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magnum/src/Magnum/Shaders/MeshVisualizer.geom

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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.
13 years ago
/*
This file is part of Magnum.
Updated copyright year.
7 years ago
Copyright © 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019
Happy new year too.
12 years ago
Vladimír Vondruš <mosra@centrum.cz>
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.
13 years ago
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.
*/
Shaders: `const` for readonly variables is since GLSL 4.20.
13 years ago
#ifndef RUNTIME_CONST
#define const
#endif
Shaders: ported MeshVisualizer to use geometry shaders also on ES3+AEP. Please note that in ES3 there is a behavioral change -- geometry shader is no longer explicitly disabled, but it is enabled by default and you have to disable it if you don't have the required extension or don't want to use it.
11 years ago
#ifdef GL_ES
#extension GL_EXT_geometry_shader: require
#ifdef GL_NV_shader_noperspective_interpolation
#extension GL_NV_shader_noperspective_interpolation: require
#endif
#endif
Shaders: fix MeshVisualizer without ARB_explicit_uniform_location. Bugfix by accident.
12 years ago
#ifdef EXPLICIT_UNIFORM_LOCATION
New explicit-uniform-location-is-less-explicit-than-you-hoped workaround. Intel drivers on Windows. Surprisingly unsurprising.
7 years ago
layout(location = 5)
Shaders: fix MeshVisualizer without ARB_explicit_uniform_location. Bugfix by accident.
12 years ago
#endif
Shaders: define reasonable uniform defaults for all shaders. Plus a bit of cleanup / fixing broken English.
8 years ago
uniform lowp vec2 viewportSize; /* defaults to zero */
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.
13 years ago
layout(triangles) in;
layout(triangle_strip, max_vertices = 3) out;
Shaders: ported MeshVisualizer to use geometry shaders also on ES3+AEP. Please note that in ES3 there is a behavioral change -- geometry shader is no longer explicitly disabled, but it is enabled by default and you have to disable it if you don't have the required extension or don't want to use it.
11 years ago
/* Interpolate in screen space (if possible) */
Shaders: enable noperspective in MeshVisualizer properly. This makes existing tests slightly broken, which is good (if it wouldn't, the thresholds would be too huge). Since the addition of ES3.2 geometry shaders (which broke this) happened long before there were rendering tests for shaders, this breakage wasn't caught until now. Of course proper tests would include the perspective case from the previous commit since the very beginning, but that's hard to do when you're testing long after the code was written. The test files are now RLE-encoded, which makes them significantly smaller (tho I assume Git would further compress both anyway). Not updating existing files to RLE yet to avoid repo history bloat, doing that the next time they get changed.
6 years ago
#if !defined(GL_ES) || defined(GL_NV_shader_noperspective_interpolation)
Shaders: ported MeshVisualizer to use geometry shaders also on ES3+AEP. Please note that in ES3 there is a behavioral change -- geometry shader is no longer explicitly disabled, but it is enabled by default and you have to disable it if you don't have the required extension or don't want to use it.
11 years ago
noperspective
#endif
out lowp vec3 dist;
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.
13 years ago
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 */
Shaders: ported MeshVisualizer to use geometry shaders also on ES3+AEP. Please note that in ES3 there is a behavioral change -- geometry shader is no longer explicitly disabled, but it is enabled by default and you have to disable it if you don't have the required extension or don't want to use it.
11 years ago
const vec2 v[3] = vec2[3](
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.
13 years ago
p[2]-p[1],
p[2]-p[0],
p[1]-p[0]
Shaders: ported MeshVisualizer to use geometry shaders also on ES3+AEP. Please note that in ES3 there is a behavioral change -- geometry shader is no longer explicitly disabled, but it is enabled by default and you have to disable it if you don't have the required extension or don't want to use it.
11 years ago
);
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.
13 years ago
/* 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();
}