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cull-raster.geo.glsl
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cull-raster.geo.glsl
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#version 430
/**/
#ifndef MATRIX_WORLD
#define MATRIX_WORLD 0
#endif
#ifndef MATRIX_WORLD_IT
#define MATRIX_WORLD_IT 1
#endif
#ifndef MATRICES
#define MATRICES 2
#endif
#ifndef FLIPWIND
#define FLIPWIND 1
#endif
#ifndef PERSPECTIVE
#define PERSPECTIVE 1
#endif
// render the 3 visible sides based on view direction and box normal
layout(points,invocations=3) in;
// one side each invocation
layout(triangle_strip,max_vertices=4) out;
in VertexOut{
vec3 bboxCtr;
vec3 bboxDim;
flat int matrixIndex;
flat int objid;
} IN[1];
flat out int objid;
uniform vec3 viewPos;
uniform vec3 viewDir;
uniform mat4 viewProjTM;
uniform samplerBuffer matricesTex;
void main()
{
int matindex = (IN[0].matrixIndex*MATRICES + MATRIX_WORLD)*4;
mat4 worldTM = mat4(
texelFetch(matricesTex,matindex + 0),
texelFetch(matricesTex,matindex + 1),
texelFetch(matricesTex,matindex + 2),
texelFetch(matricesTex,matindex + 3));
vec3 faceNormal = vec3(0);
vec3 edgeBasis0 = vec3(0);
vec3 edgeBasis1 = vec3(0);
int id = gl_InvocationID;
if (id == 0)
{
faceNormal.x = IN[0].bboxDim.x;
edgeBasis0.y = IN[0].bboxDim.y;
edgeBasis1.z = IN[0].bboxDim.z;
}
else if(id == 1)
{
faceNormal.y = IN[0].bboxDim.y;
edgeBasis1.x = IN[0].bboxDim.x;
edgeBasis0.z = IN[0].bboxDim.z;
}
else if(id == 2)
{
faceNormal.z = IN[0].bboxDim.z;
edgeBasis0.x = IN[0].bboxDim.x;
edgeBasis1.y = IN[0].bboxDim.y;
}
vec3 worldCtr = (worldTM * vec4(IN[0].bboxCtr, 1)).xyz;
#if PERSPECTIVE
vec3 worldNormal = mat3(worldTM) * faceNormal;
vec3 worldPos = worldCtr + worldNormal;
float proj = sign(dot(worldPos - viewPos.xyz, worldNormal));
#else
vec3 worldNormal = mat3(worldTM) * faceNormal;
float proj = sign(dot(viewDir,worldNormal));
#endif
#if FLIPWIND
proj *= -1;
#endif
faceNormal = mat3(worldTM) * (faceNormal) * proj;
edgeBasis0 = mat3(worldTM) * (edgeBasis0);
edgeBasis1 = mat3(worldTM) * (edgeBasis1) * proj;
objid = IN[0].objid;
#if FLIPWIND
gl_Position = viewProjTM * vec4(worldCtr + (faceNormal - edgeBasis0 - edgeBasis1),1);
EmitVertex();
gl_Position = viewProjTM * vec4(worldCtr + (faceNormal + edgeBasis0 - edgeBasis1),1);
EmitVertex();
gl_Position = viewProjTM * vec4(worldCtr + (faceNormal - edgeBasis0 + edgeBasis1),1);
EmitVertex();
gl_Position = viewProjTM * vec4(worldCtr + (faceNormal + edgeBasis0 + edgeBasis1),1);
EmitVertex();
#else
gl_Position = viewProjTM * vec4(worldCtr + (faceNormal - edgeBasis0 - edgeBasis1),1);
EmitVertex();
gl_Position = viewProjTM * vec4(worldCtr + (faceNormal - edgeBasis0 + edgeBasis1),1);
EmitVertex();
gl_Position = viewProjTM * vec4(worldCtr + (faceNormal + edgeBasis0 - edgeBasis1),1);
EmitVertex();
gl_Position = viewProjTM * vec4(worldCtr + (faceNormal + edgeBasis0 + edgeBasis1),1);
EmitVertex();
#endif
}
/*-----------------------------------------------------------------------
Copyright (c) 2014, NVIDIA. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Neither the name of its contributors may be used to endorse
or promote products derived from this software without specific
prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-----------------------------------------------------------------------*/