_LIGHTS];
varying vec4 frontColors[VTK_LIGHTING_NUMBER_OF_LIGHTS];
void main(void)
{
gl_FragColor=vec4(0.0,0.0,0.0,0.0);
int i=0;
while(i<VTK_LIGHTING_NUMBER_OF_LIGHTS)
{
float factor=0.0;
if(shadowCoord[i].w>0.0)
{
vec2 projected=shadowCoord[i].xy/shadowCoord[i].w;
if(projected.x>=0.0 && projected.x<=1.0
&& projected.y>=0.0 && projected.y<=1.0)
{
factor=shadow2DProj(shadowMaps[i],shadowCoord[i]).x;
}
}
vec4 colorFactor=texture2DProj(spotLightShape,shadowCoord[i])*factor;
gl_FragColor+=frontColors[i]*colorFactor.x;
// gl_FragColor+=frontColors[i]*factor;
++i;
}
gl_FragColor=clamp(gl_FragColor,0.0,1.0);
// we don't let the prop to execute its fragment shader because it
// already executed in the previous pass with none shadowing lights.
// propFuncFS();
// gl_FragColor will be blending with framebuffer value containing other
// lights contributions.
// use alpha_testing for black/dark color?
}
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