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Shaders: added first version of MeshVisualizer shader. 

Rudely written to work only with fairly recent extensions and nothing
less than GLSL 3.30. It requires geometry shaders for wireframe
rendering, without it it behaves the same as Shaders::Flat.
pull/278/head
Vladimír Vondruš 13 years ago
parent
0804106f62
commit
173c2a8190
7 changed files with 353 additions and 0 deletions
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  1. 3
      src/Shaders/CMakeLists.txt
  2. 59
      src/Shaders/MeshVisualizer.cpp
  3. 46
      src/Shaders/MeshVisualizer.frag
  4. 59
      src/Shaders/MeshVisualizer.geom
  5. 154
      src/Shaders/MeshVisualizer.h
  6. 31
      src/Shaders/MeshVisualizer.vert
  7. 1
      src/Shaders/Shaders.h

3
src/Shaders/CMakeLists.txt
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@ -25,6 +25,7 @@
corrade_add_resource(MagnumShaders_RCS MagnumShaders
AbstractVector2D.vert AbstractVector3D.vert
Flat2D.vert Flat3D.vert Flat.frag
MeshVisualizer.vert MeshVisualizer.geom MeshVisualizer.frag
Phong.vert Phong.frag
Vector.frag DistanceFieldVector.frag
VertexColor2D.vert VertexColor3D.vert VertexColor.frag
@ -33,6 +34,7 @@ corrade_add_resource(MagnumShaders_RCS MagnumShaders
set(MagnumShaders_SRCS
DistanceFieldVector.cpp
Flat.cpp
MeshVisualizer.cpp
Phong.cpp
Vector.cpp
VertexColor.cpp
@ -42,6 +44,7 @@ set(MagnumShaders_HEADERS
DistanceFieldVector.h
AbstractVector.h
Flat.h
MeshVisualizer.h
Phong.h
Shaders.h
Vector.h

59
src/Shaders/MeshVisualizer.cpp
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@ -0,0 +1,59 @@
/*
This file is part of Magnum.
Copyright © 2010, 2011, 2012, 2013 Vladimír Vondruš <mosra@centrum.cz>
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.
*/
#include "MeshVisualizer.h"
#include <Utility/Resource.h>
#include "Context.h"
#include "Extensions.h"
#include "Shader.h"
namespace Magnum { namespace Shaders {
MeshVisualizer::MeshVisualizer(const Flags flags): flags(flags), transformationProjectionMatrixUniform(0), viewportSizeUniform(1), colorUniform(2), wireframeColorUniform(3), wireframeWidthUniform(4), smoothnessUniform(5) {
if(flags & Flag::Wireframe) MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::ARB::geometry_shader4);
MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::ARB::explicit_attrib_location);
MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::ARB::explicit_uniform_location);
Corrade::Utility::Resource rs("MagnumShaders");
attachShader(Shader(Version::GL330, Shader::Type::Vertex)
.addSource(flags & Flag::Wireframe ? "#define WIREFRAME_RENDERING\n" : "")
.addSource(rs.get("compatibility.glsl"))
.addSource(rs.get("MeshVisualizer.vert")));
if(flags & Flag::Wireframe) attachShader(Shader(Version::GL330, Shader::Type::Geometry)
.addSource(rs.get("compatibility.glsl"))
.addSource(rs.get("MeshVisualizer.geom")));
attachShader(Shader(Version::GL330, Shader::Type::Fragment)
.addSource(flags & Flag::Wireframe ? "#define WIREFRAME_RENDERING\n" : "")
.addSource(rs.get("compatibility.glsl"))
.addSource(rs.get("MeshVisualizer.frag")));
link();
}
}}

46
src/Shaders/MeshVisualizer.frag
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@ -0,0 +1,46 @@
/*
This file is part of Magnum.
Copyright © 2010, 2011, 2012, 2013 Vladimír Vondruš <mosra@centrum.cz>
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.
*/
layout(location = 2) uniform vec4 color = vec4(1.0, 1.0, 1.0, 1.0);
#ifdef WIREFRAME_RENDERING
layout(location = 3) uniform vec4 wireframeColor = vec4(0.0, 0.0, 0.0, 1.0);
layout(location = 4) uniform float wireframeWidth = 1.0;
layout(location = 5) uniform float smoothness = 2.0;
noperspective in vec3 dist;
#endif
out vec4 fragmentColor;
void main() {
#ifdef WIREFRAME_RENDERING
/* Distance to nearest side */
const float nearest = min(min(dist.x, dist.y), dist.z);
/* Smooth step between face color and wireframe color based on distance */
fragmentColor = mix(wireframeColor, color, smoothstep(wireframeWidth-smoothness, wireframeWidth+smoothness, nearest));
#else
fragmentColor = color;
#endif
}

