mirror of https://github.com/mosra/magnum.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
98 lines
2.9 KiB
98 lines
2.9 KiB
13 years ago
|
/*
|
||
|
|
Copyright © 2010, 2011, 2012 Vladimír Vondruš <mosra@centrum.cz>
|
||
|
|
|
||
|
|
This file is part of Magnum.
|
||
|
|
|
||
|
|
Magnum is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU Lesser General Public License version 3
|
||
|
|
only, as published by the Free Software Foundation.
|
||
|
|
|
||
|
|
Magnum is distributed in the hope that it will be useful,
|
||
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
|
|
GNU Lesser General Public License version 3 for more details.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include "TextureTools/DistanceField.h"
|
||
|
|
|
||
|
|
#include <Utility/Resource.h>
|
||
|
|
#include "Math/Geometry/Rectangle.h"
|
||
|
|
#include "AbstractShaderProgram.h"
|
||
|
|
#include "Extensions.h"
|
||
|
|
#include "Framebuffer.h"
|
||
|
|
#include "Mesh.h"
|
||
|
|
#include "Shader.h"
|
||
|
|
#include "Texture.h"
|
||
|
|
|
||
|
|
namespace Magnum { namespace TextureTools {
|
||
|
|
|
||
|
|
namespace {
|
||
|
|
|
||
|
|
class DistanceFieldShader: public AbstractShaderProgram {
|
||
|
|
public:
|
||
|
|
enum: Int {
|
||
|
|
TextureLayer = 8
|
||
|
|
};
|
||
|
|
|
||
|
|
explicit DistanceFieldShader();
|
||
|
|
|
||
|
|
inline DistanceFieldShader* setRadius(Int radius) {
|
||
|
|
setUniform(radiusUniform, radius);
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
|
||
|
|
inline DistanceFieldShader* setScaling(Vector2 scaling) {
|
||
|
|
setUniform(scalingUniform, scaling);
|
||
|
|
return this;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
static const Int radiusUniform = 0,
|
||
|
|
scalingUniform = 1;
|
||
|
|
};
|
||
|
|
|
||
|
|
DistanceFieldShader::DistanceFieldShader() {
|
||
|
|
MAGNUM_ASSERT_VERSION_SUPPORTED(Version::GL330);
|
||
|
|
MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::ARB::explicit_attrib_location);
|
||
|
|
MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::ARB::explicit_uniform_location);
|
||
|
|
MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::ARB::shading_language_420pack);
|
||
|
|
|
||
|
|
/** @todo compatibility! */
|
||
|
|
|
||
|
|
Corrade::Utility::Resource rs("MagnumTextureTools");
|
||
|
|
attachShader(Shader::fromData(Version::GL330, Shader::Type::Vertex, rs.get("DistanceFieldShader.vert")));
|
||
|
|
|
||
|
|
Shader fragmentShader(Version::GL330, Shader::Type::Fragment);
|
||
|
|
fragmentShader.addSource(rs.get("compatibility.glsl"));
|
||
|
|
fragmentShader.addSource(rs.get("DistanceFieldShader.frag"));
|
||
|
|
attachShader(fragmentShader);
|
||
|
|
|
||
|
|
link();
|
||
|
|
}
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
void distanceField(Texture2D* input, Texture2D* output, const Rectanglei& rectangle, const Int radius) {
|
||
|
|
MAGNUM_ASSERT_EXTENSION_SUPPORTED(Extensions::GL::EXT::framebuffer_object);
|
||
|
|
|
||
|
|
/** @todo Disable depth test and then enable it back (if was previously) */
|
||
|
|
|
||
|
|
Framebuffer framebuffer(rectangle);
|
||
|
|
framebuffer.attachTexture2D(Framebuffer::ColorAttachment(0), output, 0);
|
||
|
|
framebuffer.bind(Framebuffer::Target::Draw);
|
||
|
|
|
||
|
|
DistanceFieldShader shader;
|
||
|
|
shader.setRadius(radius)
|
||
|
|
->setScaling(Vector2(input->imageSize(0))/rectangle.size())
|
||
|
|
->use();
|
||
|
|
|
||
|
|
input->bind(DistanceFieldShader::TextureLayer);
|
||
|
|
|
||
|
|
Mesh mesh;
|
||
|
|
mesh.setPrimitive(Mesh::Primitive::Triangles)
|
||
|
|
->setVertexCount(3)
|
||
|
|
->draw();
|
||
|
|
}
|
||
|
|
|
||
|
|
}}
|