59
src/Shaders/MeshVisualizer.geom
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@ -0,0 +1,59 @@
/*
This file is part of Magnum.
Copyright © 2010, 2011, 2012, 2013 Vladimír Vondruš <mosra@centrum.cz>
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.
*/
layout(location = 1) uniform vec2 viewportSize;
layout(triangles) in;
layout(triangle_strip, max_vertices = 3) out;
/* Interpolate in screen space */
noperspective out vec3 dist;
void main() {
/* Screen position of each vertex */
vec2 p[3];
for(int i = 0; i != 3; ++i)
p[i] = viewportSize*gl_in[i].gl_Position.xy/gl_in[i].gl_Position.w;
/* Vector of each triangle side */
const vec2 v[3] = {
p[2]-p[1],
p[2]-p[0],
p[1]-p[0]
};
/* Compute area using perp-dot product */
const float area = abs(dot(vec2(-v[1].y, v[1].x), v[2]));
/* Add distance to opposite side to each vertex */
for(int i = 0; i != 3; ++i) {
dist = vec3(0.0, 0.0, 0.0);
dist[i] = area/length(v[i]);
gl_Position = gl_in[i].gl_Position;
EmitVertex();
}
EndPrimitive();
}

154
src/Shaders/MeshVisualizer.h
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@ -0,0 +1,154 @@
#ifndef Magnum_Shaders_MeshVisualizer_h
#define Magnum_Shaders_MeshVisualizer_h
/*
This file is part of Magnum.
Copyright © 2010, 2011, 2012, 2013 Vladimír Vondruš <mosra@centrum.cz>
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.
*/
/** @file
* @brief Class Magnum::Shaders::MeshVisualizer
*/
#include "Math/Matrix4.h"
#include "AbstractShaderProgram.h"
#include "Color.h"
#include "Shaders/magnumShadersVisibility.h"
namespace Magnum { namespace Shaders {
/**
@brief %Mesh visualization shader
Uses geometry shader to visualize wireframe. You need to call at least
setTransformationProjectionMatrix() (and setViewportSize(), if
@ref Flag "Flag::Wireframe" is enabled) to be able to render.
@requires_gl32 %Extension @extension{ARB,geometry_shader4} if
@ref Magnum::Shaders::MeshVisualizer::Flag "Flag::Wireframe" is enabled.
*/
class MAGNUM_SHADERS_EXPORT MeshVisualizer: public AbstractShaderProgram {
public:
typedef Attribute<0, Vector3> Position; /**< @brief Vertex position */
/**
* @brief %Flag
*
* @see Flags, MeshVisualizer()
*/
enum class Flag: UnsignedByte {
Wireframe = 1 << 0 /**< Visualize wireframe */
};
/** @brief %Flags */
typedef Corrade::Containers::EnumSet<Flag, UnsignedByte> Flags;
/**
* @brief Constructor
* @param flags %Flags
*/
explicit MeshVisualizer(Flags flags);
/**
* @brief Set transformation and projection matrix
* @return Pointer to self (for method chaining)
*/
inline MeshVisualizer* setTransformationProjectionMatrix(const Matrix4& matrix) {
setUniform(transformationProjectionMatrixUniform, matrix);
return this;
}
/**
* @brief Set viewport size
* @return Pointer to self (for method chaining)
*
* Has effect only if @ref Flag "Flag::Wireframe" is enabled.
*/
inline MeshVisualizer* setViewportSize(const Vector2& size) {
setUniform(viewportSizeUniform, size);
return this;
}
/**
* @brief Set base object color
* @return Pointer to self (for method chaining)
*
* Initial value is fully opaque white.
*/
inline MeshVisualizer* setColor(const Color4<>& color) {
setUniform(colorUniform, color);
return this;
}
/**
* @brief Set wireframe color
* @return Pointer to self (for method chaining)
*
* Initial value is fully opaque black. Has effect only if
* @ref Flag "Flag::Wireframe" is enabled.
*/
inline MeshVisualizer* setWireframeColor(const Color4<>& color) {
if(flags & Flag::Wireframe) setUniform(wireframeColorUniform, color);
return this;
}
/**
* @brief Set wireframe width
* @return Pointer to self (for method chaining)
*
* Initial value is `1.0f`. Has effect only if
* @ref Flag "Flag::Wireframe" is enabled.
*/
inline MeshVisualizer* setWireframeWidth(Float width) {
if(flags & Flag::Wireframe) setUniform(wireframeWidthUniform, width);
return this;
}
/**
* @brief Set line smoothness
* @return Pointer to self (for method chaining)
*
* Initial value is `2.0f`. Has effect only if
* @ref Flag "Flag::Wireframe" is enabled.
*/
MeshVisualizer* setSmoothness(Float smoothness);
private:
Flags flags;
Int transformationProjectionMatrixUniform,
viewportSizeUniform,
colorUniform,
wireframeColorUniform,
wireframeWidthUniform,
smoothnessUniform;
};
CORRADE_ENUMSET_OPERATORS(MeshVisualizer::Flags)
inline MeshVisualizer* MeshVisualizer::setSmoothness(Float smoothness) {
if(flags & Flag::Wireframe)
setUniform(smoothnessUniform, smoothness);
return this;
}
}}
#endif

31
src/Shaders/MeshVisualizer.vert
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@ -0,0 +1,31 @@
/*
This file is part of Magnum.
Copyright © 2010, 2011, 2012, 2013 Vladimír Vondruš <mosra@centrum.cz>
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.
*/
layout(location = 0) uniform mat4 transformationProjectionMatrix;
layout(location = 0) in vec4 position;
void main() {
gl_Position = transformationProjectionMatrix*position;
}

1
src/Shaders/Shaders.h
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@ -47,6 +47,7 @@ template<UnsignedInt> class Flat;
typedef Flat<2> Flat2D;
typedef Flat<3> Flat3D;
class MeshVisualizer;
class Phong;
template<UnsignedInt> class Vector;

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